Implantable medical devices, systems and components thereof
An implantable medical therapy delivery device includes a non-conductive filament extending along a length of an outer surface of an insulative body of the device, wherein the filament includes a plurality of fixation projections and is secured to the outer surface of the insulative body such that the projections protrude outward from the outer surface and are spaced apart from one another along the length of the outer surface. The filament may be wound about the length with an open pitch. In some cases, the insulative body includes an open-work member forming at least a portion of the outer surface thereof, and the filament may be interlaced with the open-work member. In these cases, the filament may be bioabsorbable, for example, to provide only acute fixation via the projections thereof, while the open-work member provides a structure for tissue ingrowth and, thus, more permanent or chronic fixation.
1. A device comprising:
an elongate body configured to be inserted in a patient, the elongate body defining an outer surface, and the elongate body comprising an open-work member that defines at least a first portion of a length of the outer surface of the elongate body; and
a filament, including a plurality of fixation projections protruding from the filament and configured to engage tissue of the patient, the filament extending along a second portion of the length of the outer surface of the elongate body and being interlaced with the open-work member, wherein the fixation projections are spaced apart from one another along the second portion of the length of the outer surface.
2. The device of claim 1 , wherein the fixation projections protrude outward from the outer surface.
3. The device of claim 1 , wherein the first portion of the length and the second portion of the length are coextensive.
4. The device of claim 1 , wherein:
the filament comprises a first filament, the plurality of fixation projections comprises a first plurality of fixation projections, and the open-work member comprises a first open-work member,
the elongate body further comprises a second open-work member defining at least a third portion of the length of the outer surface of the elongate body, and
the device further comprises a second filament including a second plurality of fixation projections protruding from the filament and configured to engage tissue of the patient, the second filament extending along a fourth portion of the length of the outer surface of the elongate body and being interlaced with the second open-work member, wherein the second plurality of fixation projections of the second filament are spaced apart from one another along the fourth portion of the length of the outer surface.
5. The device of claim 1 , wherein:
the open-work member of the elongate body comprises a first open-work member defining the first portion of the length of the outer surface,
the elongate body further comprises a second open-work member, the second open-work member defining a third portion of the length of the outer surface, and
wherein the filament is interlaced with the second open-work member.
6. The device of claim 1 , wherein:
the filament comprises a first filament, and
wherein the device further comprises a second filament interlaced with the open work member.
7. The device of claim 1 , wherein the open-work member comprises at least one of a perforated tube, a braided mesh, or a fabric woven from a plurality of monofilaments.
8. The device of claim 1 , wherein the filament comprises a bioabsorbable material.
9. The device of claim 1 , wherein the first portion includes an entirety of the second portion.
10. The device of claim 1 , wherein the filament is at least one of stitched through apertures of the open work member, braided into a structure of the open-work member as the open-work member is formed, or weaved into the structure of the open work member as the open work member is formed.
11. The device of claim 1 , wherein the open-work member is secured to the elongate body by at least one of adhesive bonding or by reflowing a portion of the elongate body.
12. The device of claim 1 , wherein the open-work member comprises apertures configured to provide spaces along the outer surface of the elongate body for tissue ingrowth.
13. The device of claim 1 , wherein the filament is interlaced with the open-work member such that the filament extends along a substantially straight line.
14. The device of claim 1 , wherein the filament is interlaced with the open-work member such that the filament winds with an open pitch around the outer surface of the elongate body.
15. The device of claim 1 , wherein the open-work member is at least one of biostable or non bioabsorbable and the filament is bioabsorbable.
16. The device of claim 1 , wherein the open-work member is tubular.
17. The device of claim 1 , wherein the filament is non-conductive.
18. The device of claim 1 , wherein the elongate body is insulative, and the device further comprises at least one conductor within and extending through the elongate body.
19. The device of claim 1 , wherein the device comprises an implantable lead comprising at least one electrode coupled to the at least one conductor.
20. A device comprising:
an elongate body configured to be inserted in a patient, the elongate body defining an outer surface, and the elongate body comprising a tubular open-work member that defines at least a first portion of a length of the outer surface of the elongate body, wherein the open-work member comprises apertures configured to provide spaces along the outer surface of the elongate body for tissue ingrowth; and
a filament, including a plurality of fixation projections protruding from the filament and configured to engage tissue of the patient, the filament extending along a second portion of the length of the outer surface of the elongate body and being interlaced with the open-work member, wherein the fixation projections are spaced apart from one another along the second portion of the length of the outer surface and protrude outward from the outer surface.