TWI528954B - Dynamic external fixation device - Google Patents

Description

Dynamic external fixation device

The invention is applied to the field of fracture treatment, in particular to a method for providing a stable fixed and sustained release of a stable opening tension, maintaining an intra-articular space at a bone fixation site and providing an angle of the joint movement. Auxiliary equipment for long-term fixation of fixed joint contracture.

For patients with fractures, the main treatment method is to return the fracture to the normal position by external force, and then apply the fixation device, and let the affected part heal itself after a period of time. Because the treatment time is not short-lived, if the fixation is improper, it will seriously hinder the patient's daily activities. Therefore, how to effectively fix the affected part of the fracture is a very important research topic.

For fractured parts, the general external fixation device does not provide the activity required for dynamic activities and can only provide a fixed support. Therefore, if the fracture part contains joints, it not only affects the daily life, but also can not maintain the gaps in the joints. In the future, there will be joint contracture after the recovery. The patient needs to undergo rehabilitation treatment to reconstruct the joint activity angle.

The conventional technology, such as the "arm adjustment device of the elbow joint" of the M256157 of China, mainly comprises two tight fitting structures, two accommodating structures, a first pivoting structure and a second pivoting connection. One end of the two receiving structures is respectively disposed on one end of the two tight fitting structures, and one end of the first pivoting structure can be coupled to another opposite end of a receiving structure thereof, the second pivoting structure One end may be coupled to the other opposite end of the other receiving structure, and the other opposite end of the second pivoting structure may be pivotally connected to the opposite end of the first pivoting structure. The prior art can provide the working angle required for bending and stretching of the hand joint, but the structural design is complicated, the use is inconvenient, and the volume is too large, which is not advantageous for the fracture fixation of the metacarpophalangeal joint.

Another conventional technique, such as the "Dynamic external fixation device" of US 6,063,087, is composed of first, second and a movable component, and the first and second components can be fixed to the bone through a fixed needle, and the movable component is connected. The first and second components can provide an adjustment of the angle. The prior art also provides the angle of motion required for bending and stretching of the hand shaft, but the problem is also that the structural design is complicated, inconvenient to use, and because of the large volume, it is not advantageous for the fracture fixation of the metacarpophalangeal joint.

A further prior art, such as the "Hand external fixation and joint mobilization and distraction device" of US 5,941,877, which comprises two main support components, each of which has a slidably adjustable connection on one side, and a steel needle for attaching the bone to the bone. , as well as movable ball and socket joints to provide an angle of activity. The prior art utilizes a ball and socket joint to provide an activity of the external fixation device, so that the patient can also have the mobility of the metacarpophalangeal joint when using the external fixation, and prevent complications, but also has a complicated structure and is caused by use. The problem of inconvenience to the patient, and the use of ball and socket joints does not provide a consistently stable tension of the joint.

Obviously, the common problems of the aforementioned conventional techniques are that the structure is too complicated, it is difficult to use on the device, and the problem of increasing the workload of the patient is really necessary to be improved.

In view of this, the creators of this case have improved and innovated and successfully completed the research and development. This dynamic external fixation device can provide a better patient fixation device for fracture patients.

The main object of the present invention is to provide a dynamic external fixation device which can provide a stable support and continuously release a stable opening tension, which is not changed drastically due to an increase in the deformation of the dynamic external fixation device to maintain the operation. The intra-articular space of the area is also comfortable, and provides the angle required for joint movement in the operation area to prevent tissue stickiness and joint contracture caused by long-term fixation.

Another object of the present invention is to provide a dynamic external fixation device which is simple in structure and minimizes the influence of external fixation on a patient and maintains activities in daily life.

It is still another object of the present invention to provide a dynamic external fixation device which is easy to form and has a simple and rapid operation, and can reduce discomfort to the patient during surgery.

A dynamic external fixing device provided by the embodiment of the invention includes: a first bracket group, a second bracket group, and at least one elastic member.

The dynamic external fixation device is mainly applied to the fracture fixation of the metacarpophalangeal joint, wherein the first stent group and the second stent group are respectively fixed on the bones at both ends of the joint, and are fixed by a fixing member. A resilient member is coupled between a bracket set and the second bracket set.

By using an elastic member having good elastic properties, it is possible to provide a stable fixed and sustained release of a stable opening tension, which is not changed drastically due to an increase in the deformation of the dynamic external fixation device, so as to maintain the intra-articular region of the operation region. Space and comfort at the same time. And the pivotable end of the elastic member provides the angle required for the joint to prevent tissue sticking and joint contracture caused by immobilization for a long time.

1‧‧‧First stent set

11‧‧‧First Fixed Department

12, 22‧‧‧through holes

2‧‧‧Second bracket set

21‧‧‧Second fixed department

3‧‧‧Flexible parts

31‧‧‧Geometric deformation zone

41‧‧‧ pivotal department

42‧‧‧ pivoting department

5‧‧‧ joints

51, 52‧‧‧ bones

6‧‧‧Fixed parts

10‧‧‧Dynamic external fixture

F‧‧‧action tension

S‧‧‧ path length

1 is a perspective exploded view of the present invention; FIG. 2 is a perspective sectional view of the present invention; FIG. 3 is a view showing an embodiment of the present invention; FIG. 4 is a view showing another embodiment of the present invention; A structural change diagram of the present invention; and a sixth flowchart of the present invention.

In order to make the objects, technical solutions and advantages of the present invention more comprehensible, the present invention will be further described in detail with reference to the accompanying drawings.

As shown in FIG. 1 to FIG. 3, a dynamic external fixation device 10 according to the present invention mainly includes a first stent set 1, a second stent set 2, and at least one elastic member 3. The first bracket group 1 has a first fixing portion 11 , and the second bracket group 2 has a second fixing portion 21 . The two ends of the elastic member 3 are respectively connected to the first bracket group 1 and the second bracket group 2 . The elastic member 3 has at least one geometrically deformable region 31 having a variable length S in the direction in which the elastic member 3 extends.

The first bracket group 1 and the second bracket group 2 are each a two-symmetric metal plate body, wherein the two metal plate bodies of the first bracket group 1 extend outward from the first fixing portion 11 and have a pivoting portion. 41 or the second metal plate body of the second bracket group 2 extends outward from the second fixing portion 21 In the pivoting portion 41 , the elastic member 3 has a pivoting portion 42 , and the pivoting portion 42 is coupled to the pivoting portion 41 .

The dynamic external fixation device 10 completed as described above is mainly applied to the fracture fixation of the metacarpophalangeal joint 5. The first bracket group 1 and the second bracket group 2 are respectively fixed on the bones 51 and 52 at the two ends of the joint 5, and the elastic member is connected between the first bracket group 1 and the second bracket group 2 3.

The elastic member 3 has a U-shaped curved deformation region 31, and the geometric deformation region 31 can adjust the diameter S by extending toward the extending direction of the elastic member 3, thereby providing a stable fixing and continuously releasing a stable size. The opening action tension F (Fig. 6) is not drastically changed by the increase in the amount of deformation of the dynamic external fixation device 10, so as to maintain the space inside the joint 5 of the operation zone and at the same time have a comfortable feeling. The pivoting portion 41 and the pivoting portion 42 provide the angle required for the joint 5 to move, preventing tissue stickiness and joint contracture caused by immobilization for a long time.

Each of the first fixing portion 11 and the second fixing portion 21 is formed with at least a constant hole 12, 22 for a fixing member 6 to pass through the first bracket group 1. Two stent sets 2 are attached to the bones 51, 52 to obtain sufficient fixation force.

Referring to FIG. 3, the first stent set 1 is disposed at the bone 51 at the proximal end of the palm, and the second stent set 2 is disposed at the bone 52 at the distal end of the palm; or As shown in Fig. 4, the second stent set 2 is placed at the bone 51 at the proximal end of the palm, and the first stent set 1 is placed at the bone 52 at the distal end of the palm. The elastic member 3 is disposed adjacent to the first bracket group 1 or the second bracket group 2, and is coupled to the pivot portion 42 by the pivoting portion 41, and is disposed at the center of rotation of the joint 5, thereby providing The angle required for the joint 5 to move Degree, the function of continuously releasing the stretching force F is exerted to prevent the joint 5 from contracting.

In addition, the connecting end of the elastic member 3 and the first bracket group 1 and the second bracket group 2 can be adjusted. For example, one end of the elastic member 3 is fixed to the second bracket group 2, and the elastic member 3 is The other end is pivotally coupled to the first bracket set 1; of course, one end of the elastic member 3 can also be fixed to the first bracket set 1, and the other end of the elastic member 3 can be pivotally coupled to the second bracket Bracket set 2.

The number of the elastic members 3 is at least one. In this embodiment, two of the elastic members 3 are disposed at the same time. The two ends of the two elastic members 3 are respectively connected to the first bracket group 1 and the second bracket group 2.

Thereby, one or two elastic members 3 can be connected to the first bracket group 1, or one or two elastic members 3 can be connected to the second bracket group 2, and can be changed according to actual needs.

