Catheters and related devices and methods of manufacture
Catheters incorporating a thin film polymeric layer or layers. The thin film may have a wall thickness of about 0.00025″ +/− less than 0.0001″ to about 0.0015″ +/−0.0002″, for example. The thin film may be formed by extruding a sheet and cutting the sheet into elongate ribbons, each having two opposing long edges. The ribbon may be rolled or wrapped to define a tubular shape with a gap between the long edges. Heat and pressure may be applied to close the gap, abut the edges and form a longitudinal joint. The joint may extend along a portion of the length of the tubular shaft or most of the length of the tubular shaft. The tubular-shaped thin film layer may have a uniform wall thickness around the circumference, and the uniform wall thickness may extend across the joint.
1. A catheter, comprising: an elongate tubular shaft having a proximal end, a distal end, a length, a longitudinal axis and a lumen extending therethrough, wherein the tubular shaft includes a saddle portion having a distal facing, terminal trailing edge disposed proximal of the distal end of the elongate tubular shaft, a lubricious polymeric inner liner extending through the saddle portion, a reinforcement coil disposed about the lubricious polymeric inner liner, and a thin film polymeric layer disposed about the saddle portion, wherein the distal facing, terminal trailing edge of the saddle portion includes a plurality of peninsular members defining a plurality of embayments, and wherein the thin film polymeric layer extends through the embayments to the lubricious polymeric inner liner in the saddle portion such that the thin film polymeric layer is connected to and extends from the distal-facing trailing edge.
2. A catheter as in claim 1 , wherein the reinforcement coil is metallic.
3. A catheter as in claim 1 , wherein the thin film has a thickness less than 0.0015″+/−0.0002″.
4. A catheter as in claim 1 , wherein the thin film has a thickness less than 0.0010″+/−0.00013″.
5. A catheter as in claim 1 , wherein the thin film has a thickness less than 0.00075″+/−0.0001″.
6. A catheter as in claim 1 , wherein the thin film has a thickness less than 0.0005″+/− less than 0.0001″.
7. A catheter as in claim 1 , wherein the saddle portion includes a proximal-facing leading edge configured at an acute angle relative to the longitudinal axis and having a plurality of notches, and wherein the thin film polymeric layer extends through the notches to the lubricious polymeric inner liner in the saddle portion.
8. A catheter as in claim 1 , wherein the reinforcement coil and the saddle portion are separate components joined together.
9. A catheter as in claim 1 , wherein the embayments form a saddle interlocking portion and the thin film polymeric layer forms a complementary interlocking portion engaged with the saddle interlocking portion to form a mechanically interlocking connection between the saddle portion and the thin film polymeric layer.
10. A catheter, comprising: an elongate rod, a saddle member connected to a distal end of the rod, and an elongate tubular shaft extending from a distal end of the saddle member, a lubricious polymeric inner liner extending through the tubular shaft and the saddle member, a reinforcement coil disposed about the lubricious polymeric inner liner, a thin film polymeric layer extending over the tubular shaft and saddle member, wherein the saddle member includes a distal facing, terminal trailing edge having a plurality of peninsular members defining a plurality of embayments, and wherein the thin film polymeric layer extends through the embayments to the lubricious polymeric inner liner in the saddle member such that the thin film polymeric layer is connected to, and extends from, the distal-facing, terminal trailing edge.
11. A catheter as in claim 10 , wherein the reinforcement coil and the saddle member are separate components joined together.
12. A catheter as in claim 10 , wherein the embayments form a saddle interlocking portion and the thin film polymeric layer forms a complementary interlocking portion engaged with the saddle interlocking portion to form a mechanically interlocking connection between the saddle member and the thin film polymeric layer.
13. A catheter, comprising: an elongate rod, a saddle member connected to a distal end of the rod, and an elongate tubular shaft extending from a distal end of the saddle member, a lubricious polymeric inner liner extending through the tubular shaft and the saddle member, a coil disposed about the inner liner, and a thin film polymeric layer extending over the coil and saddle member, wherein the coil has a proximal end and a distal end and wherein the coil comprises a core and a jacket, wherein the core has a first attenuation coefficient when radiated by a first X-ray radiation, and the jacket has a second attenuation coefficient when radiated by the first X-ray radiation, the first attenuation coefficient being greater than the second attenuation coefficient, and wherein adjacent turns of the coil at the proximal and distal ends thereof contact each other and are welded together, and wherein the saddle member includes a distal-facing, terminal trailing edge that includes a plurality of peninsular members defining a plurality of embayments, and wherein the thin film polymeric layer extends through the embayments to the lubricious polymeric inner liner in the saddle member such that the thin film polymeric layer is connected to, and extends from, the distal-facing, terminal trailing edge.
14. A catheter as in claim 13 , wherein the core comprises tantalum.
15. A catheter as in claim 13 , wherein the jacket comprises a spring-tempered metal alloy.
16. A catheter as in claim 13 , wherein the jacket comprises stainless steel.
17. A catheter as in claim 13 , wherein the coil and the saddle member are separate components joined together.
18. A catheter as in claim 13 , wherein the embayments form a saddle interlocking portion and the thin film polymeric layer forms a complementary interlocking portion engaged with the saddle interlocking portion to form a mechanically interlocking connection between the saddle member and the thin film polymeric layer.