US3880164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Osmotic wound drain
Assignee: Alza Corp
•
Filing: 1972-05-22
•
Granted: 1975-04-29
•
Expires: 1992-05-22
Abstract
Abstract An evacuator device for the extraction of body fluids is comprised of body fluid receiving members adapted to be inserted into the area of the wound and fabricated from membrane material exhibiting controlled permeability to water, and a compartment for collecting such water that flows by osmosis across said membrane in a tendency for osmotic equilibrium with the environment of the device. The body fluid receiving means are advantageously elongated tubes adapted for insertion into the human body.
Inventors
- 👤 Norman Howard Stepno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:33
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/002; B01D61/0022; A; A61; A61M; A61M1/00; A61M1/14; A61M1/16; A61M1/1678; A61M1/80; A61M27/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
99 words
An evacuator device for the extraction of body fluids, said device comprising body fluid receiving means adapted to be inserted into the area of a wound and comprised of membrane material exhibiting controlled permeability to water, and means for collecting such water that flows by osmosis across said membrane in a tendency towards osmotic equilibrium with the environment of the device, said body fluid receiving means and said collecting means being filled with a solution of an osmotically effective solute which exhibits an osmotic pressure gradient against water, said water collection means including a freely flexible, water impermeable diaphragm.
Claim 2
Dependent Claim
99 words
An evacuator device for the extraction of body fluids, said device comprising body fluid receiving means adapted to be inserted into the area of a wound and comprised of membrane material exhibiting controlled permeability to water, and means for collecting such water that flows by osmosis across said membrane in a tendency towards osmotic equilibrium with the environment of the device, said body fluid receiving means and said collecting means being filled with a solution of an osmotically effective solute which exhibits an osmotic pressure gradient against water, said water collection means including a freely flexible, water impermeable diaphragm.
Claim 3
Dependent Claim
19 words
The evacuator device as defined by claim 1, whereIn said body fluid receiving means is comprised of elongated tubing.
Claim 4
Dependent Claim
30 words
The evacuator device as defined by claim 2, wherein said water collection means is comprised of a container which is compartmented by means of said freely flexible, water impermeable diaphragm.
Claim 5
Dependent Claim
60 words
The evacuator device as defined by claim 3, wherein the elongated tubing communicates with a first compartment of said container, such first compartment and the said tubing being filled with said solution of an osmotically effective solute which exhibits an osmotic pressure gradient against water, and the said freely flexible, water impermeable diaphragm defining wall means comprising said first compartment.
Claim 6
Dependent Claim
34 words
The evacuator device as defined by claim 4, wherein the container is compartmented into three compartments by means of a membrane exhibiting controlled permeability to water and by said freely flexible, water impermeable diaphragm.
Claim 7
Dependent Claim
118 words
The evacuator device as define by claim 5, wherein the elongated tubing communicates with a first compartment of said container, such first compartment and the said tubing being filled with said solution of an osmotically effective solute which exhibits an osmotic pressure gradient against water; the said first compartment being separated from the second compartment by means of the membrane exhibiting controlled permeability to water and said second compartment being filled with a second solution of an osmotically effective solute which exhibits an osmotic pressure gradient against water, said second solution being more concentrated than the first; and the said second compartment being separated from a third, empty compartment by means of the freely flexible, water impermeable diaphragm.
Claim 8
Dependent Claim
22 words
The evacuator device as defined by claim 1, further comprising means for attaching the water collector to the body of a patient.
Claim 9
Dependent Claim
15 words
The evacuator device as defined by claim 6, wherein the first solution is normal saline.
References Cited (Backward Citations)
US3115138A
Cited
US3732865A
Cited
US3760806A
Cited
US3760805A
Cited
US3760804A
Cited
US3760984A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |