US3908653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blood chamber
Assignee: Vital Assists Inc
•
Filing: 1974-01-23
•
Granted: 1975-09-30
•
Expires: 1994-01-23
Abstract
Abstract A blood chamber for an arterial line of an extracorporeal blood system. The chamber is a flow through device for blood with an air cushion over the blood and access structure for sampling and treating the blood. A pressure tap in the chamber communicates the air cushion with a pressure transducer to facilitate measurement of blood pressure within the chamber. Undesirable obstruction of the pressure tap by blood foam is reduced by introducing blood into the chamber through a submerged inlet. The blood chamber may be situated upstream from a blood pump in a single needle extracorporeal dialysis system so as to avoid pump starvation.
Inventors
- 👤 Donald E Kettering
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:45
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/36; A61M1/3621; A61M1/3627; A61M1/14; A61M1/30; A61M1/301; A61M1/302; A61M1/305; A61M1/306; A61M2205/00; A61M2205/33; A61M2205/3331; A61M2205/3344; A61M2205/3351; Y; Y10; Y10S; Y10S128/00; Y10S128/03
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
179 words
A method for monitoring blood in an arterial line of an extracorporeal blood handling system comprising venous and arterial blood lines, a blood pump and a dialyzer, the improvement comprising: providing a cylindrical blood chamber, the cylindrical configuration minimizing blood stagnation in the chamber; interposing the chamber in an arterial blood line of an extracorporeal blood handling system upstream of the pump, the chamber having means for maintaining a vertical orientation of the chamber; passing blood through a variable volume pool of blood in the chamber from a submerged inlet to a submerged outlet while simultaneously minimizing blood foaming by introducing blood into the chamber through the submerged inlet; inhibiting clot formation in the blood and also enhancing mixing fluids selectively amended to the blood by creating limited subsurface turbulence in the blood, the turbulence being created by introducing the blood into the cylindrical chamber below the blood surface; maintaining a constant quantity gas cushion above the pool of blood in the chamber; and communicating pressure developed in the gas cushion by the blood to a pressure sensing device.
Claim 2
Independent Claim
179 words
A method for monitoring blood in an arterial line of an extracorporeal blood handling system comprising venous and arterial blood lines, a blood pump and a dialyzer, the improvement comprising: providing a cylindrical blood chamber, the cylindrical configuration minimizing blood stagnation in the chamber; interposing the chamber in an arterial blood line of an extracorporeal blood handling system upstream of the pump, the chamber having means for maintaining a vertical orientation of the chamber; passing blood through a variable volume pool of blood in the chamber from a submerged inlet to a submerged outlet while simultaneously minimizing blood foaming by introducing blood into the chamber through the submerged inlet; inhibiting clot formation in the blood and also enhancing mixing fluids selectively amended to the blood by creating limited subsurface turbulence in the blood, the turbulence being created by introducing the blood into the cylindrical chamber below the blood surface; maintaining a constant quantity gas cushion above the pool of blood in the chamber; and communicating pressure developed in the gas cushion by the blood to a pressure sensing device.
Claim 3
Dependent Claim
23 words
A method as defined in claim 1 further comprising sampling blood within the chamber through blood access means formed in a chamber wall.
Claim 4
Dependent Claim
23 words
A method as defined in claim 1 further comprising delivering fluids into the blood in the chamber by accessing through a chamber wall.
Claim 5
Dependent Claim
206 words
A blood pressure and blood treatment access device for an arterial line of a single needle extracorporeal blood handling system which comprises arterial and venous blood lines, a blood pump, a dialyzer down stream from the pump and a controller for determining the direction of blood flow in the single needle, further, comprising: an enclosed cylindrical chamber operable to receive a variable quantity of blood and to maintain a constant quantity gas cushion above said blood; means for maintaining a vertical orientation of the cylindrical chamber; a blood inlet and a blood outlet through a wall of the chamber, each located below a minimum blood level, said inlet and outlet being located upstream from the blood pump of the single needle system to provide a reservoir of blood from which the blood pump can draw even when pressure is periodically reduced in the chamber to thereby avoid pump starvation; and a plurality of access means into the chamber, at least one of which is operable to communicate pressure through the gas cushion to a pressure sensing device, at least one other access means which is in direct communication with the interior of the chamber for sampling blood and introducing fluids into the blood within the chamber.
Claim 6
Dependent Claim
206 words
A blood pressure and blood treatment access device for an arterial line of a single needle extracorporeal blood handling system which comprises arterial and venous blood lines, a blood pump, a dialyzer down stream from the pump and a controller for determining the direction of blood flow in the single needle, further, comprising: an enclosed cylindrical chamber operable to receive a variable quantity of blood and to maintain a constant quantity gas cushion above said blood; means for maintaining a vertical orientation of the cylindrical chamber; a blood inlet and a blood outlet through a wall of the chamber, each located below a minimum blood level, said inlet and outlet being located upstream from the blood pump of the single needle system to provide a reservoir of blood from which the blood pump can draw even when pressure is periodically reduced in the chamber to thereby avoid pump starvation; and a plurality of access means into the chamber, at least one of which is operable to communicate pressure through the gas cushion to a pressure sensing device, at least one other access means which is in direct communication with the interior of the chamber for sampling blood and introducing fluids into the blood within the chamber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |