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Mechanical injection pump and method of use

  • US 9,731,067 B2
  • Filed: 11/25/2014
  • Issued: 08/15/2017
  • Est. Priority Date: 11/25/2014
  • Status: Active Grant
First Claim
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1. A mechanical injection pump wearable by a user to deliver a first fluid and a second fluid, the mechanical injection pump comprising:

  • a pump body defining a first fluid chamber and a second fluid chamber, the first fluid chamber being operable to hold the first fluid and the second fluid chamber being operable to hold the second fluid;

    a common connector having a first inlet, a second inlet, and a common outlet;

    a first fluid system including the first fluid chamber, a first button drive operably connected to the first fluid chamber, a first fluid delivery path in fluid communication between the first fluid chamber and the first inlet, a first piston slideably disposed in the first fluid chamber, and a first axial shaft operably connected between the first button drive and the first piston, wherein the first axial shaft has external threads, and the first button drive comprises;

    an axially fixed ratchet wheel having exterior teeth and internal threads, the internal threads being engaged with the first external threads of the first axial shaft; and

    a ratchet assembly operable to engage the exterior teeth of the axially fixed ratchet wheel; and

    a second fluid system including the second fluid chamber, a second button drive operably connected to the second fluid chamber, a second fluid delivery path in fluid communication between the second fluid chamber and the second inlet, a second piston slideably disposed in the second fluid chamber, and a second axial shaft operably connected between the second button drive and the second piston;

    wherein force by the user on the first button drive causes the ratchet assembly to rotate the axially fixed ratchet wheel a predetermined angle to advance the first piston a first predetermined distance into the first fluid chamber to drive a predetermined volume of the first fluid from the first fluid chamber, through the first fluid delivery path to the common connector, and out the common outlet; and

    force by the user on the second button drive advances the second piston a second predetermined distance into the second fluid chamber to drive a predetermined volume of the second fluid from the second fluid chamber, through the second fluid delivery path to the common connector, and out the common outlet.

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