초록 ▼

Minimally invasive techniques utilized in bypass grafting are disclosed. For instance, a method of implanting an end portion of a graft in the body of a patient during a bypass grafting procedure includes the steps of (i) advancing a medical instrument within a circulatory system of said body, (ii)

Minimally invasive techniques utilized in bypass grafting are disclosed. For instance, a method of implanting an end portion of a graft in the body of a patient during a bypass grafting procedure includes the steps of (i) advancing a medical instrument within a circulatory system of said body, (ii) guiding a distal end of said medical instrument out of said circulatory system through an opening defined in said circulatory system after said medical instrument advancing step, (iii) advancing said end portion of said graft within said medical instrument after said guiding step, and (iv) securing said end portion of said graft to a blood vessel of said circulatory system after said end portion advancing step.

대표청구항 ▼

Minimally invasive techniques utilized in bypass grafting are disclosed. For instance, a method of implanting an end portion of a graft in the body of a patient during a bypass grafting procedure includes the steps of (i) advancing a medical instrument within a circulatory system of said body, (ii)

Minimally invasive techniques utilized in bypass grafting are disclosed. For instance, a method of implanting an end portion of a graft in the body of a patient during a bypass grafting procedure includes the steps of (i) advancing a medical instrument within a circulatory system of said body, (ii) guiding a distal end of said medical instrument out of said circulatory system through an opening defined in said circulatory system after said medical instrument advancing step, (iii) advancing said end portion of said graft within said medical instrument after said guiding step, and (iv) securing said end portion of said graft to a blood vessel of said circulatory system after said end portion advancing step. d hub, said sleeve being disposed about said hub between said shoulder and said flange, said sleeve having a sharpened proximal end disposed substantially against a distal surface of said flange, said sleeve having at least one inward projection located distally to said cutting surface; an elongate needle having a fluid path therethrough, said needle having a pointed distal end and a proximal end connected to said passageway of said hub so that when said hub is disposed in said receiver in at said distal end of said barrel, said pointed end of said needle extends distally outwardly and said fluid path of said needle is in fluid communication with said chamber of said barrel; an elongate spring disposed about said hub sufficiently compressed to provide a bias between said receiver and said flange so that when a force greater than a force required to expel fluid from said chamber is applied to said plunger, said hub is moved distally in said receiver against said bias of said spring a sufficient distance to cause said cutting surface of said sleeve to engage and to cut through said flange and to engage said at least one inward projection on said sleeve against said hub to allow said cutting surface of said sleeve to cut through said stopper to expose said cavity in said plunger thereby to allow said bias of said spring to urge a sufficient movement of said hub into said cavity in said plunger to retract said needle to a position within said syringe where inadvertent contact with said pointed distal end is substantially prevented. 2. The retractable needle syringe of claim 1 wherein said distal end of said plunger further includes an anvil and said stopper includes a proximal void, said anvil being disposed within said void in said stopper to engage said cutting surface of said sleeve when said cutting surface of said sleeve engages said stopper, said anvil thereby facilitating the cut by said cutting surface through said stopper to expose said cavity in said plunger. 3. The retractable needle syringe of claim 2 wherein said anvil is formed from a metallic material. 4. The retractable needle syringe of claim 1 wherein said receiver is sized so that said open distal end of said barrel defining said receiver is sized and shaped to allow a slidable movement of said hub while retaining said spring about said hub. 5. The retractable needle syringe of claim 1 wherein said sleeve is formed into a tapered shape wherein said proximal end of said sleeve has a smaller diameter than a distal end of said sleeve, thereby facilitating a stretching of said stopper when said resilient stopper is cut by said cutting surface. 6. The retractable needle syringe of claim 5 wherein said sleeve is formed from a metallic material. 7. The retractable needle syringe of claim 6 wherein said sleeve is subjected to an electrochemical treatment thereby enhancing said cutting surface's sharpness properties. 8. The retractable needle syringe of claim 6 wherein said metallic material is stainless steel. 9. The retractable needle syringe of claim 1 wherein said proximal end of said barrel further comprises a finger flange for assisting a practitioner's grip of said syringe during a use. 10. The retractable needle syringe of claim 9 wherein said finger flange further includes a collar projecting proximally a sufficient distance, said collar being disposed and shaped to receive a removable cap for covering said plunger and wherein said receiver at said distal end of said barrel is shaped to receive a removable shield for protecting said sharp distal end of said needle. 11. The retractable needle syringe of claim 10 wherein said cap disposed on said collar and said shield disposed on said receiver is sufficiently to substantially prevent passage of any microorganisms beyond said cap and said shield, and wherein said syringe is exposed to conditions that substantially render any microorganisms therein non-viable. 12. The retractable needle syringe of claim 11 wher