Durr-e-sabih, Muhammad Kashif Rahim.
Syringe grip assembly with self locking negative pressure mechanism to assist in transabdominal percutaneous chorionic villus sampling and other aspirations.
Pak J Med Res Jan ;55(4):121-2.

The study was done at Multan Institute of Nuclear Medicine and Radiotherapy (MINAR), Multan for a period of three years on more than 1200 patients. The improvised device (standard pistol grip) was mounted onto the syringe which was being used to aspirate chorionic villus samples or other large volume aspirations. The device was used after initial review and approval by the ethics committee of the institute. A standard pistol grip was modified to hold a standard disposable syringe of 10ml or 20 ml capacity and also maintain negative pressure. This device is simple and light weight (100g). The holder is modified to enable a constant negative pressure by a self locking ratchet and lever mechanism (Figure-2). This allows the negative pressure to be maintained automatically by holding the syringe plunger in place, leaving the hand free to manipulate the needle tip into the appropriate location. In addition to the self locking mechanism, the grip also has a “zero” positioner, which ensures that the empty syringe can be easily and rapidly fitted into the slot without manipulating the plunger to ensure alignment of the syringe cylinder flange with the slots. True to the original design objective, the aspiration procedure became almost effortless when this device is used. The assembly adds some bulk to the syringe but the device is light (~100g) and the whole assembly can be held in a pen-like grip to allow very precise needle tip placement. The syringe holding components are fashioned in a half circle with slots for the flanges of the syringe cylinder and piston, enabling rapid loading and removing the syringe from the assembly. The assembly as currently designed can accommodate a standard 10 or 20 ml syringe; it makes the application of negative pressure almost effortless enabling more procedures to be done in a day as the limiting factor of muscle sprain is no longer a consideration. Although designed with the CVS procedure in mind, the device can be used for syringe aspiration for any material.

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