Femoral head medullary expansion tool

Abstract

The invention discloses a femoral head medullary expansion tool, comprising a guide head, an expandable medullary expansion component, a transmission component and a sleeve, wherein the transmission component is used to push the expandable medullary expansion component along the sleeve, and the guide head is connected to the transmission component. The invention is suitable for minimally invasive surgery.

Description

Technical Field

[0001] The invention relates to the field of medical instruments, and in particular to a femoral head medullary expansion tool. Background Art

[0002] Existing medullary expanders, such as existing patents (application number 201822073394.x, application number 201310234892.7, etc.), have medullary expansion components that are fixed blades or drill bits, which are large in size and are not suitable for use in minimally invasive surgery. Summary of the invention

[0003] The present invention aims to provide a tool for expanding the medullary canal of multiple parts such as the femoral head, which is suitable for use in minimally invasive surgery.

[0004] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0005] The femoral head medullary expansion tool disclosed in the present invention comprises a guide head, an expandable medullary expansion component, a transmission component and a sleeve. The transmission component is used to push the expandable medullary expansion component along the sleeve, and the guide head is connected to the transmission component.

[0006] Preferably, the expandable medullary expansion component includes a mounting seat and an expandable metal sheet, the expandable metal sheet is installed on the top of the mounting seat, there are a plurality of expandable metal sheets, and the plurality of expandable metal sheets are arranged at intervals along the circumferential direction, a pit is provided at the bottom of the mounting seat, the transmission assembly includes an advancement screw, a hollow rod, and a cap body, the inner lateral dimension of the upper part of the hollow rod is larger than the lateral dimension of the mounting seat, the guide head is fixedly connected to the upper part of the hollow rod, the advancement screw includes a screw and a nut, the diameter of the screw is smaller than the lateral dimension of the pit, the cap body is threadedly connected to the lower end of the sleeve, the cap body is provided with a through hole, the hollow rod passes through the cap body along the through hole, the part of the hollow rod outside the cap body includes an internal threaded section, and the screw is threadedly matched with the internal threaded section.

[0007] Furthermore, a locking mechanism is provided between the cap body and the sleeve, and the locking mechanism is a buckle.

[0008] Furthermore, a spherical cavity is provided in the through hole, a steering ball is provided in the spherical cavity, and the screw rod passes through the steering ball.

[0009] Furthermore, the upper side wall of the hollow rod is provided with longitudinal notches having the same number as the expandable metal sheets, and the expandable metal sheets pass through the notches after expansion; the cross-section of the hollow rod and the transverse outer contour of the mounting seat are regular polygons with the same number of sides, and the number of the expandable metal sheets is the same as the number of sides of the regular polygon.

[0010] Preferably, the regular polygon is a regular hexagon.

[0011] Preferably, the end of the guide head is arc-shaped.

[0012] Preferably, the guide head is connected to the inner wall of the hollow rod through a connecting rod.

[0013] As a preferred embodiment, the ductility of the expandable metal sheet is greater than that of the iron sheet or the titanium sheet.

[0014] As another preferred embodiment, the expandable metal sheet is a memory alloy, and the sleeve is provided with a water cooling structure, which includes an interlayer located in the side wall of the sleeve, an axial partition is provided in the interlayer, and the axial partition divides the lower part of the interlayer into a water inlet area and a water outlet area, the water inlet is located in the water inlet area, the water outlet is located in the water outlet area, and the top of the interlayer is connected.

[0015] The invention is suitable for use in minimally invasive surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of the present invention

[0017] Figure 2 is a schematic diagram of an expandable medullary expansion component in an expanded state;

[0018] Figure 3 It is a top view of the expandable medullary expansion component and the hollow rod portion. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0020] like Figure 1 , Figure 2 , Figure 3 As shown, the femoral head medullary expansion tool disclosed in the present invention comprises a guide head 7, an expandable medullary expansion component 6, a transmission assembly and a sleeve 2. The transmission assembly is used to push the expandable medullary expansion component 6 along the sleeve 2, and the guide head 7 is connected to the transmission assembly.

[0021] The expandable medullary expansion component 6 includes a mounting seat 5 and an expandable metal sheet 61. The expandable metal sheet 61 is installed on the top of the mounting seat 5. There are a plurality of expandable metal sheets 61, and the plurality of expandable metal sheets 61 are arranged at intervals along the circumferential direction. A pit 51 is provided at the bottom of the mounting seat 5. The transmission assembly includes an advancement screw 4, a hollow rod 3, and a cap body 1. The inner lateral dimension of the upper part of the hollow rod 3 is larger than the lateral dimension of the mounting seat 5. The guide head 7 includes a head 72. The end face 73 of the head 72 is arc-shaped. The bottom surface of the head 72 is connected to the straight rod 71. The straight rod 71 is connected to the inner side wall of the hollow rod 3 through a connecting rod 74. The advancing screw 4 includes a screw 41 and a nut 42. The diameter of the screw 41 is smaller than the transverse dimension of the pit 51. The cap body 1 is provided with a cap body internal thread 11. The lower end of the sleeve 2 is provided with a sleeve external thread 21. The cap body 1 is threadedly connected with the lower end of the sleeve 2. The cap body 1 is provided with a through hole. The hollow rod 3 passes through the cap body 1 along the through hole. The part of the hollow rod 3 located outside the cap body 1 includes an internal thread section 31. The screw 41 is threadedly matched with the internal thread section 31. A spherical cavity is provided in the through hole. A steering ball 13 is provided in the spherical cavity. The screw 41 passes through the steering ball.

[0022] A locking mechanism is provided between the cap body 1 and the sleeve 2, and the locking mechanism is a buckle. Specifically, the buckle comprises a clamping strip 8 movably connected to the sleeve 2, the clamping strip 8 is provided with a protrusion 81, and the cap body 1 is provided with a groove 12, and the protrusion 81 is engaged with the groove 12.

[0023] The upper side wall of the hollow rod 3 is provided with longitudinal notches 32 having the same number as the expandable metal sheets 6, and the expandable metal sheets 6 pass through the notches 32 after expansion; the cross section of the hollow rod 3 and the transverse outer contour of the mounting seat 5 are regular polygons with the same number of sides, and the number of expandable metal sheets 6 is the same as the number of sides of the regular polygon, which is a regular hexagon in this embodiment.

[0024] The expandable metal sheet 6 can be made of a metal with good ductility, and the ductility is greater than that of a traditional iron sheet or a titanium sheet.

[0025] The expandable metal sheet 6 can also be made of memory alloy. When using memory alloy, in order to prevent the expandable metal sheet 6 from recovering when in the sleeve 2, the sleeve 2 is provided with a water cooling structure. The water cooling structure includes an interlayer located in the side wall of the sleeve. An axial partition is provided in the interlayer. The axial partition divides the lower part of the interlayer into a water inlet area and a water outlet area. The water inlet 22 is located in the water inlet area, the water outlet 23 is located in the water outlet area, and the top of the interlayer is connected.

[0026] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A femoral head medullary expansion tool, characterized in that: It includes a guide head, an expandable medullary expansion component, a transmission component and a sleeve, wherein the transmission component is used to push the expandable medullary expansion component along the sleeve, the guide head is connected to the transmission component, and the end of the guide head is arc-shaped; The expandable medullary expansion component includes a mounting seat and an expandable metal sheet, the expandable metal sheet is installed on the top of the mounting seat, there are a plurality of expandable metal sheets, and the plurality of expandable metal sheets are arranged at intervals along the circumferential direction, a pit is provided at the bottom of the mounting seat, the transmission assembly includes an advancement screw, a hollow rod, and a cap body, the inner lateral dimension of the upper part of the hollow rod is larger than the lateral dimension of the mounting seat, the guide head is fixedly connected to the upper part of the hollow rod, the advancement screw includes a screw and a nut, the diameter of the screw is smaller than the lateral dimension of the pit, the cap body is threadedly connected to the lower end of the sleeve, the cap body is provided with a through hole, the hollow rod passes through the cap body along the through hole, the part of the hollow rod outside the cap body includes an internal threaded section, the screw is threadedly matched with the internal threaded section; the guide head is connected to the inner wall of the hollow rod through a connecting rod, a locking mechanism is provided between the cap body and the sleeve, and the locking mechanism is a buckle.

2. The femoral head medullary expansion tool according to claim 1, characterized in that: A spherical cavity is arranged in the through hole, a steering ball is arranged in the spherical cavity, and the screw rod passes through the steering ball.

3. The femoral head medullary expansion tool according to claim 1, characterized in that: The upper side wall of the hollow rod is provided with longitudinal notches with the same number as the expandable metal sheets, and the expandable metal sheets pass through the notches after expansion; the cross section of the hollow rod and the transverse outer contour of the mounting seat are regular polygons with the same number of sides, and the number of the expandable metal sheets is the same as the number of sides of the regular polygon.

4. The femoral head medullary expansion tool according to claim 3, characterized in that: The regular polygon is a regular hexagon.

5. The femoral head medullary expansion tool according to any one of claims 1 to 4, characterized in that: The expandable metal sheet has greater ductility than an iron sheet or a titanium sheet.

6. The femoral head medullary expansion tool according to any one of claims 1 to 4, characterized in that: The expandable metal sheet is a memory alloy, and the sleeve is provided with a water cooling structure, which includes an interlayer located in the side wall of the sleeve, an axial partition is provided in the interlayer, and the axial partition divides the lower part of the interlayer into a water inlet area and a water outlet area, the water inlet is located in the water inlet area, the water outlet is located in the water outlet area, and the top of the interlayer is connected.

Images