Disposable pressure transducer apparatus for medical use
First Claim
1. In a direct blood pressure measurement system having a monitor device coupled to an indwelling, fluid-filling catheter adapted to be inserted into a patient, a disposable pressure transducer apparatus with a dielectric substrate having first and second sides and a pressure transducer having a piezoresistive pressure diaphragm secured to said first side of said substrate, said apparatus comprising:
- means circuit for temperature compensation provided on said first side of said substrate, said circuit means being electrically connected to said pressure diaphragm;
means for electrically connecting said circuit means for temperature compensation and said pressure transducer to said monitor device, said connecting means being attached to said circuit means and said pressure transducer on said first side of the substrate;
means for housing said substrate, said housing means comprising a first passageway communicating with said fluid-filled catheter, a second passageway providing fluid communication between said pressure diaphragm and said first passageway, and means for mounting said substrate in said housing means such that said second side of the substrate faces toward said second passageway and said first side of the substrate faces away from said second passageway; and
means for hydraulically coupling said pressure diaphragm through said second passageway to said first passageway and the fluid-filled catheter communicating with said first passageway.
2 Assignments
0 Petitions
Accused Products
Abstract
A novel disposable pressure transducer apparatus for monitoring human blood pressure. The apparatus includes a semiconductor pressure transducer, a temperature compensation circuit, and light shielding structures mounted on a dielectric substrate. The substrate is secured within a housing adapted to follow the pressure pulses present in a fluid filled catheter to be communicated to the pressure transducer by way of a gel placed in a hole provided in the substrate.
146 Citations
25 Claims
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1. In a direct blood pressure measurement system having a monitor device coupled to an indwelling, fluid-filling catheter adapted to be inserted into a patient, a disposable pressure transducer apparatus with a dielectric substrate having first and second sides and a pressure transducer having a piezoresistive pressure diaphragm secured to said first side of said substrate, said apparatus comprising:
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means circuit for temperature compensation provided on said first side of said substrate, said circuit means being electrically connected to said pressure diaphragm; means for electrically connecting said circuit means for temperature compensation and said pressure transducer to said monitor device, said connecting means being attached to said circuit means and said pressure transducer on said first side of the substrate; means for housing said substrate, said housing means comprising a first passageway communicating with said fluid-filled catheter, a second passageway providing fluid communication between said pressure diaphragm and said first passageway, and means for mounting said substrate in said housing means such that said second side of the substrate faces toward said second passageway and said first side of the substrate faces away from said second passageway; and means for hydraulically coupling said pressure diaphragm through said second passageway to said first passageway and the fluid-filled catheter communicating with said first passageway. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. In a direct blood pressure monitoring system having a monitor device coupled to an indwelling, fluid-filled catheter adapted to be inserted into a patient, a disposable pressure transducer apparatus with a dielectric substrate having first and second sides and a pressure transducer having a piezoresistive pressure diaphragm secured to said first side of said substrate, said apparatus comprising:
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circuit means for temperature compensation provide on said first side of said substrate, said means circuit being electrically connected to said pressure diaphragm; means for a housing said substrate, said housing means comprising a first passageway communicating with said fluid-filled catheter, a second passageway providing fluid communication between said pressure diaphragm and said first passageway, and means for mounting said substrate in said housing means such that said second side of the substrate faces toward said second passageway and said first side of the substrate faces away from said second passageway; an electrical cable comprising a plurality of separate electrical conductors, said cable being connected to said housing means and said conductors being attached to said circuit means for temperature compensation and said pressure transducer on said first side of said substrate; means for hydraulically coupling said pressure diaphragm through said second passageway to said first passsageway; and means for forming a fluid-tight seal between said second side of said substrate and the portion of said housing means comprising said second passageway, such that said first side of said substrate together with said pressure transducer and the circuit means for temperature compensation mounted thereon are electrically isolated from said fluid-filled catheter adapted to be inserted into said patient. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. In a direct blood pressure monitoring system having a monitor device coupled to an indwelling, fluid-fille catheter adapted to be inserted into a patient, a disposable pressure transducer apparatus with a dielectric substate having first and second sides and a pressure transducer having a piezoresistive pressure diaphragm secured to said first side of said substrate, said apparatus comprising:
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circuit means for temperature compensation provided on said first side of said substrate, said circuit means being electrically connected to said pressure diaphragm; means for housing said substrate, said housing means comprising a first passageway communicating with said fluid-filled catheter, a second passageway providing fluid communication between said pressure diaphragm and said first passageway, and means for mounting said substrate in said housing means such that said second side of the substrate faces toward said second passageway and said first side of the substrate faces away from said second passageway; means for shielding said pressure transducer from exposure to light, said shielding means comprising an opaque coating formed on at least one of said first and second sides of said substrate and an opaque cap secured to the first side of said substrate so as to cover said pressure transducer, said cap having a hole formed therethrough; an electrical cable comprising a plurality of separate electrical conductors, said cable being connected to said housing means and said conductors being attached to said circuit means for temperature compensation and said pressure transducer on said first side of the substrate, and said cable having a space formed through the interior of said cable, the space through said cable and the hole formed through said cap together providing a means for venting one side of the pressure transducer to atmospheric pressure; and a gel substance which substantially fills said second passageway formed through said housing means, said gel substance being in contact with the other side of said pressure diaphragm and said gel substance also being interposed between said substrate and a portion of said housing means adjacent said second passageway so as to form a fluid-tight seal between said substrate and said housing means.
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Specification