Source: http://www.google.com/patents/US7025763?ie=ISO-8859-1&dq=7,069,055
Timestamp: 2015-02-27 22:30:31
Document Index: 343618593

Matched Legal Cases: ['art 17', 'art 16', 'art 16', 'art 21', 'art 21', 'art 21', 'art 21', 'art 16', 'art 21', 'art 21', 'art 21', 'art 21', 'art 16', 'art 21', 'art 21', 'art 21', 'art 115', 'art 115', 'art 115', 'art 115', 'art 115', 'art 115', 'art 115', 'art 115']

Patent US7025763 - Medical apparatus - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsThe medical apparatus of this invention includes a therapeutic section at least having a blade for treating a living tissue thermally, a heat insulating part for insulating heat conduction from the blade to the main body of the medical apparatus. The therapeutic section and the heat insulating part are...http://www.google.com/patents/US7025763?utm_source=gb-gplus-sharePatent US7025763 - Medical apparatusAdvanced Patent SearchPublication numberUS7025763 B2Publication typeGrantApplication numberUS 10/397,981Publication dateApr 11, 2006Filing dateMar 26, 2003Priority dateMar 26, 2002Fee statusPaidAlso published asUS20030187429Publication number10397981, 397981, US 7025763 B2, US 7025763B2, US-B2-7025763, US7025763 B2, US7025763B2InventorsHitoshi Karasawa, Chie YachiOriginal AssigneeOlympus CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (14), Referenced by (4), Classifications (10), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetMedical apparatus
US 7025763 B2Abstract
On the other hand, since the blade has a large thermal capacity, a large amount of heat can be utilized for a thermal treatment of a living tissue by restraining thermal conduct from the blade to the grasping section and the main body of the medical apparatus. To fully utilize the large heat stored in the blade effectively, in the invention, a heat insulating part (for example, the material of the insulating part contains as its essential material fluororesin, silicone rubber, ceramics, glass, wood, pottery, asbestos, rubber or Teflon� and others) is interposed between the therapeutic part (a part having a blade for performing thermal treatment) and another member.
FIG. 10C is a cross-sectional view taken along line 10C�10C of FIG. 10A;
FIG. 11 is a cross-sectional view taken along line 11�11 of FIG. 10A;
FIG. 14B is cross-sectional view taken along line 14B�14B of FIG. 14A;
FIG. 15B is a cross-sectional view taken along line 15B�15B of FIG. 15A.
FIG. 2A is a cross-sectional view showing a distal tip portion of the therapeutic instrument 2. FIG. 2B is a cross-sectional view taken along line 2B�2B of FIG. 2A. FIG. 3A is a cross-sectional view taken along line 3A�3A of FIG. 2A.
FIG. 3B is a cross-sectional view taken along line 3B�3B of FIG. 2A. FIG. 3C is a cross-sectional view taken along line 3C�3C of FIG. 2A.
The heat insulating part 17 includes a rigid, heat insulating frame 18 having an approximately U-like cross-sectional shape as shown in FIGS. 3A to 3C. This heat insulating frame 18 is made of a material which does not easily conduct heat, such as fluororesin, silicone rubber or ceramics. Other materials, such as glass, wood, pottery, asbestos, rubber and polytetrafluoroethylene (Teflon�) which are lower in thermal conductivity than the therapeutic part 16 and the grasping sections (jaws) 7 and 8 can also be used for the heat insulating frame 18. The heat insulating frame 18 has a function as a holding frame 19 which holds the therapeutic part (blade) 16.
