US4484908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for relieving excess negativity in a drainage device
Assignee: Bioresearch Inc
•
Filing: 1983-02-16
•
Granted: 1984-11-27
•
Expires: 2003-02-16
Abstract
Abstract A method is provided for relieving excess negativity in a surgical underwater drainage device. The method comprises the steps of delivering a premeasured or metered amount of air directly to the thoractomy tube which is connected to the inlet of the drainage device. The metered amount of air is provided by an air chamber connected to the thoracotomy tube, the air chamber having a depressable plunger mounted therein. When the plunger is depressed the air within the chamber is delivered directly to the thoracotomy tube and when the plunger is released the air chamber is refilled with a metered amount of air. At no time is the thoracotomy tube open directly to the outside atmosphere.
Inventors
- 👤 Leonard D. Kurtz
- 👤 Joseph LiCausi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:53
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/60; A61M1/61
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
136 words
A method for relieving excess negativity in an inlet tube of a underwater drainage device adapted to be connected with a body cavity of a patient comprising the steps of: connecting an air pump having a plunger and an air chamber with a drainage device so that a fluid passageway is provided between the air pump and the interior of the drainage device and the inlet tube, connecting the inlet tube of the drainage device with a body cavity of a patient, depressing the plunger of the air pump to force a volume of air defined by the air chamber into the drainage device, and releasing the plunger to close the fluid passageway between the air pump and the interior of the drainage device and to open a passageway between the air chamber and atmospheric air.
Claim 2
Independent Claim
136 words
A method for relieving excess negativity in an inlet tube of a underwater drainage device adapted to be connected with a body cavity of a patient comprising the steps of: connecting an air pump having a plunger and an air chamber with a drainage device so that a fluid passageway is provided between the air pump and the interior of the drainage device and the inlet tube, connecting the inlet tube of the drainage device with a body cavity of a patient, depressing the plunger of the air pump to force a volume of air defined by the air chamber into the drainage device, and releasing the plunger to close the fluid passageway between the air pump and the interior of the drainage device and to open a passageway between the air chamber and atmospheric air.
Claim 3
Dependent Claim
34 words
A method according to claim 1 wherein the step of releasing the plunger causes spring means to return the plunger to the initial position thereof and to refill the air chamber with atmospheric air.
Claim 4
Dependent Claim
52 words
A method according to claim 2 wherein the step of releasing the plunger causes spring means to close the passageway between the air pump and the interior of the drainage device to prevent entry of air into the drainage device after delivery of the volume of air defined by the air chamber.
References Cited (Backward Citations)
CA871034A
Cited
GB856216A
Cited
US3187960A
Cited
US3750692A
Cited
SU602186A1
Cited
US4312351A
Cited
US4372336A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |