Patent US5634893A successfully refreshed from Google Patents.
US5634893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Autotransfusion apparatus
Assignee: Haemonetics Corp
•
Filing: 1995-04-24
•
Granted: 1997-06-03
•
Expires: 2015-04-24
Abstract
Abstract An autotransfusion apparatus for collecting salvaged blood includes an upper chamber for collecting blood and a lower chamber for receiving blood from the upper chamber. The upper chamber is subjected to a vacuum to withdraw blood from a patient. Particles and lipids are removed from the collected blood by a particle filter and a lipid separator. A selector valve located between the vacuum port and the lower chamber, and between the lower chamber and a vent, selectively couples lower chamber either to the vacuum source or the vent. The lower chamber receives blood from the upper chamber through a pressure-operated drain valve only when the lower chamber is coupled to the vacuum source. Coupling the lower chamber to the vent while the upper chamber is subjected to the vacuum source causes a pressure differential between the chambers, closing the pressure-operated drain valve. This allows the upper chamber to remain under a vacuum and continuously collect blood while the lower chamber drains blood into a blood bag.
Inventors
- 👤 Michael L. Rishton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:19
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/60; A61M1/63; A61M1/631; A61M1/36; A61M1/3621; A61M1/3627; A61M2205/00; A61M2205/75; A61M2205/7536; A61M2205/7545
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
86 words
Apparatus for collecting and salvaging blood, the apparatus comprising: a. a first chamber for collecting blood; b. an inlet port for admitting blood into the first chamber; c. a second chamber fluidly connected to the first chamber for receiving blood therefrom; d. a vacuum port associated with the first chamber for coupling the first chamber to a vacuum source; and e. a selector valve in fluid communication with the second chamber for alternatively venting the second chamber or coupling the second chamber to the vacuum port.
Claim 2
Dependent Claim
86 words
Apparatus for collecting and salvaging blood, the apparatus comprising: a. a first chamber for collecting blood; b. an inlet port for admitting blood into the first chamber; c. a second chamber fluidly connected to the first chamber for receiving blood therefrom; d. a vacuum port associated with the first chamber for coupling the first chamber to a vacuum source; and e. a selector valve in fluid communication with the second chamber for alternatively venting the second chamber or coupling the second chamber to the vacuum port.
Claim 3
Dependent Claim
15 words
The apparatus of claim 1 wherein the first chamber is located above the second chamber.
Claim 4
Dependent Claim
52 words
The apparatus of claim 2 wherein the first and second chambers are fluidly connected by a drain valve capable of closing when the second chamber is vented while the first chamber is coupled to the vacuum source, the closing of the drain valve allowing the first chamber to remain under a vacuum.
Claim 5
Dependent Claim
27 words
The apparatus of claim 3 wherein the drain valve is pressure-operated, the drain valve closing when subjected to a pressure differential between the first and second chambers.
Claim 6
Dependent Claim
18 words
The apparatus of claim 1 further comprising a filter for filtering particles from blood entering the first chamber.
Claim 7
Dependent Claim
20 words
The apparatus of claim 3 further comprising a lipid separator in the first chamber for separating lipids from the blood.
Claim 8
Dependent Claim
19 words
The apparatus of claim 6 wherein the lipid separator comprises a lipid filter for filtering lipids from the blood.
Claim 9
Dependent Claim
92 words
The apparatus of claim 6 wherein the lipid separator comprises: a. a partition within the first chamber for defining separate portions thereof, the partition having an opening at its lower end that permits blood to pass therethrough; and b. a dam spaced between the partition and the drain valve such that when blood flowing under the partition reaches the height of the dam, the blood flows over the dam and into the drain valve, c. the dam and the partition thereby cooperating to prevent passage of buoyant material into the drain valve.
Claim 10
Dependent Claim
21 words
The apparatus of claim 1 further comprising a transfusion bag in fluid communication with the second chamber for receiving blood therefrom.
Claim 11
Dependent Claim
30 words
The apparatus of claim 1 further comprising: a. an infusion port for infusing fluid into the first chamber; and b. an auxiliary port for admitting fluid into the first chamber.
References Cited (Backward Citations)
US4016077A
Cited
US4033345A
Cited
US4116845A
Cited
US4569674A
Cited
US4475904A
Cited
US4744785A
Cited
US4826494A
Cited
US4655754A
Cited
US4705497A
Cited
US4626248A
Cited
US5203778A
Cited
US4898572A
Cited
US4773897A
Cited
US5100376A
Cited
US4846800A
Cited
US4909780A
Cited
US4870975A
Cited
US5024613A
Cited
US4994022A
Cited
US5270005A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-06-02 | 2000-12-02 | 2001-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-02 | 2004-12-02 | 2005-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-02 | 2008-12-02 | 2009-06-03 | $7700.00 | Window Closed / Lapsed |