Magnetic traction type bone lengthening device

Abstract

The invention relates to the technical field of bone lengthening devices, in particular to a magnetic traction type bone lengthening device which comprises a built-in part arranged in a limb of a patient and an external part arranged outside the limb of the patient, the built-in part comprises an intraosseous nail arranged in a marrow cavity of a broken bone of the patient, and at least two magnetic bone fixing blocks are arranged on the intraosseous nail; clamping blocks are elastically connected to the interiors of the bone fixing blocks, a plurality of clamping grooves matched with the clamping blocks are formed in the intraosseous nail, the external part comprises at least two lantern rings arranged outside the limbs of the patient in a sleeving mode and matched with the bone fixing blocks, and a plurality of electromagnetic blocks matched with the bone fixing blocks are symmetrically arranged on the lantern rings; and one lantern ring can move along the direction of the intraosseous nail. Therefore, when the limb of the patient is assisted in normal growth, the operation steps during single-time adjustment are simplified, the operation time during single-time adjustment is shortened, the infection risk is reduced, the structure arranged in the limb of the patient is simplified, and the comfort of the patient is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bone lengthening devices, and particularly to a magnetic traction bone lengthening device. Background Art

[0002] Limb lengthening and bone deformity correction surgeries are common surgeries mainly used to treat congenital or acquired limb length inequality, pathological short stature and other diseases. Bone lengthening, that is, distraction osteogenesis, means cutting the bone mass, retaining the soft tissues and blood supply, fixing both ends with a special traction device, and gradually applying tensile force to slowly pull the bone segment according to the law of tensile stress, continuously stimulating the body tissues, stimulating the potential of human tissue regeneration, so that new bone is formed in the osteotomy gap to achieve the purpose of bone regeneration.

[0003] Currently, existing bone lengthening devices, such as the Chinese patent with the publication number CN118557267A, disclose a magnetic drive bone lengthening device, including a magnetic drive device which includes a rotating shaft and a magnetic drive member sleeved on the rotating shaft, a transmission device which includes a speed reducer connected to the output end of the rotating shaft and a transmission shaft connected to the output end of the speed reducer, an extension rod whose one end is connected to the output end of the transmission shaft and the other end extends out of the housing of the magnetic drive bone lengthening device, a housing, at least two groups of positioning holes arranged on the housing, and a positioning bolt corresponding to each group of the at least two groups of positioning holes for fixing the magnetic drive bone lengthening device to fit on the bone surface. The magnetic drive member is driven to rotate by the magnetic field generated by an external electromagnetic driver, and the rotational movement of the magnetic drive member sequentially passes through the magnetic drive device and the transmission device to make the extension rod extend or retract axially. However, when the above device is used, the structure inside the patient's limb is complex, which not only has a high manufacturing cost but also increases the discomfort of the patient.

[0004] How to assist the normal growth of the patient's limb while simplifying the operation steps during single adjustment, reducing the operation time during single adjustment, avoiding forming too many wounds on the patient's limb, reducing the infection risk, and simplifying the structure placed inside the patient's limb to improve the comfort of the patient has become a technical problem that needs to be broken through.

[0005] In summary, it is obvious that the prior art has inconveniences and defects in actual use, so it is necessary to improve. Summary of the Invention

[0006] Aiming at the above defects, the purpose of the present invention is to provide a magnetic traction bone lengthening device, which can assist the normal growth of the patient's limb while simplifying the operation steps during single adjustment, reducing the operation time during single adjustment, avoiding forming too many wounds on the patient's limb, reducing the infection risk, and simplifying the structure placed inside the patient's limb to improve the comfort of the patient.

[0007] To achieve the above object, the present invention provides a magnetic traction bone lengthening device, which includes an internal part disposed inside the patient's limb and an external part disposed outside the patient's limb. The internal part includes an intramedullary nail inserted into the medullary cavity of the patient's fractured bone. At least two magnetic bone fixation blocks are provided on the intramedullary nail. Elastic blocks are connected inside each of the bone fixation blocks, and a number of card slots cooperating with the blocks are provided on the intramedullary nail.

[0008] The external part includes at least two collars sleeved outside the patient's limb and cooperating with the bone fixation blocks. A number of electromagnetic blocks cooperating with the bone fixation blocks are symmetrically provided on each collar, and one of the collars can move along the direction of the intramedullary nail.

[0009] According to the magnetic traction bone lengthening device of the present invention, drive rods are symmetrically inserted between a number of collars. One of the collars is threadedly connected to the drive rod, and the remaining collars are rotatably connected to the drive rod.

[0010] According to the magnetic traction bone lengthening device of the present invention, each of the collars includes two symmetrically arranged half-rings, and a number of half-ring connecting members are connected between the two half-rings.

[0011] According to the magnetic traction bone lengthening device of the present invention, each of the half-ring connecting members includes a connecting sleeve rod and a connecting inner rod respectively elastically connected to the two half-rings. An avoidance groove cooperating with the connecting inner rod is provided on the connecting sleeve rod. A number of locking members are elastically connected to both the connecting sleeve rod and the connecting inner rod. Locking holes cooperating with the locking members on the connecting sleeve rod are provided on the half-ring where the connecting inner rod is located, and locking holes cooperating with the locking members on the connecting inner rod are provided in the avoidance groove of the connecting sleeve rod.

[0012] According to the magnetic traction bone lengthening device of the present invention, insertion blocks are symmetrically provided on the connecting sleeve rods inside the half-rings. Slots cooperating with the insertion blocks are provided inside each of the half-rings. The insertion blocks are slidably arranged in the slots, and elastic members are provided between the insertion blocks and the slots.

[0013] According to the magnetic traction bone lengthening device of the present invention, fixing heads are provided at one end of the connecting sleeve rod away from the connecting inner rod and one end of the connecting inner rod away from the connecting sleeve rod.

[0014] According to the magnetic traction bone lengthening device of the present invention, sliders are symmetrically provided on the blocks inside the bone fixation blocks. Sliding grooves cooperating with the sliders are provided inside the bone fixation blocks. The sliders are slidably arranged in the sliding grooves, and elastic sheets are provided between the blocks and the bone fixation blocks. A protrusion is provided at one end of the block away from the elastic sheet, and the protrusion penetrates through the bone fixation block.

[0015] According to the magnetic force traction type bone lengthening device of the present invention, a plurality of electromagnetic blocks located at the same end of the collar are evenly distributed along the axial direction of the collar, and a plurality of electromagnetic blocks on the same collar all face the bone fixing block corresponding to this collar.

[0016] According to the magnetic force traction type bone lengthening device of the present invention, a positioning cylinder is provided between the collar rotatably connected to the driving rod and the driving rod. The positioning cylinder is rotatably connected to the collar and sleeved outside the driving rod.

[0017] According to the magnetic force traction type bone lengthening device of the present invention, a plurality of axially evenly distributed hollow grooves are provided on the collar.

