A magnetic traction bone lengthening device

Abstract

The present invention relates to the technical field of bone lengthening devices, and more particularly to a magnetic traction bone lengthening device comprising an internal portion disposed within a patient's limb and an external portion disposed externally of the patient's limb. The internal portion comprises an intrabone nail inserted into the medullary cavity of the patient's broken bone, the intrabone nail being provided with at least two magnetic bone fixation blocks, each elastically connected to a retaining block within the fixation blocks, and the intrabone nail being provided with a plurality of retaining slots for engaging the retaining blocks. The external portion comprises at least two rings disposed externally of the patient's limb, each symmetrically provided with a plurality of electromagnetic blocks that interact with the fixation blocks, with one of the rings being movable in the direction of the intrabone nail. Thus, the present invention can assist in the normal growth of the patient's limb while simplifying the steps and time required for a single adjustment, reducing the risk of infection, simplifying the structure inserted into the patient's limb, and improving patient comfort.

Description

Technical Field

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

[0002] Limb lengthening and bone deformity correction surgery are common surgeries, mainly used to treat congenital or acquired limb length discrepancy, pathological dwarfism and other conditions. Bone lengthening is also called distraction osteogenesis, which means cutting the bone while preserving the soft tissue and blood supply. A special traction device is used to fix the two ends. The tensile stress law is used to gradually apply tension to slowly pull the bone segments, continuously stimulating the body tissue, stimulating the regenerative potential of human tissue, and forming new bone in the osteotomy gap to achieve the purpose of bone regeneration.

[0003] Currently, existing bone lengthening devices, such as Chinese patent publication number CN118557267A, disclose a magnetically driven bone lengthening device, comprising: a magnetic drive device including a rotating shaft and a magnetic drive member mounted on the rotating shaft; a transmission device including a reducer connected to the output end of the rotating shaft and a transmission shaft connected to the output end of the reducer; an extension rod having one end connected to the output end of the transmission shaft and the other end extending from a housing of the magnetically driven bone lengthening device; and at least two sets of positioning holes provided in the housing. Each of the at least two sets of positioning holes is provided with a corresponding positioning bolt for attaching the magnetically driven bone lengthening device to the bone surface for fixation. The magnetic drive member is driven to rotate by a magnetic field generated by an external electromagnetic driver. The rotational motion of the magnetic drive member is sequentially transmitted through the magnetic drive device and the transmission device to cause the extension rod to extend or retract axially. However, when the above device is used, the structure located inside the patient's limb is complex, which not only increases the manufacturing cost but also increases the patient's discomfort.

[0004] How to assist the normal growth of the patient's limbs while simplifying the operating steps for a single adjustment, reducing the operation time for a single adjustment, avoiding excessive wounds on the patient's limbs, reducing the risk of infection, and simplifying the structure inserted into the patient's limbs to improve the patient's comfort has become a technical problem that needs to be broken through.

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

[0006] In response to the above-mentioned 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 limbs while simplifying the operating steps during a single adjustment, reducing the operation time during a single adjustment, avoiding the formation of excessive wounds on the patient's limbs, reducing the risk of infection, and simplifying the structure inserted into the patient's limbs to improve the patient's comfort.

[0007] In order to achieve the above-mentioned objectives, the present invention provides a magnetic traction bone lengthening device, comprising an internal portion arranged inside a patient's limb and an external portion arranged outside the patient's limb, the internal portion comprising an intrabone nail inserted into the medullary cavity of the patient's broken bone, the intrabone nail being provided with at least two magnetic bone fixation blocks, the interiors of the bone fixation blocks being elastically connected to clamping blocks, and the intrabone nail being provided with a plurality of clamping slots that cooperate with the clamping blocks.

[0008] The external part includes at least two rings which are sleeved on the outside of the patient's limb and matched with the bone fixation block. The rings are symmetrically provided with a number of electromagnetic blocks which match with the bone fixation block, and one of the rings can move along the direction of the bone nail.

[0009] According to the magnetic traction bone lengthening device of the present invention, driving rods are symmetrically provided between the plurality of collars, one of the collars is threadedly connected to the driving rod, and the remaining collars are rotatably connected to the driving rod.

