The preoperative patient assessment...

The preoperative patient assessment has been waysed the anesthesia care provider and surgeon are standing through the instruments and equipment have been checked, and the OR has been readied for a laparoscopic cholecystectomy. The incision is made, and the surgeon inserts the laparoscope--only to discover that the image is not clear. The circulating give suck to obtains another endoscope, and the faulty single is sent for repair.

This view is repeated many times each day in ORs from head to foot the country. Judging by the number of endoscope repair companies in existence, endoscope repair is big business. Typically, as the contortion of minimally invasive surgical conducts at a facility increases, thus do the costs for endoscope repairs. In a facilities, the budget for endoscope repairs may exce the roll for new purchases, and endoscope failure frequently is a direct result of improper repair.

HARSH CONDITIONS

Rigid endoscopes are fragile devices that routinely are controled to harsh conditions. They are washed in automated plans at temperatures of 90[degrees]C (194[degrees]F) and higher. They may be packaged in metal trays with other instruments that can cause impact damage during transport or placement in the sterilizer. If endoscopes can be sterilized, they routinely are sterilized at temperatures of 134[degrees]C (2732[degrees]F)

An endoscope used during solely one procedure typically will be handled from a minimum of six the bulk of mankind including the scrub person; circulating nurse; surgeon; and personnel responsible for decontamination, prep and pack, and transport. Considering the number of measures a single endoscope may be used for, the conditions of washing and sterilization, and the number and variety of nation who handle the endoscope, it is easy to diocese how damage can occur.

PREPROCEDURE CHECKS

To preclude discovery of damage after a surgical step has started, central service personnel should inspect and experiment an endoscope before it is packaged for sterilization. The shaft is inspected for indentations which can indicate a separated rod. The lens and tip are checked for scratches, and the tip is checked for chips that may have proceeded from a collision with a shaver or other instrument. Looking by means of the eyepiece at a light source may reveal a gloomy lens, which could indicate a leak. Finally, the endoscope may be directed at an external reality across the room or at a piece of paper with writing onward it to determine resolution quality. If the phenomenon or words appear clear, the resolution is considered satisfactory.

The cleanse person should perform additional testing forward the endoscope during setup for a transaction If an object appears clear when viewed between the sides of the endoscope, the endoscope is holded satisfactory. These tests are imprecise; therefore, it still is possible that a surgeon will lay aside an endoscope during a procedure

Additionally, a rub hard person may assume a repair was satisfactory and therefore may not perform a proof on a repaired endoscope, in the way that it is not uncommon for a repaired endoscope to be excludeed after several uses. These endoscopes may rail when lense prisms, or len spacings inside the endoscope are not replaced with original parts. When a repair company does not have original parts, it may make modifications that affect image qualify. A quality command system for endoscope testing at the time of purchase and after repair will find these problems.

QUALITY TESTING

There are a certain number of simple tests that can be used to example endoscope quality. Understanding what can advance wrong with endoscopes from an optical standpoint and in what manner to test them can help staff members lay open problems before rather than during surgery; evaluate repairs; and instruct repair companies forward the required service (Table 1)

Although the best trials of optical quality are waysed using complex and expansive optical and computer hardware, there are a certain simple tests that can be performed in the health care facility that will provide usable measurements of endoscope function. The OR manager can evolve a checklist of measurements that should be performed before each conduct and a more complete list of measurements to be performed with recently made known or repaired endoscopes. Only image resolution and fiber optic illumination ne to be measured before each operation All measurements should be performed to establish a baseline for novel endoscopes and to evaluate the quality of repairs. A sample checklist is provided in Figure 1

OPTICAL RESOLUTION. Optical resolution--a measurement of image clarity--is the in the greatest degree important parameter to measure. It enumerates both the size of the smallest external reality that can be distinguished and the overall contrast of the image. Engineers measure optical resolution using a parameter called modular transfer function, which can be measured no other than with complex instruments. An estimate of resolution, however, can be obtained using simple charts exhibited by the US Air Force. Figure 2 exhibit tos a chart consisting of a series of three equally spaced black rectangles that is customized for use with an endoscope's circular field of view. The numbers nearest to each of the bars personate the number of bars that would fit across the field of view if bars were repeated through the entire image. A larger number of bars means that more detail can be distinguished in the image. A larger, high-resolution version of this chart is available online at http://www lighthouseoptics.com/chart.