US3677246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hypodermic syringe
Assignee: Individual
•
Filing: 1971-02-17
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Granted: 1972-07-18
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Expires: 1991-02-17
Abstract
Abstract A hypodermic syringe which is provided with a relatively small injection chamber the volume of which is adjustable and from which an injection solution such as insulin or the like may be ejected by a piston through a hypodermic needle, and with a second relatively larger chamber, for example an ampoule, which is adapted to hold a relatively large supply of the injection solution and from which the injection chamber may be filled repeatedly for several injections.
Inventors
- 👤 Walter Stein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:35
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/20; A61M5/204
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
187 words
A hypodermic syringe comprising a housing, a slidable injection cylinder disposed in said housing and provided with an injection chamber adapted to hold a relatively small, predetermined amount of an injection solution, a hypodermic needle carried by said cylinder and extending outwardly through said housing, a piston mounted for reciprocation in said injection chamber, a container adapted to hold a relatively large supply of an injection solution mounted for independent reciprocatory movement in said housing adjacent to said cylinder, valve controlled conduit means interconnecting said container and said injection chamber, pump means in said housing having an air inlet communicating with the exterior of said cOntainer and an outlet communicating with said container operable by reciprocatory movement of said container to force the injection solution from the container into said injection chamber, manually operable means for reciprocating said container to operate said pump, and spring actuated manually controlled means operable to slide said cylinder in said housing to insert said hypodermic needle in use and then to advance said piston in said injection chamber to eject said injection solution from said injection chamber through said hypodermic needle.
Claim 2
Dependent Claim
187 words
A hypodermic syringe comprising a housing, a slidable injection cylinder disposed in said housing and provided with an injection chamber adapted to hold a relatively small, predetermined amount of an injection solution, a hypodermic needle carried by said cylinder and extending outwardly through said housing, a piston mounted for reciprocation in said injection chamber, a container adapted to hold a relatively large supply of an injection solution mounted for independent reciprocatory movement in said housing adjacent to said cylinder, valve controlled conduit means interconnecting said container and said injection chamber, pump means in said housing having an air inlet communicating with the exterior of said cOntainer and an outlet communicating with said container operable by reciprocatory movement of said container to force the injection solution from the container into said injection chamber, manually operable means for reciprocating said container to operate said pump, and spring actuated manually controlled means operable to slide said cylinder in said housing to insert said hypodermic needle in use and then to advance said piston in said injection chamber to eject said injection solution from said injection chamber through said hypodermic needle.
Claim 3
Dependent Claim
29 words
A hypodermic syringe as defined in claim 1 including means for varying the volume of said injection chamber and therefore the amount of injection solution ejected by said piston.
Claim 4
Dependent Claim
31 words
A hypodermic syringe as defined in claim 1 including adjusting means for varying the travel of said injection cylinder in said housing and consequently the insertion amount of said hypodermic needle.
Claim 5
Dependent Claim
35 words
A hypodermic syringe as defined in claim 2 wherein said volume varying means comprises a cap nut adjustably screwed on said injection cylinder, and means for maintaining said cap nut in a selected adjusted position.
Claim 6
Dependent Claim
46 words
A hypodermic syringe as defined in claim 1 wherein said pump means comprises two pump members telescopically slidable on each other, one of said members having said air inlet and said air outlet in the form of a hollow needle adapted to penetrate into said container.
Claim 7
Dependent Claim
18 words
A hypodermic syringe as defined in claim 5 including spring means for holding said pump members normally apart.
Claim 8
Dependent Claim
95 words
A hypodermic syringe as defined in claim 1 wherein said piston is operable by reciprocation of said container, and wherein said spring actuated means includes a main spring confined between said container and said housing adapted when released to effect a forward propulsion first of said injection cylinder, said container, and said piston simultaneously and subsequently forward movement of said piston in said injection cylinder to effect ejection of said solution from said injection chamber, means for loading said main spring and for holding it in loaded condition and means for releasing said main spring.
Claim 9
Dependent Claim
40 words
A hypodermic syringe as defined in claim 7 further including delaying means for insuring that said movement of said piston on said injection chamber will not occur until said injection cylinder has been moved a predetermined distance in said housing.
Claim 10
Dependent Claim
64 words
A hypodermic syringe as defined in claim 8 wherein said delaying means comprise a leaf spring secured to said injection cylinder guided in said housing and adapted to pivot away from the longitudinal direction of said cylinder through a slot in said housing and adapted initially to prevent relative movement between said container and said injection cylinder and then to permit such relative movement.
Claim 11
Dependent Claim
42 words
A hypodermic syringe as defined in claim 1, further including a cap nut adjustably mounted on said housing, and a transparent cap removably connected to said cap nut engageable by said injection cylinder to control the forward travel thereof in said housing.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |