Patent US1160853A successfully refreshed from Google Patents.
US3757780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Needle assembly with longitudinally movable filter
Assignee: Ishikawa Susakusho KK
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Filing: 1971-11-04
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Granted: 1973-09-11
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Expires: 1991-11-04
Abstract
Abstract A needle assembly for use with a medical injector such as a syringe or drip set. The needle assembly is provided with a filter element in a fluid passage formed therein for completely removing dust particles which might exist in a dosage solution or in a blood transfusion when injected or dripped into a human body.
Inventors
- 👤 S Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:39
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/3145; A61M5/14; A61M5/158
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
191 words
A needle assembly for use in a medical injector, comprising a substantially cylindrical needle holder having a tapered bore for communication through its enlarged end with a chamber in said injector and a passageway leading from a reduced end of said bore and smaller in cross sectional diameter than the bore, a needle connected to said needle holder and having a passageway aligned and communicating at one end with said passageway in the needle holder, said needle having an opening at the other end forming a piercing point, a plurality of annularly spaced projections formed on an inner peripheral surface of said needle holder defining said bore and located in proximity to said reduced end of said bore, and a substantially disc-shaped filter element movable between said reduced end and said projections and having a thickness smaller than a distance between said reduced end of said bore and said projections, said filter having a diameter substantially smaller than a diameter of said reduced end of said bore and larger than a diameter of said passageway in said needle holder and a diameter of a circle described by ends of said projections.
Claim 2
Dependent Claim
191 words
A needle assembly for use in a medical injector, comprising a substantially cylindrical needle holder having a tapered bore for communication through its enlarged end with a chamber in said injector and a passageway leading from a reduced end of said bore and smaller in cross sectional diameter than the bore, a needle connected to said needle holder and having a passageway aligned and communicating at one end with said passageway in the needle holder, said needle having an opening at the other end forming a piercing point, a plurality of annularly spaced projections formed on an inner peripheral surface of said needle holder defining said bore and located in proximity to said reduced end of said bore, and a substantially disc-shaped filter element movable between said reduced end and said projections and having a thickness smaller than a distance between said reduced end of said bore and said projections, said filter having a diameter substantially smaller than a diameter of said reduced end of said bore and larger than a diameter of said passageway in said needle holder and a diameter of a circle described by ends of said projections.
References Cited (Backward Citations)
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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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |