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Miniaturized injection device for medical use

  • US 8,105,283 B2
  • Filed: 02/18/2008
  • Issued: 01/31/2012
  • Est. Priority Date: 02/22/2007
  • Status: Active Grant
First Claim
Patent Images

1. A miniaturized injection device (1;

  • 51) for medical use comprising two tubes (2;

    52;

    3, 53) extending along a certain axial direction (A-A;

    B-B), a first tube (2;

    52) inserted in a second tube (3;

    53) with which it cooperates to form a cavity, in which second tube (3;

    53) there is placed at least one reservoir (12;

    512) for receiving a medicinal substance, the reservoir (12;

    512) being connected to at least one needle (14;

    514) disposed on a support (23) axially movable within said first tube (2;

    52) in such a manner that said needle (14;

    514) is moved axially in said first tube (2;

    52) in response to axial movement of said second tube (3;

    53) relative to said first tube (2;

    52), and the miniaturized injection device (1;

    51) being characterized in that, it is arranged in order that, in a step, the pressure exerted on said second tube (3;

    53) and the axial translation movement of said second tube (3;

    53) is transmitted to said reservoir (12;

    512), said needle (14;

    514) and said support (23), said needle (14;

    514) being therefore movable in said first tube (2;

    52) along said axial direction (A-A;

    B-B), and in that it further comprises a pump (13;

    513) interposed between said needle (14;

    514) and said reservoir (12;

    512), said pump (13;

    513) being controlled by means of a switch (21;

    521) that operates, in a further step, in response to said axial translation movement of said needle (14;

    514) and said reservoir (12;

    512) and said support (23) in said first tube (2;

    52) along said axial direction (A-A;

    B-B), leading to contact between an abutment (22) and said switch (21;

    521), said switch (21;

    521) being able to change state, thereby having the effect of causing said pump (13;

    513) to operate and leading in again a further step to the medicinal substance being injected into the patient'"'"'s body.

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