A modular nested osteotomy segment

Abstract

The modular nested osteotomy segment disclosed in the application relates to the technical field of medical devices and comprises at least two layers of sleeves, the diameters of the sleeves are gradually reduced layer by layer and the sleeves are sequentially nested, the adjacent two layers of sleeves are coaxially arranged and are slidably connected along the axial direction of the sleeves, a positioning mechanism is arranged between the adjacent two layers of sleeves, the positioning mechanism is used for locking the relative axial positions of the adjacent two layers of sleeves, and the outermost sleeve and the innermost sleeve are respectively provided with an adapter structure among all the sleeves, the adapter structure is used for connecting the bone or the prosthesis component after the osteotomy segment is lengthened, in the initial state, all the sleeves are contracted to the shortest length, the overall volume is small, and the implantation into the human body is facilitated, and when lengthening is required, the nested layers of the sleeves can be selectively increased according to the preset total lengthening length.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a modular nested osteotomy segment. Background Technology

[0002] Existing extended osteotomy segments typically employ a single-layer sleeve structure, such as... Figure 1 As shown, it consists of an outer sleeve and an inner rod. The inner rod can slide and extend along the axial direction of the outer sleeve to achieve the extension function. Its extension range is entirely limited by the length of the inner rod: if a large extension range is required, the inner rod must be long enough, resulting in an excessively large overall length at initial implantation, a long surgical incision, a wide area of ​​soft tissue dissection, and difficulty in implantation; if the inner rod is shortened to reduce the initial volume, the extension range is insufficient and cannot meet clinical needs. Furthermore, when it is necessary to extend the osteotomy segment according to the actual surgical situation, due to the limitation of the outer sleeve and inner rod, its extension range is restricted, necessitating the replacement of the osteotomy segment with a matching length, inevitably wasting time and effort. Summary of the Invention

[0003] The purpose of this invention is to provide a modular nested osteotomy segment to solve the problems existing in the prior art. In its initial state, all sleeves are contracted to their shortest length, resulting in a small overall volume that is easy to implant into the human body. When extension is required, the number of nested sleeves can be selectively increased according to the preset total extension length.

[0004] To achieve the above objectives, the present invention provides the following solution: The present invention provides a modular nested osteotomy segment, comprising at least two layers of sleeves, wherein the diameter of each sleeve decreases progressively and they are nested sequentially, and adjacent sleeves are coaxially arranged and slide along the axial direction of the sleeves; A positioning mechanism is provided between two adjacent sleeve layers, which is used to lock the relative axial position of the two adjacent sleeve layers; Of all the sleeves, the outermost sleeve and the innermost sleeve are respectively provided with a transition structure, which is used to connect bone or prosthetic components after the osteotomy segment is extended.

[0005] Optionally, in two adjacent sleeve layers, at least one guide mechanism is provided between the inner wall of the outer sleeve and the outer wall of the inner sleeve. The guide mechanism extends along the axial direction of the sleeve and is used to allow the two adjacent sleeve layers to slide together along the axial direction of the sleeve.

[0006] Optionally, in two adjacent sleeve layers, a plurality of guide mechanisms are provided between the inner wall of the outer sleeve and the outer wall of the inner sleeve, and each guide mechanism is distributed sequentially along the circumference of the sleeve.

[0007] Optionally, the guiding mechanism includes a guide rail and a guide groove, both of which extend along the axial direction of the sleeve. The guide rail is slidably embedded in the guide groove, and the structure of the guide rail and the guide groove are matched.

[0008] Optionally, when multiple guide rails and multiple guide grooves are provided on the same sleeve, each guide rail and each guide groove are distributed sequentially along the circumference of the sleeve, and each guide rail and each guide groove are arranged alternately in the circumferential direction.

[0009] Optionally, the positioning mechanism includes a fixing screw, which is disposed between two adjacent sleeves. A fixing hole is provided on the side wall of the outer sleeve, and the fixing screw passes through the fixing hole and abuts against the outer wall of the adjacent inner sleeve to lock the relative axial position of the two adjacent sleeves.

[0010] Optionally, in two adjacent sleeve layers, the outer wall of the inner sleeve is provided with a plurality of force-bearing structures distributed axially at intervals, and the end of the fixing screw abuts against the corresponding force-bearing structure.

[0011] Optionally, the force-bearing structure has a concave structure.

[0012] Optionally, when the fixing screw passes through the corresponding fixing hole and one end of the fixing screw abuts against the outer wall of the sleeve located in the adjacent inner layer, the other end of the fixing screw does not protrude from the fixing hole.

[0013] Optionally, of all the sleeves, the innermost sleeve is detachably connected to the corresponding adapter structure.

[0014] The present invention achieves the following technical effects compared to the prior art: The modular nested osteotomy segment disclosed in this invention, in its initial state, has all sleeves retracted to their shortest length, resulting in a small overall volume that facilitates implantation into the human body. When extension is required, the number of nested sleeve layers can be selectively increased according to a preset total extension length. Each additional sleeve layer is equivalent to adding an effective extension distance to the original extension range, while the initial compression length remains almost unchanged. This allows the osteotomy segment to achieve a greater extension range within a limited initial compression length. Furthermore, each sleeve layer, after extending, still has sufficient overlap length to maintain cooperation with adjacent sleeves, ensuring the overall structural rigidity and bending resistance after extension. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the structure of an extended osteotomy segment in an example disclosed in the prior art; Figure 2 This is a schematic diagram of the initial state of a modular nested osteotomy segment in an example disclosed in this invention; Figure 3 This is a schematic diagram of the extended state of a modular nested osteotomy segment in an example disclosed in this invention; Figure 4 This is a schematic diagram of the outermost sleeve in an example disclosed in this invention; wherein Figure 4 (a) is a front view of the outermost sleeve; Figure 4 (b) is an isometric view of the outermost sleeve; Figure 5 This is a schematic diagram of the structure of the middle sleeve in an example disclosed in this invention; wherein Figure 5 (a) is a front view of the middle sleeve; Figure 5 (b) is an isometric view of the middle sleeve; Figure 6 This is a schematic diagram of the innermost sleeve in an example disclosed in this invention; Among them, 1-sleeve, 2-fixing screw, 3-force-bearing structure, 4-transfer structure, 5-guide rail, 6-guide groove. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] The purpose of this invention is to provide a modular nested osteotomy segment to solve the problems existing in the prior art. In its initial state, all sleeves are contracted to their shortest length, resulting in a small overall volume that is easy to implant into the human body. When extension is required, the number of nested sleeves can be selectively increased according to the preset total extension length.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] like Figures 2 to 6 As shown, this invention provides a modular nested osteotomy segment, comprising at least two layers of sleeves 1. The sleeves 1 can be made of medical-grade stainless steel, titanium alloy, or cobalt-chromium alloy, commonly used metal materials for orthopedic implants, or medical-grade polymer materials. The diameter of each sleeve 1 decreases progressively and they are nested sequentially. Adjacent sleeves 1 are coaxially aligned and slide along the axial direction of the sleeve 1. The number of sleeve layers 1 can be flexibly increased or decreased according to the required extension length in clinical practice. For example, for osteotomy cases requiring a 30mm extension, a three-layer sleeve structure can be used, with each layer having an effective extension distance of 10mm, resulting in a total extension of 30mm when fully extended. For complex cases requiring a 50mm extension, up to five layers of sleeves 1 can be used, with each layer still having an effective extension distance of 10mm, and the initial compressed length remaining close to the compressed length of three layers of sleeves 1.

[0021] In some cases, the cross-sectional shape of sleeve 1 is circular, and circumferential positioning between sleeves 1 is achieved through a guide mechanism. In other cases, the cross-sectional shape of sleeve 1 is polygonal, such as hexagonal or octagonal. The polygonal cross-section itself can provide circumferential positioning function, which can simplify the design of the guide mechanism.

[0022] A positioning mechanism is provided between adjacent sleeves 1 to lock the relative axial position of the two adjacent sleeves 1. Among all sleeves 1, the outermost sleeve 1 and the innermost sleeve 1 are respectively provided with a transition structure 4, which is used to connect bone or prosthetic components after the osteotomy segment is lengthened. As a preferred example, the outermost sleeve 1 and the corresponding transition structure 4 are integrally formed, suitable for load-bearing parts that bear large loads. Of course, the outermost sleeve 1 and the corresponding transition structure 4 are fixed by welding or detachable connection. The detachable connection allows for the replacement of different specifications of the transition structure 4 during surgery according to the lengthening requirements.

[0023] The modular nested osteotomy segment disclosed in this invention, in its initial state, has all sleeves 1 retracted to their shortest length, resulting in a small overall volume that facilitates implantation into the human body. When extension is required, the number of nested layers of sleeves 1 can be selectively increased according to a preset total extension length. Each additional layer of sleeve 1 is equivalent to adding an effective extension distance to the original extension range, while the initial compression length remains almost unchanged. This allows the osteotomy segment to achieve a greater extension range within a limited initial compression length. Furthermore, each layer of sleeve 1, after extending, still has sufficient overlap length to maintain cooperation with adjacent sleeves 1, ensuring the overall structural rigidity and bending resistance after extension.

[0024] In one embodiment, in two adjacent sleeves 1, at least one guide mechanism is provided between the inner wall of the outer sleeve 1 and the outer wall of the inner sleeve 1. The guide mechanism extends along the axial direction of the sleeve 1 and is used to allow the two adjacent sleeves 1 to slide in the axial direction of the sleeve 1. The guide mechanism ensures that the adjacent sleeves 1 remain coaxial when sliding relative to each other, avoiding misalignment or jamming.

[0025] In some examples, the guide mechanism is located in the middle section of the inner wall of the outer sleeve, with a cylindrical mating section without the guide mechanism at each end. When the inner sleeve 1 is in the retracted state, the guide mechanism provides axial guidance and circumferential positioning; when the inner sleeve 1 is fully extended, the cylindrical mating section at the end forms a tight circumferential contact with the outer wall of the inner sleeve, providing stable radial support for the end of the sleeve 1. In other examples, the guide mechanism extends through the entire axial length of the inner wall of the outer sleeve, providing full-length guidance for the inner sleeve 1. The guide mechanism remains engaged at any position of the inner sleeve 1 from retracted to fully extended, ensuring an uninterrupted guiding path and smooth, wobbly sliding throughout. Alternatively, the guide mechanism can also be located near both ends of the inner wall of the outer sleeve, with a cylindrical mating section in the middle.

[0026] In one embodiment, in two adjacent sleeves 1, a plurality of guide mechanisms are provided between the inner wall of the outer sleeve 1 and the outer wall of the inner sleeve 1, and the guide mechanisms are distributed sequentially along the circumference of the sleeve 1. For example, the number of guide mechanisms is three, evenly distributed along the circumference of the sleeve 1, and the central angle between two adjacent guide mechanisms is 120 degrees. Alternatively, the number of guide mechanisms is four, evenly distributed along the circumference of the sleeve 1, and the central angle between two adjacent guide mechanisms is 90 degrees. Of course, the number of guide mechanisms can also be six, or two, etc., and is not limited.

[0027] The number of guiding mechanisms directly affects the uniformity of circumferential constraint and torsional resistance. A greater number results in more precise circumferential positioning and higher overall structural rigidity of the extended sleeve 1. However, it should be noted that increasing the number of guiding mechanisms increases sliding friction resistance; therefore, a balance must be struck between guiding accuracy and ease of operation in practical applications.

[0028] In one embodiment, the guiding mechanism includes a guide rail 5 and a guide groove 6, both extending along the axial direction of the sleeve 1. The guide rail 5 is slidably embedded in the guide groove 6, and the structures of the guide rail 5 and the guide groove 6 are matched. This matching design of the guide rail 5 and the guide groove 6 not only provides precise axial guidance for the telescopic movement of the sleeve 1 but also restricts the relative rotation between adjacent sleeves 1 in the circumferential direction. This protruding and recessed matching structure also increases the structural strength of the sleeve 1, making the thin-walled sleeve 1 less prone to deformation under bending or torsional loads, and significantly improving the overall stiffness and stability of the extended osteotomy segment. Based on this embodiment, the cross-sectional shape of the guide rail 5 and the guide groove 6 can be rectangular, trapezoidal, or dovetail-shaped.

[0029] More preferably, the guide rails 5 and guide grooves 6 have rectangular cross-sectional shapes. Rectangular cross-sections are easy to process, and the clearance between the guide rails 5 and guide grooves 6 between adjacent sleeves 1 is uniform, ensuring smooth sliding. More importantly, since each layer of sleeves 1 has been pre-prepared, each layer of sleeve 1 has a preset number of guide rails 5 and / or guide grooves 6, and the number and position of the guide rails 5 and guide grooves 6 in each layer of sleeves 1 are uniform, the guide rails 5 and guide grooves 6 between adjacent layers have formed a definite mating relationship. When it is necessary to increase or decrease the number of sleeve layers 1 according to the actual lengthening requirements during the operation, the doctor can directly and quickly select the sleeve 1 with the corresponding diameter specification from the pre-made sleeves 1 and directly perform nesting assembly without adjusting the mating parameters or reprocessing the mating surfaces on site, making it highly operable and adaptable.

[0030] In some cases, the guide rail 5 is located on the inner wall of the outer sleeve 1, and the guide groove 6 is located on the outer wall of the inner sleeve 1. In other cases, the guide rail 5 is located on the outer wall of the inner sleeve 1, and the guide groove 6 is located on the inner wall of the outer sleeve 1. Of course, both the guide rail 5 and the guide groove 6 are present on the same layer of sleeve 1, forming a complementary fit with the adjacent sleeve 1.

[0031] As a preferred example, the surfaces of guide rail 5 and guide groove 6 are polished to reduce sliding friction resistance. The surfaces of guide rail 5 and guide groove 6 may also be treated with nitriding or diamond-like coating to improve surface hardness and wear resistance.

[0032] In one embodiment, when multiple guide rails 5 and multiple guide grooves 6 are provided on the same sleeve 1, each guide rail 5 and each guide groove 6 is distributed sequentially along the circumference of the sleeve 1, and the guide rails 5 and each guide groove 6 are arranged alternately in the circumferential direction. The alternating arrangement of the guide rails 5 and guide grooves 6 ensures that the sleeve 1 is subjected to uniform constraint force in the circumferential direction, avoiding deformation or jamming caused by concentrated force on one side. Moreover, this uniformly distributed mating structure creates multi-point support between the extended layers of sleeve 1, significantly improving the overall bending stiffness and torsional resistance.

[0033] In one embodiment, the positioning mechanism includes a fixing screw 2, which is disposed between two adjacent sleeves 1. A fixing hole is formed on the side wall of the outer sleeve 1, through which the fixing screw 2 passes and abuts against the outer wall of the adjacent inner sleeve 1, thereby locking the relative axial position of the two adjacent sleeves 1. By locking with the fixing screw 2, the extension amount of each sleeve 1 can be precisely set during surgery according to the actual lengthening requirements, achieving precise adjustment. The multiple fixing holes provide a more flexible adjustment range, allowing the same osteotomy segment to adapt to the lengthening needs of different patients without changing instruments or reopening holes during surgery.

[0034] In some cases, the fixing screw 2 is a headless screw, and the fixing hole is a threaded hole, with the fixing screw 2 engaging with the threaded hole. In other cases, the fixing screw 2 is a countersunk screw, with a countersunk groove on the outer opening of the fixing hole, and the tapered head of the countersunk screw engaging with the countersunk groove.

[0035] The fixing holes are located at the end of the outer sleeve 1 where the inner sleeve 1 extends. The end locking position is close to the open end of the sleeve 1, and the fixing screw 2 locks in place after the sleeve 1 is fully extended. Alternatively, the fixing holes are distributed in both the middle and end sections of the outer sleeve 1. The middle section locking is suitable for the intermediate state when the inner sleeve 1 is partially extended, while the end locking is suitable for the final state when the inner sleeve 1 is fully extended, allowing the surgeon to flexibly choose the locking position during the operation according to the actual situation.

[0036] In one embodiment, in two adjacent sleeve layers 1, the outer wall of the inner sleeve 1 is provided with multiple axially spaced force-bearing structures 3, and the end of the fixing screw 2 abuts against the corresponding force-bearing structure 3. The force-bearing structure 3 provides an abutment position for the fixing screw 2, which ensures the reliability of locking and avoids the end of the fixing screw 2 from causing indentation or damage to the outer wall of the inner sleeve. The multiple force-bearing structures 3 are distributed axially, allowing the doctor to select a suitable locking position according to the actual extension amount.

[0037] As a preferred example, the force-bearing structure 3 is a concave structure with equal spacing along the axial direction. The spacing between adjacent concave pits is consistent with the spacing of the fixing holes on the outer sleeve 1, so as to ensure that the end of the fixing screw 2 can accurately fall into the corresponding concave pit when tightened. The concave structure can be a spherical concave pit, a conical concave pit, or an arc-shaped groove, etc. The concave structure allows the end of the fixing screw 2 to be embedded in it, forming a reliable positioning and locking, preventing the fixing screw 2 from slipping and loosening when subjected to vibration or load, and ensuring long-term stability in the extended state.

[0038] In one embodiment, the fixing screw 2 passes through the corresponding fixing hole. When one end of the fixing screw 2 abuts against the outer wall of the sleeve 1 located in the adjacent inner layer, the other end of the fixing screw 2 does not protrude from the fixing hole. The fixing screw 2 not protruding from the fixing hole avoids friction or damage between the screw tip and surrounding soft tissue, improving post-implantation comfort and safety. Simultaneously, flush installation reduces the risk of accidental loosening of the screw tip due to contact with the outside environment, ensuring long-term implantation reliability.

[0039] After the fixing screw 2 is fully tightened, its end face is flush with the outer wall surface of the outer sleeve 1, or slightly lower than the outer wall surface of the outer sleeve 1 by 0.1mm to 0.5mm, forming a slight indentation. Based on this, a protective ring is provided at the outer opening of the fixing hole. The protective ring is made of a material softer than the base of the sleeve 1. After the fixing screw 2 is tightened, the protective ring slightly deforms to fill the gap between the screw and the fixing hole. This protective ring design ensures that the screw does not protrude while also providing a certain degree of sealing to prevent bodily fluids or tissue fluids from seeping into the fixing hole.

[0040] In one embodiment, the innermost sleeve 1 is detachably connected to the corresponding adapter structure 4. This detachable connection allows surgeons to flexibly select different specifications or types of adapter structures 4 based on the specific anatomical structure and fixation requirements of the patient's bones, improving the clinical adaptability and application flexibility of the osteotomy segment. The detachable design also facilitates intraoperative replacement and postoperative revision, reducing the difficulty and trauma of reoperation.

[0041] As a preferred example, the innermost sleeve 1 and the corresponding adapter structure 4 are connected by threads. For instance, the proximal end of the innermost sleeve 1 has an internal threaded hole, and one end of the adapter structure 4 has an external thread; the two are detachably connected by threaded engagement. Alternatively, the innermost sleeve 1 and the corresponding adapter structure 4 are connected by a snap-fit ​​connection. The proximal end of the innermost sleeve 1 has an elastic claw, and one end of the adapter structure 4 has a slot; the two are quickly assembled and disassembled by the engagement of the claw and the slot.

[0042] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0043] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0044] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A modular nested osteotomy segment, characterized in that, It includes at least two layers of sleeves, the diameter of each sleeve decreases layer by layer and they are nested in sequence, and adjacent two layers of sleeves are coaxially arranged and slidingly fitted along the axial direction of the sleeves; A positioning mechanism is provided between two adjacent sleeve layers, which is used to lock the relative axial position of the two adjacent sleeve layers; Of all the sleeves, the outermost sleeve and the innermost sleeve are respectively provided with a transition structure, which is used to connect bone or prosthetic components after the osteotomy segment is extended.

2. The modular nested osteotomy segment according to claim 1, characterized in that, In the two adjacent sleeve layers, at least one guide mechanism is provided between the inner wall of the outer sleeve and the outer wall of the inner sleeve. The guide mechanism extends along the axial direction of the sleeve and is used to allow the two adjacent sleeve layers to slide together along the axial direction of the sleeve.

3. The modular nested osteotomy segment according to claim 2, characterized in that, In two adjacent sleeve layers, a plurality of guide mechanisms are provided between the inner wall of the outer sleeve and the outer wall of the inner sleeve, and each guide mechanism is distributed sequentially along the circumference of the sleeve.

4. The modular nested osteotomy segment according to claim 2, characterized in that, The guiding mechanism includes a guide rail and a guide groove, both of which extend along the axial direction of the sleeve. The guide rail is slidably embedded in the guide groove, and the structure of the guide rail and the guide groove are matched.

5. The modular nested osteotomy segment according to claim 4, characterized in that, When multiple guide rails and multiple guide grooves are provided on the same sleeve, each guide rail and each guide groove are distributed sequentially along the circumference of the sleeve, and each guide rail and each guide groove are arranged alternately in the circumferential direction.

6. The modular nested osteotomy segment according to claim 1, characterized in that, The positioning mechanism includes a fixing screw, which is disposed between two adjacent sleeves. A fixing hole is provided on the side wall of the outer sleeve, and the fixing screw passes through the fixing hole and abuts against the outer wall of the adjacent inner sleeve to lock the relative axial position of the two adjacent sleeves.

7. The modular nested osteotomy segment according to claim 6, characterized in that, In the two adjacent sleeve layers, the outer wall of the inner sleeve is provided with a plurality of force-bearing structures distributed axially at intervals, and the end of the fixing screw abuts against the corresponding force-bearing structure.

8. The modular nested osteotomy segment according to claim 7, characterized in that, The stress-bearing structure has a concave surface.

9. The modular nested osteotomy segment according to claim 6, characterized in that, When the fixing screw passes through the corresponding fixing hole, and one end of the fixing screw abuts against the outer wall of the sleeve located in the adjacent inner layer, the other end of the fixing screw does not protrude out of the fixing hole.

10. The modular nested osteotomy segment according to claim 1, characterized in that, Of all the sleeves, the innermost sleeve is detachably connected to the corresponding adapter structure.

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