A microwave surgical device with high energy efficiency produces, at an antenna, an asymmetric heating pattern directed towards the side and it comprises: a plain curved portion extending from the distal end of said external conductor; and an inflection point at said distal end of the external condu
A microwave surgical device with high energy efficiency produces, at an antenna, an asymmetric heating pattern directed towards the side and it comprises: a plain curved portion extending from the distal end of said external conductor; and an inflection point at said distal end of the external conductor, so that said curved portion has a single cavity directed towards the axis of the coaxial end part.
대표청구항▼
1. A microwave surgical device (1), comprising: a transmission line having a coaxial end part (2) with an internal wire-shaped conductor (4) and an external tubular conductor (5); andan antenna (7) for emitting microwaves connected to a distal end of the internal conductor (4), the antenna (7) compr
1. A microwave surgical device (1), comprising: a transmission line having a coaxial end part (2) with an internal wire-shaped conductor (4) and an external tubular conductor (5); andan antenna (7) for emitting microwaves connected to a distal end of the internal conductor (4), the antenna (7) comprising: an inflection point (8) at said distal end of the external conductor (5); anda curved portion projecting from said inflection point (8) and forming a coil with a coil curvature,so that said coil is asymmetric and forms a single cavity, defined by said coil curvature, directed towards an axis (C) of the coaxial end part (2), so as to determine a feed point, wherein an emitted power assumes a maximum value at a minimum distance between internal and external conductor (4, 5), proximate to said inflection point (8), in an asymmetric position with respect to the axis (C) of the coaxial end part (2), providing a heating pattern (9) with a shape that is asymmetrical with respect to the axis (C) of the coaxial end part (2) and protrudes laterally. 2. The device according to claim 1, wherein a displacement of the feed point determined by the inflection point (8) with respect to an end edge point of the external conductor (5) nearest thereto is equal to or lower than Δ/4, wherein λ is a wavelength of the microwaves emitted by the antenna (7). 3. The device according to claim 1, wherein said curved portion lies wholly on a plane. 4. The device according to claim 1, wherein a length of the coil projecting from the external conductor (5) is substantially equal to λ/4, wherein λ is the wavelength of the microwaves emitted by the antenna (7). 5. The device according to claim 1, wherein the coil of the antenna (7) has a lateral size greater than one of a coaxial end part (2). 6. The device according to claim 1, wherein the coaxial end part (2) is wound on a sheath (3) which, at the curved portion of the antenna (7), is wholly absent so as to leave uncovered even the portion of external tubular conductor (5) adjacent thereto. 7. The device according to claim 1, wherein the coil is bevelled shaped. 8. The device according to claim 1, wherein a sleeve (12) made of rigid material is provided, at the respective distal end of the external tubular conductor (5), to confer stiffness to the end portion of the coaxial end part (2). 9. The device according to claim 1, wherein the coaxial connection wire is inserted in a catheter (106) having a circular section and being longitudinally divided into three portions by means of respective baffles (107) defining three corresponding channels: a first channel (105), wherein said coaxial wire ending with a coaxial end part (2) is housed;a second channel (109); anda third channel (110) for circulating a coolant fluid. 10. The device according to claim 9, wherein temperature sensors (113) for continuously controlling the extracted heat are inserted within the second and third channel (109, 110). 11. The device according to claim 1, wherein the coaxial wire and the respective coaxial end part (2) are housed within a flexible tubular catheter (114) configured as an external sheath, housing a conduit (115) which is connected to a balloon (116) placed at the antenna (7), wherein: a temperature sensor (117) is placed within the balloon (116);the balloon (116) is placed in a position opposed to the curved portion;a cooling liquid (119) configured to be poured-in for inflating the balloon (116) through the conduit (115), the balloon (116) inflation protects and isolates the cavity wall opposed to the one of the operation. 12. The device according to claim 4, wherein the coil forming the antenna (7) is open and the curved portion ends with a metallic sphere (12), an overall length of the antenna (7) being lower than λ/4.
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이 특허에 인용된 특허 (4)
Thome Scott P. (Waite Park MN) Flachman Jonathan L. (Minneapolis MN), Devices for transurethral thermal therapy.
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