Method and apparatus for gaining percutaneous access to a body
View Patent ↗The present invention is directed to apparatus and methods for gaining percutaneous access to body anatomy, for example an organ or a body lumen. According to one aspect of the invention, an apparatus is provided comprising a needle and an outer sheath. The needle is receivable within the outer sheath and comprises a plurality of outer diameters. A distal portion of the needle has a lesser diameter than a proximal portion of the needle. Other embodiments are also disclosed.
1. An apparatus for gaining percutaneous access to a body lumen, comprising: a needle, said needle having a distal tip suitable for initial percutaneous puncture into said body lumen, said needle defining an outer surface having a first outer diameter along a distal first length, a second outer diameter along a proximal second length, and a first taper contiguous with said first outer diameter and said second outer diameter intermediate said first length and said second length, said second outer diameter being greater than said first outer diameter; and an outer sleeve terminating at a distal end having a third outer diameter and comprising an outer sleeve lumen extending longitudinally therethrough, a second taper from said third outer diameter at said distal end to a fourth outer diameter greater than said third outer diameter and proximal thereto, and a shaft portion having said fourth outer diameter along a shaft length contiguous with said second taper, said needle being receivable within said outer sleeve lumen with said second taper disposed proximal of said first taper.
2. The apparatus of claim 1 , said needle and said outer sleeve comprising a positioning structure that fixes said needle to said outer sleeve.
3. The apparatus of claim 1 , said needle comprising a marker visible under ultrasound.
4. The apparatus of claim 1 , said needle comprising a marker visible under x-ray.
5. The apparatus of claim 1 , said outer sleeve comprising a marker visible under ultrasound.
6. The apparatus of claim 1 , said outer sleeve being radiopaque.
7. The apparatus of claim 1 , said outer sleeve having a radiopaque distal tip.
8. The apparatus of claim 1 , said needle having a needle lumen longitudinally therethrough, and comprising a radiopaque wire inserted into said lumen.
9. The apparatus of claim 1 , said second taper being in close proximity to said first taper.
10. The apparatus of claim 1 , said second taper having a longitudinal length between on the order of 5 and 50 mm.
11. The apparatus of claim 1 , said second taper defining an outer surface at an acute angle not exceeding on the order of 5° relative to the longitudinal axis of the outer sleeve.
12. The apparatus of claim 1 , said second taper defining an outer surface at an acute angle between on the order of 0.5° and 2° relative to the longitudinal axis of the outer sleeve.
13. The apparatus of claim 1 , said second taper defining an outer surface at an acute angle on the order of 1° relative to the longitudinal axis of the outer sleeve.
14. The apparatus of claim 1 , said distal end having a wall thickness of between on the order 0.0005 and 0.003 inch.
15. A method for gaining percutaneous access to body anatomy, comprising: providing an apparatus for insertion into body anatomy, said apparatus comprising: a needle having a distal tip suitable for initial percutaneous puncture into said body anatomy, said needle having a first outer diameter along a distal first length and a tip at a distal end of said first length suitable for said insertion, a second outer diameter along a proximal second length, and a first taper contiguous with said first outer diameter and said second outer diameter intermediate said first length and said second length, said second outer diameter being greater than said first outer diameter; and an outer sleeve terminating at a distal end having a third outer diameter and comprising an outer sleeve lumen extending longitudinally therethrough, a second taper from said third outer diameter at said distal end to a fourth outer diameter greater than said third outer diameter and proximal thereto, and a shaft portion having said fourth outer diameter along a shaft length contiguous with said second taper, said needle being receivable within said outer sleeve lumen with said second taper disposed proximal of said first taper; and inserting said apparatus into said body anatomy.
16. The method of claim 15 , said body anatomy being a body lumen.
17. The method of claim 15 , said body anatomy being an organ.
18. The method of claim 15 , comprising withdrawing said needle from within said outer sleeve and leaving said outer sleeve within said body anatomy.
19. The method of claim 15 , comprising withdrawing said needle from within said outer sleeve and leaving said outer sleeve within said body anatomy, and inserting a wire guide into said body lumen through said outer sleeve.
20. The method of claim 15 , comprising withdrawing said needle from within said outer sleeve and leaving said outer sleeve within said body anatomy, inserting a wire guide into said body anatomy through said outer sleeve, and withdrawing said outer sleeve from said body anatomy leaving said wire guide in said body anatomy.
21. The apparatus of claim 1 , wherein said needle has a lancet beveled tip.