TWI652037B - Expandable orthopedic implant - Google Patents

Abstract

An expandable orthopedic implant comprising: a cannula, a shaft, a first expansion member, and a first link. The sleeve has a first opening, a second opening, and an axis passing through the first opening and the second opening. One end of the shaft is disposed in the sleeve, and the other end has a top portion protruding from the outside of the first opening. The first expansion member has a first end pivoted to the sleeve and a second end. The first link has a first proximal end pivotally connected to the top and a first distal end pivotally connected to the second end. When the top portion is away from the first opening along an extending direction of the axis, the first link is pushed to drive the second end away from the axis along the first direction of the vertical axis.

Description

Expandable orthopedic implant

This disclosure is directed to an implantable medical device. In particular, there is an orthopedic implant.

It has been found from clinical observation that the use of orthopedic implants for fixation during fracture treatment often fails due to insufficient bone density of the patient, resulting in a superior cut-out. For example, dynamic hip screw (DHS), Gamma nail, and sliding screw plate, which are commonly used in the treatment of intertrochanteric fractures of the femur, are used as examples. However, if the patient's bone density is insufficient, after the hip bone screw is implanted, it is easy to cause the femoral ball head to collapse and collapse, thereby causing the screw to penetrate the femoral ball head upward, which may cause failure, destruction and loosening of the implant. problem.

Therefore, there is a need to provide an advanced expandable orthopedic implant to solve the problems faced by conventional techniques.

An embodiment of the present specification discloses an expandable orthopedic implant comprising: a cannula, a shaft, a first expansion member, and a first link. The sleeve has a first opening and an axis. The shaft is disposed in the sleeve and has a top protruding from the outside of the first opening. The first expansion member has a first end pivoted to the sleeve and a second end. The first link has a first proximal end pivotally connected to the top and a first distal end pivotally connected to the second end. When the top portion is away from the first opening along the extending direction of the axis, the first link is pushed to drive the second end away from the axis along the first direction of the vertical axis.

In accordance with the above embodiments, the present specification is directed to an expandable orthopedic implant comprising a shaft disposed in a sleeve and an expansion member and a linkage. Wherein, one end of the expansion member and the connecting rod are pivotally connected to each other, and the other ends of the connecting rod are respectively pivotally connected to the sleeve and the connecting rod. By pushing the connecting rod to drive the second end of the expanding member away from the axis in the direction of the vertical axis, a latching mechanism is formed which is outwardly expanded by the edge of the sleeve, which can increase the orthopedic implant and the surrounding cancellous bone The area and stability of the contact prevents the orthopedic implant from further rotating, protruding or loosening inside the bone, which greatly reduces the risk of osteotomy.

100, 200, 300, 400, 500, 600, 700, 700A, 700B, 700C, 700D, 800‧‧‧ Expanded orthopedic implants

101‧‧‧ casing

101a‧‧‧first opening

101b‧‧‧ second opening

101c‧‧‧Axis

101d‧‧‧ casing wall

101e, 102d, 401g‧‧‧ spiral projections

101f‧‧‧First connection location

101g, 402d‧‧‧ spiral groove

The first part of the 101M‧‧‧ casing

The second part of the 101N‧‧‧ casing

102‧‧‧ shaft

102a‧‧‧Top of the shaft

102b‧‧‧The end of the shaft

102c‧‧‧second connection position

102e‧‧‧Long through hole

The third part of the 102M‧‧‧ shaft

The fourth part of the 102N‧‧‧ shaft

103, 203, 303, 803a‧‧‧ first expansion

103a, 203a‧‧‧ first end

103b, 203b, 303b, 403b‧‧‧ second end

103c, 203c‧‧‧ first arm

104, 204, 304‧‧‧ first link

104a, 304a‧‧‧ first proximal end

104b, 204b, 304b‧‧‧ first remote

104c, 304c‧‧‧second arm

105‧‧‧First pivot

106‧‧‧Second pivot

108‧‧‧Anti-rotation design

108a‧‧‧ protruding card

108b‧‧‧Stop platform

109‧‧‧Conical plug

203P‧‧‧ Body Department

203Q‧‧‧First bend

304P‧‧‧ Rod body

304Q‧‧‧second bend

403, 803b‧‧‧ second expansion

403a‧‧‧ third end

403b‧‧‧ fourth end

404‧‧‧second link

404b‧‧‧second far end

603, 803c‧‧‧ third expansion

604‧‧‧third link

603a‧‧‧ fifth end

603b‧‧‧ sixth end

614‧‧‧through holes

R1, r2‧‧‧ inner diameter of the casing wall

R‧‧‧Diameter of the first opening

H1, H2‧‧‧ distance

D‧‧‧Axis extending direction

P‧‧‧Preset distance

L1‧‧‧ first direction

L2‧‧‧ second direction

L3‧‧‧ third direction

K‧‧‧ outer diameter of the casing

S‧‧‧Distance of the first distal end to the cannula axis

θ 1, θ 2, θ 5, θ 61, θ 62, θ 63‧‧‧ angle

In order to better understand the above and other aspects of the present specification, the following specific embodiments are described in detail below with reference to the accompanying drawings: FIG. 1A is an expandable orthopedic implant according to an embodiment of the present specification. A cross-sectional view of the structure before the expansion of the object; FIG. 1B is a cross-sectional enlarged view of the partial structure of the expandable orthopedic implant before expansion according to FIG. 1A; 1C is a perspective view of the structure of the expandable orthopedic implant after expansion according to FIG. 1A; FIG. 2A is a structure of the expandable orthopedic implant before expansion according to another embodiment of the present specification; 1B is a perspective view of the structure of the expandable orthopedic implant after expansion according to FIG. 2A; FIG. 3A is a view of the expandable orthopedic implant before expansion according to still another embodiment of the present specification. 3B is a perspective view of the structure of the expandable orthopedic implant after expansion according to FIG. 3A; FIG. 4A is an expandable orthopedic implant according to still another embodiment of the present specification. Sectional view of the structure before expansion; Figure 4B is a cross-sectional enlarged view of the expandable orthopedic implant prior to expansion according to Fig. 4A; and Fig. 4C is an expandable orthopedic implant expansion according to Fig. 4A FIG. 5 is a perspective view of the structure of the expandable orthopedic implant after expansion according to an embodiment of the present specification; FIG. 6A is illustrated according to an embodiment of the present specification. Expansion of the structure before the expansion of orthopedic implants FIG; architecture of FIG. 6B is a perspective view of the expansion of orthopedic implants in accordance with Figure 6A shows the expandable; 7A to 7E are plan views showing the structure of different expandable orthopedic implants according to different embodiments of the present specification; FIG. 8 is a portion of an expandable orthopedic implant according to an embodiment of the present specification; A perspective view of the structure; and FIG. 9 is a schematic view showing the structure of the hip screw including the expandable orthopedic implant illustrated in FIGS. 6A to 6B after implantation into the hip bone of the patient.

The present specification provides an expandable orthopedic implant that increases the area and stability of contact between the orthopedic implant and the surrounding cancellous bone, and greatly reduces the risk of osteotomy. The above-described embodiments and other objects, features and advantages of the present invention will become more apparent from the claims.

However, it must be noted that these specific embodiments and methods are not intended to limit the invention. The invention may be practiced with other features, elements, methods and parameters. The preferred embodiments are merely illustrative of the technical features of the present invention and are not intended to limit the scope of the invention. Equivalent modifications and variations will be made without departing from the spirit and scope of the invention. In the different embodiments and the drawings, the same or similar elements will be denoted by the same element symbols.

1A to 1C, FIG. 1A is a cross-sectional view showing the structure of the expandable orthopedic implant 100 before expansion according to an embodiment of the present specification. Figure 1B A cross-sectional enlarged view of a portion of the expandable orthopedic implant 100 prior to expansion of the expandable orthopedic implant 100 is shown in FIG. 1 (for clarity, FIG. 1B does not depict the expander 103 and the first link 104). 1C is a perspective view of the structure of the expandable orthopedic implant 100 as shown in FIG. 1A after expansion. The expandable orthopedic implant 100 includes at least one cannula 101, a shaft 102, a first expansion member 103, and a first link 104.

The sleeve 101 may be a tubular housing having a first opening 101a and a second opening 101b and a shaft center 101c extending through the first opening 101a and the second opening 101b of the tubular housing, respectively. In some embodiments of the present specification, the sleeve 101 wall 101d is located in a section on the XY plane and may have a polygonal pattern such as a triangle, a square, a hexagon, etc., a circle, an ellipse, a regular arc. Irregular shape. In the present embodiment, the section of the sleeve 101 on the X-Y plane may be circular. The first opening 101a and the second opening 101b define a circular opening by the inner edge of the tube 101 wall 101d. The axis 101c penetrates the center of the first opening 101a and the second opening 101b.

