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Laparoscopic instruments diameter and length ranges
2-10mm, 30-45cm
Hopkins rod lens
light has to travel back through the rod to capture the image.
decreasing light in the camera for...
decreasing diameter, increasing scope angle (ie 5mm and 30 degree has less light
than 10mm 0 degree)
When is zero degree scope most useful
when working in a small area directly in line with the scope and ports, like the
pelvis
how to check fiber optics light connection
black dots= broken fibers
why does it fog up?
temperature and humidity discrepancy between the OR and body
,tools for defogging
FRED antifog (must dry before putting back in), put laparoscope in hot water
methods to clean a smudged lens
gently wipe on clean tissue (liver, uterus, bowel), remove scope and clean with hot
water and gauze
Insufflation gas type and reasoning
CO2- readily available, inexpensive, non combustible, warmed and humidified
better
high flow insufflation
10 or more L per minute
preventing loss of pneumonia with suctioning
keep suction tip below the fluid level
most common light source
300W xenon lamp
Troubleshooting steps: gas preOP
1. check that co2 tank is full
2. check co2 tank gasket is secured
3. check that spare co2 tank is available in the OR
, troubleshooting steps: image
1. check that the monitor is plugged in and turned on 2. check that all cables are
connected securely
troubleshooting steps: loss of working space: insufflator settings: measured
pressure is the same or higher than the preset pressure
1. the patient may not be adequately relaxed or there is a mechanical block of gas
flow
2. inspect abdomen for rhythmic muscle contraction and palpate the abdomen for
firmness
3. check port valves to make sure they are open
4. check for kinks in tubing and make sure no one is standing on them
troubleshooting steps: loss of working space: insufflator settings: low pressure
and high flow rate
1. there is a leak in the insufflation circuit
2. check that the tubing has not become disconnected from insufflator or port
3. check that all valves are closed
4. check all port sites for leaking co2
5. check for foley catheter bag distention or bowel distention