Length-adjustable ossicular prosthesis
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United States of America Patent
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N/A
Issued Date -
May 22, 2003
app pub date -
Oct 2, 2002
filing date -
Oct 4, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A middle ear prosthesis that is length-adjustable in a post-implantation period to accommodate tensions in tissue caused by healing. The ossicular prosthesis can be used in total and partial ossicular replacement surgeries and can take the form of (i) an active prosthesis, (ii) a partially-active prosthesis, or (iii) a passive prosthesis. In a preferred embodiment, the prosthesis is partially-active and comprises first and second body portions that slidably mate to alter the overall prosthesis length. An engagement or locking mechanism is provided to lock the first and second body portions in a selected position to thereby provide a selected length. In another embodiment, the prosthesis carries a photothermal micropump for moving fluid between first and second chambers to adjust the prosthesis length. In another embodiment, the prosthesis has a medial portion of a shape memory polymer (SMP) that changes length in response to thermal effects, with the SMP covered with an effective insulator layer to prevent substantial thermal effects in the middle ear.
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