The inner diameter of the tube 101 wall 101d may have at least two dimensions. For example, in the present embodiment, the sleeve 101 includes a first portion 101M and a second portion 101N. The first portion 101M is calculated from the first opening 101a and extends a distance H1 up to the first connection position 101f; the inner diameter r1 of the tube wall 101d of the sleeve 101 is substantially equal to the diameter R of the first opening 101a. The second portion 101N is calculated from the first connection position 101f to the second opening 101b; the inner diameter r2 of the tube 101 wall 101d is substantially larger than the diameter R of the first opening 101a.

In addition, in some embodiments of the present specification, the outer side of the tube wall 101d of the cannula 101 may further include a spiral protrusion 101e surrounding the axis 101c for enhancing the bone or tissue surrounding the cannula 101 and the implanted site. Friction. The tube 101 wall 101d is calculated from the first opening 101a to the inner side of the first connection position 101f, and may further include a spiral groove 101g recessed inside the tube 101 wall 101d.

The shaft 102 is disposed in the sleeve 101 and has a top portion 102a and a tail end 102b. In some embodiments of the present specification, the shaft 102 is a solid strip-shaped long rod, and the tail end 102b passes through the first opening 101a of the sleeve 101 and is sleeved in the sleeve 101. The top portion 102a is then exposed to the outside of the first opening 101a. In the present embodiment, the shaft 102 is a cylindrical long rod, the top portion 102a is a solid cylindrical hub, and the diameter of the cylindrical hub (top portion 102a) is substantially larger than the cylindrical long rod (shaft) 102) diameter. It should be noted that in order to clearly depict the connection relationship between the shaft 102 and other components, the complete structure of the hub is not shown in FIGS. 1A to 1C. Any pivotal structure that can be used for the shaft 102 and other components does not depart from the spirit of the hub described herein.

The size of the shaft 102 can vary depending on the inner diameters r1 and r2 of the tube wall 101d of the sleeve 101. For example, in the present embodiment, the shaft 102 includes a third portion 102M and a fourth portion 102N. The third portion 102M is calculated from the top portion 102a and extends a distance H2 up to the second connection position 102c; its diameter r3 is substantially less than or equal to the inner diameter r1 of the tube 101 wall 101d. The fourth portion 102N extends from the second attachment location 102c to the trailing end 102b, the diameter r4 of which is substantially less than or equal to the inner diameter r2 of the tube wall 101d of the sleeve 101, and substantially greater than or equal to the inner diameter r1 of the tube wall 101d of the sleeve 101. The distance H2 is substantially greater than the distance H1.

In some embodiments of the present specification, the surface of the third portion 102M of the shaft 102 may further include a spiral projection 102d which is mutually opposite to the spiral groove 101g inside the tube wall 101d of the first portion 101M of the sleeve 101. Screwing. When the spiral projection 102d of the shaft 102 rotates relative to the spiral groove 101g of the sleeve 101, the top portion 102a of the shaft 102 can be driven away from the first opening 101a along the extending direction D of the shaft 101c. When the spiral projection 102d of the shaft 102 rotates in the opposite direction with respect to the spiral groove 101g of the sleeve 101, the top portion 102a of the shaft 102 can be brought closer to the first opening 101a along the extending direction D of the shaft 101c.

In some embodiments of the present specification, an anti-rotation design 108 may be further included between the fourth portion 102N of the shaft 102 and the second portion 101N of the sleeve 101. Wherein, the anti-rotation design 108 can be a cassette design formed to match the inner diameter of the tube wall 101d of the sleeve 101. For example, in the present embodiment, a protruding latch 108a can be disposed on the second connecting position 102c of the fourth portion 102N of the shaft 102 by the maximum extension distance P preset by the top portion 102a of the actuating shaft 102. And a stop platform 108b is provided through the first connection position 101f provided at the second portion 101N of the sleeve 101. In other words, the preset maximum extension distance P of the top portion 102a is substantially equal to the difference between the distance H2 and the distance H1 (ie, P = H2 - H1).

When the distance of the top portion 102a of the shaft 102 away from the first opening 101a substantially exceeds a predetermined distance P (ie, the distance between the top portion 102a of the shaft 102 and the protruding tab 108a), the first connection is located in the sleeve 101. The stop platform 108b of the position 101f and the projecting latch 108a at the second connection position 102c of the shaft 102 are engaged with each other to prevent the shaft 102 from rotating further away from the first opening 101a. its The negative tolerance range (draft angle) between the second portion 101N of the sleeve 101 and the fourth portion 102N of the shaft 102 is substantially between 0.1 and 2 degrees.

In some embodiments of the present specification, a bottom anti-rotation design may also be included, located at the trailing end 102b of the shaft 102. For example, in the present embodiment, the bottom anti-rotation design can be a tapered plug 109. The tapered plug member 109 is inserted into the second portion 101N of the sleeve 101 and abuts against the trailing end 102b of the shaft 102. By the negative tolerance design, a tight fixation between the side wall of the tapered plug 109 and the second portion 101N of the sleeve 101 is created. It is further prevented that the shaft 102 is retracted backward due to the reverse rotation.

In some embodiments of the present specification, the shaft 102 can also be a hollow tubular structure. For example, in the present embodiment, the shaft 102 has a long through hole 102e that passes through the top portion 102a to the trailing end 102b. When the expandable orthopedic implant 100 is implanted in an affected part, such as a femoral head, a biocompatible injectable filler, such as cement or other suitable substance, can be passed through the long through hole 102e. Filled into the femoral head to promote bone regeneration.

The first expansion member 103 has a first end 103a and a second end 103b. The first end 103a is pivotally connected to the sleeve 101 by the first pivot 105; the second end 103b is pivotally connected to the first link 104. In some embodiments of the present specification, the first expansion member 103 can be a plate-like structure, a rod-like structure, a vertebral structure, or any combination of the above. For example, in the present embodiment, the first expansion member 103 may be a rod-like structure. And the body of the rod-like structure has a first force arm 103c that is perpendicular to the first pivot 105. First force arm 103c The angle θ 1 between the shaft 101c and the shaft 101c of the sleeve 101 varies depending on the extent to which the first expansion member 103 is rotated about the first pivot 105. In the present embodiment, the magnitude of the included angle θ 1 is substantially between 0° and 70°.

The first link 104 has a first proximal end 104a and a first distal end 104b. The first proximal end 104a is pivotally connected to the top portion 102a of the shaft 102 by a second pivot 106; the first link 104 has a second force arm 104c perpendicular to the second pivot 106; and the first expansion member 103 The second end 103b and the first distal end 104b of the first link 104 are pivotally connected to the intersection 107 of the first force arm 103c and the second force arm 104c. The angle θ 2 between the shaft 102 and the second force arm 104c of the first link 104 varies with the extent to which the first link 104 rotates about the second pivot 106. In the present embodiment, the magnitude of the included angle θ 2 is substantially between 175° and 90°.

When the shaft 102 is rotated in the forward direction, the top portion 102a of the shaft 102 is moved away from the first opening 101a along the extending direction D of the shaft 101c, the first connecting rod 104 is pushed to drive the second end 103b of the first expanding member 103, The first direction L1 along the vertical axis 101c is away from the axis 101c of the sleeve 101. At this time, the second end 103b of the first expansion member 103 and the first distal end 104b of the first link 104 are radially outwardly expanded about the axis 101c of the sleeve 101. In contrast, when the shaft 102 is reversely rotated to bring the top portion 102a of the shaft 102 closer to the first opening 101a along the extending direction D of the shaft 101c, the first link 104 is pulled to drive the second portion of the first expansion member 103. The end 103b is reversely adjacent to the axis 101c of the sleeve 101 along the first direction L1 of the vertical axis 101c. At this time, the second end 103b of the first expansion member 103 and the first distal end 104b of the first link 104 are centered radially about the axis 101c of the sleeve 101.

In some embodiments of the present specification, when the first expansion member 103 and the first link 102 are fully collapsed, the first expansion member 103 and the first link 104 may be completely within the outer diameter K of the sleeve 101. When the first expansion member 103 and the first link 104 are outwardly expanded to the maximum, the second end 103b of the first expansion member 103 (the first distal end 104b pivotally connected to the first link 104) may extend beyond the sleeve 101. Outside the outer diameter K range. In some embodiments of the present specification, the second end 103b of the first expansion member 103 (the first distal end 104b pivotally connected to the first link 104) is at a distance S from the axis 101c of the sleeve 101, and the sleeve 101 The outer diameter K ratio (S/K) is substantially between 0.1 and 3.5.

For example, in the present embodiment, when the first expansion member 103 and the first link 10 are completely closed, the distance S from the second end 103b of the first expansion member 103 to the axis 101c of the sleeve 101 may be outside the sleeve 101. 0.6 times the diameter K. When the first expansion member 103 and the first link 104 are outwardly expanded to the maximum, the distance S from the second end 103b of the first expansion member 103 to the axis 101c of the sleeve 101 may be 3 of the outer diameter K of the sleeve 101. Times. In other embodiments, the degree of expansion of the first expansion member 103 can be based on the length of the first expansion member 103 and the first link 104, and the angle between the two and the sleeve 101 and the shaft 102. Adjustment.

However, in some embodiments of the present specification, the manner in which the first link 104 and the first extender 103 are coupled is not limited thereto. Please refer to Figures 2A and 2B. 2A is a cross-sectional view of the expandable orthopedic implant 200 prior to expansion, in accordance with another embodiment of the present specification. 2B is a perspective view of the structure of the expandable orthopedic implant 200 after expansion according to FIG. 2A. Among them, expandable orthopedic implant 200 The structure is substantially similar to the expandable orthopedic implant 100 illustrated in FIGS. 1A-1C, except that the shape of the first expander 203 of the expandable orthopedic implant 200 is different.

In the present embodiment, the first expansion member 203 includes a body portion 203P and a first bending portion 203Q that are connected to each other. The body portion 203P has a first force arm 203c perpendicular to the first pivot 105; the first end 203a is located on the body portion 203P, is pivotally connected to the sleeve 101 by the first pivot 105; and the second end 203b is located at the second The curved portion 203Q is located away from the first force arm 203c. The second end 203b of the first expansion member 203 and the first distal end 204b of the first link 204 when the first extension member 203 and the first link 204 are fully collapsed, as compared to the expandable orthopedic implant 100 Will be closer to the sleeve 101 axis 101c. Therefore, the radial area of the expandable orthopedic implant 200 when folded can be saved to facilitate surgical implantation.

It should be noted that the appearance of the first curved portion 203Q of the first expansion member 203 is not limited to an arc shape. Any of the bent structures that can deflect the second end 203b of the first expansion member 203 from the first force arm 203c does not depart from the spirit of the present specification.

Please refer to Figures 3A and 3B. 3A is a cross-sectional view of the expandable orthopedic implant 300 prior to expansion, in accordance with yet another embodiment of the present specification. Figure 3B is a perspective view of the structure of the expandable orthopedic implant 300 after expansion according to Figure 3A. Wherein, the structure of the expandable orthopedic implant 300 is substantially similar to the expandable orthopedic implant 100 illustrated in FIGS. 1A-1C, except for the shape of the first link 304 of the expandable orthopedic implant 300. It is different.

In the present embodiment, the first link 304 includes a shaft portion 304P and a second curved portion 304Q that are connected to each other. The shaft portion 304P has a second force arm 304c perpendicular to the second pivot 106; the first proximal end 304a is located on the shaft portion 304P by The two pivots 106 and the top portion 102a of the shaft 102; the first distal end 304b is located on the second curved portion 304Q, away from the second force arm 304c, and pivotally connected to the second end 303b of the first expansion member 303. The second end 303b of the first expansion member 303 and the first distal end 304b of the first link 304 when the first extension member 303 and the first link 304 are fully expanded, as compared to the expandable orthopedic implant 100 Will be farther away from the sleeve 101 axis 101c. Therefore, when the top portion 102a of the shaft 102 is moved upward by the same distance, the radial expansion area of the first expansion member 303 and the first link 304 can be increased.

It should be noted that the shape of the second curved portion 304Q of the first link 304 is not limited to an arc shape. Any of the bent structures that can bias the first distal end 304b of the first link 304 away from the second force arm 304c does not depart from the spirit of the present specification.

Please refer to Figures 4A to 4C. 4A is a cross-sectional view of the expandable orthopedic implant 400 prior to expansion in accordance with yet another embodiment of the present specification. 4B is a partial cross-sectional enlarged view of the expandable orthopedic implant 400 before expansion according to FIG. 4A (for clarity of illustration, FIG. 4B does not show the second expansion member 403 and the second link. 404). Figure 4C is a perspective view of the structure of the expandable orthopedic implant 400 after expansion according to Figure 4A.

