Patent US5048525A successfully refreshed from Google Patents.
US5048525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blood parameter measurement system with compliant element
Assignee: Terumo Cardiovascular Systems Corp
•
Filing: 1990-06-18
•
Granted: 1991-09-17
•
Expires: 2010-06-18
Abstract
Abstract An assembly for the measurement of a blood parameter comprising a catheter having a lumen extending therethrough and a sensor mounted in the lumen. A conduit couples the lumen to a source of anti-clotting solution, and a compliant element is coupled to the conduit to allow the volume of the introducing system to be expanded and contracted. The compliance of the compliant element can be adjusted to thereby adjust the compliance of the assembly.
Inventors
- 👤 Thomas P. Maxwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:43
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/68; A61B5/6846; A61B5/6847; A61B5/6852; A61B5/145; A61B5/1455; A61B5/1459
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
125 words
An assembly for the measurement of a blood parameter comprising: first means for withdrawing blood from a patient into the first means; said first means comprising a catheter adapted to be received in a patient's cardiovascular system and having a lumen for receiving blood from the patient's cardiovascular system; said first means further comprising means for introducing a fluid into the lumen so as to form a blood-fluid interface in the first means; said first means being compliant whereby the patient's heartbeats tend to move the interface; said first means having a first compliance and a second compliance and comprising means for selecting the first compliance or the second compliance, said first and second compliances being different; and a sensor in communication with the lumen.
Claim 2
Dependent Claim
125 words
An assembly for the measurement of a blood parameter comprising: first means for withdrawing blood from a patient into the first means; said first means comprising a catheter adapted to be received in a patient's cardiovascular system and having a lumen for receiving blood from the patient's cardiovascular system; said first means further comprising means for introducing a fluid into the lumen so as to form a blood-fluid interface in the first means; said first means being compliant whereby the patient's heartbeats tend to move the interface; said first means having a first compliance and a second compliance and comprising means for selecting the first compliance or the second compliance, said first and second compliances being different; and a sensor in communication with the lumen.
Claim 3
Dependent Claim
44 words
An assembly as defined in claim 1 wherein the introducing means has a natural compliance which provides the first compliance and the first means includes a compliant element for use in providing the second compliance, said second compliance being greater than the first compliance.
Claim 4
Dependent Claim
26 words
An assembly as defined in claim 2 including means for selectively switching the compliant element into and out of communication with the lumen of the catheter.
Claim 5
Dependent Claim
33 words
An assembly as defined in claim 1 wherein the first means has a compliant element and means for adjusting the compliance of said compliant element to thereby provide said first and second compliances.
Claim 6
Dependent Claim
37 words
An assembly as defined in claim 4 wherein the compliant element includes an elastic membrane and said adjusting means includes means for limiting maximum elastic movement of the membrane to thereby provide said first and second compliances.
Claim 7
Dependent Claim
25 words
An assembly as defined in claim 5 wherein the limiting means is infinitely adjustable to provide an infinite number of compliances for the introducing means.
Claim 8
Dependent Claim
50 words
An assembly as defined in claim 5 comprising a housing having a passage in communication with the lumen, said membrane being mounted on said housing and said limiting means including a movable member mounted for movement on the housing to provide an adjustable stop for limiting movement of the membrane.
Claim 9
Dependent Claim
136 words
An assembly for the in vivo measurement of a blood parameter comprising: a catheter comprising a lumen extending therethrough, a proximal end, a distal end and a distal opening at the distal end, said catheter being adapted to be received in a patient's cardiovascular system; a sensor for sensing the blood parameter and providing a signal in response thereto; means for mounting the sensor on the catheter with the sensor being within the lumen; a conduit for coupling the lumen to a source of fluid whereby the fluid can be supplied to the lumen; a compliant element coupled to said conduit to allow the volume of the assembly to be expanded and contracted; said compliant element including a membrane; and means for adjustably limiting movement of the membrane to adjust the compliance of the compliant element.
Claim 10
Dependent Claim
136 words
An assembly for the in vivo measurement of a blood parameter comprising: a catheter comprising a lumen extending therethrough, a proximal end, a distal end and a distal opening at the distal end, said catheter being adapted to be received in a patient's cardiovascular system; a sensor for sensing the blood parameter and providing a signal in response thereto; means for mounting the sensor on the catheter with the sensor being within the lumen; a conduit for coupling the lumen to a source of fluid whereby the fluid can be supplied to the lumen; a compliant element coupled to said conduit to allow the volume of the assembly to be expanded and contracted; said compliant element including a membrane; and means for adjustably limiting movement of the membrane to adjust the compliance of the compliant element.
Claim 11
Dependent Claim
120 words
An assembly for the measurement of a blood parameter comprising: first means for withdrawing blood from a patient into the first means; said first means comprising a catheter adapted to be received in a patient's cardiovascular system and having a lumen for receiving blood from the patient's cardiovascular system; said first means further comprising means for introducing a fluid into the lumen so as to form a blood-fluid interface in the first means; said first means having a natural compliance whereby the patient's heartbeats tend to move the interface; said first means further comprising compliance means for providing the introducing means with a plurality of different compliances other than said natural compliance; and a sensor in communication with the lumen.
Claim 12
Dependent Claim
120 words
An assembly for the measurement of a blood parameter comprising: first means for withdrawing blood from a patient into the first means; said first means comprising a catheter adapted to be received in a patient's cardiovascular system and having a lumen for receiving blood from the patient's cardiovascular system; said first means further comprising means for introducing a fluid into the lumen so as to form a blood-fluid interface in the first means; said first means having a natural compliance whereby the patient's heartbeats tend to move the interface; said first means further comprising compliance means for providing the introducing means with a plurality of different compliances other than said natural compliance; and a sensor in communication with the lumen.
Claim 13
Dependent Claim
45 words
An assembly as defined in claim 9 wherein the introducing means includes a conduit communicable with the lumen of the catheter and the compliance means includes an elastic membrane and means for adjustably limiting movement of the membrane to provide said plurality of different compliances.
Claim 14
Independent Claim
88 words
A method of sensing a parameter of blood comprising: withdrawing blood from a patient into an elongated passage of a system having a plurality of different compliances; introducing an anti-clotting solution into the passage to provide an interface between the blood and the solution; selecting one of said compliances; moving the interface back and forth in the passage with the system having said one compliance, said step of moving including allowing the patient's heartbeats to move the interface; and sensing a parameter of the blood in the passage.
Claim 15
Independent Claim
88 words
A method of sensing a parameter of blood comprising: withdrawing blood from a patient into an elongated passage of a system having a plurality of different compliances; introducing an anti-clotting solution into the passage to provide an interface between the blood and the solution; selecting one of said compliances; moving the interface back and forth in the passage with the system having said one compliance, said step of moving including allowing the patient's heartbeats to move the interface; and sensing a parameter of the blood in the passage.
Claim 16
Dependent Claim
51 words
A method as defined in claim 11 wherein said different compliances include a natural compliance of the system, wherein there is a compliant element in said system for use in providing a second of said compliances, and wherein said step of selecting includes selecting said natural compliance or said second compliance.
Claim 17
Dependent Claim
55 words
A method as defined in claim 11 wherein said different compliances include a natural compliance of the system, wherein there is a compliant element in said system for use in providing a plurality of other different compliances, and wherein said step of selecting includes using said compliant element to provide one of said other compliances.
References Cited (Backward Citations)
US2629399A
Cited
US3433935A
Cited
US3512517A
Cited
US3461856A
Cited
US3498286A
Cited
US3529591A
Cited
US3616409A
Cited
US3612866A
Cited
US3658053A
Cited
US3674013A
Cited
DE2215984A1
Cited
US3814081A
Cited
US3866599A
Cited
US3807390A
Cited
US4008717A
Cited
US3878830A
Cited
US3841308A
Cited
US3893448A
Cited
US4016864A
Cited
US3983864A
Cited
USRE31879E
Cited
US4073297A
Cited
US4050450A
Cited
US4322164A
Cited
US4295470A
Cited
US4265249A
Cited
US4201222A
Cited
GB1593270A
Cited
US4200110A
Cited
US4187856A
Cited
US4274417A
Cited
US4210029A
Cited
US4340615A
Cited
US4478222A
Cited
US4311137A
Cited
US4471765A
Cited
US4398542A
Cited
US4407290B1
Cited
US4407290A
Cited
US4476870A
Cited
US4585007A
Cited
US4476877A
Cited
WO1984001109A1
Cited
US4557900A
Cited
US4502488A
Cited
US4508123A
Cited
US4535786A
Cited
US4573968A
Cited
US4640820A
Cited
US4543961A
Cited
US4608996A
Cited
US4601706A
Cited
US4651741A
Cited
US4810655A
Cited
US4684245A
Cited
US4736748A
Cited
US4774955A
Cited
US4718423A
Cited
EP0276977A2
Cited
US4830013A
Cited
US4934369A
Cited
US4832034A
Cited
US4785814A
Cited
US4941475A
Cited
US4974592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-09-16 | 1995-03-18 | 1995-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-16 | 1999-03-18 | 1999-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-16 | 2003-03-18 | 2003-09-17 | $7700.00 | Window Closed / Lapsed |