Femoral stem prosthesis for fixation of femoral greater trochanter osteotomy block

Abstract

The application provides a femoral stem prosthesis for fixing a femoral greater trochanter bone block, relates to the technical field of femoral stem prostheses, and comprises a stem body which is positioned between a femur and a bone block through a group of upper fastening steel wires and multiple groups of lower fastening steel wires, the stem body comprising an upper stem part, a lower stem part and a neck part, the vertical outer contour side of the upper stem part being sequentially connected in a head-to-tail manner and comprising a top inclined contact surface, a reserved surface, an inclined expansion surface, a bottom inclined contact surface and a first adduction arc surface, the top inclined contact surface being connected with the neck part, and the bottom inclined contact surface being connected with the lower stem part; a thickening unit; the thickening unit is used for increasing a hip abduction muscle force arm and serving as a screw mounting base; and an extension part. The steel wire cerclage of the application provides uniform pressure and wrapping fixation of the tension band principle, the locking screw provides direct rigid anchoring and shear / torsion resistance; the strong proximal pulling force generated by the abduction muscle contraction can be effectively resisted, and the risk of proximal displacement of the bone block can be significantly reduced.

Description

Technical Field

[0001] This invention relates to the field of femoral stem prosthesis technology, and more specifically to a femoral stem prosthesis for fixing osteotomy blocks of the greater trochanter of the femur. Background Technology

[0002] Femoral revision refers to the revision surgery performed after total hip arthroplasty when complications such as loosening, wear, breakage, periprosthetic fracture, infection, or osteolysis of the femoral prosthesis (such as the femoral stem) occur. The purpose is to restore hip joint function, relieve pain, and correct deformity.

[0003] like Figure 16 The diagram illustrates a femoral lateral revision surgery. It begins with a long, oblique osteotomy of the proximal femur, directed from the superior medial to the inferior lateral aspect. The purpose of this osteotomy is to improve surgical exposure in revision surgery of stiff hip joints, remove the well-fixed femoral prosthesis, the intramedullary cement sheath, and correct proximal femoral bone deformities. After the femoral prosthesis is inserted into the distal femoral medullary cavity, the greater trochanteric osteotomy is repositioned and internally fixed to maintain stability at the osteotomy site. Clinically, the fixation methods for the greater trochanteric osteotomy fragments mainly include wire cerclage and greater trochanteric plate and screw fixation. However, greater trochanteric plate and screw fixation often disrupts the blood supply to more of the osteotomy fragment, affecting bone healing. Therefore, clinicians tend to prefer wire cerclage fixation. Wire cerclage fixation has the advantages of minimal disruption to the blood supply to the osteotomy fragment, is not affected by the surgical approach, and is convenient for fixation via both anterior and posterior hip joint revision approaches.

[0004] like Figure 17 The image shows a traditional revision femoral stem prosthesis and wire cerclage fixation used in hip lateral revision surgery. To meet the need for rapid early hip joint function recovery after revision surgery, patients are often encouraged to bear weight and walk before the osteotomy fragment has healed. During normal walking, the traditional femoral stem prosthesis combined with wire cerclage fixation is insufficient to counteract the proximal traction of the hip abductor muscles, especially in patients with vastus lateralis damage and osteoporosis or bone defects of the greater trochanter of the femur. This leads to a high risk of proximal displacement of the greater trochanter osteotomy fragment and a high incidence of nonunion, subsequently resulting in complications such as insufficient hip abductor muscle strength, hip pain, hip impingement, hip dislocation, and limping gait. Therefore, improving the biomechanical stability of the osteotomy fragment fixation without affecting its blood supply is a critical clinical challenge that needs to be addressed in hip revision surgery. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a femoral stem prosthesis for fixing osteotomy blocks of the greater trochanter of the femur, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A femoral stem prosthesis for fixing the greater trochanter osteotomy block of the femur includes a stem body, which is positioned with the femur and the osteotomy block by a set of upper fastening wires and multiple sets of lower fastening wires. The stem body includes an upper stem part, a lower stem part and a neck. The vertical outer contour side of the upper stem part is a top oblique contact surface, a reserved surface, an oblique expansion surface, a bottom oblique contact surface and a first inward arc surface connected end to end. The neck is connected at the top oblique contact surface and the lower stem part is connected at the bottom oblique contact surface.

[0008] One side of the lower handle is a second inward-curving surface and the other side is a third inward-curving surface. The inward direction of the second and third inward-curving surfaces is opposite. The second inward-curving surface continues to the bottom of the first inward-curving surface, and the third inward-curving surface is connected to the bottom of the sloping expansion surface. The sloping expansion surface is a planar structure, and the angle between the reserved surface and the sloping expansion surface is greater than the angle between the reserved surface and the third inward-curving surface.

[0009] The thickening unit fills the triangular area formed by the extended line of the reserved surface, the upward extended line of the third inward-curving surface, and the oblique expansion surface. The thickening unit has a first perforation and a second perforation. A guide is embedded in both the first and second perforations. A first locking screw passes through the first perforation, and a second locking screw passes through the second perforation. The first and second locking screws pass through the thickening unit and are drilled into the osteotomy block to reduce proximal displacement of the osteotomy block. The thickening unit is used to increase the lever arm of the hip abductor muscle and serve as a base for screw installation.

[0010] The extension is located at the bottom end of the lower handle. A cross-shaped deformation groove is provided at the bottom of the extension, and the coronal depth of the deformation groove is greater than the sagittal depth.

[0011] Furthermore, the first locking screw is screwed in at an angle of 35°, and the second locking screw is screwed in at an angle of 45°.

[0012] Furthermore, the thickening unit includes a thickening body that fills the triangular area and is located at the obliquely expanded surface of the upper handle and is integrated with the upper handle; a first implantation hole is provided at the reserved surface.

[0013] Furthermore, a receiving cavity is provided at one corner of the top of the upper handle. The top opening of the receiving cavity is located at the reserved surface, and the side opening of the receiving cavity is located at the inclined expansion surface. The inner wall of the top opening is symmetrically provided with upper blocks near the neck end. The upper blocks are between the upper blocks, and the area of ​​the top opening other than the operating gap is the insertion gap. The inner diameter of the insertion gap is larger than the inner diameter of the operating gap. The inner wall of the side opening is symmetrically provided with side blocks.

[0014] Furthermore, the thickening unit includes an adjusting component, a locking component, and an abutment. The adjusting component is embedded in the receiving cavity, and the main body of the adjusting component is stopped below the upper stop block. The side of the adjusting component is connected to the locking component, which slides horizontally within the receiving cavity. The abutment is vertically inserted into the receiving cavity through the operating gap and slides horizontally within the receiving cavity. The side baffle stops the abutment from the outside. The locking component is used to vertically lock the abutment from the inside and push the abutment to move horizontally, so that the abutment fully conforms to the osteotomy block and tightens the fastening wire on the osteotomy block.

[0015] Furthermore, the adjusting component includes a vertical box body, a bidirectional screw, and an adjusting block. The vertical box body has a U-shaped top view. An implant block and an operating block are installed at the top of the interior of the vertical box body. The implant block is located above the operating block. A second implant hole is opened inside the implant block. An operating hole is opened inside the operating block. The inner diameter of the second implant hole is larger than the inner diameter of the operating hole. A stop is installed at the bottom of the upper stop block. The implant block extends out of the vertical box body and into the operating gap.

[0016] The bottom of the vertical box is fitted with a base block. The bottom end of the bidirectional screw is rotatably installed in the base block, and the top end is rotatably inserted into the operating hole. Two sets of adjusting blocks are symmetrically threaded on the outer wall of the bidirectional screw. The two sets of adjusting blocks slide vertically on the inner wall of the vertical box. Each set of adjusting blocks has symmetrical abutment posts on both sides. The adjusting blocks have a self-locking component for locking the bidirectional screw.

[0017] Furthermore, the self-locking component includes a rotating plate, with a rotating plate at the top of the bidirectional screw. The rotating plate has a hexagonal groove inside and a toothed groove on its outer wall. A floating ring is vertically slidably fitted onto the outer wall of the rotating plate and is vertically slidably placed in the operating hole. The inner wall of the floating ring has a toothed ring that is vertically inserted into the toothed groove. Floating blocks are symmetrically arranged on the side walls of the floating ring. Movable grooves are extended outward on both sides of the operating hole. The floating blocks are vertically slidably placed in the movable grooves. A spring rod is provided at the bottom end of the floating blocks.

[0018] Furthermore, the locking component includes a vertical plate, which is horizontally inserted into the side opening of the vertical box. The top of the vertical plate extends into the operating gap. A guide block and a mating plate are symmetrically provided on one side of the vertical plate. The guide block is slidably inserted into a groove on the inner wall of the vertical box. A spring is embedded in the groove, which is used to drive the guide block to retract. The mating plate has a right-angled trapezoidal side cross section. The abutment post is located on the outside of the mating plate. The inclined surface of the mating plate is in contact with the abutment post. The outer wall of the vertical plate is provided with locking teeth. The cross section of the locking teeth is a right-angled triangle, and the inclined surface of the locking teeth faces upward.

[0019] Furthermore, the abutment includes a back plate, a middle block, and a support block. The back of the back plate is provided with mating teeth. The side cross-section of the mating teeth is a right triangle with the inclined surface facing down. The locking teeth are inserted between adjacent mating teeth. The outer side of the back plate is provided with the middle block. The outer side of the middle block is provided with the support block. The support block has a first through hole and a second through hole. The widths of the support block, the back plate, and the middle block decrease sequentially. The width of the support block is the same as the thickness of the upper handle. The back plate enters the receiving cavity through the insertion gap. The side baffles slide and clamp the two sides of the middle block. The back of the support block is provided with an inclined surface adapted to the inclined expansion surface.

[0020] Furthermore, the top of the vertical plate is symmetrically provided with a through-ring, which is used to allow the two reinforcing extensions of the fastening wire on the osteotomy block to pass through in an X-shape. After passing through the through-ring, the two reinforcing extensions are twisted together and put into the implantation hole.

[0021] This invention provides a femoral stem prosthesis for fixing osteotomy blocks of the greater trochanter of the femur. Compared with the prior art, it has the following advantages:

[0022] 1. The design of the first locking screw and the second locking screw has the following effects:

[0023] 1.1 Dual fixation mechanism: Wire circumference provides uniform pressure and wrapping fixation based on the tension band principle, while locking screws provide direct rigid anchoring and resistance to shear / torsion. Wire circumference causes less interference to the soft tissues (including blood supply) surrounding the bone fragment than traditional trochanter plates.

[0024] 1.2 The two locking screws of the femoral prosthesis are obliquely distributed outward and downward (at 35° and 45° to the axis of the femoral prosthesis, respectively), forming a stable fixation frame. Its axial force can effectively resist the strong proximal traction force generated by the contraction of the abductor muscle, which can significantly reduce the risk of proximal displacement of the osteotomy block, especially suitable for osteoporotic bone.

[0025] 2. The thickening unit design has the following effects: The thickening unit can widen the proximal end of the prosthesis, for example, by 30%. This thickening unit can compensate for the triangular area of ​​the traditional prosthesis, providing a more solid base for the fixation of the two sets of locking screws, and also helps to increase the lever arm of the hip abductor muscle. It is particularly suitable for femoral greater trochanter bone defects, providing walking support for the osteotomy block and preventing loosening.

[0026] 3. The cross-shaped deformation groove at the bottom of the extension (with greater depth in the coronal plane) can deform with the shape of the femoral channel to adapt to the narrow lower channel. After deformation, it resists the inner wall of the femur, improving implantation stability. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0028] Figure 1 A schematic diagram of the overall structure of Embodiment 1 is shown;

[0029] Figure 2 A schematic diagram of the first locking screw insertion cross-section structure of Embodiment 1 is shown;

[0030] Figure 3 A schematic diagram of the first locking screw structure of Embodiment 1 is shown;

[0031] Figure 4 A schematic diagram of the second locking screw insertion cross-section structure of Embodiment 1 is shown;

[0032] Figure 5 A schematic diagram of the upper fastening steel wire winding state structure of Embodiment 1 is shown;

[0033] Figure 6 A schematic diagram of the structure at the upper handle portion of Embodiment 2 is shown;

[0034] Figure 7 It shows Figure 6 A magnified structural diagram at point B;

[0035] Figure 8 A schematic diagram of the receiving cavity structure of Embodiment 2 is shown;

[0036] Figure 9 A schematic diagram of the adjustment component structure in Embodiment 2 is shown;

[0037] Figure 10 A top view cross-sectional diagram of the operating block in Embodiment 2 is shown;

[0038] Figure 11 A schematic diagram of the cross-sectional structure of the implantation block and the operating block in Embodiment 2 is shown;

[0039] Figure 12 It shows Figure 11 A schematic diagram of the structure at point A;

[0040] Figure 13 A schematic diagram of the locking component structure of Embodiment 2 is shown;

[0041] Figure 14 A schematic diagram of the abutment structure of Embodiment 2 is shown;

[0042] Figure 15 A schematic diagram of the upper fastening steel wire winding state structure of Embodiment 2 is shown;

[0043] Figure 16 A schematic diagram of the osteotomy block positioning state structure in the background art is shown;

[0044] Figure 17 A schematic diagram of a traditional femoral stem prosthesis structure in the background art is shown;

[0045] As shown in the figure:

[0046] 100. Handle,

[0047] 110. Upper handle; 111. Top inclined contact surface; 112. Reserved surface; 113. Inclined expansion surface; 114. Bottom inclined contact surface; 115. First inward-curving surface; 116. First implantation hole; 120. Lower handle; 121. Second inward-curving surface; 122. Third inward-curving surface; 130. Neck; 140. Receiving cavity; 141. Top opening; 142. Upper stop; 143. Operating gap; 144. Insertion gap; 145. Side opening; 146. Side stop; 150. Extension; 151. Deformation groove.

[0048] 200. Thickened body

[0049] 310. First through hole; 311. First locking screw; 320. Second through hole; 321. Second locking screw; 330. Guide.

[0050] 400. Adjusting component; 410. Vertical box body; 411. Slide groove; 412. Spring; 420. Implant block; 421. Second implant hole; 430. Operating block; 431. Operating hole; 432. Movable groove; 440. Bidirectional screw; 441. Rotating plate; 442. Hexagonal slot; 443. Gear groove; 445. Base block; 450. Self-locking component; 451. Floating ring; 452. Gear ring; 453. Floating block; 454. Spring rod; 460. Adjusting block; 461. Abutment post.

[0051] 500. Locking component; 510. Vertical plate; 520. Guide block; 530. Mating plate; 540. Locking tooth; 550. Through ring.

[0052] 600, contact body; 610, back plate; 620, mating teeth; 630, middle block; 640, support block.

[0053] 700. Upper fastening wire; 710. Reinforcing extension; 720. Lower fastening wire; 730. First twisted section; 740. Second twisted section.

[0054] 800, femur; 810, osteotomy piece. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, 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.

[0056] Example 1: To solve the problems in the background art, combined with Figures 1-5 As shown, the femoral stem prosthesis for fixing the greater trochanter osteotomy block of the femur provided by the present invention includes:

[0057] The handle 100 includes an upper handle 110, a lower handle 120, and a neck 130. The vertical outer contour side of the upper handle 110 consists of a top inclined contact surface 111, a reserved surface 112, an inclined expansion surface 113, a bottom inclined contact surface 114, and a first inwardly curved surface 115 connected end to end. The neck 130 is connected at the top inclined contact surface 111, and the lower handle 120 is connected at the bottom inclined contact surface 114.

[0058] One side of the lower handle 120 is a second inward-curving surface 121, and the other side is a third inward-curving surface 122. The inward direction of the second inward-curving surface 121 and the third inward-curving surface 122 is opposite. The second inward-curving surface 121 continues to the bottom of the first inward-curving surface 115, and the third inward-curving surface 122 is connected to the bottom of the inclined expansion surface 113. The inclined expansion surface 113 is a planar structure. The angle between the reserved surface 112 and the inclined expansion surface 113 is greater than the angle between the reserved surface 112 and the third inward-curving surface 122.

[0059] The thickening unit fills the triangular area formed by the extension line of the reserved surface 112, the upward extension line of the third inward curved surface 122, and the oblique expansion surface 113. The thickening unit is used to provide walking support force. The thickening unit has a first through hole 310 and a second through hole 320. A guide 330 is embedded in the first through hole 310 and the second through hole 320. A first locking screw 311 passes through the first through hole 310 and a second locking screw 321 passes through the second through hole 321. The first locking screw 311 and the second locking screw 321 pass through the thickening unit and are drilled into the osteotomy block 810.

[0060] Locking screws are made of, for example Figure 3 The screw shown has external threads at both the bottom and top, and internal threads in the hole on the prosthesis. Combined with the use of a guide, the locking screw can be self-locking after being screwed in, preventing it from coming off.

[0061] An extension portion 150 is provided at the bottom end of the lower handle portion 120. A cross-shaped deformation groove 151 is provided at the bottom of the extension portion 150. The coronal depth of the deformation groove 151 is greater than the sagittal depth.

[0062] In this embodiment, the first locking screw 311 has an insertion angle of 35° and an offset angle of 0°, and the second locking screw 321 has an insertion angle of 45° and an offset angle of 0°. All of the above angles are angles relative to the vertical axis of the handle 100.

[0063] In the above scheme, the angle design of the first locking screw 311 (coronal position 35°) and the second locking screw 321 (coronal position 45°) is adapted to the bone structure of the greater trochanter osteotomy block 810. This ensures that the screws penetrate deep into the bone to form effective fixation, while avoiding penetration of the bone cortex. It also enhances the connection stability between the osteotomy block 810 and the prosthesis from different angles, reducing the risk of loosening.

[0064] In this embodiment, the thickening unit includes a thickening body 200, which fills the triangular area. The thickening body 200 is located at the obliquely expanded surface 113 of the upper handle 110 and is integrated with the upper handle 110. A first implantation hole 116 is provided at the reserved surface 112.

[0065] This embodiment has the following technical effects:

[0066] 1. The design of the first locking screw 311 and the second locking screw 321 has the following effects:

[0067] 1.1 Dual fixation mechanism: Wire circumference provides uniform pressure and wrapping fixation based on the tension band principle, while locking screws provide direct rigid anchoring and resistance to shear / torsion. Wire circumference causes less interference to the soft tissues (including blood supply) surrounding the bone fragment than traditional trochanter plates.

[0068] 1.2 The two locking screws of the femoral 800 prosthesis are obliquely dispersed outward and downward (at 35° and 45° to the axis of the femoral 800 prosthesis in the coronal plane, respectively), forming a stable fixation frame. Its axial force can effectively resist the strong proximal traction force generated by the contraction of the abductor muscle, which can significantly reduce the risk of proximal displacement of the osteotomy block 810, especially suitable for osteoporotic bone.

[0069] 2. The design of the thickening unit has the following effects: The thickening unit can widen the proximal end of the prosthesis, for example, by 30%. In this way, the thickening unit can compensate for the triangular area of ​​the traditional prosthesis, not only providing a more solid base for the fixation of the two sets of locking screws, but also helping to increase the lever arm of the hip abductor muscle. It is particularly suitable for femoral greater trochanter bone defects, providing walking support for the osteotomy block 810 and preventing loosening.

[0070] 3. The cross-shaped deformation groove 151 (with greater coronal depth) at the bottom of the extension 150 can deform with the shape of the femoral 800 channel to adapt to the narrow lower channel. After deformation, it abuts against the inner wall of the femoral 800 to improve implantation stability. For example, the length of the extension 150 is 5cm-7cm, and the sum of the lengths of the upper stem 110 and the lower stem 120 is 12cm-15cm.

[0071] Example 2: The thickened body 200 in Example 1 is thickened by 30%, but the internal dimensions of the osteotomy block 810 vary among different individuals. Although it can be repaired with bone cement, the operation is inconvenient and the stability is not strong. In order to enhance the applicability of the thickened unit, the following solution is proposed:

[0072] Combination Figures 6-14 As shown, the femoral stem prosthesis for fixing the greater trochanter osteotomy block 810 of the femur 800 provided by the present invention includes:

[0073] The handle 100 includes an upper handle 110, a lower handle 120, and a neck 130. The vertical outer contour side of the upper handle 110 consists of a top inclined contact surface 111, a reserved surface 112, an inclined expansion surface 113, a bottom inclined contact surface 114, and a first inwardly curved surface 115 connected end to end. The neck 130 is connected at the top inclined contact surface 111, and the lower handle 120 is connected at the bottom inclined contact surface 114.

[0074] One side of the lower handle 120 is a second inward-curving surface 121, and the other side is a third inward-curving surface 122. The inward direction of the second inward-curving surface 121 and the third inward-curving surface 122 is opposite. The second inward-curving surface 121 continues to the bottom of the first inward-curving surface 115, and the third inward-curving surface 122 is connected to the bottom of the inclined expansion surface 113. The inclined expansion surface 113 is a planar structure. The angle between the reserved surface 112 and the inclined expansion surface 113 is greater than the angle between the reserved surface 112 and the third inward-curving surface 122.

[0075] The thickening unit fills the triangular area formed by the extension line of the reserved surface 112, the upward extension line of the third inward curved surface 122, and the oblique expansion surface 113. The thickening unit is used to provide walking support force. The thickening unit has a first through hole 310 and a second through hole 320. A guide 330 is embedded in the first through hole 310 and the second through hole 320. A first locking screw 311 passes through the first through hole 310 and a second locking screw 321 passes through the second through hole 321. The first locking screw 311 and the second locking screw 321 pass through the thickening unit and are drilled into the osteotomy block 810.

[0076] An extension portion 150 is provided at the bottom end of the lower handle portion 120. A cross-shaped deformation groove 151 is provided at the bottom of the extension portion 150. The coronal depth of the deformation groove 151 is greater than the sagittal depth.

[0077] In this embodiment, the first locking screw 311 has an insertion angle of 35° and an offset angle of 0°, and the second locking screw 321 has an insertion angle of 45° and an offset angle of 0°. All of the above angles are angles relative to the vertical axis of the handle 100.

[0078] To achieve constrained positioning of the thickening unit and enable its sliding adjustment, in this embodiment, a receiving cavity 140 is provided at one corner of the top of the upper handle 110. The top opening 141 of the receiving cavity 140 is located at the reserved surface 112, and the side opening 145 of the receiving cavity 140 is located at the inclined expansion surface 113. The inner wall of the top opening 141 is symmetrically provided with upper stops 142 near the neck 130. The upper stops 142 are between the upper stops 142, forming an operating gap 143. The area of ​​the top opening 141 other than the operating gap 143 is an insertion gap 144, and the inner diameter of the insertion gap 144 is larger than the inner diameter of the operating gap 143. The inner wall of the side opening 145 is symmetrically provided with side stops 146.

[0079] In the above scheme:

[0080] 1. The top opening 141 of the receiving cavity 140 is provided with an upper stop 142 (forming an operating gap 143 and an insertion gap 144) to limit the vertical displacement of the adjusting component 400; the side opening 145 is provided with a side stop 146 to constrain the lateral movement of the contact body 600 and ensure accurate installation and positioning of the component.

[0081] 2. The insertion gap of 144 (large inner diameter) facilitates the quick insertion of components, while the operating gap of 143 (small inner diameter) provides operating space for surgical tools, balancing ease of installation and positioning stability.

[0082] There is a gap between the osteotomy piece 810 and the prosthesis (the fit is not tight), and the wires are prone to loosening after surgery, which can cause the osteotomy piece 810 to shift and affect the healing effect. To solve the above problems, in this embodiment, the thickening unit includes an adjusting component 400, a locking component 500, and an abutment 600. The adjusting component 400 is embedded in the receiving cavity 140. The main body of the adjusting component 400 is stopped below the upper stop block 142. The side of the adjusting component 400 is connected to the locking component 500. The locking component 500 is horizontally slidably placed in the receiving cavity 140. The abutment 600 is vertically inserted into the receiving cavity 140 through the operating gap 143. The abutment 600 slides horizontally within the receiving cavity with a small amplitude. The side baffle stops the abutment 600 from the outside. The locking component 500 is used to vertically lock the abutment 600 from the inside and push the abutment 600 to move horizontally, so that the abutment 600 fully fits the osteotomy block 810 and tightens the fastening wire 700 on the osteotomy block 810.

[0083] In the above scheme:

[0084] 1. Adjusting component 400 drives locking component 500 to move horizontally, pushing the contact body 600 to slide slightly within the receiving cavity 140, so that the contact body 600 fully fits the inner wall of the osteotomy block 810 and eliminates gaps; during the contact process, the displacement of the osteotomy block 810 can simultaneously tighten the fastening steel wire 700 on the osteotomy block 810, enhance the circumferential constraint of the osteotomy block 810, and prevent the osteotomy block 810 from shifting.

[0085] 2. The locking component 500 can also vertically lock the position of the contact body 600 to prevent the contact body 600 from slipping vertically.

[0086] The adjustment component 400 needs to simultaneously satisfy two actions: implantation and adjustment, both of which must be completed within the limited space of the operation gap 143. The adjustment component 400 also needs to be self-locking after adjustment. In this embodiment, the adjustment component 400 includes a vertical box 410, a bidirectional screw 440, and an adjustment block 460. The vertical box 410 has a U-shaped top view. An implantation block 420 and an operation block 430 are installed on the top of the interior of the vertical box 410. The implantation block 420 is located above the operation block 430. A second implantation hole 421 is opened inside the implantation block 420, and an operation hole 431 is opened inside the operation block 430. The inner diameter of the second implantation hole 421 is larger than the inner diameter of the operation hole 431. The stop of the vertical box 410 is installed at the bottom of the upper stop block 142, and the implantation block 420 extends out of the vertical box 410 and into the operation gap 143.

[0087] The bottom of the vertical box 410 is fitted with a base block 445. The bottom end of the bidirectional screw 440 is rotatably mounted in the base block 445, and the top end is rotatably inserted into the operating hole 431. Two sets of adjusting blocks 460 are symmetrically threaded on the outer wall of the bidirectional screw 440. The two sets of adjusting blocks 460 are vertically slidably placed on the inner wall of the vertical box 410. Each set of adjusting blocks 460 has symmetrically arranged abutment posts 461 on both sides. The adjusting blocks 460 have a self-locking component 450 for locking the bidirectional screw 440.

[0088] In the above scheme:

[0089] 1. The rotation of the bidirectional screw 440 drives the two sets of adjusting blocks 460 to move inward synchronously. The contact post 461 transmits force to the locking component 500 through the inclined plane, realizing the precise adjustment of the thrust of the contact body 600 (which can be finely adjusted according to the fit requirements of the osteotomy block 810).

[0090] 2. The self-locking component 450 locks the position of the bidirectional screw 440 to prevent reset after adjustment, ensuring that the contact body 600 continuously fits the osteotomy block 810 and provides stable support.

[0091] 3. The U-shaped structure of the vertical box 410 cooperates with the upper stop block 142 to limit the vertical displacement of the adjusting component 400 and ensure the stability of the force transmission path.

[0092] 4. The implantation block 420 is designed to be located above the adjustment block 460, and the second implantation hole is larger than the operation hole 431. This allows the implantation rod to be connected to the implantation block 420 first for implantation, and then the socket wrench to be passed through the second implantation hole into the operation hole 431 for operation, thus satisfying two operational requirements.

[0093] The bidirectional screw 440 lacks a locking structure after adjustment, making it prone to reversal due to postoperative activity, which can cause the contact body 600 to loosen. To solve this problem, in this embodiment, the self-locking component 450 includes a rotating plate 441. The top of the bidirectional screw 440 is provided with the rotating plate 441. The interior of the rotating plate 441 has a hexagonal groove 442, and the outer wall of the rotating plate 441 has a toothed groove 443. A floating ring 451 is vertically slidably fitted on the outer wall of the rotating plate 441. The floating ring 451 is vertically slidably placed in the operating hole 431. The inner wall of the floating ring 451 has a toothed ring 452, which is vertically inserted into the toothed groove 443. Floating blocks 453 are symmetrically provided on the side walls of the floating ring 451. Movable grooves 432 are extended outward on both sides of the operating hole 431. The floating blocks 453 are vertically slidably placed in the movable grooves 432. A spring rod 454 is provided at the bottom end of the floating block 453.

[0094] In the above scheme: the toothed ring 452 of the floating ring 451 meshes with the toothed groove 443 of the rotating plate 441, and the spring rod 454 provides preload force, locking the bidirectional screw 440 under normal conditions (preventing reverse rotation); during surgery, the tool presses down on the floating ring 451, and the toothed ring 452 disengages from the toothed groove 443 to rotate and adjust. After adjustment, the spring rod 454 resets and relocks, realizing the integration of "adjustment-locking", ensuring the stability of the screw position and preventing the contact body 600 from loosening.

[0095] In this embodiment, the locking component 500 includes a vertical plate 510, which is horizontally inserted into the side opening of the vertical box 410. The top of the vertical plate 510 extends into the operating gap 143. A guide block 520 and a mating plate 530 are symmetrically provided on one side of the vertical plate 510. The guide block 520 is slidably inserted into the groove 411 on the inner wall of the vertical box 410. A spring 412 is embedded in the groove 411. The spring 412 is used to drive the guide block 520 to retract. The side cross section of the mating plate 530 is a right trapezoid. The abutment post 461 is located on the outside of the mating plate 530. The inclined surface of the mating plate 530 is in contact with the abutment post 461. The outer wall of the vertical plate 510 is provided with a locking tooth 540. The cross section of the locking tooth 540 is a right triangle, and the inclined surface of the locking tooth 540 faces upward.

[0096] In the above scheme: the locking teeth 540 (right-angled triangle, with the inclined surface facing up) of the vertical plate 510 engage with the mating teeth 620 (with the inclined surface facing down) of the contact body 600 in a one-way manner, allowing the contact body 600 to move outward (fitting the osteotomy block 810), preventing reverse rebound and vertical displacement.

[0097] In this embodiment, the abutment 600 includes a back plate 610, a middle block 630, and a support block 640. The back of the back plate 610 is provided with mating teeth 620. The side cross-section of the mating teeth 620 is a right triangle with the inclined surface facing down. Locking teeth 540 are inserted between adjacent mating teeth 620. The outer side of the back plate 610 is provided with the middle block 630. The outer side of the middle block 630 is provided with the support block 640. The support block 640 has a first through hole 310 and a second through hole 320 inside. The widths of the support block 640, the back plate 610, and the middle block 630 decrease sequentially. The width of the support block 640 is the same as the thickness of the upper handle 110. The back plate 610 enters the receiving cavity 140 through the insertion gap 144. The side baffles are slidably clamped on both sides of the middle block 630. The back of the support block 640 is provided with an inclined surface adapted to the inclined expansion surface 113.

[0098] In the above scheme:

[0099] 1. The inclined surface of the support block 640 (width is the same as that of the upper handle 110) is adapted to the inclined expansion surface 113 to increase the contact area with the osteotomy block 810 (distribute pressure) and avoid bone damage.

[0100] 2. The widths of the back plate 610 and the middle block 630 decrease sequentially, which facilitates entry into the receiving cavity 140 through the insertion gap 144. The side baffles clamp the middle block 630, restricting lateral displacement and ensuring that the support block 640 accurately contacts the osteotomy block 810.

