US3583399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-aspirating syringe
Assignee: AstraZeneca Canada Inc
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Filing: 1969-08-29
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Granted: 1971-06-08
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Expires: 1989-08-29
Abstract
Abstract A hypodermic syringe for medical, dental, or veterinary use employing cartridge ampuls of injectable fluid arranged to be automatically self-aspirating. A resilient membrane is deflected at the forward end of the ampul rearwardly of the ampul each time the syringe plunger is actuated, so that upon release of the plunger the membrane is automatically resiliently restored to its normal position thereby producing conditions of reduced pressure or aspiration within the ampul. The membrane is deflected on a stud positioned at the forward end of the ampul-receiving cavity in the syringe, or on a movable flanged tubular element on the ampul adjacent the membrane and projecting forwardly of the ampul.
Inventors
- 👤 Anthony F Ritsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:07
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/24; A61M2005/2403; A61M2005/2414; A61M2005/2433; A61M2005/2437; A61M5/2455; A61M5/2466; A61M2005/247; A61M2005/2477; A61M5/31; A61M2005/3112; A61M5/3148; Y; Y10; Y10S; Y10S604/00; Y10S604/90
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
257 words
A self-aspirating syringe for use with a plunger-type cartridge ampul of the type comprising a tubular body filled with injectable filled fluid having a rear end closed by a movable piston member and a forward end closed by a flexible resilient membrane, said syringe comprising: a body member having means providing a cavity to accommodate therewithin one of said cartridge ampules, and having axially disposed openings at the front and rear ends thereof; a plunger member extending through the opening at the rear end of said cavity and slidable with respect thereto, said plunger having a head at its forward end adapted to engage the said movable piston member to slide the same forwardly within said tubular body, and a manually engageable actuator at the rear end thereof for pressing said plunger forward; means for mounting an adapter within the opening at the front end of the syringe body member, said adapter being arranged to receive and secure a hypodermic needle in axial alignment with said tubular body with the rear end of the needle extending through said flexible membrane into said injectable solution; and stud means adjacent to the front end of said body, projecting rearwardly therewithin and adapted to be engaged by said membrane whereby upon movement forward by of said tubular body under the influence of said plunger said membrane is stretched rearwardly of said tubular body, and upon release of said influence said tubular body moves rearwards under the influence of said stretched membrane to create conditions of aspiration within said tubular body.
Claim 2
Dependent Claim
257 words
A self-aspirating syringe for use with a plunger-type cartridge ampul of the type comprising a tubular body filled with injectable filled fluid having a rear end closed by a movable piston member and a forward end closed by a flexible resilient membrane, said syringe comprising: a body member having means providing a cavity to accommodate therewithin one of said cartridge ampules, and having axially disposed openings at the front and rear ends thereof; a plunger member extending through the opening at the rear end of said cavity and slidable with respect thereto, said plunger having a head at its forward end adapted to engage the said movable piston member to slide the same forwardly within said tubular body, and a manually engageable actuator at the rear end thereof for pressing said plunger forward; means for mounting an adapter within the opening at the front end of the syringe body member, said adapter being arranged to receive and secure a hypodermic needle in axial alignment with said tubular body with the rear end of the needle extending through said flexible membrane into said injectable solution; and stud means adjacent to the front end of said body, projecting rearwardly therewithin and adapted to be engaged by said membrane whereby upon movement forward by of said tubular body under the influence of said plunger said membrane is stretched rearwardly of said tubular body, and upon release of said influence said tubular body moves rearwards under the influence of said stretched membrane to create conditions of aspiration within said tubular body.
Claim 3
Dependent Claim
89 words
A self-aspirating syringe according to claim 1 wherein said plunger member is guided to slide within a bushing carried within said opening at the rear end of the body member, said bushing having a front end adapted to extend within the rear end of the tubular body of the cartridge ampul, said bushing extending rearwardly through said opening at the rear end of said body member and being axially slidable therein, and wherein resilient means engaging said bushing are adapted controllably to bias said bushing in a forward direction.
Claim 4
Dependent Claim
76 words
A self-aspirating syringe according to claim 2 wherein said bushing carries a flange at the rear of the syringe body member by means of which the bushing can be engaged and moved axially to urge said cartridge ampul forward; whereby said membrane is stretched inwardly of said tubular body and upon release of said bushing the tubular body moves rearwards under the influence of said stretched membrane to create conditions for aspiration within said tubular body.
