Common troubleshooting and repair of Stryker laparoscopes

1.1 Malfunction Phenomenon：

Turn on the camera, insert the camera, connect the video cable, and the monitor displays no image.

1.2 Analysis and Repair：

The laparoscopic imaging process involves image acquisition by the camera, then output through the camera host, and finally input to the monitor via the video cable. A lack of image on the monitor could be caused by damage to the camera, camera host, video cable, or monitor. First, let's rule out the camera. Insert a known good camera of the same type into the camera system; if the malfunction persists, the camera is ruled out. Disconnect both ends of the video cable and measure it with a multimeter; if the video cable is good, it is ruled out. Replace the original monitor with one of the same model; if the image appears, the monitor is faulty. Upon inspection, it was found that the video terminal connecting the monitor and the video cable was severely loose. The monitor was removed, the casing opened, and the video terminal inspected. It was found that the video terminal had become unsoldered due to pulling. After resoldering or using a wire to weld it, the monitor was connected, and the machine was restarted. The image was clear, and the fault was resolved.

2.1 Malfunction Phenomenon：

During the surgical procedure, the monitor image is too dark, and when using the high-frequency electrosurgical unit, there are continuous wavy lines on the monitor image.

2.2 Analysis and Repair:

During the surgical procedure, the monitor image is dark and distorted. A substitution method was used for repair. A good camera and endoscope were used to replace the camera and endoscope used in this set of equipment. It was found that the monitor image was still dark and distorted, so the camera host, camera, and endoscope were ruled out. The possibility of monitor setting parameters or monitor damage was suspected. In the monitor, the main menu was called up, the RGB menu was entered, and the "color saturation" item was selected to adjust the number (a larger number makes the color darker, and a smaller number makes the color lighter). As the number was adjusted, the monitor image changed significantly in lightness and darkness, indicating that the monitor was good and the parameters had changed. After adjusting to the appropriate image, the fault was resolved.

During surgery, when using the high-frequency electrosurgical unit, continuous wavy lines appear on the monitor image. This is due to damage to the video cable connecting the camera host and the monitor, resulting in poor shielding. Simply repairing the damaged area or replacing the video cable will resolve this fault.

3.1 Malfunction Phenomenon:

The high-frequency electrosurgical unit is connected to the negative plate and its connecting wires. When the machine is turned on, the negative plate alarms, and the high-frequency electrosurgical unit does not work.

3.2 Analysis and Repair:

This malfunction is mainly due to problems with the negative plate patch, connecting wires, or high-frequency electrosurgical unit.
First, a new negative plate patch (single piece) was replaced; the malfunction persisted. Then, the negative plate connecting wires were tested with a multimeter; both ends of the connecting wires were conductive, indicating no problem. The high-frequency electrosurgical unit casing was opened, and the connecting wire plug and the electrosurgical unit contact area were inspected. It was found that the copper leaf contacting the top of the connecting wire plug had stains and severe surface oxidation. After cleaning the stains from the leaf and polishing the surface oxidation layer with sandpaper to ensure good contact between the connecting wire top and the leaf, the machine was restarted. The negative plate did not alarm, and the high-frequency electrosurgical unit worked normally.

4.1 Malfunction Phenomenon:

During the surgical procedure, the insufflator pressure was reported to be too low, affecting the surgery.

4.2 Analysis and Repair:

After turning on the machine and testing, the flow rate was first tested. The flow rate was set to 20 at "preset flow," and the CO2 outlet of the insufflator was allowed to vent freely. After pressing "start" to vent, it was observed that "actual Flow" was also 20, indicating that the flow rate was normal. Then, the pressure was tested. The pressure was set to 15 mmHg (1 mmHg = 0.133 kPa) at "preset pressure." A surgical glove was placed over the CO2 outlet of the insufflator, and "start" was pressed to vent. After observing for a while, it was found that the "actual pressure" displayed value was also 15 mmHg, indicating that the pressure test was normal and the insufflator was good.

The fault may be in the external tubing of the insufflator. Inspection revealed that the CO2 outlet connecting tube of the insufflator was damaged, causing the pressure to be too low. Replacing the outlet connecting tube resolved the fault.

Stryker laparoscopes are precision electronic and optical instruments. Malfunctions are often caused by improper use, operational errors, or failure to replace related consumable materials or accessories in a timely manner. Therefore, strict adherence to operating procedures and maintenance can better reduce the failure rate and fully utilize the instrument equipment.

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