Patent US3638639A successfully refreshed from Google Patents.
US3638639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for removing lipids from the human bloodstream
Assignee: Boston Children's Hospital
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Filing: 1970-02-24
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Granted: 1972-02-01
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Expires: 1990-02-24
Abstract
Abstract A catheter for monitoring the concentration of lipids in the bloodstream made from a material that selectively absorbs lipids. The catheter is inserted in the bloodstream while the interior wall of the catheter is washed continuously or periodically with a nontoxic solvent delivered through a lipid-impermeable fiber to dissolve the absorbed lipids. The lipid-rich solvent is contacted with an absorbent located at the open end of the catheter and outside the epidermis to evaporate the solvent. The absorbent is analyzed periodically for lipids.
Inventors
- 👤 Edward W Merrill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:39
CPC Classifications
A; A61; A61M; A61M25/00; A61B; A61B5/00; A61B5/145; A61B5/14525; A61B5/14528; A61B5/14546
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
56 words
Apparatus for absorbing lipid materials comprising a lipidpermeable tube closed at one end and open at the opposite end, a hollow lipid-impermeable fiber in the tube for supplying a solvent for lipids to the closed end of the tube and an absorbent inserted in the open end of the tube permitting solvent evaporation while retaining lipids.
Claim 2
Dependent Claim
56 words
Apparatus for absorbing lipid materials comprising a lipidpermeable tube closed at one end and open at the opposite end, a hollow lipid-impermeable fiber in the tube for supplying a solvent for lipids to the closed end of the tube and an absorbent inserted in the open end of the tube permitting solvent evaporation while retaining lipids.
Claim 3
Dependent Claim
12 words
The apparatus of claim 1 wherein the tube comprises a silicone rubber.
Claim 4
Dependent Claim
17 words
The apparatus of claim 1 wherein the tube comprises a lipid-permeable elastomer containing a particulate heparin blood-anticoagulant.
Claim 5
Independent Claim
70 words
An apparatus for absorbing lipid materials comprising a lipid-permeable tube closed at one end and open at the opposite end, a hollow lipid-impermeable filler in the tube for supplying a solvent for lipids to the closed end of the tube, an absorbent inserted in the open end of the tube permitting solvent evaporation while retaining lipids, and a pump attached to said hollow fiber for delivering solvents, continuously or periodically.
Claim 6
Independent Claim
70 words
An apparatus for absorbing lipid materials comprising a lipid-permeable tube closed at one end and open at the opposite end, a hollow lipid-impermeable filler in the tube for supplying a solvent for lipids to the closed end of the tube, an absorbent inserted in the open end of the tube permitting solvent evaporation while retaining lipids, and a pump attached to said hollow fiber for delivering solvents, continuously or periodically.
Claim 7
Dependent Claim
11 words
The apparatus of claim 1 wherein the fiber is a polyamide.
Claim 8
Dependent Claim
116 words
The process for monitoring the concentration of lipids in the bloodstream of a live animal, which comprises inserting into the bloodstream the closed end of a lipid-permeable tube closed at one end and open at the opposite end, said tube having a hollow lipid-impermeable fiber for supplying a solvent for lipids to the closed end of the tube and having an absorbent inserted in the open end of the tube permitting solvent evaporation while retaining lipids while permitting the open end of the tube to extend through the epidermis, periodically or continuously passing a solvent for lipids through the fiber into the tube and to the absorbent and periodically determining the lipid concentration on said absorbent.
Claim 9
Dependent Claim
116 words
The process for monitoring the concentration of lipids in the bloodstream of a live animal, which comprises inserting into the bloodstream the closed end of a lipid-permeable tube closed at one end and open at the opposite end, said tube having a hollow lipid-impermeable fiber for supplying a solvent for lipids to the closed end of the tube and having an absorbent inserted in the open end of the tube permitting solvent evaporation while retaining lipids while permitting the open end of the tube to extend through the epidermis, periodically or continuously passing a solvent for lipids through the fiber into the tube and to the absorbent and periodically determining the lipid concentration on said absorbent.
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |