An implantable bone lengthening intramedullary nail

Abstract

The utility model relates to intramedullary nail technical field, especially place formula bone lengthening intramedullary nail, including fixed part and moving part, the inside of fixed part is equipped with accommodating cavity, is equipped with with the in-vivo driven element of in-vitro driving element cooperation use in accommodating cavity, in-vivo driven element is connected transmission rod to one end of moving part close, transmission rod one side close moving part is equipped with at least one speed reducer assembly, speed reducer assembly includes the rotation cylinder of screw connection in the inner wall of accommodating cavity, transmission rod one end is connected drive gear and penetrates into the rotation cylinder inside, drive gear engages several driven gears with the diameter greater than drive gear, the inner tooth ring that is equipped with with driven gear cooperation on the inner wall of rotation cylinder, rotation cylinder is connected in moving part to one end rotation far from in-vivo driven element. By this, the utility model can reduce the wound area on the patient's limbs under the premise of promoting the normal growth of the patient's broken bone, and the operation is simple, convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of intramedullary nail technology, and in particular to an implantable bone lengthening intramedullary nail. Background Technology

[0002] Limb lengthening and bone deformity correction surgery are common procedures, mainly used to treat congenital or acquired limb length discrepancies, pathological short stature, and other conditions. Bone lengthening, also known as distraction osteogenesis, involves cutting the bone while preserving soft tissue and blood supply. A specially designed traction device is used to fix both ends, and the tensile stress principle is applied to gradually pull the bone segment slowly, continuously stimulating the body's tissues and activating the body's tissue regeneration potential, so that new bone can form in the osteotomy gap, thus achieving the purpose of bone regeneration.

[0003] Currently, existing bone lengthening devices, such as Chinese Patent Publication No. CN118557267A, disclose a magnetically driven bone lengthening device, including a magnetic drive device comprising a rotating shaft and a magnetic drive component sleeved on the rotating shaft, a transmission device comprising 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 the outer shell of the magnetically driven bone lengthening device, and the outer shell having at least two sets of positioning holes disposed on the outer shell, each of the at least two sets of positioning holes being provided with a positioning pin for fixing the magnetically driven bone lengthening device to the bone surface. The magnetic drive component is driven to rotate by a magnetic field generated by an external electromagnetic actuator, and the rotational movement of the magnetic drive component is sequentially passed through the magnetic drive device and the transmission device to cause the extension rod to extend or retract axially. However, the above-mentioned device has a complex structure, high manufacturing cost, and difficult installation, and in actual use, it causes a large wound area to the patient.

[0004] How to reduce the wound area on the patient's limb while promoting normal bone growth, and how to do this in a simple and convenient way, has become a technical problem that needs to be solved.

[0005] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0006] To address the aforementioned shortcomings, the purpose of this invention is to provide an implantable bone lengthening intramedullary nail that can reduce the wound area on the patient's limb while promoting normal bone growth at the fracture site. Furthermore, it is simple to operate and convenient to use.

[0007] To achieve the above objectives, this utility model provides an implantable bone lengthening intramedullary nail, including a fixing part and a moving part. The fixing part has a receiving cavity inside, and the receiving cavity has an internal follower that works in conjunction with an external driving component. The end of the internal follower near the moving part is connected to a transmission rod, and the side of the transmission rod near the moving part has at least one deceleration component.

[0008] The deceleration assembly includes a rotating cylinder threaded to the inner wall of the receiving cavity. One end of the transmission rod passes through the rotating cylinder and is connected to a drive gear. The drive gear meshes with several driven gears with a diameter larger than the drive gear. An internal gear ring that mates with the driven gears is provided on the inner wall of the rotating cylinder. The end of the rotating cylinder away from the driven part inside the body is rotatably connected to the moving part.

[0009] According to the implantable bone lengthening intramedullary nail of this utility model, the internal driven component is a permanent magnet, and the external driving component is an electromagnet used to drive the internal driven component to rotate.

[0010] According to the present invention, the implantable bone lengthening intramedullary nail has several deceleration components arranged in a straight line between the fixed part and the moving part. The drive gear of the deceleration component near the fixed part is connected to the transmission rod, and the drive gears of the remaining deceleration components are all connected to the rotating cylinder of the previous deceleration component. The deceleration component near the moving part is connected to the moving part, and the rotating cylinder of the deceleration component near the moving part is threadedly connected to the inner wall of the receiving cavity.

[0011] According to the present invention, the insertable bone lengthening intramedullary nail has a slot at one end of the rotating cylinder near the moving part, and a locking block that cooperates with the slot is rotatably connected to the moving part, and the locking block is disposed in the slot.

[0012] According to the implantable bone lengthening intramedullary nail of this utility model, the driven gear inside the rotating cylinder is configured as three, and the three driven gears are evenly distributed along the outer periphery of the driving gear.

[0013] According to the present invention, the movable part is provided with a limiting groove, and the fixed part is provided with a limiting rod that cooperates with the limiting groove.

[0014] According to the present invention, the implantable bone lengthening intramedullary nail has both the fixed part and the movable part connected to the patient's fractured bone via connectors.

[0015] The purpose of this invention is to provide an implantable intramedullary nail for bone lengthening, comprising a fixed part and a movable part. Through the cooperation of an external driving component and an internal driven component, the movable part can be moved, thereby moving the fractured bone in the patient, promoting normal bone growth, reducing the wound area on the patient's limb, and is simple to operate and convenient to use. The deceleration component allows the user to finely adjust the movable part, better controlling the movement distance of the fractured bone. In summary, the beneficial effects of this invention are: it can reduce the wound area on the patient's limb while promoting normal bone growth, and it is simple to operate and convenient to use. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the present invention;

[0017] Figure 2 This is an exploded view of the deceleration assembly.

[0018] Figure 3 This is a cross-sectional view of the deceleration assembly;

[0019] In the figure: 1-fixed part, 11-accommodating cavity, 12-limiting rod, 2-moving part, 21-block, 22-limiting groove, 3-inner driven part, 31-transmission rod, 4-reduction assembly, 41-rotating cylinder, 411-slot, 42-drive gear, 43-driven gear, 5-connecting part, 6-external driving part. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

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

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved / connected", "connected", etc., should be interpreted broadly. 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 a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0023] See Figures 1-3 This invention provides an implantable bone lengthening intramedullary nail, comprising a fixing part 1 and a moving part 2. The fixing part 1 and the moving part 2, when combined, form an intramedullary nail, used as an internal fixation device for treating fractures of long bones (such as the femur, tibia, humerus, etc.). It stabilizes the fracture ends by being inserted into the medullary cavity at the fracture site. The material and diameter of the fixing part 1 and the moving part 2 can be adjusted appropriately by those skilled in the art according to the patient's actual condition. Both the fixing part 1 and the moving part 2 are connected to the patient's fractured bone via connectors 5. Moving the moving part 2 moves the patient's fractured bone... The movement promotes growth. The fixed part 1 has a receiving cavity 11 inside. One end of the moving part 2 is inserted into the receiving cavity 11. The receiving cavity 11 has an internal follower 3. The internal follower 3 cooperates with the external drive 6 set outside the patient. By opening the external drive 6, the external drive 6 can drive the internal follower 3 located in the receiving cavity 11 to rotate. The end of the internal follower 3 near the moving part 2 is connected to the transmission rod 31. The transmission rod 31 can rotate with the internal follower 3. The side of the transmission rod 31 near the moving part 2 is provided with a deceleration component 4.

[0024] See Figures 1-3 Preferably, the internal driven element 3 is a permanent magnet, and the external driving element 6 is a driver (mainly composed of electromagnets) that can drive the internal driven element 3 to rotate. Using the external driver to control the rotation of the internal permanent magnet is a mature existing technology in this field. Its specific structure and working principle will not be described in detail here.

[0025] See Figures 1-3 Specifically, the connector 5 is a bone pin, which ensures that the fixed part 1 and the movable part 2 are stably fixed to the broken bone of the patient.

[0026] See Figures 1-3The deceleration assembly 4 includes a rotating cylinder 41 threadedly connected to the inner wall of the receiving cavity 11. The rotating cylinder 41 is hollow, and one end of the transmission rod 31 passes through the interior of the rotating cylinder 41. The transmission rod 31 and the driven member 3 inside the cylinder are rotatably connected to the rotating cylinder 41. A drive gear 42 is connected to the transmission rod 31 inside the rotating cylinder 41. The drive gear 42 meshes with several driven gears 43, and the diameter of the drive gear 42 is smaller than the diameter of the driven gears 43. Several driven gears 43 are rotatably connected to the rotating cylinder 41. The inner wall of the rotating cylinder 41 is provided with... The internal gear ring that cooperates with the driven gear 43 is rotatably connected to the moving part 2 at the end of the rotating cylinder 41 away from the driven member 3 inside the body. When the transmission rod 31 drives the drive gear 42 to rotate, the drive gear 42 drives several driven gears 43 to rotate, and the several driven gears 43 drive the internal gear ring on the inner wall of the rotating cylinder 41 to rotate, thereby driving the rotating cylinder 41 to rotate. The external thread of the rotating cylinder 41 cooperates with the internal thread on the inner wall of the receiving cavity 11, so that the rotating cylinder 41 rotates and moves in the receiving cavity 11, thereby driving the moving part 2 to move.

[0027] See Figures 1-3 Specifically, the rotating cylinder 41 is provided with a slot 411 at one end near the moving part 2, and a locking block 21 that cooperates with the slot 411 is rotatably connected to the moving part 2. The locking block 21 is set in the slot 411 to improve the convenience of connection between the rotating cylinder 41 and the moving part 2.

[0028] See Figures 1-3 Preferably, there are three driven gears 43 inside the rotating cylinder 41, and the three driven gears 43 are evenly distributed along the outer periphery of the driving gear 42. By cooperating with each other, the rotation speed of the rotating cylinder 41 can be adjusted, and the stability of the rotation of the rotating cylinder 41 can be improved.

[0029] See Figures 1-3 Furthermore, the moving part 2 is provided with a limiting groove 22, and the fixed part 1 is provided with a limiting rod 12 that cooperates with the limiting groove 22. When the moving part 2 moves with the rotating cylinder 41, the limiting rod 12 and the limiting groove 22 cooperate with each other to ensure the stable movement of the moving part 2 and prevent the moving part 2 from rotating.

[0030] See Figures 1-3Preferably, there are several reduction gear components 4, which are arranged in a straight line between the fixed part 1 and the moving part 2. The drive gear 42 of the reduction gear component 4 closest to the fixed part 1 is connected to the transmission rod 31. The drive gear 42 of the remaining reduction gear components 4 are all connected to the rotating cylinder 41 of the previous reduction gear component 4. The reduction gear component 4 closest to the moving part 2 is connected to the moving part 2, and the rotating cylinder 41 of the reduction gear component 4 closest to the moving part 2 is threaded to the inner wall of the receiving cavity 11. By using the mutual transmission of several reduction gear components 4, the rotation effect decreases in sequence, and the speed of the rotating cylinder 41 can be further adjusted, which makes it convenient for the user to finely adjust the moving part 2.

[0031] See Figures 1-3 When in use, when it is necessary to adjust the position of the patient's fractured bone (i.e., adjust the position of the moving part 2), the external drive 6 drives the internal driven part 3 located in the receiving cavity 11 to rotate. (After the internal driven part 3 is implanted in the patient's body, it can be marked on the patient's skin to facilitate finding the position of the internal driven part 3. Although the marked position may deviate from the actual position of the internal driven part 3, and the position of the internal driven part 3 will also move after subsequent adjustment, the external drive 6 will attract the internal driven part 3, and the small distance error will not affect the transmission of the external drive 6, so only the approximate position needs to be found.) After adjustment by the deceleration component 4, the moving part 2 is driven to move, thereby playing the role of bone lengthening.

[0032] This invention provides an implantable intramedullary nail for bone lengthening, comprising a fixed part and a movable part. Through the cooperation of an external driving component and an internal driven component, the movable part can be moved, thereby moving the fractured bone in the patient, promoting normal bone growth, reducing the wound area on the patient's limb, and is simple and convenient to operate. The deceleration component allows the user to precisely adjust the movable part, better controlling the movement distance of the fractured bone. In summary, the beneficial effects of this invention are: it can reduce the wound area on the patient's limb while promoting normal bone growth, and it is simple and convenient to operate.

[0033] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. An implantable bone lengthening intramedullary nail, characterized in that, It includes a fixed part and a movable part. The fixed part has a receiving cavity inside. The receiving cavity has an internal driven part that works with the external driving part. The end of the internal driven part near the movable part is connected to a transmission rod. The side of the transmission rod near the movable part has at least one speed reduction component. The deceleration assembly includes a rotating cylinder threaded to the inner wall of the receiving cavity. One end of the transmission rod passes through the rotating cylinder and is connected to a drive gear. The drive gear meshes with several driven gears with a diameter larger than the drive gear. An internal gear ring that mates with the driven gears is provided on the inner wall of the rotating cylinder. The end of the rotating cylinder away from the driven part inside the body is rotatably connected to the moving part.

2. The implantable bone lengthening intramedullary nail according to claim 1, characterized in that, The internal driven component is a permanent magnet, and the external driving component is an electromagnet used to drive the internal driven component to rotate.

3. The implantable bone lengthening intramedullary nail according to claim 1, characterized in that, The deceleration components are configured as a plurality of units, and the plurality of deceleration components are arranged in a straight line between the fixed part and the moving part. The drive gear of the deceleration component closer to the fixed part is connected to the transmission rod, and the drive gears of the remaining deceleration components are all connected to the rotating cylinder of the previous deceleration component. The deceleration component closer to the moving part is connected to the moving part, and the rotating cylinder of the deceleration component closer to the moving part is threadedly connected to the inner wall of the receiving cavity.

4. The implantable bone lengthening intramedullary nail according to claim 1, characterized in that, The rotating cylinder has a slot at one end near the moving part, and a locking block that cooperates with the slot is rotatably connected to the moving part. The locking block is set in the slot.

5. The implantable bone lengthening intramedullary nail according to claim 3, characterized in that, The rotating cylinder contains three driven gears, which are evenly distributed along the outer periphery of the driving gear.

6. The implantable bone lengthening intramedullary nail according to claim 1, characterized in that, The moving part is provided with a limiting groove, and the fixed part is provided with a limiting rod that cooperates with the limiting groove.

7. The implantable bone lengthening intramedullary nail according to claim 1, characterized in that, Both the fixed part and the movable part are connected to the patient's broken bone via connectors.

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