Laser therapy assembly for muscular tissue revascularization

• US 6,551,308 B1
• Filed: 05/19/2000
• Issued: 04/22/2003
• Est. Priority Date: 09/17/1997
• Status: Expired due to Fees

• Current Assignee: Laser-Und Medizin-Technologie Gmbh Berlin
• Original Assignee: Laser-Und Medizin-Technologie Gmbh Berlin
• Inventors: Schaldach, Brita, Muller, Gerhard, Desinger, Kai
• Primary Examiner(s): Shay, David M.
• Application Number:
  US09/508,935
• Time in Patent Office: 1,068 Days
• Field of Search: 606/2-19, 604/22
• US Class Current: 606/10
• CPC Class Codes: A61B 17/320068 using mechanical vibrations, e.g. ultrasonic A61B17/22012 takes precedence; dental tooth drilling devices operated by vibration A61C3/03; removing intra-ocular material using mechanical vibrations A61F9/00745
• CPC Class Codes: A61B 18/20 using laser
• CPC Class Codes: A61B 2017/00247 Making holes in the wall of the heart, e.g. laser Myocardial revascularization
• CPC Class Codes: A61B 2017/320069 for ablating tissue
• CPC Class Codes: A61B 2018/00392 Transmyocardial revascularisation

Abstract

A laser therapy assembly (1) for the revascularization of muscular tissues (t), especially cardiac muscular tissue, with a laser source (2) and an optical coupling unit (9, 11) for transmitting the laser beam (L) into the muscular tissue, with an ultrasound generator (6) connected to the optical coupling unit for a transfer of heat to the muscular tissue, which can be regulated independently from the laser beam with the purpose of producing a thermal effect that can be separately adjusted, especially a marginal thermal necrosis, in a channel generated in the muscular tissue.

Claims

1. A laser therapy assembly for revascularizing muscular tissue, comprising:

a laser source coupled to an optoacoustic optical fiber for transmitting a laser beam through the optoacoustic optical fiber to the muscular tissue;

an ultrasound generator rigidly connected to the optoacoustic optical fiber for transferring heat through the optoacoustic optical fiber to the muscular tissue, the ultrasound generator being regulated independently from the laser beam to produce a thermal effect that can be separately adjusted, the laser source, the ultrasound generator, and the optoacoustic optical fiber being housed in a tube to form a handpiece;

a drive device coupled to the ultrasound generator to effect a common axial movement of both the ultrasound generator and the optoacoustic optical fiber within the handpiece; and

a control unit external to the handpiece coupled to both the ultrasound generator and to the laser source for respective power control of the ultrasound generator and the laser source.

2. The laser therapy assembly according to claim 1, wherein the handpiece includes a positioning device at a handpiece end distal from the laser source for attachment to the muscular tissue and for guidance of the optoacoustic optical fiber in the common axial movement.

3. The laser therapy assembly according to claim 1, wherein the control unit includes a control device for control of the common axial movement of both the ultrasound generator and the optoacoustic optical fiber and for synchronization of the common axial movement with activation of the laser source and the ultrasound generator as a function of a heart signal.

4. The laser therapy assembly according to claim 1, wherein the laser source is a Q-switched neodymium-YAG laser whose pulse energy is adjusted such that in an operating field an optical perforation can be obtained on the muscular tissue.

5. The laser therapy assembly according to claim 1, wherein the ultrasound generator operates in the frequency range between 30 and 50 kHz.

6. The laser therapy assembly according to claim 1, wherein the ultrasound generator operates in the frequency range between 20 and 100 kHz.

7. The laser therapy assembly according to claim 1, wherein the muscular tissue is cardiac muscular tissue.

8. The laser therapy assembly according to claim 1, wherein the thermal effect that can be separately adjusted is a marginal thermal necrosis in a channel generated in the muscular tissue.