Claims
- 1. In an injection syringe of the kind having a body formed with a chamber for receiving by axial movement a cylindrical ampoule of the kind having a sealing plug at one end serving as a piston and a piercable seal at the other end, the provision of
- (a) a piercing point extending axially within the body into the chamber capable of entry into said ampoule by penetrating said seal when the ampoule is pressed axially into said chamber,
- (b) said piercing point having a bore therethrough to effect communication of the interior of said ampoule with the exterior of the syringe body when the piercing point has penetrated the seal,
- (c) the outer surface of said piercing point being inwardly tapered over the entire length thereof, whereby the compression stress between the tapered piercing point and pierced seal ensures sealing thereinbetween,
- (d) said piercing point being formed integrally with said syringe body as a one-piece plastic unit, and
- (e) a conical shaped projection integral with said body for reception of a needle assembly, said projection having therein a continuation of the bore within said piercing point.
- 2. An injection syringe according to claim 1, wherein the piercing point is formed with an oblique surface having an angle of between 30.degree. and 75.degree. to the body axis.
- 3. An injection syringe according to claim 1, wherein the piercing point has a frusto conical exterior surface.
- 4. An injection syringe according to claim 1, wherein the lower end of the piercing point is flat.
- 5. An injection syringe according to claim 1, wherein said body is formed with a conical shaped projection integral with said body for reception of a needle assembly, said projection having therein a continuation of the bore within said piercing point.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2738676 |
Aug 1977 |
DEX |
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Parent Case Info
This is a continuation application of Ser. No. 133,661, filed Mar. 25, 1980, now abandoned which is a continuation of Ser. No. 934,651, filed Aug. 17, 1978, now abandoned.
US Referenced Citations (6)
Continuations (2)
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Number |
Date |
Country |
Parent |
133661 |
Mar 1980 |
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Parent |
934651 |
Aug 1978 |
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