CN217090869U

CN217090869U - Femoral replacement device

Info

Publication number: CN217090869U
Application number: CN202220027030.1U
Authority: CN
Inventors: 洪琦; 洪紫荊; 李芳�
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-01-07
Filing date: 2022-01-07
Publication date: 2022-08-02
Anticipated expiration: 2032-01-07

Abstract

A femur replacement device comprises a femur head cup (2) and a main nail (3), wherein the outer wall of the main nail (3) is provided with threads, one end of the main nail (3) is provided with a first spiral extending part (6), the other end of the main nail (3) is fixed in the femur head cup (2), the femur replacement device also comprises a group of auxiliary nails (9), the outer wall of the auxiliary nails (9) is provided with threads, the end part of the auxiliary nails (9) is provided with a second spiral extending part, the femur head cup (2) is provided with a group of screw mounting holes, the screw heads of the group of auxiliary nails (9) are positioned in the corresponding screw mounting holes, and the group of auxiliary nails (9) are uniformly distributed in an annular manner by taking the main nail (3) as the center; the advantages are that: 1. the femoral head and the femoral neck do not need to be cut off, the operation trauma is reduced, and the common femoral head can be used for replacement even if the patient fails. 2. Greatly improves the stability of the femoral head and has little influence on the function of the femoral head. 3. More accords with the biomechanical principle of human standing.

Description

Femoral replacement device

Technical Field

The utility model relates to the field of medical equipment, concretely relates to thighbone replacement device.

Background

Currently, the existing femoral head replacer (humeral head replacer) needs to cut the femoral head (humeral head) and the femoral neck has great damage to the head, and a femoral head fixing device which does not need to cut the femoral head and the femoral neck is lacked.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to provide a femoral replacement device, which overcomes the above-mentioned disadvantages.

The utility model comprises a femur head cup and a main nail,

the outer wall of the main nail is provided with threads, one end of the main nail is provided with a first spiral extending part, and the other end of the main nail is fixed in the femoral head cup.

The outer wall of the auxiliary nail is provided with threads, the end part of the auxiliary nail is provided with a second spiral extending part, the femoral head cup is provided with a group of screw mounting holes, the head of the screw of the group of auxiliary nails is positioned in the corresponding screw mounting hole, and the group of auxiliary nails are uniformly distributed in a ring shape by taking the main nail as the center.

The femoral head cup is provided with a main nail mounting hole, the main nail is mounted in the main nail mounting hole, the main nail is a hollow nail or a solid nail, the limiting spring is positioned in the femoral neck, and the main nail is positioned in a spiral gap of the limiting spring.

The intramedullary nail is also provided with a intramedullary nail, the bottom of the intramedullary nail is provided with a spiral fixing part, the upper part of the intramedullary nail is provided with a nail penetrating hole, the outer wall of the intramedullary nail is provided with a thread, the rotating direction of the thread is the same as that of the spiral fixing part, a main nail is inserted into the nail penetrating hole, and a limiting spring is sleeved on the upper part of the intramedullary nail.

The needle is characterized by also comprising a gland, wherein the outer wall of the top of the intramedullary needle is provided with gland threads, the gland threads are arranged on the gland threads at the top of the intramedullary needle, and the gland is tightly pressed at the top of the limiting spring.

The nail penetration holes are inclined holes, the included angle between the central line of the main nail and the central line of the intramedullary nail is alpha, and the alpha is 40-60 degrees.

The end part of the spiral fixing part is in a needle point shape.

The intramedullary pin is a hollow intramedullary pin, and the top of the spiral fixing part is fixedly arranged on the bottom end surface of the intramedullary pin.

The cross sections of the threads of the intramedullary nail, the main nail and the auxiliary nail are V-shaped.

The ends of the first and second helical extensions are cutting edges.

The utility model has the advantages that:

1. the femoral head and the femoral neck do not need to be cut off, the operation trauma is reduced, and the common femoral head can be used for replacement even if the patient fails.

2. Greatly improves the stability of the femoral head and has little influence on the function of the femoral head.

3. More accords with the biomechanical principle of human standing.

Description of the drawings

Fig. 1 is a schematic structural view of the acetabular cup of the invention.

Fig. 2 is a schematic structural view of the acetabular cup and the limiting spring of the invention fixed on the femoral head.

Fig. 3 is a schematic structural view of the intramedullary pin, the acetabular cup and the limiting spring of the present invention being fixed simultaneously.

Fig. 4 is a schematic structural view of the intramedullary pin of the present invention.

