Applications of LIPSS in polymer medical devices
Medical devices have material that that has a laser induced periodic surface structure (LIPSS) pattern on at least a portion thereof. The LIPSS pattern is provided by exposing a material surface to a pulsed polarized laser energy fluence below the ablation threshold. The LIPSS pattern is useful for purposes such as reducing contact areas on sliding surfaces, increasing total surface area for adhesions, providing anisotropic reinforcement of a material layer or layers, and to provide multiple channels for directing cell growth.
1. A medical device comprising a portion of material that has a laser induced periodic surface structure (LIPSS) pattern on at least a portion of a surface thereof or at an interface between two or more layers of material.
2. A medical device as in claim 1 wherein the material is a polymeric material.
3. A medical device as in claim 2 wherein the polymeric material is selected from the group consisting of silicone resins, phenolic resins, polyolefins, polyvinyls, polyesters, polyacrylates, polyethers, polyamides, polysulfones, cellulosic materials, polystyrene, polyisobutylene, polybutene, polyamide, polycarbonates, polyepoxides, polyacrylonitriles, copolymers of two or more thereof and blends of two or more thereof.
4. A medical device as in claim 2 wherein the polymeric material is a thermoplastic polymer.
5. A medical device as in claim 2 wherein the polymeric material is a thermoset material.
6. A medical device as in claim 1 wherein the device has at least one hole through the LIPSS patterned portion thereof.
7. A medical device as in claim 6 wherein the device is a filter membrane.
8. A medical device as in claim 1 wherein the device includes a tubular polymeric portion having an exterior surface and the LIPSS pattern is formed on at least a portion of said exterior surface.
9. A medical device as in claim 1 wherein the device includes a tubular polymeric portion having an interior lumen surface and the LIPSS pattern is formed on at least a portion of said interior lumen surface.
10. A medical device as in claim 1 wherein the LIPSS pattern is present at an interface between two or more layers of material, the device having surfaces extending transverse to the interface, and the LIPSS pattern providing a plurality of channels extending between said transverse surfaces.
11. A medical device as in claim 1 wherein the LIPSS pattern is annular or polygonal.
12. A medical device as in claim 1 further comprising a biofunctional material applied to at least a portion of the LIPSS patterned surface.
13. A medical device as in claim 1 wherein the device is selected from the group consisting of catheters, balloons, filters, implants for directing neural cell growth, stent placement devices, endoscopes and guide wires.
14. A medical device as in claim 1 wherein the LIPSS pattern is provided at successive interfaces between three or more successive layers of the same or different polymer material, a successive layer overfilling the LIPSS pattern of a preceding layer.
15. A medical device as in claim 14 wherein the polymer material is a thermoset.
16. A medical device as in claim 15 wherein the LIPSS patterns of at least two said successive layer interfaces are non-parallel.
17. A medical device that has two contacting surfaces wherein at least one of said two surfaces has a laser induced periodic surface structure (LIPSS) pattern thereon.
18. A medical device as in claim 17 wherein both said surfaces have a LIPSS pattern thereon.
19. A medical device for vascular access or surgery, the device comprising a tubular polymeric portion having interior and exterior surfaces, at least one of said surfaces having a laser induced periodic surface structure (LIPSS) pattern formed on at least a portion thereof.