Flexible tubing, cannula and insertion needle

A method of making a medical device comprising:

• providing a kink resistant fluid flow tubing having a length L extending along an axial dimension of the tubing and a fluid flow passage along the length L;
• receiving a first portion of the fluid flow tubing within a channel in a needle, the channel extending from a distal end of the needle along at least a portion of a length of the needle, wherein the needle has a side slot extending along a generally linear section of the needle in a direction of the length of the needle and open to the channel;
• and
• extending a second portion of the fluid flow tubing including a portion of the fluid flow passage out of the channel and through the side slot of the needle;
• wherein the needle is slideable in the axial dimension relative to the fluid flow tubing, to selectively slide off of at least a distal end portion of the fluid flow tubing;
• wherein the method further comprises holding at least some of the second portion of the fluid flow tubing in a fixed position relative to the distal end portion of the fluid flow tubing to inhibit movement of the fluid flow tubing with the needle when the needle is slid off of the distal end portion of the fluid flow tubing;
• and
• wherein the entire portion of the fluid flow tubing located outside of the channel is held in the base, in a fixed position relative to the distal end of the fluid flow tubing.

A medical device comprising:

• a hollow needle having a central channel, a side slot extending along a generally linear section of the needle in a length dimension of the needle and open to the channel, a distal end and an opening at the distal end;
• a fluid flow tubing configured to resist kinking, the tubing having a length L extending along an axial dimension of the tubing, and a circular cross-section shape taken perpendicular to the length dimension, the tubing having a fluid flow passage along the length L and an outside radius R, wherein L/R is equal to or greater than 34.8, the tubing having a distal end and a length portion located within the central channel of the hollow needle, the fluid flow tubing having a portion including a portion of the fluid flow passage that extends out of the channel through the side slot of the needle;
• and
• a base;
• wherein the needle is slideable in the axial dimension relative to the tubing, to selectively slide off of at least the distal end of the tubing, and cause the distal end of the tubing to exit the channel through the opening at the distal end of the needle as the needle is slid at least partially off of the tubing, while the portion of the fluid flow tubing including the portion of the fluid flow passage extends out of the channel through the side slot of the needle;
• wherein at least a portion of the fluid flow tubing outside of the channel of the needle is held by the base in a fixed position relative to the distal end of the fluid flow tubing to inhibit movement of the fluid flow tubing with the needle as the needle is slid off of the distal end of the fluid flow tubing;
• and wherein the entire portion of the fluid flow tubing located outside of the channel is contained in the base, in a fixed position relative to the distal end of the fluid flow tubing.

A medical device comprising a fluid flow tubing configured to resist kinking, the tubing having a length L extending along an axial dimension of the tubing, the tubing having a fluid flow passage, a needle having a channel extending from a distal end of the needle along at least a portion of an axial length dimension of the needle, and a base, wherein the fluid flow tubing is located at least partially within the channel of the needle, wherein the needle has a side slot extending along a generally linear section of the needle in a direction of the axial length dimension of the needle and open to the channel, wherein a portion of the fluid flow tubing including a portion of the fluid flow passage extends out of the channel through the side slot, the fluid flow tubing having a distal end located within the channel of the needle and a second end located outside of the channel of the needle, the needle being slideable in the axial dimension relative to the fluid flow tubing, to selectively slide off of the distal end of the fluid flow tubing, wherein at least some of the portion of the fluid flow tubing extending outside of the channel is held by the base in a fixed position relative to distal end of the fluid flow tubing to inhibit movement of the tubing with the needle as the needle is slid off of the distal end of the fluid flow tubing, and wherein the portion of the fluid flow tubing extending outside of the channel is held by the base in a fixed bend of between about 90° and about 160°.