The structure of the expandable orthopedic implant 400 is substantially similar to the expandable orthopedic implant 100 illustrated in FIGS. 1A-1C. The difference is that the expandable orthopedic implant 400 further includes a second expansion member 403 and a second link 404. The second extension 403 has a third end 403a and a fourth end 403b; the third end 403a is pivotally connected to the sleeve 101; the second link 404 is pivotally connected to the sleeve A second proximal end 404a of the top portion 102a of the shaft 102 and a second distal end 404b pivotally coupled to the fourth end 403a.

In addition, the surface of the third portion 102M of the shaft 102 of the expandable orthopedic implant 400 may include a helical groove 402d that is mutually opposite to the helical projection 401g on the inner side of the tube wall 101d of the first portion 101M of the sleeve 101. Screwing. When the shaft 102 is rotated in the forward direction to move the top portion 102a away from the first opening 101a along the extending direction D of the axis 101c, the second link 404 is pushed to drive the fourth end 403b of the second expansion member 403 along the vertical axis. The second direction L2 of 101c is away from the axis 101c of the sleeve 101.

In the present embodiment, both the first direction L1 and the second direction L2 may be parallel to each other but in opposite directions. In other words, both the first direction L1 and the second direction L2 sandwich a substantially flat angle of 180°. However, in some embodiments of the present specification, the expansion direction of the second extension member 403 and the second link 404 may be such that the first direction L1 and the second direction L2 are sandwiched according to the bone density of the implant site and the stress required. A non-flat angle θ 5 of less than 180° (as shown in Figure 5 of the expandable orthopedic implant 500).

Although, in the embodiments of FIGS. 4A to 4C and 5, the size (e.g., length and/or width) of the first expansion member 103 is the same as that of the second expansion member 403; the size of the first link 104 and The second link 404 is the same. However, in other embodiments, the first expansion member 103, the second expansion member 403, the first link 104, and the second link 404 may be changed according to the bone density of the implant site and the stress required. The size is such that the first expansion member 103 is different in size from the second expansion member 403 or that the first link 104 is different in size from the second link 404.

Referring to FIGS. 6A and 6B, FIG. 6A is a perspective view of the structure of the expandable orthopedic implant 600 after expansion according to an embodiment of the present specification. Figure 6B is a perspective view of the structure of the expandable orthopedic implant 600 after expansion according to Figure 6A. The structure of the expandable orthopedic implant 600 is generally similar to the expandable orthopedic implant 400 depicted in FIG. 4C. The difference is that the expandable orthopedic implant 600 further includes a third expansion member 603 and a third link 604.

Wherein, the third expansion member 603 has a fifth end 603a and a sixth end 603b. The fifth end 603a is pivotally connected to the sleeve 101; the third link 604a has a third proximal end 604a pivotally connected to the top portion 102a of the shaft 102 and a third distal end 604b pivotally connected to the sixth end 603b. When the shaft 102 is rotated in the forward direction to move the top portion 102a away from the first opening 101a along the extending direction D of the axis 101c, the second link 604 is pushed to drive the sixth end 603b of the second expansion member 603 along the vertical axis. The third direction L3 of 101c is away from the axis 101c of the sleeve 101.

In the present embodiment, the angle θ 61 formed by the first direction L1 and the second direction L2, the angle θ 62 formed by the second direction L2 and the third direction L3, and the first direction L1 and the third direction L3 are formed. The included angle θ 63 constitutes a circumferential angle (360°). The angles θ 61, θ 62 and θ 63 are equal (ie 120° respectively). However, as described above, the expansion direction of the third expansion member 603 and the third link 604 may be different depending on the bone density at the implantation site and the stress required, and the angles θ 61, θ 62 and θ 63 may be different. s arrangement. For example, in this specification In his embodiment, the angles θ 61, θ 62 and θ 63 may not be equal to each other or only two of them may be equal.

In addition, in order to increase the stress carrying capacity of the expandable orthopedic implant 600, in the present embodiment, the first expanding member 103, the second expanding member 403, and the third expanding member 603 may be an arc-shaped plate-like structure. The wall 101d of the sleeve 101 can be substantially parallel when folded. The first expansion member 103, the second expansion member 403, and the third expansion member 603 further include a spiral protrusion 613 protruding from the first expansion member 103, the second expansion member 403, and the third expansion member 603, respectively. The expansion member is away from the surface of the shaft 101c of the sleeve 101, and shares the axis 101c with the spiral projection 101e on the outer side of the tube wall 101d of the sleeve 101.

In some embodiments of the present specification, the expandable orthopedic implant 600 can be fabricated using a biodegradable material, such as a biodegradable composition based on magnesium, iron, manganese, or the alloy described above. To increase the rate of decomposition of the expandable orthopedic implant 600 in the organism. At least one through hole 614 may be formed in at least one of the sleeve 101, the shaft 102, the first expansion member 103, the second expansion member 403, and the third expansion member 603. In this embodiment, a plurality of through holes 614 may be formed in the sleeve 101 to promote the rate of biodegradation of the block.

It is worth noting that the number of expansion members and connecting rods of the expandable orthopedic implant 600 is not limited thereto. More expansion members and connecting rods may be included within the scope of the accommodation space permit. For example, please refer to FIGS. 7A-7E, and FIGS. 7A-7E illustrate top views of different expandable orthopedic implants 700, 700A, 700B, 700C, and 700D, respectively, in accordance with various embodiments of the present specification. among them, The structures of the expandable orthopedic implants 700, 700A, 700B, 700C, and 700D may have four, five, six, seven, and eight sets of cassette structures consisting of an expansion member 703 and a link 704, respectively.

Additionally, the expandable members and links of the expandable orthopedic implant 600 can have other possible shapes. For example, please refer to FIG. 8 , which is a partial structural perspective view of an expandable orthopedic implant 800 in accordance with an embodiment of the present specification. Therein, the structure of the expandable orthopedic implant 800 is substantially similar to the expandable orthopedic implant 600 depicted in FIGS. 6A and 6B. The difference is that the first expansion member 803a, the second expansion member 803b, and the third expansion member 803c of the expandable orthopedic implant 800 are all flat plate structures.

Please refer to FIG. 9. FIG. 9 is a schematic view showing the structure of the hip bone screw including the expandable orthopedic implant 600 shown in FIGS. 6A to 6B after implantation into the hip bone of the patient. After the hip bone screw including the expandable orthopedic implant 600 is implanted into a predetermined position of the patient's hip bone, the first expansion member 103 and the second expansion member 403 can be rotated by the shaft 91 by adjusting the tool 91. And the third expansion member 603 is radially outwardly expanded with the axial center 101c of the cannula 101 as a center, thereby increasing the area and stability of the contact between the hip bone screw and the cancellous bone around the femoral ball head, and preventing the hip bone screw from being in the femoral ball. Further rotation, penetration or loosening inside the head can significantly reduce the risk of osteotomy during hip fixation.

However, the scope of application of the expandable orthopedic implant provided by the present specification is not limited thereto. The expandable orthopedic implant provided by the above embodiments can still be applied to other orthopedic operations to fix and connect the affected bones. Fill, support, stretch or provide other possible physical or physiological functions. For example, in some embodiments of the present specification, the expandable orthopedic implant described above can be applied to an expandable ligament bone nail, an expandable spinal vertebral body cage, and an expandable pedicle screw (pedicle). Screw) or other suitable orthopedic implant.

In accordance with the above embodiments, the present specification is directed to an expandable orthopedic implant comprising a shaft disposed in a sleeve and an expansion member and a linkage. Wherein, one end of the expansion member and the connecting rod are pivotally connected to each other, and the other ends of the connecting rod are respectively pivotally connected to the sleeve and the connecting rod. By pushing the connecting rod to drive the second end of the expanding member away from the axis in the direction of the vertical axis, a latching mechanism is formed which is outwardly expanded by the edge of the sleeve, which can increase the orthopedic implant and the surrounding cancellous bone The area and stability of the contact prevents the orthopedic implant from further rotating, protruding or loosening inside the bone, which greatly reduces the risk of osteotomy.

