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US5755754A Expired / Lapsed US ⏱️ 0.0 years remaining

Device and method for asymmetrical thermal therapy with helical dipole microwave antenna

Assignee: Auslo Research LLC
•
Filing: 1996-07-19
•
Granted: 1998-05-26
•
Expires: 2016-07-19
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Abstract

Abstract An intraurethral, Foley-type catheter shaft contains a microwave antenna capable of generating a cylindrically symmetrical thermal pattern, within which temperatures are capable of exceeding 45° C. The antenna, which is positioned within the shaft, is surrounded by means within the shaft for absorbing thermal energy conducted by the tissue and asymmetrically absorbing electromagnetic energy emitted by the antenna--a greater amount of electromagnetic energy being absorbed on one side of the shaft. This asymmetrical absorption alters the thermal pattern generated by the microwave antenna, making it cylindrically asymmetrical, which effectively focuses microwave thermal therapy toward undesirous benign tumorous tissue growth of a prostate anterior and lateral to the urethra, and away from healthy tissue posterior to the urethra.

Inventors

  • 👤 Eric N. Rudie
  • 👤 Bruce H. Neilson
  • 👤 James V. Kauphusman

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-10 01:18
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/18; A61B18/1815; A61N; A61N5/00; A61N5/02; A61N5/04; A61N5/045; A61B17/00; A61B17/00234; A61B2017/00238; A61B2017/00274; A61B2018/00315; A61B2018/00547; A61M; A61M25/00; A61M25/10

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 140 words
A heat therapy system for prostate treatment comprising: an elongate probe sized for insertion into a urethra; an electromagnetic energy system comprising an electromagnetic energy generator external to the probe, an electromagnetic energy transmission line carried by the probe and electrically connectable to the generator, and a radiating antenna carried by the probe and being electrically connected to the transmission line, wherein the electromagnetic energy generator is capable of generating sufficient electromagnetic energy at a frequency of about 915 MHz to produce via the radiating antenna heat in the prostate in excess of 45° C.; and a cooling system carried by the probe and surrounding the antenna, the cooling system permitting a circulation of coolant around the antenna, wherein the volume of coolant is greater on a first side of the probe than on a second side of the probe.
Claim 2
Dependent Claim 140 words
A heat therapy system for prostate treatment comprising: an elongate probe sized for insertion into a urethra; an electromagnetic energy system comprising an electromagnetic energy generator external to the probe, an electromagnetic energy transmission line carried by the probe and electrically connectable to the generator, and a radiating antenna carried by the probe and being electrically connected to the transmission line, wherein the electromagnetic energy generator is capable of generating sufficient electromagnetic energy at a frequency of about 915 MHz to produce via the radiating antenna heat in the prostate in excess of 45° C.; and a cooling system carried by the probe and surrounding the antenna, the cooling system permitting a circulation of coolant around the antenna, wherein the volume of coolant is greater on a first side of the probe than on a second side of the probe.
Claim 3
Independent Claim 106 words
A method of providing a heat therapy to a prostate via a urethra without damaging rectal tissue, the method comprising: inserting a probe carrying a radiating antenna into the urethra to a level of the prostate; circulating a coolant around the radiating antenna, between the radiating antenna and the urethra, the volume of coolant being greater in the vicinity of the urethra adjacent to the rectal tissue than in the vicinity of the urethra distant from the rectal tissue; and driving the antenna with electromagnetic energy at a frequency of about 915 MHz to selectively necrose prostate tissue without necrosing the urethra and the rectal tissue.
Claim 4
Independent Claim 106 words
A method of providing a heat therapy to a prostate via a urethra without damaging rectal tissue, the method comprising: inserting a probe carrying a radiating antenna into the urethra to a level of the prostate; circulating a coolant around the radiating antenna, between the radiating antenna and the urethra, the volume of coolant being greater in the vicinity of the urethra adjacent to the rectal tissue than in the vicinity of the urethra distant from the rectal tissue; and driving the antenna with electromagnetic energy at a frequency of about 915 MHz to selectively necrose prostate tissue without necrosing the urethra and the rectal tissue.
Claim 5
Dependent Claim 35 words
The method of claim 2 wherein the step of driving the antenna further comprises heating a volume of prostate tissue encompassing a transition zone of the prostate to a temperature greater than about 45° C.
Claim 6
Independent Claim 124 words
A method of treating a prostate via a urethra, the method comprising: inserting a radiating antenna into the urethra to a level of the prostate, the radiating antenna being electrically connected to an electromagnetic energy generator external to the urethra; positioning the radiating antenna closer to a first side of the urethra distant from a rectal wall than to a second side of the urethra adjacent to the rectal wall; operating the generator to energize the antenna; and circulating a coolant between the radiating antenna and the urethra, wherein the step of circulating comprises circulating a greater volume of the coolant adjacent to the second side of the urethra than the volume of coolant being circulated adjacent to the first side of the urethra.
Claim 7
Independent Claim 124 words
A method of treating a prostate via a urethra, the method comprising: inserting a radiating antenna into the urethra to a level of the prostate, the radiating antenna being electrically connected to an electromagnetic energy generator external to the urethra; positioning the radiating antenna closer to a first side of the urethra distant from a rectal wall than to a second side of the urethra adjacent to the rectal wall; operating the generator to energize the antenna; and circulating a coolant between the radiating antenna and the urethra, wherein the step of circulating comprises circulating a greater volume of the coolant adjacent to the second side of the urethra than the volume of coolant being circulated adjacent to the first side of the urethra.
Claim 8
Dependent Claim 24 words
The method of claim 4 wherein the step of operating the generator further comprises operating the generator at a frequency of about 915 MHz.
Claim 9
Independent Claim 97 words
A method for treating a prostate via a urethra comprising: inserting into a prostatic portion of the urethra a probe having an active heating region, wherein the prostatic portion of the urethra comprises a first urethral wall adjacent to a rectal wall and a second urethral wall distant from the rectal wall; and heating the prostate with the active heating region for a time sufficient to necrose a select volume of prostate tissue without necrosing the rectal wall, the select volume of prostate tissue being located substantially anterior of a plane defined by the first urethral wall.
Claim 10
Independent Claim 97 words
A method for treating a prostate via a urethra comprising: inserting into a prostatic portion of the urethra a probe having an active heating region, wherein the prostatic portion of the urethra comprises a first urethral wall adjacent to a rectal wall and a second urethral wall distant from the rectal wall; and heating the prostate with the active heating region for a time sufficient to necrose a select volume of prostate tissue without necrosing the rectal wall, the select volume of prostate tissue being located substantially anterior of a plane defined by the first urethral wall.

References Cited (Backward Citations)

US3125096A Cited
US2407690A Cited
US3228400A Cited
US3494723A Cited
DE2407559A1 Cited
US3997408A Cited
GB1563795A Cited
US4140130A Cited
US4154246A Cited
US4162500A Cited
SU738596A1 Cited
US4204549A Cited
DE3011322A1 Cited
US4311154A Cited
US4589423A Cited
US4672980A Cited
US4375220A Cited
WO1981003616A1 Cited
US4469103A Cited
US4423725A Cited
US4662383A Cited
EP0105677A1 Cited
US4676258A Cited
US4497324A Cited
US4601296A Cited
US4690156A Cited
US4612940A Cited
WO1986001919A1 Cited
US4800899A Cited
WO1986005990A1 Cited
SU1266548A1 Cited
US4672963A Cited
US4732161A Cited
US4821725A Cited
US4632127A Cited
DE3525702A1 Cited
US4681122A Cited
US4643186A Cited
WO1989002292A1 Cited
US4776086A Cited
US5057106A Cited
US4700716A Cited
US4823812A Cited
EP0248758A1 Cited
US4813429A Cited
EP0246176A2 Cited
US4709698A Cited
EP0253677A1 Cited
DE3725691A1 Cited
DE3730494A1 Cited
US4993430A Cited
US5003991A Cited
US4832023A Cited
US4825880A Cited
US4856528A Cited
US4808164A Cited
US5106360A Cited
EP0311295A2 Cited
US4841988A Cited
US5097845A Cited
US4841988B1 Cited
SU1512622A1 Cited
WO1989005609A1 Cited
US5061267A Cited
WO1989007909A1 Cited
EP0335022A1 Cited
US4907589A Cited
US4924863A Cited
EP0341988A1 Cited
US4869259A Cited
WO1989011311A1 Cited
US4998933A Cited
US4865047A Cited
US4967765A Cited
US5249585A Cited
US5220927A Cited
US5151100A Cited
US4955377A Cited
US5056531A Cited
US5026959A Cited
US5234004A Cited
WO1991013650A1 Cited
EP0370890A1 Cited
EP0459535A2 Cited
WO1990013333A1 Cited
US5037395A Cited
US5007437A Cited
US5045056A Cited
WO1991011975A1 Cited
EP0449472A1 Cited
WO1991015174A1 Cited
WO1991015154A1 Cited
WO1992001142A1 Cited
US5496271A Cited
US5304214A Cited
WO1994004220A1 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 2001-05-25 2001-11-24 2002-05-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2005-05-25 2005-11-24 2006-05-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2009-05-25 2009-11-24 2010-05-26 $7700.00 Window Closed / Lapsed

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