Patent US4116240A successfully refreshed from Google Patents.
US4116240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixing syringe
Assignee: Individual
•
Filing: 1977-03-11
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Granted: 1978-09-26
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Expires: 1997-03-11
Abstract
Abstract A single barrel mixing syringe in which one material such as a liquid is stored in the bore of the syringe barrel and another material such as a powder is stored in a chamber formed in a resilient piston head which forms not only the powder containing compartment but also the seals preventing leakage of liquid from the syringe. The two chambers are separated by a wall which may be displaced in one embodiment by differential pressure during movement of the piston portion of the syringe and in another embodiment by a separate plunger which displaces the wall.
Inventors
- 👤 Aeneas C. Guiney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:38
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/315; A61M5/31596; A61M5/31598
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
218 words
A syringe assembly for storing two different materials separately in readiness for mixing together and for injection as a liquid at the time of use, the combination of; a cylinder, a discharge port formed in a wall of said cylinder for communication with the interior of said cylinder, a plunger slidably disposed in said cylinder and projecting from an open end thereof opposite to said discharge port, said plunger forming a first chamber therein, a second chamber formed in said cylinder between said plunger and said discharge port, a movable wall member separating said first and said second chambers from each other, said second chamber being adapted to contain one of the materials to be mixed and said first chamber being adapted to contain the other of said materials, an actuating member supported for axial movement relative to said plunger, one end of said actuating member being connected to said wall and being operative to move said wall to a position communicating said first and said second chambers with each other, said plunger being movable toward said discharge port to displace said mixed materials from said cylinder and lock means for holding said rigid wall member in closed relationship with said plunger during movement of the latter to maintain said first and second chambers isolated from each other.
Claim 2
Dependent Claim
218 words
A syringe assembly for storing two different materials separately in readiness for mixing together and for injection as a liquid at the time of use, the combination of; a cylinder, a discharge port formed in a wall of said cylinder for communication with the interior of said cylinder, a plunger slidably disposed in said cylinder and projecting from an open end thereof opposite to said discharge port, said plunger forming a first chamber therein, a second chamber formed in said cylinder between said plunger and said discharge port, a movable wall member separating said first and said second chambers from each other, said second chamber being adapted to contain one of the materials to be mixed and said first chamber being adapted to contain the other of said materials, an actuating member supported for axial movement relative to said plunger, one end of said actuating member being connected to said wall and being operative to move said wall to a position communicating said first and said second chambers with each other, said plunger being movable toward said discharge port to displace said mixed materials from said cylinder and lock means for holding said rigid wall member in closed relationship with said plunger during movement of the latter to maintain said first and second chambers isolated from each other.
Claim 3
Dependent Claim
78 words
The combination of claim 1 in which said lock means includes a lock element on said actuating member engageable with a lock portion on said plunger for preventing relative movement of said plunger and actuating member when said lock element and portion are in locked position, said actuating member being movable a limited amount relative to said plunger when said lock element and portion are in their unlocked position to permit communication of said first and second chambers.
Claim 4
Dependent Claim
38 words
The combination of claim 1 and further comprising seal means between said wall member and said plunger, said seal means biasing said actuating member and plunger relative to each other to maintain said lock means in locked position.
Claim 5
Dependent Claim
52 words
The combination of claim 2 wherein said lock element is movable into engagement with a stop portion on said plunger when said lock element and lock portion are in their unlocked position to move said actuating member and plunger as a unit in one direction in response to movement of said plunger.
References Cited (Backward Citations)
US2305278A
Cited
US2869543A
Cited
US3477432A
Cited
US3477431A
Cited
DE1791293A1
Cited
US3557787A
Cited
US3885710A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-25 | 1982-03-27 | 1982-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-25 | 1986-03-27 | 1986-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-25 | 1990-03-27 | 1990-09-26 | $7700.00 | Window Closed / Lapsed |