Medical support and fixation device

Abstract

To provide a medical support fixing device capable of selectively setting one of a plurality of predetermined tilt angles and / or yaw angles without arbitrarily setting the tilt angle and / or yaw angle for support-fixing a predetermined part of a human body and also capable of enabling inexpensive manufacturing with a comparatively simple configuration.SOLUTION: A medical support fixing device includes: a base; a support fixing tool for support-fixing a predetermined part of a human body; and at least one tilt angle setting member to selectively intervene between a front part of the base and a front part of the support fixing tool. The tilt angle setting member includes: a bottom wall part extending in a width direction; and support wall parts each of which is projected upward from the bottom wall part and has an upper surface to be inclined upward in a forward direction with respect to a lower surface of the bottom wall.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a medical support and fixation device used for supporting and fixing a predetermined part of the human body, for example, the head, and more specifically, to a medical support and fixation device composed of a base having a flat surface, a support and fixation tool for supporting and fixing a predetermined part of the human body, and a tilt angle setting member interposed between the front part of the base.

Background Art

[0002] The following Patent Document 1 discloses a medical support and fixation device including a base, a yaw angle fine adjustment plate rotatably mounted on the base about a rotation center axis extending perpendicularly to the base, a tilt angle fine adjustment plate rotatably mounted on the yaw angle fine adjustment plate about a turning center axis extending in the width direction of the yaw angle fine adjustment plate, a yaw angle fine adjustment mechanism interposed between the base and the yaw angle fine adjustment plate, and a tilt angle fine adjustment mechanism interposed between the yaw angle fine adjustment plate and the tilt angle fine adjustment plate.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The above-mentioned medical support and fixation device disclosed in Patent Document 1 previously proposed by the present inventor is a useful medical support and fixation device capable of arbitrarily adjusting the yaw angle and the tilt angle. However, the mounting style of the yaw angle fine adjustment plate with respect to the base and the mounting style of the tilt angle fine adjustment plate with respect to the yaw angle fine adjustment plate are relatively complicated, and also the configurations of the yaw angle fine adjustment mechanism and the tilt angle fine adjustment mechanism are relatively complicated, and the manufacturing cost is relatively high.

[0005] On the other hand, in the medical field, there is a demand for medical support and fixation devices that can selectively set the tilt angle to multiple (e.g., three) specific tilt angles rather than arbitrarily, and / or the yaw angle to multiple (e.g., three) specific yaw angles rather than arbitrarily. To elaborate further, for example, when irradiating a tumor that has developed in the brain with radiation such as X-rays to destroy the tumor, it is important to irradiate the tumor from multiple directions so that the tumor is irradiated with the required intensity of radiation, but normal cells through which the radiation passes before reaching the tumor are affected by only weak radiation. In such cases, if the head is supported and fixed at a specific tilt angle and / or yaw angle, and radiation is directed towards the tumor from multiple directions, then the head is supported and fixed at a different tilt angle and / or yaw angle and radiation is directed towards the tumor again from multiple directions, and if necessary the head is supported and fixed at a different tilt angle and / or yaw angle and radiation is directed towards the tumor again from multiple directions, the path of the radiation reaching the tumor is changed each time the tilt angle and / or yaw angle supporting and fixing the head is changed. Therefore, the amount of radiation delivered to normal cells through which the radiation passes can be made extremely weak relative to the total amount of radiation delivered to the tumor.

[0006] The present invention has been made in view of the above facts, and its main technical objective is to provide a novel and improved medical support and fixation device that can selectively set the tilt angle and / or yaw angle for supporting and fixing a predetermined part of the human body to one of a plurality of predetermined tilt angles and / or yaw angles, rather than arbitrarily, and that has a relatively simple structure and can be manufactured at low cost. [Means for solving the problem]

[0007] According to one aspect of the present invention, as a medical support and fixation device that achieves the above-mentioned main technical problem, A base, a support and fixing device for supporting and fixing a predetermined part of the human body, and at least one selectively interposed between the front part of the base and the front part of the support and fixing device. 2 It consists of individual tilt angle setting members. The tilt angle setting member has a bottom wall portion extending in the width direction and a portion that protrudes upward from the bottom wall portion and the bottom wall Lower part against Direction to tilt Includes a support wall portion having an upper surface that slopes upward toward the fruit, The length of the tilt angle setting member that protrudes above the support wall and the inclination angle of the upper surface of the support wall differ for each tilt angle setting member. The tilt angle of the support fixture is changed by changing the tilt angle setting member interposed between the front part of the base and the front part of the support fixture. , A medical support and fixation device is provided, characterized by the following.

[0008] Preferably 、 The tilt angle setting member preferably includes two support walls spaced apart in the width direction. Preferably, a screw hole is formed in the front part of the base, and a through hole is formed in the bottom wall of the tilt angle setting member, and the tilt angle setting member is fixed to the base by screwing a fastening screw through the through hole into the screw hole. A recess is formed in the front part of the lower surface of the support fixture, which extends in the width direction and has a flat bottom surface, and the tilt angle setting member The supporting wall part It is preferable that the support fixing device is positioned relative to the tilt angle setting member by inserting the upper end of the support fixing device into the recess. The front part of the base has at least two pairs of pin insertion holes arranged at intervals in the width direction, and the straight line connecting one pair of the two pairs of pin insertion holes intersects at a predetermined angle with the straight line connecting the other pair of the two pairs of pin insertion holes, and a pair of pin receiving holes is formed on the lower surface of the bottom wall of the tilt angle setting member, and a pin is inserted into one pair of the two pairs of pin insertion holes, and the tilt angle setting member The pair of pin receiving holes When the pin is inserted, the support fixture is positioned with respect to the base at a first yaw angle, and the pin is inserted into the other pair of pin insertion holes of the two pairs of pin insertion holes, and the tilt angle setting member The pair of pin receiving holesWhen the pin is inserted, it is preferable that the support fixture is positioned with respect to the base at a second yaw angle. Three pairs of pin insertion holes are formed in the front part of the base, spaced apart in the width direction. Preferably, the line connecting the first pair of pin insertion holes is perpendicular to the longitudinal center line of the base, the line connecting the second pair of pin insertion holes is inclined clockwise at an angle α with respect to the line connecting the first pair of pin insertion holes, and the line connecting the third pair of pin insertion holes is inclined counterclockwise at an angle α with respect to the line connecting the first pair of pin insertion holes.

[0009] According to another aspect of the present invention, as a medical support and fixation device that achieves the above-mentioned main technical problem, It consists of a base, a support and fixing device for supporting and fixing a predetermined part of the human body, and at least one tilt angle setting member interposed between the front part of the base and the front part of the support and fixing device. The tilt angle setting member has a bottom wall portion extending in the width direction and a portion that protrudes upward from the bottom wall portion and the bottom wall Lower part against Direction to tilt It includes a support wall portion having an upper surface that slopes upward toward the At least two pairs of pin insertion holes are formed in the front of the base, spaced apart in the width direction, and the straight line connecting one pair of pin insertion holes and the straight line connecting the other pair of pin insertion holes intersect at a predetermined angle. A pair of pin receiving holes is formed on the lower surface of the bottom wall portion of the tilt angle setting member. Insert a pin into one of the two pairs of pin insertion holes, and the tilt angle setting member The pair of pin receiving holes When the pin is inserted, the support fixture is positioned with respect to the base at a first yaw angle, and the pin is inserted into the other pair of pin insertion holes of the two pairs of pin insertion holes, and the tilt angle setting member The pair of pin receiving holes When the pin is inserted, the support fixture is positioned with respect to the base at a second yaw angle. A medical support and fixation device is provided, characterized by the following.

[0010] Preferably, three pairs of pin insertion holes are formed at intervals in the width direction at the front part of the base, and a straight line connecting the first pair of pin insertion holes among the three pairs of pin insertion holes is orthogonal to the longitudinal center line of the base. A straight line connecting the second pair of pin insertion holes among the three pairs of pin insertion holes is inclined at an angle α in the clockwise direction with respect to the straight line connecting the first pair of pin insertion holes. A straight line connecting the third pair of pin insertion holes among the three pairs of pin insertion holes is inclined at an angle α in the counterclockwise direction with respect to the straight line connecting the first pair of pin insertion holes.

Advantages of the Invention

[0011] The medical support fixing device of the present invention can selectively set the tilt angle and / or yaw angle for supporting and fixing a predetermined part of the human body to any one of a plurality of predetermined tilt angles and / or yaw angles instead of arbitrarily, and has a relatively simple structure and can be manufactured at low cost.

Brief Description of the Drawings

[0012] [Figure 1] An inclined view showing a base in a preferred embodiment of a medical support fixing device configured according to the present invention. [Figure 2] A plan view of the base shown in FIG. 1. <0000?84> [Figure 3] An inclined view showing a support fixture in a preferred embodiment of a medical support fixing device configured according to the present invention. [Figure 4] An inclined view showing three tilt angle setting members in a preferred embodiment of a medical support fixing device configured according to the present invention. [Figure 5] An inclined view showing a state in which a specific tilt angle setting member is disposed on a base in a preferred embodiment of a medical support fixing device configured according to the present invention. [Figure 6] An inclined view showing a state in which a specific tilt angle setting member is interposed between a base and a support fixture in a preferred embodiment of a medical support fixing device configured according to the present invention. [Figure 7]In a preferred embodiment of a medical support and fixation device configured according to the present invention, a schematic side view showing a state in which each of three tilt angle setting devices is selectively interposed between a base and a support and fixation tool. [Figure 8] In a preferred embodiment of a medical support and fixation device configured according to the present invention, a plan view showing a mode of changing the yaw angle by changing the arrangement state of a tilt angle setting member with respect to a base. [Figure 9] In a preferred embodiment of a medical support and fixation device configured according to the present invention, a schematic diagram for explaining that the radiation irradiation path is changed by changing the tilt angle of the support and fixation tool. [Figure 10] In a preferred embodiment of a medical support and fixation device configured according to the present invention, a schematic diagram for explaining that the radiation irradiation path is changed by changing the yaw angle of the support and fixation tool.

Embodiments for Carrying out the Invention

[0013] Hereinafter, a preferred embodiment of a medical support and fixation device configured according to the present invention will be described in more detail with reference to the accompanying drawings.

[0014] A medical support and fixation device configured according to the present invention includes, together with a base 2 shown in FIGS. 1 and 2 and a support and fixation tool 4 shown in FIG. 3, at least 2 several (in the illustrated case, three) tilt angle setting members 6A, 6B, and 6C shown in FIG. 4.

[0015] Referring to Figures 1 and 2, the illustrated base 2 is formed from a rectangular flat plate that can be made from a suitable synthetic resin. A groove 8 is formed on the front lower surface of the base 2, extending continuously from one edge to the other. The cross-section of the groove 8 is rectangular, and the bottom surface is flat. In addition, a pair of through holes 10 are formed on the front of the base 2 at intervals in the width direction. The through holes 10 are located in the region where the groove 8 is formed, and the through holes 10 open to the bottom surface of the groove 8. The groove 8 and through holes 10 provided on the base 2 are used to position the base on the bed of the radiation irradiation machine (not shown). Furthermore, the base 2 is positioned at a predetermined location on the bed by fitting the groove 8 into a projection with a rectangular cross-section that extends in the width direction on the bed, and by fitting the through holes 10 into a pair of pins arranged at intervals in the width direction on the projection.

[0016] It is important that at least two pairs of pin insertion holes are formed on the front upper surface of the base 2, and in the illustrated embodiment, three pairs of pin insertion holes 12A, 12B, and 12C are formed. Each of the pin insertion holes 12A, 12B, and 12C may be a through hole or a blind hole having the same inner diameter. The straight line 14A connecting the first pair of pin insertion holes 12A is perpendicular to the longitudinal axis 15 of the base 2, the straight line 14B connecting the second pair of pin insertion holes 12B is inclined clockwise at an angle α with respect to the above straight line 14A, and the straight line 14C connecting the third pair of pin insertion holes 12C is inclined counterclockwise at an angle α. In the illustrated embodiment, the angle α is 5 degrees. A pair of pins 16 are selectively inserted into any of the three pairs of pin insertion holes 12A, 12B, and 12C, as will be further described later. In Figure 1, pins 16 are inserted into the first pair of pin insertion holes 12A. Each pin 16 has a lower part with an outer diameter corresponding to the inner diameter of the pin insertion holes 12A, 12B, and 12C, and an upper part with an outer diameter larger than the inner diameter of the pin insertion holes 12A, 12B, and 12C. The lower part of each pin 16 is inserted into one of the three pairs of pin insertion holes 12A, 12B, and 12C, and the upper part of the pin 16 protrudes upward from the surface of the base 2. In the illustrated embodiment, three screw holes 18A, 18B, and 18C are further formed in the widthwise center of the front part of the base 2, spaced apart in the widthwise direction.

[0017] Continuing the explanation with reference to Figure 3, the illustrated support and fixing device 4 includes a main body 20 which is a rectangular flat plate. A groove 22 is formed on the front back surface of the main body 20, which can be formed from a suitable synthetic resin, extending continuously from one side edge to the other. The cross-sectional shape of the groove 22 is rectangular, and the bottom surface is flat. A pair of through holes 24 are formed on the front of the main body 20, spaced apart in the width direction. These through holes 24 are located in the area where the groove 22 is formed, and the through holes 24 open to the bottom surface of the groove 22. A head support piece 26 on which a human head is placed is fixed to the center of the upper surface of the main body 20, and mechanisms 28A, 28B, and 28C for attaching fixing means (not shown) for fixing the head positioned on the head support piece 26 are provided on both sides and the front of the head support piece 26. Such a support and fixing device 4 is a well-known form and does not constitute a novel feature of the medical support and fixing device constructed according to the present invention; therefore, a detailed description of the support and fixing device 4 itself is omitted in the specification.

[0018] Continuing the explanation with reference to Figure 4, the medical support and fixation device configured according to the present invention is at least 2It is important that the device includes tilt angle setting members, in the illustrated case, three tilt angle setting members 6A, 6B, and 6C. Each of the three tilt angle setting members 6A, 6B, and 6C has a bottom wall portion 30A, 30B, and 30C that extends horizontally in the width direction, and support wall portions 32A, 32B, and 32C that project upward from the upper surfaces of both ends of the bottom wall portions 30A, 30B, and 30C. Each of the support wall portions 32A, 32B, and 32C is connected to the upper surface of each of the bottom wall portions 30A, 30B, and 30C by an appropriate connecting means such as an adhesive. If desired, each of the bottom wall portions 30A, 30B, and 30C and each of the two support wall portions 32A, 32B, and 32C can also be formed integrally. Through holes 34A, 34B, and 34C are formed in the widthwise center of each of the bottom wall portions 30A, 30B, and 30C. Two pin receiving holes 36A, 36B, and 36C are formed on the lower surface of each of the bottom wall portions 30A, 30B, and 30C, spaced apart in the widthwise direction. The pin receiving holes 36A, 36B, and 36C may be blind holes. In the illustrated embodiment, reinforcing pieces 38B and 38C are further fixed between the two support wall portions 32B and 32C of each of the tilt angle setting members 6B and 6C by screwing fastening screws 40B and 40C into the reinforcing pieces through the support wall portions 32B and 32C. The bottom wall portions 30A, 30B, and 30C, the support wall portions 32A, 32B, and 32C, and the reinforcing pieces 38B and 38C can be formed from appropriate synthetic resins.

[0019] The upward protrusion lengths of the support wall portion 32A of the tilt angle setting member 6A, the support wall portion 32B of the tilt angle setting member 6B, and the support wall portion 32C of the tilt angle setting member 6C are all different. The protrusion length of the support wall portion 32A is relatively small, the protrusion length of the support wall portion 32B is intermediate, and the protrusion length of the support wall portion 32C is relatively large. Furthermore, the upper surfaces of the support wall portions 32A, 32B, and 32C are inclined upward toward the front, but the inclination angles are all different. The inclination angle βA of the upper surface of the support wall portion 32A is relatively small, 5 degrees relative to the horizontally extending bottom wall portion 30A in the illustrated embodiment; the inclination angle βB of the support wall portion 32B is intermediate, 10 degrees relative to the horizontally extending bottom wall portion 30B in the illustrated embodiment; and the inclination angle βC of the upper surface of the support wall portion 32C is relatively large, 15 degrees relative to the horizontally extending bottom wall portion 30C in the illustrated embodiment (see also Figure 7). Pins 42A, 42B, and 42C, which protrude upward, are connected to the upper surfaces of the respective support wall portions 30A, 30B, and 30C by appropriate connecting means such as adhesive.

[0020] In the illustrated embodiment, two support walls 32A, 32B, and 32C are provided on each of the bottom walls 30A, 30B, and 30C. However, if desired, one support wall 30A, 30B, and 30C with a relatively large width dimension can be provided on the widthwise center of each of the bottom walls 30A, 30B, and 30C, or three or more support walls can be provided on each of the bottom walls 30A, 30B, and 30C at intervals in the widthwise direction.

[0021] Next, the usage method of the medical support and fixing device described above will be explained. When irradiating the head of a human body with radiation, the base 2 is placed at a predetermined position on the horizontally extending bed surface of the radiation irradiation machine (not shown). Then, for example, when setting the tilt angle to 15 degrees and the yaw angle to 0 degrees, the pins 16 are inserted into a pair of pin insertion holes 12A formed on the upper surface of the base 2. Then, as shown in Figure 5, the tilt angle setting member 6C is placed on the base 2. At this time, the pins 16 are inserted into two pin receiving holes 36C formed on the lower surface of the bottom wall portion 30C of the tilt angle setting member 6C, and the tilt angle setting member 6C is positioned on the base 2 as required. Next, the fastening screw 44 is screwed through the through hole 34C formed in the bottom wall portion 30C of the tilt angle setting member 6C into the central screw 18A of the three screw holes 18A, 18B, and 18C formed in the base 2, thereby fixing the tilt angle setting member 6C to the base 2. Subsequently, the support fixture 4 is mounted by interposing the tilt angle setting member 6C between the base 2 and the support fixture 4. At this time, as shown in Figure 6, the upper end of the support wall portion 32C of the tilt angle setting member 6C is engaged with the groove 22 formed on the lower front surface of the support fixture 4, and the pin 42C fixed to the support wall portion 32C of the tilt angle setting member 6C is inserted through the through hole 24 formed on the front of the support fixture 4. Thus, as shown in Figure 6, the support fixture 4 is mounted on the base 2 with a tilt angle of 15 degrees and a yaw angle of 0 degrees. The head 46 of the patient to be irradiated is positioned on the support fixture 4 as shown by the dashed line in Figure 6, and is fixed to the support fixture 4 by fixing means (not shown).

[0022] Continuing the explanation with reference to Figure 7 along with Figures 5 and 6, when setting the tilt angle to 5 degrees, the tilt angle setting member 6A is placed on the base 2, and the support fixing member 4 is attached with the tilt angle setting member 6A interposed between the base 2 and the support fixing member 4. When setting the tilt angle to 10 degrees, the tilt angle setting member 6B is placed on the base 2, and the support fixing member 4 is attached with the tilt angle setting member 6B interposed between the base 2 and the support fixing member 4. The mounting methods of the tilt angle setting members 6C and 6B to the base 2 and the mounting methods of the support fixing member 4 to the tilt angle setting members 6C and 6B are substantially the same as the mounting methods of the tilt angle setting member 6A to the base 2 and the mounting methods of the support fixing member 4 to the tilt angle setting member 6A as described above. If the support fixing member 4 is attached directly to the base 2 without interposing any of the tilt angle setting members 6A, 6B, or 6C, the tilt angle will be 0 degrees.

[0023] Next, the selective setting of the yaw angle will be explained mainly with reference to Figure 8 along with Figure 2. As described above, when the pins 16 are inserted into the pair of pin insertion holes 12A formed on the upper surface of the base 2, and the pins 16 are inserted into the blind holes 36A, 36B, or 36C formed on the lower surface of the bottom wall portions 30A, 30B, or 30C of the tilt angle setting members 6A, 6B, or 6C, and the tilt angle setting members 6A, 6B, or 6C are mounted on the base 2, the yaw angle of the tilt angle setting members 6A, 6B, or 6C (and the support fixing device 4) with respect to the base 2 is 0 degrees. To set the yaw angle of the tilt angle setting members 6A, 6B, or 6C (and support fixing device 4) relative to the base 2 to +5 degrees, that is, to a state where they are tilted 5 degrees clockwise with respect to the longitudinal central axis 16 of the base 2, the pins 16 are inserted into a pair of pin insertion holes 12B formed on the upper surface of the base 2, and the pins 16 are inserted into pin receiving holes 36A, 36B, or 36C formed on the lower surface of the bottom wall portions 30A, 30B, or 30C of the tilt angle setting members 6A, 6B, or 6C, thereby mounting the tilt angle setting members 6A, 6B, or 6C onto the base 2. In this case, the fastening screws 44 are screwed into the screw holes 18B formed in the base 2 through the through holes 34A, 34B, or 34C formed in the bottom wall portions 30A, 30B, or 30C of the tilt angle setting members 6A, 6B, or 6C. To set the yaw angle of the tilt angle setting members 6A, 6B, or 6C (and support fixing device 4) relative to the base 2 to -5 degrees, that is, to a state where they are tilted 5 degrees counterclockwise with respect to the longitudinal central axis 16 of the base 2, the pins 16 are inserted into a pair of pin insertion holes 12C formed on the upper surface of the base 2, and the pins 16 are inserted into pin receiving holes 36A, 36B, or 36C formed on the lower surface of the bottom wall portions 30A, 30B, or 30C of the tilt angle setting members 6A, 6B, or 6C, thereby mounting the tilt angle setting members 6A, 6B, or 6C onto the base 2. In this case, the fastening screws 44 are screwed into the screw holes 18C formed in the base 2 through the through holes 34A, 34B, or 34C formed in the bottom wall portions 30A, 30B, or 30C of the tilt angle setting members 6A, 6B, or 6C.

[0024] According to a linear accelerator, a representative example of a radiation therapy device, radiation is projected onto a single brain tumor 48 in the patient's head 46 through multiple irradiation paths spaced at equal angles in the circumferential direction. Figure 9 illustrates eight circumferentially spaced radiation paths when the tilt angles are 0, 5, 10, and 15 degrees. Referring to Figure 9, it is clearly understood that by successively changing the tilt angle to 0, 5, 10, and 15 degrees and irradiating a single brain tumor 48, radiation is irradiated onto the single brain tumor 48 through 32 (4 × 8) radiation paths, and the amount of radiation passing through normal cells can be made minute relative to the radiation dose to the single brain tumor 48. Figure 10 illustrates eight circumferentially spaced radiation paths when the yaw angles are 0 and +5 degrees. Referring to Figure 10, it is clearly understood that by changing the yaw angle to two values, 0 degrees and +5 degrees, and irradiating one brain tumor 48, the radiation is delivered to the single brain tumor 48 through 16 (2 × 8) radiation pathways, and the amount of radiation passing through normal cells can be made minute compared to the radiation dose to a single brain tumor 48.

[0025] Although preferred embodiments of a medical support and fixing device configured according to the present invention have been described in detail above, the present invention is not limited to these embodiments, and it goes without saying that various modifications and variations are possible without departing from the scope of the present invention. For example, in the illustrated embodiment, multiple tilt angles can be selectively set, and multiple yaw angles can be selectively set, but if desired, a configuration in which multiple tilt angles can be selectively set but the yaw angle is single can be provided (for example, a configuration in which a pair of pin insertion holes 12A are formed in the base 2, but pin insertion holes 12B and 12C are not formed). of Medical support and fixation devices are also available. [Explanation of Symbols]

[0026] 2: Base 4: Support fixture 6A, 6B, and 6C: Tilt angle setting members 12A, 12B, and 12C: Pin insertion holes 16: Pin 18A, 18B, and 18C: Screw holes 20: Main body of the support and fixing device 30A, 30B, and 30C: Bottom wall portion of the tilt angle setting member 32A, 32B, and 32C: Support wall portion of the tilt angle setting member 34A, 34B, and 34C: Through holes 36A, 36B, and 36C: Pin receiving holes 44: Fastening screws

Claims

1. It consists of a base, a support and fixing device for supporting and fixing a predetermined part of the human body, and at least two tilt angle setting members selectively interposed between the front of the base and the front of the support and fixing device. The tilt angle setting member includes a bottom wall portion extending in the width direction and a support wall portion having an upper surface that protrudes upward from the bottom wall portion and is inclined upward with respect to the lower surface of the bottom wall portion in the direction to be tilted. The length of the tilt angle setting member that protrudes above the support wall and the inclination angle of the upper surface of the support wall differ for each tilt angle setting member. The tilt angle of the support fixture is changed by changing the tilt angle setting member interposed between the front part of the base and the front part of the support fixture. A medical support and fixation device characterized by the following features.

2. The medical support and fixing device according to claim 1, wherein the tilt angle setting member includes two support wall portions arranged at intervals in the width direction.

3. A screw hole is formed in the front part of the base, and a through hole is formed in the bottom wall part of the tilt angle setting member, and the tilt angle setting member is fixed to the base by screwing a fastening screw into the screw hole through the through hole. A medical support and fixation device according to claim 1.

4. The medical support and fixing device according to claim 1, wherein a recess extending in the width direction and having a flat bottom surface is formed in the front part of the lower surface of the support and fixing device, and the support and fixing device is positioned relative to the tilt angle setting member by inserting the upper end of the support wall portion of the tilt angle setting member into the recess.

5. At least two pairs of pin insertion holes are formed in the front part of the base, spaced apart in the width direction, and the straight line connecting one pair of pin insertion holes of the two pairs of pin insertion holes intersects at a predetermined angle with the straight line connecting the other pair of pin insertion holes of the two pairs of pin insertion holes, A pair of pin receiving holes is formed on the lower surface of the bottom wall portion of the tilt angle setting member. When a pin is inserted into one pair of the two pairs of pin insertion holes, and then into the pair of pin receiving holes of the tilt angle setting member, the support fixture is positioned relative to the base at a first yaw angle; when a pin is inserted into the other pair of the two pairs of pin insertion holes, and then into the pair of pin receiving holes of the tilt angle setting member, the support fixture is positioned relative to the base at a second yaw angle. A medical support and fixation device according to claim 1.

6. The front part of the base has three pairs of pin insertion holes arranged at intervals in the width direction, The medical support and fixing device according to claim 5, wherein the line connecting the first pair of pin insertion holes among the three pairs of pin insertion holes is perpendicular to the longitudinal center line of the base, the line connecting the second pair of pin insertion holes among the three pairs of pin insertion holes is inclined at an angle α clockwise with respect to the line connecting the first pair of pin insertion holes, and the line connecting the third pair of pin insertion holes among the three pairs of pin insertion holes is inclined at an angle α counterclockwise with respect to the line connecting the first pair of pin insertion holes.

7. The device comprises a base, a support and fixing device for supporting and fixing a predetermined part of the human body, and at least one tilt angle setting member interposed between the front part of the base and the front part of the support and fixing device. The tilt angle setting member includes a bottom wall portion extending in the width direction and a support wall portion having an upper surface that protrudes upward from the bottom wall portion and is inclined upward with respect to the lower surface of the bottom wall portion in the direction to be tilted. At least two pairs of pin insertion holes are formed in the front of the base, spaced apart in the width direction, and the straight line connecting one pair of pin insertion holes and the straight line connecting the other pair of pin insertion holes intersect at a predetermined angle. A pair of pin receiving holes is formed on the lower surface of the bottom wall portion of the tilt angle setting member. When a pin is inserted into one pair of the two pairs of pin insertion holes, and then into the pair of pin receiving holes of the tilt angle setting member, the support fixture is positioned relative to the base at a first yaw angle; when a pin is inserted into the other pair of the two pairs of pin insertion holes, and then into the pair of pin receiving holes of the tilt angle setting member, the support fixture is positioned relative to the base at a second yaw angle. A medical support and fixation device characterized by the following features.

8. The medical support and fixing device according to claim 7, wherein three pairs of pin insertion holes are formed in the front part of the base, spaced apart in the width direction, the straight line connecting the first pair of pin insertion holes is perpendicular to the longitudinal center line of the base, the straight line connecting the second pair of pin insertion holes is inclined at an angle α clockwise with respect to the straight line connecting the first pair of pin insertion holes, and the straight line connecting the third pair of pin insertion holes is inclined at an angle α counterclockwise with respect to the straight line connecting the first pair of pin insertion holes.

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