Injection device

• US 5,616,132 A
• Filed: 06/12/1995
• Issued: 04/01/1997
• Est. Priority Date: 06/09/1995
• Status: Expired due to Fees

• Current Assignee: Subqt, Inc.
• Original Assignee: Subot Incorporated
• Inventors: Newman, Duncan
• Primary Examiner(s): ELGART, VANITHA M
• Assistant Examiner(s): Alexander, V.
• Application Number:
  US08/489,455
• Time in Patent Office: 659 Days
• Field of Search: 604/185, 604/146, 604/150, 604/153, 604/140, 604/141, 604/143, 604/144, 604/187, 604/192, 604/197, 604/200-202, 604/204, 604/212, 604/236, 604/263, 604/415, 604/131 , 604/93
• US Class Current: 604/185
• CPC Class Codes: A61M 2005/206 With automatic needle insertion
• CPC Class Codes: A61M 5/2053 Media being expelled from injector by pressurised fluid or vacuum for infusion A61M5/145, A61M5/155
• CPC Class Codes: A61M 5/3129 Syringe barrels A61M5/3205 and A61M5/50 take precedence

Abstract

This invention relates to a portable medicant injection device having a diaphragm mounted within its housing and a hypodermic needle that moves in response to the movement of the diaphragm when pressurized gas is released into the housing.

Claims

1. In a medicant injection device of the hypodermic needle type:

a housing;

a diaphragm mounted in the housing for movement between a normal position and an extended position;

a hypodermic needle mounted within the housing and operatively connected to the diaphragm for movement whereby the hypodermic needle is responsive to movement of the diaphragm from its normal position to move between a retracted position and an extended position with respect to the housing;

at least one chamber wall defining a compressible medicant chamber within the housing, said compressible medicant chamber being in medicant-communication, during use, with the hypodermic needle;

propellant means comprising a pressurized fluid source in said housing for both moving the diaphragm from its normal position to its extended position to thereby cause a responding movement of the hypodermic needle from its retracted position as aforesaid and for compressing the compressible medicant chamber to cause medicant to be delivered through the hypodermic needle;

release means for manually releasing pressurized fluid from the pressurized fluid source of the propellant means to move said diaphragm and compress said compressible medicant chamber as aforesaid;

said housing having a height and a lower face of dimensions to seat with stability on the skin surface of a patient, in use, with said hypodermic needle in its extended position extending from said lower face.

2. In a medicant injection device as claimed in claim 1:

in which said medicant chamber is carried by said diaphragm and is at least partly defined by said diaphragm.

3. A medicant injection device as claimed in claim 2:

in which the compressible medicant chamber is located between the diaphragm and the lower face of the housing and is responsive to movement of the diaphragm from its normal position to compress and force medicant therefrom through the hypodermic needle as the diaphragm moves from its normal position to its extended position.

4. In a medicant injection device as claimed in claim 1:

in which said diaphragm has a resilient characteristic that under atmospheric pressure conditions returns it to its normal position from its extended position.

5. In a medicant injection device as claimed in claim 1:

in which one of said at least one chamber wall of the compressible medicant chamber is formed by a cup, said cup having a top opening sealed with a portion of said diaphragm.

6. In a medicant injection device as claimed in claim 1:

in which the compressible medicant chamber is located between the diaphragm and the lower face of the housing and is responsive to movement of the diaphragm from its normal position to compress and force medicant therefrom through the hypodermic needle as the diaphragm moves from its normal position to its extended position.