Claim 5
Dependent Claim
37 words
A self-aspirating syringe according to claim 2 wherein said resilient means comprises a compression spring surrounding a length of the bushing between a flange at the forward end thereof and the rear end of said body member.
Claim 6
Dependent Claim
41 words
A self-aspirating syringe according to claim 2 wherein the plunger has a head at the forward end thereof and the Forward end of the bushing is formed with an enlarged recess of a size to accommodate the head of said plunger.
Claim 7
Dependent Claim
21 words
A self-aspirating syringe according to claim 1 wherein said stud means comprises a central rearwardly projecting stud integral with said adapter.
Claim 8
Dependent Claim
34 words
A self-aspirating syringe according to claim 1 wherein said stud means comprises a collar on said hypodermic needle arranged to seat against the rear face of the adapter when the needle is secured therein.
Claim 9
Dependent Claim
72 words
A plunger-type cartridge ampul for use in a hypodermic syringe comprising a generally tubular container having a rear end sealed by a piston which is movable axially of the container, and a front end sealed by a resilient membrane, the cartridge having a central forwardly projecting element at the forward end thereof which in use is operative to transmit to the membrane a deflection rearwardly of the front end of the container.
Claim 10
Dependent Claim
72 words
A plunger-type cartridge ampul for use in a hypodermic syringe comprising a generally tubular container having a rear end sealed by a piston which is movable axially of the container, and a front end sealed by a resilient membrane, the cartridge having a central forwardly projecting element at the forward end thereof which in use is operative to transmit to the membrane a deflection rearwardly of the front end of the container.
Claim 11
Dependent Claim
65 words
A plunger-type cartridge ampul according to claim 8 wherein said membrane is secured to the front end of the container by an annular collar which has a radial inwardly-projecting flange which overlies the peripheral area of said membrane, said element comprising a short tubular member extending forwardly from the membrane and having a radial outwardly extending flange retained between the membrane and the collar flange.
Claim 12
Dependent Claim
239 words
A self-aspirating syringe comprising a generally tubular body having a cavity and an open rear end and a plunger-type cartridge ampul received in said syringe body and comprising a tubular body filled with injectable fluid and having a rear end closed by a movable piston member and a forward end closed by a flexible resilient membrane, the syringe having an axially disposed plunger extending through the opening in the rear end thereof and into the cavity and being axially movable said plunger having a forward end having a head operative to engage the piston member of the ampul to slide the same forwardly within said tubular body, an actuating member at the rear end of the plunger for manual actuation thereof, the syringe having a forward end formed with an axial opening in which is received means mounting a hypodermic needle in axial alignment with the tubular body of the ampul, said needle having a rear end piercing said membrane and extending into said ampul, and abutment means positioned between the forward end of the syringe body and the resilient membrane and engaging said membrane, said abutment means being operative, upon forward movement of said ampul in said cavity under the influence of said plunger, to stretch said membrane rearwardly of said tubular body, whereby upon release of said influence said stretched membrane is operative to move said tubular body rearwardly to create conditions of aspiration within said ampul.
Claim 13
Dependent Claim
239 words
A self-aspirating syringe comprising a generally tubular body having a cavity and an open rear end and a plunger-type cartridge ampul received in said syringe body and comprising a tubular body filled with injectable fluid and having a rear end closed by a movable piston member and a forward end closed by a flexible resilient membrane, the syringe having an axially disposed plunger extending through the opening in the rear end thereof and into the cavity and being axially movable said plunger having a forward end having a head operative to engage the piston member of the ampul to slide the same forwardly within said tubular body, an actuating member at the rear end of the plunger for manual actuation thereof, the syringe having a forward end formed with an axial opening in which is received means mounting a hypodermic needle in axial alignment with the tubular body of the ampul, said needle having a rear end piercing said membrane and extending into said ampul, and abutment means positioned between the forward end of the syringe body and the resilient membrane and engaging said membrane, said abutment means being operative, upon forward movement of said ampul in said cavity under the influence of said plunger, to stretch said membrane rearwardly of said tubular body, whereby upon release of said influence said stretched membrane is operative to move said tubular body rearwardly to create conditions of aspiration within said ampul.
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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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |