We feel the weld has helped us in avoiding screws at the tip. This in turn makes the suturing more accurate and precise. Outer diameter of the needle shaft is fixed same as the internal diameter of a 5 mm laparoscopic port, so when the needle holder is inserted into the abdomen through the 5 mm laparoscopic port it provides structural stability to the needle shaft as well as the needle holder hence preventing any wobbling of the needle holder within the port. The technical specification of the ‘prototype 3/5 laparoscopic needle holder’ comprised of two cannula or cylindrical tubes of different diameter coaxially joined, wherein a portion of the length of the cannula housing the jaws of the needle holder had a smaller diameter (3 mm) and was welded within the cannula of large diameter (5 mm) constituting the rest of the needle holder shaft. This helps in avoiding screws at the tip and hence makes knot throwing seamless
(b) The importance of weld at the tip of the needle holder holder. (a) Schematic drawing of the prototype laparoscopic needle holder. We describe a needle holder which aims to overcome the above-mentioned limitations. Profile of the tip of the needle holder (the tip of the needle holder should be smooth, the knot thrown tends to get entangled if the tip is not smooth)ĭiameter and circumference of the port (the smaller the size of the port greater the stability). Shaft size (the shaft size, if is the same as that of the port, the physiological tremors are less magnified)
The factors which contribute to stability and accurate suturing in laparoscopy are:. This is relevant, in paediatric patients as an excess length of the needle shaft remaining extracorporeal magnifies the tremors at the tip of the instrument. Since all the laparoscopic needle holders are supposed to be a Type 1 lever meaning, half of the needle shaft of the laparoscopic needle holder should always lies outside the body while the other half remains inside. The needle holders although available in a number of shaft sizes, the most common ones available are 5 mm shaft diameter.
#Prototype 3 driver
Most of the currently available needle holders have the same needle driver ‘shaft’ diameter as that of the needle driver ‘tip’. Laparoscopic needle holder is a ‘key’ instrument to accomplish this arduous task. The challenges include need to develop the expertise to suture in a narrow closed milieu in a two-dimensional vision. Suturing is the most critical step in any laparoscopic procedure.
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