Bone transport external fixation frame

Abstract

The utility model relates to a kind of bone transport outer fixed support including base, pull screw rod, adjusting knob, guide rail and pull base, when adjusting knob is pulled upward, spring compression, the bottom end of adjusting knob is separated from seat top end, keep the action of pull adjusting knob and rotate adjusting knob drive fixed nut rotation, pull screw rod is threadedly displaced upward to drive pull base to move upward, adjusting knob is circumferentially jointed with fixed nut, operator need not with the help of tool can directly complete adjusting action by pull and rotation adjusting knob, simplify the operation process, after hand is loosened, the spring reset force can make the bottom end of adjusting knob and the top end of base relock, the bottom end of adjusting knob is compacted in the top end of seat, the bottom end of adjusting knob is circumferentially jointed in the top end of base and limit its rotation, form anti-reverse mechanism, avoid in the adjusting process accidentally loosening bone block retraction, improve the security and control accuracy of bone block moving process, guarantee the predictability and reliability of treatment effect.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an external fixation bracket for bone transport. Background Technology

[0002] Existing bone transport external fixation devices include an upper support and a lower support. The upper support has a threaded rod running through it, and a knob is located at the top of the rod. The bottom of the rod is threaded to the lower support. Rotating the knob moves the upper support upward. Most of these devices do not have a screw anti-rotation mechanism. Current bone transport devices with anti-rotation mechanisms often require additional tools for unlocking, adjusting, and locking. Furthermore, during adjustment, there is a risk of bone retraction due to accidental loosening or external interference, affecting the safety and controllability of the treatment.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model discloses a bone transport external fixation bracket to solve the problem of bone retraction caused by accidental loosening or external force interference during adjustment, which affects the safety and controllability of treatment.

[0005] The technical solution adopted in this utility model is as follows: An external fixator for bone transport includes: The base has connecting rods fixed on both sides; A lifting screw extends axially through the base and has a fixing nut at its top; the fixing nut includes a snap-fit ​​portion at the top and an extension portion at the bottom. An adjustment knob has a first groove at its top. The locking part is circumferentially locked into the top of the first groove. An annular inner cavity is formed between the extension and the inner wall of the first groove. A spring is sleeved on the outside of the extension. The top of the spring abuts against the bottom of the locking part, and the bottom of the spring abuts against the bottom of the first groove. The bottom of the adjustment knob is circumferentially locked into the top of the base. The guide rail is fixedly connected to the base; The lifting base is slidably mounted on the guide rail; the lifting base is provided with a threaded through hole, and the bottom end of the lifting screw passes through the through hole of the base and is threadedly engaged with the threaded through hole of the lifting base.

[0006] A further technical solution is that a retaining ring is provided on the inner side of the bottom end of the base, and the top of the retaining ring restricts the bottom end of the extension from extending out of the base.

[0007] A further technical solution is that the cross-sectional shape of the first groove is hexagonal, and the snap-fit ​​part of the fixing nut is hexagonal and matches the cross-sectional shape of the first groove. The snap-fit ​​part is slidably disposed in the first groove.

[0008] A further technical solution is that the depth of the first groove is less than the thickness of the adjustment knob, and a stepped portion is formed at the bottom of the first groove, with the bottom end of the spring abutting against the stepped portion.

[0009] A further technical solution is that a second groove is provided at the top of the base, and a limiting part is provided at the bottom of the step portion, which is engaged with the second groove.

[0010] A further technical solution is that a number of protrusions are provided circumferentially on the outer side of the limiting part, and a number of concave holes matching the number of protrusions are opened on the inner wall of the second groove, and the protrusions are engaged in the concave holes.

[0011] A further technical solution is that the guide rail has two rails, which are fixed to the bottom end of the base and located on the left and right sides of the lifting screw, respectively.

[0012] A further technical solution is that at least one first clamping part is slidably connected to the connecting rod, and the first clamping part clamps a first bone needle.

[0013] A further technical solution is that the left and right sides of the lifting base are provided with second clamping parts, and the second clamping parts hold the second bone needles.

[0014] The beneficial effects of this utility model embodiment are as follows: (I) A bone transport external fixation bracket includes a base, a lifting screw, an adjusting knob, a guide rail, and a lifting base. When the adjusting knob is pulled upward, the spring is compressed, and the bottom end of the adjusting knob separates from the top end of the base. Maintaining the action of pulling the adjusting knob and rotating the adjusting knob drives the fixing nut to rotate, causing the lifting screw to move upward relative to the fixing nut, thereby driving the lifting base to move upward. The adjusting knob and the fixing nut are circumferentially engaged. The operator can directly complete the adjustment action by pulling and rotating the adjusting knob without the aid of tools, simplifying the operation process. After releasing the knob, the spring's restoring force can relock the bottom end of the adjusting knob and the top end of the base. Under the biasing force of the spring, the bottom end of the adjusting knob is pressed against the top end of the base. The circumferential engagement of the bottom end of the adjusting knob with the top end of the base restricts its rotation, forming an effective anti-reverse mechanism. This avoids the risk of bone retraction caused by accidental loosening during the adjustment process, improves the safety and control accuracy of the bone transport process, and thus ensures the predictability and reliability of the treatment effect.

[0015] (ii) Furthermore, a retaining ring is provided on the inner side of the bottom end of the base, and the top of the retaining ring restricts the bottom end of the extension from protruding from the base. By supporting the extension of the fixing nut from the bottom, it is prevented from excessively displacing downwards or falling out of the base under the continuous bias pressure of the spring, ensuring that the adjusting knob, spring and fixing nut can move stably up and down within the preset stroke, thus ensuring the reliability of the structure.

[0016] (iii) Furthermore, the cross-sectional shape of the first groove is hexagonal, and the snap-fit ​​part of the fixing nut is also hexagonal, matching the cross-sectional shape of the first groove. The snap-fit ​​part is slidably disposed in the first groove. The cooperation between the hexagonal snap-fit ​​part and the first groove ensures that the rotational force of the adjusting knob can be completely transmitted to the fixing nut and the lifting screw, providing a strong constraint in the circumferential direction to prevent relative rotation between the two, and leaving a sliding gap in the axial direction so that the adjusting knob can smoothly move up and down along the fixing nut to achieve the switching between the unlocking and locking states.

[0017] (iv) Furthermore, a number of protrusions are circumferentially spaced on the outer side of the limiting part, and a number of recesses matching the protrusions are opened on the inner wall of the second groove, with the protrusions engaging in the recesses. Specifically, there are 4 protrusions, circumferentially spaced on the outer side of the limiting part, and 4 recesses, circumferentially spaced on the inner wall of the second groove. The adjusting knob, based on the protrusions and recesses, can be rotated 1 / 4 turn for adjustment; rotating the adjusting knob one full turn moves the lifting base upward by 1mm. Four circumferentially distributed bosses and recesses divide one rotation into four positions. This ensures that every 1 / 4 turn of the adjustment knob, the boss falls into the recess, providing tactile feedback and effectively preventing the knob from reversing at any position. This eliminates uncontrollable free travel during adjustment, ensures the accuracy of each lifting increment (1mm per rotation), and avoids bone block positioning deviations caused by rotational errors, ensuring that the bone block can be safely and controllably transported to the predetermined position. Attached Figure Description

[0018] Figure 1 This is an isometric view of a bone transport external fixation bracket according to the present invention.

[0019] Figure 2 This is a front view schematic diagram of a portion of the external fixation frame for bone transport according to the present invention.

[0020] Figure 3 This is a longitudinal sectional view of the external fixation bracket for bone transport according to the present invention.

[0021] Figure 4 This is an isometric view of a portion of the external fixation bracket for bone transport according to this utility model.

[0022] In the picture: 100. Base; 101. Second groove; 110. Connecting rod; 120. First clamping part; 130. First bone needle; 140. Retaining ring; 200. Lifting screw; 210. Fixing nut; 211. Snap-fit ​​part; 212. Extension part; 300. Adjusting knob; 301. First groove; 302. Annular inner cavity; 303. Step part; 304. Limiting part; 310. Spring; 400. Guide rail; 500. Lifting base; 501. Threaded through hole; 510. Second clamping part; 511. Buckle post; 512. Sleeve; 513. Adjusting bolt; 514. Insertion hole; 520. Second bone needle. Detailed Implementation

[0023] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0024] First embodiment: like Figure 1 As shown, a bone transport external fixation bracket includes a base 100, a lifting screw 200, an adjusting knob 300, a guide rail 400, and a lifting base 500. Connecting rods 110 are fixed to both sides of the base 100. Exemplarily, at least one first clamping part 120 is slidably connected to the connecting rod 110, and a first bone pin 130 is clamped on the first clamping part 120. The first clamping part 120 on the connecting rod 110 can be added to increase the number of first bone pins 130 according to specific needs.

[0025] like Figures 2-3 As shown, the lifting screw 200 axially passes through the base 100 and has a fixing nut 210 at its top. The fixing nut 210 includes a snap-fit ​​portion 211 at the top and an extension portion 212 at the bottom.

[0026] like Figure 3 As shown, the top of the adjustment knob 300 has a first groove 301. The locking part 211 is circumferentially locked into the top of the first groove 301. An annular inner cavity 302 is formed between the extension part 212 and the inner wall of the first groove 301. The spring 310 is sleeved on the outside of the extension part 212. The top of the spring 310 abuts against the bottom of the locking part 211, and the bottom of the spring 310 abuts against the bottom of the groove 301. The bottom of the adjustment knob 300 is circumferentially locked into the top of the base 100.

[0027] like Figure 2 As shown, the guide rail 400 is fixedly connected to the base 100. For example, there are two guide rails 400, which are fixed to the bottom end of the base 100 and located on the left and right sides of the lifting screw 200, respectively.

[0028] like Figures 2-4As shown, the lifting base 500 is slidably mounted on the guide rail 400. The lifting base 500 has a threaded through hole 501, and the bottom end of the lifting screw 200 passes through the through hole of the base 100 and is threadedly engaged with the threaded through hole 501 of the lifting base 500. For example, the lifting base 500 has second clamping parts 510 on its left and right sides, and the second clamping parts 510 clamp the second bone pins 520. Specifically, the lifting base 500 has two symmetrical mounting holes on its two sides. The second clamping parts include a snap post 511, a sleeve 512, and an adjusting bolt 513. One end of the snap post 511 is screwed to the adjusting bolt 513 through the mounting hole, and the other end has a vertically penetrating insertion hole 514, in which the bone pin is secured. One end of the retaining post 511 passes through the sleeve 512 and the mounting hole in sequence and is screwed to the adjusting bolt 513. The other end is provided with a vertically penetrating insertion hole 514. The bone nail is fixed in the insertion hole 514. When the adjusting bolt 513 is rotated, the retaining post 511 is displaced in the direction of the sleeve 512. The sleeve 512 and the insertion hole 514 engage the bone nail, preventing the bone nail from falling out of the insertion hole 514.

[0029] like Figure 3 As shown, a retaining ring 140 is further provided on the inner side of the bottom end of the base 100, and the top end of the retaining ring 140 restricts the bottom end of the extension 212 from extending out of the base 100. By supporting the extension 212 of the fixing nut 210 from the bottom, it is prevented from excessively displacing downwards or falling out of the base 100 under the continuous biasing force of the spring 310, ensuring that the adjusting knob 300, the spring 310 and the fixing nut 210 can move stably up and down within a preset stroke, thus ensuring the reliability of the structure.

[0030] like Figure 4 As shown, the first groove 301 has a hexagonal cross-sectional shape, and the locking part 211 of the fixing nut 210 is also hexagonal, matching the cross-sectional shape of the first groove 301. The locking part 211 is slidably disposed in the first groove 301. The cooperation between the hexagonal locking part 211 and the first groove 301 ensures that the rotational force of the adjusting knob 300 can be completely transmitted to the fixing nut 210 and the lifting screw 200, providing a strong constraint in the circumferential direction to prevent relative rotation between the two, and leaving a sliding gap in the axial direction so that the adjusting knob 300 can smoothly move up and down along the fixing nut 210 to achieve the switching between the unlocking and locking states.

[0031] like Figure 3As shown, furthermore, the depth of the first groove 301 is less than the thickness of the adjusting knob 300, and a stepped portion 303 is formed at the bottom of the first groove 301, with the bottom end of the spring 310 abutting against the stepped portion 303. The stepped portion 303 limits the compression stroke of the lower end of the spring 310, ensuring that the bottom end of the spring 310 is restricted to a predetermined position without deviation, thus ensuring the stable application of the preload of the spring 310; at the same time, the rebound force of the spring 310 can act on the entire adjusting knob 300 through the stepped portion 303, driving it to accurately reset.

[0032] like Figure 3 As shown, the base 100 further includes a second groove 101 at its top, and a limiting part 304 at the bottom of the stepped portion 303, which engages with the second groove 101. The second groove 101 provides precise radial positioning for the adjustment knob 300, ensuring that the adjustment knob 300 remains coaxially aligned with the base 100 when pressed down to reset, preventing jamming or uneven friction caused by misalignment.

[0033] Furthermore, existing bone transport external fixation devices have significant rotational errors when adjusting the support upwards using a rotary knob, which may lead to the bone fragments not being able to return to their proper position. In this application, the limiting part 304 is further provided with several protrusions spaced circumferentially on its outer side, and the inner wall of the second groove 101 has several recesses that match the protrusions, with the protrusions engaging within the recesses. Specifically, there are four protrusions spaced circumferentially on the outer side of the limiting part 304, and four recesses spaced circumferentially on the inner wall of the second groove 101. The adjusting knob 300, based on the protrusions and recesses, can be rotated 1 / 4 turn for adjustment; one full turn of the adjusting knob 300 moves the lifting base 500 upwards by 1 mm. Four circumferentially distributed bosses and recesses divide one rotation into four positions. This ensures that every 1 / 4 turn of the adjustment knob 300, the bosses fall into the recesses, generating tactile feedback and effectively preventing the adjustment knob 300 from reversing at any position. This eliminates uncontrollable free travel during adjustment, ensures the accuracy of each lifting increment (1mm per rotation), and avoids bone block positioning deviations caused by rotational errors, ensuring that the bone blocks can be safely and controllably transported to the predetermined position.

[0034] In operation, this embodiment is as follows: When bone fragment movement adjustment is required, the operator directly pulls the adjustment knob 300 upwards, causing it to move upwards against the bias force of the spring 310. At this time, the limiting part 304 at the bottom of the adjustment knob 300 disengages from the second groove 101 of the base 100, and the lower end face of the adjustment knob 300 separates from the top surface of the base 100. Then, the adjustment knob 300 is rotated. Since the adjustment knob 300 is circumferentially engaged with the locking part 211 of the fixing nut 210 through the hexagonal first groove 301, the rotational force drives the fixing nut 210, and the lifting screw 200 moves relative to the fixing nut 210. 0 generates an upward threaded displacement; since the lifting base 500 engages with the lifting screw 200 through the threaded through hole 501 and is restricted from rotation by the guide rail 400, the upward displacement of the lifting screw 200 is converted into the axial displacement of the lifting base 500 along the guide rail 400; after adjustment, the adjusting knob 300 is released, and the restoring force of the spring 310 immediately pushes the adjusting knob 300 down, so that its limiting part 304 is re-engaged into the second groove 101 of the base 100. The boss of the limiting part 304 is engaged in the concave hole of the second groove 101, forming an effective anti-reverse mechanism to ensure the stability of the bone block position.

[0035] In this embodiment, the adjusting knob 300 is circumferentially engaged with the fixing nut 210. The operator can directly complete the adjustment action by lifting and rotating the adjusting knob 300 without the need for tools, simplifying the operation process. After releasing the knob, the spring 310's restoring force can relock the bottom of the adjusting knob 300 with the top of the base 100. Under the biasing force of the spring 310, the bottom of the adjusting knob 300 is pressed against the top of the base body. The circumferential engagement of the bottom of the adjusting knob 300 with the top of the base 100 restricts its rotation, forming an effective anti-reverse mechanism. This avoids the risk of bone retraction caused by accidental loosening during the adjustment process, improves the safety and control accuracy of the bone transfer process, and thus ensures the predictability and reliability of the treatment effect.

[0036] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A bone transport external fixation frame, characterized in that, include: The base has connecting rods fixed on both sides; A lifting screw extends axially through the base and has a fixing nut at its top; the fixing nut includes a snap-fit ​​portion at the top and an extension portion at the bottom. An adjustment knob has a first groove at its top. The locking part is circumferentially locked into the top of the first groove. An annular inner cavity is formed between the extension and the inner wall of the first groove. A spring is sleeved on the outside of the extension. The top of the spring abuts against the bottom of the locking part, and the bottom of the spring abuts against the bottom of the first groove. The bottom of the adjustment knob is circumferentially locked into the top of the base. The guide rail is fixedly connected to the base; The lifting base is slidably mounted on the guide rail; the lifting base is provided with a threaded through hole, and the bottom end of the lifting screw passes through the through hole of the base and is threadedly engaged with the threaded through hole of the lifting base.

2. The bone transport external fixator according to claim 1, characterized in that: A retaining ring is provided on the inner side of the bottom end of the base, and the top of the retaining ring restricts the bottom end of the extension from extending out of the base.

3. The bone transport external fixator according to claim 1, characterized in that: The first groove has a hexagonal cross-sectional shape, and the locking part of the fixing nut is a hexagon that matches the cross-sectional shape of the first groove. The locking part is slidably disposed in the first groove.

4. The bone transport external fixator according to claim 1, characterized in that: The depth of the first groove is less than the thickness of the adjustment knob, and a stepped portion is formed at the bottom of the first groove, with the bottom end of the spring abutting against the stepped portion.

5. The bone transport external fixator according to claim 4, characterized in that: The top of the base has a second groove, and the bottom of the stepped part has a limiting part that is engaged with the second groove.

6. The bone transport external fixator according to claim 5, characterized in that: The limiting part is provided with a number of protrusions spaced apart on its outer circumference, and the inner wall of the second groove is provided with a number of concave holes that match the number of protrusions, and the protrusions are engaged in the concave holes.

7. The bone transport external fixator according to claim 1, characterized in that: The guide rail has two rails, which are fixed to the bottom of the base and located on the left and right sides of the lifting screw, respectively.

8. The bone transport external fixator according to claim 1, characterized in that: At least one first clamping part is slidably connected to the connecting rod, and the first clamping part clamps a first bone needle.

9. The bone transport external fixator according to claim 1, characterized in that: The lifting base is provided with second clamping parts on the left and right sides, and the second clamping parts hold the second bone needles.

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