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Method and apparatus for providing light-activated therapy

  • US 5,445,608 A
  • Filed: 08/16/1993
  • Issued: 08/29/1995
  • Est. Priority Date: 08/16/1993
  • Status: Expired due to Term
First Claim
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1. A method for photodynamic treatment at an internal, in vivo treatment site, to cause a desired therapeutic change, comprising the steps of:

  • (a) applying a photoreactive agent to the internal, in vivo treatment site, said photoreactive agent being selected for one or more characteristic wavelengths or wavebands of light absorption;

    (b) positioning a light source that directly generates light internally within a patient'"'"'s body, said light source being transcutaneously delivered to the in vivo treatment site and left implanted within the patient'"'"'s body during the photodynamic treatment, the light emitted by the light source having one or more emission wavelengths or wavebands substantially equal to a wavelength or waveband of absorption of the photoreactive agent; and

    (c) administering the light emitted from the light source to the internal, in vivo treatment site, said light being absorbed by the photoreactive agent, which then causes the desired therapeutic change at the treatment site.

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