US4520819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tourniquet with differential pressure occlusion detector
Assignee: Zimmer Surgical Inc
•
Filing: 1983-04-15
•
Granted: 1985-06-04
•
Expires: 2003-04-15
Abstract
Abstract An automatic tourniquet with an improved occlusion detector. A pump and valve for inflating and deflating a tourniquet cuff are connected to a first port. A pressure transducer for sensing the pressure in the cuff is connected to a second port. A pair of pressure differential switches, which activate an alarm when a pressure difference developes across them, are connected anti-parallelly between the pump/valve and the transducer. The differential switches also deactivate the pump/valve upon detection of an occlusion.
Inventors
- 👤 Michael J. Birmingham
- 👤 Michael R. Manes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:18
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/12; A61B17/132; A61B17/135; A61B17/1355; A61H; A61H2201/00; A61H2201/50; A61H2201/5058; A61H2201/5071; A61H2201/5074
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
85 words
A pneumatic tourniquet comprising: a first means for inflating and deflating a tourniquet cuff, said means having a first port for connection to said cuff; a second means for sensing the pressure in said cuff, said means having a second port for connection to said cuff; a pair of pressure differential switches connected anti-parallelly between said first and second means for producing a signal indicative of a pressure differential between said first and second means; and means responsive to said signal for producing an alarm.
Claim 2
Dependent Claim
85 words
A pneumatic tourniquet comprising: a first means for inflating and deflating a tourniquet cuff, said means having a first port for connection to said cuff; a second means for sensing the pressure in said cuff, said means having a second port for connection to said cuff; a pair of pressure differential switches connected anti-parallelly between said first and second means for producing a signal indicative of a pressure differential between said first and second means; and means responsive to said signal for producing an alarm.
Claim 3
Dependent Claim
32 words
A pneumatic tourniquet as in claim 1 wherein said pressure differential switches produce a signal when the magnitude of said pressure difference between said first and second means exceeds a predetermined amount.
Claim 4
Dependent Claim
18 words
A pneumatic tourniquet as in claim 2 wherein said predetermined about is between 20 mmHg and 40 mmHg.
Claim 5
Dependent Claim
25 words
A pneumatic tourniquet as in claim 1 and further comprising means responsive to said signal for deactivating said means for inflating and deflating said cuff.
References Cited (Backward Citations)
GB2085198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |