Fixture and trolley replacement system

Abstract

This invention provides a fixation device and a trochlear replacement system. The fixation device includes a fixation member and a self-locking member mounted on the fixation member. The fixation member includes a fixation head, a fixation rod, and a fixation tail connected sequentially from proximal to distal end. The proximal end of the fixation head is used to mount on the distal end of the trochlear prosthesis, and the distal end of the fixation head is connected to the proximal end of the fixation rod. The distal end of the fixation tail is used to insert into the bone to be replaced by the trochlear prosthesis. The distal end of the self-locking member is mounted on the fixation rod, and the proximal end of the self-locking member protrudes radially outward along the fixation rod. The trochlear replacement system includes a trochlear prosthesis and at least one of the fixation devices described above, the fixation device being mounted on the distal end of the trochlear prosthesis. This invention can not only effectively improve the efficiency of surgical operations and reduce the difficulty of surgical operations, but also effectively reduce surgical costs.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a fixation device and a trolley replacement system. Background Technology

[0002] Pets have been human companions since ancient times, even becoming family members and relatives in our lives. However, pets, especially dogs, can suffer from serious joint diseases just like humans. Currently, patellofemoral joint disease is very common clinically worldwide, with high incidence in small breeds such as Poodles, Pomeranians, Chihuahuas, and Yorkshire Terriers, as well as medium and large breeds such as Huskies, Alaskan Malamutes, Golden Retrievers, Labradors, and German Shepherds.

[0003] Patellar trochlear replacement (PGR) is an effective treatment for patellofemoral joint disorders. First introduced in 2009, its indications include chronic or severe patellar dislocation, severe articular cartilage loss, severe degenerative osteoarthritis, severe trochlear malformation (trochlear flattening), severe complex trochlear fractures, and cruciate ligament rupture repair. Pets treated with PGR can quickly regain normal activity, with good postoperative results, few complications, and low risk; therefore, PGR is a very effective treatment method.

[0004] In existing patellar trochlear replacement surgery, the trochlear replacement system consists of two parts. The first part is a porous base plate, which is fixed to the femur using screws. The other part is the trochlear prosthesis, which is connected to the base plate mainly by three conical protrusions that are directly pressed and fixed to the base plate. Although this trochlear replacement system has been widely used and can achieve good results, its complex structure not only affects the efficiency of the surgical procedure and increases the difficulty of the operation, but also makes fixation inconvenient, results in poor stability, and is costly.

[0005] It should be noted that the information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a fixation device and a trochlear replacement system, which can solve the problems of existing trochlear replacement systems that use a base plate and screws for fixation. These systems have complex structures, which not only affect the efficiency of surgical operations and make the surgery more difficult, but also have inconvenient fixation, poor stability, and high costs.

[0007] To solve the above-mentioned technical problems, the present invention provides a fixation device for fixing a trochlear prosthesis to the bone to be replaced by a trochlear prosthesis. The fixation device includes a fixation component and a self-locking component installed on the fixation component.

[0008] The fixation device comprises a fixation head, a fixation rod, and a fixation tail connected in sequence from proximal to distal. The proximal end of the fixation head is used to be installed on the distal end of the trochlear prosthesis. The distal end of the fixation head is connected to the proximal end of the fixation rod. The distal end of the fixation tail is used to be inserted into the bone to be replaced by the trochlear prosthesis.

[0009] The distal end of the self-locking component is mounted on the fixing rod, and the proximal end of the self-locking component protrudes outward along the radial direction of the fixing rod.

[0010] Optionally, the fixing head is provided with external threads, and the fixing head is used to be installed on the distal end of the trochlear prosthesis by means of threaded connection.

[0011] Optionally, the outer surface of the fixing rod is provided with a groove that cooperates with the self-locking component.

[0012] Optionally, the slot includes an annular groove arranged circumferentially along the outer surface of the fixing rod and at least one strip groove arranged axially along the outer surface of the fixing rod, the annular groove being connected to the strip groove, and the annular groove being close to the location of the fixing tail;

[0013] The self-locking component includes a retaining ring that mates with the annular groove and at least one self-locking piece that mates with the strip groove. The distal end of the self-locking piece is connected to the retaining ring. The self-locking piece extends from the retaining ring along the axis of the self-locking component to the proximal end. The proximal end of the self-locking piece is provided with a self-locking portion that protrudes outward away from the axis of the self-locking component.

[0014] Optionally, the fixing rod is provided with a locking block that complements the annular groove in the circumferential direction, and the retaining ring is provided with a locking slot that cooperates with the locking block.

[0015] Optionally, the self-locking part is arc-shaped and bends outward away from the axis of the self-locking member.

[0016] Optionally, the proximal end of the self-locking part is a toothed structure with at least one first fixing tooth, which is used to engage with the bone hole wall of the bone to be replaced by the trochlea or to be embedded in the bone to be replaced by the trochlea.

[0017] Optionally, the fixed tail is tapered, the outer diameter of the fixed tail gradually decreases from the proximal end to the distal end, and the distal end of the fixed tail is provided with a hemisphere.

[0018] To solve the above-mentioned technical problems, the present invention also provides a trolley replacement system, the trolley replacement system including a trolley prosthesis and at least one of the fixation devices described above, the fixation device being installed on the distal end of the trolley prosthesis.

[0019] Optionally, the distal end face of the trochlear prosthesis is provided with a plurality of second fixation teeth for ingrowth into the bone tissue of the bone to be replaced by the trochlear prosthesis.

[0020] Optionally, the proximal end face of the trochlear prosthesis is arc-shaped, and the proximal end face of the trochlear prosthesis protrudes towards the proximal end of the trochlear prosthesis.

[0021] Optionally, baffles are provided on both sides of the proximal end face of the trolley prosthesis, and a trolley groove is formed between the two baffles and the proximal end face of the trolley prosthesis.

[0022] Optionally, the proximal end face of the baffle is arc-shaped and protrudes towards the proximal end of the trochlear prosthesis.

[0023] Compared with the prior art, the fixing device and trolley replacement system provided by the present invention have the following advantages:

[0024] The fixation device provided by this invention includes a fixation member and a self-locking member mounted on the fixation member. The fixation member comprises, from proximal to distal, a fixation head, a fixation rod, and a fixation tail connected sequentially. The proximal end of the fixation head is mounted on the distal end of the trochlear prosthesis, and the distal end of the fixation head is connected to the proximal end of the fixation rod. The distal end of the fixation tail is inserted into the bone to be replaced by the trochlear prosthesis. The distal end of the self-locking member is mounted on the fixation rod, and the proximal end of the self-locking member protrudes radially outward along the fixation rod. Therefore, by mounting the proximal end of the fixation member of the fixation device onto the trochlear prosthesis and inserting the distal end of the fixation member into the bone hole of the bone to be replaced (e.g., the femur), the trochlear prosthesis can be directly fixed to the bone to be replaced (e.g., the femur). Compared to the prior art method of fixing the trochlear prosthesis to the bone to be replaced (e.g., the femur) using a base plate and screws, this invention not only effectively improves the efficiency of surgical procedures and reduces the difficulty of surgical procedures, but also effectively reduces surgical costs. Furthermore, since the proximal end of the self-locking member installed on the fixation member protrudes radially outward along the fixation rod, when the fixation member is inserted into the bone hole of the bone to be replaced (e.g., the femur), the proximal end of the self-locking member can lock onto the wall of the bone hole of the bone to be replaced or embed into the bone to be replaced, thereby further and more firmly fixing the trochlear prosthesis to the bone to be replaced (e.g., the femur), effectively improving the stability during the trochlear prosthesis fixation process.

[0025] The trochlear replacement system provided by this invention includes a trochlear prosthesis and at least one fixation device as described above. Therefore, the trochlear replacement system provided by this invention can directly fix the trochlear prosthesis to the bone to be replaced (e.g., the femur) through the fixation device, thereby effectively improving the efficiency and reducing the difficulty of the surgical procedure, and also effectively reducing surgical costs. Furthermore, since the proximal end of the self-locking member of the fixation device can engage with the wall of the bone hole or embed itself in the bone when the fixation member is inserted into the bone hole of the bone to be replaced (e.g., the femur), the trochlear prosthesis can be further firmly fixed to the bone to be replaced (e.g., the femur), effectively improving the stability of the trochlear replacement system during long-term use. Attached Figure Description

[0026] Figure 1 A schematic diagram of the overall structure of the fixing device provided in one embodiment of the present invention;

[0027] Figure 2 This is a front view of a fastener in a fastening device provided according to an embodiment of the present invention;

[0028] Figure 3 This is a front view of a self-locking component in a fixing device provided according to an embodiment of the present invention;

[0029] Figure 4 A bottom view of a self-locking component in a fixing device provided according to an embodiment of the present invention;

[0030] Figure 5 for Figure 2 The self-locking component shown is a cross-sectional view along plane AA;

[0031] Figure 6 A side view of a self-locking member in a fixing device provided according to an embodiment of the present invention;

[0032] Figure 7 A bottom view (view from the far end to the near end) of a trolley replacement system provided in an embodiment of the present invention;

[0033] Figure 8 for Figure 7 The trolley replacement system shown is a cross-sectional view along plane BB;

[0034] Figure 9 for Figure 7 A cross-sectional view of the trolley replacement system shown along the CC plane;

[0035] Figure 10 This is a schematic diagram of the overall structure of the trochlear prosthesis in a trochlear replacement system provided according to an embodiment of the present invention.

[0036] The accompanying figure is labeled as follows:

[0037] Fixing component - 100; Fixing head - 110; External thread - 111; Fixing rod - 120; Slot - 121; Annular groove - 1211; Strip groove - 1212; Locking block - 1213; Fixing tail - 130; Hemisphere - 131;

[0038] Self-locking component-200; retaining ring-210; bayonet-211; self-locking piece-220; self-locking part-221; first fixing tooth-222;

[0039] Pulley prosthesis - 300; distal end face - 310; second fixed tooth - 311; proximal end face - 320, 331; baffle - 330; pulley groove - 340; front section arc - 350; rear section arc - 360. Detailed Implementation

[0040] The following detailed description of the fixing device and trolley replacement system proposed in this invention, in conjunction with the accompanying drawings and specific embodiments, will further illustrate these features. The advantages and features of this invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, intended only to facilitate and clearly illustrate the embodiments of this invention. Please refer to the drawings to make the objectives, features, and advantages of this invention more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this invention. Any modifications to the structure, changes in proportions, or adjustments to the size, provided that the effects and objectives achieved by this invention are the same or similar, should still fall within the scope of the technical content disclosed in this invention. Specific design features of the invention disclosed herein, including, for example, specific dimensions, orientations, positions, and shapes, will be determined in part by the specific application and usage environment. Furthermore, in the embodiments described below, the same reference numerals are sometimes used across different drawings to denote the same parts or parts having the same function, omitting repeated descriptions. In this specification, similar reference numerals and letters are used to denote similar items; therefore, once an item is defined in one figure, it need not be discussed further in subsequent figures. Furthermore, if the methods described herein involve a series of steps, and the order of these steps presented herein is not necessarily the only possible order in which they can be performed, some of the described steps may be omitted and / or other steps not described herein may be added to the method.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The singular forms “a,” “an,” and “the” include plural objects. The term “or” is generally used to mean “and / or,” the term “several” is generally used to mean “at least one,” and the term “at least two” is generally used to mean “two or more.” Furthermore, the terms “first,” “second,” and “third” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0042] Furthermore, in the description of this specification, the reference to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] The core idea of ​​this invention is to provide a fixation device and a trochlear replacement system to solve the problems of existing trochlear replacement systems that use a base plate and screws for fixation. These systems are complex in structure, which not only affects the efficiency of surgical operations and increases the difficulty of the operation, but also results in inconvenient fixation, poor stability, and high cost. It should be noted that, as those skilled in the art will understand, the term "distal end" in this invention refers to the end away from the operator, and the term "proximal end" refers to the end closer to the operator.

[0047] To achieve the above-mentioned idea, the present invention provides a fixing device for securing the trochlear prosthesis 300 (see...) Figure 10 It is fixed to the bone to be replaced by the trochlea. Please refer to... Figures 1 to 3 ,in Figure 1 A schematic diagram of the overall structure of the fixing device provided in one embodiment of the present invention is shown. Figure 2 A schematic front view of a fastener in a fastening device provided according to an embodiment of the present invention is given; Figure 3 A schematic front view of the self-locking element in a fixing device according to an embodiment of the present invention is shown. Figures 1 to 3As shown, the fixation device includes a fixation member 100 and a self-locking member 200 mounted on the fixation member 100. The fixation member 100 includes a fixation head 110, a fixation rod 120, and a fixation tail 130 connected in sequence from the proximal end to the distal end. The distal end of the fixation tail 130 is used to insert into the bone to be replaced by the trochlea. The proximal end of the fixation head 110 is used to be mounted on the distal end of the trochlea prosthesis 300. The distal end of the fixation head 110 is connected to the proximal end of the fixation rod 120. The distal end of the self-locking member 200 is mounted on the fixation rod 120, and the proximal end of the self-locking member 200 protrudes outward along the radial direction of the fixation rod 120.

[0048] Therefore, by mounting the proximal end of the fixation member 100 of the fixation device provided by the present invention onto the trochlear prosthesis 300 and inserting the distal end of the fixation member 100 into the bone hole of the bone to be replaced by the trochlear prosthesis (e.g., the femur), the trochlear prosthesis 300 can be directly fixed to the bone to be replaced by the trochlear prosthesis (e.g., the femur). Compared with the prior art method of fixing the trochlear prosthesis 300 to the bone to be replaced by the trochlear prosthesis (e.g., the femur) using a base plate and screws, the present invention can not only effectively improve the efficiency of surgical operation and reduce the difficulty of surgical operation, but also effectively reduce surgical costs. Furthermore, since the proximal end of the self-locking member 200 installed on the fixation member 100 protrudes outward along the radial direction of the fixation rod 120, when the fixation member 100 is inserted into the bone hole of the bone to be replaced by the trochlea (e.g., the femur), the proximal end of the self-locking member 200 can be locked onto the wall of the bone hole of the bone to be replaced by the trochlea or embedded in the bone to be replaced by the trochlea, thereby further and more firmly fixing the trochlea prosthesis 300 to the bone to be replaced by the trochlea (e.g., the femur), effectively improving the stability of the trochlea prosthesis 300 during the fixation process.

[0049] It should be noted that, as those skilled in the art will understand, the bone hole is pre-drilled during the surgery, and the inner diameter of the bone hole matches the outer diameter of the fixation rod 120.

[0050] Please continue to refer to this. Figure 1 and Figure 2 ,like Figure 1 and Figure 2As shown, in an exemplary embodiment, the fixing head 110 is provided with an external thread 111, and the fixing head 110 is used to be installed on the distal end of the trochlear prosthesis 300 by means of a threaded connection. Thus, by providing the external thread 111 on the fixing head 110 and providing a threaded hole at the distal end of the trochlear prosthesis 300 that mates with the fixing head 110, the fixing head 110 can be securely installed on the distal end of the trochlear prosthesis 300 by means of a threaded connection. This not only simplifies the overall structure of the fixation device but also makes it easier to fix the fixation device to the trochlear prosthesis 300, and facilitates operation.

[0051] Please continue to refer to this. Figure 2 ,like Figure 2 As shown, in one exemplary embodiment, the fixation tail 130 is tapered, and a hemisphere 131 is provided at the distal end of the fixation tail 130. Thus, by configuring the fixation tail 130 as a tapered structure with an outer diameter that gradually decreases from proximal to distal, it can act as a guide when the fixation member 100 is inserted into the bone hole of the bone to be replaced by the trochlea (e.g., the femur), making it easier to insert the fixation member 100 into the bone hole of the bone to be replaced by the trochlea (e.g., the femur). Furthermore, the hemisphere 131 at the distal end of the fixation tail 130 provides even better guidance.

[0052] Please continue to refer to this. Figure 2 ,like Figure 2 As shown, in an exemplary embodiment, the outer surface of the fixing rod 120 is provided with a slot 121 that mates with the self-locking member 200. Therefore, by providing the slot 121 on the outer surface of the fixing rod 120 to mate with the self-locking member 200, the self-locking member 200 can be fixed to the fixing rod 120 by a snap-fit ​​mechanism, while simultaneously connecting to the external skeleton. This not only simplifies the overall structure of the fixing device but also makes it easier to fix the self-locking member 200 to the fixing rod 120, thus facilitating operation.

[0053] Further, please refer to Figures 2 to 4 ,in Figure 4 A bottom view schematically shown is provided for a self-locking element in a fixing device according to an embodiment of the present invention. For example... Figures 2 to 4As shown, the slot 121 includes an annular groove 1211 circumferentially arranged along the outer surface of the fixing rod 120 and at least one strip groove 1212 axially arranged along the outer surface of the fixing rod 120. The annular groove 1211 communicates with the strip groove 1212, and the annular groove 1211 is located near the fixing tail 130. The self-locking member 200 includes a retaining ring 210 that cooperates with the annular groove 1211 and at least one self-locking piece 220 that cooperates with the strip groove 1212. The distal end of the self-locking piece 220 is connected to the retaining ring 210 and extends proximally from the retaining ring 210 along the axis of the self-locking member 200. The proximally end of the self-locking piece 220 has a self-locking portion 221 protruding outward away from the axis of the self-locking member 200. The self-locking piece 220 is elastic. Therefore, the retaining ring 210 can be fixed in the annular groove 1211, and the self-locking piece 220 can be fixed in the corresponding strip groove 1212. This not only further simplifies the overall structure of the fixing device provided by the present invention, but also makes it easier to fix the self-locking piece 200 on the fixing rod 120.

[0054] Furthermore, the dual engagement of the retaining ring 210 and the annular groove 1211, and the self-locking piece 220 and the strip groove 1212, can further improve the stability of the connection between the self-locking member 200 and the fixing member 100, thereby more effectively and firmly fixing the trochlear prosthesis 300 to the bone (e.g., femur) to be replaced by the trochlear prosthesis.

[0055] Furthermore, since the self-locking plate 220 has a sheet-like structure, it possesses a certain degree of elasticity, making it easier to insert the self-locking member 200 together with the fixation member 100 into the bone hole of the bone to be replaced by the trochlea (e.g., the femur). In addition, since the proximal end of the self-locking plate 220 has a self-locking portion 221, when the self-locking plate 220 is engaged in the corresponding groove 1212, the self-locking portion 221 can extend outside the groove 1212. Therefore, when the fixation member 100 is inserted into the bone hole of the bone to be replaced by the trochlea (e.g., the femur), the self-locking portion 221 can engage with the wall of the bone hole or embed itself into the bone, thereby further and more firmly fixing the trochlea prosthesis 300 to the bone, effectively improving the stability of the trochlea prosthesis 300 during fixation.

[0056] It should be noted that, as those skilled in the art will understand, the self-locking piece 220 is an elastic sheet-like structure, and the structure of the strip groove 1212 matches that of the self-locking piece 220. The number of strip grooves 1212 included in the slot 121 is consistent with the number of self-locking pieces 220 included in the self-locking component 200, that is, there is a one-to-one correspondence between the strip grooves 1212 and the self-locking pieces 220. Furthermore, it should be noted that although this invention is described using the example of the slot 121 including two strip grooves 1212 and the self-locking component 200 including two self-locking pieces 220, as those skilled in the art will understand, in other embodiments, the number of strip grooves 1212 and the number of self-locking pieces 220 can also be one, three, or more. The number of strip grooves 1212 and the number of self-locking pieces 220 can be set according to specific circumstances, and this invention does not limit this.

[0057] In a preferred embodiment, when there are multiple strip grooves 1212 and multiple self-locking pieces 220, the multiple strip grooves 1212 are evenly arranged circumferentially along the fixing rod 120, and the multiple self-locking pieces 220 are also evenly arranged circumferentially along the retaining ring 210. Thus, by providing multiple evenly arranged strip grooves 1212 on the fixing rod 120, and configuring the self-locking member 200 to include multiple evenly arranged self-locking pieces 220, the stability of the connection between the fixation device provided by the present invention and the bone to be replaced by the trochlea (e.g., the femur) can be further improved, further ensuring that the trochlea prosthesis 300 can be firmly fixed to the bone to be replaced by the trochlea (e.g., the femur).

[0058] Please continue to refer to this. Figure 4 and Figure 5 ,in Figure 5 It is given schematically. Figure 2 The self-locking component shown is a cross-sectional view along plane AA. (See attached image.) Figure 4 and Figure 5 As shown, the fixing rod 120 has a complementary locking block 1213 on the circumference of the annular groove 1211, and the retaining ring 210 has a locking slot 211 that cooperates with the locking block 1213. Therefore, by engaging the locking block 1213 into the locking slot 211, the self-locking member 200 can be firmly fixed to the fixing rod 120, thereby further improving the stability of the trochlear prosthesis 300 during installation and ensuring that the trochlear prosthesis 300 is firmly fixed to the bone (e.g., femur) to be replaced by the trochlear prosthesis.

[0059] Please continue to refer to this. Figure 3 ,like Figure 3As shown, the self-locking part 221 is arc-shaped and bends outward away from the axis of the self-locking member 200. Therefore, by setting the self-locking part 221 as an arc-shaped structure bending outward away from the axis of the self-locking member 200, not only can the overall structure of the self-locking member 200 be further simplified and costs reduced, but it also facilitates the insertion of the self-locking member 200 together with the fixing member 100 into the bone hole of the bone to be replaced (e.g., the femur). This allows the self-locking part 221 to smoothly engage with the wall of the bone hole of the bone to be replaced (e.g., the femur) or embed itself into the bone to be replaced (e.g., the femur), thereby firmly fixing the trochlear prosthesis 300 to the bone to be replaced (e.g., the femur).

