Systems and methods for guidewire crossover for bifurcated prostheses

1. An endovascular delivery system, comprising:

an elongate outer tubular sheath having an open lumen and opposed proximal and distal ends, the proximal end of the outer tubular sheath securably disposed to a first handle at a handle assembly;

an elongate inner tubular member having a tubular wall with an open lumen and opposed proximal and distal ends, the inner tubular member being slidably disposed within the open lumen of the outer tubular sheath, the proximal end of the inner tubular member securably disposed to a second handle at the handle assembly;

an elongate crossover guidewire slidably disposed within the outer tubular sheath and having a proximal portion extending from the handle assembly, having a distal portion opposed to the proximal portion and having a medial portion disposed there between; and

a crossover guidewire member having an open lumen extending over at least a portion of the medial portion of the elongate crossover guidewire;

wherein a distal portion of the crossover guidewire member is releasably secured within the endovascular delivery system; and

wherein the distal portion of the crossover guidewire member comprises a tether; and

a release wire configured to releasably secure the crossover guidewire member within the endovascular delivery system.

2. The endovascular delivery system of claim 1 , wherein the distal end of the outer tubular sheath being slidably disposed past and beyond the distal end of the inner tubular member and slidably retractable to a medial portion of the inner tubular member.

3. The endovascular delivery system of claim 1 ,

further comprising an elongate guidewire member having an open lumen and having an elongate guidewire slidably disposed within at least a portion of the elongate guidewire member;

wherein a distal portion of the tether is releasably secured to a proximal portion of the elongate guidewire member.

4. The endovascular delivery system of claim 3 , further comprising:

a securement member secured to the proximal portion of the elongate guidewire member; and

the release wire slidably disposed through the securement member;

wherein the release wire releasably engages the distal portion of the tether.

5. The endovascular delivery system of claim 1 , wherein the crossover guidewire member comprises a polymeric material.

6. The endovascular delivery system of claim 5 wherein the polymeric material for the crossover guidewire member comprises polytetrafluoroethylene.

7. The endovascular delivery system of claim 6 , wherein the polymeric material for the crossover guidewire member further comprises a metallic braid or coil within the polymeric material.

8. The endovascular delivery system of claim 7 , wherein the metallic braid or coil is a braided nitinol tube.

9. The endovascular delivery system of claim 1 , further comprising a bifurcated prosthesis comprising a main tubular body having an open end and opposed ipsilateral and contralateral legs defining a graft wall therein between, the ipsilateral and contralateral legs having open ends;

wherein the bifurcated prosthesis is disposed at a distal portion of the elongate inner tubular member; and

wherein the distal end of the outer tubular sheath is slidably disposed past and beyond the distal end of the inner tubular member to define a prosthesis delivery state and slidably retractable to a medial portion of the inner tubular member to define a prosthesis unsheathed state; and

wherein the medial portion of the elongate crossover guidewire is slidably disposed through the ipsilateral leg of the prosthesis and the distal portion of the elongate crossover guidewire is slidably disposed through the contralateral leg of the main tubular body of the prosthesis in the prosthesis delivery state.

10. An endovascular delivery system, comprising:

an elongate outer tubular sheath having an open lumen and opposed proximal and distal ends, the proximal end of the outer tubular sheath securably disposed to a first handle at a handle assembly;

an elongate inner tubular member having a tubular wall with an open lumen and opposed proximal and distal ends, the inner tubular member being slidably disposed within the open lumen of the outer tubular sheath, the proximal end of the inner tubular member securably disposed to a second handle at the handle assembly;

an elongate crossover guidewire slidably disposed within the outer tubular sheath and having a proximal portion extending from the handle assembly, having a distal portion opposed to the proximal portion and having a medial portion disposed there between;

a crossover guidewire member having an open lumen extending over at least a portion of the medial portion of the elongate crossover guidewire, wherein the elongate crossover guidewire is slidably deployable through the crossover guidewire member; and

a tether having a proximal portion disposed at a distal portion of the crossover guidewire member and a distal portion releasably secured to a release wire slidably disposed within the endovascular delivery system configured to releasably secure the distal portion of the crossover guidewire member within the endovascular delivery system.

11. The endovascular delivery system of claim 10 , further comprising a bifurcated prosthesis comprising a main tubular body having an open end and opposed ipsilateral and contralateral legs defining a graft wall therein between, the ipsilateral and contralateral legs having open ends;

wherein the bifurcated prosthesis is disposed at a distal portion of the elongate inner tubular member; and

wherein the distal end of the outer tubular sheath is slidably disposed past and beyond the distal end of the inner tubular member to define a prosthesis delivery state and slidably retractable to a medial portion of the inner tubular member to define a prosthesis unsheathed state; and

wherein the medial portion of the elongate crossover guidewire is slidably disposed through the ipsilateral leg of the prosthesis and the distal portion of the elongate crossover guidewire is slidably disposed through the contralateral leg of the main tubular body of the prosthesis in the prosthesis delivery state.

12. An endovascular delivery system, comprising:

an elongate outer tubular sheath having an open lumen and opposed proximal and distal ends, the proximal end of the outer tubular sheath securably disposed to a first handle at a handle assembly;

an elongate inner tubular member having a tubular wall with an open lumen and opposed proximal and distal ends, the inner tubular member being slidably disposed within the open lumen of the outer tubular sheath, the proximal end of the inner tubular member securably disposed to a second handle at the handle assembly;

an elongate crossover guidewire slidably disposed within the outer tubular sheath and having a proximal portion extending from the handle assembly, having a distal portion opposed to the proximal portion and having a medial portion disposed there between;

a crossover guidewire member having an open lumen extending over at least a portion of the medial portion of the elongate crossover guidewire, wherein the elongate crossover guidewire is slidably deployable through the crossover guidewire member;

an elongate guidewire member having an open lumen and having an elongate guidewire slidably disposed within at least a portion of the elongate guidewire member;

a tether having a proximal portion and a distal portion, the proximal portion of the tether being integral with a distal portion of the crossover guidewire member;

a securement member secured to a proximal portion of the elongate guidewire member; and

a release wire slidably disposed through the securement member;

wherein the release wire releasably engages the distal portion of the tether; and

wherein a distal portion of the tether is releasably secured to a proximal portion of the elongate guidewire member.

13. The endovascular delivery system of claim 12 ,

wherein the tether is non-tubular.

14. The endovascular delivery system of claim 12 , further comprising a bifurcated prosthesis comprising a main tubular body having an open end and opposed ipsilateral and contralateral legs defining a graft wall therein between, the ipsilateral and contralateral legs having open ends;

wherein the bifurcated prosthesis is disposed at a distal portion of the elongate inner tubular member; and

wherein the distal end of the outer tubular sheath is slidably disposed past and beyond the distal end of the inner tubular member to define a prosthesis delivery state and slidably retractable to a medial portion of the inner tubular member to define a prosthesis unsheathed state;

wherein the elongate guidewire is slidably disposed through the ipsilateral leg of the prosthesis and through the main tubular body of the prosthesis in the prosthesis delivery state; and

wherein the medial portion of the elongate crossover guidewire is slidably disposed through the ipsilateral leg of the prosthesis and the distal portion of the elongate crossover guidewire is slidably disposed through the contralateral leg of the main tubular body of the prosthesis in the prosthesis delivery state.