Fig. 5 is a schematic structural view of the main nail of the present invention installed in the intramedullary nail.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. In the description of the embodiments of the present invention, it should be noted that, if the terms "upper", "lower", "inside", "outside", etc. are used for indicating the orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention usually place when using, the present invention is only used for convenience of description and simplification of the description, but does not indicate or imply that the devices or elements indicated must have specific orientations, be constructed in specific orientations, and operate, and thus, the present invention should not be construed as being limited. Furthermore, the appearances of the terms "first," "second," and the like in the description of the present invention are only used for distinguishing between the descriptions and are not intended to indicate or imply relative importance. In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in the attached drawings, the utility model comprises a femur head cup 2 and a main nail 3,

the outer wall of the main nail 3 is provided with threads, one end of the main nail 3 is provided with a first spiral extending part 6, and the other end of the main nail 3 is fixed in the femoral head cup 2.

The femoral head cup is characterized by further comprising a group of auxiliary nails 9, threads are arranged on the outer walls of the auxiliary nails 9, second spiral extending portions are arranged at the end portions of the auxiliary nails 9, a group of screw mounting holes are formed in the femoral head cup 2, screw heads of the group of auxiliary nails 9 are located in the corresponding screw mounting holes, and the group of auxiliary nails 9 are uniformly distributed in an annular mode by taking the main nail 3 as a center.

The femoral head cup is characterized by further comprising a limiting spring 7, a main nail mounting hole is formed in the femoral head cup 2, the main nail 3 is mounted in the main nail mounting hole, the main nail 3 is a hollow nail or a solid nail, the limiting spring 7 is located in a femoral neck, and the main nail 3 is located in a spiral gap of the limiting spring 7.

The intramedullary nail is further provided with an intramedullary nail 1, the bottom of the intramedullary nail 1 is provided with a spiral fixing part 4, the upper part of the intramedullary nail 1 is provided with a nail penetrating hole 5, the outer wall of the intramedullary nail 1 is provided with a thread, the rotating direction of the thread is the same as that of the spiral fixing part 4, a main nail 3 is inserted into the nail penetrating hole 5, and a limiting spring 7 is sleeved on the upper part of the intramedullary nail 1.

The intramedullary nail is characterized by further comprising a gland 8, gland threads are arranged on the outer wall of the top of the intramedullary nail 1, the gland 8 is installed on the gland threads on the top of the intramedullary nail 1 in a threaded mode, and the gland 8 is pressed on the top of the limiting spring 7.

The nail penetration holes 5 are inclined holes, the included angle between the central line of the main nail 3 and the central line of the intramedullary nail 1 is alpha, and the alpha is 40-60 degrees. The nail penetrating holes 5 are inclined holes and are obliquely arranged in cooperation with the main nails 3.

The end of the spiral fixing part 4 is needle point shaped. Facilitating the screwing in of the helical anchoring portion 4.

The intramedullary pin 1 is a hollow intramedullary pin, and the top of the spiral fixing part 4 is fixedly arranged on the bottom end surface of the intramedullary pin 1.

The cross sections of the threads of the intramedullary nail 1, the main nail 3 and the auxiliary nail 9 are V-shaped. The V-shaped geometric thread is adopted, and the anti-pulling and pressurizing effects are achieved.

The ends of the first 6 and second helical extensions are cutting edges. Facilitating screwing of the helical extension into the bone.

Example 1: the main nail 3 is screwed in from the femoral head until the femoral head cup 2 covers the femoral head, and the fixing is completed, and the first spiral extending part 6 plays roles of resisting pull-out, resisting tip upwarp and resisting tip sinking.

Example 2: the main nail 3 is screwed in from the femoral head until the femoral head cup 2 covers the femoral head, and the auxiliary nails 9 are screwed in the femoral head along the screw mounting holes on the femoral head cup 2, so that the effect of reinforcing the femoral head cup 2 and preventing the rotation of the femoral head cup 2 is achieved. Both the first 6 and the second helical extensions act against pull-out, tip lift and tip dip.

Example 3: the main nail 3 is screwed in from the femoral head until the femoral head cup 2 covers the femoral head, the limiting spring 7 is screwed in from the femoral plough-shaped socket, the end part of the limiting spring 7 is propped against the outer wall of the main nail 3, the main nail 3 is pressed and fixed, and the main nail 3 is clamped.

Example 4: the limiting spring 7 is screwed in from the plough-shaped nest of the femur, the main nail 3 is screwed in from the femoral head until the femoral head cup 2 covers the femoral head, the main nail 3 is positioned in the spiral gap of the limiting spring 7, the main nail 3 is pressed and fixed through the limiting spring 7 to clamp the main nail 3, and the main nail 3 can be inserted into the guide pin through the main nail 3 when being a hollow nail.

Example 5: a doctor inserts an intramedullary needle 1 into the center of a femoral head by using an intramedullary needle guider, screws a limiting spring 7 from a plough-shaped nest of a femur, the intramedullary needle 1 is positioned in the limiting spring 7, screws a main nail 3 from the femoral head, inserts the main nail 3 into a nail penetration hole 5 until a femoral head cup 2 covers the femoral head, the main nail 3 is positioned in a spiral gap of the limiting spring 7, presses and fixes the main nail 3 through the limiting spring 7, clamps the main nail 3, and screws a group of auxiliary nails 9 into the femoral head along screw mounting holes on the femoral head cup 2, so that the functions of reinforcing the femoral head cup 2 and preventing the femoral head cup 2 from rotating are achieved.

Example 6: a doctor inserts an intramedullary needle 1 into the center of a femoral head by using an intramedullary needle guider, a limiting spring 7 is screwed in from a femoral plough-shaped pit, the intramedullary needle 1 is positioned in the limiting spring 7, a main nail 3 is screwed in from the femoral head, the main nail 3 is inserted into a nail penetration hole 5 until a femoral head cup 2 covers the femoral head, the main nail 3 is positioned in a spiral gap of the limiting spring 7, the main nail 3 is pressed and fixed by the limiting spring 7, the main nail 3 is clamped and pressed on the top of the limiting spring 7 by a pressing cover 8, the limiting spring 7 is prevented from loosening, then a group of auxiliary nails 9 are screwed in the femoral head along screw mounting holes on the femoral head cup 2, and the functions of reinforcing the femoral head cup 2 and preventing the femoral head cup 2 from rotating are achieved.

Hydroxyapatite is plated on the intramedullary pin 1, the main pin 3, the auxiliary pin 9 and the concave surface of the femoral head.

Claims

1. A femoral replacement device, which is characterized by comprising a femoral head cup (2) and a main nail (3),

the outer wall of the main nail (3) is provided with threads, one end of the main nail (3) is provided with a first spiral extending portion (6), the other end of the main nail (3) is fixed in the femoral head cup (2), the auxiliary nail (9) is further provided with a group of auxiliary nails (9), the outer wall of the auxiliary nails (9) is provided with threads, the end portion of the auxiliary nails (9) is provided with a second spiral extending portion, the femoral head cup (2) is provided with a group of screw mounting holes, screw heads of the group of auxiliary nails (9) are located in the corresponding screw mounting holes, and the group of auxiliary nails (9) are uniformly distributed in an annular mode by taking the main nail (3) as the center.

2. A femoral replacement device according to claim 1, further comprising a limiting spring (7), wherein the femoral head cup (2) is provided with a main nail mounting hole, the main nail (3) is mounted in the main nail mounting hole, the main nail (3) is a hollow nail or a solid nail, the limiting spring (7) is positioned in the femoral neck, and the main nail (3) is positioned in the helical gap of the limiting spring (7).

3. The femoral replacement device according to claim 2, characterized in that it further comprises an intramedullary nail (1), the bottom of the intramedullary nail (1) is provided with a spiral fixing part (4), the upper part of the intramedullary nail (1) is provided with a nail penetration hole (5), the outer wall of the intramedullary nail (1) is provided with a thread, the screwing direction of the thread is the same as that of the spiral fixing part (4), the main nail (3) is inserted into the nail penetration hole (5), and the limiting spring (7) is sleeved on the upper part of the intramedullary nail (1).

4. A femoral replacement device according to claim 3, characterized in that it further comprises a gland (8), the outer wall of the top of the intramedullary nail (1) is provided with a gland thread, the gland (8) is mounted on the gland thread of the top of the intramedullary nail (1) in a threaded manner, and the gland (8) is pressed against the top of the limiting spring (7).

5. A femoral replacement device according to claim 4, characterized in that the nail penetration hole (5) is an oblique hole, the angle between the centre line of the main nail (3) and the centre line of the intramedullary nail (1) being α, α being 40-60 °.

6. A femoral replacement device according to claim 4, characterised in that the end of the helical anchoring portion (4) is pointed.

7. A femoral replacement device according to claim 4, characterized in that the intramedullary needle (1) is a hollow intramedullary needle, the top of the helical anchoring portion (4) being fixedly mounted on the bottom end face of the intramedullary needle (1).

8. A femoral replacement device according to claim 4, characterized in that the cross-section of the threads of the intramedullary nail (1), the main nail (3) and the secondary nail (9) is V-shaped.

9. A femoral replacement device according to claim 4, wherein the ends of the first helical extension (6) and the second helical extension are cutting edges.