Z-shaped guiding osteotomy device for correcting foot eversion

Abstract

This application provides a Z-shaped guided osteotomy device for hallux valgus correction. The guided osteotomy device includes a Z-shaped integrated guide blade, a pair of alignment channels, and a handle. The guide blade includes a long arm segment and short arm segments at both ends of the long arm segment. The included angle between the long arm segment and the short arm segments is 60°-80°. The guide trajectories defined by the long arm segment and the short arm segments together constitute the spatial guide path for the Z-shaped osteotomy. The pair of alignment channels are centrally symmetrically arranged with respect to the longitudinal center of the long arm segment, and the axis of the alignment channels is perpendicular to the bone surface of the first metatarsal. The above device enables precise three-dimensional spatial control of the osteotomy position, angle, and direction, reducing reliance on the surgeon's personal experience, standardizing the results of complex orthopedic surgeries, and completing the Z-shaped osteotomy in one operation through the spatial guide path. This reduces the operation time, shortens the high-temperature friction time between the guide blade and the bone, avoids the risk of thermal damage to local bone tissue, and facilitates postoperative recovery for the patient.

Description

Technical Field

[0001] This application relates to the field of novel medical device technology, and in particular to a Z-shaped guided osteotomy device for hallux valgus correction. Background Technology

[0002] Hallux valgus is a common foot deformity, mainly characterized by the big toe deviating outwards and the first metatarsal bone turning inwards, often leading to pain and difficulty walking. Currently, the main surgical methods for correcting hallux valgus include: Chevron osteotomy (V-shaped osteotomy) and Scarf osteotomy (Z-shaped osteotomy). For severe hallux valgus, Scarf osteotomy is generally performed on the metatarsal shaft using a "Z"-shaped osteotomy, allowing for three-dimensional adjustments (displacement, rotation, and elevation). It has strong corrective capabilities and is currently a very popular surgical technique.

[0003] However, in traditional surgical procedures, the angle, position, and depth of the Z-shaped osteotomy are entirely determined by the surgeon's experience through visual estimation and manual manipulation during the operation. The accuracy of the osteotomy is highly dependent on the surgeon's experience and feel. The success of the surgery largely depends on the surgeon's understanding of individual anatomical variations and their ability to adapt to changing circumstances. Furthermore, it is difficult to achieve stable and repeatable excellent results across different hospitals and doctors. In addition, repeated instrument adjustments and trial osteotomies can cause local thermal damage, affecting bone healing.

[0004] In view of this, it is necessary to design a Z-shaped guided osteotomy device for hallux valgus correction to solve one of the above problems. Summary of the Invention

[0005] This application provides a Z-shaped guided osteotomy device for hallux valgus correction, which can realize the precision and standardization of hallux valgus osteotomy correction surgery, reduce the operation time and the impact of the operation on the patient, and facilitate the patient's postoperative recovery.

[0006] To achieve the above objectives, the technical solution provided in this application is as follows: This application provides a Z-shaped guided osteotomy device for hallux valgus correction, wherein the Z-shaped guided osteotomy device includes: The Z-shaped integrated guide blade includes a long arm segment and short arm segments at both ends of the long arm segment. The included angle between the long arm segment and the short arm segments is 60°-80°. The guide trajectories defined by the long arm segment and the short arm segments together constitute the spatial guide path of the Z-shaped osteotomy. A pair of positioning channels are respectively located at the corner where the long arm segment and the short arm segment meet, and are centrally symmetrical about the longitudinal center of the long arm segment. The positioning channel is configured such that its axis is perpendicular to the bone surface of the first metatarsal bone. The handle is fixedly connected to the proximal end of the guide blade, and the axis of the handle is parallel to and spaced apart from the axis of the positioning channel.

[0007] Furthermore, the two short arm segments are of equal length, and the angle between the two short arm segments and the long arm segment is the same. The two short arm segments are arranged in a centrally symmetrical manner with respect to the longitudinal center of the long arm segment.

[0008] Furthermore, the two short arm segments are of unequal length, and / or the angles between the two short arm segments and the long arm segment are different, in order to accommodate the asymmetrical orthopedic needs of the proximal and distal metatarsal bones.

[0009] Furthermore, the extension length of the long arm segment is 10mm-15mm, and the extension length of the short arm segment is 3mm-5mm.

[0010] Furthermore, the width of the guide blade is 20mm-35mm, and the thickness of the guide blade is 0.5mm-1mm.

[0011] Furthermore, the guide blade has depth scale markings evenly spaced along its width direction.

[0012] Furthermore, the inner diameter of the positioning channel is 1.5mm-2.0mm. Furthermore, it also includes a connection portion connecting the handle and the guide blade, wherein, in the proximal-to-distal direction, the positioning channel has a first segment extending through the connection portion and a second segment located between the connection portion and the patient's bone surface, the second segment being located at the corner of the long arm segment and the short arm segment.