[0018] The purpose of the present invention is to provide a magnetic force traction type bone lengthening device, including an internal part arranged inside the patient's limb and an external part arranged outside the patient's limb. By using the attraction between the electromagnetic block and the bone fixing block to position and move the broken bone, it can assist the normal growth of the patient's limb while simplifying the operation steps during single adjustment and reducing the operation time during single adjustment; after single adjustment is completed, all structures of the external part can be removed, avoiding forming too many wounds on the patient's limb, reducing the risk of infection, and simplifying the structure placed inside the patient's limb to improve the comfort of the patient. In summary, the beneficial effects of the present invention are: it can assist the normal growth of the patient's limb while simplifying the operation steps during single adjustment, reducing the operation time during single adjustment, avoiding forming too many wounds on the patient's limb, reducing the risk of infection, and simplifying the structure placed inside the patient's limb to improve the comfort of the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the structural diagram of the present invention; Figure 2 is the structural diagram at the intramedullary nail; Figure 3 is the structural diagram at the card slot; Figure 4 is the structural diagram at the driving rod; Figure 5 is the sectional view at the clamping block; Figure 6 is the sectional view at the connecting inner rod; In the figure: 1 - internal part, 11 - intramedullary nail, 111 - card slot, 12 - bone fixing block, 121 - elastic piece, 122 - clamping block, 13 - bone connecting piece, 2 - external part, 21 - collar, 211 - half collar, 212 - hollow groove, 22 - electromagnetic block, 23 - driving rod, 231 - positioning cylinder, 3 - half collar connecting piece, 31 - connecting sleeve rod, 32 - connecting inner rod, 33 - locking piece, 4 - fixed head, 5 - elastic piece. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "provided with", "sheathed / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection, can be a mechanical connection, can be an electrical connection, can be directly connected, or can be indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0023] See Figures 1 to 5 , the present invention provides a magnetic traction bone lengthening device, including an internal part 1 arranged inside the patient's limb and an external part 2 arranged outside the patient's limb. The internal part 1 includes an intramedullary nail 11 implanted inside the patient's fractured bone. The intramedullary nail 11 is an internal fixation instrument for treating fractures of long bones (such as femur, tibia, humerus, etc.). By implanting it into the medullary cavity of the patient's fractured bone, the fracture ends are stabilized. There are at least two magnetic bone fixation blocks 12 (i.e., structures made of materials that can maintain magnetism for a long time without external magnetic field or current excitation) provided on the intramedullary nail 11. The bone fixation blocks 12 are all sleeved outside the intramedullary nail 11, and the bone fixation blocks 12 can slide on the intramedullary nail 11. The bone fixation blocks 12 are connected to the patient's fractured bone through bone connectors 13. When the bone fixation blocks 12 move, the bone fixation blocks 12 can drive the patient's fractured bone to move. Elastic blocks 122 are elastically connected inside the bone fixation blocks 12 (symmetric sliders are provided on the blocks 122 inside the bone fixation blocks 12, chutes are provided inside the bone fixation blocks 12 to cooperate with the sliders, the sliders are all slidably arranged in the chutes, and elastic pieces 121 are provided between the blocks 122 and the bone fixation blocks 12. One end of the block 122 away from the elastic piece 121 is provided with a protrusion, and the protrusion penetrates through the bone fixation block 12). A number of slots 111 cooperating with the blocks 122 are provided on the intramedullary nail 11; when the blocks 122 cooperate with the slots 111, the positions of the bone fixation blocks 12 can be fixed.

[0024] See Figures 1 to 5 , specifically, the bone connector 13 is a bone fixation needle, which is convenient for connecting the bone fixation block 12 to the patient's fractured bone.

[0025] See Figures 1 to 5, the external part 2 includes at least two collars 21 sleeved outside the patient's limb and cooperating with the bone fixing block 12. A number of electromagnetic blocks 22 cooperating with the bone fixing block 12 are symmetrically arranged on each collar 21. A number of electromagnetic blocks 22 at the same end of the collar 21 are evenly distributed along the axial direction of the collar 21, and a number of electromagnetic blocks 22 on the same collar 21 all face the bone fixing block 12 corresponding to this collar 21 (the user can adjust the orientation of the electromagnetic blocks 22 on the same collar 21 according to the thickness of the collar 21 to make them face directly the bone fixing block 12 corresponding to this collar 21, so as to ensure that the attraction force generated after power-on can directly act on the bone fixing block 12). A coil is provided inside the electromagnetic block 22. After the electromagnetic block 22 is powered on, the user can control the magnetic force of the electromagnetic block 22 through the current to achieve adsorption, locking or braking. After the electromagnetic block 22 is powered on, a number of electromagnetic blocks 22 at the same end of the collar 21 can all generate an attraction force on the bone fixing block 12, forming a tensile surface with the same tensile force in all directions between the electromagnetic block 22 and the bone fixing block 12. When the collar 21 moves, a number of electromagnetic blocks 22 can use the attraction force to pull the bone fixing block 12 to move (for the use of the cooperation between the electromagnet and the permanent magnet, it is a mature prior art in this field, and its specific structure and working principle will not be elaborated here). Driving rods 23 are symmetrically inserted through between a number of collars 21. One of the collars 21 is threadedly connected to the driving rod 23, and the remaining collars 21 are all rotatably connected to the driving rod 23. After the positions of a number of collars 21 are fixed, rotate the two driving rods 23 (if it is necessary to save labor and facilitate the synchronous rotation of the two driving rods 23, the rotation of the driving rod 23 can be controlled by a rotating motor). The synchronous rotation of the two driving rods 23 causes the collar 21 threadedly connected to the driving rod 23 to traction the broken bone of the patient to move along the direction of the intramedullary nail 11, so as to adjust the distance between the broken bones and facilitate the growth of the broken bone of the patient.

[0026] See Figures 1 to 5 , preferably, a number of axially evenly distributed hollow grooves 212 are provided on each collar 21, which can not only facilitate the installation of the user, but also reduce the weight, reduce the burden on the patient and save the manufacturing cost.

[0027] See Figures 1 to 5 , specifically, a positioning cylinder 231 is provided between the collar 21 rotatably connected to the driving rod 23 and the driving rod 23. The positioning cylinder 231 is rotatably connected to the collar 21 and sleeved outside the driving rod 23 to improve the stability between the collar 21 and the driving rod 23.

[0028] See Figures 1 to 6, Further, for easy disassembly, the collar 21 includes two symmetrically arranged half-rings 211, and the two half-rings 211 are connected by a number of half-ring connectors 3. Each half-ring connector 3 includes a connecting sleeve rod 31 and a connecting inner rod 32 that are elastically connected to the two half-rings 211 respectively (insert blocks are symmetrically provided on the connecting sleeve rod 31 inside the half-ring 211, slots that cooperate with the insert blocks are provided inside the half-ring 211, the insert blocks are slidably arranged in the slots, and elastic members 5 are provided between the insert blocks and the slots. The connection principle of the connecting inner rod 32 is the same as that of the connecting sleeve rod 31 and will not be elaborated here). An avoidance groove that cooperates with the connecting inner rod 32 is provided on the connecting sleeve rod 31, and a number of locking members 33 are elastically connected to both the connecting sleeve rod 31 and the connecting inner rod 32 (the connection method between the locking member 33 and the connecting sleeve rod 31 or the connecting inner rod 32 is the same as the connection method between the connecting sleeve rod 31 and the half-ring 211). A locking hole that cooperates with the locking member 33 on the connecting sleeve rod 31 is provided on the half-ring 211 where the connecting inner rod 32 is located, and a locking hole that cooperates with the locking member 33 on the connecting inner rod 32 is provided in the avoidance groove of the connecting sleeve rod 31; when the connecting sleeve rod 31 and the connecting inner rod 32 are pushed towards each other, when all the locking members 33 cooperate with their corresponding locking holes, the positions of the connecting sleeve rod 31 and the connecting inner rod 32 are locked, thereby fixing the two half-rings 211.

[0029] See Figures 1 to 6 , Preferably, the elastic member 5 is a spring, which provides a return power.

[0030] See Figures 1 to 6 , Preferably, fixed heads 4 are provided at one end of the connecting sleeve rod 31 away from the connecting inner rod 32 and at one end of the connecting inner rod 32 away from the connecting sleeve rod 31, which is convenient for the user to pull the connecting sleeve rod 31 and the connecting inner rod 32.

