Vance Products Inc.

Joseph R Stines

A rotational pressure drive for filling a medical syringe with a fluid and obtaining, maintaining, and releasing 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 partially closed, proximal end with an opening therethrough. The drive further includes an axial extension member extending through the opening in the partially closed end for engaging and urging the proximal end of the syringe plunger toward the partially closed, proximal end. The drive, in another aspect, includes a syringe plunger having a distal and a proximal portion. The distal portion is inserted into the syringe barrel with the proximal portion extending through the opening of the partially closed, proximal portion of the drive. 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 plunger or axial extension member of the drive is pulled toward the partially closed, proximal end of the drive to fill the syringe with fluid. 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 hollow chamber of 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.

Rotational pressure drive for a medical syringe

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.

A pressure gauge which may be operably coupled to a fluid pressure supply device and a balloon catheter. The pressure gauge includes a mechanism which impedes a contaminant, such as corrosion and acid flux, from entering the pressurized fluid being measured. In one embodiment, this mechanism may include a piston positioned in a piston chamber. The piston has at least one, and preferably two, O-rings nested therearound to provide a seal with the piston chamber's wall. The piston may include an inter-gasket pressure chamber positioned between two O-rings which is communicated to the top or bottom of the piston, resulting in pressure equilibrium. Several inter-gasket pressure chambers may be provided.

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Poland, IN, United States of America

Joseph R Stines