Stimulation of cell growth at implant surfaces
First Claim
1. A medical device comprising a first medical device portion comprising a first tissue contacting surface that is configured to undergo a time-dependent variation in surface charge at a site of contact with a host, in response to a time-dependent signal, wherein said first tissue contacting surface undergoes said time-dependent variation in surface charge using energy provided by said host, and said first tissue contacting surface is configured to experience a phasic variation in strain when in contact with said host and wherein said first tissue contacting surface comprises a material that produces a surface charge in response to mechanical deformation due to said phasic variation in strain.
2 Assignments
0 Petitions
Accused Products
Abstract
The present invention is directed to medical devices that contain at least one tissue contacting surface that is configured to undergo a variation in surface charge in response to a time-dependent signal. Such a variation in surface charge is provided, for example, to enhance or inhibit cellular growth adjacent to, on, or within the at least one tissue contacting surface.
-
Citations
69 Claims
- 1. A medical device comprising a first medical device portion comprising a first tissue contacting surface that is configured to undergo a time-dependent variation in surface charge at a site of contact with a host, in response to a time-dependent signal, wherein said first tissue contacting surface undergoes said time-dependent variation in surface charge using energy provided by said host, and said first tissue contacting surface is configured to experience a phasic variation in strain when in contact with said host and wherein said first tissue contacting surface comprises a material that produces a surface charge in response to mechanical deformation due to said phasic variation in strain.
-
63. A medical device comprising a first medical device portion comprising a first tissue contacting surface that is configured to undergo a time-dependent variation in surface charge at a site of contact with a host, in response to a time dependent signal, wherein said first tissue contacting surface undergoes said time-dependent variation in surface charge using energy provided by said host;
- and wherein said first tissue contacting surface is exposed to an ion containing bodily fluid that undergoes a phasic variation in flow velocity and wherein said implant provides a magnetic field that is perpendicular to the direction of said flow.
-
65. A medical device comprising a first medical device portion comprising a first tissue contacting surface that is configured to undergo a time-dependent variation in surface charge at a site of contact with a host, in response to a time-dependent signal, wherein said non-negative surface charge is a neutral surface charge.
-
66. A medical device comprising a first medical device portion comprising a first tissue contacting surface that is configured to undergo a time-dependent variation in surface charge at a site of contact with a host, in response to a time-dependent signal, an electrical stimulator that generates said variation in surface charge, said stimulator comprising a power source, wherein said first medical device portion comprises a first electrode disposed at or beneath said first tissue contacting surface, which provides said time-dependent variation in surface charge, said time-dependent variation in surface charge being effective to enhance or inhibit cellular growth adjacent to, on, or within said first tissue contacting surface, and wherein said first electrode comprises one or more conductive filaments.
-
67. A medical device further comprising an electrical stimulator that generates said variation in surface charge, said stimulator comprising a power source, wherein said first medical device portion comprises a first electrode disposed at or beneath said first tissue contacting surface, which provides said time-dependent variation in surface charge, said time-dependent variation in surface charge being effective to enhance or inhibit cellular growth adjacent to, on, or within said first tissue contacting surface, and wherein said first medical device portion further comprises a second tissue contacting surface which is configured to undergo a time-dependent variation in surface charge at a site of contact with said host, said second time-dependent variation in surface charge being effective to enhance or inhibit cellular growth adjacent to, on, or within said second tissue contacting surface, and a second electrode disposed at or beneath said second tissue contacting surface, which provides said time-dependent variation in surface charge at said second tissue contacting surface, wherein said first and second electrodes each comprise one or more conductive filaments.
-
68. A medical device comprising a first medical device portion comprising a first tissue contacting surface that is configured to undergo a time-dependent variation in surface charge at a site of contact with a host, in response to a time-dependent signal, wherein said first tissue contacting surface is provided with a d.c. bias potential and wherein said first medical device portion comprises a first electrode disposed at or beneath said first tissue contacting surface which provides said time-dependent variation in surface charge, and wherein said d.c. bias potential is provided by imposing a d.c. bias voltage on said first electrode.
-
69. A method for manufacturing a medical device comprising a piezoelectric or electrostrictive film having a blood contacting surface and further comprises a first medical device portion comprising a first tissue contacting surface that is configured to undergo a time-dependent variation in surface charge at a site of contact with a host, in response to a time-dependent signal comprising:
-
providing a medical device; applying a piezoelectric or electrostrictive polymer film on a blood-contacting surface of the medical device, and further comprising etching the film in a predetermined pattern.
-
Specification