Importance

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Abstract

A rotational pressure drive for a medical syringe to obtain, maintain, and release a desired fluid pressure within the syringe. The commercially available medical syringe includes a barrel with a plunger extending therein. Extending laterally and radially about the proximal end of the syringe barrel are several flanges. The rotational pressure drive comprises a hollow cylindrical chamber with a closed end for engaging the proximal end of the syringe plunger, and a hollow passageway extending therethrough to an open end which receives the plunger. Positioned circumferentially and longitudinally along the chamber are pluralities of internal threads with individual starts for engaging the radially extending flanges of the syringe barrel. The extended plunger is inserted into the passageway of the drive to the closed end, whereas the flanges of the syringe barrel are rotationally engaged with the starts of the internal thread pluralities for advancement into the passageway of the drive. As the pressure drive is rotated with respect to the syringe barrel, the plunger is pushed into the syringe barrel to obtain and maintain a desired fluid pressure therein. A pressure relief assembly is connected to the distal end of the syringe to limit the fluid pressure within the barrel and thereby prevent overexpansion or damage to an angioplasty balloon or other medical inflation treatment device.

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First Claim