Patent US3672369A successfully refreshed from Google Patents.
US3672369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hypodermic syringe
Assignee: Sherwood Medical Co
•
Filing: 1969-12-18
•
Granted: 1972-06-27
•
Expires: 1989-12-18
Abstract
Abstract A syringe of the hypodermic type including a unitary barrel member having a large upper bore and a small lumen at the lower end thereof communicating with the bore, the lower end of the barrel member being adapted to receive a needle, with a piston assembly slidable in the barrel member and having a sealing portion sealingly engaged the large bore and shaped to discharge all of the medicant from the large bore, there being provided a plunger fixed to the piston assembly and complementary to as well as coextensive in length with the barrel member lumen for the purpose of discharging all of the medicant from the lumen minimizing medicant loss in the syringe.
Inventors
- 👤 Alexander M Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:46
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/315; A61M5/31511; A61M2005/31516
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
237 words
A hypodermic syringe assembly of the luer type, comprising: a unitary transparent barrel member having an upper receptacle portion with a large diameter bore, and a lower portion integral with said receptacle portion and having a lumen communicating with said bore and of a smaller diameter than said bore, said lumen extending entirely through said lower portion to the lower end of said barrel member, a removable needle and hub member with the needle hub surrounding and fixed to said lower portion and slidable thereon, said hub being engaged with the exterior surface of said lower portion and surrounding a substantial lower end portion of said lumen, a plunger slidable in said barrel member for discharging medicament therefrom, said plunger having a seal portion conforming in configuration to and engageable with the juncture between said receptacle and said lumen, said plunger having a small diameter projection fixed thereto and conforming in shape to said lumen, said projection being of sufficient size to completely fill said lumen and of sufficient length to extend in the discharged position of said plunger substantially to the lower end of said lumen and within said hub to assure discharge of substantially all of the medicament from said barrel member said plunger including a rubber seal member having said seal portion thereon and said projection extending axially from said seal portion and having an axial length greater than the diameter of said bore.
Claim 2
Dependent Claim
237 words
A hypodermic syringe assembly of the luer type, comprising: a unitary transparent barrel member having an upper receptacle portion with a large diameter bore, and a lower portion integral with said receptacle portion and having a lumen communicating with said bore and of a smaller diameter than said bore, said lumen extending entirely through said lower portion to the lower end of said barrel member, a removable needle and hub member with the needle hub surrounding and fixed to said lower portion and slidable thereon, said hub being engaged with the exterior surface of said lower portion and surrounding a substantial lower end portion of said lumen, a plunger slidable in said barrel member for discharging medicament therefrom, said plunger having a seal portion conforming in configuration to and engageable with the juncture between said receptacle and said lumen, said plunger having a small diameter projection fixed thereto and conforming in shape to said lumen, said projection being of sufficient size to completely fill said lumen and of sufficient length to extend in the discharged position of said plunger substantially to the lower end of said lumen and within said hub to assure discharge of substantially all of the medicament from said barrel member said plunger including a rubber seal member having said seal portion thereon and said projection extending axially from said seal portion and having an axial length greater than the diameter of said bore.
Claim 3
Dependent Claim
32 words
A syringe assembly as defined in claim 1, wherein said lumen is tapered downwardly and said projection is a part of said seal member and is tapered downwardly complementary with said lumen.
Claim 4
Dependent Claim
158 words
A hypodermic syringe asseMbly of the luer type, comprising: a generally cylindrical barrel member, a needle and hub member connected to the lower end of said barrel member, said barrel member having an upper portion with an upper bore, and a lower portion integral with said upper portion and having a bore communicating with and of smaller diameter than said upper bore, a plunger assembly slidable in said barrel member, seal means on said plunger assembly for discharging all of the medicament from said upper bore, and a projection on said plunger assembly fixed with respect thereto and having an axial length greater than the diameter of said upper bore for discharging substantially all of the medicament from said smaller diameter bore, the hub of said needle and hub member slidably engaging the exterior surface of said lower portion and surrounding a substantial lower end portion of said projection when said plunger assembly is in the discharged position.
Claim 5
Dependent Claim
158 words
A hypodermic syringe asseMbly of the luer type, comprising: a generally cylindrical barrel member, a needle and hub member connected to the lower end of said barrel member, said barrel member having an upper portion with an upper bore, and a lower portion integral with said upper portion and having a bore communicating with and of smaller diameter than said upper bore, a plunger assembly slidable in said barrel member, seal means on said plunger assembly for discharging all of the medicament from said upper bore, and a projection on said plunger assembly fixed with respect thereto and having an axial length greater than the diameter of said upper bore for discharging substantially all of the medicament from said smaller diameter bore, the hub of said needle and hub member slidably engaging the exterior surface of said lower portion and surrounding a substantial lower end portion of said projection when said plunger assembly is in the discharged position.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |