JP2007175417A - Living body fixing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To firmly and precisely position a limb by utilizing the intrinsic form of a bone inherent in the limb when it is necessary to securely, precisely and accurately position and fix a region of a living body for the measurement, diagnosis, treatment, surgery, etc. <P>SOLUTION: The living body fixing device 96 is a device for fixing a lower limb (especially the proximal part) as the limb. A peroneal bone head fixing part 120 with a positioning pad 56 and an inner side fixing mechanism 94 with an inner side pad 96 are disposed on both sides of the lower limb respectively. The lower limb can be held between the positioning pad 56 and the inner side pad 96 by advancing the inner pad 96 while the positioning pad 56 is positioned and made to abut to the peroneal bone head of the lower limb via a thin dermal layer. Since such a characteristic bone region as the peroneal bone which can be specified from outside via the thin dermal layer is a reference for positioning, the lower limb can be fixed with excellent reproducibility, and can be securely held. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a living body fixing device, and more particularly, to an apparatus for positioning and fixing living tissues (limbs) such as upper limbs and lower limbs.

  In living body measurement and surgery, it is necessary to position and fix a target region. When measuring the mechanical characteristics of bone in a living body non-invasively and quantitatively using an ultrasonic diagnostic apparatus, it may be desirable to position and fix the bone to be measured. In particular, when ultrasonically diagnosing bone properties and the degree of fusion at a fracture site under a three-point bending load, it is necessary to correctly position the target tissue including the target bone and securely fix the target tissue. In surgery and other cases, accurate positioning and fixing of the target tissue is required. An undiagnosed Japanese Patent Application No. 2004-362455, previously filed by the present applicant, discloses a technique for ultrasonic diagnosis of bone properties and the degree of fusion at a fracture site under a three-point bending load. The following Patent Documents 1 and 2 describe a method for performing bone union diagnosis using ultrasonic waves.

JP 2004-298205 A JP 2005-152079 A

  If the specific part of the target tissue is randomly held when the biological tissue is positioned and fixed, the target tissue cannot be reliably fixed due to the elasticity or flexibility of the soft tissues such as skin and muscle existing around the bone. In addition, with such a rough method, it is difficult to accurately position the target tissue in the first place. On the other hand, it is conceivable to firmly fix the target tissue using a member that wraps the entire target tissue, but in that case, the member becomes an obstacle to surgery or measurement.

  In particular, when a minute displacement is measured using an ultrasonic wave when a load is applied to the target bone, it is necessary to reliably suppress the movement of the target tissue, particularly the movement of the target bone. Moreover, in bone fusion diagnosis, when periodically measuring the degree of fusion of a target bone, it is required to hold the target bone in the same position and posture over a plurality of measurements from the viewpoint of measurement reproducibility. That is, fixed reproducibility is required. Such a problem can be similarly pointed out in other measurement other than ultrasonic measurement of bone or in other fields. Conventionally, an apparatus for positioning and fixing a living tissue while using the target bone itself as a coordinate reference has not been realized.

  An object of the present invention is to provide a living body fixing device capable of accurately positioning and fixing a limb.

  Another object of the present invention is to provide a living body fixing device capable of positioning and fixing a living body with certainty and accuracy by utilizing the inherent form of the limb itself.

  The present invention is a living body fixing device that fixes a limb with reference to a characteristic bone portion that can be identified from outside the body, and is a first contact that is brought into contact with the characteristic bone portion of the limb through a skin layer. A contact portion, a second contact portion that holds the limb with the first contact portion, and an advancing and retreating mechanism that moves the second contact portion relative to the first contact portion. , Including.

  In this configuration, the limb that is the positioning target is held between the first contact portion and the second contact portion, and movement thereof is limited. In particular, the first contact portion can be brought into contact with the characteristic bone portion via the skin layer, so that the portion can be reliably held. Moreover, the site | part on the opposite side can be reliably hold | maintained with a 2nd contact part. As a result, the occurrence of misalignment can be effectively prevented or reduced. According to the above configuration, since the advance / retreat mechanism for moving the second contact surface relative to the first contact surface is provided, the distance between the first contact surface and the second contact surface is adjusted. Thus, the limb is held between the contact surfaces.

  The above-described configuration is desirably used when positioning and fixing of the upper limb or the lower limb, that is, the limb body is necessary when performing measurement, diagnosis, treatment, surgery, or the like of a living body. The living body is preferably a human being, but may be an animal. The characteristic bone portion is desirably a local site of protruding or raised bone. That is, it is desirable to be a protruding or raised bone part that can be recognized by touching or observing the shape of the bone surface existing in the living body from above the skin. In that case, it is desirable that the skin layer existing on the characteristic bone portion is thinner.

  Preferably, the first contact portion has a first contact surface having a small area, and the second contact portion has a second contact surface having a large area. In this configuration, since the first abutting surface has a small area, the first abutting surface can be abutted while accurately positioning the target bone portion as a reference for positioning. Further, since the second contact surface has a larger area than the first contact surface, a portion having no characteristic bone portion that can be recognized from the outside, that is, a relatively soft living body portion that swells widely is tightly wrapped. Can be fixed. When the living body is fixed, the living body may be held in a horizontally lying posture, or the living body may be held upright. In other words, it is desirable to select the arrangement and posture of the limb fixing device so as to have a comfortable posture without causing fatigue on the living body.

  Preferably, the first contact portion is formed of a hard member having the first contact surface, and the second contact portion is formed of a soft member having the second contact surface. To do. That is, the material of the component that forms the second contact surface is configured to be softer than the material of the component that forms the first contact surface.

  Preferably, the second contact surface is configured as a concave curved surface. As described above, it is desirable that the shape of the second contact surface is formed in advance as a curved surface shape so as to be in close contact with the living body.

  Preferably, the limb is a lower limb, and the characteristic bone portion is a site that can be identified from the outside through a thin skin layer with a bulge. If the skin is thin, it is easy to recognize the shape of the bone surface, which is preferable for use as a positioning reference and for firmly holding the living body.

  Preferably, the characteristic bone portion is a radial head. This is a characteristic bone portion at the end of the rib of the lower leg, and is suitable as a positioning reference when holding and fixing the lower leg under the knee.

  The living body fixing device according to the present invention corresponds to a mechanism (proximal fixing mechanism) for positioning and fixing the proximal portion of the limb in an embodiment described later, and also corresponds to a limb fixing device used independently. To do. At the same time, a mechanism (distal fixing device) for positioning and fixing the distal portion of the limb may be provided.

  As described above, according to the present invention, positioning and fixing of limbs can be performed accurately. Alternatively, according to the present invention, the living body can be positioned and fixed with certainty and accuracy using the inherent form of the limb itself.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.

  FIG. 1 shows a perspective view of a preferred embodiment of the biological fixation device according to the present invention. The living body fixing device according to the present embodiment is a device for fixing the lower leg part of a living body. For example, when performing an ultrasonic diagnosis of a bone fusion state after a fracture, the lower leg part is positioned with high accuracy and strong. Used to fix to. Of course, the biological fixation device according to the present invention can be used for purposes other than measurement.

  In FIG. 1, the biological fixation device has a proximal fixation mechanism (proximal fixation device) 100 and a distal fixation mechanism (distal fixation device) 102. The proximal fixing mechanism 100 has a radial head fixing part 20 and a proximal inner fixing part 28 for positioning and fixing the proximal part 10a. The distal fixation mechanism 102 has a movable mechanism 26 that positions and fixes the distal portion 10b. In FIG. 1, an XYZ orthogonal coordinate system is defined. Further, in FIG. 7 to be described later, in order to explain the movement of the distal fixing mechanism, the central axis of the rotation angle θ and the central axis of the inclination angle φ are defined. The living body fixing device of the present embodiment is a device for fixing the lower limbs of the human body as described above, and in particular, fixes the living body using a plurality of characteristic bone portions existing in the lower limbs as a positioning reference. is there. In the following, prior to detailed description of the mechanism, a plurality of characteristic bone portions used as positioning references in the present embodiment will be described.

