TWI576085B - A securing device for a long bone - Google Patents

Description

Long bone fixation device

The invention relates to a long bone fixing device, in particular to a fixing device of a long bone joint end and a bone end.

The skeletal system of the human body is used to support the body, protect organs, and cooperate with the muscle system to exercise. Depending on the function, the shape of the bone can be roughly divided into a long bone, a short bone, a flat bone, and an irregular bone. The long bone is mainly located in the extremities. It refers to long bones with a length greater than the width. For example, the humerus, the tibia, the tibia, and the long bone can be divided into the backbone and the enlarged bones at both ends. The surface of the epiphysis has an articular surface. It can be combined with the articular surface of adjacent bone to form a movable joint for a wide range of activities. The short bone is mainly distributed on the wrist, the foot and the spine. The shape is short column or cuboid. The short bone has multiple articular surfaces, which can form micro-joint joints with adjacent bones. The shape of the flat bone is curved and is mainly used to protect the internal organs and the attachment surface of the muscles, such as the skull to protect the soft tissue in the brain. Irregular bones are called because of their irregular shape and do not belong to the above three categories, such as vertebrae.

The bone shape of each part of the human body is not the same and the structure is complicated. If a fracture or the like occurs due to an external force, the medical treatment and the resetting method usually require appropriate treatment according to the bone structure of the injured part. The traditional method is fixed by plaster, and when the fracture site is close to the joint end or the end of the epiphysis, the unstable bone fragments at the joint end may be dislocated again in the gypsum, and the gypsum may lead to appearance malformation and joint dysfunction. Therefore, it is common to implant a fixation device at the fracture of the joint end or at the fracture of the epiphysis to perform bone reduction.

Taking the distal radius fracture of the wrist as an example, the distal radius fracture is a fairly common fracture. According to the direction of the fracture displacement, it can be roughly divided into three categories, including Colles' fracture and Smith's fracture. (Smith's Fracture) and Barton's Fracture. Among them, Colles' fracture refers to the fracture of the distal radius caused by the displacement of the broken bone to the dorsal when the patient falls to the ground; Smith's Fracture ) the distal radius fracture caused by the displacement of the broken bone to the volar due to the back of the hand; the Barton fracture (Barton’s Fracture) refers to the fracture of the articular surface through the distal part of the humerus, which causes the articular surface to have broken bones. This is a more severe fracture, usually accompanied by joint dislocation.

Since the distal end of the humerus involves the activity of the wrist joint, and the wrist joint is a commonly used joint in daily life, in recent years, the traditional cast immobilization method has gradually changed to the implant fixation device as the fracture reduction of the distal radius. A common distal humeral fixation device is performed by a humeral distal fixation device for bone reduction. However, today's distal tibial fixation devices are for Colles' fracture and Smith's Fracture. It has a better reduction effect and has limited stability for Barton's Fracture with severe joint damage. Furthermore, the fragmented bone of the distal humeral articular surface may be located on the dorsal side, and the distal humeral fixation device currently implanted by the volar side cannot effectively fix the fragmented bone on the dorsal side.

Because the distal radius fracture often breaks into the articular surface, if the fixation device fails to grasp the fragmented bone of the articular surface stably, it may lead to unstable fragmentation during the reduction process and wrist rehabilitation. The bone block is displaced again; in addition, if the fixation device cannot fix the fractured bone of the articular surface to the correct position, the uneven joint surface after the reduction will lead to an increased risk of post-traumatic arthritis; At the end of the bone, there is also a part of the backbone. If the fixing device cannot be stably locked on the backbone, it may cause loosening or displacement of the fixing device.

In view of the above problems, the object of the present invention is to provide a long bone fixation device having a claw portion for fixing a fragmented bone piece implanted on the articular surface of the joint, which can be strengthened on the joint surface of the long bone fixation device. Stability, in which the operator can remove the claws partially or completely. Wherein, the long bone fixing device can be provided with a groove for connecting the claw portion, so that after the claw portion is removed, the residual rough folding edge can be located in the groove to prevent the rough folding edge from injuring the surrounding soft tissue.

Another object of the present invention is to provide a long bone fixation device capable of fixing the articular surface fragmentation bone on the posterior side, where the posterior side is the implant side relative to the long bone fixation device.

Another object of the present invention is to provide a long bone fixation device, wherein the fixing device placed on the backbone portion has staggered oblique perforations, so that the bone nail can be formed into an interlocking structure after being implanted into the perforation, which can increase the tensile strength of the fixing device. .

In view of the above, the present invention provides a long bone fixation device comprising an integral portion having a positioning hole; a head extending from the body; at least one claw extending from the head, wherein the body The portion, the head and the at least one claw are integrally formed in sequence; and the plurality of perforations are coherent Wear on the body and the head.

Preferably, the body of the long bone fixing device has 3 to 9 perforations.

Preferably, each of the plurality of perforations of the body of the long bone fixing device is inclined by 4° to 8° to the opposite side of the vertical axis to penetrate the body.

Preferably, the head of the long bone fixing device has an angle of 15° to 25° with the body.

Preferably, the head of the long bone fixing device is provided with at least one groove for connecting the at least one claw portion.

Preferably, the long bone fixation device has three claws extending from the head.

Preferably, the head of the long bone fixation device has eight perforations.

Preferably, at least one of the plurality of perforations of the head of the long bone fixation device corresponds to at least one epiphysis of the dorsal lateral waterline of the distal radius.

Preferably, the plurality of perforations of the long bone fixation device are in the form of screw holes.

Preferably, the device for the long bone fixation device further comprises a plurality of through holes extending through the head and the body.

The advantages and other advantages of the present invention will be apparent from the following description of the preferred embodiments.

3a, 3b, 3c, 3d, 3e, 3f, 3g, 3h, 3i, 3j, 3k‧ ‧ piercing

10‧‧‧ head

20‧‧‧ Body

30‧‧‧ bones

40‧‧‧ claws

42‧‧‧ Groove

50‧‧‧through hole

60‧‧‧Positioning holes

70‧‧‧ bone nails

80‧‧‧ watershed line

100‧‧‧Long bone fixation device

The present invention will be fully understood from the following detailed description of embodiments of the invention, To limit the invention. Like reference numerals in the following drawings refer to like elements.

The first figure is an embodiment of the invention, showing a top view of the long bone fixation device.

The second figure shows a left side view of the long bone fixation device in accordance with an embodiment of the first figure.

The third figure is a schematic view showing a claw portion of a long bone fixing device according to another embodiment of the present invention.

The fourth figure is an embodiment of the invention showing a fixation device secured to the volar side of the distal radius.

The fifth figure is another embodiment of the present invention showing a fixation device that is locked to the volar side of the distal radius.

The sixth figure is a rear view of the fixation device secured to the volar side of the distal radius of the humerus in accordance with the fourth and fifth embodiments.

Figure 7 is a rear elevational view of the long bone fixation device in accordance with another embodiment of the present invention.

The embodiments of the present invention are described below by way of specific embodiments, which are familiar with the technology. The person skilled in the art can easily understand the efficacy and advantages of the present invention by the contents disclosed in the present specification. The present invention may be applied and implemented by other specific embodiments. The details of the present invention may be applied to various needs, and various modifications or changes may be made without departing from the spirit and scope of the invention.

The present invention will be described in terms of the preferred embodiments and aspects of the invention, which are intended to illustrate and not to limit the scope of the invention. Therefore, the present invention may be widely practiced in other embodiments in addition to the preferred embodiments described in the specification.

The first embodiment of the present invention is a top view of a long bone fixation device 100, including an integral portion 20 having a positioning hole 60, a head portion 10 extending from the body portion 20, and at least one claw portion 40. Extending from the head 10, wherein the body 20, the head 10 and the claws 40 are integrally formed in sequence; and a plurality of perforations 3 (3a to 3k) are passed through the body 20 of the long bone fixation device of the present invention. And the head 10.

In one embodiment of the present invention, the body portion 20 of the long bone fixation device is a planar plate body that can be placed on the backbone, wherein the positioning hole 60 is an elliptical perforation and penetrates the body portion 20. During the introduction of the fixation device 100 into the fractured wound, the operator can use the positioning hole 60 as a sliding slot, and pass the positioning bone nail as a sliding rod in the positioning hole 60, so that the long bone fixation device 100 can perform a certain degree on the bone. The displacement, such as moving along the long axis of the ellipse of the positioning hole, the long bone fixation device 100 can be finely adjusted through the positioning hole to reduce the angular deviation.

In one embodiment of the present invention, the head 10 of the long bone fixation device 100 is a curved plate extending from one end of the body 20 and can be placed on the epiphysis, wherein the head 10 can be positioned relative to the horizontal axis X. Extending 15°~25° upward along the horizontal axis X of the body, the extended head 10 can be attached to the end of the bone at different curved curvatures.

The second drawing shows a left side view of the long bone fixation device 100 in accordance with an embodiment of the first embodiment of the present invention. In this embodiment, the head 10 can extend upward from the horizontal axis X at 25°, in other words, the head can be at an angle of 25° to the body.

In an embodiment of the present invention, the claw portion 40 of the long bone fixation device 100 can be placed on the articular surface of the epiphysis to fix the fragmented bone of the articular surface, and can strengthen the stability of the fracture of the articular surface fragmentation bone. . In the process of bone reduction, the claw 40 can be directly broken by an external force, so that the operator can partially or completely remove the claw 40 according to the needs of the injury. However, after the claw 40 is removed, a rough fold may remain at the fold, and the rough fold may affect the healing of the wound.

In an embodiment of the third figure, a schematic view of the claw of the long bone fixation device is shown. In an embodiment, the head 10 has at least one recess 42 for connecting at least one of the claws 40 such that when the claw 40 is removed, the rough fold of the fold can be located in the recess 42 of the head 40. In order to prevent the rough hem and the surrounding soft tissue friction, resulting in soft tissue inflammation and delayed healing.

In the embodiment of the third embodiment of the present invention, the head 10 of the long bone fixation device has three recesses 42 and is connected to the three claw portions 40, respectively. During the bone reduction process, the operator can partially or completely remove the three claws 40 according to the needs of the injury.

The fourth figure is an embodiment of the invention showing a fixation device secured to the volar side of the distal radius. When the operator introduces the long bone fixation device 100 onto the tibia, the head 10 is placed on the iliac crest of the distal radius of the humerus, and the body 20 can be placed on the humeral shaft. After the positioning is completed, the operator can pass the nail 70 through a plurality of perforations 3 for securing the long bone fixation device 100 of the present invention to the damaged tibia.

In one embodiment of the invention, the plurality of perforations 3 are perforations having threads. The head 10 placed on the skeleton may have 8 perforations (3a~3h); the body 20 placed on the backbone may have 3 perforations (3i~3k), wherein positioning holes 60 are disposed between 3i and 3j. .

In another embodiment of the present invention, the length of the body 20 away from the head 10 can increase the number of the perforations 3. As in the embodiment of the fifth figure, the body can be increased to 9 perforations, and the operator can rely on the backbone. Select the appropriate long bone fixation device for the length.

In another embodiment of the present invention, the direction of at least one perforation of the head 10 may correspond to at least one epiphysis of the waterside line (MS) of the distal humerus, wherein the watershed line refers to the bone at the end of the bone.嵴Connected line.

Figure 6 is a rear view of the fixation device locked to the volar side of the distal radius of the humerus according to the embodiment of the fourth figure, wherein the three perforations 3f, 3g and 3h of the head penetrate the direction of the head 10, respectively The three metatarsal sacs 30 of the distal tibiofibular waterline 80, so when the nail 70 passes through the perforations 3f, 3g, and 3h from the distal tibia of the humerus, the implantation depth of the nail 70 can reach the dorsal distal end of the humerus. The bone skeleton 30 of the watershed line 80, so that the long bone fixation device 100 of the present invention can lock the humerus by the implantation direction and depth of the head nail 70 in addition to the fragmentation bone of the volar side. The bone on the dorsal side, which in turn increases the stability of the fractured bone of the articular surface.

In another embodiment of the present invention, the plurality of perforations of the body may be inclined 4° to 8° to the opposite sides of the vertical axis to penetrate the body for increasing the tensile strength of the long bone fixation device.

The seventh figure shows a rear view of the long bone fixation device. In this embodiment, the plurality of perforations 3j, 3k of the body are sequentially inclined by 5° to the opposite sides of the vertical axis Y to penetrate the body, so that the operator After the bone nails 70 are sequentially implanted into the staggered oblique perforations 3, the bone nails 70 implanted into the backbone can form an angle of 5° with the vertical axis, and an interlocking structure is formed in the backbone to increase the tensile strength of the body 20 and the backbone. And can avoid the displacement of the long bone fixation device.

The long bone fixation device is further provided with a plurality of through holes 50 penetrating through the body portion 20 and the head portion 10, so that a plurality of through holes 50 are provided for the steel wire to penetrate as a temporary fixing of the long bone fixing device to the bone. In one embodiment of the invention, the head 10 has three through holes 50 and the body 20 has a through hole 50.

In summary of the above embodiments, the long bone fixation device provided by the present invention can enhance the stability of the fracture of the articular surface fragmentation bone and increase the tensile strength of the fixation device. It should be understood by those of ordinary skill in the art that the long bone fixation device of the present invention can be used for other long bone joint fractures, osteophyte fractures, and growth, in addition to the distal radius fractures mentioned in the examples. Plate fractures, etc., the advantages include: (1) the head has a claw for fixing the fragmented bone of the implanted articular surface, wherein the claw can be partially or completely removed; (2) the head has a a groove for connecting the claw portion to prevent the residual rough edge from rubbing against the surrounding soft tissue after the claw is removed; (3) the head is a curved plate body and is at an angle of 25° to the body, so the head When placed at the end of the epiphysis, it can be attached to the curved curvature of the epiphysis surface; (4) the bone nail implanted in the perforation of the head can be implanted to the depth of the waterline of the posterior side, where the posterior side is The opposite side of the implant side enables the fixation device to simultaneously fix the bone on the implant side and the opposite side; and (5) the perforation of the body is staggered obliquely therethrough, so that the bone nail of the implant body is formed The lock structure increases the tensile strength of the fixture.

The above description is a preferred embodiment of the invention. It should be appreciated by those of ordinary skill in the art that the invention is not intended to limit the scope of the claimed invention. The scope of patent protection is subject to the scope of the patent application and its equivalent fields. Modifications or modifications made by those skilled in the art without departing from the spirit and scope of the invention are intended to be equivalents Within the scope of the patent application.

3a, 3b, 3c, 3d, 3e, 3f, 3g, 3h, 3i, 3j, 3k‧ ‧ piercing

10‧‧‧ head

20‧‧‧ Body

40‧‧‧ claws

50‧‧‧through hole

60‧‧‧Positioning holes

100‧‧‧Long bone fixation device

Claims (10)

A long bone fixation device comprising: an integral portion having a positioning hole; a head extending from the body; at least one claw extending from the head, extending from the body and the head An extension of the main shaft formed by the portion, wherein the body portion, the head portion and the at least one claw portion are integrally formed in sequence; and a plurality of perforations are formed through the body portion and the head portion of the long bone fixation device. The long bone fixation device of claim 1, wherein the body has 3 to 9 perforations. The long bone fixation device of claim 1, wherein each of the plurality of perforations is inclined by 4° to 8° to the opposite side of the vertical axis to penetrate the body. The long bone fixation device according to claim 1, wherein the head system is at an angle of 15° to 25° with the body. The long bone fixation device of claim 1, wherein the head portion is provided with at least one groove for connecting the at least one claw portion. The long bone fixation device of claim 1, wherein the device has three claws extending from the head. The long bone fixation device of claim 1, wherein the head has eight perforations. The long bone fixation device of claim 1, wherein at least one of the plurality of perforations of the head corresponds to at least one callus of the dorsal lateral waterline of the distal radius. The long bone fixation device of claim 1, wherein the plurality of perforations are in the form of a screw hole. The long bone fixation device of claim 1, wherein the device further comprises a plurality of through holes extending through the head and the body of the long bone fixation device.