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By: dranjanapankaj (48 month(s) ago)

Excellent presentations. How to download for teaching purposes?

By: dranjanapankaj (48 month(s) ago)

Excellent presentations

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Slide 1: 

Minimally Invasive Surgery

Slide 2: 

Laparoscopy Defined: Laparoscopy is a procedure that allows a surgeon to view and perform surgery on the organs and tissue of the abdomen. It is performed through small incisions in the abdomen using specialized instruments and viewed on a TV monitor. Also known as “minimal invasive surgery”

The Pioneers : 

The Pioneers The great physician, Hippocrates of Ancient Greece( circa 460-377 BC) made the original reference to a speculum to examine the rectum.

HISTORY : 

HISTORY The earliest recorded references to endoscopy date to ancient times with Hippocrates. In his description there is explanation of rectum examination with a speculum. Hippocrates also advised injecting a large quantity of air into the intestines through the anus in the case of intestinal obstruction.

Slide 5: 

Hippocrates also advocated the insertion of suppository that was 10 digits long. These descriptions suggest that Hippocrates was well aware of ileus with intestinal obstruction and thought that there were several possible etiologies, including faecal impaction, intussusceptions, and sigmoid volvulus. Moreover, Hippocrates treated these life-threatening conditions with minimally invasive approaches

Slide 6: 

1585, Aranzi was the first to use a light source for an endoscopic procedure, focusing sunlight through a flask of water and projecting the light into the nasal cavity 1706, The term “trocar,” was coined in 1706, and is thought to be derived from trochartor troise-quarts, a three-faced instrument consisting of a perforator enclosed in a metal cannula. 1806, Philip Bozzini, built an instrument that could be introduced in the human body to visualize the internal organs. He called this instrument "LICHTLEITER". Bozzini used an aluminium tube to visualize the genitourinary tract. The tube, illuminated by a wax candle, had fitted mirrors to reflect images.

Slide 7: 

1853, Antoine Jean Desormeaux, a French surgeon first introduced the 'Lichtleiter" of Bozzini to a patient. For many surgeons he is considered as the "Father of Endoscopy". 1867, Desormeaux, used an open tube to examine the genitourinary tract, combining alcohol and turpentine with a flame in order to generate a brighter, more condensable beam of light. 1868, Kussmaul performed the first esophagogastroscopy on a professional sword swallower, initiating efforts at instrumentation of the gastrointestinal tract. Mikulicz and Schindler, however, are credited with the advancement of gastroscopy

Slide 8: 

1869, Commander Pantaleoni used a modified cystoscope to cauterize a hemorrhagic uterine growth. Pantaleoni thus performed the first diagnostic and therapeutic hysteroscopy 1901, Dimitri Ott, a Petrograd gynecologist wore head mirrors to reflect light and augment visualization and used access technique in which a speculum was introduced through an incision in the prior fornix in a pregnant woman.

Slide 9: 

1901, The first experimental laparoscopy was performed in Berlin in 1901 by German surgeon Georg Kelling, who used a cystoscope to peer into the abdomen of a dog after first insufflating it with air. Kelling also used filtered atmospheric air to create a pneumoperitoneum, with the goal of stopping intra-abdominal bleeding (Ectopic pregnancy, bleeding ulcers, and pancreatitis) but these studies did not find any response or supporters. Kelling proposed a high-pressure insufflation of the abdominal cavity, a technique he called the "Luft-tamponade" or "air-tamponade".

The Pioneers 5 : 

The Pioneers 5 Jacobaeus of Sweden presented his series of patients who had laparoscopy in 1910 (published a series of over 100 laparoscopy and thoracoscopy(LAPAROSCOPY).

Slide 11: 

1911,  Bertram M. Bernheim, from Johns Hopkins Hospital introduced first laparoscopic surgery to the United States. He named the procedure of minimal access surgery as "organoscopy". The instrument used was a proctoscope of a half inch diameter and ordinary light for illumination was used. 1911, H.C. Jacobaeus, again coined the term "laparothorakoskopie" after using this procedure on the thorax and abdomen.  He used to introduce the trocar inside the body cavity directly without employing a pneumoperitoneum.

Slide 12: 

1918, O. Goetze, developed an automatic pneumoperitoneum needle characterized for its safe introduction to the peritoneal cavity. The next decade and a half saw an interruption of technological advances and a lack of any substantial development in endoscopy due to World War I. 1920, Zollikofer of Switzerland discovered the benefit of CO2 gas to use for insufflation, rather than filtered atmospheric air or nitrogen. 1929, Kalk, a German physician, introduced the forward oblique (135 degree) view lens systems. He advocated the use of a separate puncture site for pneumoperitoneum. Goetze of Germany first developed a needle for insufflations.

Slide 13: 

1929, Heinz Kalk, a German gastroenterologist developed a 135 degree lens system and a dual trocar approach. He used laparoscopy as a diagnostic method for liver and gallbladder disease. 1934,  John C. Ruddock, an American surgeon described laparoscopy as a good diagnostic method, many times, superior than laparotomy.  John C. Ruddock used the instrument for diagnostic laparoscopy which consisted a built-in forceps with electro coagulation capacity.

Slide 14: 

1936, Boesch of Switzerland is credited for doing the first laparoscopic tubal sterilization 1938, Janos Veress of Hungary developed a specially designed spring-loaded needle. Interestingly, Veress did not promote the use of his Veress needle for laparoscopy purposes. He used veress needle for the induction of pneumothorax. Veress needle is the most important instrument today to create pneumo-peritoneum. Veress needle consists of an outer cannula with a beveled needle point for cutting through tissues. Inside the cannula of verses needle is an inner stylet, stylet is loaded with a spring that spring forward in response to the sudden decrease in pressure encountered upon crossing the abdominal wall and entering the peritoneal cavity.

Slide 15: 

1939, Richard W. Telinde, tried to perform an endoscopic procedure by a culdoscopic approach, in the lithotomy position. This method was rapidly abandoned because of the presence of small intestine. 1939, Heinz Kalk published his experience of 2000 liver biopsies performed using local anaesthesia without mortality. 1944, Raoul Palmer, of Paris performed gynaecological examinations using laparoscopy and placing the patients in the Trendelenberg position, so air could fill the pelvis. He also stressed the importance of continuous intra-abdominal pressure monitoring during a laparoscopic procedure.

Slide 16: 

1953, The rigid rod lens system was discovered by Professor Hopkins. The credit of videoscopic surgery goes to this surgeon who has revolutionized the concept by making this instrument. 1960, Kurt Semm, a German gynaecologist, who invented the automatic insufflator. His experience with this new device was published in 1966. Although not recognized in his own land, on the other side of the Atlantic, both American physicians and instrument makers valued the Semm’s insufflator for its simple application, clinical value, and safety.

Slide 17: 

1966, Kurt Semm introduced an automatic insufflation device capable of monitoring intra-abdominal pressures. This reduced the dangers associated with insufflation of the abdomen and allowed safer laparoscopy. 1970, Gynaecologists had embraced laparoscopy and thoroughly incorporated the technique into their practice. General surgeons, despite their exposure to laparoscopy remained confined to traditional open surgery.

Slide 18: 

1972, H.Coutnay Clarke first time showed laparoscopic suturing technique for hemostasis. 1973, Gaylord D. Alexander developed techniques of safe local and general anaesthesia sitable for laparoscopy. 1977, First Laparoscopic assisted appendicectomy was performed by Dekok. Appendix was exteriorized and ligated outside. 1977, Kurt Semm first time demonstrated endoloop suturing technique in laparoscopic surgery.

Slide 19: 

1978, Hasson introduced an alternative method of trocar placement. He proposed a blunt mini-laparotomy which permits direct visualization of trocar entrance into the peritoneal cavity. A reusable device of similar design to a standard cannula but attached to an olive-shaped sleeve was developed by Hasson. This sleeve would slide up and down the shaft of the cannula and would form an airtight seal at the fascial opening. In addition, the sharp trocar was replaced by a blunt obturator. This cannula is held in place by the use of stay sutures passed through the fascial edges and attached to the body of the cannula. .

Slide 20: 

1980, In United Kingdom Patrick Steptoe, started to perform laparoscopic procedures. 1983, Semm, a German gynaecologist, performed the first laparoscopic appendicectomy

Slide 21: 

1985, The first documented laparoscopic cholecystectomy was performed by Erich Mühe in Germany in 1985.  1987, Ger reported first laparoscopic repair of inguinal hernia using prototype stapeler. 1987, Phillipe Mouret, has got the credit to perform the first laparoscopic cholecystectomy in Lyons, France using video technique. Cholecystectomy is the laparoscopic procedure which revolutionized the general surgery. 1988, Harry Reich performed laparoscopic lymphadenectomy for treatment of ovarian cancer.

Slide 22: 

1989, Harry Reich described first laparoscopic hysterectomy using bipolar dessication; later he demonstrated staples and finally sutures for laparoscopic hysterectomy. 1989, Reddick and Olsen reported that CBD injury after laparoscopic cholecystectomy is 5 times that with conventional cholecystectomy. As a result of this report USA government announced that surgeons should do at least 15 laparoscopic cholecystectomy under supervision before being allowed to do this procedure on their own.

Slide 23: 

1990, Bailey and Zucker in USA popularized laparoscopic anterior highly selective vagotomy combined with posterior truncal vagotomy. 1994, A robotic arm was designed to hold the telescope with the goal of improving safety and reducing the need of skilled camera operator. 1996, First live telecast of laparoscopic surgery performed remotely via the Internet

Slide 24: 

Many surgeons says "Laparoscopy is the by product of medical engineering". Laparoscopy was initially criticized due to the cost of instruments and possible complications due to these sharp long instruments and difficult hand eye co-ordination. Many senior surgeon started saying "Laparoscopy is conspiracy against common man".  Minimal access surgery has developed rapidly only after grand success of laparoscopic cholecystectomy. Recently computerized designing of laparoscopic instrument is introduced and microprocessor controlled safety features are added. Now it is impossible to stop the speed of growth of minimal access surgery and every day new procedures are added on its list. Laparoscopy is a technologically dependent surgery and before starting surgery every surgeon should have reasonably good knowledge of these instruments.

Slide 25: 

Tower Set up TV Monitor Insufflator Camera Printer Light source DVD player

Slide 27: 

The mobile video cart is equipped with locking brakes and has 4 anti-static rollers. The trolley has a drawer and three shelves, the upper shelves have a tilt adjustment and used for supporting the video monitor unit. Included on the trolley is an electrical supply terminal strip, mounted on the rear of the 2nd shelf (from the top). Recently ceiling mounted trolleys are launched by many companies which is ergonomically better and consume less space in operation theatre.

Slide 28: 

Light cable and light source Light is essential for performing most of the modus operandi of life. Thanks to Edison who discovered electric bulb. The Minimal access surgery depends on the artificial light available in closed body cavity, and before the discovery of light source and light cable; mirrors were used to reflect the light onto the subject where the direct light access was not possible. In 1867 Bruck, a Dentist from Breslau, made a platinum wire loop which he heated with electric current, and used that as a light source for purpose of surgery. Endoscopy was performed, by using tungsten light bulbs inside the body cavity before 1954. These bulbs were emitting low frequency red color of light. The bulb was so hot that there was always a risk of injury to bowel.

Slide 29: 

Fibre Optic Cables: In 1954 a major breakthrough in technology occurred in the development of fibre optic cables. The principle of fibre optic cable was based on the total internal reflection of light. Light can be conducted along a curved glass rod due to multiple total internal reflections at the walls of the rod. Light would enter at one end of the fibre and emerge at the other end after numerous internal reflections with virtually all of its strength. Nowadays there are two types of light cable available in market. 1.  Fiber Optic cable 2.  Liquid crystal Gel cable

Slide 31: 

Attachment of Light Source: DIC Attachment Conventional attachment has at right angle connection for light source and camera. Recently some new attachment for light cable is available known as DIC Interface. The benefit of this is that it maintains upright orientation regardless of angle of viewing, using auto Rotation system. It also provides single handed control of the entire endoscope camera system. Maintenance of light cable: 1.    Handle them carefully, 2.   Avoid twisting them 3.   After the operation has been completed, the cable should preferably be disconnected from the endoscope and then connected to the light source. In fact, most of the sources currently available have a plug for holding the cable until it cools down. 4.   The intensity of light source is so high that there is chance of retinal damage if the light will fall directly on eye so never try to look directly on light source when it is lighted.

Slide 32: 

5.   The end of the end crystal of cable should be periodically cleaned with a cotton swab moistened with alcohol. 6.   The outer plastic covering of the cable should be cleaned with a mild cleaning agent or disinfectant. 7.   Distal end of fiber optic cable should never be placed on or under drapes, or next to the patient, if it is connected to an illuminated light source. The heat generated from the intensity of light may cause burns to the patient or ignite the drapes.

Slide 34: 

Diathermy Machine Diathermy involves the passage of high frequency alternating current through body tissue. This can be connected to laparoscopic instruments to help the surgeon with dissecting of tissue and the sealing of blood vessels. Helps maintain hemostasis (stoppage of bleeding).

Slide 35: 

The light source: One of the advantages of the laparoscopy is that of obtaining a virtually micro-surgical view compared to that obtained by laparotomy. Quality of the image obtained very much depends on the quantity of light available at each step of optical and electronic system. A typical light source is consist of ·        A lamp ·        A heat filter ·        A condensing lens and ·        Manual or automatic intensity control circuit.

Slide 36: 

Lamp: Lamp or bulb is the most important part of the light source. The Quality of light depends on the lamp used. Several Modern types of light sources are currently available on the market. These light sources mainly differ on the type of bulb used. Four types of lamp are used more recently. 1.    Quartz halogen. 2.    Incandescent bulbs. 3.    Xenon and 4.    Metal halide vapor arc lamp.

Slide 37: 

Halogen bulbs Halogen bulbs provide a highly efficient, almost crisp white light source with excellent color rendering. Electrodes in halogen lamps are made of tungsten; this is the only metal with a sufficiently high melting temperature and sufficient vapor pressure at elevated temperatures. They use a halogen gas that allows bulbs to burn more intensely without sacrificing life. Halogen bulbs are low voltage and have an average life of 2,000 hours. Color temperature of Halogen lamp is (5000-5600 K). These lamps are cheap and can be used for laparoscopic surgery if low budget setup is required

Slide 38: 

Xenon lamps Xenon lamps consist of a spherical or ellipsoidal envelope made of quartz glass, which can withstand high thermal loads and high internal pressure. For ultimate image quality, only the highest-grade clear fused silica quartz is used. It is typically doped, although not visible to the human eye, to absorb harmful UV radiation generated during operation. The colour temperature of Xenon lamp is 6000-6400 K. The operating pressures are tens of atmospheres at times, with surface temperatures exceeding 600 degrees C.

Slide 39: 

The most frequently used two main types of lamps are halogen and xenon. This difference may be remarked in the colors obtained, the xenon having a slightly bluish tint. The light emitted by xenon lamp is more natural compared to halogen lamp. However, most of the cameras at present analyze and compensate these variations by means of automatic equalization of whites (2100 K to 10000 K), which allows the same image to be obtained with both light sources. A proper white balancing before start of the operation is a very good practice for obtaining a natural color. The white light is composed of the equal proportion of Red, Blue and Green Color and at the time of white balancing the camera sets its digital coding for these primary colors to equal proportion assuming that the target is white. And if at the time of white balancing the telescope is not seeing a perfectly white object then the setup of the camera will be very bad and the color perception will be very poor The newer light source of Xenon, now a day used is defined as a cool light but practically it is not completely heat free and it should be cared for ignition hazard

Slide 40: 

Heat Filter For 100 % of energy consumed, a normal light source (a light bulb) uses approximately 2 % in light and 98 % in heat. This heat is mainly due to the infrared spectrum of light and due to obstruction in the pathway of light. If Infrared will travel through the light cable than the cable will become intolerable hot. A heat filter is introduced to filter this infrared to travel in fibre optic cable. A cool light source lowers this ratio by creating more light, but does not reduce the heat produced to zero. This implies a significant dissipation of heat, which increases as the power rating increases. The sources are protected against transmitting too much heat at present. The heat is essentially dissipated in transport, along the cable, in the connection with the endoscope and along the endoscope. Some accidents have been reported due to burning caused by the heat of the optics system. It is therefore important to test the equipment, particularly if assemblies of different brands are used.

Slide 41: 

A condensing lens The purpose of condensing lens is to converge the light emitted by lamp to the area of light cable input. In most of the light source it is used for increasing the light intensity per square cm of area.

Slide 42: 

Telescope There are three important structural differences in telescope available in the market. 1.      6 to 18 rod lens system telescopes are available 2.      0 to 120 degree telescopes are available 3.      1.5 mm to 15 mm of telescopes are available .

Slide 43: 

Normally used telescope is the Hopkins Forward Oblique Telescope 30°, diameter 10mm length 33cm, and is autoclavable. At the distal end is a front lens complex (inverting real-image lens system, IRILS) which creates an inverted and real image of the subject. A number of IRILS transport the image to the eyepiece containing a magnifying lens. In the Hopkins rod-lens system light is transmitted through glass columns and refracted through intervening air lenses. The 30 forward oblique permits far greater latitude for viewing underlying areas under difficult anatomical conditions. One of the major limitations of minimal access surgery is the loss of depth perception. The surgeon works with an artificial two dimensional video pictures available on the monitor. There is a need to develop some mechanism to improve depth perception or stereoscopic vision

Slide 45: 

Laparoscopic Video monitor Surgical monitors are no different from the T.V. We watch at home. The basic principle of image reproduction is horizontal beam scanning on the face of the picture tube. This plate is coated internally with a fluorescent substance containing phosphor. This generates electrons when struck by beams from the electron gun. As the beam sweeps horizontally and back it covers all the picture elements before reaching its original position. This occurs repetitively and rapidly. This method is called 'horizontal linear scanning'. Each picture frame consists of several such lines depending on the type of system used.

Slide 46: 

Laparoscopic Camera Laparoscopic camera is one of the very important instruments and should be of good quality. Laparoscopic camera today's available is either of single chip or three chip.  We all know that there are three primary colour (Red, Blue and Green). All the colours are mixture of these three primary colour in different proportion. In single chip camera all these 3 primary colour is sensed by single chip. In three chip camera there are 3 CCD- Chips for separate capture and processing of 3 primary colour. These 3 chip camera has unprecedented colour reproduction and highest degree of fidelity. Three chip camera has high horizontal image resolution of more than 750 lines.

Slide 47: 

Focusing of laparoscopic camera Laparoscopic camera need to be focused before inserting inside the abdominal cavity. At the time of focusing it should be placed at a distance of approximately 5 cm away from the target. 5 cm distance is optimum for focusing because at the time of laparoscopic surgery most of the time we keep the telescope at this distance. .

Slide 48: 

White balancing of camera White balancing should be performed before inserting camera inside the abdominal cavity. White balancing is necessary everytime before start of surgery because every time there is some addred impurities of colour due to following variables Difference in voltage Different cleaning material used to clean the tip of telescope which can stain the tip Scratches wear and tear of the telescopes eye piece, Object piece and CCD of camera When we do white balancing by keeping any white object infront of telescope attached with camera camera senses that white object as reference and adjust its all primary colour (Red, Blue and Green) to make a pure natural white colour

Slide 49: 

Laproflattor Patient safety is ensured by optical and acoustic alarms as well as several mutually independent safety circuits. The detail function and quadro-manometric indicators of insufflator is important to understand safety point of view. The important indicators of insufflators are preset pressure, actual pressure, flow rate and total gas used.

Slide 50: 

Laparoscopic Suction Irrigation Machine It is used for flushing the abdominal cavity and cleaning during endoscopic operative intrusions. It has been designed for use with the 26173 AR suction /instillation tube. Its electrically driven pressure/suction pump is protected against entry of bodily secretions. The suction irrigation machine is used frequently at the time of laparoscopy to make the field of vision clear. Most of the surgeons use normal saline or ringer lactate for irrigation purposes. Sometime heparinized saline is used to dissolve blood clot to facilitate proper suction in case of excessive intra-abdominal bleeding.

Disposable or Reusable Instrument : 

Disposable or Reusable Instrument Disposable or Reusable Instrument Several factors should be considered at the time of choosing laparoscopic instrument, including cost, availability and reliability. Reusable instruments are expensive initially but in long rum they are cost effective. The disposable instrument cost is less compared to re-usable but patient cost is increased. In many centers re-use of disposable instrument is seen. In developing countries, disposable instruments are very rarely used because labour cost is low compare to the cost of disposable instrument. In Europe and USA, surgeons often choose to use disposable instrument in order to save high labour cost..

Slide 52: 

The main advantage of disposable instrument is high performance due to its sharpness and reduced chance of disease transmission due to certified high-end factory sterilization. However, once discarded, environment concerns are raised about disposal and biodegrability of disposable instruments. Ideally disposable instrument should not be used repeatedly because handling, sorting, storing and sterilization make these instrument questionable. The disposable instruments are not sterilized properly by dipping in gluteraldehyde because they are not dismountable. Insulation of disposable instrument also can be torn easily which can lead to electrosurgical injuries

Slide 53: 

Veress Needle Veress needle was invented by a chest physician for aspiration of pleural effusion keeping in mind that its spring mechanism and blunt tip will prevent the injury of lung tissue. Veress needle consists of an outer cannula with a beveled needle point for cutting through tissues. Inside the cannula is an inner stylet, which is loaded with a spring that spring forward in response to the sudden decrease in pressure encountered upon crossing the abdominal wall and entering the peritoneal cavity. The lateral hole on this stylet enables CO2 gas to be delivered intra-abdominally. .

Slide 54: 

Veress needle is used for creating initial pneumoperitoneum so that the trocar can enter safely and the distance of abdominal wall from the abdominal viscera should increase. Veress needle technique is the most widely practiced way of access. Before using veress needle every time it should be checked for its potency and spring action. Veress needle is available in three length 80mm, 100mm, 120mm. In obese patient 120mm and in very thin patient with scaphoid abdomen 80mm veress needle should be used.

Slide 55: 

Trocar and Cannula The word "trocar" is usually used to refer to the entire assembly but actual trocar is a stylet which is introduced through the cannula. The trocars are available with different type of tips. The cutting tips of these trocars are either in the shape of a three edged pyramid or a flat two edged blade Conical tipped trocars are supposed to be less traumatic to the tissue. The tip can be penetrated through the parietal wall without cutting and decreased risk of herniation or haemorrhage is reported.

Slide 56: 

Cannulas are in general made from plastic or metal. Plastic devices whether they are transparent or opaque, need to be designed in such a way as to minimize the reflection of light from the telescope. Reusable and disposable trocars are constructed by a combination of metal and plastic. The tip of disposable trocar has a two edged blade. These are very effective at penetrating the abdominal wall by cutting the tissue as they pass through. Most of the disposable plastic trocar has a spring loaded mechanism that withdraws the sharp tip immediately after it passes through the abdominal wall to reduce the incidence of injury of viscera. Trocar and cannula are of different sizes and diameter depending upon the instrument for which it is used. The diameter of cannula ranges from 3 mm to 30 mm; the most common size is 5mm and 10 mm. The metal trocar has different type of tips i.e. pyramidal tip, Eccentric tip, conical tip or blunt tip depending on the surgeon's experience. .

Slide 57: 

All the cannula has valve mechanism at the top. Valves of cannula provide internal air seals, which allow instruments to move in and out within cannula without the loss of pneumoperitoneum. These valves can be oblique, transverse, or in piston configuration. These valves can be manually or automatically retractable during instrument passage. Trumpet type valves are also present which provide excellent seals, but they are not as practical as some of the other systems. They require both hands during instrument insertion, which may explain why they are less often used in advanced laparoscopic cases. The flexible valves limit the carbon dioxide leaks during work whatever the diameter of the instrument used.

Slide 58: 

Surgeon should remember that sharp trocars although looking dangerous are actually better than blunt one because they need less force to introduce inside the abdominal cavity and chances of inadvertent forceful entry of full length of trocar is less. There is always a difference in the marked exterior diameter of the cannula and the interior usable diameter. The end of the cannula is either straight or oblique. An oblique tip is felt to facilitate the easy passage of the trocar through the abdominal wall. Trocar and cannula should be held in proper way in hand so that head of the trocar should rest on the thenareminence, the middle finger should rest over the gas inlet and index finger is pointed towards the sharp end of the trocar

Slide 59: 

Laparoscopic Hand Instruments Laparoscopic hand instruments vary in diameter from 1.8 to 12mm but majority of instruments are designed to pass through 5 to 10mm of cannula. The hand instrument used in laparoscopic surgery are of different length (varies company to company and length of laparoscopic instrument varies from 18 to 45cm) but they are ergonomically convenient to work if they have same length of approximately 36 cm in adult and 28 cm in pediatric practice. Shorter instruments 18 to 25cm are adapted for cervical and pediatric surgery. Certain procedures for adult can also be performed with shorter instrument where the space is constricted. 45cm instruments are used in obese or very tall patients. For better ergonomics half of the instruments should be inside the abdomen and half outside. If half of the instrument is in and half out, it behaves like class 1 lever and it stabilizes the port nicely so the surgery will be convenient. .

Slide 60: 

Most of the laparoscopic procedures require a mixture of sharp and blunt dissection techniques, often using the same instrument in a number of different ways. Many laparoscopic instruments are available in both re-usable and disposable version. Most re-usable instruments are partially dismountable so that it can be cleaned and washes properly. Some manufacturer have produced modular system where part of the instrument can be changed to suit the surgeon favorite attachment like handle or working tip. Most laparoscopic instruments like graspers and scissors has basic opening and closing function. Many instrument manufacturers during past few years are able to rotate at 360 degree angle which increases the degree of freedom of these instruments.

Slide 61: 

Certain types of instrument offer angulations at their tip in addition to usual 4 degree of freedom. These instruments are used to avoid obstacles and for the lateral grasping when the instrument is placed outside of the visual field. This feature is available for both re-usable as well as disposable instrument. The complex mechanism of such instrument makes their sterilization very difficult. A variety of instruments, especially retractors have been developed with multiple articulations along the shaft. When these are fixed with the tightened cable the instrument assumes a rigid shape which could not have been introduced through the cannula. Most of the hand instrument has three detachable parts

Slide 62: 

Handle Insulated outer tube and Insert which makes the tip of the instrument Different Handles of Hand instrument Certain instruments handle are designed to allow locking of the jaw. This can be very useful when the tissue needs to be grasped firmly for long period of time preventing the surgeons hand from getting fatigue. The locking mechanism is usually incorporated into the handle so that surgeon can easily lock or release the jaws. These systems usually have a ratchet so that the jaws can be closed in different position and to different pressure. Most of the Laparoscopic instruments handle has attachments for unipolar electrosurgical lead and many have rotator mechanism to rotate the tip of the instrument.

Slide 63: 

Outer Sheath of Hand Instrument The insulation covering of outer sheath of hand instrument should be of good quality in hand instrument to prevent accidental electric burn to bowel or other viscera. Insulation covering may be of silicon or plastic. At the time of cleaning the hand instrument, utmost care should be taken so that insulation should not be scratched with any sharp contact. A pin hole breach in insulation is not easily seen by naked eye but may be dangerous at the time of electro surgery. Insert of Hand Instrument Insert of hand instrument varies only at tip. It may be grasper, scissors, or forceps. This grasper may have single action jaw or double action jaw. Single action jaw open less than double action jaw but close with greater force thus, most of the needle holders are single action jaw. The necessary wider opening in double action jaw is present in grasper and dissecting forceps. Single action graspers and dissectors are used where more force is required.

Single Action Jaw Graspers : 

Single Action Jaw Graspers These graspers are good when you don't have control over depth and surgeon wants to work in single plane in controlled manner particularly during adhesiolysis Single Action Jaw Graspers

Double Action Jaw Graspers : 

Double Action Jaw Graspers

Slide 66: 

Instruments for Sharp Dissection Scissors Electro surgery hook HF Electro surgery spatula (Berci) HF Electro surgery knife Knife

Scissors : 

Scissors ScissorsJean-Claude Margueron of Emar in Fourteenth Century B.C. invented scissors. Scissors are one of the oldest surgical instruments used by surgeons.  Scissors are used to perform many tasks in open surgical procedure but its use in minimal access surgery is restricted.  In minimal access surgery scissors require greater skill because in inexperienced hand it may cause unnecessary bleeding and damage to important structures.

Slide 69: 

.  Types of Laparoscopic Scissors straight scissor….. The blade of this scissor is straight and it is widely used as an instrument for mechanical dissection in laparoscopic surgery.   Straight scissor can give controlled depth of cutting because it has only one moving jaw. At the time of cutting the fixed jaw should be down and moving jaw should be up. Curved Scissors The blade of this scissors is slightly curved and this is the most widely used scissor in laparoscopic surgery.  These scissors are mounted on a curved handle which is either fixed or retractable. The type with a fixed curvature proximal to the scissor blades require introduction through flexible valve-less ports. The surgeon prefers this scissors because the curvature of the blade of this scissors abolishes the angle of laparoscopic instruments manipulation and better view through telescope. Serrated Scissors The main advantage of this scissors is that the serrated edges prevent the tissue to slip out of the blades.  It is a useful instrument in cutting a slippery tissue or ligature. Serrated scissors may be straight or curve.

Slide 70: 

Hook Scissors The sharp edge of both blades is in the shape of a flattened C. The blades can be partially closed, trapping tissue in the hollow of the blades without dividing it and allowing it to be slightly retracted. This allows the surgeon to double check before he closes the blades completely. The main advantage of this scissors is that, it encircles the structure before cutting: Tissue is held between its jaws and there is no chance of slipping.  The Hook scissor is especially useful for cutting secured duct or artery in laparoscopic surgery.  The cutting of nerve bundle in neurectomy becomes very easy with the help of this scissors.   Hook scissors is also helpful in partial cutting of cystic duct for intra-operative Cholangiography. All the other scissors cut from proximal to distal whereas the hook scissors cut distal to proximal .

Slide 71: 

Micro-tip Scissors These very fine scissors, are either straight or angled, and are used to partially transect the cystic duct. The main advantage of this scissors is to cut the ducts partially for facilitating cannulation.  This scissor may be used for cutting the cystic duct for performing intra-operative Cholangiogram.  Exploration of small ducts like common bile duct is very helpful with micro scissors due to its fine small blades.  Fine micro scissors are also available in its curved form. The use of scissors endoscopically requires little modification of open techniques. The basic instrument is a miniaturized, long handled version of conventional scissors and can be single or double action. There are some special types of scissors used in endoscopic surgery

Slide 72: 

Endo-knife (scalpel) The knife is not used frequently in endoscopic surgery due to the problems associated with the safety of a blade, which cannot be closed or deactivated. However it does have some important uses; In our practice a disposable blade (Beaver) is mounted on a metal rod, which has a socket at the distal end into which it can be screwed. The most common use of the knife is for opening the hepatic duct or common bile duct during exploration for stones. A small, clean cut, linear stab wound is created in the anterior wall. Great care is required during incision and removal of the knife. However a sharp curved scissors is better and safer than the endoknife for the choledochotomy.

Slide 73: 

Biopsy Forceps Punch, Cutting and Dissecting biopsy forceps are used to take biopsies at the time of laparoscopic surgery. The toothed punch biopsy forceps has special teeth which prevent accidental drop of tissue inside the abdominal cavity

Slide 74: 

Coagulating and Dissecting Electrodes Spatula and hook is the main electrode used for monopolar cutting and coagulation. Spatula is either "W" shaped or Blunt. Hooks are also of various shapes eg; "L" shaped, "J" shaped or "U" shaped. Some ball shaped, Barrel shaped or straight coagulation electrodes are also available to achieve proper haemostatis. These blunt electrodes are particularly useful when there is generalized oozing of blood and surgeon can not see specific bleeder point eg; bleeding from the gallbladder bed at the time of laparoscopic cholecystectomy. These blunt electrosurgical instruments are also used for fulguration at the time of ablation of endometriosis.

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Bipolar Forceps Bipolar forceps are one of the very important electrosurgical instruments in minimal access surgery. It is safe compare to monopolar current because electron travels only through the tissue held between the jaw and patient body is not a part of circuit. Both the jaw of bipolar is insulated and the patient return plate is not necessary to be attached.

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Aspiration Needle These needle is used in laparoscopy to aspirate fluid from distended ovarian cysts, gall bladder, or any localized pocket of pus in liver. It may be used for drilling of polycystic ovary. Aspiration needle should be inserted inside the abdominal cavity with extreme precaution because if the pathway of entry or exit is ignored it can cause perforation of viscera.

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Fan retractor These retractors are used to retract Liver, Stomach, Spleen or bowel whenever they interfere in vision or they come in way of other working instrument. There are many newer variety of retractors are available now a days which are less traumatic. Cuschieri liver retractor is one of them which is very useful in Fundoplication. This liver retractor has a distal end which can be rotated by moving handle. Retractor is introduced in abdominal cavity when it is straight. Once it is inside the abdomen the distal end can take various shapes just like serpent. This retractor can also be used for simple, atraumatic manipulation of bowel.

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Needle holders If surgeon or gynaecologist wants to perform any advance laparoscopic procedure they should develop art of laparoscopic suturing and knotting. Laparoscopic knotting and suturing should be learnt on a good quality endotrainer.. Surgeon should slowly expertise these techniques. They will develop their confidence once they are capable of suture inside abdominal cavity and there conversion rate will also decrease. Many automatic laparoscopic suturing devices are invented for intracorporeal suturing but none of them are substitute of manual laparoscopic suturing because these devices can work only under appropriate tissue plane suitable for there application.

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Knot Pusher Although pre-tied loops are available in the market but surgeon should learn how to tie these extracorporeal knot. Pre-tied loop can be used for any free structure like appendix but for continuous structure like cystic duct surgeon has to perform extracorporeal knotting intra-operatively. For Extracorporeal Knotting knot pushers are used. These knot pushers are of either closed jaw or of open jaw type.

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Laparoscopic clip applicator Titaneum is most widely used metal in minimal access surgery for tissue approximation. It rarely reacts with human body and this is one of the good properties why it is so popular. It is easy to apply and can be left inside abdominal cavity. After few weeks it is covered by fibrous tissue. Titaneum clip is used by 99% of surgeons for clipping cystic duct and cystic artery at the time of laparoscopic cholecystectomy. Recently newer silicon clips has been launched.

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The jaw of clip applicator should be at right angle to the structure and before clipping surgeon should take care that both the jaw is seen. If one of the jaws is hidden there is always a possibility that some tissue will get entrapped between the jaw of clip and clip will be loose. At the time of securing any duct or artery with titanium clip, three clips are generally applied. Two clips are left towards the structure which is secured and one clip is towards the tissue which surgeon wants to remove to prevent spillage of fluid. The distance between first and second clip should be 3mm and distance between second and third clip should be 6mm so that after cutting in between second and third clip there will be 3 mm stump both the side. The clip should not be applied very near to each other, because clips are held in position by dumbbell formation and if they are very near to each other they will nullify the dumbbell formation of each other and both the clip will be loose.

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Cystic duct clip stone Recently many cases have been reported of cystic duct clip stone and this is the reason why in many institutions clipping of cystic duct is replaced by extracorporeal knotting. If titanium clip is applied on the cystic duct sometime it may crush one of the walls of cystic duct and it may get internalized inside the lumen of cystic duct. Inside the lumen of cystic duct it acts as a niddus for the deposition of bile pigment and then formation of stone. After cross section of these stone the clip inside is seen glistening like pupil of a cat and so it is also known as "Cat eye stone". These stone can slip inside the CBD and it may cause CBD obstruction. Although the reported case of CBD obstruction is very less the surgeon should try to ligate cystic duct to avoid this complication.

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Irrigation and Suction tube Laparoscopic suction and irrigation tube is one of the very important instruments which surgeon should practice frequently. Vision is one of the limitations of laparoscopic surgery. The blood is the darkest colour inside abdominal cavity and excess of blood inside absorbs most of the light. Whenever there is bleeding inside one should first try to suck it out. Suction irrigation tube also can be used for blunt dissection. At the time of using suction and irrigation the tip of the suction irrigation cannula should be dipped inside blood otherwise the gas will be sucked and surgeon will loss his vision due to loss of pneumoperitoneum. 10 mm suction tube should be used if there is more than 1500ml of hemoperitoneum or if there is blood clots inside the abdominal cavity. Sometime small spilled stones can also be sucked with the help of laparoscopic irrigation suction tube at the time of laparoscopic cholecystectomy.

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Fallop ring applicator Fallop ring applicator is used for application of silastic ring to perform tubeligation. These may be fitted with one or two silastic rings. Myoma Fixation screw This is used to fix the sub serous or intramural myoma at the time of laparoscopic myomectomy.

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Uterine manipulator Uterine manipulator is one of the very essential instruments for mobilization of the uterus, identification of the fornices and sealing during hysterectomy. Uterine manipulator is used in most of the advance gynaecological procedures. Fallop ring applicator is used for application of silastic ring to perform tubeligation. These may be fitted with one or two silastic rings.

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thank u