Femoral stem prosthesis implant

Abstract

The present invention discloses a femoral stem prosthesis implanter, which relates to the technical field of orthopedic surgical instruments. The femoral stem prosthesis implanter includes an implanter body; when in use, the implanter body is connected to the femoral stem prosthesis, and a connector is provided at the lower end of the implanter body. The connector includes at least two petal structures. When the petal structures are close together, the outer surface of the connector is a spherical structure. An operating rod is provided axially inside the implanter body. The operating rod can move back and forth along the axial direction of the implanter body. When the operating rod moves toward the connector, it can drive each petal structure to open outward. The connector cannot pass through the opening of the holding hole on the femoral stem prosthesis. When the operating rod moves in a direction away from the connector, each petal structure is close together, and the connector can enter and exit the holding hole. The petal structure with a spherical surface in the present invention can reduce the shaking conduction between the implanter and the femoral stem prosthesis, which helps to improve the fixation effect of the bone cement femoral stem prosthesis.

Description

Technical Field

[0001] The present invention relates to the technical field of orthopedic surgical instruments, and in particular to a femoral stem prosthesis implanter. Background Art

[0002] During hip surgery, a cement-stem prosthesis requires the use of a matching implant device to complete implantation and maintain the curing effect of the bone cement. Traditional implant devices rely on a threaded lock to secure the femoral prosthesis. Multiple turns of the thread are required during operation, and the prosthesis and implant device are securely connected. However, during operation, the implant device is prone to shaking with the operator's hand, which transmits this shaking to the bone cement surrounding the prosthesis, resulting in poor fixation and the creation of gaps. It also leads to uneven thickness of the cement sheath, making traditional implant devices unable to achieve optimal bone cement fixation. Summary of the Invention

[0003] In order to overcome the shortcomings of the existing technology, a femoral stem prosthesis implant is proposed.

[0004] A femoral stem prosthesis implanter of the present invention includes an implanter body; when in use, the implanter body is connected to the femoral stem prosthesis, and a connecting head is provided at the lower end of the implanter body, and the connecting head includes at least two petal-like structures. When the petal-like structures are close to each other, the connecting head is a spherical structure. An operating rod is axially provided in the implanter body, and the operating rod can reciprocate along the axial direction of the implanter body. When the operating rod moves toward the connecting head, it can drive each of the petal-like structures to open outward, and the connecting head cannot pass through the opening of the holding hole on the femoral stem prosthesis. When the operating rod moves in a direction away from the connecting head, each of the petal-like structures is close to each other, and the connecting head can enter and exit the holding hole.

[0005] As a preferred solution of the above-mentioned femoral stem prosthesis implanter: when the petal-like structures are close together, the interior of the connector is a solid structure.

[0006] As a preferred solution of the above-mentioned femoral stem prosthesis implanter: the outer surface of the petal-like structure is mirror-finished.

[0007] As a preferred solution of the above-mentioned femoral stem prosthesis implanter: when the operating rod is connected to the femoral stem prosthesis through the connecting head and the holding hole, the implanter body can swing within an angle range of 0°-30° relative to the femoral stem prosthesis.

[0008] As a preferred solution of the above-mentioned femoral stem prosthesis implanter: a notch is provided at the position where each petal-like structure interacts with the operating rod, and when the petal-like structures are brought together, the corresponding notches are combined to form a groove, and the groove is located on the extension line of the operating rod.

[0009] As a preferred solution of the above-mentioned femoral stem prosthesis implanter: a control pin is provided on the operating rod, and a through positioning groove is provided on the side wall of the implanter body. The control pin passes through the positioning groove and out of the implanter body. The control pin can stay at different positions of the positioning groove along the axial direction of the implanter body.

[0010] As a preferred solution of the above-mentioned femoral stem prosthesis implanter: the positioning groove includes at least two gear grooves, the gear grooves are distributed along the axial direction of the implanter body, each of the gear grooves is opened along the circumference of the implanter body, and adjacent gear grooves are connected by a connecting groove.

[0011] As a preferred solution of the above-mentioned femoral stem prosthesis implanter: a sliding hole is provided along the central axis in the implanter body, the operating rod is provided in the sliding hole, and the sliding hole is a blind hole opened from one end of the implanter body close to the connecting head to the other end.

[0012] As a preferred solution of the above-mentioned femoral stem prosthesis implanter: a spring is provided at the blind end of the sliding hole, and two ends of the spring respectively abut against the operating rod and the blind end of the sliding hole.

[0013] As a preferred solution of the above-mentioned femoral stem prosthesis implanter: the implanter body includes an implant rod and a handle, one end of the implant rod is connected to the connector, and the other end is connected to the handle.

[0014] Beneficial effects of the present invention:

[0015] In the present invention, when the implanter main body is connected to the femoral stem prosthesis, the three petal-like structures are first brought together, the connecting head is inserted into the holding hole, and then the operating rod is used to press the connecting head to cause the petal-like structure to expand outward, so that the petal-like structure is stuck in the holding hole and cannot escape from the opening of the holding hole, thereby realizing the connection between the implanter and the femoral stem prosthesis; in addition, when the petal-like structure with a spherical surface is connected in the holding hole, even if the implanter shakes during the implantation process, the petal-like structure with a spherical surface can reduce the shaking transmission between the implanter and the femoral stem prosthesis, which helps to improve the fixation effect of the bone cement femoral stem prosthesis. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the femoral stem prosthesis implanter of the present invention.

[0017] Figure 2 is a schematic diagram of the femoral stem prosthesis implanter of the present invention when in use;

[0018] Figure 3 A schematic diagram of the femoral stem prosthesis implanter of the present invention swinging relative to the femoral stem prosthesis;

[0019] Figure 4 This is a schematic diagram of the femoral stem prosthesis implanter of the present invention when the control pin is located in the first gear slot;

[0020] Figure 5 A cross-sectional view of the femoral stem prosthesis implanter of the present invention when the control pin is located in the first gear slot;

[0021] Figure 6 This is a schematic diagram of the positional relationship between the operating lever and the connector when the control pin is located in the first gear slot;

[0022] Figure 7 It is a schematic diagram of the femoral stem prosthesis implanter of the present invention when the control pin is located in the second gear slot;

[0023] Figure 8 A cross-sectional view of the femoral stem prosthesis implanter of the present invention when the control pin is located in the second gear slot;

[0024] Figure 9 This is a schematic diagram of the relationship between the connector, the operating lever, and the grip hole bracket when the control pin is located in the second gear slot.

[0025] 0. Femoral stem prosthesis; 01. Holding hole;

[0026] 1. Implanter body; 11. Implant rod; 12. Handle; 13. Positioning slot; 131. First gear slot; 132. Second gear slot; 133. Connecting slot; 14. Slide hole; 15. Spring;

[0027] 2. Connector; 21. Petal-shaped structure; 22. Groove;

[0028] 3. Operating lever; 31. Control pin. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] like Figures 1 to 9As shown, a femoral stem prosthesis implanter includes an implanter body 1; when in use, the implanter body 1 is connected to the femoral stem prosthesis 0, and a connector 2 is provided at the lower end of the implanter body 1. The connector 2 includes three petal structures 21, each petal structure 21 is hinged to the implanter body 1, and the three petal structures 21 are of the same size and close to each other when the connector 2 is in a spherical structure. An operating rod 3 is provided axially inside the implanter body 1, and the operating rod 3 can reciprocate along the axial direction of the implanter body 1. When the operating rod 3 moves toward the connector 2, it can drive each petal structure 21 to open outward, and the connector 2 cannot pass through the opening of the holding hole 01 on the femoral stem prosthesis 0. When the operating rod 3 moves in a direction away from the connector 2, each petal structure 21 closes together, and the connector 2 can enter and exit the holding hole 01. Therefore, when the implanter main body 1 is connected to the femoral stem prosthesis 0, the three petal-like structures 21 are first brought together, the connecting head 2 is inserted into the holding hole 01, and then the operating rod 3 presses the connecting head 2 to make the petal-like structure 21 expand outward, so that the petal-like structure 21 is stuck in the holding hole 01 and cannot escape from the opening of the holding hole 01, thereby realizing the connection between the implanter and the femoral stem prosthesis 0; in addition, when the petal-like structure 21 with a spherical surface is connected in the holding hole 01, even if the implanter shakes during the implantation process, the petal-like structure 21 with a spherical surface can reduce the shaking transmission between the implanter and the femoral stem prosthesis 0, which helps to improve the fixation effect of the bone cement femoral stem prosthesis 0.

[0031] The holding hole 01 on the femoral stem prosthesis 0 is a partially spherical structure, and the center of the holding hole 01 is inside the holding hole 01 .

[0032] In other embodiments, the connector 2 may include two petal-shaped structures 21 or more than three petal-shaped structures 21 , which may be selected according to specific circumstances.

[0033] In this embodiment, three connecting shafts are provided at one end of the implanter body 1 connected to the connector 2 , and the three connecting shafts are hinged to the three petal-shaped structures 21 respectively.

[0034] like Figure 3 As shown, when the three petal-shaped structures 21 of the connector 2 are connected to the implant rod 11 and the femoral stem prosthesis 0 through the connector 2 and the holding hole 01, the implant body 1 can swing within an angle range of 0°-30° relative to the femoral stem prosthesis 0, and the swing direction can be achieved within the entire circumference. During the implantation process, the operator can evade more flexibly, making the operation more convenient.

[0035] like Figure 6As shown, each petal-like structure 21 is provided with a notch at the position where it interacts with the operating rod 3. When the petal-like structures 21 are brought together, the corresponding notches enclose and form a groove 22, which is located on the extension line of the operating rod 3. When the operating rod 3 is to open the petal-like structures 21 outward, the operating rod 3 is pressed down on the groove 22, and the sidewall of the groove 22 is subjected to an outward component of force, that is, the petal-like structure 21 is subjected to an outward component of force. Therefore, the provision of the groove 22 facilitates the operating rod 3 to open the petal-like structure 21.

[0036] In addition, in this embodiment, the spherical connector 2 formed when the petal structures 21 are closed together is a solid structure. Thus, when the operating lever 3 cancels the action of the petal structures 21, the three petal structures 21 automatically move toward the center due to gravity, forming a spherical connector 2.

[0037] In this embodiment, the outer surface of the petal-shaped structure 21 is mirror-finished to facilitate the swinging of the implanter.

[0038] like Figure 4 、 Figure 5 、 Figure 7 and Figure 8 As shown, in this embodiment, a control pin 31 is provided on the operating rod 3, and a through-positioning slot 13 is provided on the side wall of the implant body 1. The control pin 31 passes through the positioning slot 13 and out of the implant body 1. The control pin 31 can be positioned at different positions along the axial direction of the implant body 1 in the positioning slot 13. In this embodiment, the positioning slot 13 includes a first gear slot 131 and a second gear slot 132. The first gear slot 131 and the second gear slot 132 are arranged along the axial direction of the implant body 1, with the first gear slot 131 being located away from the connector 2. The first gear slot 131 and the second gear slot 132 are both elongated and extend along the circumference of the implant body 1. The first gear slot 131 and the second gear slot 132 are connected by a connecting slot 133, which runs parallel to the axial direction of the implant body 1. In this embodiment, the positioning slot 13 is stepped. In other embodiments, it can also be shaped like a "]".

[0039] In addition, the positioning groove 13 can be set to three or more gear grooves according to specific circumstances. The gear grooves are distributed along the axial direction of the implanter body 1. Each gear groove is opened along the circumference of the implanter body 1, and adjacent gear grooves are connected by connecting grooves 133.

[0040] like Figure 5 and Figure 6In this embodiment, a sliding hole 14 is provided along the central axis of the implant body 1, and the operating rod 3 is disposed within the sliding hole 14. The sliding hole 14 is a blind hole extending from one end of the implant body 1 near the connector 2 to the other end. A spring 15 is provided at the blind end of the sliding hole 14, with both ends of the spring 15 respectively abutting the operating rod 3 and the blind end of the sliding hole 14. The spring 15 can press down or pull up the operating rod 3, forcing the control pin 31 to abut against the lower or upper wall of the gear slot, preventing the control pin 31 from moving during the implantation operation, thereby affecting the connection or disconnection between the implant and the femoral stem prosthesis 0 and thus hindering operation. In this embodiment, the sliding hole 14 is a stepped hole.

