Half-disposable syringe barrel

• US 6,450,993 B1
• Filed: 11/12/1999
• Issued: 09/17/2002
• Est. Priority Date: 11/12/1999
• Status: Expired due to Fees

• Current Assignee: Bih-Chern Lin
• Original Assignee: Bih-Chern Lin
• Inventors: Lin, Bih-Chern
• Primary Examiner(s): Nguyen, Anhtuan T.
• Assistant Examiner(s): Lam, Ann Y.
• Application Number:
  US09/438,520
• Time in Patent Office: 1,040 Days
• Field of Search: 604/187, 604/188, 604/190, 604/191, 604/192, 604/199, 604/200, 604/212, 604/218, 604/221, 604/222
• US Class Current: 604/199
• CPC Class Codes: A61M 2005/31508 provided on the piston-rod
• CPC Class Codes: A61M 2005/3206 Needle or needle hub disconnecting devices forming part of or being attached to the hub or syringe body
• CPC Class Codes: A61M 5/282 by compression of deformable ampoule or carpule wall
• CPC Class Codes: A61M 5/3134 characterised by constructional features of the distal end, i.e. end closest to the tip of the needle cannula
• CPC Class Codes: A61M 5/31505 Integral with the syringe barrel, i.e. connected to the barrel so as to make up a single complete piece or unit

Abstract

A Half-disposable syringe barrel including a barrel syringe and a cap member as two stages. A plunger is fitted in the syringe barrel. An emulsion ring is disposed in the cap member. The emulsion ring is formed with a membrane and is made of highly flexible material. A lubricant is overlaid on the emulsion ring and the membrane thereof. The cap member is fitted with the front end of the syringe barrel. When pulling the plunger backward to suck a medicine, the highly flexible membrane of the emulsion ring is extended and sucked to attach to the wall of the syringe barrel. Therefore, the medicine is enclosed by the emulsion ring and the membrane and isolated from the wall of the syringe barrel. Therefore, the syringe barrel and the plunger are not contaminated by the medicine and the flowing back blood. After the cap member is removed, the syringe barrel can be recovered for reuse.

Claims

1. A half-disposable syringe barrel comprising:

a syringe barrel which is a hollow tubular body in which a plunger is fitted;

a cap member in which an emulsion ring, a ventilation ring and an O-ring are disposed, the emulsion ring being formed with a membrane, the cap member being detachably fitted with front end of the syringe barrel, whereby when sucking a medicine, the emulsion ring and the membrane thereof form a protective film covering the wall of the syringe barrel to isolate the medicine and the wall of the syringe barrel, after used, the cap member being detached from the syringe barrel and discarded, while the syringe barrel and the plunger being recovered; and

wherein the peripheral wall of the ventilation ring is formed with multiple vents through which the air in the syringe barrel escapes.

2. The half-disposable syringe barrel as claimed in claim 1, wherein the syringe barrel and the cap member have cooperative conic profiles for filing with each other by means of the coning.

3. The half-disposable syringe barrel as claimed in claim 1, wherein the syringe barrel and the cap member are formed with corresponding annular rib and annular groove for engaging with each other.

5. The half-disposable syringe barrel as claimed in claim 1, wherein the emulsion ring and the membrane thereof are made of highly flexible material.

6. The half-disposable syringe barrel as claimed in claim 1, wherein a lubricant is overlaid on the emulsion ring and the membrane thereof.

7. The half-disposable syringe barrel as claimed in claim 1, wherein the opening of the cap member is sealed by a sealing layer.

4. The half-disposable syringe barrel as claimed in 1, wherein the rear ends of the syringe barrel and the plunger are formed with corresponding notch and protuberance, whereby the protuberance is aligned with the notch, the syringe barrel can be separated from the cap member.