[0013] Furthermore, the thickness of the connecting portion gradually decreases, and the inner surface of the connecting portion and the inner surface of the guide blade are smoothly connected.

[0014] Furthermore, it also includes a base fixed to the proximal end of the handle, wherein the maximum outer contour dimension of the cross-section of the base is greater than the outer diameter dimension of the handle.

[0015] Compared with related technologies, the beneficial effects of this application are as follows: By utilizing the Z-shaped guided osteotomy device for hallux valgus correction, precise three-dimensional spatial control of the osteotomy position, angle, and direction is achieved, reducing reliance on the surgeon's personal experience, eliminating the main source of deviation in traditional freehand operation, standardizing the results of complex orthopedic surgery, and completing the Z-shaped osteotomy in one go through the spatial guidance path, reducing operation time, shortening the high-temperature friction time between the guide blade and the bone, avoiding the risk of thermal damage to local bone tissue and bone loss, and facilitating postoperative recovery for patients. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the Z-shaped guided osteotomy device for hallux valgus correction in this application.

[0017] Figure 2 yes Figure 1 Bottom view of the center-guided osteotomy device.

[0018] Among them, 10-guide blade, 11-short arm section, 12-long arm section, 20-positioning channel, 30-handle, 40-connecting part, 50-base. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0020] In the various figures of this application, for ease of illustration, certain dimensions of structures or parts may be exaggerated relative to other structural parts; therefore, they are only used to illustrate the basic structure of the subject matter of this application.

[0021] For ease of explanation, the Z-shaped guided osteotomy device for hallux valgus correction in this application is defined as follows: the end closer to the surgeon is the proximal end, the end closer to the patient is the distal end, the side closer to the big toe is the medial side, and the side closer to the little toe is the lateral side.

[0022] This application provides a Z-shaped guided osteotomy device for hallux valgus correction, such as... Figure 1 and Figure 2 As shown, the Z-shaped guided osteotomy device includes a guide blade 10, a pair of positioning channels 20, and a handle 30 fixedly connected to the proximal end of the guide blade 10. The guided osteotomy device is attached to the bone surface on the medial side of the distal end of the first metatarsal bone.

[0023] like Figure 2 As shown, the integrated guide blade 10 is Z-shaped, including a long arm segment 11 and short arm segments 12 at both ends of the long arm segment 11. The two short arm segments 12 extend in opposite directions, and the included angle between the long arm segment 11 and the short arm segment 12 is 60°-80°. The guide trajectory defined by the long arm segment 11 and the short arm segment 12 together constitutes the spatial guide path of the Z-shaped osteotomy, providing precise positioning for the osteotomy procedure.

[0024] Specifically, the cutting edges of the long arm segment 11 and the short arm segment 12 are aligned with the bone surface of the patient's first metatarsal. A Z-shaped osteotomy is cut in one go along the extension direction of the long arm segment 11 and the short arm segment 12, reducing the number of osteotomy operations and the operation time. This fundamentally shortens the high-temperature friction time between the guide blade 10 and the bone. Due to the large oscillation amplitude, the bone loss will also increase. The guide blade 10 of this application avoids the risk of thermal damage to local bone tissue and bone loss to the greatest extent, which is beneficial to the patient's postoperative recovery.

[0025] The optimal angle design between the long arm segment 11 and the short arm segment 12 can balance the dual needs of correction and stability, avoiding the risk of instability caused by too small an angle and the risk of loss of correction ability caused by too large an angle. This device ensures that this optimal angle can be accurately reproduced in every operation through the precise guide blade 10.

[0026] For special patients, a custom-designed curved surface can be made at the distal end of the long arm segment 11 and the short arm segment 12 to conform to the bone surface of the first metatarsal, based on the actual condition of the bone surface of the first metatarsal. The conformity of the long arm segment 11 and the short arm segment 12 to the bone surface of the first metatarsal effectively prevents displacement during hammering or osteotomy, thereby ensuring that the osteotomy position and angle are completely consistent with the pre-set, greatly improving the precision of the surgery.

[0027] The extended length of the long arm segment 11 is 10mm-15mm, and the extended length of the short arm segment 12 is 3mm-5mm. During the operation, the osteotomy lines corresponding to the two short arm segments 12 are located at the proximal and distal ends of the metatarsal bones, while the long arm segment 11 extends along the shaft of the first metatarsal bone, providing the main bone contact area and length, responsible for bearing most of the postoperative stress and preventing proximal displacement of the bone fragments; together, they constitute a biomechanically optimal stable structure, preserving bone to the maximum extent and ensuring minimal invasiveness to the distal soft tissues during the operation.

[0028] The width of the guide blade 10 is 20mm-35mm. This width is defined as the distance from the proximal end to the distal end of the guide blade 10. Generally speaking, the width (inner and outer diameter) of the first metatarsal bone is between 15mm and 25mm. The blade width of 20mm-35mm in this application can completely cover and exceed this width, ensuring that the guide blade 10 can cut through the cross-section of the first metatarsal bone to complete the effective osteotomy, while providing the necessary safety margin to prevent excessive damage. While ensuring the rigidity of the instrument structure, it also takes into account the exposure of the surgical field and the convenience of operation.

[0029] The thickness of the guide blades 10 is 0.5mm-1mm, which ensures that the guide blades 10 achieve the best balance between rigidity and toughness. The blades need to be thick enough to resist bending deformation, ensuring that their preset angle and guide path do not change during the hammering and bone cutting process.

[0030] The guide blade 10 features depth markings evenly spaced along its width. This facilitates real-time monitoring of the bone cut depth along the guide path during surgery, enabling visualization and precise control of the osteotomy depth.

[0031] As a preferred embodiment of this application, such as Figure 2 As shown, the two short arm segments 12 are of equal length, and the angles between the two short arm segments 12 and the long arm segment 11 are the same. The two short arm segments 12 are symmetrically arranged about the longitudinal center of the long arm segment 11. The centrally symmetrical design of the guide blade 10 in this embodiment eliminates the need to distinguish directions during surgery, reducing the risk of operational errors. The symmetrical structure provides a balanced force transmission path, enhancing the stability and precision of the osteotomy process.

[0032] Understandably, in actual hallux valgus osteotomy, the surgeon can also adjust the position of the positioning channel 20 according to the specific condition of the patient's metatarsals, and thus adjust the length of the short arm segment 12 involved in the osteotomy, so as to accurately correspond to the anatomical structure of the proximal and distal ends of the metatarsals.

[0033] In another preferred embodiment of this application, the two short arm segments 12 are of unequal length, and / or the angles between the two short arm segments 12 and the long arm segment 11 are different, to accommodate the asymmetrical corrective needs of the proximal and distal metatarsal bones. The asymmetrical design of the guide blade 10 in this embodiment can be used for complex cases with both extreme metatarsal varus and rotational deformities. This design allows for extensive displacement in the proximal metatarsal shaft to achieve biomechanical correction, while simultaneously enabling precise joint orientation adjustment in the distal metatarsal head-neck region, achieving the optimal balance between deformity correction and joint preservation.

[0034] A pair of positioning channels 20 are respectively located at the corner where the long arm segment 11 and the short arm segment 12 meet, and are centrally symmetrical about the longitudinal center of the long arm segment 11, so that the guide osteotomy device is a dual-point positioning system, which can prevent the guide blade 10 from rotating and shifting laterally during the operation, and ensure that the osteotomy surface is generated accurately along the preoperatively planned path.

[0035] The positioning channel 20 is configured such that its axis is perpendicular to the bone surface of the first metatarsal bone. The positioning channel 20 is used for the positioning needle to pass through, so that the positioning needle is implanted into the bone at the optimal angle, thereby achieving stable fixation of the guiding osteotomy device.

[0036] The axis of the positioning channel 20 is parallel to the straight line where the long arm segment 11 and the short arm segment 12 connect, ensuring the accuracy of the guidance of the long arm segment 11 and the short arm segment 12 during the osteotomy process. Preferably, the inner diameter of the positioning channel 20 is 1.5mm-2.0mm, which can allow the positioning pin to pass through smoothly while also meeting the requirements of positioning accuracy. The handle 30 is fixedly connected to the proximal end of the guide blade 10, and the axis of the handle 30 is parallel and spaced apart from the axis of the positioning channel 20. The handle 30 is fixed to the longitudinal center of the long arm segment 11, so that the axis of the handle 30 is parallel and spaced apart from the axis of the positioning channel 20. This design separates the handle 30 from the positioning needle (osteotomy area) in space, avoiding accidental collision of the surgeon's hand or hammer with the implanted positioning needle, reducing the risk of instrument slippage or secondary injury, and also preventing the handle 30 from obstructing the surgical field of vision, which is in line with the ergonomic optimization design.

[0037] The handle 30 is cylindrical with an outer diameter of 10mm-15mm and a length of 100mm-150mm. The specifications of the handle 30 take into account both the surgeon's stable grip and sensitive touch, thereby improving the controllability of the surgery.

[0038] In another preferred embodiment of this application, the guide osteotomy device further includes a connecting portion 40 that connects the handle 30 and the guide blade 10. The thickness of the connecting portion 40 gradually decreases in the direction from the proximal end to the distal end, and the inner surface of the connecting portion and the inner surface of the guide blade 10 are smoothly connected, which can increase the structural strength of the guide osteotomy device.

[0039] In this embodiment, the positioning channel 20 extends distally and penetrates the connecting portion 40. Specifically, the positioning channel 20 has a first segment penetrating the connecting portion 40 and a second segment located between the connecting portion 40 and the patient's bone surface. The second segment is located at the corner between the long arm segment and the short arm segment, at the distal end of the positioning needle, providing a wide field of view and facilitating precise control of the positioning needle for positioning.

[0040] The guiding osteotomy device also includes a base 50 fixed to the proximal end of the handle 30. The maximum outer contour dimension of the cross-section of the base 50 is larger than the outer diameter dimension of the handle 30, which facilitates the surgeon to control the guiding osteotomy device well during the operation and makes it convenient to use a hammer to strike, so as to complete the operation smoothly.

[0041] In summary, the Z-shaped guided osteotomy device for hallux valgus correction of this application achieves precise three-dimensional spatial control of the osteotomy position, angle, and direction, reducing reliance on the surgeon's personal experience, eliminating the main source of deviation in traditional freehand operation, standardizing the results of complex corrective surgeries, and completing the Z-shaped osteotomy in one go through the spatial guidance path, reducing operation time, shortening the high-temperature friction time between the guide blade and the bone, avoiding the risk of thermal damage to local bone tissue, and facilitating postoperative recovery for patients. It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0042] The detailed descriptions listed above are merely specific illustrations of feasible embodiments of this application and are not intended to limit the scope of protection of this application. All equivalent embodiments or modifications made without departing from the spirit of the art of this application should be included within the scope of protection of this application.

Claims

1. A Z-shaped guided osteotomy device for hallux valgus correction, characterized in that, The guiding osteotomy device includes: The Z-shaped integrated guide blade includes a long arm segment and short arm segments at both ends of the long arm segment. The included angle between the long arm segment and the short arm segments is 60°-80°. The guide trajectories defined by the long arm segment and the short arm segments together constitute the spatial guide path of the Z-shaped osteotomy. A pair of positioning channels are respectively located at the corner where the long arm segment and the short arm segment meet, and are centrally symmetrical about the longitudinal center of the long arm segment. The positioning channel is configured such that its axis is perpendicular to the bone surface of the first metatarsal bone. The handle is fixedly connected to the proximal end of the guide blade, and the axis of the handle is parallel to and spaced apart from the axis of the positioning channel.

2. The Z-shaped guided osteotomy device for hallux valgus correction as described in claim 1, characterized in that, The two short arm segments are of equal length and have the same angle with the long arm segment. The two short arm segments are arranged in a centrally symmetrical manner with respect to the longitudinal center of the long arm segment.

3. The Z-shaped guided osteotomy device for hallux valgus correction as described in claim 1, characterized in that, The two short arm segments are of unequal length, and / or the angles between the two short arm segments and the long arm segment are different, in order to accommodate the asymmetrical orthopedic needs of the proximal and distal metatarsal bones.

4. The Z-shaped guided osteotomy device for hallux valgus correction as described in claim 1, characterized in that, The extension length of the long arm segment is 10mm-15mm, and the extension length of the short arm segment is 3mm-5mm.

5. The Z-shaped guided osteotomy device for hallux valgus correction as described in claim 1, characterized in that, The width of each guide blade is 20mm-35mm, and the thickness of each guide blade is 0.5mm-1mm.

6. The Z-shaped guided osteotomy device for hallux valgus correction as described in claim 5, characterized in that, The guide blade has depth scale markings evenly spaced along its width.

7. The Z-shaped guided osteotomy device for hallux valgus correction as described in claim 1, characterized in that, The inner diameter of the positioning channel is 1.5mm-2.0mm.

8. The Z-shaped guided osteotomy device for hallux valgus correction as described in any one of claims 1 to 7, characterized in that, It also includes a connection portion connecting the handle and the guide blade, wherein, in the proximal-to-distal direction, the positioning channel has a first segment extending through the connection portion and a second segment located between the connection portion and the patient's bone surface, the second segment being located at the corner of the long arm segment and the short arm segment.

9. The Z-shaped guided osteotomy device for hallux valgus correction as described in claim 8, characterized in that, The thickness of the connecting part gradually decreases, and the inner surface of the connecting part and the inner surface of the guide blade are smoothly connected.

10. The Z-shaped guided osteotomy device for hallux valgus correction as described in any one of claims 1 to 7, characterized in that, It also includes a base fixed to the proximal end of the handle, wherein the maximum outer contour dimension of the cross-section of the base is greater than the outer diameter dimension of the handle.

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