In addition, supporting pins 29 a and 29 b for the heat conducting plate 20 are respectively secured to the opposite front and rear ends of the holding frame 19. A first inserting hole 30 in which the supporting pin 29 a disposed on the front side of the holding frame 19 is inserted is formed in the front end portion of the heat conducting plate 20. A second inserting hole 31 in which the supporting pin 29 b disposed on the rear side of the holding frame 19 is inserted is formed in the rear end portion of the heat conducting plate 20. The heat conducting plate 20 and the holding frame 19 are supported in the state of being connected to each other by the front and rear supporting pins 29 a and 29 b. As shown in FIG. 4, the second inserting hole 31 of the heat conducting plate 20 is formed by a slot which is long in the longitudinal direction of the heat conducting plate 20. The supporting pin 29 b is loosely fitted for movement back and forth in the second inserting hole 31 in the longitudinal direction of the heat conducting plate 20. In addition, the second inserting hole 31 serves as a slot-shaped thermal expansion absorbing portion which absorbs the difference in thermal expansion between the heat conducting plate 20 and the holding frame 19.
The proximal end of the movable jaw 55 is supported at the distal tip of the outer pipe 56 for rotation about a rotating shaft 58 disposed in a direction perpendicular to the axial direction of the outer pipe 56. As shown in FIG. 7A, an approximately U-like shaped axial supporting portion 59 is formed at the distal tip of the outer pipe 56. Two axial supporting arms 59 a and 59 b are disposed in parallel with each other in the axial supporting portion 59. A rotating shaft 58 is disposed to pass between these axial supporting arms 59 a and 59 b. Furthermore, an elongated extending portion 60 is formed at the proximal end of the movable jaw 55 in such a manner as to be inserted between the two axial supporting arms 59 a and 59 b. As shown in FIG. 7B, the extending portion 60 has a hill-shaped protruding portion 61 protruded downwardly from the rotating shaft 58. The distal tip of the driving shaft 57 is connected to the protruding portion 61 for turning movement about a pivot shaft 62.
In the therapeutic instrument 2 of the fourth embodiment, the heat insulating frame 18 inside the first grasping section 7 uses a material, such as polytetrafluoroethylene (Teflon�), which is low in thermal conductivity and has high non-tackiness for preventing the sticking of a living tissue. The heat conducting plate 20 of the therapeutic part 16 uses a material, such as copper, which is high in thermal conductivity. A coating portion 71 such as Teflon� is formed on at least the edge portion of the blade edge part 21 of the heat conducting plate 20 so that non-tackiness is given to the external surface of the edge portion.
As shown in FIG. 11, the opposite lateral sides of each of the first grasping section 7 and the heat insulating frame 18 have bottom surfaces which are respectively cut as surfaces 73 and 74 extending in obliquely upward directions. The angle a formed between each of the inclined surfaces 74 of the heat insulating frame 18 and the center line of the blade edge part 21 of the heat conducting plate 20 is set to be an angle (obtuse angle) of not smaller than 90�. Similarly, the angle α formed between each of the inclined surfaces 73 of the first grasping section 7 and the center line of the blade edge part 21 of the heat conducting plate 20 is set to be an angle (obtuse angle) of not smaller than 90�. Consequently, as shown in FIG. 12, the amount of exposure of the blade edge part 21 of the heat conducting plate 20 is increased, and a relief portion (contact preventing portion) 75 for preventing a living tissue from coming into contact with the opposite lateral side surfaces of the therapeutic part 16 when the living tissue is grasped between the blade edge part 21 of the first grasping section 7 and the second grasping section 8 is formed by each of the inclined surfaces 73 of the first grasping section 7 and the adjacent one of the inclined surfaces 74 of the heat insulating frame 18.
Furthermore, the angle α formed between each of the inclined surfaces 74 of the heat insulating frame 18 and the center line of the blade edge part 21 of the heat conducting plate 20 is set to be an angle (obtuse angle) of not smaller than 90�. Similarly, the angle α formed between each of the inclined surfaces 73 of the first grasping section 7 and the center line of the blade edge part 21 of the heat conducting plate 20 is set to be an angle (obtuse angle) of not smaller than 90�. In addition, the relief portion 75 is formed. Consequently, when the blade edge part 21 of the first grasping section 7 and the second grasping section 8 are closed, the living tissue H can be prevented from coming into contact with the opposite side surfaces of the therapeutic part 16, owing to the relief portion 75 formed by each of the inclined surfaces 73 of the first grasping section 7 and the adjacent one of the inclined surfaces 74 of the heat insulating frame 18. Consequently, when the living tissue H is grasped between the blade edge part 21 of the first grasping section 7 and the second grasping section 8, pressure for pressing the living tissue H can be concentrated onto the blade edge part 21 of the first grasping section 7, whereby the blade edge part 21 of the first grasping section 7 can be brought into intimate contact with the living tissue H to fully compress the living tissue H. As a result, the living tissue H is coagulated with strong force, and further, the living tissue H can be incised by using heat at the same time as the coagulation of the living tissue H.
Two grooves 114 for providing heat insulating air layers are disposed to extend along the axial direction of the first grasping section 94 at the inside bottom of the first grasping section 94. A coating portion 116 such as Teflon� is formed on at least the edge portion of the blade edge part 115 of the heat conducting plate 112 so that non-tackiness is given to the external surface of the edge portion. Incidentally, the number of the grooves 114 is not limited to two, and the grooves 114 may also include one or three or more grooves constructed to achieve the purpose of insulating or reducing heat to be conducted from the heat insulating frame 111 to the first grasping section 94.
The opposite lateral sides of each of the first grasping section 94 and the heat insulating frame 111 have bottom surfaces which are respectively cut as surfaces 118 and 119 extending in obliquely upward directions. The angle α formed between each of the inclined surfaces 119 of the heat insulating frame 111 and the center line of the blade edge part 115 of the heat conducting plate 112 is set to be an angle (obtuse angle) of not smaller than 90�. Similarly, the angle α formed between each of the inclined surfaces 118 of the first grasping section 94 and the center line of the blade edge part 115 of the heat conducting plate 112 is set to be an angle (obtuse angle) of not smaller than 90�. Accordingly, the amount of exposure of the blade edge part 115 of the heat conducting plate 112 is increased. A relief portion (contact preventing portion) 120 for preventing a living tissue from coming into contact with the opposite lateral side surfaces of the therapeutic part when the living tissue is grasped between the blade edge part 115 of the first grasping section 94 and the second grasping section 95 is formed. The relief portion is formed by each of the inclined surfaces 118 of the first grasping section 94 and the adjacent one of the inclined surfaces 119 of the heat insulating frame 111.
Furthermore, the angle α formed between each of the inclined surfaces 118 of the heat insulating frame 111 and the center line of the blade edge part 115 of the heat conducting plate 112 is set to be an angle (obtuse angle) of not smaller than 90�. Similarly, the angle α formed between each of the inclined surfaces 118 of the first grasping section 94 and the center line of the blade edge part 115 of the heat conducting plate 112 is set to be an angle (obtuse angle) of not smaller than 90�. In addition, the relief portion 120 is formed. Consequently, when the blade edge part 115 of the first grasping section 94 and the second grasping section 95 are closed, the living tissue H can be prevented from coming into contact with the opposite side surfaces of the therapeutic part, owing to the relief portion 120 formed by each of the inclined surfaces 118 of the first grasping section 94 and the adjacent one of the inclined surfaces 119 of the heat insulating frame 111.
As shown in FIG. 15B, a bottom edge portion 136 of the element 135 has a tapered cross-sectional shape. The top flat portion (as viewed in FIG. 15B) of the element 135 is accommodated in the groove-shaped accommodating space 19 a inside the holding frame 19 of the heat insulating frame 18, and is fixed in the state of being surrounded by being covered by the heat insulating frame 18 which is the holding frame 19. Furthermore, the tapered portion of the bottom edge portion 136 of the element 135 is held in the state of being exposed from the holding frame 19, whereby the bottom edge portion 136 can be brought into contact with a living tissue. Incidentally, the entire outer surfaces of the element 135 except the electrodes 133 are covered with a thin coat such as Teflon� so that a living tissue or blood is prevented from sticking to the element 135.
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