[0060] Please continue to refer to this. Figure 6 The diagram schematically shows a side view of a self-locking component provided in one embodiment of the present invention. Figure 6 As shown, the proximal end of the self-locking portion 221 is configured with a toothed structure and has at least one first fixing tooth 222. This effectively ensures that when the self-locking member 200, together with the fixing member 100, is inserted into the bone hole of the bone to be replaced (e.g., the femur), the self-locking portion 221 can smoothly engage with the wall of the bone hole or embed itself into the bone to be replaced (e.g., the femur), thus better securing the trochlear prosthesis 300 firmly to the bone to be replaced (e.g., the femur). It should be noted that, as those skilled in the art will understand, when the proximal end of the self-locking portion 221 has at least two or more first fixing teeth 222, bone tissue can also grow into two adjacent first fixing teeth 222, thereby further improving the stability of the connection between the fixation device provided by the present invention and the bone (e.g., the femur), thus enabling the trochlear prosthesis 300 to be firmly fixed to the bone to be replaced (e.g., the femur) for a long period of time. Furthermore, it should be noted that, as those skilled in the art will understand, in some other embodiments, the proximal end of the self-locking part 221 may also be a flat-headed, round-headed, or other shaped structure.

[0061] To achieve the above-mentioned ideas, the present invention also provides a trolley replacement system, please refer to... Figures 7 to 9 ,in Figure 7 A bottom view (view from the far end to the near end) of a trolley replacement system provided in one embodiment of the present invention is shown schematically. Figure 8 It is given schematically. Figure 7 The trolley replacement system shown is a cross-sectional view along plane BB; Figure 9 It is given schematically. Figure 7 The diagram shows a cross-sectional view of the trolley replacement system along the C-plane. (See diagram for reference.) Figures 7 to 9As shown, the trochlear replacement system includes a trochlear prosthesis 300 and at least one fixation device as described above, which is mounted on the distal end of the trochlear prosthesis 300. Because the trochlear replacement system provided by this invention includes the fixation device described above, the trochlear prosthesis 300 can be directly fixed to the bone to be replaced (e.g., the femur) via the fixation device, thereby effectively improving the efficiency and reducing the difficulty of the surgical procedure, and also effectively reducing surgical costs. Furthermore, when the fixation member 100 of the fixation device is inserted into the bone hole of the bone to be replaced (e.g., the femur), the proximal end of the self-locking member 200 of the fixation device can engage with the wall of the bone hole or embed itself in the bone to be replaced, thereby further securing the trochlear prosthesis 300 to the bone to be replaced (e.g., the femur), effectively improving the stability of the trochlear replacement system during long-term use.

[0062] It should be noted that although this invention is described using the example of a trolley replacement system comprising three of the aforementioned fixation devices, as those skilled in the art will understand, this does not constitute a limitation of the invention. In other embodiments, the trolley replacement system may include only one of the aforementioned fixation devices, or it may include two, four, or more of the aforementioned fixation devices. The number of fixation devices included in the trolley replacement system can be set according to specific circumstances. Specifically, the number of fixation devices is related to the size of the trolley prosthesis 300 (i.e., the size of the distal end face 310 of the trolley prosthesis 300). The larger the size of the trolley prosthesis 300 (i.e., the larger the area of ​​the distal end face 310 of the trolley prosthesis 300), the more fixation devices the trolley replacement system includes; conversely, the smaller the size of the trolley prosthesis 300 (i.e., the smaller the area of ​​the distal end face 310 of the trolley prosthesis 300), the fewer fixation devices the trolley replacement system includes.

[0063] Please continue to refer to this. Figure 7 and Figure 8The distal end face 310 of the trochlear prosthesis 300 is provided with a plurality of second fixing teeth 311 for ingrowth into the bone tissue of the bone to be replaced by the trochlear prosthesis. Thus, by providing a plurality of second fixing teeth 311 on the distal end face 310 of the trochlear prosthesis 300, the gap between each adjacent pair of second fixing teeth 311 allows bone tissue to ingrow in, thereby enabling the trochlear prosthesis 300 to be firmly fixed to the bone to be replaced (e.g., the femur) for a long period of time, thus ensuring the stability of the trochlear replacement system provided by this invention during long-term use. It should be noted that, as those skilled in the art will understand, the shape of the second fixing teeth 311 can be a quadrangular pyramidal structure, a wavy arc-shaped structure, or other shapes. This invention does not limit these shapes, as long as the gap between adjacent pairs of second fixing teeth 311 allows bone tissue to ingrow in. It should also be noted that, as those skilled in the art will understand, the second fixing teeth 311 can be selectively provided in a portion of the distal end face 310 of the trochlear prosthesis 300, rather than being provided on the distal end face 310 of the trochlear prosthesis 300. The specific arrangement can be made according to the actual situation, and the present invention does not limit this.

[0064] Please continue to refer to this. Figures 8 to 10 ,in Figure 10 A schematic diagram illustrating the overall structure of the trochlear prosthesis in a trochlear replacement system provided by an embodiment of the present invention is given. Figures 8 to 10 As shown, the proximal end face 320 of the trochlear prosthesis 300 is arc-shaped, and the proximal end face 320 protrudes towards the proximal end of the trochlear prosthesis 300. Therefore, by setting the proximal end face 320 of the trochlear prosthesis 300 as an arc-shaped structure protruding towards the proximal end of the trochlear prosthesis 300, the proximal end face 320 can better function as an articular surface to cooperate with bones such as the patella, allowing for smoother movement of these bones, effectively preventing impingement, and reducing the occurrence of conditions such as patellar tendinitis. Furthermore, this design can effectively balance the patellar fit during knee flexion, reducing patellar restriction during knee extension.

[0065] Furthermore, such as Figure 10 As shown, baffles 330 are provided on both sides of the proximal end face 320 of the trochlear prosthesis 300, and a trochlear groove 340 is formed between the two baffles 330 and the proximal end face 320 of the trochlear prosthesis 300. This restricts the range of motion of bones such as the patella within the trochlear groove 340, greatly reducing the risk of postoperative lateral dislocation of the patella and other bones.

[0066] Furthermore, such as Figure 8 and Figure 10 As shown, the proximal end face of the baffle 330 is arc-shaped, and the proximal end face 331 of the baffle 330 protrudes towards the proximal end of the trochlear prosthesis 300. Therefore, by setting the proximal end face 331 of the baffle 330 as an arc-shaped structure protruding towards the proximal end of the trochlear prosthesis 300, impact to bones such as the patella can be further avoided, reducing the occurrence of diseases such as patellar tendinitis.

[0067] Please continue to refer to this. Figure 7 ,like Figure 7 As shown, the front cross-sectional arc 350 of the trochlear prosthesis 300 is smaller than the rear cross-sectional arc 360 of the trochlear prosthesis 300. Therefore, by adopting a design with a smaller front cross-sectional arc 350 and a larger rear cross-sectional arc 360, the movement mechanism of the patient's knee joint can be better matched. When the knee joint is flexed, the quadriceps femoris muscle and patellar ligament are tightened, and the patella and the trochlear groove 340 of the trochlear prosthesis 300 fit tightly together, preventing dislocation. When the knee joint is extended, it ensures that the patella has a certain amount of movement within the trochlear groove 340, without causing patellar dislocation.

[0068] In summary, compared with the prior art, the fixing device and trolley replacement system provided by the present invention have the following advantages:

[0069] The fixation device provided by this invention includes a fixation member and a self-locking member mounted on the fixation member. The fixation member comprises, from proximal to distal, a fixation head, a fixation rod, and a fixation tail connected sequentially. The proximal end of the fixation head is mounted on the distal end of the trochlear prosthesis, and the distal end of the fixation head is connected to the proximal end of the fixation rod. The distal end of the fixation tail is inserted into the bone to be replaced by the trochlear prosthesis. The distal end of the self-locking member is mounted on the fixation rod, and the proximal end of the self-locking member protrudes radially outward along the fixation rod. Therefore, by mounting the proximal end of the fixation member of the fixation device onto the trochlear prosthesis and inserting the distal end of the fixation member into the bone hole of the bone to be replaced (e.g., the femur), the trochlear prosthesis can be directly fixed to the bone to be replaced (e.g., the femur). Compared to the prior art method of fixing the trochlear prosthesis to the bone to be replaced (e.g., the femur) using a base plate and screws, this invention not only effectively improves the efficiency of surgical procedures and reduces the difficulty of surgical procedures, but also effectively reduces surgical costs. Furthermore, since the proximal end of the self-locking member installed on the fixation member protrudes radially outward along the fixation rod, when the fixation member is inserted into the bone hole of the bone to be replaced (e.g., the femur), the proximal end of the self-locking member can lock onto the wall of the bone hole of the bone to be replaced or embed into the bone to be replaced, thereby further and more firmly fixing the trochlear prosthesis to the bone to be replaced (e.g., the femur), effectively improving the stability during the trochlear prosthesis fixation process.

[0070] The trochlear replacement system provided by this invention includes a trochlear prosthesis and at least one fixation device as described above. Therefore, the trochlear replacement system provided by this invention can directly fix the trochlear prosthesis to the bone to be replaced (e.g., the femur) through the fixation device, thereby effectively improving the efficiency and reducing the difficulty of the surgical procedure, and also effectively reducing surgical costs. Furthermore, since the proximal end of the self-locking member of the fixation device can engage with the wall of the bone hole or embed itself in the bone when the fixation member is inserted into the bone hole of the bone to be replaced (e.g., the femur), the trochlear prosthesis can be further firmly fixed to the bone to be replaced (e.g., the femur), effectively improving the stability of the trochlear replacement system during long-term use.

[0071] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure are within the protection scope of the present invention. Obviously, those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the present invention and its equivalents, the present invention also intends to include these modifications and variations.

Claims

1. A fixation device for securing a gliding prosthesis to a bone to be glidingly replaced, characterized in that The fixing device includes a fixing component and a self-locking component installed on the fixing component; The fixation device comprises a fixation head, a fixation rod, and a fixation tail connected in sequence from proximal to distal. The proximal end of the fixation head is used to be installed on the distal end of the trochlear prosthesis. The distal end of the fixation head is connected to the proximal end of the fixation rod. The distal end of the fixation tail is used to be inserted into the bone to be replaced by the trochlear prosthesis. The distal end of the self-locking component is mounted on the fixing rod, and the proximal end of the self-locking component protrudes outward along the radial direction of the fixing rod. The outer surface of the fixing rod is provided with a groove that mates with the self-locking component. The groove includes an annular groove arranged circumferentially along the outer surface of the fixing rod and at least one strip groove arranged axially along the outer surface of the fixing rod. The annular groove and the strip groove are connected, and the annular groove is close to the location of the fixing tail. The self-locking component includes a retaining ring that mates with the annular groove and at least one self-locking piece that mates with the strip groove. The distal end of the self-locking piece is connected to the retaining ring. The self-locking piece extends from the retaining ring along the axis of the self-locking component to the proximal end. The proximal end of the self-locking piece is provided with a self-locking portion that protrudes outward away from the axis of the self-locking component.

2. The fixture of claim 1, wherein The fixing head is provided with external threads, and the fixing head is used to be installed on the distal end of the trochlear prosthesis by means of threaded connection.

3. The fixture of claim 1, wherein The fixing rod is provided with a locking block that complements the annular groove in the circumferential direction, and the locking ring is provided with a locking slot that cooperates with the locking block.

4. The fixture of claim 1, wherein The self-locking part is arc-shaped and bends outward away from the axis of the self-locking component.

5. The fixture of claim 1, wherein The proximal end of the self-locking part is a toothed structure with at least one first fixing tooth, which is used to lock onto the bone hole wall of the bone to be replaced by the trochlea or to embed into the bone to be replaced by the trochlea.

6. The fixing device according to claim 1, characterized in that, The fixed tail is tapered, and its outer diameter gradually decreases from the proximal end to the distal end, with a hemisphere at the distal end.

7. A trolley replacement system, characterized in that, It includes a trochlear prosthesis and at least one fixation device as described in any one of claims 1 to 6, the fixation device being mounted on the distal end of the trochlear prosthesis.

8. The trolley replacement system according to claim 7, characterized in that, The distal end face of the trochlear prosthesis is provided with multiple second fixation teeth for ingrowth into the bone tissue of the bone to be replaced by the trochlear prosthesis.

9. The trolley replacement system according to claim 7, characterized in that, The proximal end face of the trochlear prosthesis is arc-shaped and protrudes towards the proximal end of the trochlear prosthesis.

10. The trolley replacement system according to claim 7, characterized in that, Both sides of the proximal end face of the trolley prosthesis are provided with baffles, and the two baffles form a trolley groove between the proximal end face of the trolley prosthesis.

11. The trolley replacement system according to claim 10, characterized in that, The proximal end face of the baffle is arc-shaped and protrudes towards the proximal end of the trolley prosthesis.

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