While the invention has been described above by way of a preferred embodiment, it is not intended to limit the invention, and it is to be understood by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

Claims (19)

An expandable orthopedic implant comprising: a sleeve having a first opening, a second opening, and an axis passing through the first opening and the second opening; a shaft having one end penetrating the sleeve The first end of the tube has a top portion protruding from the outer side of the first opening; a first expanding member having a first end and a second end, the first end being pivotally connected to the sleeve; and a first a connecting rod having a first proximal end pivotally connected to the top and a first distal end pivotally connected to the second end; when the top is away from an extension of the axis The first opening drives the first link to drive the second end away from the axis along a first direction perpendicular to the axis; the sleeve includes a first portion and a second portion connected to each other The first portion has a first inner diameter substantially the same as a diameter of the first opening; the second portion has a second inner diameter greater than the diameter; the shaft includes a third portion interconnected and a fourth portion; the third portion having substantially less than or equal to the first inner diameter A first diameter, and is disposed through the first portion within; the fourth portion has a second inner diameter smaller than the equal and greater than a second diameter of the first inner diameter. The expandable orthopedic implant of claim 1, wherein the shaft and the first link have an included angle substantially between 175° and 90°. The expandable orthopedic implant of claim 1, wherein the first end is pivotally connected to the sleeve by a first pivot, the first expansion member having a first pivot a first force arm, and the axis and the first force arm have an included angle substantially between 0° and 70°. The expandable orthopedic implant of claim 3, wherein the first link is pivotally coupled to the top by a second pivot having a second pivot perpendicular to the second pivot a second force arm; and the second end and the first distal end are pivotally connected to an intersection of the first force arm and the second force arm. The expandable orthopedic implant of claim 1, wherein the first expansion member comprises a body portion and a first bending portion connected to each other; the first end is located on the body portion, by The first pivot is pivotally connected to the sleeve; the body portion has a first force arm perpendicular to the first pivot; and the second end is located on the first bend and away from the first force arm. The expandable orthopedic implant of claim 1, wherein the first link comprises a body portion connected to each other and a second bending portion, the first proximal end being located on the body portion. And with a second pivot and the top The portion is pivotally connected, and the rod body has a second force arm perpendicular to the second pivot; the first distal end is located on the second curved portion and away from the second force arm. The expandable orthopedic implant of claim 1, wherein the sleeve has a plurality of through holes located on at least one of the tube walls defining the first opening and the second opening. The expandable orthopedic implant of claim 1, wherein the first expansion member has an arcuate plate-like structure substantially parallel to the sleeve for defining at least one of the first opening and the second opening Tube wall. The expandable orthopedic implant of claim 8, wherein the first expansion member has a first spiral protrusion located on a surface of the first expansion member away from the axis, and surrounding the Axis. The expandable orthopedic implant of claim 9, wherein the sleeve has a second helical projection located outside the tube wall and surrounding the axis. The expandable orthopedic implant of claim 1, further comprising: a third spiral protrusion protruding in the sleeve for defining at least the first opening and the second opening The inside of a wall; and A first spiral groove is recessed on a surface of the shaft and is screwed to the third spiral protrusion. The expandable orthopedic implant of claim 1, further comprising: a second spiral groove recessed in the sleeve for defining at least one tube of the first opening and the second opening An inner side of the wall; and a fourth spiral protrusion protruding from a surface of the shaft and being screwed to the second spiral groove. The expandable orthopedic implant of claim 1, wherein the shaft is a tubular structure having a long through hole therethrough. The expandable orthopedic implant of claim 1, wherein the sleeve has a stop platform at a first connection position of the first portion and the second portion; the shaft has a convex card The crucible is located at the third portion and a second connection position of the fourth portion. The expandable orthopedic implant of claim 1, further comprising a bottom anti-rotation design, plugged into the sleeve and in contact with a tail end of the shaft. The expandable orthopedic implant of claim 1, further comprising: a second expansion member having a third end and a fourth end, the third end being pivotally connected to the sleeve; and a first a second connecting rod having a second proximal end pivotally connected to the top portion and a second distal end pivotally connected to the fourth end; when the top portion is away from the opening along the extending direction, the second connecting rod is pushed The fourth end is driven away from the sleeve along a second direction perpendicular to the axis. The expandable orthopedic implant of claim 16, wherein the first direction and the second direction are at a flat angle or a non-flat angle. The expandable orthopedic implant of claim 16, further comprising: a third expansion member having a fifth end and a sixth end, the fifth end being pivotally connected to the sleeve; and a first a third connecting rod having a third proximal end pivotally connected to the top portion and a third distal end pivotally connected to the sixth end; when the top portion is away from the opening along the extending direction, the third connecting rod is pushed The sixth end is driven away from the sleeve along a third direction perpendicular to the axis. The expandable orthopedic implant of claim 18, wherein the first direction and the second direction are sandwiched by a first angle; the second direction and the third direction are sandwiched by a second angle; and the An angle is equal to or greater than the second angle.