TWM615345U - Joint fusion assistant device - Google Patents

Abstract

A joint fusion assistant device includes at least one bone nail and a guide pin for adjusting the gap in a joint between two bones. Each bone nail has a tapping thread and a side thread. The tapping thread revolves around a central reference axis to enclose a pin guide hole, and the side thread revolves around the central reference axis to enclose an accommodating chamber. The side thread has at least one side groove, wherein the pin guide hole, the accommodating chamber, and the side groove communicate to form a continuous space inside the bone nail. The guide pin is used to assist the bone nail to be positioned at a predetermined position in the joint, and the guide pin penetrates the pin guide hole to guide the bone nail to the predetermined position.

Description

Joint fusion assist device

The model provides a joint fusion assisting device, in particular a joint fusion assisting device capable of adjusting the gap between two bones in a joint.

In human bones, bone damage is often caused by different reasons. Bone injuries, such as the joints between the sacrum and ilium located in the lower body, are often damaged due to exercise, incorrect posture, fertility, injury, improper force, aging, etc., and often cause inconvenience. Generally, the treatment of joint damage between the sacrum and the iliac bone includes a device that penetrates the sacrum and the iliac bone, and inserts a bone graft to perform a fusion step at the joint.

Referring to Fig. 1, there is shown the technical content provided by US Patent US9974573, in which the device must penetrate the iliac bone and be locked into the sacrum. In order to avoid excessive shear stress when the device is directly tapped through the bone, causing damage to the bone, a hole is drilled in the penetration position in advance to greatly reduce the shear stress of the contact surface between the screw tooth and the bone when the device penetrates the bone. However, in order to be able to fill the bone material in the device, the device must have a considerable outer diameter, which causes the thickness of the bone after drilling to be greatly reduced, which affects the strength of the bone body. In addition, the practice of penetrating bones can easily damage the nerves or blood vessels.

Other prior technologies, such as the devices disclosed in US Patent Nos. US9526548 and US9186155, both penetrate the sacrum and lock into the iliac bone, or penetrate the iliac bone and lock into the sacrum, all of which have the same skeletal body strength concerns.

Therefore, a device implantation technology that can take into account convenient operation, convenient operation, and the strength of the bone body is very important.

A joint fusion assisting device The joint fusion assisting device includes at least one device for adjusting the gap between two bones in a joint. Each device has a push-pull slotted thread and a side outer thread. The push-pull slotted thread has the function of self-tapping and drilling threads on the joint. The side outer thread is used to separate the two bone structures to create a gap. For filling in a bony material. The push-pull slotted thread and the lateral external thread surround the outer surface of the device along a reference central axis. The device has an accommodating cavity, and the external thread on the outer surface of the device has at least one lateral slot. The accommodating cavity and the side slot are connected to the inside of the device to form a continuous space. The device can further be provided with a guide pin hole on the aforementioned imaginary reference center axis, and by passing a guide pin through the guide pin hole of the device, the device device can be guided to a predetermined position of the device in the joint, by The guide pin penetrates the guide pin hole, and the guide device reaches the predetermined position of the device. The guide pin can be used to position the device to achieve the effect of accurately adjusting and controlling the gap between the two bones.

Detailed descriptions are given below by specific embodiments, so that it will be easier to understand the purpose, technical content, features, and effects of the present invention.

The drawings in the present invention are all schematic, and are mainly intended to show the relationship between the components of each component. As for the shapes and sizes, they are not drawn according to scale.

2, which shows a fusion assisting device according to a joint fusion assisting device 10, the joint fusion assisting device 10 includes at least one fusion assisting device 11 and a guide pin 12 for adjusting the gap between two bones in a joint (Figure Take the sacrum and iliac bones as examples). Among them, the fusion assisting device 10 and the guide pin 11 are substantially cylindrical and rod-shaped structures, respectively. 3, 4 (corresponding to the cross-sectional view of the section line AA of FIG. 3), 5 (corresponding to the cross-sectional view of the section line BB of FIG. 3), the fusion assisting device 11 has a push-pull slotted thread 111 and a side surface The external thread 112, the push-pull slotted thread 111 has the function of performing self-tapping on the joint structure, and the lateral external thread 112 is used to separate the gap between the two bones. The fusion assisting device 11 creates a gap between the two bones. Fill in a bony material (bone material is a known technology and will not be described in detail here). The push-pull slotted thread 111 wraps around a guide pin hole 113 along an imaginary reference central axis CC of the fusion aid 11, and the lateral external thread 112 wraps around an accommodating cavity 114 along the reference central axis CC, and the lateral external thread 112 is provided with a side slot 115 (the range of the dashed line in FIG. 3 ), and the side slot 115 is an opening of the accommodating cavity 114 toward the surface of the side external thread 112. The guide pin hole 113, the accommodating cavity 114, and the side slot 115 communicate in the fusion assisting device 11 to form a continuous space. The guide pin 12 is used to assist in positioning the device 11 at a proper predetermined position of a fusion assisting device in the joint, and the guide pin hole 113 of the fusion assisting device 11 is sleeved outside the guide pin 12, thereby guiding the fusion assisting device 11 to the fusion assisting device. Device predetermined location. The guide pin 12 can accurately position the insertion position of the device 11 to produce the effect of adjusting and controlling the gap between the two bones in a joint.

In one embodiment, in the gap between the two bones and the continuous space of the fusion assisting device 11 (that is, the aforementioned continuous space extends to the gap between the two bones), a bony material can be filled, and the function of this bony material is rapid Assist in the growth of new bones. In the space between the two bones where the fusion assisting device 11 is inserted, the bony material can be used to assist the fusion of the two bones at the joints (Fusion), so that the bearing force is dispersed throughout the joints instead of being concentrated on the fusion assisting device 11 At the same time, the two bones are combined into one bone by fusion, so as to avoid the joints from being loosened and worn out by the force. In one embodiment, after the continuous space is filled with bone material, the bone material overflows from the side groove 115 to the sacrum and ilium (Figure 4 shows the bone material overflows from the side groove 115). In this way, when long bones are started after filling the bone material, the fusion assisting device 11 can be used to determine the space between the two bones, so that the long bone space between them can be kept stable.

In one embodiment, for example, the aforementioned gap between the two bones may be the gap between the sacrum and the ilium, and the sacrum material fills the gap between the sacrum and the ilium to assist the sacrum and the ilium. The bones are fused at the joints. The sacrum and the ilium are located in the lower part of the body, and there is not a high demand for the joint movement margin between the sacrum and the ilium. After the sacrum and the iliac bone are combined into a new bone body by fusion, the effect on the user's movement is limited.

In one embodiment, the fusion assisting device 11 is made of titanium alloy material or polyether ether ketone (PEEK) material, or is mainly made of titanium alloy material or polyether ether ketone material. Among them, titanium alloy materials and polyether ether ketone materials are both high-strength materials, and the materials used in this new model are medical-grade materials, that is, easy to sterilize, sterile treatment, stable materials in the medical process, and do not affect the health of users. Grade material.

The function of the guide pin 12 is used to determine a predetermined position of a fusion assisting device between the sacrum and the ilium. In one embodiment, the guide pin 12 is first guided to a predetermined position of the fusion assisting device (Figure 2). The predetermined position of the fusion assisting device is the predetermined position of the fusion assisting device in the joint. The fusion assisting device 11 is sleeved outside the guide pin 12 through the guide pin hole 113, so that the fusion assisting device 11 can be guided by the guide pin 12 The predetermined insertion angle (which may be a three-dimensional angle relative to the sacrum and the ilium) pushes the fusion assisting device 11 into a predetermined position of the proper fusion assisting device between the sacrum and the ilium. After the fusion assisting device 11 is placed in a proper position in the joint, and the two bones in the joint are in the expected position, the guide pin 12 can be withdrawn from the joint, so as not to hinder the injection of the bone material into the fusion assisting device.

In one embodiment, the continuous push-pull slotted thread 111 and the lateral external thread 112 on the surface of the fusion assisting device 11 are threaded on the surface of the sacrum and ilium. Pushing into the auxiliary track in the joint, when rotating the fusion assisting device 11, the fusion assisting device 11 is implanted in the depth of the joint simultaneously, and the fusion assisting device 11 can open the gap between the sacrum and the ilium. This method can effectively remove the cortical bone, has a better bone fusion effect, and will not damage the nerves and blood vessels in the bone. Moreover, this method can remove the excess part of the joint, which has the effect of pathological treatment.

When the bone fusion effect is not good, the fusion assisting device 11 of the present invention can be taken out and re-implanted without causing major damage to the bone.

5, in an embodiment, the outer diameter of the lateral external thread 112 of the fusion assisting device 11 corresponds to a predetermined gap size between the sacrum and the ilium. After the predetermined gap size between the sacrum and the ilium is determined, the fusion assisting device 11 having the lateral external thread 112 corresponding to the outer diameter can be selected to perform the aforementioned implantation of the fusion assisting device 11.

In one embodiment, the accommodating cavity 114 is basically a cylindrical space, and the outer diameter of the cylindrical space (FIG. 4, the dashed line shows the inner diameter) is greater than or equal to the outer diameter of the guide pin hole 113. In this way, the overflow amount of the bone filling material from the guide pin hole 113 is controlled.

The present invention has been described above with reference to the embodiments, but the above are only for making it easier for those familiar with the technology to understand the content of the present invention, and are not used to limit the scope of rights of the present invention. Under the same spirit of the present invention, those familiar with the technology can think of various equivalent changes. The scope of the new model shall cover the above and all other equivalent changes. For example, the ratio of the guide pin hole to the outer diameter of the accommodating cavity, the design of the push-pull slotted thread and the side external thread, the shape of the side slot, etc., the user can decide the specifications to use according to needs, not limited to instructions or As described in the diagram. In addition, the predetermined position of the device between the sacrum and the ilium may not be limited to one, such as at least two predetermined positions of the device, or the sacrum and the ilium on both sides.

10: Joint fusion assist device

11: device

111: Push-pull slotted thread

112: Side external thread

113: guide pin hole

114: accommodating cavity

115: side slot

12: guide pin

AA, BB: Section line

CC: reference center axis

Fig. 1 shows a schematic diagram of inserting a device into a bone according to the prior art.

Figures 2, 3, 4, and 5 show a joint fusion assisting device according to an embodiment of the present invention, and schematic diagrams of the devices therein.

10: Joint fusion assist device

11: device

12: guide pin

Claims (9)

A joint fusion assisting device for adjusting the gap between two bones in a joint. The joint fusion assisting device comprises: a push-pull slotted thread and a lateral external thread substantially surrounding the outer surface of the device. The device has a container. The device is provided with a side slot on the outer surface of the device, wherein the accommodating cavity and the side slot are connected to form a continuous space. The joint fusion assisting device according to claim 1, wherein the gap between the two bones and the continuous space are filled with a bony material to assist the two bones in fusion (Fusion) at the joint. The joint fusion assisting device according to claim 2, wherein the space between the two bones is the space between the sacrum and the ilium, and the bony material assists the sacrum and the ilium at the joint Perform fusion. The joint fusion assisting device according to claim 3, wherein after the continuous space is filled with the bony material, the bony material overflows from the side groove to the sacrum and the ilium. The joint fusion assisting device according to claim 1, wherein the device is made of titanium alloy material or polyether ether ketone (PEEK) material. The arthrodesis assisting device according to claim 1, wherein the device has a guide pin hole, and the device is positioned at a predetermined position by a guide pin passing through the guide pin hole of the device. The joint fusion assisting device according to claim 3, wherein the push-pull slotted thread and the lateral external thread are threaded on the surface of the sacrum and the ilium, and the device is implanted deep in the joint, The device is made to open the gap between the sacrum and the ilium. The arthrodesis assisting device according to claim 7, wherein the device has a guide pin hole, a guide pin passes through the guide pin hole of the device to position the device at a predetermined position, and the device is guided to the device predetermined position Before positioning, the sacrum and the ilium do not need to be pre-drilled. The joint fusion assisting device according to claim 7, wherein the outer diameter of the lateral external thread of the device corresponds to a predetermined gap size between the sacrum and the ilium.

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