Referring to FIG. 5, the structure of the present invention can be further changed, wherein the first bracket group 1 and the second bracket group 2 are two asymmetric metal plates, and the first bracket group 1 The metal plate body extends outwardly from the first fixing portion 11 to have a pivoting portion 41, or the metal plate body of the second bracket group 2 extends the pivoting portion 41 outwardly from the second fixing portion 21, the elastic member 3 There is a pivoting portion 42 , and the pivoting portion 42 is correspondingly coupled to the pivoting portion 41 .

In addition, the elastic member 3 is divided into the U-shaped curved geometric deformation region 31, and any geometric deformation can be adopted to complete the geometric deformation region 31, so that the radial length S of the geometric deformation region 31 can be changed. To provide a stable and sustained action tension F.

The first bracket group 1, the second bracket group 2, and the elastic member 3 are formed of a shape memory alloy. The shape memory alloy is a nickel-titanium alloy, and the characteristics of the memory of the nickel-titanium alloy are not only easy to manufacture but also simple in operation.

The process for manufacturing the dynamic external fixture 10 from nickel titanium alloy includes: 1. Titanium-nickel alloy sheet forming process; 2. Sheet metal machining; 3. Superelastic thermal mechanism; and 4. Surface passivation treatment.

The dynamic external fixation device 10 required by the present invention can be completed by the aforementioned simple manufacturing process.

As shown in FIG. 6, the surgical implementation process of the dynamic external fixation device 10 for Nitinol molding includes: Step 1. Cooling the dynamic external fixation device 10 of the present invention, applying an external force to shorten the diameter of the geometric deformation region 31 Length S; Step 2. Fix the dynamic external fixation device 10 to the fracture by means of a fixing member 6 such as a steel needle or a nail; and Step 3. Reheat to room temperature to restore the dynamic external fixation device 10 to elasticity. The radial length S of the geometric deformation zone 31 is modulated to produce a continuously stable acting tension F at the joint 5.

The above-mentioned patented dynamic external fixing device has the following advantages compared with the conventional technology:

1. The invention has simple operation and can provide a stable force to continuously act on the injured joint and prevent joint contracture.

2. The structure of the present invention is small in size and only 1-2 mm in thickness, which can minimize the influence of external fixation on patients and maintain activities in daily life.

3. The design of the invention is simple, and does not require complicated processing, and can be completed by simple mechanical processing, thermal mechanism and surface treatment.

The detailed description of the preferred embodiments of the present invention is intended to be limited to the scope of the invention, and is not intended to limit the scope of the invention. The patent scope of this case.

1‧‧‧First stent set

11‧‧‧First Fixed Department

12, 22‧‧‧through holes

2‧‧‧Second bracket set

21‧‧‧Second fixed department

3‧‧‧Flexible parts

31‧‧‧Geometric deformation zone

41‧‧‧ pivotal department

42‧‧‧ pivoting department

6‧‧‧Fixed parts

10‧‧‧Dynamic external fixture

S‧‧‧ path length

Claims (7)

A dynamic external fixing device comprises: a first bracket group having a first fixing portion; a second bracket group having a second fixing portion; and at least one elastic member, one end of which is fixed to one of the bracket groups, And the other end of the elastic member is pivotally coupled to the other bracket group, the elastic member has at least one geometric deformation region, and the geometric deformation region has an adjustable diameter length in the extending direction of the elastic member, wherein the fixing portion is outwardly The extending portion has a pivoting portion, and the elastic member has a pivoting portion, the pivoting portion is correspondingly coupled to the pivoting portion, and the pivoting portion and the pivoting portion are disposed at a joint rotation center. The dynamic external fixing device according to claim 1, wherein the elastic members are two, and the two elastic members are respectively fixed at one end thereof to one of the bracket groups, and the two elastic members are pivotable at the other end thereof. Transfer the ground to another bracket group. The dynamic outer fixing device according to claim 2, wherein the two elastic members are curved curved plates, and the geometric deformation regions are located at concave arcs of the two elastic members. The dynamic external fixation device of claim 1, wherein the first stent group and the second stent group are each a two-symmetric metal plate body, wherein the two metal groups of one of the bracket groups Each of the fixing portions of the plate body has a pivoting portion extending outwardly, and the elastic member has a pivoting portion, and the pivoting portion is correspondingly coupled to the pivoting portion. The dynamic external fixation device of claim 1, wherein the first stent group and the second stent group are two asymmetric metal plates, each of the two stent groups. A metal plate body extends outwardly from the fixing portion to have a pivoting portion, and the elastic member has a pivoting portion, and the pivoting portion is coupled to the pivoting portion. The dynamic external fixation device of claim 1, wherein the first fixing portion and the second fixing portion are each formed with at least a consistent hole for a fixing member to pass through. The dynamic external fixation device according to claim 1, wherein the first stent group, the second stent group and the elastic member are formed of a shape memory alloy, and the shape memory alloy is a nickel titanium alloy.