Disposable pressure transducer and disposable pressure transducer apparatus
First Claim
1. A disposable pressure transducer for measuring fluid pressure, connectable to external display means for displaying said measured fluid pressure, comprising:
- a housing including a fluid chamber having;
at least one inner wall surface;
an inlet having a given cross-sectional area;
an outlet having a cross-sectional area smaller than said cross-sectional area of said inlet;
a sensor accommodating chamber;
an aperture between said fluid chamber and said sensor accommodating chamber; and
said at least one inner wall surface of said fluid chamber being hydrophilic;
said fluid chamber and said sensor accommodating chamber being formed integrally with each other;
a sensor assembly mounted in said sensor accommodating chamber having;
an insulating board;
a semiconductor sensor chip mounted on said insulating board for converting pressure into a sensor output signal;
integrated circuit means mounted on said insulating board for processing said sensor output signal into a pressure signal;
a cylindrical coupling lid having an interior and a mouth leading into said interior, said coupling lid being mounted in said aperture and on said insulating board to surround said semiconductor sensor chip;
said mouth of said coupling lid having a selected cross-sectional area;
a pressure transmitting medium in said interior of said coupling lid to provide electrical insulation between said fluid chamber and said semiconductor sensor chip;
electrical connector means for electrically connecting said insulating board to said external display means;
said semiconductor sensor chip including a diaphragm portion having a preselected cross-sectional area; and
the ratio of said selected cross-sectional area of said mouth of said lid to said predetermined cross-sectional area of said diaphragm being at least 5;
1.
1 Assignment
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Accused Products
Abstract
A disposable pressure transducer for measuring fluid pressure, which includes a sensor assembly in a housing. The housing includes a fluid chamber and a sensor-accommodating chamber which are formed integrally with each other. The sensor assembly comprises: a sensor chip for converting pressure into an electrical signal; an insulating board on which the sensor chip is mounted and which is provided with an integrated-circuit for processing an output signal of the sensor chip so that an external measuring device can read the signal; a cylindrical coupling lid which is bonded to the board in such a manner as to surround the sensor chip and which is fitted into a communication through-hole which provides communication between the fluid chamber and the sensor-accommodating chamber of the housing; a pressure-transmitting medium charged into the interior of the coupling lid so as to provide electrical insulation between the fluid chamber and the sensor chip; and an electrical cable connected to the board and electrically connected to the external measuring device.
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Citations
9 Claims
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1. A disposable pressure transducer for measuring fluid pressure, connectable to external display means for displaying said measured fluid pressure, comprising:
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a housing including a fluid chamber having; at least one inner wall surface; an inlet having a given cross-sectional area; an outlet having a cross-sectional area smaller than said cross-sectional area of said inlet; a sensor accommodating chamber; an aperture between said fluid chamber and said sensor accommodating chamber; and said at least one inner wall surface of said fluid chamber being hydrophilic; said fluid chamber and said sensor accommodating chamber being formed integrally with each other; a sensor assembly mounted in said sensor accommodating chamber having; an insulating board; a semiconductor sensor chip mounted on said insulating board for converting pressure into a sensor output signal; integrated circuit means mounted on said insulating board for processing said sensor output signal into a pressure signal; a cylindrical coupling lid having an interior and a mouth leading into said interior, said coupling lid being mounted in said aperture and on said insulating board to surround said semiconductor sensor chip; said mouth of said coupling lid having a selected cross-sectional area; a pressure transmitting medium in said interior of said coupling lid to provide electrical insulation between said fluid chamber and said semiconductor sensor chip; electrical connector means for electrically connecting said insulating board to said external display means; said semiconductor sensor chip including a diaphragm portion having a preselected cross-sectional area; and the ratio of said selected cross-sectional area of said mouth of said lid to said predetermined cross-sectional area of said diaphragm being at least 5;
1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification