Sage Journals: Discover world-class research

Abstract

An electromagnetic field focusing probe (EFFP) consists of a radiofrequency generator, solenoidal coil, and a hand-held or catheter probe. The probe is oper ated in the near field (distance within one wave length of an electromagnetic field source) of a coil, which induces eddy current in a biological tissue. The induced eddy current is converged maximally at the tip of the probe upon con tact of the tip with the tissue. The probe produces very high temperatures de pending on the wattage selected.

In this study, the EFFP was used to evaporate atheromatous plaques in hu man cadaver abdominal aorta specimens, which were then studied histologi cally. Gas produced by this technique was analyzed and the volume found to be related to power delivered, but in such small amounts as to be of no embolic significance. While temperature varied with wattage and time of application, it was maximal at the probe tip and easily controlled, resulting in clean oblitera tion of plaque.

Get full access to this article

View all access options for this article.

References

Geschwind HJ , Teisseire B. , Boussignac G. , et al: Laser angioplasty of arterial stenosis . Cardiovasc Intervent Radiol 9:313-317, 1986.

Sanborn A. , Haudenschild CC , Gaber GR , et al: Angiographic and histologic consequences of laser thermal angioplasty; comparison with balloon angioplasty. Circulation 75:1281-1286, 1987.

Rousseau H. , Puel J. , Joffre F. , et al: Self expanding endovascular prothesis: An experimental study . Radiol 164:709-714, 1987.

Sigwart U. , Puel J. , Mirkovitch V. , et al: Intravascular stents to prevent occlusion and restenosis after transluminal angioplasty. N Engl J Med 316:701-706, 1987.

Slager CJ , Essed CE , Schuurbiers Jch , et al: Vaporization of atherosclerotic plaques by spark erosion. J Am Coll Cardiol 5:1382-1386, 1985 .

Lee G. , Seckinger D. , Chan MC , et al: Potential complications of coronary laser angioplasty. Am Heart J 108:1577-1579, 1984 .

Barsoum MS , Mooro HA , Boulous FI , et al: The complications of injection sclerotherapy of bleeding esophageal varices. Br J Surg 69:79-81, 1982.

Yamanashi WS , Patil AA , Valentine JL , et 1: Electromagnetically induced focused heat in the treatment of surgically created aneurysm models . Invest Radiol 22:575-580, 1986.

Lepage JR , Lewis JE , Ruiz OF , et al: Angiopyroplasty using electromagnetically induced focused heat . Angiology 38:520-523, 1987.

10.

Patil AA , Yamanashi WS , Valentine JL , et al: Electromagnetic field focusing probe—a new neurosurgical tool. Acta Neurochir 86:106-110, 1987.

11.

Patil AA , Yamanashi WS , Valentine JL , et al: Electromagnetic field focusing (EFF) probe intravascular endarterectomy—preliminary study. Acta Neurochir, in press, 1988.

12.

Guy AW , Webb MD , McDougall JA : Critical comparison of RF field delivery methods to thermal responses of models and experimental animals. USAF/SAM contract F41609-75-C-0021, final report 1976.

13.

Geschwind H. , Boussignac G. , Teisseire B. , et al: Laser angioplasty: Effects on coronary artery stenosis. Lancet 2:1134, 1983.

14.

Cumberland DC , Sanborn TA , Taylor DI , et al: Percutaneous laser thermal angioplasty: Initial results with a laser probe in total peripheral arterial occlusions . Lancet 1:1457-1459, 1986 .

15.

Lepage JR , Yamanashi WS , Patil AA , et al: Induced current convergence (ICC), a new method for angiopyroplasty, 73rd Scientific Assembly and Ann Meeting, Radiological Society of North America, Chicago, Illinois, Nov-Dec 1987, p 128.

Electromagnetic Field Focusing Probe (EFFP) — A New Angioplasty Tool

Abstract

Get full access to this article

References