Patent US4598733A successfully refreshed from Google Patents.
US4598733A
Expired / Lapsed
US
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Apparatus for detecting the volume of blood in a blood reservoir
Assignee: Terumo Corp
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Filing: 1985-05-21
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Granted: 1986-07-08
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Expires: 2005-05-21
Abstract
Abstract In combination with a blood reservoir, a blood volume detecting apparatus is used to ensure safe operation of the reservoir which includes a conduit in fluid communication with a lower part of said blood reservoir, a diaphragm associated with the other end of the conduit and movable by a differential hydraulic pressure applied by the blood through the conduit, and means for detecting the swelling and contracting movement of the diaphragm.
Inventors
- 👤 Michio Kanno
- 👤 Atsuhiko Nogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:27
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/36; A61M1/3621; A61M1/3624; G; G01; G01F; G01F17/00; G01F23/00; G01F23/14; G01F23/16; Y; Y10; Y10S; Y10S128/00; Y10S128/03; Y10S128/13; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7339; Y10T137/7349
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
135 words
An apparatus for detecting the volume of blood in a closed-type blood reservoir, comprising: a conduct having one end in fluid communication with a lower part of said blood reservoir; a membrane associated with the other end of the conduit, said membrane being set at a selected given height relative to said blood reservoir, and said membrane being deformable by a differential hydraulic pressure directly applied by the blood in said blood reservoir through the conduit, said differential hydraulic pressure being a function of the height of said membrane relative to said blood reservoir; said conduit being filled with blood so that the space between said membrane and said blood reservoir is filled with blood; and means for detecting a deformation of said membrane to thereby detect a volume of blood in said blood reservoir.
Claim 2
Independent Claim
135 words
An apparatus for detecting the volume of blood in a closed-type blood reservoir, comprising: a conduct having one end in fluid communication with a lower part of said blood reservoir; a membrane associated with the other end of the conduit, said membrane being set at a selected given height relative to said blood reservoir, and said membrane being deformable by a differential hydraulic pressure directly applied by the blood in said blood reservoir through the conduit, said differential hydraulic pressure being a function of the height of said membrane relative to said blood reservoir; said conduit being filled with blood so that the space between said membrane and said blood reservoir is filled with blood; and means for detecting a deformation of said membrane to thereby detect a volume of blood in said blood reservoir.
Claim 3
Dependent Claim
41 words
A blood volume detecting apparatus according to claim 1 wherein said detecting means includes: a detector for detecting the movement of the membrane to produce an output; and an alarm which is actuated in response to the output of the detector.
Claim 4
Dependent Claim
18 words
A blood volume detecting apparatus according to claim 2 wherein said detector comprises light emitting and sensing elements.
Claim 5
Dependent Claim
54 words
A blood volume detecting apparatus according to claim 1 wherein said detecting means comprises: a detector for detecting the movement of the membrane to produce an output; and control means which is actuated in response to the output of the detector to control the flow of blood into and out of the blood reservoir.
Claim 6
Dependent Claim
18 words
A blood volume detecting apparatus according to claim 4 wherein said detector comprises light emitting and sensing elements.
Claim 7
Dependent Claim
21 words
A blood volume detecting apparatus according to claim 1 wherein said membrane is comprised of a bag connected to the conduit.
Claim 8
Dependent Claim
21 words
A blood volume detecting apparatus according to claim 1 wherein said membrane is combined with a casing affixed to the conduit.
Claim 9
Dependent Claim
28 words
A blood volume detecting apparatus according to claim 7 wherein said casing is a tapered casing having an open end to which the membrane is secured and sealed.
Claim 10
Dependent Claim
47 words
A blood volume detecting apparatus according to claim 8, wherein said casing is a cup-shaped casing including: a curved concave wall, a port connectable to the conduit to provide fluid communication between the casing interior and the conduit, and a flange to which the membrane is secured.
Claim 11
Dependent Claim
37 words
A blood volume detecting apparatus according to claim 9, wherein said membrane is circular and includes: a thick-walled central portion, a thin-walled annular portion surrounding the central portion, and a thick-walled annular flange surrounding the annular portion.
Claim 12
Dependent Claim
23 words
A blood volume detecting apparatus according to claim 1 wherein said conduit is removably connected to the lower part of said blood reservoir.
Claim 13
Dependent Claim
34 words
A blood volume detecting apparatus according to claim 1 wherein the vertical position of the membrane relative to the blood reservoir is variable and resettable, whereby the membrane position provides a movable detection level.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |