US4311587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter arrangement denying bacteria entry to peritoneum
Assignee: Japan Foundation for Artificial Organs
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Filing: 1979-12-10
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Granted: 1982-01-19
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Expires: 1999-12-10
Abstract
Abstract A filter connection for peritoneal dialysis is presented including, in a flow line from a source of fresh dialysate solution carried on the patient's body, and under pressure, through a bacteria filter of sub-micron porosity for removing microorganisms generally greater than about 0.2 microns (nominal size) together with tubular connections leading from the filter toward a catheter inserted in the patient's peritoneum including in order from the filter, a first check valve permitting flow only away from the filter, then an outflow port with check valve permitting used dialysis flow only away from the patient, and finally the connection to the catheter tube.
Inventors
- 👤 Yukihiko Nose
- 👤 Paul S. Malchesky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:50
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/14; A61M1/28; A61M1/16; A61M1/1654; A61M1/1656; A61M1/1672; A61M1/281; A61M1/285; A61M2202/00; A61M2202/20; A61M2202/203
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
128 words
A filter connection for peritoneal dialysis comprising a sub-micron bacteria filter for removing sub-micron particles between about greater than 0.2 μm size, means to connect a pressurized source of fresh dialysate solution carried by the wearer to the upstream end of said filter, a tubular connection at the downstream end of said filter, a coacting first check valve in said tubular connection permitting flow only away from said filter, an outflow port communicating with said tubular connection downstream from said first check valve and independent of said filter, there being the equivalent of a second check valve in communication with said outflow port permitting flow only away from said port, and means for attaching to said tubular connection a catheter tube communicating with the peritoneum of a patient.
Claim 2
Dependent Claim
128 words
A filter connection for peritoneal dialysis comprising a sub-micron bacteria filter for removing sub-micron particles between about greater than 0.2 μm size, means to connect a pressurized source of fresh dialysate solution carried by the wearer to the upstream end of said filter, a tubular connection at the downstream end of said filter, a coacting first check valve in said tubular connection permitting flow only away from said filter, an outflow port communicating with said tubular connection downstream from said first check valve and independent of said filter, there being the equivalent of a second check valve in communication with said outflow port permitting flow only away from said port, and means for attaching to said tubular connection a catheter tube communicating with the peritoneum of a patient.
Claim 3
Dependent Claim
23 words
A filter connection for peritoneal dialysis as defined in claim 1 so arranged as to be mounted upon the body of a patient.
Claim 4
Dependent Claim
31 words
A filter connection for peritoneal dialysate as defined in claim 1 wherein said filter is lightweight and is of plastic and is flat in that its thickness is its minimum dimension.
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) | 1985-01-18 | 1985-07-20 | 1986-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-18 | 1989-07-20 | 1990-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-18 | 1993-07-20 | 1994-01-19 | $7700.00 | Window Closed / Lapsed |