Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1998-06-01
2000-05-16
McDermott, Corrine
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604 97, 604181, A61M 2900
Patent
active
060630574
ABSTRACT:
The invention relates to a syringe device for limiting the pressure of inflation fluid injected into a balloon catheter. The device includes a cylindrical housing having a proximal end and a distal end. A piston is received within and reciprocally movable between the distal end and the proximal end of the housing. A shaft having a proximal end and a distal end is received within an opening at the proximal end of the housing. The distal end of the shaft is coupled to the piston and the proximal end of the shaft is coupled via a slip clutch device to a hand knob. At least a portion of the external surface of the shaft is fitted with a screw thread, which may be selectively engaged with a complementary screw thread fitted either within the opening at the proximal end of the housing or a collar coupled to the housing. When the shaft is in threaded engagement with the housing, the slip clutch enable the transmission of torque from the knob to the shaft to allow the incremental axial movement of piston if the pressure of the medium within the housing is at or below a predetermined maximum allowable value. However, if the pressure of the medium exceeds the predetermined maximum value, the frictional elements within the slip clutch slip relative to each other and prevent the transmission of torque from the knob to the shaft, and thus any further pressurization of the fluid medium.
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McDermott Corrine
Medtronic Ave Inc.
Rodriguez Cris L.
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