Pressure measurement device
First Claim
1. An apparatus for measuring physiological pressure comprising:
- a pressure transmission catheter filled with a pressure transmitting medium and implantable in an area having a physiological pressure;
a connecting catheter carrying electrical wires;
a transducer coupled to the electrical wires and in communication with the pressure transmitting medium to provide a pressure signal representing variations in the physiologic pressure on the electrical wires;
signal processing and telemetry circuitry coupled to the electrical wires to receive the pressure signal and provide a telemetry signal representing the pressure signal; and
a housing holding the signal processing and telemetry circuitry, wherein the transducer is remote from the housing.
5 Assignments
0 Petitions
Accused Products
Abstract
A device measures pressures in animals and humans and includes a pressure transmission catheter (PTC) filled with a pressure transmitting medium and implantable in an area in having a physiological pressure. A transducer conmmunicates with the pressure transmitting medium to provide a pressure signal representing variations in the physiologic pressure on electrical wires. A connecting catheter carries the electrical wires to signal processing and telemetry circuitry, which transmits a telemetry signal representing the pressure signal to a receiver external to the animal or human. A housing holds the signal processing and telemetry circuitry, but the transducer is remote from the housing. The device is particularly useful in measuring venous pressure, pulmonary pressure, bladder pressure, or intracranial pressure without significant head pressure artifact and with a sufficient dynamic response. One embodiment of the PTC includes a multi-durometer stem.
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Citations
39 Claims
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1. An apparatus for measuring physiological pressure comprising:
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a pressure transmission catheter filled with a pressure transmitting medium and implantable in an area having a physiological pressure; a connecting catheter carrying electrical wires; a transducer coupled to the electrical wires and in communication with the pressure transmitting medium to provide a pressure signal representing variations in the physiologic pressure on the electrical wires; signal processing and telemetry circuitry coupled to the electrical wires to receive the pressure signal and provide a telemetry signal representing the pressure signal; and a housing holding the signal processing and telemetry circuitry, wherein the transducer is remote from the housing. - View Dependent Claims (2, 3)
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4. An apparatus for measuring physiological pressure comprising:
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a pressure transmission catheter filled with a pressure transmitting medium and having a distal tip for placement in an area having a physiological pressure and a proximal end; a connecting catheter carrying electrical wires; a transducer coupled to the electrical wires and in communication with the pressure transmitting medium at the proximal end of the pressure transmission catheter to provide a pressure signal representing variations in the physiologic pressure on the electrical wires; signal processing circuitry coupled to the electrical wires to process the pressure signal; and wherein a distance between the distal tip and the proximal end of the pressure transmission catheter is sufficiently short to avoid significant head pressure artifact and provide sufficient dynamic response yet sufficiently long to accommodate surgical limitations and tolerance concerns in applications for measuring physiological pressures where, if a length of the pressure transmission catheter was the combined length of the pressure transmission catheter and the connecting catheter, there would be a significant head pressure artifact and/or an insufficient dynamic response. - View Dependent Claims (5, 6)
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7. An apparatus for measuring physiological pressure comprising:
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a pressure transmission catheter filled with a pressure transmitting medium and having a distal tip for placement in an area having a physiological pressure and a proximal end, wherein a distance between the distal tip and the proximal end is sufficiently short to avoid significant head pressure artifact and provide sufficient dynamic response yet sufficiently long to accommodate surgical limitations and tolerance concerns; a connecting catheter carrying electrical wires; a transducer coupled to the electrical wires and in communication with the pressure transmitting medium at the proximal end of the pressure transmission catheter to provide a pressure signal representing variations in the physiologic pressure on the electrical wires; signal processing circuitry coupled to the electrical wires to process the pressure signal; and a housing holding the signal processing circuitry, wherein the transducer is remote from the housing. - View Dependent Claims (8, 9)
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10. A pressure transmitting catheter implantable in an area having a physiological pressure, the pressure transmitting catheter comprising:
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a lumen filled with a pressure transmitting medium; a first layer material surrounding the lumen; and at least one additional layer of material surrounding the first layer material, wherein the at least one additional layer of material has at least one material with a different hardness than the first layer material. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An apparatus for measuring physiological pressure comprising:
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a pressure transmission catheter implantable in an area having a physiological pressure and including; a lumen filled with a pressure transmitting medium, a inner layer material surrounding the lumen, and an outer layer material surrounding the inner layer material, wherein the outer layer material has a different hardness than the inner layer material; a connecting catheter carrying electrical wires; a transducer coupled to the electrical wires and in communication with the pressure transmitting medium to provide a pressure signal representing variations in the physiologic pressure on the electrical wires; signal processing circuitry coupled to the electrical wires to process the pressure signal; and a housing holding the signal processing circuitry, wherein the transducer is remote from the housing. - View Dependent Claims (23, 24)
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25. An apparatus for measuring physiological pressure comprising:
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a pressure transmission catheter filled entirely with a pressure transmitting gel and implantable in an area having a physiological pressure; a connecting catheter carrying electrical wires; a transducer coupled to the electrical wires and in communication with the pressure transmitting gel to provide a pressure signal representing variations in the physiologic pressure on the electrical wires; signal processing and telemetry circuitry coupled to the electrical wires to receive the pressure signal and provide a telemetry signal representing the pressure signal; and a housing holding the signal processing and telemetry circuitry and the transducer. - View Dependent Claims (26, 27)
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28. An apparatus for measuring physiological pressure comprising:
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a pressure transmission catheter filled with a pressure transmitting medium and implantable in an area having a physiological pressure, the pressure transmission catheter including; a lumen filled with the pressure transmitting medium, a first layer of a first material surrounding the lumen, and at least one additional layer that includes at least one material that is different from the first material, the at least one additional layer surrounding the first layer, wherein the first material has a different hardness than at least one material in the at least one additional layer; a connecting catheter carrying electrical wires; a transducer coupled to the electrical wires and in communication with the pressure transmitting medium to provide a pressure signal representing variations in the physiologic pressure on the electrical wires; and signal processing and telemetry circuitry coupled to the electrical wires to receive the pressure signal and provide a telemetry signal representing the pressure signal. - View Dependent Claims (29, 30, 31, 32, 33)
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34. An apparatus for measuring physiological pressure comprising:
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a pressure transmission catheter filled with a pressure transmitting medium and having a distal tip for placement in an area having a physiological pressure and a proximal end, wherein a distance between the distal tip and the proximal end is sufficiently short to avoid significant head pressure artifact and provide sufficient dynamic response yet sufficiently long to accommodate surgical limitations and tolerance concerns; the pressure transmission catheter including; a lumen filled with the pressure transmitting medium, a first layer of a first material surrounding the lumen, and at least one additional layer that includes at least one material that is different from the first material, the at least one additional layer surrounding the first layer, wherein the first material has a different hardness than at least one material in the at least one additional layer; a connecting catheter carrying electrical wires; a transducer coupled to the electrical wires and in communication with the pressure transmitting medium at the proximal end of the pressure transmission catheter to provide a pressure signal representing variations in the physiologic pressure on the electrical wires; and signal processing circuitry coupled to the electrical wires to process the pressure signal. - View Dependent Claims (35, 36, 37, 38, 39)
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Specification