[0031] See Figures 1 to 6 , Preferably, during use, all structures that will interfere with the magnetic force cooperation between the electromagnetic block 22 and the bone fixing block 12 should be made of materials without magnetic conductivity to reduce interference.

[0032] See Figures 1 to 6, when performing bone transport treatment (it is necessary to divide the affected part of the patient into three segments), according to the distance required for the treatment of the patient's affected part, select a driving rod 23 and an intramedullary nail 11 of appropriate length, set three collar rings 21, and make the collar rings 21 at both ends rotatably connected to the driving rod 23 (that is, these two collar rings 21 cannot move on the driving rod 23), and one collar ring 21 in the middle is threadedly connected to the driving rod 23. Insert the intramedullary nail 11 into the marrow cavity of the patient's fractured bone, and make the bone fixing blocks 12 cooperating with the collar rings 21 at both ends be respectively fixed to the fractured bones at both ends of the patient, and the bone fixing block 12 cooperating with the collar ring 21 in the middle is fixed to the transected bone segment of the patient. During the first adjustment, after sleeving the collar rings 21 at both ends outside the patient's limb (for the convenience of positioning the collar rings 21 next time, marks can also be made at the corresponding positions of the patient's limb, such as smearing marks on the patient's skin surface with a waterproof marker pen or using a strap for marking), the electromagnets 22 on them can be energized, and positioning is carried out by using the attraction force between the electromagnets 22 and the bone fixing blocks 12. Then rotate the driving rod 23 to finely adjust the position of the collar ring 21 in the middle so that it corresponds to the bone fixing block 12 fixed to the transected bone segment of the patient, that is, the first positioning is completed. After the positioning is completed, all the structures of the external part 2 can be removed. When performing a single adjustment, according to the marks on the patient's limb, connect the external part 2, energize the electromagnets 22 on the collar rings 21 at both ends, and perform positioning by using the attraction force between the electromagnets 22 and the bone fixing blocks 12 (even if the installation position is slightly deviated, the position of the collar rings 21 at both ends can be corrected by the attraction force between the electromagnets 22 and the bone fixing blocks 12. In order to completely avoid the offset of the bone fixing blocks 12 at both ends due to accidental factors, the internal structures of the bone fixing blocks 12 at both ends can also be removed, and the bone fixing blocks 12 at both ends can be completely fixed to the intramedullary nail 11), and then energize the electromagnets 22 on the collar ring 21 in the middle. According to the requirements, rotate the driving rod 23, and drive the bone fixing block 12 fixed to the transected bone segment of the patient to move by moving the collar ring 21 in the middle. At this time, the locking block 122 presses the elastic piece 121. When moving to an appropriate distance, the locking block 122 cooperates with the card slot 111, thereby fixing the position of the transected bone segment of the patient. By moving the bone segment multiple times, stimulate the growth of new bone tissue in the gap between the fractured bones on both sides of the patient, and finally realize the repair of bone defect or the lengthening of the limb.

[0033] See Figures 1 to 6, when performing bone lengthening treatment (where the affected part of the patient needs to be divided into two sections), two collar rings 21 are provided (one collar ring 21 is rotatably connected to the drive rod 23, and the other collar ring 21 is threadedly connected to the drive rod 23). That is, one collar ring 21 is used to position on the patient's limb, and the other collar ring 21 is used to move the bone fixation block 12 to achieve the movement of the patient's fractured bone. Except for the different number of collar rings 21 and different treatment principles, the rest of the operations are the same as those during the above-mentioned bone transport treatment and will not be elaborated here.