[0010] According to the magnetic traction bone lengthening device of the present invention, the sleeve ring includes two symmetrically arranged half rings, and the two half rings are connected by a plurality of half ring connectors.

[0011] According to the magnetic traction bone lengthening device of the present invention, the semi-ring connecting parts include a connecting sleeve rod and a connecting inner rod elastically connected to the two semi-rings respectively, the connecting sleeve rod is provided with an avoidance groove that cooperates with the connecting inner rod, and the connecting sleeve rod and the connecting inner rod are elastically connected with a plurality of locking parts, the semi-ring where the connecting inner rod is located is provided with a locking hole that cooperates with the locking part on the connecting sleeve rod, and the avoidance groove of the connecting sleeve rod is provided with a locking hole that cooperates with the locking part on the connecting inner rod.

[0012] According to the magnetic traction bone lengthening device of the present invention, plug blocks are symmetrically provided on the connecting sleeve rod inside the semi-ring, slots cooperating with the plug blocks are provided inside the semi-ring, the plug blocks are slidably set in the slots, and elastic parts are provided between the plug blocks and the slots.

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

[0014] According to the magnetic traction bone lengthening device of the present invention, sliders are symmetrically provided on the clamping block inside the bone fixation block, and a sliding groove cooperating with the slider is provided inside the bone fixation block. The sliders are slidably set in the sliding groove, and a spring sheet is provided between the clamping block and the bone fixation block. A protrusion is provided at the end of the clamping block away from the spring sheet, and the protrusion passes through the bone fixation block.

[0015] According to the magnetic traction bone lengthening device of the present invention, the electromagnetic blocks at the same end of the collar are evenly distributed along the collar's axis, and the electromagnetic blocks on the same collar all face the bone fixation block corresponding to the collar.

[0016] According to the magnetic traction 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 traction bone lengthening device of the present invention, the collar is provided with a plurality of hollow grooves evenly distributed along the axial direction.

[0018] The purpose of the present invention is to provide a magnetic traction bone lengthening device, comprising an internal part arranged inside the patient's limb and an external part arranged outside the patient's limb, which uses the attraction between the electromagnetic block and the bone fixation block to locate and move the broken bone, and can assist the normal growth of the patient's limb while simplifying the operating steps during a single adjustment and reducing the operating time during a single adjustment; after a single adjustment is completed, all structures of the external part can be removed to avoid forming too many wounds on the patient's limb, reduce the risk of infection, and simplify the structure inserted into the patient's limb to improve the patient's comfort. In summary, the beneficial effects of the present invention are: it can assist the normal growth of the patient's limb while simplifying the operating steps during a single adjustment and reducing the operating time during a single adjustment, avoid forming too many wounds on the patient's limb, reduce the risk of infection, and simplify the structure inserted into the patient's limb to improve the patient's comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the present invention; Figure 2 This is a structural diagram of the intrabone nail site; Figure 3 It is a structural diagram of the card slot; Figure 4 It is the structural diagram of the driving rod; Figure 5 It is a cross-sectional view of the block; Figure 6 It is a cross-sectional view of the connection between the inner rod and the bone; in the figure: 1-internal part, 11-intrabone nail, 111-slot, 12-bone fixation block, 121-spring clip, 122-block, 13-bone connector, 2-external part, 21-ring, 211-semi-ring, 212-hollow groove, 22-electromagnetic block, 23-driving rod, 231-positioning cylinder, 3-semi-ring connector, 31-connecting sleeve rod, 32-connecting inner rod, 33-locking member, 4-fixing head, 5-elastic member. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, 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 intended to limit the present invention.

