Abstract:
A transducer-tipped intrauterine pressure catheter system (10) for measuring, and delivering to an external monitor (230) a signal representative of, be pressure in the uterus of a woman in labor. The system has a disposable catheter (50) with an affixed asymmetric tip (52). A disposable, slotted, C-shaped introducer (120) engages and positions the catheter. A reusable monitor cable (220) has a second connector (164) (which engages a first connector (162) on the end of the catheter) on one end and a monitor connector (which engages the monitor) on its opposite end; the monitor cable transmits electrical signals from the first connector to the monitor. A test member (240) is proximate the monitor connector on the monitor cable. The test member includes test circuitry assuring that the monitor cable, the second connector, and the monitor connector are operational. The test member also includes circuitry to "zero" the system. The system may also have a disposable luer fitting (200) engaging the amnio lumen of the catheter and providing direct communication, through the amnio lumen, into the uterus. The luer fitting allows fluid samples to be withdrawn from, and fluids to be infused into, the uterus. An anti-bacterial coating may be bonded to the catheter, the tip affixed to the catheter, and the introducer.
Abstract:
An intrauterine pressure catheter system for monitoring pressure in the uterus of a mother during labor and delivery. The system includes a reusable junction box (12) with a needle communicating directly to a pressure transducer sensor. The sensor transmits changes in pressure to a conventional pressure monitor. A connector (32) attached to the catheter (22) is pushed into the junction box (12) and is held in place by a plastic latch (38). Inside this connector (32) are an elastomeric plug and an adjacent diaphragm. When the connector is installed in the junction box (12), the needle pierces the plug and the tip enters the air-filled volume between the plug and the diaphragm. Fluid pressure in the catheter (22) is communicated to the diaphragm surface and, in turn, passed to the air in the volume between the diaphragm and the plug. Thus, the intrauterine pressure is transmitted directly to the sensor. The system may be zeroed to atmosphere by simply removing the connector from the junction box (12).
Abstract:
An integrated introducer and drive rod system used to position and attach a spiral-shaped, biological needle probe to a fetus during labor and delivery. The system ensures that the sharp, pointed, probe (typically, a fetal spiral electrode) remains protected in a retracted position inside the introducer until attachment to the fetal scalp is desired. The flexible drive rod of the system has a "C"-shaped safety ring with an outside diameter slightly less than the inner diameter of the introducer at a point on the introducer; a "C"-shaped radial web with an outside diameter only slightly larger than the inner diameter of the introducer creating an interference fit between the drive rod and the introducer; or a "C"-shaped segmented rib that engages the rear end of the introducer. The introducer has an inner diameter sized to create an interference fit with the drive rod; a forward interior wall with an inside diameter slightly less than the outside diameter of the safety ring; a ramp on the front end of the introducer; a longitudinal slot disposed along its entire length; or a combination of one or more of these structures. In combination, the structures of the drive rod and introducer resist but (upon exertion of a predetermined force on the handle of the drive rod) allow translation of the drive rod within the introducer.
Abstract:
An integrated introducer and drive rod system used to position and attach a spiral-shaped, biological needle probe to a fetus during labor and delivery. The system ensures that the sharp, pointed, probe (typically, a fetal spiral electrode) remains protected in a retracted position inside the introducer until attachment to the fetal scalp is desired. The flexible drive rod of the system has a "C"-shaped safety ring with an outside diameter slightly less than the inner diameter of the introducer at a point on the introducer; a "C"-shaped radial web with an outside diameter only slightly larger than the inner diameter of the introducer creating an interference fit between the drive rod and the introducer; or a "C"-shaped segmented rib that engages the rear end of the introducer. The introducer has an inner diameter sized to create an interference fit with the drive rod; a forward interior wall with an inside diameter slightly less than the outside diameter of the safety ring; a ramp on the front end of the introducer; a longitudinal slot disposed along its entire length; or a combination of one or more of these structures. In combination, the structures of the drive rod and introducer resist but (upon exertion of a predetermined force on the handle of the drive rod) allow translation of the drive rod within the introducer.
Abstract:
A transducer-tipped intrauterine pressure catheter system (10) for measuring, and delivering to an external monitor (230) a signal representative of, be pressure in the uterus of a woman in labor. The system has a disposable catheter (50) with an affixed asymmetric tip (52). A disposable, slotted, C-shaped introducer (120) engages and positions the catheter. A reusable monitor cable (220) has a second connector (164) (which engages a first connector (162) on the end of the catheter) on one end and a monitor connector (which engages the monitor) on its opposite end; the monitor cable transmits electrical signals from the first connector to the monitor. A test member (240) is proximate the monitor connector on the monitor cable. The test member includes test circuitry assuring that the monitor cable, the second connector, and the monitor connector are operational. The test member also includes circuitry to "zero" the system. The system may also have a disposable luer fitting (200) engaging the amnio lumen of the catheter and providing direct communication, through the amnio lumen, into the uterus. The luer fitting allows fluid samples to be withdrawn from, and fluids to be infused into, the uterus. An anti-bacterial coating may be bonded to the catheter, the tip affixed to the catheter, and the introducer.