Medical solution delivery system

• US 5,380,287 A
• Filed: 07/27/1993
• Issued: 01/10/1995
• Est. Priority Date: 07/31/1992
• Status: Expired due to Fees

• Current Assignee: Nissho Corporation (Nitto Denko Corporation)
• Original Assignee: Nissho Corporation (Nitto Denko Corporation)
• Inventors: Kikuchi, Toshihiro, Futagawa, Hitoshi
• Primary Examiner(s): WEISS, JOHN
• Application Number:
  US08/097,051
• Time in Patent Office: 532 Days
• Field of Search: 604/135, 604/154, 604/155, 604/152
• US Class Current: 604/135
• CPC Class Codes: A61M 5/1454 spring-actuated, e.g. by a clockwork
• CPC Class Codes: A61M 5/1456 with a replaceable reservoir comprising a piston rod to be moved into the reservoir, e.g. the piston rod is part of the removable reservoir

Abstract

A medical solution delivery system comprises a cylindrical container having an opening at one end and a port for a medical solution at the opposite end; a plunger slidably arranged in the container; a plunger-driving device for forcing the plunger to move towards the port of the container to deliver a medical solution therethrough; a capsule for holding the container, the plunger and the plunger-driving device; and a flow control device connected to the port of the container to control a flow rate of the solution delivered therefrom. The solution in the container is delivered through a flow control device connected to the port of the container.

Claims

1. A medical solution delivery system comprising:

a syringe composed of a cylindrical container and a plunger slidable arranged therein, said container having a narrow part forming a port for a medical solution;

plunger-driving means of a constant force for forcing the plunger toward the port of the container to deliver a medical solution in the cylindrical container;

a capsule having a chamber for holding the syringe and the plunger-driving means therein; and

a flexible connecting tube connectable to the narrow part of said container and provided with flow control means arranged therein to control a flow rate of the medical solution delivered from the syringe;

said capsule being a cylindrical member having a hole formed at one end thereof so that the narrow part of said container is protruded from the capsule therethrough, said capsule being composed of a capsule body and a covering member removably fitted in the capsule body, said capsule body being provided with an L-shaped slit which extends from a middle part thereof along the barrel of the capsule body to the rear part and then circumferentially extends therefrom to form a short arm portion with a cut.

2. The medical solution delivery system claimed in claim 1, wherein said plunger-driving means comprises a constant force spring wound around a drum, said constant force spring being fixed at one end thereof to the front end of the capsule and being adapted to be in contact with the rear end of the plunger at the opposite wound part thereof.

3. The medical solution delivery system claimed in claim 1, wherein said plunger-driving means comprises a constant force spring wound around a drum, said constant force spring being fixed at one end thereof to the container and being adapted to be in contact with the rear end of the plunger at the opposite wound part thereof.

4. The medical solution delivery system claimed in claim 1, wherein the plunger-driving means is a rubber spring formed in a wire, the rubber spring being fixed at one end thereof to the front side of the capsule and at the opposite end to a disk-like member adapted to be brought into contact with the rear end of the plunger.

5. The medical solution delivery system claimed in claim 1, wherein the plunger-driving means is a coil spring.

6. The medical solution delivery system claimed in claim 5, wherein said coil spring is fixed at one end thereof to the front side of the capsule and at the opposite end to a member adapted to be brought into contact with the rear end of the plunger.

7. The medical solution delivery system claimed in claim 5, wherein said coil spring is arranged between a rear end of the capsule and a rear end of the plunger.