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Device for injection of fluidic materials into body tissue

  • US 5,370,630 A
  • Filed: 11/12/1993
  • Issued: 12/06/1994
  • Est. Priority Date: 11/12/1993
  • Status: Expired due to Term
First Claim
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1. A device for injection of fluidic materials into body tissue, the device comprising:

  • (a) a syringe having a first end, a second end that opposes the first end, and a hollow barrel which is oriented along a longitudinal axis of the syringe, the syringe including a plunger which travels within the hollow barrel such that travel of the plunger toward the first end forces the fluidic material from the hollow barrel and travel of the plunger toward the second end draws the fluidic material into the hollow barrel, and the syringe further including a rod which is attached to the plunger and which extends beyond the second end of the syringe;

    (b) a housing having a first end, a second end that opposes the first end of the housing, and a bore which is oriented along a longitudinal axis of the housing, the first end of the housing being in juxtaposed relationship with the second end of the syringe, and wherein the longitudinal axis of the housing and the longitudinal axis of the syringe are the same such that the bore of the housing and the barrel of the syringe are in concentric relationship, the housing further comprising;

    (i) an end plate which is located at the second end of the housing, the end plate having an aperture through which the rod of the plunger extends beyond the second end of the housing;

    (ii) a piston which travels a predetermined distance within the bore of the housing, the piston having a hole concentric with the longitudinal axis through which the rod of the plunger extends therethrough;

    (iii) biasing means positioned between the piston and the first end of the housing, the biasing means biasing the piston toward the second end of the housing;

    (iv) ratchet means which engage the piston with the rod of the plunger when the biasing means is overcome and the piston is urged toward the first end of the housing, the plunger being indexed toward the first end of the syringe a distance which corresponds to the predetermined distance which the piston travels, and wherein the indexed distance which the plunger travels corresponds to a precise volume of fluidic material.

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