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Apparatus for preparing and administering a dose of a fluid mixture for injection into body tissue

  • US 5,334,163 A
  • Filed: 09/16/1992
  • Issued: 08/02/1994
  • Est. Priority Date: 09/16/1992
  • Status: Expired due to Fees
First Claim
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1. An apparatus for preparing and administering a dose of a fluid mixture for injection into an eye during a medical procedure;

  • the apparatus comprising;

    (a) a syringe having a hollow barrel and a plunger which travels within the hollow barrel to regulate fluid flow within, the hollow barrel having a first end and a second end that oppose each other such that travel of the plunger toward the second end forces fluid from the hollow barrel and travel toward the first end draws fluid into the hollow barrel;

    (b) a cannula having a proximal end and a distal end, the cannula defining a conduit therethrough which extends from the proximal end to the distal end;

    (c) a valve positioned intermediate the syringe and the cannula, the valve having a first passageway connected to be in fluid communication with the hollow barrel, a second passageway connected to be in fluid communication with the proximal end of the cannula, a third passageway connected to receive a first fluid, and a means for selectively directing fluid flow between two of the different passageways, and blocking flow in the remaining passageway, wherein the fluid flow is selectively directed from the third passageway to the hollow barrel to introduce the first fluid to the hollow barrel of the syringe for mixing with a second fluid to form the dose of the fluid mixture, and further wherein the fluid flow is selectively directed from the first passageway to the second passageway to permit fluid flow from the hollow barrel of the syringe to the distal end of the cannula to thereby administer the dose of the fluid into the eye by injection upon travel of the plunger toward the second end of the hollow barrel; and

    (d) a vessel which is connected to the third passageway, the vessel containing the first fluid under pressure, wherein the second fluid is air which is drawn into the hollow barrel by travel of the plunger toward the first end of the hollow barrel and the first fluid is an inert gas.

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