Short handle for a long stent
A stent delivery system for delivering a self-expanding stent includes a keel. The keel is used to pass a pushrod and a guidewire into a sheath through the tubular sidewall of the sheath, i.e., not through the lumen opening at the proximal end of the sheath. Accordingly, the entire length of travel of the proximal end of the sheath during deployment of the stent is not required to be inside of the handle, allowing the handle to be short. Since the handle is short, the handle is easy to manipulate.
1. A stent delivery system comprising:
a handle comprising a housing and a keel directly coupled to said housing;
a pushrod having a proximal end connected to said keel of said handle such that said keel and said pushrod do not move relative to said housing;
a stent located over a distal end of said pushrod; and
a sheath constraining said stent at a distal end of said sheath, said keel extending from said housing and into said sheath through a sidewall of said sheath; and a sheath knob attached to a proximal end of said sheath; wherein said sheath knob is threadedly mounted to said housing.
2. The stent delivery system of claim 1 wherein said handle has a linear length less than a linear length of said stent.
3. The stent delivery system of claim 1 wherein said pushrod comprises a guide wire lumen, said stent delivery system further comprising a guide wire extending through said pushrod.
4. The stent delivery system of claim 3 wherein said keel comprises a guide wire port, said guide wire extending out a proximal end of said pushrod, through said keel, and out said guide wire port.
5. The stent delivery system of claim 1 wherein said sheath comprises a pushrod lumen, said keel extending from outside of said sheath, through said tubular sidewall of said sheath, and into said pushrod lumen.
6. The stent delivery system of claim 1 further comprising a strain relief coupled to said handle.
7. The stent delivery system of claim 6 wherein said strain relief relieves strain between said pushrod, said sheath, and said handle.
8. The stent delivery system of claim 1 further comprising a sheath knob bearing rotatably mounting said sheath knob to said sheath.
9. The stent delivery system of claim 1 wherein said sheath comprises a breakaway distal to said keel.
10. The stent delivery system of claim 9 wherein said breakaway extends longitudinally along said sheath.
11. The stent delivery system of claim 9 wherein said breakaway breaks upon contact with said keel.
12. The stent delivery system of claim 11 wherein said breakaway is a region of said sheath having less structural integrity than a remainder of said sheath.
13. The stent delivery system of claim 9 wherein said breakaway is selected from the group consisting of one or more perforations, scores, interlocking teeth, a zipper, and a slit.
14. The stent delivery system of claim 1 wherein said sheath comprises a slit proximal to said keel.
15. The stent delivery system of claim 14 wherein said slit extends longitudinally along said sheath.
16. The stent delivery system of claim 14 wherein said slit comprises a longitudinal cut in said sheath.
17. The stent delivery system of claim 1 wherein said proximal end of said pushrod is directly attached to said keel.
18. The stent delivery system of claim 17 wherein said keel protrudes outside from said housing.