Flexible needle
An endoscopic instrument comprises a first flexible insertion member sized for insertion through a body lumen to a target site and a needle coupled to the insertion member for penetration of tissue, the needle including a plurality of flexibility enhancing grooves formed therein along at least a first portion of the length of the needle.
1. An endoscopic instrument comprising:
a first flexible insertion member sized for insertion through a body lumen to a target site; and
a needle coupled to the insertion member for penetration of tissue, the needle including a plurality of flexibility enhancing grooves formed therein along at least a first portion of the length of the needle, wherein at least one of the grooves comprises a first needle wall thickness that is less than a second needle wall thickness at a portion of the needle in which the grooves are absent, the first needle wall thickness at the at least one of the grooves preventing fluidic communication between a bore of the needle and the at least one of the grooves, and wherein each of the grooves extends around only a part of a circumference of the needle so that midpoints of the groove extend along a substantially helical path.
2. The instrument of claim 1 , wherein the bore extends axially through the needle, at least a first one of the grooves penetrating from an outer surface of the needle to the bore.
3. The instrument of claim 2 , wherein the bore extends to a distal opening for the injection of fluids to penetrated tissue, fluids also being supplied to tissue via the first groove.
4. The instrument of claim 1 , wherein the grooves are formed in a plane substantially perpendicular to a longitudinal axis of the needle.
5. The instrument of claim 1 , wherein the grooves are positioned substantially equidistant from one another.
6. The instrument of claim 1 , wherein a spacing between the grooves varies along the length of the first portion.
7. The instrument of claim 1 , wherein the first insertion member is sized to be inserted through a working channel of an endoscope.
8. The instrument of claim 1 , further comprising a second flexible insertion member, the first insertion member being slidably received within the second insertion member.
9. The instrument of claim 1 , the first insertion member being formed of a first material and the needle being formed of a second material more rigid than the first material.
10. The instrument of claim 1 , further including a non-porous coating covering the first portion of the length of the needle.
11. The instrument of claim 10 , wherein the coating is an adhesive that covers at least one but less than all of the grooves and adheres the needle to the first insertion member at a location of the less than all the grooves covered by the adhesive.
12. The instrument of claim 1 , wherein a distal most tip of the needle bends toward a longitudinal axis of the needle.
13. A method of forming a needle for use in endoscopic procedures comprising:
fabricating a needle of a material having a first stiffness;
forming a plurality of grooves in at least a first portion of the needle to increase the flexibility of the first portion, wherein at least one of the grooves comprises a first needle wall thickness that is less than a second needle wall thickness at a portion of the needle in which the grooves are absent, the first needle wall thickness at the at least one of the grooves preventing fluidic communication between a bore of the needle and the at least one of the grooves, and wherein each of the grooves extends around only a part of a circumference of the needle so that midpoints of the groove extend along a substantially helical path.
14. The method of claim 13 , wherein at least a first one of the grooves penetrates from an outer surface of the needle to the bore extending axially therethrough.
15. The method of claim 13 , wherein the grooves are formed in a plane substantially perpendicular to a longitudinal axis of the needle.
16. The method of claim 13 , wherein the grooves are positioned substantially equidistant from one another.
17. The method of claim 13 , wherein a spacing between the grooves varies along the length of the first portion.
18. The method of claim 13 , further comprising applying a non-porous coating to the first portion of the needle.
19. The method of claim 18 , wherein the coating is an adhesive that covers at least one but less than all of the grooves and adheres the needle to a first insertion member at a location of the less than all the grooves covered by the adhesive.
20. The method of claim 13 , wherein the needle is fabricated to have a distal most tip that bends toward a longitudinal axis of the needle.