US4135510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Syringe barrel
Assignee: Merck Sharp & Dohme LLC
•
Filing: 1977-04-20
•
Granted: 1979-01-23
•
Expires: 1997-04-20
Abstract
Abstract A syringe barrel particularly advantageous for a disposable tip cap syringe which contains a prefilled suspension. The central bore of the syringe barrel has a diameter of 0.3 to 0.7 mm and thereby minimizes the settling of a suspended medicament within the syringe bore.
Inventors
- 👤 Pierre Assouly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:53
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/3129; A61M5/3134; A61M2005/3103; A61M2005/3106
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
78 words
A prefilled syringe which minimizes the settling of a suspended medicament within the syringe bore comprising: a barrel; a plunger extending within said barrel; a needle holding tip with a bore, said bore comprising a capillary portion having a 0.3 to 0.7 mm diameter and a flared distal portion with a diameter greater than said capillary portion; a medicament suspension within said syringe; and a tip shield with an integral protrusion which extends into said flared distal end.
Claim 2
Dependent Claim
78 words
A prefilled syringe which minimizes the settling of a suspended medicament within the syringe bore comprising: a barrel; a plunger extending within said barrel; a needle holding tip with a bore, said bore comprising a capillary portion having a 0.3 to 0.7 mm diameter and a flared distal portion with a diameter greater than said capillary portion; a medicament suspension within said syringe; and a tip shield with an integral protrusion which extends into said flared distal end.
Claim 3
Dependent Claim
18 words
A syringe as in claim 1, wherein the majority of the suspension particles are less than 50 microns.
Claim 4
Dependent Claim
18 words
A syringe as in claim 1, wherein the diameter of said capillary portion is 0.4 to 0.6 mm.
Claim 5
Dependent Claim
14 words
A syringe as in claim 3, wherein said capillary diameter is substantially 0.5 mm.
Claim 6
Dependent Claim
100 words
A barrel for a tip cap syringe comprising: a tubular body having a first open end adapted to receive a syringe plunger; and a tip end having a central bore and a tapered outer surface, said central bore comprising a capillary portion with a 0.3 to 0.7 mm diameter, and a flared distal portion with a diameter greater than said capillary portion, said tapered outer surface of said tip end adapted to releasably receive a tip shield which protrudes into said flared distal portion and is further adapted to securely hold a syringe needle after the tip shield is removed.
Claim 7
Dependent Claim
100 words
A barrel for a tip cap syringe comprising: a tubular body having a first open end adapted to receive a syringe plunger; and a tip end having a central bore and a tapered outer surface, said central bore comprising a capillary portion with a 0.3 to 0.7 mm diameter, and a flared distal portion with a diameter greater than said capillary portion, said tapered outer surface of said tip end adapted to releasably receive a tip shield which protrudes into said flared distal portion and is further adapted to securely hold a syringe needle after the tip shield is removed.
Claim 8
Dependent Claim
39 words
A syringe assembly comprising: a barrel as in claim 5, a plunger extending within said barrel; and a tip shield releasably held by said tapered surface, said tip shield containing an integral protuberance extending within said flared distal portion.
Claim 9
Dependent Claim
18 words
A syringe as in claim 5, wherein the diameter of said capillary portion is 0.4 to 0.6 mm.
Claim 10
Dependent Claim
28 words
A syringe as in claim 5, wherein the ratio of the length of said capillary portion to the total length of said bore is from 0.2 to 0.8.
Claim 11
Dependent Claim
14 words
A syringe as in claim 8, wherein said ratio is from 0.6 to 0.8.
Claim 12
Dependent Claim
18 words
A syringe as in claim 5, wherein the diameter of said distal portion is greater than 1.0 mm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |