US4825876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encapsulated blood pressure transducer
Assignee: Hospira Inc
•
Filing: 1988-02-23
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Granted: 1989-05-02
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Expires: 2008-02-23
Abstract
Abstract An apparatus and method for providing a blood pressure transducer suitable for use in a catheter line, for monitoring blood pressure. Two embodiments of the blood pressure transducer (20, 120) are disclosed, both of which include connectors (24) suitable for connection to a catheter line. A flow-through passage (22) extends between the two connectors, in fluid communication with a solid-state pressure transducer chip (36), which is mounted on a chip carrier (34) inside a rectangular-shaped plastic housing (30/130, 32). The chip carrier includes a plurality of formed flat leads (38) connected to the pressure transducer chip, and an extending nib (62) having a passage (66) filled with a silicon gel (64), which couples fluid pressure in the flow-through passage to a pressure sensitive diaphragm (106) on the solid-state pressure transducer chip. Electrical signals are transmitted to and from the pressure transducer chip through a multiconductor lead (40) having a plurality of conductors (42), which make electrical contact with the formed flat leads during assembly of the housing. Use of the preassembled chip carrier and of a solid-state pressure transducer chip which includes its own thermal compensation circuit greatly reduces the assembly cost of the blood pressure transducer.
Inventors
- 👤 Robert W. Beard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:03
CPC Classifications
G; G01; G01L; G01L19/00; G01L19/14; G01L19/142; G01L19/143; A; A61; A61B; A61B5/00; A61B5/02; A61B5/021; A61B5/0215; G01L19/0061; G01L19/0084; G01L19/147; G01L9/00; G01L9/0041; G01L9/0051; G01L9/0052; G01L9/0054; Y; Y10; Y10S; Y10S439/00; Y10S439/93
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
278 words
Apparatus for measuring fluid pressure in a fluid line, comprising: (a) a pressure transducer comprising a semiconductor circuit on which are disposed a plurality of electrical contacts, and a pressure sensitive surface, said pressure sensitive surface experiencing a strain as a pressure is applied thereto, the strain causing the pressure transducer to produce an output signal, which varies as a function of the pressure, through the plurality of electrical contacts disposed on the semiconductor circuit; (b) a housing defining a cavity in which the pressure transducer is disposed and including a connector adapted to attach to the fluid line, the housing further including a fluid passage extending through the housing, proximate to the pressure sensitive surface of the pressure transducer and providing communication of fluid pressure between the connector and said pressure sensitive surface; (c) a plurality of insulated electrical conductors through which electrical signals are conveyed to and from the pressure transducer; and (d) an integrally formed chip carrier mounted in the cavity, said pressure transducer being attached to the chip carrier, said chip carrier including: (i) a fluid interface between the fluid passage and the pressure transducer, said interface including means for transmitting fluid pressure between the fluid passage and the pressure sensitive surface; (ii) a quick-connect electrical interface between the plurality of electrical conductors and the plurality of electrical contacts on the semiconductor circuit of the pressure transducer; and, (iii) means for sealing the pressure transducer within the cavity so that one side of the pressure sensitive surface is exposed to the means for transmitting fluid pressure and so that the opposite side thereof is isolated from the fluid passage and the fluid pressure therein.
Claim 2
Dependent Claim
278 words
Apparatus for measuring fluid pressure in a fluid line, comprising: (a) a pressure transducer comprising a semiconductor circuit on which are disposed a plurality of electrical contacts, and a pressure sensitive surface, said pressure sensitive surface experiencing a strain as a pressure is applied thereto, the strain causing the pressure transducer to produce an output signal, which varies as a function of the pressure, through the plurality of electrical contacts disposed on the semiconductor circuit; (b) a housing defining a cavity in which the pressure transducer is disposed and including a connector adapted to attach to the fluid line, the housing further including a fluid passage extending through the housing, proximate to the pressure sensitive surface of the pressure transducer and providing communication of fluid pressure between the connector and said pressure sensitive surface; (c) a plurality of insulated electrical conductors through which electrical signals are conveyed to and from the pressure transducer; and (d) an integrally formed chip carrier mounted in the cavity, said pressure transducer being attached to the chip carrier, said chip carrier including: (i) a fluid interface between the fluid passage and the pressure transducer, said interface including means for transmitting fluid pressure between the fluid passage and the pressure sensitive surface; (ii) a quick-connect electrical interface between the plurality of electrical conductors and the plurality of electrical contacts on the semiconductor circuit of the pressure transducer; and, (iii) means for sealing the pressure transducer within the cavity so that one side of the pressure sensitive surface is exposed to the means for transmitting fluid pressure and so that the opposite side thereof is isolated from the fluid passage and the fluid pressure therein.
Claim 3
Dependent Claim
50 words
The apparatus of claim 1, wherein the quick-connect electrical interface of the chip carrier includes a plurality of leads connected to the electrical contacts on the semiconductor circuit of the pressure transducer, and wherein the leads are formed in a "U" shape and engage the electrical conductors by spring force.
Claim 4
Dependent Claim
38 words
The apparatus of claim 2, wherein a bond area at an end of each lead is disposed on the carrier proximate the pressure transducer and is connected to the electrical contacts on the semiconductor circuit with fine wires.
Claim 5
Dependent Claim
45 words
The apparatus of claim 1, wherein the chip carrier comprises a generally planar surface, having a recess formed therein in which the pressure transducer is mounted, and an aperture formed in the recess over which the pressure sensitive surface of the pressure transducer is disposed.
Claim 6
Dependent Claim
43 words
The apparatus of claim 4, wherein the recess includes a shelf on which is disposed a plurality of lead bond areas, said bond areas being connected to a plurality of leads that extend from the chip carrier and outwardly of an end thereof.
Claim 7
Dependent Claim
49 words
The apparatus of claim 4, wherein a nib projects from a surface of the chip carrier opposite that in which the recess is formed, said nib being disposed around the aperture and extending into engagement with a receptacle formed in the housing, in fluid communication with the fluid passage.
Claim 8
Dependent Claim
26 words
The apparatus of claim 6, wherein said means for transmitting fluid pressure comprises a substantially incompressible gel, and wherein the nib is filled with the gel.
Claim 9
Dependent Claim
49 words
The apparatus of claim 1, wherein the housing comprises a first section on which the electrical conductors are terminated and a second section on which the connector is disposed, said first and second sections being sealingly joined after the chip carrier and pressure transducer are mounted in the cavity.
Claim 10
Dependent Claim
25 words
The apparatus of claim 1, wherein the pressure transducer comprises a piezoresistive type transducer, including a plurality of resistors connected in a Wheatstone bridge configuration.
Claim 11
Dependent Claim
20 words
The apparatus of claim 9, wherein the semiconductor circuit further comprises means for temperature compensating the resistance of the resistors.
Claim 12
Dependent Claim
45 words
The apparatus of claim 1, wherein the insulated electrical conductors include a resistor, which is connected in parallel with the output signal from the pressure transducer to reduce the apparent impedance of the pressure transducer relative to a device connected to monitor its output signal.
Claim 13
Dependent Claim
268 words
In a catheter system, a pressure sensing apparatus adapted to attach to a catheter and operative to produce an electrical signal indicative of the magnitude of fluid pressure in the catheter, said apparatus comprising: (a) pressure sensing means, including a first and a second surface, for sensing a differential fluid pressure applied between the first surface and the second surface thereof and producing an electrical signal indicative of the magnitude of the fluid pressure, said second surface thereof including contact means for connecting the electrical signal to a plurality of discrete conductors; (b) housing means for enclosing the pressure sensing means, including: (i) connector means for providing a sealed connection to a line in fluid communication with the catheter system, (ii) passage means for conveying a fluid from the connector means to a point within the housing means proximate the first surface of the pressure sensing means, and (iii) an electrical cable for conveying the electrical signal from the pressure sensing apparatus; and (c) carrier means, disposed within the housing means, for: (i) integrally defining a sealed aperture disposed between the first surface of the pressure sensing means and the passage means, including pressure transmitting means disposed in the aperture for transmitting fluid pressure from the fluid in the passage means to the first surface of the pressure sensing means, (ii) mounting the pressure sensing means within the housing means in sealed relationship with the fluid passage means, and (iii) conducting the electrical signal from the plurality of discrete conductors to the electrical cable through a plurality of spring biased leads, which are disposed on the carrier means.
Claim 14
Dependent Claim
268 words
In a catheter system, a pressure sensing apparatus adapted to attach to a catheter and operative to produce an electrical signal indicative of the magnitude of fluid pressure in the catheter, said apparatus comprising: (a) pressure sensing means, including a first and a second surface, for sensing a differential fluid pressure applied between the first surface and the second surface thereof and producing an electrical signal indicative of the magnitude of the fluid pressure, said second surface thereof including contact means for connecting the electrical signal to a plurality of discrete conductors; (b) housing means for enclosing the pressure sensing means, including: (i) connector means for providing a sealed connection to a line in fluid communication with the catheter system, (ii) passage means for conveying a fluid from the connector means to a point within the housing means proximate the first surface of the pressure sensing means, and (iii) an electrical cable for conveying the electrical signal from the pressure sensing apparatus; and (c) carrier means, disposed within the housing means, for: (i) integrally defining a sealed aperture disposed between the first surface of the pressure sensing means and the passage means, including pressure transmitting means disposed in the aperture for transmitting fluid pressure from the fluid in the passage means to the first surface of the pressure sensing means, (ii) mounting the pressure sensing means within the housing means in sealed relationship with the fluid passage means, and (iii) conducting the electrical signal from the plurality of discrete conductors to the electrical cable through a plurality of spring biased leads, which are disposed on the carrier means.
Claim 15
Dependent Claim
62 words
The apparatus of claim 12, wherein the electrical cable comprises a plurality of insulated wires, each wire being stripped of insulation at an end portion that is terminated in the housing means, said leads in the carrier means being formed in a "U" shaped loop that is spring biased to engage the end portions of the wires, forming a conductive contact therewith.
Claim 16
Dependent Claim
41 words
The apparatus of claim 12, wherein the housing means comprise a first and a second section, opposed mating surfaces of the first and the second section defining therebetween a cavity in which the carrier means and pressure sensing means are disposed.
Claim 17
Dependent Claim
29 words
The apparatus of claim 14, wherein the first section of the housing means is attached to the electrical cable and the second section is attached to the connector means.
Claim 18
Dependent Claim
58 words
The apparatus of claim 14, wherein the pressure sensing means are mounted on the carrier means and the plurality of discrete conductors are attached between the spring biased leads and the contact means forming an assembly, and wherein said assembly is sealed into the cavity by mating the first section of the housing means to the second section.
Claim 19
Dependent Claim
40 words
The apparatus of claim 14, wherein the carrier means include a nib disposed around said aperture proximate the first surface of the pressure sensing means and projecting into the passage means, said pressure transmitting means being disposed within said nib.
Claim 20
Dependent Claim
35 words
The apparatus of claim 17, wherein the pressure transmitting means comprise a substantially incompressible gel, which seals the aperture, preventing fluid communication between the passage means and the first surface of the pressure sensing means.
Claim 21
Dependent Claim
45 words
The apparatus of claim 17, wherein the housing means include an adhesive channel, said first and second sections of the housing means being joined with an adhesive, said adhesive flowing through the adhesive channel to join and the seal the nib to the housing means.
Claim 22
Dependent Claim
40 words
The apparatus of claim 12, wherein the pressure sensing means comprise a thin film semiconductor circuit disposed on the periphery of the second surface and a pressure sensitive diaphragm disposed on the center of the first and the second surfaces.
Claim 23
Independent Claim
226 words
A method for assembling a pressure sensing device useful for measuring pressure in a catheter system, said pressure sensing device including a pressure transducer having a pressure sensing surface and a plurality of electrical contacts, a chip carrier, an electrical cable including a plurality of conductors, and a housing, comprising the steps of: (a) attaching the pressure transducer to the chip carrier; (b) bonding wires to the electrical contacts and to a plurality of lead areas disposed on the chip carrier, providing an electrically conductive path therebetween; (c) forming a plurality of leads that are attached to the chip carrier, generally into a "U" shape; (d) filling an aperture disposed on the clip carrier adjacent the pressure sensing surface of the pressure transducer with a substantially incompressible gel; (e) mounting the chip carrier with the pressure transducer attached in a recess formed in a first portion of the housing, with the aperture in fluid communication with a catheter connector formed on the housing, said catheter connector adapting the housing for connection to the catheter system; (f) positioning the cable in an opening formed within the housing so that the formed leads engage the plurality of conductors in the electrical cable; and (g) securing a second portion of the housing to the first portion, so that the pressure transducer and chip carrier are sealed within the housing.
