Portable and wearable injector of mini size

• US 4,640,445 A
• Filed: 12/20/1984
• Issued: 02/03/1987
• Est. Priority Date: 12/22/1983
• Status: Expired due to Fees

• Current Assignee: Nikkiso Company Limited
• Original Assignee: Nikkiso Company Limited
• Inventors: Yamada, Yasuyuki
• Primary Examiner(s): Rolla, Joseph J.
• Assistant Examiner(s): Huppert, Michael S.
• Application Number:
  US06/683,811
• Time in Patent Office: 775 Days
• Field of Search: 604/131, 604/140, 604/141, 604/143, 604/145, 222/105, 222/107, 222/386, 222/386.5, 222/389, 184/39
• US Class Current: 222/386.5
• CPC Class Codes: A61M 2005/14204 with gas-producing electrochemical cell
• CPC Class Codes: A61M 5/14593 the diaphragm being actuated by fluid pressure
• CPC Class Codes: A61M 5/155 pressurised by gas introduced into the reservoir

Abstract

A portable and wearable injector of mini size is disclosed, which may be operated for injection by means of a gas pressure and which is equipped with an injector syringe and a gas-impermeable flexible bag received in the syringe having one open end for injection and the other sealed end. The bag contains therein a gas-generating device for producing a pressure gas for expanding the bag in order to urge an infusion liquid through the open end of the syringe. As the gas-generating device there may be used an electric or chemical device.

Claims

1. A portable and wearable medical injector of mini size, which comprises an injector syringe and a gas-impermeable flexible bag received in the syringe, said syringe having one open end for injection of an infusion liquid, the other end being sealed, said bag containing therein a gas generating means comprising a chemical substance which is non-toxic to human beings and reactive with hydrogen peroxide, said bag prior to administration of infusion liquid being provided with a predetermined amount of hydrogen peroxide for reaction with the said chemical substance in the bag to produce an oxygen gas in the flexible bag for expanding the bag in the syringe to force the infusion liquid in predetermined quantities and rates over predetermined periods of time out of said open end of the syringe, said syringe being provided with a slidable element which seals its said other end, said slidable element having an extension at its bottom engageable by a tool for pulling the sealing element downwardly for filling the syringe with infusion liquid after mixture of said chemical substance with said hydrogen peroxide.

2. A portable and wearable injector according to claim 1, wherein said chemical substance comprises potassium iodide.