JP2012020065A - Device for bone extension treatment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the movement of a fixed part fixed on a bone externally, and to hold a target position without moving the fixed part by an external force.SOLUTION: A casing 1 includes an inscribed gear ring 14 constituted of a magnetic body and an inscribed gear ring 14 eccentric with respect to it and relatively rotatable. A screw shaft 9 integrally rotates with a circumscription gear 7. A moving body 12 is axially moved along with the rotation thereof. A pair of fixed members 23, 24 are provided on the moving body 12 and the outer periphery of a casing 1. The inscribed gear ring 14 provided on a holding body 18 is rocked by composite force of magnetic force of a permanent magnet 17 applying a contact force in a direction of bringing the inscribed gear ring 14 into contact with a predetermined position of the circumscription gear 7 and magnetic force of a plurality of electromagnets 19-21. The circumscription gear 7 and the screw shaft 9 are rotated in accordance with the rocking so as to increase the distance between the fixed members 23, 24 by the rotation.

Description

  The present invention relates to a device for treating bone extension used for treatment of fractures and the like.

Bone parts lost by humans or animals due to fractures, etc. can be reconstructed by extending their own bones, but various bone extension treatment devices aiming for bone extension by moving the bone by the necessary distance for that purpose Is conventionally known.
For example, each of the devices described in Patent Documents 1 to 3 fixes a fixing portion to a pair of bones whose intervals are to be increased, and connects them with a screw shaft, and by rotating the screw shaft, The fixed part is moved with respect to the other fixed part to increase the distance between the two fixed parts.

And the apparatus of patent document 1 is made to move the said fixing | fixed part by exposing the operation part provided in the screw shaft outside the body, and rotating this operation part manually.
The devices of Patent Documents 2 and 3 rotate a screw shaft using a drive mechanism that is detachable with respect to a moving mechanism embedded in the body.

Japanese Patent Laid-Open No. 10-043203 JP 2007-307051 A Special table 2009-542272

Since the manual operation part is always exposed outside the body of the treatment device described in Patent Document 1, there is a possibility that the screw shaft is inadvertently rotated when touched by a hand or the like.
In addition, the devices described in Patent Documents 2 and 3 do not include a stopper mechanism that stops the rotation of the screw shaft with the drive mechanism removed, so that the screw shaft may be rotated by an external force from inside or outside the body. is there.
Thus, when the screw shaft is rotated by an external force, the position of the bone is shifted, and not only does the treatment not proceed as planned, but it may cause pain to the patient.

  The object of the present invention is to allow control of the movement of the fixing portion fixed to the bone from outside the body without exposing the member provided in the body to the outside of the body, and the fixing portion does not move by an external force. It is an object of the present invention to provide a device for treating bone extension that can maintain a position.

  In the first invention, an inscribed ring and a circumscribed member that is eccentric with respect to the inscribed ring and partially contacted with the inscribed ring are provided in the casing, and the inscribed ring and the circumscribed member are in contact with a part of them. In this state, one of the inscribed ring and the circumscribed member is provided with a rotation prevention mechanism for preventing the inscribed ring or the circumscribed member from rotating, and the other inscribed ring is provided. Alternatively, the circumscribing member is connected to a self-rotating inscribed ring or a screw shaft that rotates integrally with the circumscribing member, and the movable body is engaged with the screw shaft so as to be relatively rotatable. A guide mechanism for moving the moving body along the axial direction of the screw shaft while preventing rotation of the moving body; Provided fixing portions for fixing the bone in, provided with a fixing portion for fixing the bone to the moving object, thereby projecting the fixing portion provided on the mobile outside the casing.

Further, in order to bring the inscribed ring and the circumscribed member into contact with each other at a predetermined location, a contact force applying means that always applies a constant force to either the inscribed ring or the circumscribed member is provided, and Either the inscribed ring or the circumscribed member is made of a magnetic body, and further includes a holding body that is separated from the casing and is a separate member. A plurality of electromagnets are provided in a direction away from each other, and these electromagnets are configured to apply a force in a direction against the force of the contact force applying means to the inscribed ring or the circumscribed member made of a magnetic material. A control means for controlling a plurality of electromagnets is provided, and this control means has a combined force in the radial direction obtained by combining the magnetic force exerted by the electromagnet and the force exerted by the contact force applying means. It has a function to change the direction sequentially, and the screw shaft is rotated by swinging either the inner ring or the outer member with the resultant combined force, and the moving body is moved by the rotation of the screw shaft. This is characterized in that the bone extension treatment is performed while increasing the distance between the pair of fixing portions.
The swinging means a motion in which the center of the inscribed ring or the circumscribed member moves while drawing an endless locus, and the inscribed ring or the circumscribed member swings. In addition, the present invention includes both those in which the center rotates and those that do not rotate.

  The second invention is based on the first invention, and the inscribed ring is provided with an anti-rotation mechanism that can be swung, and the inscribed ring is swung by the combined force that is sequentially changed. It was configured to rotate.

  The third invention is based on the first invention, and the inscribed ring is provided with a mechanism for preventing rotation and swing, and the outer member is rotated while being swung by the combined force that is sequentially changed. I made it.

  A fourth invention is based on the first invention, and the outer member is provided with a mechanism for preventing rotation and swinging, and the inner ring is rotated while being swung by the combined force that is sequentially changed. I made it.

  The fifth invention is based on the first invention, and the circumscribed member is provided with an anti-rotation mechanism that can swing, and the inscribed ring is rotated by the combined force that is sequentially changed.

  In the first to fifth inventions, the contact force applying means for applying the contact force in the direction in which the inscribed ring and the circumscribed member provided in the casing are brought into contact at a predetermined location is provided. Even when the magnetic force by the electromagnet does not act on the member, the inscribed ring and the circumscribed member can be brought into contact with each other at a predetermined location, and the relative rotation of both members is prevented by this contact force. Therefore, it is possible to prevent the screw shaft from being easily rotated by an external force and moving the fixed portion provided on the moving body.

Moreover, since the contact force by the said contact force provision means is always acting, it is not necessary to provide an electromagnet equally in the circumferential direction. For this reason, the electromagnet can be concentrated on the outer periphery of the casing while exerting a force in a direction against the contact force.
When the holding body is made to face the casing, a plurality of electromagnets are provided in a direction away from the casing. When the holding body is made to face the casing and the electromagnet is excited, the holding body is made of a magnetic body. A magnetic force directed outward in the diameter direction is applied to the inscribed ring or the circumscribed member.

  In addition, since the holding body provided with the electromagnet is a separate member from the casing, the casing is provided inside the body, the holding body is opposed to the casing from the outside only when necessary, and the electromagnet is controlled to control the fixing portion. The provided moving body can be moved.

Further, the circumscribed member makes an eccentric contact with the inscribed ring, and every member swings one turn around the endless track so that the number of teeth of the inscribed ring and the circumscribed member is the same. Since one member rotates by the difference or the difference between the inner circumference of the inscribed ring and the outer circumference of the circumscribed member, the amount of rotation of the screw shaft with respect to the swing is reduced.
Therefore, it is possible to finely control the amount of movement in the axial direction of the moving body that moves as the screw shaft rotates. In particular, the smaller the difference between the circumferential lengths of the two members, the finer the amount of rotation of the screw shaft can be controlled, and the position of the moving body can be controlled with high accuracy.

According to the second and third inventions, the moving body can be moved by the rotation of the screw shaft connected to the circumscribed member.
According to the fourth and fifth inventions, the moving body can be moved by the rotation of the screw shaft connected to the inscribed ring.

FIG. 1 is a perspective view of the first embodiment. FIG. 2 is a cross-sectional view of the first embodiment. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a perspective view of the second embodiment. FIG. 5 is a cross-sectional view of the second embodiment. 6 is a sectional view taken along line VI-VI in FIG. FIG. 7 is a sectional view taken along line VII-VII in FIG. FIG. 8 is a cross-sectional view of the third embodiment. FIG. 9 is a sectional view of the fourth embodiment.

In the first embodiment shown in FIGS. 1 to 3, a pair of shaft holding members 2 and 3 are fitted to one end side of a cylindrical casing 1 that maintains a predetermined length in the axial direction, while maintaining a gap between them. A shaft holding member 4 is also fitted to the other end of the casing 1.
The shaft holding member 2 positioned outside the pair of shaft holding members 2 and 3 is fitted with a bearing 5, and the shaft holding member 4 is fitted with a bearing 6.

The bearing 5 fitted to the shaft holding member 2 as described above is a circumscribed member of the present invention, and rotatably supports the shaft portion 8 of the circumscribed gear 7 having a gear formed on the outer periphery thereof. It is held between the shaft holding members 2 and 3. Further, the external gear 7 is integrally provided with a shaft portion 10 of a screw shaft 9 on the side opposite to the shaft portion 8, and the shaft portion 10 is positioned inside the shaft holding members 2 and 3. The shaft holding member 3 is rotatably supported.
On the other hand, a shaft portion 11 provided at the tip of the screw shaft 9 is rotatably supported by the bearing 6.

  The moving body 12 is meshed with the screw of the screw shaft 9 as described above. The moving body 12 is inserted into the case from the guide hole 13 which is the guide mechanism of the present invention formed along the axial direction of the casing 1. 1 protrudes outward. When the screw shaft 9 rotates, the moving body 12 is restricted by the guide hole 13 and is prevented from rotating. As the screw shaft 9 rotates, the moving body 12 moves in the axial direction of the screw shaft 9. Moving.

Further, an inscribed gear ring 14 made of a magnetic material and having a gear formed on the inner circumference is provided around the circumscribed gear 7. In other words, the external gear 7 is incorporated in the internal gear ring 14. The inscribed gear ring 14 and the circumscribed gear 7 are decentered from each other, and the inscribed gear ring 14 is configured to be swingable so that the center of the inscribed gear ring 14 draws an endless movement locus. Further, the number of teeth of the external gear 7 is reduced with respect to the number of teeth of the internal gear ring 14, and the internal gear ring 14 and the external gear ring 7 are partially engaged with each other so as to be relatively rotatable. .
The inscribed gear ring 14 constitutes the inscribed ring of the present invention.

The inscribed gear ring 14 configured as described above is provided with a rotation prevention mechanism that swings but prevents its rotation. This rotation prevention mechanism is provided with a regulation pin 15 provided on the side surface of the inscribed gear ring 14. And a restriction hole 16 formed in the shaft holding member 2.
In other words, the inner diameter of the restriction hole 16 is larger than the outer diameter of the restriction pin 15, and the restriction hole 16 and the restriction pin 15 prevent the inscribed gear ring 14 from rotating, and the center draws an endless locus. The internal gear ring 14 is allowed to swing.

Further, a permanent magnet 17 which is a contact force applying means of the present invention is provided at one location of the casing 1 so that the magnetic force of the permanent magnet 17 can be applied to the internal gear ring 14 which is a magnetic body. Yes.
When the magnetic force of the permanent magnet 17 acts on the inscribed gear ring 14, the inscribed gear ring 14 is attracted to the permanent magnet 17 side, and on the side opposite to the permanent magnet 17 as shown in FIG. The gear ring 14 and the external gear 7 are engaged with each other.

On the other hand, a semicircular holding body 18 having a recess 18a along the outer shape of the casing 1 is provided, and the holding body 18 is provided with three electromagnets 19 to 21 and any of these electromagnets 19 to 21 is excited. Control means (not shown) for controlling the timing is provided.
The holding body 18 is provided with electromagnets 19 to 21 in a direction away from the casing 1 with the concave portion 18 a facing the casing 1.
The moving body 12 meshed with the screw shaft 9 is provided with a fixing member 23 that is a fixing portion for fixing to the bone, and also on the outer side of the casing 1 that is collinear with the fixing member 23 and is opposed thereto. A fixing member 24 for fixing to the bone is provided. Each of the fixing members 23 and 24 is provided with screw holes 23a and 24a, and the fixing members 23 and 24 are screwed to the bones using the screw holes 23a and 24a.
In FIG. 1, the pair of fixing members 23 and 24 are omitted.

Next, the case where the external gear 7 is rotated to move the moving body 12 in the axial direction will be described.
In this embodiment, the casing 1 is provided in the patient's body, and the pair of fixing members 23 and 24 are screwed to a pair of bones whose intervals are to be increased.
First, the concave portion 18a of the holding body 18 is opposed to the casing 1 on the side opposite to the permanent magnet 17, and the electromagnets 19 to 21 are concentrated in a semicircle on the side opposite to the permanent magnet 17, as shown in FIG. Are arranged at regular intervals. Thus, in order to make the recess 18a of the holding body 18 face the side opposite to the permanent magnet 17, it is necessary to position the permanent magnet 17 on the side opposite to the skin when the casing 1 is installed in the body. .
At this time, if the electromagnets 19 to 21 are kept in a non-excited state, the internal gear ring 14 is attracted to the permanent magnet 17, and the internal gear ring 14 and the external gear are opposite to the permanent magnet 17. 7 meshes.

  If the electromagnets 19 to 21 are sequentially excited in the circumferential direction using the control means from the above state, the inscribed gearing 14 will attract the attracting force of the permanent magnet 17 and the attracted electromagnets 19 to 21. The combined force in the radial direction due to the force changes in the circumferential direction. With this changing synthetic force, the inscribed gear ring 14 performs a swinging motion in which the center draws an endless locus. When the inscribed gear ring 14 swings as described above, the meshing position between the inscribed gear ring 14 and the circumscribed gear 7 is sequentially shifted in the circumferential direction, and the endless locus is swung once to make one round. The circumscribed gear 7 rotates by a difference in the number of teeth from the inscribed gear ring 14.

For example, when only the electromagnet 19 is excited from the state of FIG. 3 in which all the electromagnets 19 to 21 are not excited, the combined force of the magnetic force of the electromagnet 19 and the magnetic force of the permanent magnet 17 is the same as the magnetic force of the electromagnet 19. The force is directed outward from the middle of the permanent magnet 17 and attracts the inscribed gear ring 14 toward the casing 1 in the middle of the electromagnet 19 and the permanent magnet 17. Next, when the electromagnet 20 is excited, the combined force of the permanent magnet 17, the electromagnet 19, and the electromagnet 20 acts at a position farther from the permanent magnet 17 than the combined force of the permanent magnet 17 and the electromagnet 19. Then, the inscribed gear ring 14 is attracted.
Furthermore, if the electromagnetic magnet 21 is excited, the combined force to which the magnetic force of the electromagnet 21 is applied acts in the direction opposite to the permanent magnet 17, that is, in the direction of the electromagnet 20, and attracts the inscribed gear ring 14.

  Next, when the electromagnet 19 is de-excited, the direction of the resultant force moves from the electromagnet 20 to the electromagnet 21 side. Similarly, if the electromagnet 20 is de-energized and then the electromagnet 21 is sequentially de-energized, the direction of the resultant force moves in the circumferential direction, and all returns to the non-excited state of FIG. As described above, when the direction of the combined force of the magnetic force of the permanent magnet 17 and the magnetic force of the electromagnets 19 to 21 moves along the circumference, the inscribed gear ring 14 that contacts the direction opposite to the direction of the combined force and the circumscribed gear ring 14 are contacted. The contact position with the gear 7 is also moved, and the outer gear 7 is rotated by the difference in the number of teeth from the inner gear ring 14 for each round.

Further, as described above, the electromagnets 19 to 21 are sequentially excited in the circumferential direction. At this time, by exciting one of the electromagnets at the same time or individually controlling the magnitude of the magnetic force. The meshing position between the inscribed gear ring 14 and the circumscribed gear 7 can be moved stepwise in the circumferential direction to obtain a smoother rotational force.
The method for controlling the electromagnet is not limited to the above example, and various methods are conceivable for obtaining a smoother rotational force.
When the circumscribed gear 7 rotates as described above, the screw shaft 9 rotates accordingly, and the moving body 12 whose rotation is restricted by the guide hole 13 moves along the screw shaft 9.

If the moving body 12 is moved in the direction of the arrow x in the figure according to the rotation direction of the screw shaft 9, the distance between the fixing member 23 provided on the moving body 12 and the fixing member 24 provided on the casing 1 increases. Can widen the bone spacing. The rotation directions of the external gear 7 and the screw shaft 9 can be controlled by the excitation timing of the electromagnets 19-21.
In FIG. 3, the recess 18a of the holding body 18 and the outer periphery of the casing 1 are shown in close contact with each other. However, when the device of the first embodiment is used for bone extension treatment, Between the casing 1 is the patient's skin.

  In addition, the bone extension treatment device according to the first embodiment has an internal gear by the attractive force of the permanent magnet 17 which is a contact force applying means when the electromagnets 19 to 21 are in a non-excited state as described above. The ring 14 and the external gear 7 are engaged with each other. Therefore, the internal gear ring 14 and the external gear 7 are not relatively rotated by an external force, and the position of the moving body 12 can be maintained. Therefore, the fixing member 23 provided on the moving body 1 does not move and the interval between the pair of fixing members 23 and 24 does not change.

The second embodiment shown in FIGS. 4 to 7 is configured such that the inscribed gear ring 14 made of a magnetic material swings and rotates. FIGS. 5 to 7 show that the combined force of the electromagnets 19 to 21 is a permanent magnet. 17 shows a state of acting in the opposite direction to the suction force of 17.
The swing motion is a motion that rotates while performing a swing motion whose center draws an endless locus.
In the second embodiment, the inscribed gear ring 14 is incorporated in the casing 1 so as to be capable of rotating in a swingable state in which the center draws an endless locus.

In the inscribed gear ring 14 as described above, the inscribed gear 7 having a smaller number of teeth is incorporated in an eccentric manner with respect to the inscribed gear ring 14. 22 is provided, and the shaft portion 22 is fixed to the casing 1. The shaft portion 22 and the casing 1 to which the shaft portion 22 is fixed constitute the rotation prevention mechanism of the present invention.
The inscribed gear ring 14 is provided with the screw shaft 9 integrally, and the shaft portion 11 provided at the tip of the screw shaft 9 is provided with the bearing 6 provided on the shaft holder 4 as in the first embodiment. It is supported by. However, the inner diameter of the bearing 6 is larger than the inner diameter of the shaft portion 11 so that the center of the shaft portion 11 can swing along the same locus as the movement locus drawn by the center of the inscribed gear ring 14.

The screw shaft 9 is provided with a moving body 12. The moving body 12 includes a moving portion 12a fitted directly to the screw shaft 9 and an output portion 12b attached to the moving portion 12a. A gap 12c is formed between the output part 12b and the moving part 12a, and the moving part 12a and the output part 12b move relative to each other within the range of the gap 12c to absorb the oscillation of the screw shaft 9. I am doing so.
Further, the output portion 12b is provided with a fixing member 23 that is a fixing portion for fixing to the bone, and fixing for fixing the bone to the outside of the casing 1 that is collinear with and opposite to the fixing member 23. A member 24 is provided. Each of the fixing members 23 and 24 includes screw holes 23a and 24a, and the fixing members 23 and 24 are screwed to the bone using the screw holes 23a and 24a.
In FIG. 4, the pair of fixing members 23 and 24 are omitted.

Reference numeral 12d in the figure is a groove formed on the side surface of the output portion 12b. The groove 12d and the edge of the guide hole 13 are fitted to each other, preventing the output portion 12b from coming out of the guide hole 13, and the moving body 12d. The rotation of the is regulated.
Moreover, the point which makes the holding body 18 which has the recessed part 18a hold | maintain the several electromagnets 19-21 is the completely same as 1st Embodiment.

In the second embodiment as described above, the principle that the inscribed gear ring 14 swings so that the center of the inscribed gear ring 14 draws an endless locus and the inscribed gear ring 14 and the circumscribed gear 7 rotate relative to each other is the first. This is the same as the embodiment.
That is, the holding body 18 is opposed to the casing 1 on the side opposite to the permanent magnet 17 which is the contact force applying means of the present invention, and the electromagnet is placed in a semicircle on the side opposite to the permanent magnet 17 as shown in FIG. 19 to 21 are intensively arranged at equal intervals.
At this time, if the electromagnets 19 to 21 are kept in a non-excited state, the internal gear ring 14 is attracted to the permanent magnet 17, and the internal gear ring 14 and the external gear are opposite to the permanent magnet 17. 7 meshes.

  If the electromagnets 19 to 21 are sequentially excited in the circumferential direction using the control means from the above state, the inscribed gearing 14 will attract the attracting force of the permanent magnet 17 and the attracted electromagnets 19 to 21. The combined force in the radial direction due to the force changes in the circumferential direction. With this changing synthetic force, the inscribed gear ring 14 performs a swinging motion in which the center draws an endless locus. When the inscribed gear ring 14 swings as described above, the meshing position between the inscribed gear ring 14 and the circumscribed gear 7 is sequentially shifted in the circumferential direction, and the endless locus is swung once to make one round. The inscribed gear ring 14 rotates by a difference in the number of teeth from the inscribed gear 7.

