Patent ID: 6712787
Filing Date: 2004-03-30
Classification: A61M,Y10S

Abstract:
A syringe, comprising:a syringe body with a distal end and a proximal end, wherein the syringe body is an elongated hollow tube with an inside surface and an outside surface; a needle cannula module with a distal end and a proximal end; a cannula tunnel formed in the needle cannula module, wherein the cannula tunnel extends from the distal end to the proximal end of the needle cannula module and wherein the proximal end of the needle cannula module is fixed to the distal end of the syringe body; a needle cannula with a distal end and a proximal end, wherein a needle cannula flange is formed on the proximal end of the needle cannula; a plunger module with a distal end and a proximal end, wherein the plunger module is moveably disposed in the syringe body for pushing fluid in the syringe body for explosion out of the needle cannula; a barrier cannula with a distal end and a proximal end, wherein the barrier cannula is connected to the proximal end of the needle cannula module and wherein the barrier cannula has cannula formed there through permitting fluid communication between the syringe body and the needle cannula; an annular cone shear and cutter head with a distal end and a proximal end, wherein the proximal end is fixed to the distal end of the plunger module and wherein the distal end is formed into a cutting edge for shearing and cutting; a plunger barrier with a distal end and a proximal end, wherein the proximal end of the plunger barrier is supported on the cutting edge on the distal end of the annular cone shear and cutter head, wherein the distal end of the plunger barrier forms a fluid tight seal with the inside surface of the syringe body, wherein thrusting the plunger in a distal direction causes the cutting edge to push the plunger barrier in the distal direction, and then thrusts the distal end of the plunger barrier against the proximal end of the barrier cannula, causing the distal end of said annular cone shear and cutter head to cut the plunger barrier and the barrier cannula to free the needle cannula, wherein the needle cannula is moveable through the barrier cannula, through the plunger barrier and through the annular cone shear and cutter head and into the plunger module.