[0021] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "sleeved / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] See also Figures 1 to 5 The present invention provides a magnetic traction bone lengthening device, comprising 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 comprises an intrabone nail 11 inserted into the patient's broken bone, the intrabone nail 11 is an internal fixation device for treating fractures of long bones (such as femur, tibia, humerus, etc.), and is inserted into the medullary cavity of the patient's broken bone to stabilize the fracture end, the intrabone nail 11 is provided with at least two magnetic bone fixation blocks 12 (i.e., a structure made of a material that can maintain magnetism for a long time without the need for external magnetic field or current excitation), the bone fixation blocks 12 are all sleeved on the outside of the intrabone nail 11, and the bone fixation blocks 12 can slide on the intrabone nail 11, and the bone fixation blocks 12 pass through the bone The connecting piece 13 is connected to the broken bone of the patient. When the bone fixing block 12 moves, the bone fixing block 12 can drive the broken bone of the patient to move. The interior of the bone fixing block 12 is elastically connected with a card block 122 (sliders are symmetrically provided on the card block 122 inside the bone fixing block 12, and a slide groove cooperating with the slide is provided inside the bone fixing block 12. The slides are slidably set in the slide groove, and a spring piece 121 is provided between the card block 122 and the bone fixing block 12. A protrusion is provided at the end of the card block 122 away from the spring piece 121, and the protrusion passes through the bone fixing block 12). The bone nail 11 is provided with a plurality of card grooves 111 cooperating with the card block 122; when the card block 122 and the card groove 111 cooperate with each other, the position of the bone fixing block 12 can be fixed.

[0024] See also Figures 1 to 5 Specifically, the bone connector 13 is a bone fixation pin, which facilitates connecting the bone fixation block 12 to the patient's broken bone.

[0025] See also Figures 1 to 5The external part 2 includes at least two rings 21 that are sleeved on the outside of the patient's limb and cooperate with the bone fixation block 12. The rings 21 are symmetrically provided with a plurality of electromagnetic blocks 22 that cooperate with the bone fixation block 12. The plurality of electromagnetic blocks 22 located at the same end of the ring 21 are evenly distributed along the axial direction of the ring 21, and the plurality of electromagnetic blocks 22 on the same ring 21 are all facing the bone fixation block 12 corresponding to the ring 21 (the user can adjust the direction of the electromagnetic block 22 on the same ring 21 according to the thickness of the ring 21 so that it is facing the bone fixation block 12 corresponding to the ring 21, thereby ensuring that the attraction generated after it is energized can directly act on the bone fixation block 12). A coil is provided inside the electromagnetic block 22. After the electromagnetic block 22 is energized, 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 energized, the plurality of electromagnetic blocks 22 located at the same end of the ring 21 can generate an attraction on the bone fixation block 12 The attraction forms a tension surface with the same pulling force in all directions between the electromagnetic block 22 and the bone fixation block 12. When the ring 21 moves, the multiple electromagnetic blocks 22 can use the attraction to pull the bone fixation block 12 to move (the use of electromagnets and permanent magnets in cooperation with each other is a mature existing technology in this field, and its specific structure and working principle will not be repeated here). The multiple rings 21 are symmetrically penetrated by driving rods 23, one of the rings 21 is threadedly connected to the driving rod 23, and the remaining rings 21 are rotatably connected to the driving rod 23. After the positions of the multiple rings 21 are fixed, the two driving rods 23 are rotated (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 rotary motor). The synchronous rotation of the two driving rods 23 causes the rings 21 threadedly connected to the driving rod 23 to pull the patient's broken bone to move along the direction of the intrabone nail 11, thereby adjusting the distance between the broken bones and facilitating the growth of the patient's broken bones.

[0026] See also Figures 1 to 5 Preferably, the collar 21 is provided with a plurality of hollow grooves 212 evenly distributed along the axial direction, which can facilitate installation by the user, reduce weight, alleviate the burden on the patient, and save production costs.

[0027] See also 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 the positioning cylinder 231 is sleeved on the outside of the driving rod 23 to improve the stability between the collar 21 and the driving rod 23.

[0028] See also Figures 1 to 6, further, to facilitate 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, and the half ring connectors 3 include a connecting rod 31 and a connecting inner rod 32 elastically connected to the two half rings 211 respectively (the connecting rod 31 inside the half ring 211 is symmetrically provided with plug blocks, and the interior of the half ring 211 is provided with slots that cooperate with the plug blocks. The plug blocks are slidably arranged in the slots, and elastic members 5 are provided between the plug blocks and the slots. The connection principle of the connecting inner rod 32 is the same as that of the connecting rod 31, which will not be repeated here), the connecting rod 31 is provided with an avoidance groove that cooperates with the connecting inner rod 32, and the connecting rod 31 is provided with a groove. A plurality of locking members 33 are elastically connected to the connecting inner rod 32 (the connection method between the locking members 33 and the connecting sleeve rod 31 or the connecting inner rod 32 is similar to the connection method between the connecting sleeve rod 31 and the half ring 211). The half ring 211 where the connecting inner rod 32 is located is provided with a locking hole that cooperates with the locking members 33 on the connecting sleeve rod 31, and the avoidance groove of the connecting sleeve rod 31 is provided with a locking hole that cooperates with the locking members 33 on the connecting inner rod 32; at the same time, when the connecting sleeve rod 31 and the connecting inner rod 32 are pushed toward 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 also Figures 1 to 6 Preferably, the elastic member 5 is a spring to provide return power.

[0030] See also Figures 1 to 6 Preferably, the end of the connecting sleeve rod 31 away from the connecting inner rod 32 and the end of the connecting inner rod 32 away from the connecting sleeve rod 31 are both provided with a fixing head 4, which makes it convenient for the user to pull the connecting sleeve rod 31 and the connecting inner rod 32.

[0031] See also Figures 1 to 6 Preferably, when in use, all structures that will interfere with the magnetic cooperation between the electromagnetic block 22 and the bone fixation block 12 should be made of materials that have no magnetic conductivity to reduce interference.

[0032] See also Figures 1 to 6When performing bone transport treatment (the patient's affected part needs to be divided into three sections), according to the distance required for the treatment of the patient's affected part, a driving rod 23 and an intrabone nail 11 of appropriate length are selected, and three rings 21 are set, so that the rings 21 at both ends are rotatably connected to the driving rod 23 (that is, these two rings 21 cannot move on the driving rod 23), and a ring 21 in the middle is threadedly connected to the driving rod 23, and the intrabone nail 11 is inserted into the medullary cavity of the patient's broken bone, so that the bone fixing blocks 12 cooperating with the rings 21 at both ends are respectively fixed to the broken bones at both ends of the patient, and the bone fixing blocks 12 cooperating with the ring 21 in the middle are respectively fixed to the broken bones at both ends of the patient. The fixing block 12 is fixed on the patient's severed bone segment. During the first adjustment, the rings 21 at both ends are placed on the outside of the patient's limb (to facilitate the next positioning of the rings 21, the corresponding positions of the patient's limb can also be marked, for example, by applying marks on the patient's skin surface with a waterproof marker, or by using a bandage). Then, the electromagnetic block 22 on it can be energized, and the attraction between the electromagnetic block 22 and the bone fixing block 12 is used to position it. Then, the driving rod 23 is rotated to fine-tune the position of the ring 21 in the middle so that it corresponds to the bone fixing block 12 fixed on the patient's severed bone segment. 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, the external part 2 is connected according to the mark on the patient's limb, and the electromagnetic blocks 22 on the rings 21 at both ends are energized. The attraction between the electromagnetic blocks 22 and the bone fixation block 12 is used to position the rings 21 at both ends (even if the installation position is slightly deviated, the attraction between the electromagnetic blocks 22 and the bone fixation block 12 can be used to correct the position of the rings 21 at both ends. In order to completely avoid the bone fixation blocks 12 at both ends from being offset due to unexpected factors, the internal structures of the bone fixation blocks 12 at both ends can also be removed. The bone fixation blocks 12 at both ends are completely fixed to the bone nail 11), and then the electromagnetic block 22 on the central collar 21 is energized. As needed, the driving rod 23 is rotated to move the central collar 21, thereby driving the bone fixation block 12 fixed to the patient's severed bone segment to move. At this time, the clamping block 122 squeezes the spring piece 121. When it moves to the appropriate distance, the clamping block 122 cooperates with the clamping groove 111 to fix the position of the patient's severed bone segment. By repeatedly moving the bone segments, new bone tissue is stimulated to grow in the gap between the broken bones on both sides of the patient, ultimately achieving bone defect repair or limb lengthening.

[0033] See also Figures 1 to 6When performing bone lengthening treatment (the patient's affected part needs to be divided into two sections), two rings 21 are set (one ring 21 is rotatably connected to the driving rod 23, and the other ring 21 is threadedly connected to the driving rod 23). That is, one ring 21 is used to position the patient's limb, and the other ring 21 is used to move the bone fixing block 12 to achieve the movement of the patient's broken bone. Except for the different number of rings 21 and the different treatment principles, the rest of the operations are the same as those in the above-mentioned bone transport treatment and will not be repeated here.

[0034] The present invention provides a magnetic traction bone lengthening device, comprising an internal part arranged inside the patient's limb and an external part arranged outside the patient's limb. The device uses the attraction between the electromagnetic block and the bone fixation block to locate and move the broken bone, which can assist the normal growth of the patient's limb while simplifying the operating steps during a single adjustment and reducing the operating time during a single adjustment. After a single adjustment is completed, all structures of the external part can be removed to avoid forming too many wounds on the patient's limb, reduce the risk of infection, and simplify the structure inserted into the patient's limb to improve the patient's comfort. In summary, the beneficial effects of the present invention are: it can assist the normal growth of the patient's limb while simplifying the operating steps during a single adjustment and reducing the operating time during a single adjustment, avoid forming too many wounds on the patient's limb, reduce the risk of infection, and simplify the structure inserted into the patient's limb to improve the patient's comfort.

[0035] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A magnetic traction bone lengthening device, characterized in that: The device comprises an internal portion disposed inside a patient's limb and an external portion disposed outside the patient's limb, the internal portion comprising an intrabone nail inserted into the medullary cavity of the patient's broken bone, the intrabone nail being provided with at least two magnetic bone fixation blocks, the interiors of the bone fixation blocks being elastically connected to clamping blocks, and the intrabone nail being provided with a plurality of clamping slots that cooperate with the clamping blocks; The external part includes at least two rings that are sleeved on the outside of the patient's limb and cooperate with the bone fixation block. The rings are symmetrically provided with a plurality of electromagnetic blocks that cooperate with the bone fixation block, and one of the rings can move along the direction of the bone nail; During the first adjustment, the collar is placed on the outside of the patient's limb and positioned using the attraction between the electromagnetic block and the bone fixation block. After positioning is completed, the external part is removed. During a single adjustment, the external part is connected and positioned using the attraction between the electromagnetic block and the bone fixation block. By moving the collar, the bone fixation block fixed on the patient's severed bone segment is driven to move.

2. The magnetic traction bone lengthening device according to claim 1, characterized in that: Driving rods are symmetrically provided between the plurality of collars, one of the collars is threadedly connected to the driving rod, and the remaining collars are rotatably connected to the driving rod.

3. The magnetic traction bone lengthening device according to claim 1, characterized in that: The sleeve rings each include two symmetrically arranged half rings, and the two half rings are connected by a plurality of half ring connectors.

4. The magnetic traction bone lengthening device according to claim 3, characterized in that: The semi-ring connecting parts each include a connecting sleeve rod and a connecting inner rod elastically connected to the two semi-rings respectively, the connecting sleeve rod is provided with an avoidance groove that cooperates with the connecting inner rod, and a number of locking parts are elastically connected to the connecting sleeve rod and the connecting inner rod, the semi-ring where the connecting inner rod is located is provided with a locking hole that cooperates with the locking part on the connecting sleeve rod, and the avoidance groove of the connecting sleeve rod is provided with a locking hole that cooperates with the locking part on the connecting inner rod.

5. The magnetic traction bone lengthening device according to claim 4, characterized in that: Insert blocks are symmetrically provided on the connecting sleeve rod inside the semi-ring, and slots cooperating with the insert blocks are provided inside the semi-ring. The insert blocks are slidably arranged in the slots, and elastic members are provided between the insert blocks and the slots.

6. The magnetic traction bone lengthening device according to claim 4, characterized in that: The end of the connecting sleeve rod away from the connecting inner rod and the end of the connecting inner rod away from the connecting sleeve rod are both provided with fixing heads.

7. The magnetic traction bone lengthening device according to claim 1, characterized in that: Sliders are symmetrically provided on the card block inside the bone fixation block, and a sliding groove cooperating with the slider is provided inside the bone fixation block. The sliders are slidably set in the sliding groove, and a spring sheet is provided between the card block and the bone fixation block. A protrusion is provided at one end of the card block away from the spring sheet, and the protrusion passes through the bone fixation block.

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

9. The magnetic traction bone lengthening device according to claim 2, characterized in that: 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 is sleeved on the outside of the driving rod.

10. The magnetic traction bone lengthening device according to claim 1, characterized in that: The collar is provided with a plurality of hollow grooves evenly distributed along the axial direction.

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