Further, as described above, the electromagnets 19 to 21 are sequentially excited in the circumferential direction. At this time, any one of the electromagnets is simultaneously excited or their excitation force is controlled to thereby increase the internal gear. The meshing position between the ring 14 and the circumscribed gear 7 can be moved steplessly in the circumferential direction and rotated more smoothly.
If the inscribed gear ring 14 swings and rotates as described above, the screw shaft 9 also swings and rotates, so that the moving body 12 moves along the screw shaft 9 along with the rotation. At this time, the moving portion 12a also swings, but the swing is absorbed by the gap 12c.

Also in the second embodiment, each fixing member is controlled by controlling the rotation direction of the screw shaft 9 so that the moving body 12 moves in the direction of the arrow x in the drawing, that is, in the direction away from the fixing member 24 provided in the casing 1. The space | interval of the bone fixed to 23,24 can be expanded.
In FIG. 6, the recess 18 a of the holding body 18 and the outer periphery of the casing 1 are shown in close contact with each other. However, when the apparatus of the second embodiment is used for bone extension treatment, the recess 18 a Between the casing 1 is the patient's skin.

  The bone extension treatment apparatus of the second embodiment also has an inscribed gear by the attractive force of the permanent magnet 17 that is a contact force applying means when the electromagnets 19 to 21 are in a non-excited state as described above. The ring 14 and the external gear 7 are engaged with each other. Therefore, the internal gear ring 14 and the external gear 7 are not relatively rotated by an external force, and the position of the moving body 12 can be maintained. Therefore, the fixing member 23 provided on the moving body 1 does not move and the distance between the pair of fixing members 23 and 24 does not change.

  In the third embodiment shown in FIG. 8, the inscribed gear ring 14 is rotatably incorporated in the casing 1, and the screw shaft 9 is integrally provided on one side surface of the inscribed gear ring 14. Further, the shaft portion 11 at the tip of the screw shaft 9 is rotatably supported by a bearing 6 having the same configuration as that of the first embodiment.

Further, the same moving body 12 as that of the first embodiment is engaged with the screw shaft 9.
The moving body 12 aligned with the screw shaft 9 is provided with a fixing member 23 that is a fixing portion for fixing to the bone, and is also fixed to the outside of the casing 1 that is collinear with the fixing member 23 and is opposed thereto. A fixing member 24 is provided. The fixing members 23 and 24 are provided with screw holes 23a and 24a, respectively, and the screw holes 23a and 24a are used to fix the fixing members 23 and 24 to the bone. Is the same.

On the other hand, an external gear 7 having a smaller number of teeth is incorporated in the internal gear ring 14 while being eccentric with respect to the internal gear ring 14, and the internal gear ring 14 includes the internal gear ring 14. The rocking body 7a is integrally provided so as to protrude outward, which is the opposite side.
The outer diameter of the oscillating body 7a is larger than that of the circumscribed gear 7, and the size of the oscillating body 7a oscillating while contacting the casing 1 is maintained in the process of oscillating the outer gear 7 and the oscillating body 7a. ing.
The external gear 7 and the rocking body 7a are integrally formed of a magnetic body. However, the external gear 7 and the rocking body 7a are separated, and at least the rocking body 7a is made of a magnetic body. It may be configured.

  A shaft portion 8 is provided on the outer side of the swinging body 7a as described above, that is, on the side surface opposite to the circumscribed gear 7, and this shaft portion 8 is supported by the bearing 5 similar to that of the first embodiment. However, the inner diameter of the bearing 5 is larger than the inner diameter of the shaft portion 8 so that the center of the shaft portion 8 can swing along the same locus as the movement locus drawn by the center of the circumscribed gear 7.

Further, the rocking body 7a is provided with a rotation prevention mechanism that rocks but prevents its rotation. This rotation prevention mechanism is constituted by a restriction pin 15 provided on the side surface of the rocking body 7 a and a restriction hole 16 formed in the shaft holding member 2.
That is, the inner diameter of the restriction hole 16 is larger than the outer diameter of the restriction pin 15, and the restriction hole 16 and the restriction pin 15 prevent the circumscribed gear 7 from rotating, and the circumscribed gear that draws an endless locus at the center. 7 is allowed to swing.

Further, a permanent magnet 17 which is a contact force applying means of the present invention is provided at one position of the casing 1 and corresponding to the rocking body 7a, and the magnetic force of the permanent magnet 17 is a magnetic body. It is made to act on the rocking body 7a.
When the magnetic force of the permanent magnet 17 acts on the oscillating body 7a, the oscillating body 7a is attracted to the permanent magnet 17 side, and the internal gear ring 14 and the external gear 7 are engaged with each other on the permanent magnet 17 side.

And the recessed part 18a of the holding body 18 made into the same structure as 1st Embodiment is made to oppose the casing 1 on the opposite side to the permanent magnet 17, and the electromagnets 19-21 are concentrated in the semicircle on the opposite side to the permanent magnet 17. To be arranged at regular intervals.
At this time, if the electromagnets 19 to 21 are kept in a non-excited state, the external gear 7 is attracted to the permanent magnet 17 together with the oscillating body 7a as described above, and on the permanent magnet 17 side, the internal gear ring 14 and Engage with the external gear 7.

  If the electromagnets 19 to 21 are sequentially excited in the circumferential direction by using the same control means as in the first embodiment from the above state, the external gear 7 will attract the permanent magnet 17 and the excited electromagnet 19. The combined force in the radial direction due to the suction force of ˜21 changes in the circumferential direction. Due to this changing synthetic force, the circumscribed gear 7 performs a swinging motion in which the center draws an endless locus. If the circumscribed gear 7 swings as described above, the meshing position between the inscribed gear ring 14 and the circumscribed gear 7 is sequentially shifted in the circumferential direction. The contact gear ring 14 rotates by the difference in the number of teeth from the external gear 7.

Further, as described above, the electromagnets 19 to 21 are sequentially excited in the circumferential direction. At this time, any one of the electromagnets is simultaneously excited or their excitation force is controlled to thereby increase the internal gear. The meshing position between the ring 14 and the circumscribed gear 7 can be moved steplessly in the circumferential direction to obtain a smoother rotational force.
If the inscribed gear ring 14 is rotated as described above, the screw shaft 9 is also rotated, so that the moving body 12 is moved along the screw shaft 9 with the rotation.

Also in the third embodiment, each fixing member is controlled by controlling the rotation direction of the screw shaft 9 so that the moving body 12 moves in the direction of the arrow x in the drawing, that is, in the direction away from the fixing member 24 provided in the casing 1. The space | interval of the bone fixed to 23,24 can be expanded.
The bone extension treatment apparatus of the third embodiment also has an inscribed gear by the attractive force of the permanent magnet 17 that is a contact force applying means when the electromagnets 19 to 21 are in a non-excited state as described above. The ring 14 and the external gear 7 are engaged with each other. Therefore, the internal gear ring 14 and the external gear 7 are not relatively rotated by an external force, and the position of the moving body 12 can be maintained. Therefore, the fixing member 23 provided on the moving body 1 does not move and the interval between the pair of fixing members 23 and 24 does not change.

The fourth embodiment shown in FIG. 9 is configured such that the external gear 7 made of a magnetic material swings and rotates. In FIG. 9, the combined force of the electromagnets 19 to 21 is the attraction force of the permanent magnet 17. It shows the state acting in the opposite direction.
The swing motion is a motion that rotates while performing a swing motion whose center draws an endless locus.
In the fourth embodiment, the inscribed gear ring 14 is assembled and fixed to the casing 1, but the structure for fixing the inscribed gear ring 14 to the casing 1 in this way constitutes the rotation prevention mechanism of the present invention. It will be.

In the inscribed gear ring 14 fixed to the casing 1, the inscribed gear 7 made of a magnetic material having a smaller number of teeth is incorporated eccentrically with respect to the inscribed gear ring 14 and is the same as in the first embodiment. On the basis of the above principle, the external gear 7 is swingable with respect to the internal gear ring 14.
A shaft portion 8 is provided on the outer surface of the circumscribed gear 7 as described above, and this shaft portion 8 is supported by the bearing 5 similar to that of the first embodiment. However, the inner diameter of the bearing 5 is larger than the inner diameter of the shaft portion 8 so that the center of the shaft portion 8 can swing along the same locus as the movement locus drawn by the center of the circumscribed gear 7.

Further, a swinging body 7a is integrally provided on the side surface of the circumscribed gear 7 opposite to the shaft portion 8, and the outer diameter of the swinging body 7a is larger than that of the circumscribed gear 7, and the outer gear 7 and In the process of swinging and rotating the swinging body 7a, the swinging body 7a can swing and rotate while contacting the casing 1.
The external gear 7 and the rocking body 7a are integrally formed of a magnetic body. However, the external gear 7 and the rocking body 7a are separated, and at least the rocking body 7a is made of a magnetic body. It may be configured.

  Further, a screw shaft 9 is integrally provided on one side surface of the rocking body 7 a, that is, on the side surface opposite to the shaft portion 8. Further, the shaft portion 11 at the tip of the screw shaft 9 is rotatably supported by a bearing 6 having the same configuration as that of the first embodiment. However, the inner diameter of the bearing 6 is made larger than the inner diameter of the shaft portion 11 so that the center of the shaft portion 11 can swing and rotate along the same locus as the movement locus drawn by the center of the circumscribed gear 7.

The same moving body 12 as that of the second embodiment is engaged with the screw shaft 9.
Further, the output portion 12b of the moving body 12 is provided with a fixing member 23 that is a fixing portion for fixing to the bone, and the fixing member 23 is also provided on the outside of the casing 1 that is collinear with and opposite to the fixing member 23. A certain fixing member 24 is provided. Each of the fixing members 23 and 24 includes screw holes 23a and 24a, respectively, and the screw holes 23a and 24a are used to screw the fixing members 23 and 24 to the bone. Is the same.

Further, a permanent magnet 17 as contact force applying means of the present invention is provided at a position corresponding to the rocking body 7a in one location of the casing 1, and the magnetic force of the permanent magnet 17 is applied to the rocking body 7a. It is made to act.
When the magnetic force of the permanent magnet 17 acts on the oscillating body 7a, the oscillating body 7a is attracted to the permanent magnet 17 side, and the internal gear ring 14 and the external gear 7 are engaged with each other on the permanent magnet 17 side.

And the recessed part 18a of the holding body 18 made into the same structure as 1st Embodiment is made to oppose the casing 1 on the opposite side to the permanent magnet 17, and the electromagnets 19-21 are concentrated in the semicircle on the opposite side to the permanent magnet 17. To be arranged at regular intervals.
At this time, if the electromagnets 19 to 21 are kept in a non-excited state, the external gear 7 is attracted to the permanent magnet 17 together with the oscillating body 7a as described above, and on the permanent magnet 17 side, the internal gear ring 14 and Engage with the external gear 7.

  If the electromagnets 19 to 21 are sequentially excited in the circumferential direction by using the same control means as in the first embodiment from the above state, the external gear 7 will attract the permanent magnet 17 and the excited electromagnet 19. The combined force in the radial direction due to the suction force of ˜21 changes in the circumferential direction. Due to this changing synthetic force, the circumscribed gear 7 performs an oscillating rotational movement in which the center draws an endless locus. If the circumscribed gear 7 swings and rotates as described above, the meshing position between the inscribed gear ring 14 and the circumscribed gear 7 is sequentially shifted in the circumferential direction, and the endless locus is swung once to make one round. The internal gear ring 14 and the external gear 7 are relatively rotated by the difference in the number of teeth.

Further, as described above, the electromagnets 19 to 21 are sequentially excited in the circumferential direction. At this time, any one of the electromagnets is simultaneously excited or their excitation force is controlled to thereby increase the internal gear. The meshing position between the ring 14 and the circumscribed gear 7 can be moved steplessly in the circumferential direction to obtain a smoother rotational force.
If the circumscribed gear 7 is swung and rotated as described above, the screw shaft 9 is also swung and rotated, so that the moving body 12 moves along the screw shaft 9 with the rotation.
In addition, since the gap 12c same as 2nd Embodiment is formed between the output part 12b of the mobile body 12, and the moving part 12a, the moving part 12a and the output part 12b are within the range of this gap 12c. Relative movement absorbs the oscillation of the screw shaft 9.

In the fourth embodiment, the rotational direction of the screw shaft 9 is controlled so that the moving body 12 moves in the direction of the arrow x in the figure, that is, in the direction away from the fixing member 24 provided in the casing 1. The space | interval of the bone fixed to the fixing members 23 and 24 can be expanded.
In addition, the bone extension treatment device according to the first embodiment has an internal gear by the attractive force of the permanent magnet 17 which is a contact force applying means when the electromagnets 19 to 21 are in a non-excited state as described above. The ring 14 and the external gear 7 are engaged with each other. Therefore, the internal gear ring 14 and the external gear 7 are not relatively rotated by an external force, and the position of the moving body 12 can be maintained. Therefore, the fixing member 23 provided on the moving body 1 does not move and the interval between the pair of fixing members 23 and 24 does not change.

Since the holding body 18 of the first to fourth embodiments includes the recess 18a corresponding to the outer periphery of the casing, even if there is skin or the like between the recess 18a and the casing, it is easy to correspond to each other. Moreover, the holding body 18 and the casing 1 can be brought close to each other. Therefore, the magnetic force of the electromagnet can be more efficiently applied to the inscribed ring or the circumscribed member made of a magnetic material.
However, the shape of the holding body 18 is not limited to that in which the concave portion 18a is formed. For example, a plurality of electromagnets may be provided by projecting the tip from a plate-shaped holding body, and the plurality of electromagnets may be arranged radially as illustrated.

Further, in each of the above embodiments, the magnetic force of the electromagnets 19 to 21 is used to swing the inscribed gear ring 14 or the circumscribed gear 7, so that the inscribed structure composed of these electromagnets 19 to 21 and a magnetic material is used. There is no need to contact the gear ring 14 or the external gear 7 directly. Therefore, the screw shaft 9 can be rotated by the magnetic force from outside the body without exposing the member in the casing 1 installed in the body to the outside of the body.
Furthermore, since the electromagnets 19 to 21 are provided in the holding body 18 which is a separate member from the casing 1, the holding body 18 is provided from the outside of the casing 1 to the casing 1 provided in the patient's body only when necessary. Can be close to 1.

In each of the above embodiments, the attractive force of the permanent magnet 17 is used as the contact force applying means. However, the repulsive force of the permanent magnet may be used. In this case, for example, the permanent magnet 17 shown in FIG. 3 is provided on the diametrically opposite side with the inscribed gear ring 14 interposed therebetween, and a permanent magnet is provided around the inscribed gear ring 14. The magnetic poles of both permanent magnets are arranged so that a repulsive force is generated between the permanent magnet 17 and the permanent magnet of the inscribed gear ring 14.
If it does in this way, electromagnets 19-21 can be controlled, and external gear 7 can be rotated like a 1st embodiment.

In the above case, since the permanent magnet 17 is also positioned on the holding body 18 side, all of the permanent magnet 17 and the electromagnets 19 to 21 can be combined on the holding body 18 side, which is opposite to the holding body 18. The side can be opened in space.
It should be noted that the concept of using the repulsive force of the permanent magnet can be used for all of the second to fourth embodiments.

Furthermore, a spring may be used as the contact force applying means, and a pressing force or a pulling force may be exhibited using the elastic force of the spring. And when using the pressing force of this spring, the said spring can be put together on the holding body 18 side with the said electromagnets 19-21.
However, it is necessary to attach a permanent magnet or a spring serving as the contact force applying means to the casing 1 side instead of the holding pair 18. Thus, by attaching the contact force applying means to the casing side, the contact force can be applied to the internal gear ring 14 and the external gear 7 even when the holding body 18 is separated from the casing 1.

  In each of the above embodiments, gears such as the inscribed gear ring and the circumscribed gear are used. However, the inscribed ring and the circumscribed member may be of any type as long as the mutual frictional force can be maintained. And even if it is an inscribed ring and a circumscribed member which are not provided with a gear, if the contact force by the contact force applying means is applied, the inscribed ring can be used even when the magnetic force of the electromagnets 19 to 21 is not applied. In addition, the frictional force at the contact portion of the circumscribed member is increased, and the relative rotation is not easily caused by the external force. That is, it is possible to prevent the fixed portion from moving carelessly.

Furthermore, in each said embodiment, the member which connected the screw shaft 9 is rotated by rocking | fluctuating either the internal gear ring 14 or the external gear 7 using the attractive force of the electromagnets 19-21. Therefore, the screw shaft 9 rotates by the difference in the number of teeth of the two gears for every one swing in which the center of the inscribed gear ring 14 or the inscribed gear 7 makes one turn while drawing the endless movement locus. Therefore, the amount of rotation of the screw shaft 9 is smaller than the movement of the contact position of both gears that move by exciting the electromagnets 19 to 21 sequentially.
Accordingly, the amount of rotation can be finely controlled, and as a result, the position of the moving body 12 can also be accurately controlled.
This is also true when the inscribed ring and the circumscribed member are not equipped with a gear. That is, every time one of the inscribed ring and the circumscribed ring swings, both members rotate relative to each other by the difference between the inner circumference of the inscribed ring and the outer circumference of the circumscribed member. The amount of rotation can be finely controlled. In particular, if the difference between the inner circumference of the inscribed ring and the outer circumference of the circumscribed member is reduced, the position of the moving body, that is, the positioning accuracy of the fixed portion can be further increased.

  The device for treating bone extension according to the present invention is useful not only for fractures but also for various treatments that require widening the interval between adjacent bones. For example, when inconvenience arises due to the small size of a specific bone, treatment may be performed to promote bone growth by cutting the bone halfway and creating a gap in the cut portion. Even in such a treatment, the above-mentioned bone lengthening treatment apparatus can be used to create a gap in the cut portion of the bone.

DESCRIPTION OF SYMBOLS 1 Casing 7 Outer gear 9 (It is a circumscribed member) Screw shaft 12 Mobile body 14 Inscribed gear ring 15 (It is an inscribed ring) Restriction pin 16 (Structures a rotation prevention mechanism) Restriction Hole 17 (A contact force applying means) Permanent magnet 18 Holding body 19 Electromagnet 20 Electromagnet 21 Electromagnet 23 Fixing member 24 Fixing member

Claims (5)

  In the casing, an inscribed ring and a circumscribed member that is eccentric with respect to the inscribed ring and in contact with a part of the inscribed ring are provided. In addition, either one of the inscribed ring or the circumscribed member is provided with a rotation prevention mechanism for preventing the inscribed ring or the circumscribed member from rotating, and the other inscribed ring or circumscribed member is A screw shaft that rotates integrally with a self-rotating inscribed ring or a circumscribed member is connected, and the moving body is engaged with the screw shaft so as to be relatively rotatable, and when the screw shaft is rotated, the moving body is A guide mechanism for moving along the axial direction of the screw shaft while preventing rotation is fixed to the bone outside the casing. A fixing portion for fixing to the bone is also provided on the moving body, the fixing portion provided on the moving body protrudes outward of the casing, and the inscribed ring and the outer member are connected to each other. In order to bring them into contact with each other at a predetermined location, contact force applying means for applying a constant force to any one of the inscribed ring and the circumscribed member is provided, and either the inscribed ring or the circumscribed member is provided. And a plurality of electromagnets provided in a direction away from the casing in a state in which the holding body is opposed to the casing, and separated from the casing. The electromagnet is configured to apply a force in a direction against the force of the contact force applying means to the inscribed ring or the circumscribed member made of a magnetic material, and controls the plurality of electromagnets. The control means has a function of sequentially changing the resultant force in the radial direction, which combines the magnetic force exerted by the electromagnet and the force exerted by the contact force applying means, in the circumferential direction. The screw shaft is rotated by swinging either the inscribed ring or the circumscribed member with the combined force, and the distance between the pair of fixed portions is increased by moving the moving body by the rotation of the screw shaft. A device for treating bone extension while performing bone extension treatment.   2. The bone extension treatment according to claim 1, wherein the inscribed ring is provided with an anti-rotation mechanism that can be swung, and the inscribed ring is swung by the combined force that is sequentially changed to rotate the circumscribed member. apparatus.   The bone extension treatment device according to claim 1, wherein the inscribed ring is provided with a mechanism for preventing rotation and swinging, and is configured to rotate while rotating the circumscribed member by the sequentially changed synthetic force.   The bone extension treatment device according to claim 1, wherein the circumscribed member is provided with a mechanism for preventing rotation and swinging, and is configured to rotate while rotating the inscribed ring by the combined force that is sequentially changed.   2. The bone extension treatment device according to claim 1, wherein the circumscribed member is provided with a rotation preventing mechanism that can swing, and the inscribed ring is rotated by the synthetic force that is sequentially changed.

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