[0101] After the upper fastening wire 700 is twisted, it is prone to bulging (affecting the flatness of the prosthesis surface), and the unidirectional winding fixation strength is insufficient, causing the osteotomy block 810 to easily shift anteriorly and posteriorly. To solve the above problems, in this embodiment, the top of the vertical plate 510 is symmetrically provided with a through-ring 550. The through-ring 550 is used to allow the two reinforcing extensions 710 of the upper fastening wire 700 of the osteotomy block 810 to pass through in an X-shape. After the two reinforcing extensions 710 pass through the through-ring 550, they are twisted together and inserted into the second implantation hole.

[0102] In the above scheme:

[0103] 1. The 550-inch ring is reinforced with steel wire and extends outward in an X-shape to form a cross constraint, which enhances the fixation strength of the osteotomy block 810 on the front and back sides; the twisted part is inserted into the second implantation hole to avoid surface protrusion (to ensure the flatness of the prosthesis) and reduce postoperative soft tissue irritation.

[0104] 2. The X-shaped twisted structure can disperse stress, reduce the risk of wire relaxation, and further improve the circumferential stability of the osteotomy block 810.

[0105] When assembling the femoral stem prosthesis in this embodiment before use:

[0106] Insert the vertical box 410 into the receiving cavity 140 through the insertion gap 144, and then push the vertical box 410 inward so that the vertical box 410 enters below the upper stop block 142, and the implant block 420 and the vertical plate are placed in the operating gap 143.

[0107] The back plate 610 of the contact body 600 is inserted into the receiving cavity 140 through the insertion gap 144, and the side baffle is clamped on both sides of the middle block 630 and placed between the support block 640 and the back plate 610.

[0108] During installation of the femoral stem prosthesis in this embodiment:

[0109] The doctor screws the implant rod into the second implantation hole 421, and then inserts the femoral stem prosthesis into the femur 800. During the insertion process, the extension 150 can increase the positioning depth. During the insertion process, the extension 150 deforms at the deformation groove 151, which can adapt to the need for the gradual narrowing of the middle channel of the femur 800. The deformed extension 150 can also resist the femur 800 in the opposite direction, improving the stability of the femoral stem prosthesis implantation.

[0110] Remove the implant rod; cover the cut greater trochanter osteotomy block 810 on the outside of the contact body 600, wrap an upper fastening wire 700 around the osteotomy block 810 and the outer wall of the femur 800 outside the upper handle 110, and finally twist it once to obtain the first twisted part 730, the twisted position is located on the outside of the osteotomized femur; twist multiple lower fastening wires 720 in a ring below the upper fastening wire 700;

[0111] A socket wrench (existing technology) is inserted through the second insertion hole. The socket of the wrench presses down on the floating ring 451, causing the floating ring 451 to move downward along the operating hole 431. The floating block 453 moves downward along the movable groove 432 and squeezes the spring rod 454. When the toothed ring 452 disengages from the toothed groove 443, the hexagonal post of the wrench inserts into the hexagonal groove 442. Turning the handle causes the hexagonal post to drive the rotating plate 441 to rotate, and the double-ended screw 440 drives the two sets of adjusting blocks 46. 0 moves inward synchronously, the contact column 461 moves outward against the mating plate 530, the guide block 520 moves outward along the slide groove 411 and stretches the spring 412, the locking tooth 540 of the vertical plate 510 is inserted into the mating tooth 620 of the back plate 610, and then the vertical plate 510 pushes the back plate 610 outward, the back plate 610 moves slightly in the receiving cavity 140 and pushes the support block 640 outward, so that the support block 640 can contact the inside of the osteotomy block 810 and straighten the upper fastening wire 700;

[0112] The first locking screw 311 and the second locking screw 321 pass through the support block 640 and are drilled into the osteotomy block 810;

[0113] The two reinforcing extensions 710 of the upper fastening wire 700 are passed through the two loops 550 in an X-shape from the front and rear sides of the osteotomy block 810. Then, the two reinforcing extensions 710 are twisted together to obtain the second twisted part 740. The second twisted part 740 can be inserted into the second implantation hole without protruding, ensuring the flatness of the prosthesis surface. The loops 550 can serve as a constraint structure for secondary twisting reinforcement. During secondary twisting, the upper fastening wire 700 can be further tightened, and the external front and rear constraint strength of the osteotomy block 810 can be improved.

[0114] 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.

[0115] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A femoral stem prosthesis for fixing osteotomy blocks of the greater trochanter of the femur, characterized in that, include: The handle body is positioned to the femur and osteotomy block by a set of upper fastening wires and multiple sets of lower fastening wires. The handle body includes an upper handle part, a lower handle part, and a neck. The vertical outer contour side of the upper handle part consists of a top oblique contact surface, a reserved surface, an oblique expansion surface, a bottom oblique contact surface, and a first inwardly curved surface connected end to end. The neck part is connected at the top oblique contact surface, and the lower handle part is connected at the bottom oblique contact surface. One side of the lower handle part is a third inwardly curved surface. The thickening unit fills the triangular area formed by the extended line of the reserved surface, the upward extended line of the third inward-curving surface, and the oblique expansion surface. The thickening unit has a first perforation and a second perforation. A guide is embedded in both the first and second perforations. A first locking screw passes through the first perforation, and a second locking screw passes through the second perforation. The first and second locking screws pass through the thickening unit and are drilled into the osteotomy block to reduce proximal displacement of the osteotomy block. The thickening unit is used to increase the lever arm of the hip abductor muscle and serve as a base for screw installation. An extension is provided at the bottom end of the lower handle. A cross-shaped deformation groove is provided at the bottom of the extension. The coronal depth of the deformation groove is greater than the sagittal depth. The first locking screw has an insertion angle of 35°, and the second locking screw has an insertion angle of 45°; the other side of the lower shank is a second inward-curving surface, the inward direction of the second inward-curving surface and the third inward-curving surface are opposite, the second inward-curving surface continues to the bottom of the first inward-curving surface, and the third inward-curving surface is connected to the bottom of the inclined expansion surface. The inclined expansion surface is a planar structure, and the angle between the reserved surface and the inclined expansion surface is greater than the angle between the reserved surface and the third inward-curving surface. A receiving cavity is provided at the top corner of the upper handle. The top opening of the receiving cavity is located at the reserved surface, and the side opening of the receiving cavity is located at the inclined expansion surface. The inner wall of the top opening is symmetrically provided with upper blocks near the neck end. The upper blocks are the operating gap. The area of ​​the top opening other than the operating gap is the insertion gap. The inner diameter of the insertion gap is larger than the inner diameter of the operating gap. The inner wall of the side opening is symmetrically provided with side blocks. The thickening unit includes an adjusting component, a locking component, and an abutment. The adjusting component is embedded in the receiving cavity. The main body of the adjusting component is stopped below the upper stop block. The side of the adjusting component is connected to the locking component. The locking component is horizontally slidable in the receiving cavity. The abutment is vertically inserted into the receiving cavity through the operating gap. The abutment slides horizontally within the receiving cavity with a small amplitude. The side baffle stops the abutment from the outside. The locking component is used to vertically lock the abutment from the inside and push the abutment to move horizontally so that the abutment fully fits the osteotomy block and tightens the fastening wire on the osteotomy block.

2. The femoral stem prosthesis for fixing the greater trochanter osteotomy block of the femur according to claim 1, characterized in that: The adjustment component includes a vertical box, a bidirectional screw, and an adjustment block. The vertical box has a U-shaped top view. An implant block and an operation block are installed at the top inside the vertical box. The implant block is located above the operation block. A second implant hole is opened inside the implant block. An operation hole is opened inside the operation block. The inner diameter of the second implant hole is larger than the inner diameter of the operation hole. The vertical box body stop is installed at the bottom of the upper stop block, and the implant block extends out of the vertical box body and into the operating gap; The bottom of the vertical box is fitted with a base block. The bottom end of the bidirectional screw is rotatably installed in the base block, and the top end is rotatably inserted into the operating hole. Two sets of adjusting blocks are symmetrically threaded on the outer wall of the bidirectional screw. The two sets of adjusting blocks slide vertically on the inner wall of the vertical box. Each set of adjusting blocks has symmetrical abutment posts on both sides. The adjusting blocks have a self-locking component for locking the bidirectional screw.

3. The femoral stem prosthesis for fixing the greater trochanter osteotomy block of the femur according to claim 2, characterized in that: The self-locking component includes a rotating plate. The top of the bidirectional screw is equipped with a rotating plate. The interior of the rotating plate has a hexagonal groove, and the outer wall of the rotating plate has a toothed groove. A floating ring is vertically slidably fitted on the outer wall of the rotating plate. The floating ring is vertically slidably placed in the operating hole. The inner wall of the floating ring has a toothed ring, which is vertically inserted into the toothed groove. Floating blocks are symmetrically arranged on the side wall of the floating ring. Movable grooves are extended outward on both sides of the operating hole. The floating blocks are vertically slidably placed in the movable grooves. A spring rod is provided at the bottom end of the floating block.

4. The femoral stem prosthesis for fixing the greater trochanter osteotomy block of the femur according to claim 3, characterized in that: The locking component includes a vertical plate, which is horizontally inserted into the side opening of the vertical box. The top of the vertical plate extends into the operating gap. A guide block and a mating plate are symmetrically arranged on one side of the vertical plate. The guide block is slidably inserted into a groove on the inner wall of the vertical box. A spring is embedded in the groove and is used to drive the guide block to retract. The mating plate has a right-angled trapezoidal cross section. The abutment post is located on the outside of the mating plate. The inclined surface of the mating plate is in contact with the abutment post. The outer wall of the vertical plate is provided with locking teeth. The cross section of the locking teeth is a right-angled triangle and the inclined surface of the locking teeth faces upward.

5. The femoral stem prosthesis for fixing the greater trochanter osteotomy block of the femur according to claim 4, characterized in that: The contact body includes a back plate, a middle block, and a support block. The back of the back plate is provided with mating teeth. The side cross-section of the mating teeth is a right triangle with the inclined surface facing down. The locking teeth are inserted between adjacent mating teeth. The outer side of the back plate is provided with the middle block. The outer side of the middle block is provided with the support block. The support block has a first through hole and a second through hole. The widths of the support block, the back plate, and the middle block decrease sequentially. The width of the support block is the same as the thickness of the upper handle. The back plate enters the receiving cavity through the insertion gap. The side baffles slide and clamp on both sides of the middle block. The back of the support block is provided with an inclined surface adapted to the inclined expansion surface.

6. The femoral stem prosthesis for fixing the greater trochanter osteotomy block of the femur according to claim 5, characterized in that: The top of the vertical plate is symmetrically provided with a through-ring. The through-ring is used to allow the two reinforcing extensions of the fastening wire on the osteotomy block to pass through in an X-shape. After the two reinforcing extensions pass through the through-ring, they are twisted together and put into the implantation hole.

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