Jacket flexible needle assembly
The present teachings relate generally to a medical flexible needle assembly ( 10 ), comprising a needle portion ( 20 ) disposed at a distal end ( 12 ) of the assembly; a stiff portion ( 30 ) disposed at a proximal end 14 of the assembly; an flexible portion disposed between and interconnecting the needle portion and the stiff portion, including a flex distal portion ( 42 ), a flex proximal portion ( 44 ); and a jacketing member ( 50 ) disposed about the assembly ( 10 ) over at least part of the flexible portion ( 40 ); characterized in that the jacketing member ( 50 ) includes one or more coupled regions ( 60 ) and one or more decoupled region ( 70 ), wherein in at least one or more of the one or more coupled regions ( 60 ) are located proximally, distally, or both of the flexible portion ( 40 ).
1. A medical flexible hypotube assembly, comprising:
a tube including:
a. a distal portion disposed at a distal end of the medical flexible hypotube assembly, wherein the distal portion comprises a needle;
b. a stiff portion disposed at a proximal end of the medical flexible hypotube assembly; and
c. a flexible portion disposed between and interconnecting the distal portion and the stiff portion, wherein the flexible portion includes a flex distal portion and a flex proximal portion, wherein the flexible portion is defined by a cut pattern including cut and uncut portions of the tube; and
a jacketing member disposed about the tube over at least part of the flexible portion;
wherein the jacketing member includes a first coupled region that is coupled to the distal portion of the tube, a second coupled region that is coupled to the stiff portion of the tube, and a decoupled region disposed over a length of the cut and uncut portions of the flexible portion between the first coupled region and the second coupled region.
2. The medical flexible hypotube assembly according to claim 1 :
wherein at least one of the first coupled region and the second coupled region are disposed entirely outside of the flexible portion.
3. The medical flexible hypotube assembly according to claim 1 :
wherein at least one of the first coupled region and the second coupled region are disposed within the flexible portion.
4. The medical flexible hypotube assembly according to claim 1 :
wherein the decoupled region is disposed within the flexible portion.
5. The medical flexible hypotube assembly according to claim 1 :
wherein the cut is a spiral cut,
wherein the decoupled region is at least disposed over the spiral cut and away from edges of the spiral cut by an amount greater than 0.0025 mm.
6. The medical flexible hypotube assembly according to claim 1 :
wherein the jacketing member includes a third coupled region disposed between the two coupled regions.
7. The medical flexible hypotube assembly according to claim 6 :
wherein the third coupled region is disposed in-between cuts in the cut pattern, wherein the third coupled region is spaced a distance from the cuts.
8. The medical flexible hypotube assembly according to claim 1 , wherein the decoupled region includes a first longitudinal dimension between a proximal edge and a distal end of the decoupled region and the cut includes a second longitudinal dimension, wherein the first longitudinal dimension is greater than the second longitudinal dimension.
9. A medical flexible hypotube assembly, comprising:
a hypotube comprising:
a. a distal portion disposed at a distal end of the medical flexible hypotube assembly, wherein the distal portion comprises a needle;
b. a stiff portion disposed at a proximal end of the medical flexible hypotube assembly; and
c. a flexible portion disposed between and interconnecting the distal portion and the stiff portion; and
a jacketing member disposed about the hypotube over at least part of the flexible portion;
wherein the jacketing member includes a first coupled region, a second coupled region, and one or more decoupled regions, wherein in the first coupled region is located proximally of the flexible portion and a second coupled region is located distally of the flexible portion,
wherein the flexible portion includes a cut, and
wherein the one or more decoupled regions is disposed over the a cut portion and a non-cut portion of the medical flexible hypotube assembly, and wherein the decoupled region of the jacketing member is decoupled from both the cut portion and the non-cut portion of the medical flexible hypotube.
10. The medical flexible hypotube assembly according to claim 9 :
further characterized in that wherein at least one of the one or more coupled regions are disposed entirely outside of the flexible portion.
11. The medical flexible hypotube assembly according to claim 1 :
wherein the cut feature is a spiral cut.
12. The medical flexible hypotube assembly according to claim 11 :
wherein the decoupled region has a length that is at least two times a width (K) of the spiral cut.
13. The medical flexible hypotube assembly according to claim 11 :
wherein the decoupled region has a length that is at least half a period of the spiral cut.
14. The medical flexible hypotube assembly according to claim 9 , wherein the one or more decoupled regions include a first longitudinal dimension between a proximal edge and a distal end of the one or more decoupled regions and the cut includes a second longitudinal dimension, wherein the first longitudinal dimension is greater than the second longitudinal dimension.