Claim 24
Independent Claim
226 words
A method for assembling a pressure sensing device useful for measuring pressure in a catheter system, said pressure sensing device including a pressure transducer having a pressure sensing surface and a plurality of electrical contacts, a chip carrier, an electrical cable including a plurality of conductors, and a housing, comprising the steps of: (a) attaching the pressure transducer to the chip carrier; (b) bonding wires to the electrical contacts and to a plurality of lead areas disposed on the chip carrier, providing an electrically conductive path therebetween; (c) forming a plurality of leads that are attached to the chip carrier, generally into a "U" shape; (d) filling an aperture disposed on the clip carrier adjacent the pressure sensing surface of the pressure transducer with a substantially incompressible gel; (e) mounting the chip carrier with the pressure transducer attached in a recess formed in a first portion of the housing, with the aperture in fluid communication with a catheter connector formed on the housing, said catheter connector adapting the housing for connection to the catheter system; (f) positioning the cable in an opening formed within the housing so that the formed leads engage the plurality of conductors in the electrical cable; and (g) securing a second portion of the housing to the first portion, so that the pressure transducer and chip carrier are sealed within the housing.
Claim 25
Dependent Claim
56 words
The method of claim 21, wherein the aperture is defined by a projecting nib disposed on the chip carrier, the step of mounting the chip carrier in a first portion of the housing including the step of seating the projecting nib into a mating receptacle formed on the interior of the first portion of the housing.
Claim 26
Dependent Claim
15 words
The method of claim 22, wherein the projecting nib is filled with the incompressible gel.
Claim 27
Dependent Claim
22 words
The method of claim 21, wherein the second portion of the housing is secured to the first portion thereof with an adhesive.
Claim 28
Dependent Claim
86 words
Apparatus for mounting a pressure transducer comprising: (a) a baseplate having a recessed portion on which a generally planar surface is formed, said recessed portion including an aperture that extends through the baseplate; (b) a plurality of electrically conductive leads that extend outwardly from an end of the baseplate, into the recessed portion; and (c) a lead bond area disposed within the recessed portion, on which is terminated an end of each of the leads that are adapted to be electrically connected to the pressure transducer.
Claim 29
Dependent Claim
86 words
Apparatus for mounting a pressure transducer comprising: (a) a baseplate having a recessed portion on which a generally planar surface is formed, said recessed portion including an aperture that extends through the baseplate; (b) a plurality of electrically conductive leads that extend outwardly from an end of the baseplate, into the recessed portion; and (c) a lead bond area disposed within the recessed portion, on which is terminated an end of each of the leads that are adapted to be electrically connected to the pressure transducer.
Claim 30
Dependent Claim
38 words
The apparatus of claim 25, wherein the baseplate is adapted to mount the pressure transducer in an automated process by its attachment to a thin flexible strip in which a plurality of similar baseplates are attached and carried.
Claim 31
Dependent Claim
18 words
The apparatus of claim 26, wherein the baseplate is attached to the thin flexible strip during its manufacture.
Claim 32
Dependent Claim
24 words
The apparatus of claim 26, wherein the plurality of electrically conductive leads are formed from the thin, flexible strip during manufacture of the apparatus.
Claim 33
Dependent Claim
30 words
The apparatus of claim 25, wherein the aperture extends through a nib that projects outwardly of the baseplate, and which is adapted to be filled with a substantially incompressible gel.
Claim 34
Dependent Claim
55 words
The apparatus of claim 25, wherein the lead bond area is disposed on a shelf formed in the recessed portion of the baseplate, and the leads extend through the baseplate, the ends of the leads being plated with a precious metal of relatively higher electrical conductivity than a metal from which the leads are formed.
Claim 35
Dependent Claim
31 words
The apparatus of claim 25, wherein the baseplate is generally rectangular in shape and comprises a top portion and a bottom portion disposed on opposite surfaces of the thin flexible strip.
References Cited (Backward Citations)
US4539998A
Cited
US4557269A
Cited
US4576181A
Cited
US4589287A
Cited
US4610256A
Cited
US4610256B1
Cited
US4679567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |