A femoral stem component

Abstract

The present application discloses a femoral stem assembly, which belongs to the field of medical device technology, and comprises: a femoral stem main body, which is provided with a mounting hole along its length direction, and the mounting hole passes through the femoral stem main body; a support column, which is detachably connected to the mounting hole, and the support column can move along the mounting hole from the thick end of the femoral stem main body to the thin end of the femoral stem main body, and can pass through the thin end of the femoral stem to enter the femoral body. The side wall of the support column is provided with a plurality of locking screw holes that can be connected with locking screws. The present application can treat femoral body fractures caused by external force during femoral stem implantation surgery, and can reduce surgical trauma.

Description

Technical Field

[0001] The present application belongs to the field of medical device technology, and specifically relates to a femoral stem assembly. Background Art

[0002] The femur, also known as the thighbone, is the longest bone in the body, consisting of two distinct ends. The proximal end contains a rounded femoral head, two-thirds the size of a sphere, pointing inward and forward, forming the hip joint with the acetabulum. A small recess in the center of the femoral head is called the femoral fossa. The narrow section below the femoral head is the femoral neck. If a femoral head disease develops, requiring hemiarthroplasty, the stump of the modified femoral neck is reamed with a medullary cavity file to widen the medullary cavity. The femoral stem is then inserted into the medullary cavity. During insertion, the femoral stem is hammered to gradually enter the medullary cavity and secure it in place. However, in patients with advanced age or medical conditions, the femur is in poor condition. Because the middle portion of the femur is thinner than the ends, the femoral stem is susceptible to fracture due to external forces during insertion, potentially impacting the surgical procedure.

[0003] Since femoral body fracture occurs when the femoral stem is inserted into the medullary cavity, if the femoral body fracture is treated from the proximal end of the femur, the femoral stem will occupy the surgical space for femoral body treatment, and the femoral body treatment process will affect the progress of femoral stem insertion. If the treatment is performed at the distal end of the femur, a new surgical wound will be formed in the thigh skin, which will cause new damage to the patient and greatly affect the patient's health and recovery status. Summary of the Invention

[0004] In order to promptly address possible femoral fractures when implanting the femoral stem, ensure the normal implantation of the femoral stem, and avoid causing new surgical trauma to the patient, the present application provides a femoral stem assembly.

[0005] A femoral stem assembly comprises: a femoral stem body, the femoral stem body being provided with a mounting hole along its length direction, the mounting hole passing through the femoral stem body; a support column, the support column being detachably connected to the mounting hole, the support column being able to move along the mounting hole from the thick end of the femoral stem body to the thin end of the femoral stem body, and being able to pass through the thin end of the femoral stem to enter the femoral body, the side wall of the support column being provided with a plurality of locking screw holes that can be connected with locking screws.

[0006] The support column in the present application can move along the mounting hole from the thick end of the femoral stem body to the thin end of the femoral stem body, and pass through the thin end of the femoral stem body, thereby entering the femoral body, and passing through the femoral body to reach the end where the femoral body is connected to the lateral epicondyle. The support column connects the two broken sections of the femoral body or the location where cracks appear. The locking screw located on the outside passes through the fracture site and is connected to the locking screw hole in the medullary cavity, so that the fracture site can be fixed to the support column. At the same time, since the support column is detachably connected to the femoral stem body, the support column connected to the medullary cavity can reduce the displacement of the femoral stem in the medullary cavity, and the connection between the femoral stem and the femur is tighter.

[0007] In one embodiment of the present application, along the axial direction of the support column, the support column includes a fixed section provided with multiple locking screw holes and a connecting section connected to the fixed section, the side wall of the connecting section is provided with an external thread, the mounting hole is provided with an internal thread, and the connecting section can be threadedly connected to the mounting hole.

[0008] In one embodiment of the present application, the connecting section and the fixing section are coaxially arranged, and the connecting section and the fixing section are rotatably connected. The connecting section can rotate around the axis of the fixing section to be threadedly connected to the mounting hole.

[0009] By rotatably connecting the connecting section and the fixing section, the fixing section does not rotate when the connecting section is threadedly connected to the mounting hole, thereby preventing the fixing section from rotating in the femoral medullary cavity.

[0010] In one embodiment of the present application, the cross-section of the fixing section is non-circular; the mounting hole includes a working section provided with an internal thread and a pass-through section connected to the working section, and the working section and the pass-through section are connected in sequence along the direction from the thick end of the femoral stem body to the thin end of the femoral stem body, and the pass-through section passes through the thin end of the femoral stem body and communicates with the outside world; the cross-sectional shape of the pass-through section is the same as the cross-sectional shape of the fixing section, and the pass-through section can limit the rotation of the fixing section around the axis of the mounting hole.

[0011] The fixing section does not rotate around the axis of the mounting hole. The fixing section only moves along the axis of the mounting hole toward the thick end of the femoral stem body or the thin end of the femoral stem body, thereby preventing the fixing section from rotating in the femoral medullary cavity and causing damage to the femur.

[0012] In one embodiment of the present application, the support column includes a connecting section and a fixed section provided with a plurality of locking screw holes, the mounting hole includes a working section that can be connected to the connecting section, and a through-section that is coaxially arranged with the working section and connected to the working section, the through-section passes through the thin end of the femoral stem body and is connected to the outside world, and the working section and the through-section are connected in sequence along the direction from the thick end of the femoral stem body to the thin end of the femoral stem body; the diameter of the through-section is smaller than the diameter of the connecting section, and the through-section can limit the movement of the connecting section along the mounting hole toward the thin end of the femoral stem body.

[0013] Since the forces acting on the femur during human activities are relatively complex, the diameter of the protruding section is smaller than the diameter of the connecting section. The protruding section can limit the movement of the connecting section along the mounting hole toward the thin end of the femoral stem body, which can effectively prevent the support column from moving away from the femoral stem body. The femoral body is connected to the support column by a locking screw, so that the femoral body can limit the dislocation of the femoral stem body, making the connection between the femoral stem body and the femur tighter.

[0014] In one embodiment of the present application, a working hole for an aiming frame is provided on the outer surface of the thick end of the femoral stem body; along the axial direction of the support column, the support column includes a fixed section provided with a plurality of locking screw holes and a connecting section connected to the fixed section; the mounting hole includes a connecting section, and a working section that can be connected to the connecting section, and a passing section that passes through the thin end of the femoral stem body and communicates with the outside world, the connecting section passes through the thick end of the femoral stem body and communicates with the outside world, and points along the direction of the thin end of the femoral stem body to the femoral stem body, and the connecting section, the working section, and the passing section are connected in sequence; the end face of the support column is provided with a connecting groove; the femoral stem assembly also includes an aiming frame provided with a handle, the handle is provided with a first positioning connection part that can be connected to the connecting groove, the first positioning connection part can be inserted into the connecting section and connected to the connecting groove located in the working section; the handle also includes a second positioning connection part, which can be threadedly connected to the working hole of the aiming frame; the joint action of the first positioning connection part and the second positioning connection part can fix the aiming frame to the femoral stem body.

[0015] The handle of the aiming frame is connected to the femoral stem body at two positions through a first positioning connection part that can be inserted into the connecting section and connected to the connecting groove, and a second positioning connection part that is threadedly connected to the working hole of the aiming frame. The aiming frame handle can be tightly connected to the femoral stem body, making the relative position of the femoral stem body and the aiming frame more accurate, thereby ensuring the accuracy of the aiming frame positioning the locking threaded hole.

[0016] In one embodiment of the present application, the depth direction of the working hole of the aiming frame is the same as the direction from the thick end of the femoral stem body to the thin end of the femoral stem body, or the depth direction of the working hole of the aiming frame is perpendicular to the direction from the thick end of the femoral stem body to the thin end of the femoral stem body.

[0017] In one embodiment of the present application, a fixing groove is further provided on the outer surface of the thick end of the femoral stem body, which connects the connecting section and the working hole of the aiming frame; the handle also includes an embedded portion, which has the same shape as the fixing groove, and the first positioning connection portion is connected to the connecting groove, and when the second positioning connection portion is threadedly connected to the working hole of the aiming frame, the embedded portion can be embedded in the fixing groove.

[0018] The embedding portion can be embedded in the fixing groove, thereby preventing the aiming frame from rotating relative to the femoral stem, so that after the aiming frame is connected to the femoral stem, the position of the locking screw hole in the medullary cavity can be accurately reflected.

[0019] In one embodiment of the present application, a connecting groove is provided at one end of the support column, and the cross-section of the connecting groove is non-circular; the outer surface of the thick end of the femoral stem body is provided with a sealing piece connecting hole; the femoral stem assembly also includes a sealing piece, and the sealing piece includes a first fixing plate that can be connected to the sealing piece connecting hole, and a sealing rod connected to the first fixing plate; when the first fixing plate is connected to the sealing piece connecting hole, the sealing rod can be inserted into the connecting groove in the mounting hole through the mounting hole, the cross-section of the sealing rod is the same as the cross-section of the connecting groove, and the sealing rod can limit the rotation of the support column around the axis of the mounting hole.

[0020] The blocking rod can prevent the support column from rotating in the femoral medullary cavity.

[0021] In one embodiment of the present application, the connecting hole of the blocking member is a first threaded hole, and the depth direction of the first threaded hole is the same as the direction from the thick end of the femoral stem body to the thin end of the femoral stem body; the blocking member also includes a second fixing plate; the outer surface of the thick end of the femoral stem body is provided with a second threaded hole, and the depth direction of the second threaded hole is perpendicular to the direction from the thick end of the femoral stem body to the thin end of the femoral stem body; the side wall of the support column is provided with a matching hole, and the depth direction of the matching hole is the same as the radial direction of the support column; when the support column passes through the thin end of the femoral stem body along the mounting hole, the matching hole and the second threaded hole are coaxially arranged, and when the blocking rod is inserted into the connecting groove, the second fixing plate is connected with the matching hole and the second threaded hole.

[0022] The beneficial effects of this application are at least:

[0023] 1. The support column in the present application can move along the mounting hole from the thick end of the femoral stem body to the thin end of the femoral stem body, and pass through the thin end of the femoral stem body to enter the femoral body, and pass through the femoral body to reach the end where the femoral body is connected to the lateral epicondyle, connecting the two broken sections of the femoral body or the location where cracks appear. The locking screw located on the outside passes through the fracture site and is connected to the locking screw hole in the medullary cavity, so that the fracture site can be fixed to the support column. At the same time, since the support column is detachably connected to the femoral stem body, the support column connected to the medullary cavity can reduce the displacement of the femoral stem in the medullary cavity, and the connection between the femoral stem and the femur is tighter.

[0024] 2. By rotatably connecting the connecting section and the fixing section, when the connecting section is threadedly connected to the mounting hole, the fixing section does not rotate, thereby preventing the fixing section from rotating in the femoral medullary cavity.

[0025] 3. The handle of the aiming frame is connected to the femoral stem body at two positions through a first positioning connection part that can be inserted into the connecting section and connected to the connecting groove, and a second positioning connection part that is threadedly connected to the working hole of the aiming frame. The aiming frame handle can be tightly connected to the femoral stem body, making the relative position of the femoral stem body and the aiming frame more accurate, thereby ensuring the accuracy of the positioning of the locking threaded hole by the aiming frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of an exemplary embodiment of the present application;

[0027] Figure 2 is a schematic structural diagram of an exemplary embodiment of the mounting hole in this application;

[0028] Figure 3 is a schematic structural diagram of an exemplary embodiment of a support column in this application;

[0029] Figure 4 This is a structural diagram of an exemplary embodiment of the connection between the blocking member and the support column in the present application;

[0030] Figure 5 1 is a schematic structural diagram of an exemplary embodiment of the fixed segment and the penetration segment in the present application;

[0031] Figure 6 is a structural diagram of an exemplary embodiment of the first threaded hole in the present application;

[0032] Figure 7 is a schematic structural diagram of an exemplary embodiment of the sighting frame in the present application;

[0033] Figure 8 This is a schematic structural diagram of an exemplary embodiment of the connection between the aiming frame and the femoral stem body in the present application;

[0034] Figure 9 is a schematic structural diagram of an exemplary embodiment of a connecting column in the present application;

[0035] Figure 10 is a schematic structural diagram of an exemplary embodiment of an insertion column in the present application;

[0036] Figure 11 This is a structural diagram of an exemplary embodiment of the second positioning connection portion of the present application;

[0037] Figure 12 This is a schematic structural diagram of an exemplary embodiment of the blocking member in this application;

[0038] Figure 13This is a structural diagram of an exemplary embodiment in which the blocking member of the present application is provided with both a first fixing piece and a second fixing piece;

[0039] Figure 14 is a schematic structural diagram of an exemplary embodiment of the matching hole in this application;

[0040] Figure 15 It is a structural diagram of an exemplary embodiment of the connection between the blocking member and the support column in the present application.

[0041] In the picture:

[0042] 100, femoral stem body; 101, mounting hole; 102, connecting section; 103, working section; 104, exit section; 105, first threaded hole; 106, second threaded hole; 107, fixing groove;

[0043] 200, support column; 201, connecting section; 202, fixing section; 203, locking screw hole; 204, matching hole; 205, rotating shaft; 206, connecting sink;

[0044] 300, blocking member; 301, first fixing plate; 302, second fixing plate; 303, blocking rod;

[0045] 400, aiming frame; 401, handle; 402, connecting column; 403, insertion column; 404, second positioning connection part. DETAILED DESCRIPTION

[0046] In order to have a clearer understanding of the technical features, purposes and effects of the present application, the specific implementation methods of the present application are now described with reference to the accompanying drawings. The same reference numerals in the drawings represent components with the same structure or similar structures but the same functions.

[0047] In this document, “illustrative” means “serving as an example, instance or illustration”, and any diagram or implementation described in this document as “illustrative” should not be interpreted as a more preferred or more advantageous technical solution.

[0048] To simplify the drawings, only the parts related to the present application are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically shown or labeled.

[0049] See Figures 1 to 15 To better understand this application, Figure 9 、 Figure 14 、 Figure 15 No hatching is drawn.

[0050] See also Figure 1 、 Figure 2 A femoral stem assembly comprises a femoral stem body 100, a mounting hole 101 is provided along the length direction of the femoral stem body 100, the mounting hole 101 passes through the femoral stem body 100, and the mounting hole 101 is from the thick end ( Figure 1 The position shown in A in FIG) is directed to the thin end of the femoral stem body 100 ( Figure 1 support column 200, the support column 200 is detachably connected to the mounting hole 101, the support column 200 can be along the mounting hole 101, from the thick end of the femoral stem body 100 ( Figure 1 The position shown in A in FIG) is directed to the thin end of the femoral stem body 100 ( Figure 1 B in FIG) and can pass through the thin end of the femoral stem body 100, see Figure 4 , in order to enter the femoral body, the side wall of the support column 200 is provided with a plurality of locking screw holes 203 that can be connected with locking screws.

[0051] See also Figure 1 、 Figure 2 In one embodiment of the present application, along the axial direction of the support column 200, the support column 200 includes a fixing section 202 provided with a plurality of locking screw holes 203 and a connecting section 201 connected to the fixing section 202, the side wall of the connecting section 201 is provided with an external thread, and the mounting hole 101 is provided with an internal thread, and the connecting section 201 can be threadedly connected to the mounting hole 101. After the femoral stem body 100 is installed on the femur, the support column 200 is inserted into the mounting hole 101 from the thick end of the femoral stem body 100. As the support column 200 moves along the mounting hole 101, the connecting section 201 reaches the internal thread in the mounting hole 101, so that the connecting section 201 rotates, and the connecting section 201 is threadedly connected to the internal thread in the mounting hole 101. As the connecting section 201 rotates, the fixing section 202 extends from the thin end of the femoral stem body 100 through the mounting hole 101 into the femoral body. In the process, after the connecting section 201 rotates to a certain angle, the fixing section 202 reaches the distal end of the femur, and the locking screw hole 203 and the locking screw provided on the fixing section 202 are used to fix the cracked or broken femoral body on the fixing section 202, thereby fixing the fractured or broken femur. Since the femoral stem body 100 has been installed at the proximal end of the femur, the support column 200 is connected to the femoral stem body 100, so that the distal end of the femur and the proximal end of the femur can be re-established with the correct connection relationship through the support column 200. As the bones grow, the femoral bodies grow together again, thereby treating the femoral body fractures that occur during the femoral stem surgery; the femoral stem body 100 and the support column 200 are connected by threads, so that the effective contact area between the two is larger, and the stability of the connection can still be guaranteed under the complex force environment of the femur.

[0052] By threading the connecting section 201 to the mounting hole 101, the length of the internal thread in the mounting hole 101 can be set so that the connecting section 201 cannot continue to rotate at the end of the internal thread in the mounting hole 101, thereby limiting the final position of the connecting section 201 in the mounting hole 101 and preventing the fixing section 202 from excessively extending into the femoral body.

[0053] Furthermore, the connecting section 201 and the fixing section 202 are coaxially arranged, and the connecting section 201 and the fixing section 202 are rotatably connected. The connecting section 201 can rotate around the axis of the fixing section 202 to be threadedly connected to the mounting hole 101. Figure 3 The fixed section 202 is connected to the connecting section 201 through a rotating shaft 205. The rotating shaft 205 is coaxially arranged with the fixed section 202. One end of the rotating shaft 205 is fixedly connected to the fixed section 202, and the other end is slidably connected to the connecting section 201. The diameter of the end of the rotating shaft 205 increases along the direction of the fixed section 202 pointing to the connecting section 201. The connecting section 201 is provided with a shape that matches the rotating shaft 205, thereby limiting the separation of the rotating shaft 205 from the connecting section 201 and preventing the connecting section 201 from moving along the axis of the rotating shaft 205. The connecting section 201 can only rotate around the axis of the rotating shaft 205. When the connecting section 201 rotates around the rotating shaft When the axis of 205 rotates, the connecting section 201 can be connected to the internal thread in the mounting hole 101, so that as the connecting section 201 rotates, the connecting section 201 can drive the fixing section 202 to move along the mounting hole 101 toward the thin end of the femoral stem body 100, or toward the thick end of the femoral stem body 100. During this process, the fixing section 202 can stop rotating, thereby avoiding damage to the femoral medullary cavity due to the rotation of the fixing section 202. During this process, neither the femoral stem body 100 nor the fixing section 202 rotates, and the fixing section 202 only moves along the axis direction of the mounting hole 101, thereby effectively protecting the femoral medullary cavity.

[0054] Technicians in the technical field to which this application belongs can understand that there are many ways to drive the connecting section 201 to rotate. The end face of the connecting section 201 is provided with a connecting groove 206, and the cross-section of the connecting groove 206 is a regular hexagon, so that the instrument can extend from the thick end of the femoral stem body 100 into the mounting hole 101, driving the connecting section 201 to rotate around the axis of the fixed section 202. Of course, the cross-section of the connecting groove 206 can be other non-circular shapes, such as a triangle, a quadrilateral, etc., and the instrument can drive the connecting section 201 to rotate through the connecting groove 206.

[0055] Furthermore, the cross section of the fixing section 202 is non-circular; the mounting hole 101 includes a working section 103 provided with an internal thread and a through-section 104 connected to the working section 103, and the working section 103 and the through-section 104 are connected in sequence along the direction from the thick end of the femoral stem body 100 to the thin end of the femoral stem body 100; the cross-sectional shape of the through-section 104 is the same as that of the fixing section 202, and the through-section 104 can limit the rotation of the fixing section 202 around the axis of the mounting hole 101, see Figure 5 The cross sections of the through-section 104 and the fixed section 202 are both D-shaped, and the side wall of the fixed section 202 is tightly fitted with the inner wall of the through-section 104. When the connecting section 201 rotates around the axis of the fixed section 202, the inner wall of the through-section 104 exerts a force on the fixed section 202, limiting the rotation of the fixed section 202 around the axis of the fixed section 202, thereby preventing the fixed section 202 from rotating in the medullary cavity due to the rotation of the connecting section 201, or preventing the normal movement of the human body from causing the fixed section 202 to rotate. At the same time, since the fixing segment 202 is connected to the femur through the locking screw, and the fixing segment 202 is connected to the femoral stem body 100 through the connecting segment 201, the fixing segment 202 can limit the movement of the femoral stem body 100, so that the fixing segment 202 and the femoral stem body 100 interact with each other and strengthen the connection between the femur, so that the connection between the femoral stem body 100, the fixing segment 202 and the femur is tighter, and the femoral stem body 100 and the fixing segment 202 have a better fixation effect on the femur, which is beneficial to the healing of the femur.

[0056] Those skilled in the art of the present application will appreciate that the cross-sectional shapes of the protruding section 104 and the fixed section 202 in the present application are not limited to a "D" shape, but may also be an ellipse, a triangle, a quadrilateral, etc., or may be the side wall of the fixed section 202, with a guide groove provided along the extension direction of the fixed section 202. The protruding section 104 has a shape that fits the surface of the side wall of the fixed section 202, so that the inner wall of the protruding section 104 and the outer wall of the fixed section 202 can fit tightly together, thereby limiting the rotation of the fixed section 202 around its own axis.

[0057] See also Figure 2 、 Figure 4In one embodiment of the present application, the support column 200 includes a connecting section 201 with an external thread on the side wall and a fixing section 202 with a plurality of locking screw holes 203; the mounting hole 101 includes a working section 103 that can be threadedly connected to the connecting section 201, and a through-out section 104 that passes through the thin end of the femoral stem body 100 and communicates with the outside world. The working section 103 and the through-out section 104 are connected in sequence along the direction from the thick end of the femoral stem body 100 to the thin end of the femoral stem body 100; the diameter of the through-out section 104 is smaller than the diameter of the connecting section 201, and the through-out section 104 can limit The connecting section 201 moves along the mounting hole 101 toward the thin end of the femoral stem body 100. Since the force acting on the femur is relatively complicated, the diameter of the through-section 104 is smaller than the diameter of the connecting section 201. The through-section 104 can limit the movement of the connecting section 201 along the mounting hole 101 toward the thin end of the femoral stem body 100, which can effectively prevent the support column 200 from moving away from the femoral stem body 100. The femoral body is connected to the support column 200 by a locking screw, so that the femoral body can limit the dislocation of the femoral stem body 100, making the connection between the femoral stem body 100 and the femur tighter.

[0058] The threaded connection method of the connecting section 201 and the working section 103 described above makes it easier for medical staff to obtain the position of the connecting section 201 relative to the femoral stem body 100, thereby obtaining the depth of the fixing section 202 entering the femur. At the same time, it facilitates the tight connection between the support column 200 and the femoral stem body 100. Technical personnel in the technical field to which this application belongs can understand that the connection method of the support column 200 and the mounting hole 101 in this application is not limited to the connection method described above, but can also be that the side wall of the support column 200 is provided with a screw hole and the femoral stem body 100 is provided with a through hole, and the bolt passes through the through hole of the femoral stem body 100 and is threadedly connected to the screw hole provided on the support column 200, thereby fixing the relative position of the support column 200 and the mounting hole 101.

[0059] Technicians in the technical field to which this application belongs can understand that the support column 200 can have different lengths to accommodate femurs of different lengths. Of course, when the femur is not fractured, filler can be added to the mounting hole 101 of the femoral stem body 100, or a support column 200 of a certain length can be connected to the mounting hole 101. The support column 200 does not reach the distal end of the femur through the thin end of the femoral stem body 100.

[0060] In one embodiment of the present application, the outer surface of the thick end of the femoral stem body 100 is provided with an aiming frame working hole, see Figure 6 The first threaded hole 105 is the working hole of the sight frame, see Figure 7, the depth direction of the working hole of the aiming frame, that is, the depth direction of the first threaded hole 105 is the same as the direction in which the thick end of the femoral stem body 100 points to the thin end of the femoral stem body 100; the mounting hole 101 includes a connecting section 102, and a working section 103 that can be connected to the connecting section 201, and a passing section 104 that passes through the thin end of the femoral stem body 100 and communicates with the outside world. The connecting section 102 passes through the thick end of the femoral stem body 100 and communicates with the outside world. Along the direction from the thick end of the femoral stem body 100 to the thin end of the femoral stem body 100, the connecting section 102, the working section 103, and the passing section 104 are connected in sequence; the end face of the support column 200 is provided with a connecting groove 206, see Figure 1 , the cross section of the connecting groove 206 is a hexagon. Of course, the cross section of the connecting groove 206 can be in other shapes; the femoral stem assembly also includes an aiming frame 400 having a handle 401, see Figure 7 The handle 401 is provided with a first positioning connection portion that can be connected to the connecting groove 206. The first positioning connection portion includes a connecting column 402 and an insertion column 403. The outer diameter of the connecting column 402 is equal to the inner diameter of the connecting section 102. The cross-sectional shape of the insertion column 403 is the same as the cross-sectional shape of the connecting groove 206. The first positioning connection portion can be inserted into the connecting section 102. The connecting column 402 extends into the connecting section 102. The insertion column 403 is connected to the connecting groove 206 located in the working section 103; the handle 401 also includes a second positioning connection portion 404. The second positioning connection portion 404 is provided with a through hole. The bolt can pass through the through hole provided in the second positioning connection portion 404 and be threadedly connected to the first threaded hole 105. Figure 6 、 Figure 7 , so that the second positioning connection part 404 can be threadedly connected to the working hole of the aiming frame; the joint action of the first positioning connection part and the second positioning connection part 404 can fix the aiming frame 400 to the femoral stem body 100.

[0061] When the support column is connected to the mounting hole through a threaded connection, due to the influence of factors such as thread pitch, thread length, and helix angle, the position of the connecting section 201 of the support column 200 reaching the end of the internal thread in the mounting hole 101 is fixed, the depth of the connecting groove 206 in the mounting hole and the rotation angle are fixed, and the posture of the connecting groove 206 in the mounting hole is fixed, so that the connection position of the connecting groove 206 and the insertion column 403 relative to the mounting hole 101 is fixed, and due to the cross-section of the connecting groove 206, the connecting groove 206 has a function of limiting the rotation of the insertion column, thereby affecting the posture of the aiming frame in space, and having a positioning effect on the aiming frame, so that the aiming frame can more accurately position the locking screw hole.

[0062] See also Figures 6 to 11, those skilled in the art of the present application will understand that the depth direction of the aiming frame working hole can also be other directions, such as the depth direction of the aiming frame working hole is perpendicular to the direction from the thick end of the femoral stem body 100 to the thin end of the femoral stem body 100, see Figure 7 The second threaded hole 106 is the working hole of the aiming frame, and the second positioning connection part 404 can be connected to the second threaded hole 106. Technicians in the technical field to which this application belongs can understand that the number of working holes of the aiming frame in this application is not limited to one, and can also be other numbers. For example, the first threaded hole 105 and the second threaded hole 106 are both the working holes of the aiming frame, and there are two second positioning connection parts 404, which are respectively connected to the first threaded hole 105 and the second threaded hole 106. Of course, there can also be other numbers, which will not be repeated here.

[0063] For further information, see Figure 13 The outer surface of the thick end of the femoral stem body 100 is further provided with a fixing groove 107, which connects the aiming frame working hole and the connecting section 102; the handle 401 also includes an embedded portion, which has the same shape as the fixing groove 107, the first positioning connection portion is connected to the connecting groove 206, and the second positioning connection portion 404 is threadedly connected to the aiming frame working hole. The embedded portion can be inserted into the fixing groove 107, see Figure 8 .

[0064] The handle 401 is connected to the connecting groove 206, the aiming frame working hole, and the fixing groove 107, which can effectively prevent the aiming frame 400 from shaking or rotating after being connected to the femoral stem body. The aiming frame 400 can more accurately position the locking screw hole 203 in the medullary cavity, facilitate the connection between the locking screw outside the body and the support column 200 in the medullary cavity, and ensure the accuracy of the aiming frame 400 positioning the locking screw hole 203 on the support column 200.

