Back to results
US 6,712,787 B1Granted
Self destructive safety syringe
OwnerEdward D. Dysarzinventor
Life of this patent
Estimating the term…
Abstract
A retractable safety syringe that retracts the needle cannula into the plunger module and destroys the syringe to prevent reuse or an accidental needle prick by destroying the plunger barrier and the cannula barrier within the syringe. The needle cannula is released into the plunger module by shearing the cannula barrier and plunger barrier with an internal annular shear and cutter head. The needle cannula module may be replaced with a layer or smaller needle cannula module thereby allowing a greater selection of needle cannulas.
Claims25
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.
5 more elements
A syringe, comprising:
- a syringe body with a distal end, a proximal end and a syringe channel there through from the distal end to the proximal end;
- a needle cannula module having a distal end, a proximal end and a cannula channel extending from the distal end to the proximal end, wherein the cannula channel further is formed into an annular spring guide;
- a needle cannula having a distal end and a proximal end, wherein the distal end projects from and extends beyond the needle cannula module, and the proximal end is within the annular spring guide, and wherein the needle cannula has a channel there through from the distal end to the proximal end and a needle cannula flange formed at the proximal end;
- a plunger module with a distal end, a proximal end, and a plunger channel there through, wherein the distal end is movably disposed in the syringe channel for pushing fluid in the syringe channel to and through the needle cannula for expulsion from the distal end of the needle cannula;
- a barrier cannula connected to the needle cannula module and extending across the proximal end, wherein the needle flange is abutting the barrier cannula, the barrier cannula initially preventing the needle cannula from moving into the syringe body, the barrier cannula having a cannula or channel there through permitting fluid communication between the syringe channel and the needle channel;
- an annular shear and cutter head at the distal end of the plunger module having a distal end, a proximal end, and a shear and cutter head channel formed there through from the distal end to the proximal end;
- a plunger barrier adjacent to the shear and cutter and initially closing off the distal end of the plunger module wherein the plunger barrier is movable with the annular shear and cutter head within the syringe body, wherein the annular shear and cutter head is movable by moving the plunger module to cut the plunger barrier and to shear the barrier cannula to free the needle cannula so that the needle cannula is movable through the annular shear and cutter head and into the plunger module;
- a circumferential latch and a slip over retainer for engaging the circumferential latch, wherein the circumferential latch and the slip over retainer lock the cannula shear and cutter head to the needle cannula module after the annular shear and cutter head has sheared or cut the plunger barrier and the barrier cannula, and wherein the slip over retainer is a notch on an inside surface of the annular shear and cutter head.
5 more elements
A syringe, comprising:
- a syringe body with a distal end, a proximal end, and a syringe channel there through from the distal end to the proximal end;
- a needle cannula module having a distal end, a proximal end and a cannula channel extending from the distal end to the proximal end;
- a needle cannula having a distal end and a proximal end, wherein the distal end projects from and extends beyond the distal end of the needle cannula module and the proximal end is within the cannula channel, and wherein a cannula flange is formed at the proximal end of the needle cannula;
- an inverted cutter head with a distal end and a sharp edge on a proximal end, wherein the distal end is fixed to the needle cannula module and the proximal end is near the proximal end of the needle cannula module;
- a barrier cannula with a distal end, a proximal end, an outer periphery and a cannula that extends from the distal end to the proximal end of the barrier cannula wherein the outer periphery of the barrier cannula is fixed to the distal end of the needle cannula module, and wherein the distal end of the barrier cannula is located proximally from the proximal end of the inverted cutter head;
- a plunger module with a distal end, a proximal end, and a plunger channel there through, wherein the distal end is movably disposed in the syringe channel for pushing fluid in the syringe channel to and through the needle cannula for expulsion from the distal end of the needle cannula;
- a plunger barrier fixed to the distal end of the plunger module, wherein the plunger barrier is moveable with the distal end of the plunger module, wherein the plunger module is urged towards the inverted cutter head, wherein the plunger barrier is urged into the barrier cannula further urging the cannula barrier into the sharp edge of the inverted cutter head, and wherein the inverted sharp edge of the inverted cutter head further cuts or shears a section out of the barrier cannula and then cuts or shears a section out the plunger barrier forming a tunnel in the barrier cannula and the plunger barrier, wherein the needle cannula flange and the needle cannula is released and the needle cannula is allowed to retract into the plunger tunnel.
4 more elements
Dependencies are inferred from the claim text.