[0034] The present invention provides a magnetic traction bone lengthening device, which includes an internal part disposed inside the patient's limb and an external part disposed outside the patient's limb. By using the attraction between the electromagnetic block and the bone fixation block to position and move the fractured bone, it can assist the normal growth of the patient's limb while simplifying the operation steps during single adjustment and reducing the operation time during single adjustment; after single adjustment is completed, all the structures of the external part can be removed, avoiding forming too many wounds on the patient's limb, reducing the risk of infection, and simplifying the structure placed inside the patient's limb to improve the comfort of the patient. In summary, the beneficial effects of the present invention are: it can assist the normal growth of the patient's limb while simplifying the operation steps during single adjustment, reducing the operation time during single adjustment, avoiding forming too many wounds on the patient's limb, reducing the risk of infection, and simplifying the structure placed inside the patient's limb to improve the comfort of the patient.

[0035] Certainly, the present invention can also have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present invention.

Claims

1. A magnetic traction bone lengthening device, characterized in that, It includes an internal part disposed inside the patient's limb and an external part disposed outside the patient's limb. The internal part includes an intramedullary nail inserted into the bone marrow cavity at the fracture site of the patient. At least two magnetic bone fixation blocks are provided on the intramedullary nail. Elastic blocks are connected inside each of the bone fixation blocks, and a number of slots cooperating with the blocks are provided on the intramedullary nail. The external part includes at least two collars sleeved outside the patient's limb and cooperating with the bone fixation blocks. A number of electromagnetic blocks cooperating with the bone fixation blocks are symmetrically provided on each collar, and one of the collars can move along the direction of the intramedullary nail.

2. The magnetic traction bone lengthening device according to claim 1, wherein Drive rods are symmetrically inserted between a number of collars. One of the collars is threadedly connected to the drive rod, and the remaining collars are rotatably connected to the drive rod.

3. The magnetic traction bone lengthening device according to claim 1, characterized in that, Each of the collars includes two symmetrically arranged half-rings, and the two half-rings are connected by a number of half-ring connectors.

4. The magnetic traction bone lengthening device according to claim 3, wherein, Each of the half-ring connectors includes a connecting sleeve rod and a connecting inner rod respectively elastically connected to the two half-rings. An avoidance groove cooperating with the connecting inner rod is provided on the connecting sleeve rod. A number of locking members are elastically connected to both the connecting sleeve rod and the connecting inner rod. A locking hole cooperating with the locking member on the connecting sleeve rod is provided on the half-ring where the connecting inner rod is located, and a locking hole cooperating with the locking member on the connecting inner rod is provided in the avoidance groove of the connecting sleeve rod.

5. The magnetic traction bone lengthening device according to claim 4, characterized in that Plug blocks are symmetrically provided on the connecting sleeve rods inside the half-rings. Slots cooperating with the plug blocks are provided inside the half-rings. The plug blocks are slidably arranged in the slots, and elastic members are provided between the plug blocks and the slots.

6. The magnetic traction bone lengthening device according to claim 4, characterized in that Fixed heads are provided at one ends of the connecting sleeve rod away from the connecting inner rod and the connecting inner rod away from the connecting sleeve rod.

7. The magnetic traction bone lengthening device according to claim 1, characterized in that Sliders are symmetrically provided on the blocks inside the bone fixation blocks. Sliding grooves cooperating with the sliders are provided inside the bone fixation blocks. The sliders are slidably arranged in the sliding grooves, and a spring piece is provided between the block and the bone fixation block. A protrusion is provided at one end of the block away from the spring piece, and the protrusion penetrates through the bone fixation block.

8. The magnetic traction bone lengthening device according to claim 1, characterized in that, A number of electromagnetic blocks at the same end of the collar are evenly distributed along the axial direction of the collar, and a number of electromagnetic blocks on the same collar all face the corresponding bone fixation block.

9. The magnetic traction bone lengthening device according to claim 2, wherein, A positioning cylinder is provided between the collar rotatably connected to the drive rod and the drive rod. The positioning cylinder is rotatably connected to the collar and sleeved outside the drive rod.

10. The magnetic traction bone lengthening device according to claim 1, characterized in that, A number of hollow slots evenly distributed along the axial direction are provided on each collar.

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