[0065] See also Figures 12 to 15 In one embodiment of the present application, one end of the support column 200 is provided with a connecting groove 206, and the cross-section of the connecting groove 206 is non-circular; the outer surface of the thick end of the femoral stem body 100 is provided with a blocking piece connecting hole, and the blocking piece connecting hole is a first threaded hole 105. The outer surface of the thick end of the femoral stem body 100 is provided with a first threaded hole 105, and the depth direction of the first threaded hole 105 is the same as the direction from the thick end of the femoral stem body 100 to the thin end of the femoral stem body 100; the femoral stem assembly also includes a blocking piece 300, and the blocking piece 300 includes a first fixing plate 301 connected to the first threaded hole 105 and a blocking rod 303 connected to the first fixing plate 301, see Figure 12The first fixing plate 301 is provided with a through hole, and a bolt can pass through the through hole provided in the first fixing plate 301 and be threadedly connected to the first threaded hole 105, so that the first fixing plate 301 is connected to the first threaded hole 105; when the first fixing plate 301 is connected to the first threaded hole 105, the blocking rod 303 can enter the mounting hole 101 and be inserted into the connecting groove 206 in the mounting hole 101. The cross section of the blocking rod 303 is the same as the cross section of the connecting groove 206. When the blocking rod 303 is inserted into the connecting groove 206, the side wall of the blocking rod 303 is tightly against the inner side wall of the connecting groove 206. Due to the shape of the cross section of the blocking rod 303 and the shape restriction of the cross section of the connecting groove 206, the blocking rod 303 can limit the support column 200 from rotating around the axis of the mounting hole 101.

[0066] In one embodiment of the present application, the blocking member 300 further includes a second fixing piece 302, see Figure 12 The outer surface of the butt end of the femoral stem body 100 is provided with a second threaded hole 106, see Figure 13 The depth direction of the second threaded hole 106 is perpendicular to the direction from the thick end of the femoral stem body 100 to the thin end of the femoral stem body 100; the side wall of the support column 200 is provided with a matching hole 204, see Figure 1 、 Figure 4 、 Figure 14 When the fixing rod 303 is inserted into the connecting groove 206, the second fixing plate 302 is provided with a through hole, and the bolt passes through the through hole of the second fixing plate 302 and is threadedly connected with the second threaded hole 106. As the bolt penetrates deeper into the second threaded hole 106, the bolt enters the matching hole 204 of the supporting column 200, thereby connecting the second fixing plate 302 with the matching hole 204 and the second threaded hole 106 through the bolt. Since the first threaded hole 105 and the second threaded hole 106 are perpendicular to each other, the movement of the supporting column 200 can be restricted by the first threaded hole 105 and the second threaded hole 106, thereby ensuring the stability of the connection between the supporting column 200 and the femoral stem body 100. The blocking member 300 limits the movement of the support column 200 through the first fixing plate 301, the second fixing plate 302, and the blocking rod 303, ensuring the use effect of the present application on the femur that can produce complex movements.

[0067] Preferably, the mating hole 204 is provided in the connecting section 201 of the support column 200, and the bolt can limit the rotation of the connecting section 201 and the axial movement of the connecting section 201 along the mating hole 204, thereby making the connection between the support column 200 and the femoral stem body 100 tighter.

[0068] Preferably, a fixing groove 107 is provided on the surface of the femoral stem body 100, and the first fixing plate 301 and the second fixing plate 302 can be embedded in the fixing groove 107, thereby ensuring that the surface of the femoral stem body 100 is smooth. At the same time, the fixing groove 107 can limit the movement of the blocking member 300 to prevent the blocking member 300 from shifting. Moreover, since the first threaded hole 105 and the second threaded hole 106 are perpendicular to each other, the extension direction of the first fixing plate 301 is perpendicular to the direction from the thick end of the femoral stem body to the thin end of the femoral stem body, and the extension direction of the second fixing plate 302 is the same as the direction from the thick end of the femoral stem body to the thin end of the femoral stem body. The first fixing plate 301 and the second fixing plate 302 are perpendicular to each other, which strengthens the connection effect between the first fixing plate 301, the second fixing plate 302 and the femoral stem body 100.

[0069] Technicians in the technical field to which this application belongs can understand that the depth direction of the blocking piece connection hole in this application can also be perpendicular to the direction from the thick end of the femoral stem body to the thin end of the femoral stem body, that is, the depth direction of the blocking piece connection hole is the same as the depth direction of the second threaded hole 106, and the position of the first fixing plate 301 is adaptively adjusted following the position change of the blocking piece connection hole, which will not be repeated here.

[0070] It should be understood that although this specification is described according to various implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0071] The series of detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present application. They are not intended to limit the scope of protection of the present application. Any equivalent implementation plans or changes that do not depart from the technical spirit of the present application, such as the combination, division or repetition of features, should be included in the scope of protection of the present application.

