Syringe

• US 5,599,312 A
• Filed: 06/01/1995
• Issued: 02/04/1997
• Est. Priority Date: 12/01/1992
• Status: Expired due to Fees

• Current Assignee: Tetsuro Higashikawa
• Original Assignee: Tetsuro Higashikawa
• Inventors: Higashikawa, Tetsuro
• Primary Examiner(s): YASKO JR, JOHN D
• Application Number:
  US08/446,832
• Time in Patent Office: 614 Days
• Field of Search: 604/191, 604/218, 604/89, 604/90, 604/232
• US Class Current: 604/191
• CPC Class Codes: A61M 2005/1787 Syringes for sequential delivery of fluids, e.g. first medicament and then flushing liquid
• CPC Class Codes: A61M 2005/287 by displacing occluding plugs
• CPC Class Codes: A61M 2005/3104 Caps for syringes without needle
• CPC Class Codes: A61M 2005/3123 having air entrapping or venting means, e.g. purging channels in pistons
• CPC Class Codes: A61M 2005/3132 having flow passages for injection agents at the distal end of the barrel to bypass a sealing stopper after its displacement to this end due to internal pressure increase
• 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 2005/31598 having multiple telescopically sliding coaxial pistons encompassing volumes for components to be mixed
• CPC Class Codes: A61M 5/19 having more than one chamber , e.g. including a manifold coupling two parallelly aligned syringes through separate channels to a common discharge assembly surgical glue applicators A61B17/00491
• CPC Class Codes: A61M 5/284 comprising means for injection of two or more media, e.g. by mixing
• CPC Class Codes: A61M 5/286 upon internal pressure increase, e.g. pierced or burst A61M5/283 takes precedence
• CPC Class Codes: A61M 5/3129 Syringe barrels A61M5/3205 and A61M5/50 take precedence
• CPC Class Codes: A61M 5/31596 comprising means for injection of two or more media, e.g. by mixing
• CPC Class Codes: A61M 5/348 snap lock, i.e. upon axial displacement of needle assembly A61M5/344 takes precedence

Abstract

In medical scenes requiring emergency, where plural medicines are to be injected simultaneously, or solution of solid medicine is to be injected, different kinds of injection agents, without being previously mixed, are accommodated in chambers formed separately in a cylinder. In using a syringe, both injection agents can be sequentially injected separately or mixedly by a simple operation.

Claims

1. A syringe, comprising:

a cylinder, having a connection portion for a syringe needle at a first end and an opening at a second end; and

a plunger to be inserted into the cylinder from the opening,

wherein a plurality of partitions are slidably provided between said connection portion and said plunger within said cylinder to divide an internal space of said cylinder into plural watertight chambers,

wherein between adjacent partitions or between one of said partition and said plunger, two or more chambers are formed,

wherein the chambers are filled with respective injection agents, and

a passage formed integrally with the cylinder and communicating each of said chambers with said connection portion is provided without distorting said partitions when said plunger is moved within said cylinder toward said first end.

2. A syringe according to claim 1, wherein:

said passage is formed between said chambers and the injection agents within said chambers are collected into a single chamber as said plunger advances to form a resultant injection agent which is injected.

3. A syringe according to claim 1, wherein:

said passage is formed on only a side of said connection portion and, as said plunger advances toward said first end, the injection agents in the respective chambers are injected sequentially without being mixed.

4. A syringe comprising a cylinder having a connection portion for a syringe needle at one end and an opening at the other end, and a plunger to be inserted into the cylinder from the opening, characterized in that

between said connection portion and said plunger within said cylinder, at least one partition is slidably provided to divide watertightly the internal space into plural chambers of said cylinder;

within at least one chamber between said partitions or between said partition and said plunger, an injection agent is accommodated;

a passage communicating each of said chambers with said connecting portion is provided when said plunger is moved to the side of said syringe needle;

within said cylinder, a hollow fixed type small cylinder is provided coaxially with said cylinder, at a portion of the hollow portion of said fixed type small cylinder a closing portion is formed, and on both sides of said closing portion, through-holes are formed to communicate the hollow portion of said fixed type small cylinder with that of said external cylinder;

within said fixed type small cylinder, a partition and a small plunger are fit to form one of said plungers therebetween, and between said cylinder and said fixed type small cylinder another partition and a large plunger are fit to form the other chamber therebetween;

one of said passages includes a terminal passing-through portion formed within said fixed type small cylinder and one of said through-holes;

the other passage includes the other through-hole; and

as said plunger moves, said partition is shifted from the position where said passage is closed to the position where the it is opened.

5. A syringe comprising:

a main cylinder having a needle-connection portion for fitting to a needle at one end and having a plunger-receiving opening at the other end;

a first plunger inserted into the cylinder from the opening, wherein at least two partitions are slidably provided between said connection portion and said plunger within said cylinder, to divide a space inside the main cylinder into at least two watertight chambers adapted to be filled with respective injection agents; and

a receiving element fitted into the main cylinder adjacent said one end, to provide at least one passage communicating each of said chambers with said connection portion as said at least two partitions are moved into the receiving element by movement of the plunger.

6. A syringe according to claim 5, wherein:

said passage is formed between said chambers.

7. A syringe according to claim 5, wherein:

said passage is formed on only the side of said needle-connection portion.

8. A syringe, comprising:

a cylindrical body having a first inside diameter and a first opening at a plunger-receiving end and an integral enlarged portion having a second inside diameter larger than said first inside diameter and a second opening at a needle-fitting end;

a plunger received via said first opening to be closely fitted into the cylindrical body to be slidable therein toward the needle-fitting end;

at least one intermediate partition closely fitted into and slidably movable longitudinally of the cylindrical body, disposed between the needle-fitting end and the plunger so as to define at least a first chamber between the needle-fitting end and an adjacent first side of the at least one intermediate partition and a second chamber for containing an injection material between the plunger and an adjacent second side of the at least one intermediate partition; and

a porous receiver element, having an outside diameter equal to the first inside diameter, fitted into the enlarged portion,

whereby movement of the plunger toward the needle-fitting end moves the injection material and the at least one intermediate partition toward the porous receiver element until the at least one intermediate partition is received within the porous receiver element, the injection material thereafter passing through the porous receiver element and into the second opening without distorting the at least one intermediate partition.

9. The syringe according to claim 8, wherein:

a cylinder, having a connection portion for a syringe needle at a first end and an opening at a second end; and

a plunger to be inserted into the cylinder from the opening,

wherein a plurality of partitions are slidably provided between said connection portion and said plunger within said cylinder to divide the internal space of said cylinder into plural watertight chambers,

wherein between adjacent partitions or between one of said partition and said plunger, two or more chambers are formed,

wherein the chambers are filled with respective injection agents, and

a passage formed integrally with the cylinder and communicating each of said chambers with said connection portion is provided without distorting said partitions when said plunger is moved within said cylinder toward said first end.

10. The syringe according to claim 9, wherein:

said passage is formed between said chambers and the injection agents within said chambers are collected into a single chamber as said plunger advances to form a resultant injection agent which is injected.