A single-rod bone distraction device

Abstract

The present invention provides a single-rod bone distraction device. The bone distraction device includes a main body structure of the bone distraction device, a rod needle clamp, and bone needles. The main body structure of the bone distraction device includes a base rod and a sleeve. The base rod includes an adjustment section in the middle and first and second fixed sections at both ends. The sleeve is slidably sleeved on the adjustment section. The adjustment section is provided with an axially extending guide groove. A guide key that is slidably and cooperatively engaged with the guide groove is detachably installed on the sleeve. The outer surface of the adjustment section is provided with an external thread. The two ends of the sleeve are respectively provided with first and second nuts that are threadedly engaged with the external thread through internal threads. By screwing the first and second nuts, the sleeve is driven to move axially. The rod needle clamp and the bone needles are installed on the first and second fixed sections to fix the two ends of the bone to be distracted. The rod needle clamp and the bone needles are installed on the sleeve. It has the advantages of simple structure, easy bone fixation, low cost, convenient and fast operation, and can be used in combination with a ring external fixator and a combined external fixator.

Description

Technical Field

[0001] The present invention relates to a single-rod bone distraction device. Background Art

[0002] A bone distraction device is a dedicated device for achieving bone lengthening. Bone distraction, namely distraction osteogenesis, mainly aims at bone regeneration of bone defects. By osteotomizing the proximal or distal end of the bone defect, cutting the bone mass while preserving soft tissues and blood supply, the bone distraction device fixes both ends of the bone and slowly pulls the transected free bone segment towards the defect, continuously stimulating the body tissue and activating the potential of human tissue regeneration, so that new bone forms in the osteotomy gap, achieving the purpose of bone regeneration. The traditional external fixation scaffolds for bone lengthening are ring external fixation scaffolds or track external fixation scaffolds, which have disadvantages such as complex structure, cumbersome operation, inability to freely insert needles with screw fixation, inability to provide appropriate stress stimulation to the fracture end, stress shielding of the external fixation scaffold, bone delayed union, nonunion, slow bone mineralization speed, and long wearing time of the scaffold, restricting their popularization and application. Summary of the Invention

[0003] The purpose of the present invention is to provide a single-rod bone distraction device with simple structure, convenient operation, easy fixation, capable of providing axial stress stimulation to the fracture end and accelerating bone healing.

[0004] The technical solution of the present invention is realized as follows:

[0005] Single-rod bone distraction device, comprising a main structure of the bone distraction device, a rod needle clamp and bone needles. The main structure of the bone distraction device includes a base rod and a sleeve. The sleeve is provided with two structural forms: adjustment section adjustment and top adjustment. For the adjustment section adjustment structure, the base rod includes an intermediate adjustment section and first and second fixed sections at both ends. The sleeve is slidably sleeved on the adjustment section. The adjustment section is provided with axially extending guide grooves, and the sleeve is provided with guide keys slidably engaged with the guide grooves. The outer surface of the adjustment section is provided with external threads, and both ends of the sleeve are respectively provided with first and second nuts that are threadedly engaged with the external threads through internal threads. By screwing the first and second nuts, the sleeve is driven to move axially. For the top adjustment structure, the base rod includes an intermediate adjustment section and first and second fixed sections at both ends. The sleeve is slidably sleeved on the adjustment section. The adjustment section is provided with axially extending guide grooves, and the sleeve is provided with guide keys slidably engaged with the guide grooves. The top of the base rod is provided with an adjustment nut, a threaded rod, a pin, a fixed sleeve, a limit sleeve, and a fastening pin. The adjustment nut is sleeved on the adjustment screw rod and is fixedly connected to the threaded rod through a pin. The fixed sleeve is sleeved on the threaded rod and is slidably connected to the threaded rod. One end of the fixed sleeve abuts against the adjustment nut, and the other end abuts against the top of the base rod and is threadedly connected to the inner wall of the base rod. The limit sleeve is sleeved on the threaded rod and is fixedly connected to the threaded rod through a fastening pin. One end of the limit sleeve abuts against the top of the fixed sleeve. An outer sleeve is sleeved on the outer wall of the adjustment section of the base rod and is slidably connected to the base rod. An inner sleeve is provided on the inner wall and is slidably connected to the base rod. The inner wall of the inner sleeve is provided with threads and is threadedly connected to the threaded rod. One end of the inner sleeve is fixedly connected to the outer sleeve through a guide key. The first and second fixed sections are installed with rod needle clamps and bone needles to fix both ends of the bone to be distracted, and the sleeve is installed with rod needle clamps and bone needles to traction the free bone segment towards the defect when the sleeve moves.

[0006] Further, at least one of the first and second fixed sections can be set as a split section that can move relative to the adjustment section to achieve fine adjustment.

[0007] Further, a pressure regulating device is provided between the split section and the adjustment section, and an axially guiding structure is also provided between the adjustment section and the split section.

[0008] Further, the adjustment section and the split section are sleeved with each other to form the guiding structure. The adjustment section is provided with axially extending through long holes. A stop pin is slidably assembled in the through long holes. Both ends of the stop pin extend out from both sides of the through long holes. The pressure regulating device is arranged between the stop pin and the split section. One end of the first fixed section has external threads, and an extrusion nut is screwed on the external threads of the first fixed section.

[0009] Further, the pressure regulating device is a two-way pressure regulation.

[0010] Further, a limit sleeve is also sleeved on the outside of the adjustment section.

[0011] Further, the split section is connected to the first fixed section by a connecting pin.

[0012] Further, the guiding key is a slider, and the slider is fixed to the inner wall of the sleeve by at least one pin.

[0013] Further, the guiding key is a pin shaft, and at least one end of the two ends of the pin shaft is inserted into the penetrating long hole of the adjustment section.

[0014] Further, a pressing sleeve is provided at the top of at least one of the first and second nuts.

[0015] By adopting the above technical solutions, the beneficial effects of the present invention are as follows: Compared with the prior art, the single-rod bone distraction device of the present invention can be used alone. It only needs to fix the two ends to the two ends of the broken bone through the rod needle clamp and the bone needle, and then drive the transected free bone segment to slowly move towards the bone defect through the rod needle clamp and the bone needle, so as to stimulate the body tissue and form new bone to achieve the purpose of bone lengthening; it can also be used in cooperation with the ring external fixator and the combined external fixator, with easy fixation and convenient operation. In addition, after the single-rod bone distraction device is provided with a micro-motion device and a pressure-regulating device, the stress at the fracture end can be regulated, avoiding stress shielding at the fracture end, accelerating fracture healing, and shortening the time of wearing the external fixator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic structural diagram of the first embodiment of the single-rod bone distraction device of the present invention;

[0018] Figure 2 It is Figure 1 a partial enlarged view of part A in

[0019] Figure 3 a schematic diagram of the principle in the use state;

[0020] Figure 4 It is Figure 3 a left partial view of

[0021] Figure 5 It is a partial structural diagram of the second embodiment of the single-rod bone distraction device;

[0022] Figure 6Local structural schematic diagram of the third embodiment of the single-rod bone distraction device;

[0023] Figure 7 Local structural schematic diagram of the fourth embodiment of the single-rod bone distraction device;

[0024] Figure 8 Local structural schematic diagram of the fifth embodiment of the single-rod bone distraction device;

[0025] Figure 9 is Figure 8 Local enlarged schematic diagram at position B in;

[0026] Figure 10 Structural schematic diagram of two-way pressure regulation;

[0027] Figure 11 Local structural schematic diagram of the seventh embodiment of the single-rod bone distraction device;

[0028] Figure 12 Local structural schematic diagram of the eighth embodiment of the single-rod bone distraction device;

[0029] Figure 13 Local structural schematic diagram of the ninth embodiment of the single-rod bone distraction device;

[0030] Figure 14 Local structural schematic diagram of the tenth embodiment of the single-rod bone distraction device;

[0031] Figure 15 Local structural schematic diagram of the eleventh embodiment of the single-rod bone distraction device;

[0032] Figures 1-9 Among them: 01 - bone to be distracted, 02 - free bone segment, 03 - defect site, 04 - truncation site, 10 - main body structure of the bone distraction device, 111 - adjustment section, 1011 - penetration long hole, 1012 - through long hole, 121 - split section, 131 - fixed section, 102 - sleeve, 1021 - guiding key, 103 - first nut, 104 - second nut, 105 - compression nut, 106 - pressure regulating spring, 107 - stop pin, 108 - extrusion nut, 109 - limit sleeve, 110 - pin, 120 - pin shaft (not marked in the figure and not appearing in the embodiment), 20 - rod needle clamp, 30 - bone needle;

[0033] Figures 10-12 Among them: 10 - threaded rod, 11 - adjusting nut, 12 - connecting pin, 13 - fixed screw sleeve, 14 - limit screw sleeve, 15 - base rod, 16 - fastening pin, 17 - outer sleeve, 18 - connecting half pin, 19 - inner sleeve, 20 - long pin;

[0034] Figures 13-14Among them, 15 - base rod, 22 - sliding rod, 23 - fastening nut, 24 - anti - rotation pin, 26 - long hole. Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0036] The first embodiment of the single - rod bone distraction device of the present invention: As Figures 1-4 shown, the single - rod bone distraction device includes a bone distraction device main structure 10, a rod - needle clamp 20, and a bone needle 30. The bone distraction device main structure includes a base rod and a sleeve 102. The base rod includes an intermediate adjustment section 111 and first and second fixed sections at both ends. In this embodiment, the upper part is the first fixed section 131 integrated with the adjustment section 111, and the lower second fixed section is a split section 121. The sleeve 102 is slidably sleeved on the adjustment section 111. The adjustment section 111 is provided with an axially extending guide groove. In this embodiment, the guide groove is a through - long hole 1011 penetrating the adjustment section 111 in the radial direction. The sleeve 102 is provided with a guide key 1021 slidably engaged with the through - long hole 1011. The guide key 1021 in this embodiment is a cylindrical pin shaft, and both ends of the pin shaft are slidably engaged with the groove walls on both sides of the through - long hole 1011. In other embodiments, Figure 2 the two guide keys 1021 can also be replaced by only one. The outer surface of the adjustment section 111 is provided with an external thread. The two ends of the sleeve 102 are respectively provided with a first nut 103 and a second nut 104 that are thread - engaged with the external thread through internal threads. By screwing the first and second nuts, the sleeve 102 is driven to move axially. As Figures 3-4 shown, the rod - needle clamp 20 and the bone needle 30 are installed on the first and second fixed sections to fix both ends 01 of the bone to be distracted. The rod - needle clamp 20 and the bone needle 30 are installed on the sleeve 102 so as to distract the free bone segment 02 towards the defect 03 when the sleeve 102 moves.

[0037] In this embodiment, at least one of the first and second fixed segments is a split segment 121 that can move relative to the adjustment segment 111 to achieve fine adjustment. At this time, the device is a micro-motion type nut adjustment type. After the pressing nut 108 is tightened, the split segment 121 is locked. After the pressing nut 108 is loosened, the split segment 121 can be adjusted axially with a small amplitude. The retaining pin 107 is an anti-rotation pin to realize the connection between the split segment 121 and the base rod. The setting of the split segment enables fine adjustment to be realized through the splitting of the split segment and the adjustment segment on the basis of a large-range adjustment of the middle adjustment segment. Moreover, the direction of fine adjustment can be adjusted along the moving direction of the free fractured bone or in the reverse direction of the moving direction of the free fractured bone, with flexible adjustment. In other embodiments, both the first and second fixed segments can be replaced with split segments to achieve fine adjustment on both sides of the adjustment segment. The split segment and the adjustment segment are connected by internal and external threads. The guide key is a pin shaft, and both ends of the pin shaft are inserted into the through long holes of the adjustment segment. One of the tops of the first and second nuts is provided with a pressing nut 105.

[0038] Among them, the knitting needle clamp 20 and the bone needle 30 are both prior arts. The knitting needle clamp is a special fixture for the bone needle, which can be fixed on a cylindrical rod and has a clamping surface for clamping the bone needle. The bone needle can freely adjust the angle between the clamping surfaces and can be locked after the adjustment is completed.

[0039] During use: As Figure 3 shown, fix both ends relative to both ends of the fractured bone through the knitting needle clamp and the bone needle, and then drive the truncated free bone segment to slowly move towards the bone defect through the knitting needle clamp and the bone needle, so as to achieve the purpose of stimulating the body tissue to form new bone for bone lengthening. When disassembling, just pull out the bone needle. During adjustment, drive the sleeve to move on the adjustment segment through the first and second nuts. On the one hand, the movement is convenient and fast. On the other hand, the fixing method of the two nuts on both sides has the risk of not being easily touched and slipping or loosening, with good stability, ensuring the safety, stability and accuracy after adjustment, and there is no need for intramedullary pinning. Therefore, it has the characteristics of convenient and fast operation and small trauma. After the device is removed, the bone and soft tissue heal quickly. In addition, the device is only composed of components such as screws, nuts, knitting needle clamps, and bone needles that are convenient to process, and the cost is relatively low, suitable for large-scale promotion, especially suitable for the families of patients with poor family economic conditions.

[0040] The second embodiment of the single-rod bone transport device of the present invention: As Figure 5 shown, the difference from the first embodiment is that the guide key 1021 is a semi-pin shaft, one end of which is fixed on the sleeve 102 and the other end extends from one side of the through long hole 1011 to achieve guidance. There is a round hole on the sleeve, and the diameter of the round hole is the same as the outer diameter of the guide key. The guide key 1021 is in a tight fit with the round hole. At this time, the through long hole 1011 can also be replaced with a long groove.

[0041] The third embodiment of the single-rod bone distraction device of the present invention: As Figure 6 shown, the difference from the first embodiment is that the guiding key 1021 is two semi-pins arranged coaxially. One end of each of the two semi-pins is fixed on the sleeve, and the other ends respectively extend into the through long hole 1011 from both sides, so as to achieve axial guidance.

[0042] The fourth embodiment of the single-rod bone distraction device of the present invention: As Figure 7 shown, this embodiment is a fixed nut adjustment type. The difference from the first embodiment is that the guiding key 1021 is a slider, and the slider is fixed on the inner wall of the sleeve 102 by two pins 110. The guiding is realized by the guiding sliding fit between the slider and the side wall on one side of the through long hole 1011. At this time, the through long hole 1011 can also be replaced by a long groove.

[0043] The fifth embodiment of the single-rod bone distraction device of the present invention: As Figures 8-9 shown, the difference from the first embodiment is that a one-way pressure regulating device is provided between the split section 121 and the adjustment section 111. The one-way pressure regulating device can be a pressure regulating spring 106, and the pressure regulating spring 106 provides an upward acting force to the split section 121. An axially guiding structure is also provided between the adjustment section 111 and the split section 121. The setting of the pressure regulating spring makes the elastic acting force between the adjustment section and the split section. This elastic acting force acts on the fracture end through the sleeve, the needle holder and the bone needle, giving an elastic acting force to the fracture end. Compared with the traditional rigid adjustment of non-elastic adjustment, it promotes the healing of the fracture. The adjustment section and the split section are sleeved with each other to form a guiding structure. The adjustment section 111 is provided with an axially extending through long hole 1012. A retaining pin 107 is slidably assembled in the through long hole 1012. Both ends of the retaining pin 107 extend out from both sides of the through long hole. A pressure regulating spring 106 is arranged between the retaining pin 107 and the split section 121. An extrusion nut 108 for pushing the retaining pin towards the adjusting spring is screwed on the external thread of the adjustment section 111. A limiting sleeve 109 is also sleeved outside the adjustment section 111, and the inner diameter of the limiting sleeve 109 is greater than the length of the retaining pin 107.

[0044] The sixth embodiment of the single-rod bone distraction device of the present invention: As Figure 10 shown, the difference from the fifth embodiment is that a two-way pressure regulating device is provided between the split section 121 and the adjustment section 111. The two-way pressure regulating device can be a pressure regulating spring 106, and the pressure regulating spring 106 provides an upward acting force to the split section 121. An axially guiding structure is also provided between the adjustment section 111 and the split section 121. Upper and lower extrusion nuts 108 are screwed on the external thread of the adjustment section. A limiting sleeve 109 is also sleeved outside, and the inner diameter of the limiting sleeve 109 is greater than the length of the retaining pin 107.

[0045] The seventh embodiment of the single-rod bone distraction device of the present invention: As Figure 11 shown, this embodiment is a top adjustment structure. The base rod 15 includes an intermediate adjustment section and first and second fixed sections at both ends. The sleeve is slidably sleeved on the adjustment section. The adjustment section is provided with an axially extending guide groove, and the sleeve is provided with a guide key slidably engaged with the guide groove. The top of the base rod 15 is provided with an adjusting nut 11, a threaded rod 10, a pin, a fixed sleeve 13, a limit sleeve 14, and a fastening pin 16. The adjusting nut 11 is sleeved on the adjusting screw rod and is fixedly connected to the threaded rod 10 through a pin. The fixed sleeve 13 is sleeved on the threaded rod 10 and is slidably connected to the threaded rod 10. One end of the fixed sleeve 13 abuts against the adjusting nut 11, and the other end abuts against the top of the base rod 15 and is threadedly connected to the inner wall of the base rod 15. The limit sleeve 14 is sleeved on the threaded rod 10 and is fixedly connected to the threaded rod 10 through a fastening pin 16. One end of the limit sleeve 14 abuts against the top of the fixed sleeve 13; an outer sleeve 17 is sleeved on the outer wall of the adjustment section of the base rod 15 and is slidably connected to the base rod 15. An inner sleeve 19 is provided on the inner wall and is slidably connected to the base rod 15. The inner wall of the inner sleeve 19 is provided with threads and is threadedly connected to the threaded rod 10. One end of the inner sleeve 19 is fixedly connected to the outer sleeve 17 through a guide key.

[0046] During use: By rotating the adjusting nut 11 at the upper part, the threaded rod 10 is driven to rotate through the connecting pin 12. The limit sleeve 14 rotates accordingly. The fixed sleeve 13 and the base rod 15 remain stationary. The rotation of the threaded rod 10 drives the inner sleeve 19 threadedly connected thereto to move up and down, thereby driving the outer sleeve 17 to move up and down. The needle holder and bone needle fixed on the outer sleeve 17 move accordingly, driving the bone to move, and realizing bone distraction.

[0047] The eighth embodiment of the single-rod bone distraction device of the present invention: As Figure 12 shown, the difference from the seventh embodiment is that its connecting half-pin is replaced with a through-length long pin 20, and both ends thereof penetrate through the inner sleeve 19, the base rod 15, and the outer sleeve 17 at the same time.

[0048] The ninth embodiment of the single-rod bone distraction device of the present invention: As Figure 13 shown, the difference from the seventh embodiment is that the connection between the inner sleeve, the base rod, and the outer sleeve is realized through two symmetrically and coaxially arranged connecting half-pins.

[0049] The tenth embodiment of the single-rod bone distraction device of the present invention: As Figure 14As shown, the difference from the seventh embodiment is that it is a micro-motion nut adjustment type. By adding a sliding rod 22 to one end of the base rod, one end of the sliding rod 22 has an external thread and is connected with a fastening nut 23 through the external thread. The lower end of the sliding rod 22 also has a long hole 26 penetrating radially, and an anti-rotation pin 24 is installed in the long hole 26 to realize the connection with the base rod. When in use, loosen the fastening nut 23, and the sliding rod 22 can be axially moved. And due to the existence of the anti-rotation pin 24, the sliding rod 22 will not rotate relative to the base rod. After tightening the fastening nut 23, the sliding rod 22 cannot move.

[0050] The eleventh embodiment of the single-rod bone distraction device of the present invention: As Figure 15 shown, the difference from the fifth embodiment is that the nut adjustment at the lower part is modified to the top adjustment in the above embodiment.

[0051] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Single-rod bone distraction device, characterized in that It includes the main structure of the bone distraction device, the rod needle clamp and the bone needle. The main structure of the bone distraction device includes a base rod and a sleeve. The sleeve is set in the form of a top adjustment structure; for the top adjustment structure, the base rod includes an intermediate adjustment section and first and second fixed sections at both ends. The sleeve is slidably sleeved on the adjustment section. The adjustment section is provided with an axially extending guide groove, and the sleeve is provided with a guide key slidably matched with the guide groove. The top of the base rod is provided with an adjusting nut, a threaded rod, a pin, a fixed sleeve, a limit sleeve, and a fastening pin. The adjusting nut is sleeved on the adjusting screw and is fixedly connected to the threaded rod through the pin. The fixed sleeve is sleeved on the threaded rod and is slidably connected to the threaded rod. One end of the fixed sleeve abuts against the adjusting nut, and the other end abuts against the top of the base rod and is threadedly connected to the inner wall of the base rod. The limit sleeve is sleeved on the threaded rod and is fixedly connected to the threaded rod through the fastening pin. One end of the limit sleeve abuts against the top of the fixed sleeve; an outer sleeve is sleeved outside the adjustment section of the base rod and is slidably connected to the base rod. An inner sleeve is provided on the inner wall and is slidably connected to the base rod. The inner wall of the inner sleeve is provided with threads and is threadedly connected to the threaded rod. One end of the inner sleeve is fixedly connected to the outer sleeve through the guide key; the first and second fixed sections are installed with needle clamps and bone needles to fix both ends of the bone to be distracted. The sleeve is installed with rod needle clamps and bone needles so as to traction the free bone segment towards the defect when the sleeve moves; a limit sleeve is also sleeved outside the adjustment section; At least one of the first and second fixed sections can be set as a split section that can move relative to the adjustment section to achieve fine adjustment; a pressure regulating spring is provided between the split section and the adjustment section.

2. The single-rod bone distraction device according to claim 1, characterized in that, An axially guiding structure is also provided between the adjustment section and the split section.

3. The single-rod bone distraction device according to claim 2, wherein, The adjustment section and the split section are sleeved with each other to form the guiding structure. The adjustment section is provided with an axially extending through long hole. A stop pin is slidably assembled in the through long hole. Both ends of the stop pin extend out from both sides of the through long hole. The pressure regulating spring is arranged between the stop pin and the split section. One end of the first fixed section has an external thread, and an extrusion nut is screwed on the external thread of the first fixed section.

4. The single-rod bone distraction device according to claim 1, wherein The split section and the first fixed section are connected by a connecting pin.

5. The single-rod bone distraction device according to claim 4, characterized in that The guide key is a slider, and the slider is fixed on the inner wall of the sleeve through at least one pin.

6. The single-rod bone distraction device according to claim 5, characterized in that, The guide key is a pin shaft, and at least one of the two ends of the pin shaft is inserted into the through long hole of the adjustment section.

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