Claims

1. A femoral stem assembly, characterized in that: include: A femoral stem body, wherein the femoral stem body is provided with a mounting hole along its length, and the mounting hole passes through the femoral stem body; A support column, the support column is detachably connected to the mounting hole, the support column can move along the mounting hole from the thick end of the femoral stem body to the thin end of the femoral stem body, and can pass through the thin end of the femoral stem to enter the femoral body, and the side wall of the support column is provided with a plurality of locking screw holes that can be connected to locking screws; Along the axis direction of the support column, the support column includes a fixing section provided with a plurality of locking screw holes and a connecting section connected to the fixing section, the side wall of the connecting section is provided with an external thread, the mounting hole is provided with an internal thread, and the connecting section can be threadedly connected to the mounting hole; The connecting section is coaxially arranged with the fixing section, and the connecting section and the fixing section are rotatably connected. The connecting section can rotate around the axis of the fixing section to be threadedly connected with the mounting hole; The cross section of the fixing section is non-circular; The mounting hole includes a working section provided with an internal thread and a passing section connected to the working section, and points from the thick end of the femoral stem body to the thin end of the femoral stem body. The working section and the passing section are connected in sequence, and the passing section passes through the thin end of the femoral stem body and communicates with the outside world; The cross-sectional shape of the protruding section is the same as that of the fixing section, and the protruding section is capable of limiting the fixing section from rotating around the axis of the mounting hole; The femoral stem assembly comprises two support columns, wherein the length of the fixed section of one support column is greater than the length of the fixed section of the other support column; The support column includes a connecting section and a fixing section provided with a plurality of locking screw holes; The mounting hole includes a working section that can be connected to the connecting section, and a passing section that is coaxially arranged with the working section and communicates with the working section, the passing section passes through the thin end of the femoral stem body and communicates with the outside world, and the working section and the passing section are connected in sequence along the direction from the thick end of the femoral stem body to the thin end of the femoral stem body; The diameter of the protruding section is smaller than the diameter of the connecting section, and the protruding section can limit the movement of the connecting section along the mounting hole toward the thin end of the femoral stem body.

2. A femoral stem assembly according to claim 1, characterized in that: The outer surface of the thick end of the femoral stem body is provided with a working hole for the aiming frame; Along the axial direction of the support column, the support column includes a fixing section provided with a plurality of locking screw holes and a connecting section connected to the fixing section; The mounting hole includes a connecting section, a working section that can be connected to the connecting section, and a passing section that passes through the thin end of the femoral stem body and communicates with the outside world. The connecting section passes through the thick end of the femoral stem body and communicates with the outside world. The connecting section, the working section, and the passing section are connected in sequence along the direction from the thick end of the femoral stem body to the thin end of the femoral stem body. The end surface of the support column is provided with a connecting groove. The femoral stem assembly further includes an aiming frame provided with a handle, wherein the handle is provided with a first positioning connection portion capable of connecting to the connecting groove, and the first positioning connection portion can be inserted into the connecting section and connected to the connecting groove located in the working section; The handle further comprises a second positioning connection portion, which can be threadedly connected to the working hole of the sighting frame; The first positioning connection portion and the second positioning connection portion work together to fix the aiming frame to the femoral stem body.

3. A femoral stem assembly according to claim 2, characterized in that: The depth direction of the aiming frame working hole is the same as the direction from the thick end of the femoral stem body to the thin end of the femoral stem body, or the depth direction of the aiming frame working hole is perpendicular to the direction from the thick end of the femoral stem body to the thin end of the femoral stem body.

4. A femoral stem assembly according to claim 3, characterized in that: The outer surface of the thick end of the femoral stem body is further provided with a fixing groove, and the fixing groove is connected with the connecting section and the working hole of the aiming frame; The handle also includes an embedded portion, which has the same shape as the fixing groove. When the first positioning connection portion is connected to the connecting groove and the second positioning connection portion is threadedly connected to the working hole of the sighting frame, the embedded portion can be inserted into the fixing groove.

5. The femoral stem assembly according to claim 1, characterized in that: One end of the support column is provided with a connecting groove, and the cross section of the connecting groove is non-circular; The outer surface of the butt end of the femoral stem body is provided with a sealing member connection hole; The femoral stem assembly further includes a blocking piece, the blocking piece including a first fixing plate that can be connected to the blocking piece connection hole, and a blocking rod connected to the first fixing plate; When the first fixing plate is connected to the connecting hole of the sealing member, the sealing rod can be inserted into the connecting groove in the mounting hole through the mounting hole. The cross section of the sealing rod is the same as the cross section of the connecting groove. The sealing rod can limit the rotation of the support column around the axis of the mounting hole.

6. The femoral stem assembly according to claim 5, characterized in that: The blocking member connection hole is a first threaded hole, and the depth direction of the first threaded hole is the same as the direction from the thick end of the femoral stem body to the thin end of the femoral stem body; The blocking member further includes a second fixing piece; A second threaded hole is provided on the outer surface of the butt end of the femoral stem body, and the depth direction of the second threaded hole is perpendicular to the direction from the butt end of the femoral stem body to the thin end of the femoral stem body; The side wall of the support column is provided with a matching hole, and the depth direction of the matching hole is the same as the radial direction of the support column; When the support column passes through the thin end of the femoral stem body along the mounting hole, the matching hole and the second threaded hole are coaxially arranged. When the blocking rod is inserted into the connecting groove, the second fixing plate is connected to the matching hole and the second threaded hole.

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