  FIG. 2 shows a tibia 80 and a rib 82 included in the right lower leg of the human body. At the upper end of the rib 82, there is a rib head 84 protruding outward with a bulge. In addition, at the lower end portion of the rib 82, there is an outer fruit 86 protruding outward like the rib head 84. In addition, an endometrium 88 is present at the lower end of the tibia 80, which is also a local site protruding outward. It should be noted that the radial head 84, the external fruit 86 and the internal fruit 88 are all local sites that can be easily identified visually or in contact with each other through a thin skin layer. If such a local part is used as a positioning reference, the living body can be positioned objectively and accurately, and in particular, the reproducibility of fixation can be made extremely good. The skin layer present on those sites is generally thin without much influence on the physique. If the skin layer is thin, it is possible to reliably press each part without receiving much elasticity and flexibility. Of course, it is possible to use a characteristic bone portion other than the above as a positioning reference. In that case, it is desirable to appropriately select a reference biological part in consideration of the fact that the position can be specified accurately and can be reliably held.

  Returning to FIG. 1, the living body 10 is specifically the right foot of a human body, and the right foot is positioned and fixed in a substantially horizontal state. In addition to the proximal fixing mechanism 100 and the distal fixing mechanism 102, an elastic member (for example, a urethane member) that softly supports the living body 10 may be provided as necessary. However, such a member needs to be installed so as not to affect the three-point bending condition, ultrasonic measurement, and the like. Although the same configuration is shown in FIG. 3, the living body is not shown in FIG.

  Referring to FIG. 3, the configuration will be described based on FIG. 1. A vertical plate 14 is disposed on a horizontal plate 12 as a base. Specifically, the vertical plate 14 is fixed in a standing state on the horizontal plate 12 by a triangular support plate 16. Another substrate 18 is superposed and fixed on the horizontal plate 12. In the present embodiment, a known magnet component is built in the movable mechanism 26 of the distal fixing mechanism 102. The magnet component is capable of switching on and off the magnetic action exerted by it. The movable mechanism 26 is detachably fixedly installed on the substrate 18 using its action. For this reason, a metal plate made of an iron-based material is used as the substrate 18. The horizontal plate 12 and the vertical plate 14 are made of an aluminum material or other members for weight reduction. Two long holes 22 and 23 are formed in the vertical plate 14 at regular intervals in the Y direction (see FIG. 3). Each of the long holes 22 and 23 is a through hole extending in the vertical direction, that is, the Z direction as shown in the figure. As shown in FIG. 1, a radial head fixing portion 20 used to hold a proximal portion (near the patella in the illustrated example) 10 a is selectively attached to one of the long holes 22. In the illustrated example, the radial head fixing portion 20 is attached to the long hole 22 on the back side in the Y direction at an appropriate height. The reason for providing the two long holes 22 and 23 is to selectively correspond to the left and right lower limbs. The reason why the elongated holes 22 and 23 are extended in the vertical direction is to enable adjustment of the height of the radial head fixing portion 20. In order to adjust the height of the radial head fixing part 20, another vertical mechanism may be employed. A pair of handles 12 a and 12 b are provided at both corners of the horizontal plate 12.

  The radial head fixing | fixed part 20 has the positioning pad 56 which contacts a body. The positioning pad 56 is fixed at an appropriate height while the height is adjusted to the height of the radial head, and then the positioning pad 56 is pressed against the radial head through the thin skin layer by the advance movement. By defining the position of the radial head, the spatial position of the proximal portion 10a is almost determined. In other words, the position of the radial head fixing portion 20 is determined with respect to the proximal portion 10a. On the other hand, a proximal inner fixing portion 28 is provided on the opposite side of the radial head fixing portion 20 across the living body. The proximal inner fixing portion 28 has an enlarged inner pad 32, and the inner pad 32 is applied so as to hold the inner surface of the knee with a large area. In this way, the position of the inner pad 32 is adjusted so that the proximal portion 10a is securely held on the opposite side of the radial head. Specifically, the proximal inner fixing portion 28 is fixed to the horizontal plate 12 with screws or bolts. Further, the height of the inner pad 32 can be adjusted by adjusting the installation height in the long hole provided in the scale 40 that forms the base of the proximal inner fixing portion 28. The inner pad 32 is provided so as to be able to advance and retract with respect to the scale 40. As shown in FIG. 3, the horizontal plate 12 is formed with two equal installation parts 30a and 30b. By selectively installing the proximal inner fixing part 28 on the horizontal plate 12, the left and right feet are arranged. It can correspond to.

  As will be described in detail later with reference to FIG. 7 and the like, the movable mechanism 26 constituting the distal fixation mechanism 102 includes an external fruit pad that is brought into contact with the external fruit existing in the distal portion 10b through a thin skin layer. An endometrial pad which is brought into contact with the endometrium present in the distal portion 10b through a thin skin layer. As described above, the movable mechanism 26 incorporates a magnet component capable of switching on and off the magnetic adsorption action. This constitutes the base of the movable mechanism 26. When the movable mechanism 26 is installed in the vicinity of the heel of the lower limb and positioning is performed, in this embodiment, the outer fruit is used as a main reference, and the positioning is performed. Specifically, first, the operation of the function of the magnet component is turned off (released state), and the movable mechanism 26 is translated on the substrate 18 so that the horizontal position of the outer fruit pad is adjusted to the horizontal position of the outer fruit pad. To. In this state, the magnet component is turned on to attract and fix it on the substrate 18. Thus, since the distal fixing portion 26 can be fixedly installed at an arbitrary position on the substrate 18 by the on / off operation of the magnet component, the difference in the length of the individual legs of the measurement subject, That is, it is possible to flexibly cope with variations in the position of the distal portion caused by individual differences.

  As will be described in detail later, after the movable mechanism 26 is fixed, the outer fruit pad is positioned on the outer fruit by adjusting the upper and lower parts of the movable mechanism 26. That is, the external fruit hits the external fruit pad through the skin layer. Next, the inner fruit pad is positioned with respect to the inner fruit, in which case the outer fruit pad (the origin of coordinates set on the outer fruit pad) is used as a reference by an inclination mechanism and a horizontal rotation mechanism described later. As described above, the inclination angle and horizontal rotation angle of the endocarpal pad can be freely adjusted. Furthermore, the inner fruit pad is configured to be movable forward and backward with respect to the outer fruit pad, and the living body can be firmly held between the outer fruit pad and the inner fruit pad by moving the inner fruit pad forward.

  FIG. 4 is an exploded perspective view of the radial head fixing part 20 for fixing the proximal part. In the radial head fixing portion 20, a positioning pad 56 that is brought into contact with the radial head via a skin layer is attached to the fixing metal fitting 54. By turning the knob 48 integrated with one end of the screw shaft 50, the screw portion at the other end of the screw shaft 50 is engaged with the fixing bracket 54. As a result, the interval between the fixing bracket 54 and the fixing bracket 52 is increased. Can be adjusted. Thereby, the long hole 22 on the vertical plate 14 is sandwiched from both sides by the fixing bracket 54 and the fixing bracket 52, and the radial head fixing portion 20 is attached to the vertical plate 14 (FIG. 1). The installation height of the radial head fixing part 20 can be freely adjusted by changing the height of the screw shaft 50 passing through the long hole. The fixing metal 54 is chamfered according to the length of the short axis of the long hole.

  The positioning pad 56 is formed of a member harder than the inner pad included in the proximal inner fixing portion, and the contact surface 57 is smaller than the area of the inner pad. As a result, the positioning pad 56 can be brought into contact with the radial head accurately. An opening or a depression is formed in the central portion 57A of the contact surface 57 so that the center can be easily aligned with the apex of the bulge of the radial head. It is desirable to adopt the same depression structure for the outer fruit pad and inner fruit pad described later.

  FIG. 5 shows an enlarged view of the proximal inner fixing portion 28. FIG. 6 is an exploded perspective view of the proximal inner fixing portion 28. In these drawings, an inner pad 32 in contact with a body surface opposite to the radial head in the proximal portion is attached to a moving plate 34, and a ball bearing 36 is attached to the moving plate 34. A long hole 40A is provided in the scale 40 as a pedestal fixed to the horizontal plate 12 so that the height can be adjusted. The long hole 40A is sandwiched from both sides by a fixing metal 38 and a fixing metal 42. A screw is cut in the through hole of the fixing bracket 38, and the inner pad 32 provided at the other end of the screw shaft 44 is rotated by rotating a lever 46 integrated with one end of the screw shaft 44. Move forward and backward. The inner pad 32 has a contact surface larger than the positioning pad for the radial head, and is made of a member softer than the positioning pad. The inner contact surface 31 of the inner pad 32 has an arcuate shape or a curved shape in accordance with the shape of the living body.

  As described above, the proximal portion of the living body is reliably positioned and fixed by the radial head fixing portion and the proximal inner fixing portion as the proximal fixing portion. In this case, since the radial head is used as a positioning reference, the positioning pad can always be applied at the same position during the ultrasonic examination, and the proximal portion can be reliably secured by the positioning pad and the inner pad on the opposite side. It is possible to maintain the holding state. That is, the reproducibility and sustainability of positioning can be improved. In addition, since the skin layer on the radial head is usually thin regardless of the physique difference, it means that the effect of the elasticity and flexibility of the skin layer is reduced and eliminated, and the radial head can be contacted and held accurately. There are advantages.

  FIG. 7 is a perspective view of the movable mechanism 26 constituting the substance of the distal fixing mechanism. FIG. 8 is an exploded perspective view of the movable mechanism 26. In both figures, in the movable mechanism 26, a magnet base 58 as a magnet component, a flat bottom plate 59, a θ rotation stage portion 60, an upper and lower portion 62, and an inner and outer fruit holding portion 76 as a holding unit are stacked in order from the bottom. Configured. The lowermost magnet base 58 functions as a pedestal installed under the bottom plate 59, whereby the movable mechanism 26 can be installed and fixed at an arbitrary position on the substrate shown in FIG. 1. The θ-rotation stage unit 60 installed on the upper surface of the bottom plate 59 rotates itself to rotate units such as the upper and lower units 62 installed thereon. These units rotate around a straight line parallel to the Z axis. Incidentally, the rotation axis passes through the origin set with reference to the outer fruit pad. The function of the θ rotation stage unit 60 will be described later. The rotation angle in the θ direction can be locked by a lock mechanism.

  It is possible to adjust the height of the inner and outer fruit holding part 76 in the Z direction by the upper and lower parts 62. As shown in FIG. 7, the inner and outer fruit holding unit 76 is equipped with an outer fruit pad 66 and an inner fruit pad 68. By adjusting the height by the upper and lower parts 62, it is possible to adjust the outer fruit pad 66 to the position of the outer fruit existing in the distal part. That is, by adjusting the horizontal position of the movable mechanism 26, adjusting the height of the inner and outer fruit holding portions, and other adjustments, the outer fruit pad 66 can be positioned and brought into contact with the outer fruit as the main positioning reference in the distal portion. Is possible.

  As described above, after the positioning for the outer fruit is completed, the positioning for the inner fruit is performed. Specifically, the θ rotation stage unit 60 is operated to rotate the inner / outer fruit holding unit 76 and change its direction to a desired direction. The rotational axis passes through the center of the surface of the outer fruit pad 66 (strictly speaking, a position slightly within the outer fruit pad 66 from the surface in consideration of slight deformation of the outer fruit pad 66). Even if the inner and outer fruit holding part 76 is rotated, the contact state of the outer fruit pad 66 is maintained. The inner and outer fruit holder 76 is equipped with an inclination mechanism 77 and an advance / retreat mechanism 79. The tilting mechanism 77 tilts a unit composed of the outer fruit pad 66 and the inner fruit pad 68 and the advance / retreat mechanism provided with them. That is, the rotation axis of the inclination is a horizontal axis that passes through the origin. Thereby, even if the unit makes a tilting motion, the contact state of the outer fruit pad 66 can be maintained. The advance / retreat mechanism 79 is a mechanism for moving the inner fruit pad 68 forward and backward with respect to the outer fruit pad 66. Even in such a case, the inner fruit pad 68 can be moved while the outer fruit pad 66 is fixed, so that the contact state of the outer fruit pad 66 can be maintained. In this way, with the outer fruit as the main positioning reference, the outer fruit pad is brought into contact with the outer fruit and positioned, and the horizontal rotation angle and inclination angle of the inner fruit pad 68 are maintained while maintaining the contact state of the outer fruit pad 66. By adjusting the advancing / retreating position, the inner fruit pad 68 can be brought into contact with the inner fruit. As shown in FIG. 2, when the outer fruit 86 and the inner fruit 88 are connected with a straight line, the straight line is inclined due to a difference in spatial position between the outer fruit and the inner fruit. In order to move the center point of the inner fruit pad on the straight line connecting the outer fruit and the inner fruit, it is necessary to rotate and tilt the inner fruit pad 68 itself. Each configuration makes it easy.

  FIG. 9 shows an exploded perspective view of the inner and outer fruit holder 76. As shown in the figure, the inner fruit pad 68 is provided at the upper end portion of the vise member 70, and the lower end portion thereof is connected and fixed to the advance / retreat mechanism 79. A rotation ring 72 having an arc shape is attached to the advance / retreat mechanism 79. An arcuate groove 83 is formed in a base 81 as a moving frame, and a pin extending from the rotating ring 72 is inserted into the groove 83 so as to be slidable. By tightening the screw 74 engaged with the pin, the inclination angle of the advance / retreat mechanism 79 can be locked.

  FIG. 10 shows a state where the distal portion of the living body is positioned and fixed by the movable mechanism 26 as the distal fixing mechanism. The heel part is sandwiched by two pads from both sides thereof, thereby restricting the movement of the heel part. In this case, since the outer fruit and inner fruit are used as the positioning reference, the reproducibility of fixation can be improved, and the skin layer at those sites is thin, so that there is an advantage that the distal part can be securely pinched. In particular, one of the outer fruit and the inner fruit is used as the main positioning reference, and the positioning of the other can be performed smoothly after the positioning is completed.

  In the present embodiment, as shown in FIG. 1, the proximal fixing mechanism 100 and the distal fixing mechanism 102 can be interchanged as they are in the X direction, so that both feet can be handled. When measuring a minute displacement of a bone with ultrasonic waves in a state where a three-point bending load is applied, the apparatus may further include a probe holding mechanism, a pressure mechanism, and the like. In the above configuration example, the adjustment of each movable part is artificially performed, but some or all of them may be automatically performed. In that case, from the viewpoint of safety, it is desirable to provide a sensor such as a limit switch as necessary.

  Next, the operation of the biological fixation device according to the present embodiment will be described with reference to FIG. In S101, the lower leg of the right foot or the left foot is inserted into the living body fixing device. In S102, the radial head in the proximal portion of the radius is brought into contact with the radial head fixing portion of the proximal fixation mechanism. In S103, the height of the screw shaft of the proximal inner fixing part is adjusted according to the height of the radial head fixing part, and the scale of the proximal inner fixing part is positioned on the horizontal plate. Further, the lever is rotated so that the inner pad is lightly touching the inside of the knee, and the proximal portion is temporarily fixed from both sides. In S104, the distal fixed portion (movable mechanism) is translated to align in the X direction and the Y direction, and then the height of the external fruit pad is adjusted in the upper and lower parts so that the external fruit is Alignment in the Z direction is performed so as to align with the center position of the pad. In S105, the rotation positions of the θ rotation stage unit and the φ rotation ring (that is, the tilt mechanism) are adjusted, and alignment is performed so that the inner fruit faces the center position of the inner fruit pad. In S106, the vice member 70 is operated so that the endometrial pad presses the endometrium, and the distal fixing portion is fixed. In S107, the proximal inner fixing part is rotated so that the inner pad is pressed against the inner side of the knee to perform the main fixing of the proximal part.

  In the above embodiment, the living body to be diagnosed is the foot, but of course, the same measurement method as described above can be applied to a hand other than the foot or other part. When applying to other parts, it is desirable to change the structure of the measuring mechanism as appropriate according to the target part. For example, it may be possible to reduce the discomfort by dispersing the pressing force at the time of contact by providing a depression in the positioning fixing pad in accordance with the bulging shape of the characteristic bone portion that can be identified from outside the body. . It can also be applied to the radius or ulna of the forearm. It is also possible to use a common fixing mechanism for various parts by exchanging members such as spacer members.

  FIG. 12 shows another embodiment of the biological fixation device. The illustrated biological fixation device 98 can be used alone as a limb fixation device. The living body fixing device 98 can be used for fixing the limb other than the proximal portion, but is particularly suitable for fixing the proximal portion. Here, the proximal portion is, for example, a lower knee part in the lower limb.

  In FIG. 12, the basic structure of the biological fixation device 98 is the same as the proximal fixation mechanism shown in FIG. Specifically, the biological fixation device 98 has two flat plates 122 and 124 that are upright and parallel to each other, and their lower ends 122 a and 124 a are connected by a bottom plate 126. As a result, a U-shaped frame 90 is formed as a whole. The two flat plates 122 and 124 are respectively provided with elongated holes 92a and 92b extending in the vertical direction. A radial head fixing portion (one side holding portion) 120 is attached to the long hole 92a, and an inner side fixing mechanism (other side holding portion) 94 is provided in the long hole 92b. The radial head fixing portion 120 has the same configuration as the radial head fixing portion shown in FIG. 1 or the like (however, a flat plate 122 is provided instead of the vertical plate), and the positioning pad 56 included in the radial head fixing portion 120 has a radial head. Against the skin through the skin layer. The inner fixing portion 94 has the same configuration as the proximal inner fixing portion shown in FIG. 1 and the like (however, a flat plate 124 is provided in place of the scale), and the inner pad 96 is opposite to the radial head. It abuts on the body surface. The positioning pad 56 is made of a material harder than the inner pad 96 and its size is also small. The inner pad 96 has a relatively soft large contact surface, and the contact surface is curved in a concave shape.

  In this embodiment, since the horizontal position of the radial head fixing part 120 and the horizontal position of the inner side fixing mechanism 94 are defined in advance by the frame 90, there is an advantage that the adjustment procedure to be performed when fixing the human body can be reduced. is there. The vertical positions of the radial head fixing portion 120 and the inner fixing portion 94 can be freely adjusted by sliding the shafts in the elongated holes 92a and 92b. The positioning pad 56 is provided so as to be able to advance and retreat as described above, and the inner pad 96 is also provided so as to be able to advance and retreat.

  The living body fixing device 98 has a symmetrical shape in the axial direction of the lower limb with respect to the central axis of the radial head fixing portion serving as a reference position for positioning in order to selectively cope with the left and right lower limbs. ing. The material and size of the positioning pad 56 and the inner pad 96 can be appropriately optimized according to the size of the human body. For example, different parts can be used for adults and children. Since this living body fixing device 98 has a simple configuration, it can be attached to a vertical wall as needed, or can be attached upside down as occasion demands, regardless of the installation location.

  The living body fixing device 98 shown in FIG. 12 can be used alone as the proximal portion fixing device, and in addition thereto, the distal portion fixing device shown in FIG. 1 or the like may be used. It is also possible to use one or more characteristic bone portions other than the radial head as a positioning reference.

It is a perspective view which shows suitable embodiment of the biofixation apparatus which concerns on this invention. It is a figure which shows the external shape of the tibia and rib of the right leg part of a human body. It is a perspective view which shows suitable embodiment of the biofixation apparatus which concerns on this invention. It is a disassembled perspective view of a radial head fixing | fixed part. It is a perspective view of a proximal inner fixing | fixed part. It is a disassembled perspective view of a proximal inner fixing | fixed part. It is a perspective view of a distal fixation mechanism. It is a disassembled perspective view which shows the upper and lower unit structure of a distal fixation mechanism. It is a perspective view which shows the structure of the inner and outer fruit fixation mechanism of a distal fixation mechanism. FIG. 6 is a perspective view showing a preferred embodiment of a distal fixation mechanism. It is a flowchart which shows the use procedure of the biofixation apparatus which concerns on this embodiment. It is a perspective view which shows the biological fixing apparatus which concerns on another embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Living body, 12 Horizontal plate, 20 Radial head fixation part, 26 Movable mechanism, 28 Proximal inner fixation part, 100 Proximal fixation mechanism, 102 Distal fixation mechanism.

Claims (6)

A biological fixation device that fixes a limb while referring to a characteristic bone part that can be identified from outside the body,
A first abutting portion that abuts on the characteristic bone portion in the limb through a skin layer;
A second abutting portion for holding the limb with the first abutting portion;
An advancing / retreating mechanism for moving the second abutting portion relative to the first abutting portion;
A biofixing device comprising: The apparatus of claim 1.
The first contact portion has a first contact surface having a small area,
The second contact portion has a second contact surface having a large area.
A biological fixation device characterized by the above. The apparatus of claim 2.
The first contact portion is configured by a hard member having the first contact surface,
The second contact portion is composed of a soft member having the second contact surface.
A biological fixation device characterized by the above. The apparatus of claim 2.
The second contact surface is configured as a concave curved surface;
A biological fixation device characterized by the above. The apparatus of claim 1.
The limb is a lower limb;
The characteristic bone part is a part that can be identified from the outside through a thin skin layer with a bulge,
A biological fixation device characterized by the above. The apparatus of claim 5.
The characteristic bone portion is a radial head;
A biological fixation device characterized by the above.

Images