[0041] In this embodiment, the implanter body 1 includes an implant rod 11 and a handle 12 . One end of the implant rod 11 is connected to the connector 2 , and the other end is connected to the handle 12 .

[0042] When the control pin 31 drives the operating rod 3 to move toward the connector 2, the operating rod 3 presses against the groove 22 of the connector 2 and pushes the petal-like structures 21 to open outward. At this time, the outer contour of the connector 2 reaches its maximum, and the connector 2 is stretched in the holding hole 01 and will not fall out of the holding hole 01; when removing the implanter, the control pin 31 drives the operating rod 3 to move away from the connector 2, the operating rod 3 leaves the petal-like structure 21, and the petal-like structures 21 move inward and close together, so that the connector 2 can fall out of the holding hole 01.

[0043] In addition, it should be understood that although this specification is described in terms of 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.

Claims

1. A femoral stem prosthesis implanter, comprising an implanter body (1); when in use, the implanter body (1) is connected to the femoral stem prosthesis (0), characterized in that: A connector (2) is provided at the lower end of the implant body (1), and the connector (2) includes at least two petal structures (21). When the petal structures (21) are brought together, the connector (2) is in a spherical structure. An operating rod (3) is provided in the axial direction of the implant body (1), and the operating rod (3) can reciprocate along the axial direction of the implant body (1). When the operating rod (3) moves toward the connector (2), each petal structure (21) can be driven to open outward, and the connector (2) cannot pass through the opening of the holding hole (01) on the femoral stem prosthesis (0). When the operating rod (3) moves in a direction away from the connector (2), each petal structure (21) is brought together, and the connector (2) can enter and exit the holding hole (01); when the petal structures (21) are brought together, the interior of the connector (2) is a solid structure; each The position where each of the petal-shaped structures (21) interacts with the operating rod (3) is provided with a notch, and when the petal-shaped structures (21) are brought together, the corresponding notches are combined to form a groove (22), and the groove (22) is located on the extension line of the operating rod (3); a control pin (31) is provided on the operating rod (3), and a through positioning groove (13) is provided on the side wall of the implanter body (1), and the control pin (31) passes through the implanter body (1) from the positioning groove (13), and the control pin (31) can stay at different positions of the positioning groove (13) along the axial direction of the implanter body (1); a sliding hole (14) is provided in the implanter body (1) along the central axis, and the operating rod (3) is provided in the sliding hole (14), and the sliding hole (14) is a blind hole opened from one end of the implanter body (1) close to the connector (2) to the other end.

2. The femoral stem prosthesis implant according to claim 1, characterized in that: The outer surface of the petal-shaped structure (21) is mirror-finished.

3. The femoral stem prosthesis implant according to claim 2, characterized in that: When the operating rod (3) is connected to the femoral stem prosthesis (0) through the connecting head (2) and the holding hole (01), the implant body (1) can swing within an angle range of 0°-30° relative to the femoral stem prosthesis (0).

4. The femoral stem prosthesis implant according to claim 1, characterized in that: The positioning groove (13) includes at least two gear grooves, which are distributed along the axial direction of the implanter body (1), each of which is opened along the circumference of the implanter body (1), and adjacent gear grooves are connected by a connecting groove (133).

5. The femoral stem prosthesis implanter according to claim 1, characterized in that: A spring (15) is provided at the blind end of the sliding hole (14), and two ends of the spring (15) respectively press against the operating rod (3) and the blind end of the sliding hole (14).

6. The femoral stem prosthesis implanter according to claim 1, characterized in that: The implanter body (1) comprises an implant rod (11) and a handle (12); one end of the implant rod (11) is connected to the connector (2), and the other end is connected to the handle (12).

Images