Catheter with distally located integrated circuit radiation generator

• US 4,998,932 A
• Filed: 05/03/1989
• Issued: 03/12/1991
• Est. Priority Date: 05/03/1989
• Status: Expired due to Term

• Current Assignee: AMT Pte Ltd
• Original Assignee: AMT Pte Ltd
• Inventors: Rosen, Har'el, Rosen, Arye
• Primary Examiner(s): HINDENBURG, MAX F
• Application Number:
  US07/346,873
• Time in Patent Office: 678 Days
• Field of Search: 128/395-398, 128/634, 128/664, 128/665, 606/13-15, 606/27-31
• US Class Current: 606/29
• CPC Class Codes: A61B 18/18 by applying electromagnetic radiation, e.g. microwaves radiation therapy A61N5/00
• CPC Class Codes: A61B 18/1815 using microwaves
• CPC Class Codes: A61B 18/20 using laser
• CPC Class Codes: A61B 2017/22001 Angioplasty, e.g. PCTA
• CPC Class Codes: A61B 2017/22038 with a guide wire
• CPC Class Codes: A61M 25/104 used for angioplasty

Abstract

A catheter includes at least two electrical conductors extending from the proximal to the distal ends. A semiconductor chip generator of electromagnetic radiation is located at the distal end and is energized by electrical power supplied by the electrical conductors. The chip may be a laser or include an oscillator for generating electromagnetic radiation at a selected frequency or frequencies. In one embodiment, two chip radiation generators are located distally, each connected to one of the conductors. A third conductor is connected in common to both chips, whereby they may be energized independently. An axial aperture may be provided for a guide wire. A balloon may surround the distal end of the catheter, and may be inflated by way of another axial aperture.

Claims

1. A catheter, comprising:

a semiconductor oscillator including first and second electrodes adapted for the application of energizing voltage thereto for generating electromagnetic radiation in response to application of said energizing voltage;

an elongated electrically insulating piece defining proximal and distal ends, said distal end being adapted to be introduced into a vas;

first and second elongated electrical conductive means electrically isolated by at least said elongated electrically insulating piece, said first and second elongated electrically conductive means each defining proximal and distal ends;

first electrical connecting means coupled to said first electrode of said semiconductor oscillator and to said distal end of said first elongated conductive means for providing electrical continuity therebetween;

second electrical connecting means coupled to said second electrode of said semiconductor radiation emitter and to said distal end of said second elongated conductive means for providing electrical continuity therebetween; and

mechanical connecting means coupled to said oscillator and to said electrically insulating piece for mechanical coupling thereof to form an assemblage which is adapted to be introduced into a vas.

2. A catheter according to claim 1 wherein said proximal ends of said first and second conductive means are adapted to be coupled to the terminals of a source of direct voltage.

3. A catheter according to claim 1 wherein said proximal ends of said first and second conductive means are adapted to be coupled to the terminals of a source of pulsed direct voltage.

4. A catheter according to claim 1 wherein said semiconductor oscillator comprises a laser.

5. A catheter according to claim 1 further comprising means for enhancing the transition from said oscillator to regions exterior of said catheter.

6. A catheter according to claim 5 wherein said means for enhancing comprises an antenna.

7. A catheter according to claim 1 wherein said elongated electrically insulating piece defines an axial aperture.

8. A catheter according to claim 7 further comprising a guide filament extending at least part-way through said axial aperture.

9. A catheter, comprising:

a semiconductor radiation emitter including first and second electrodes adapted for the application of energizing voltage thereto;

an elongated electrically insulating piece defining proximal and distal ends, said distal end being adapted to be introduced into a vas;

first and second elongated electrical conductive means electrically isolated by at least said elongated electrically insulating piece, said first and second elongated electrically conductive means each defining proximal and distal ends;

first connecting means coupled to said first electrode of said semiconductor radiation emitter and to said distal end of said first elongated conductive means for providing electrical continuity therebetween; and

second connecting means coupled to said second electrode of said semiconductor radiation emitter and to said distal end of said second elongated conductive means for providing electrical continuity therebetween;

and further comprising a second semiconductor radiation emitter, including first and second electrodes for the application of energizing voltage thereto.

10. A catheter according to claim 9 further comprising third connecting means for electrically connecting radiation emitter to said distal end of said first elongated conductive means.

11. A catheter according to claim 10 further comprising:

a third elongated electrically conductive means electrically independent of said first and second elongated electrically conductive means, said third elongated electrically conductive means defining proximal and distal ends; and

fourth connecting means coupled to said distal end of said third elongated electrically conductive means and to said second electrode of said second semiconductor radiation emitter for providing electrical continuity therebetween.

12. A catheter according to claim 11 wherein said first semiconductor radiation emitter comprises a laser for radiating electromagnetic energy in the form of light defining a frequency and said second semiconductor radiation emitter comprises an electrical oscillator for radiating electromagnetic energy having a natural frequency below that of the light radiated by said laser.

13. A catheter according to claim 12 further comprising an antenna located adjacent said distal end of said insulating piece and electrically coupled to said electrical oscillator for directing radiation at the frequency of said electrical oscillator.

14. A method for performing angioplasty, comprising the steps of:

introducing into a vas the distal end of a cable including elongated mutually electrically insulated multiple electrical conductors, near the distal end of which is located an oscillator adapted for, when electrically energized, producing electromagnetic radiation at least somewhat capable of penetrating through flesh;

positioning said distal end of said cable adjacent a region to which electromagnetic radiation is to be applied;

applying direct electrical power across at least two of said electrical conductors to thereby energize said oscillator for causing said radiation; and

ceasing said applying step after a predetermined time.

15. A catheter, comprising:

first and second elongated, mutually electrically insulated electrical conductors defining proximal and distal ends, said proximal ends being adapted for being coupled to a source of electrical power defining a first frequency, which frequency may include zero frequency; and

frequency conversion means connected near said distal end of said first and second conductors and, together with said conductors, being dimensioned and arranged for introduction of at least said distal end into a vas, for generating electromagnetic radiation at a frequency different from said first frequency, and for coupling said electromagnetic radiation to surrounding tissue.

16. A catheter according to claim 15 further comprising means for preventing body fluids from coming into contact with said frequency conversion means.