SYRINGE

• US 3,662,753 A
• Filed: 05/25/1970
• Issued: 05/16/1972
• Est. Priority Date: 05/25/1970
• Status: Expired due to Term

• Current Assignee: Kitchener B. Tassell
• Original Assignee: Kitchener B. Tassell
• Inventors: Tassell, Kitchener B.
• Primary Examiner(s): Mancene, Louis G.
• Assistant Examiner(s): Weinhold, D. L.
• Application Number:
  US05/040,197
• Time in Patent Office: 722 Days
• Field of Search: 128/218D,218M,218P,218PA,218N,220,215
• US Class Current: 604/89
• CPC Class Codes: A61M 2005/3139 Finger grips not integrally formed with the syringe barrel, e.g. using adapter with finger grips
• CPC Class Codes: A61M 2005/3151 by friction
• CPC Class Codes: A61M 5/284 comprising means for injection of two or more media, e.g. by mixing
• CPC Class Codes: A61M 5/288 by piercing without internal pressure increase A61M5/283 takes precedence
• CPC Class Codes: A61M 5/3202 Devices for protection of the needle before use, e.g. caps A61M5/50 takes precedence; for infusion spikes A61M5/1626; protectors for sharps A61B50/3001
• CPC Class Codes: A61M 5/348 snap lock, i.e. upon axial displacement of needle assembly A61M5/344 takes precedence

Abstract

A syringe assembly enabling mixed discharge of substances retained in separated condition until intended use, employing a plunger and barrel arrangement that retains the substances separated during storage, allows mixing thereof prior to discharge, and causes discharge of the mixed substances.

Claims

1. A syringe assembly capable of normally retaining two substances separated and of subsequently allowing mixing thereof, comprising:

an elongated barrel having a discharge end for cooperation with a syringe needle means, and a plunger inlet end;

a plunger having a plunger head in said barrel and a plunger shaft extending through said plunger inlet end and to a position externally of said barrel to enable said plunger head to be shifted along said barrel;

said barrel having at least two portions of differing diameters extending along its length, the larger being toward said plunger inlet end and the smaller toward said discharge end;

said plunger head having releasable seal means operative to form a seal with respect to said barrel when said plunger head is shifted in said barrel toward said discharge end, to release the seal when said plunger head is shifted away from said discharge end and into said larger diameter portion, allowing passage of one substance therepast for mixing of the substances, and to form a seal with respect to said barrel when said plunger head is shifted in said barrel toWard said discharge end to discharge the mixed substances.

2. The syringe in claim 1 including a smooth transition zone between said portions of differing diameters to allow said plunger head to retain its seal to said barrel when shifted toward said discharge end.

3. The syringe in claim 1 wherein said plunger head has a flexible peripheral sealing lip extending radially outwardly and diagonally toward said discharge end into engagement with said barrel, to be forced by pressure into sealing engagement with said barrel when shifted toward said discharge end and to be flexed out of sealing engagement with said barrel by said one substance when shifted away from said discharge end.

4. The syringe in claim 1 wherein said barrel has a needle assembly fitting, is of a polymeric material, and includes an integral polymeric portion forming a puncturable closure at said discharge end for puncture thereof by a needle when attached to said fitting.

5. A syringe assembly capable of normally retaining two substances separate and of subsequently allowing mixing thereof, comprising:

an elongated barrel having a discharge end for cooperation with a syringe needle means, and a plunger inlet end;

a plunger having a plunger head in said barrel and a plunger shaft extending through said plunger inlet end and externally of said barrel to enable said plunger head to be shifted along said barrel;

said plunger head having releasable seal means operative to form a seal with respect to said barrel to maintain substances separated in said barrel, to release the seal when said plunger head is shifted away from said discharge end to allow movement of a substance therepast for mixing of the substances, and to form a seal with respect to said barrel when said plunger head is shifted in said barrel toward said discharge end, to discharge the mixed substances.

6. A syringe assembly capable of normally retaining two substances separate and of subsequently allowing mixing thereof, comprising:

an elongated barrel having a discharge end for cooperation with a syringe needle means, and a plunger inlet end;

a plunger having a plunger head in said barrel and a plunger shaft extending through said plunger inlet end and externally of said barrel to enable said plunger head to be shifted along said barrel;

said barrel having at least two portions of differing diameters extending along its length, the larger diameter being toward said plunger inlet end and the smaller diameter toward said discharge end;

said plunger head having releasable seal means operative to form a seal with respect to said barrel to maintain substances separated in said barrel, to release the seal when said plunger head is shifted away from said discharge end to allow movement of a substance therepast for mixing of the substances, and to form a seal with respect to said barrel when said plunger head is shifted in said barrel toward said discharge end, to discharge the mixed substances.

7. The syringe as defined in claim 5 wherein said discharge end of said barrel includes a needle assembly fitting thereon having a section of reduced outer diameter for pressed fit locking engagement with a syringe needle means.

8. The syringe in claim 7 wherein said needle assembly fitting includes an internal integral membrane therein sealing said discharge end, said membrane forming a puncturable closure for puncture by a needle when attached to said fitting.

9. The syringe in claim 8 including a smooth transition zone between said portions of differing diameters to allow said plunger head to retain its seal with said barrel when shifted toward said discharge end.