A experimental study of laparoscopic suture guide set assisted suture / 中国医师杂志

ABSTRACT

Objective:To design a laparoscopic suture guide set based on the principle that the ends of three struts on the arc of the same center, and to explore the rationality and practicability of the device by suture experiment in an isolated human kidney.Methods:⑴ The device was made. The three struts of the device were arranged on the fixed shaft in sequence. The function structure included the direction limitation device and the needle exit site locating device. The direction limitation device included the U-shaped end of the second strut and arc cylinder of the third strut. The needle exit site locating device was the Y-shaped end of the first strut. The ends of the three struts were on the same circular arc with the fixed axis as the center of the circle. When the long round needle of the same radian entered the curved cylinder (the first direction limitation device), it was restricted by the cylinder to travel to the U-shaped end of the second strut (the second direction limitation device), and was guided by the two devices to the Y-shaped end of the first strut (the needle exit site locating device). A built-in torsion spring clamped the kidney to fix the device. The design of the device was drawn into a 3D figure, printed by a metal 3D printer with titanium alloy, polished and then assembled into a finished product. ⑵ Experiment. Four kidneys of patients underwent retroperitoneal laparoscopic radical nephrectomy was cut open, and 8 needle insertion and exit points were designed along the long axis. The kidney sutured with conventional methods was set as the conventional group. Then the laparoscopic suture guide set was used to assist the suture, which was set as the guide group. For effective suture, the distance between the actual insertion point and the preset insertion point was less than 1.0 cm. If the distance was greater than 1.0 cm, re-suture rate and deviation distance were observed. The distance between the actual injection point and the preset injection point was less than 0.5 cm, which means the point is conformant, and the conformance rate was observed. Single needle suture time was observed in 2 groups.Results:In the experiment, 15 stitches deviated more than 0.5 cm, 10 stitches deviated more than 1.0 cm in the conventional group, the re-suture rate was 31.3%(10/32), the conformance rate was 53.1%(17/32), and the deviation distance was 0.6-1.15(0.41±0.48)cm. In the guide group, 5 stitches deviated more than 0.5 cm, 2 stitches deviated more than 1.0 cm, the re-suture rate was 6.3%(2/32), the conformance rate was 84.4%(27/32), and the deviation distance was 0.6-1.10(0.14±0.34)cm. There were statistically significant differences in the above indicators between the two groups ( P<0.05). The single stitch suture time in the conventional group ranged from 3-12(6.00±3.32)seconds, and that in the guide group ranged from 5-11(5.94±1.41)seconds. There was no significant difference in single stitch suture time between the two groups ( P>0.05). Conclusions:The structure design of laparoscopic suture guider is relatively reasonable. The device can ensure the direction of the surgical needle, reduce the number of times to adjust the surgical needle, and the needle position is accurate. It has a good auxiliary effect for suture in vitro, but the guider needs to be operated under laparoscopy to further verify its rationality and practicability.