Bone traction device

Abstract

The utility model relates to a bone traction device which comprises a traction needle and first sleeves symmetrically sleeved at two ends of the traction needle, screw holes are radially formed in the first sleeves in a penetrating manner and are pre-locked by screws, traction arms are vertically and fixedly arranged outside the first sleeves, second sleeves are fixedly arranged at the other ends of the traction arms, and the second sleeves are fixedly connected with the traction needle. A connecting rod is arranged in the two second sleeves in a penetrating mode and fastened through nuts, internal threads are arranged on the outer sides of the first sleeves, the first sleeves are fastened with extension sleeve pieces on the traction needles penetrating out of the first sleeves through the internal threads, and tail caps used for abutting against the ends of the traction needles are connected to the outer sides of the extension sleeve pieces in a threaded mode. The traction needle is effectively prevented from shifting, and the operation is convenient.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, in particular to a bone traction device. Background Art

[0002] Bone traction is a commonly used procedure in orthopedic clinics. It is often used for tibia and fibula fractures with soft tissue injuries, which require frequent observation of the soft tissue; intertrochanteric fractures of the femur, where the fracture shortens significantly and requires traction for immobilization and pain relief; and conservative treatment of femoral fractures in children. Bone traction is widely used because it can achieve effective traction weight, can provide continuous traction, and even allow for early exercise of some joints. Currently, the commonly used bone traction device is operated by passing a bone pin through a specific part of the bone until both ends are exposed at almost the same length. A traction bow is then installed at both ends of the bone pin, tightened, and then a certain weight of traction is applied by roller skating.

[0003] During the operation, the following problems often occur: the patient's limbs are of different sizes, the size of the traction bow cannot be changed, installation is difficult, and even traction bows of various sizes need to be prepared; the screws are not tightened enough, causing the traction to fall off, or the screws are tightened too much, causing the screw threads to be damaged; the exposed parts of both ends of the steel needle are sharp, which can easily cause injury due to accidental contact; the steel needle slips, causing compression necrosis of the soft tissue at the needle eye site.

[0004] Chinese utility model patent CN219048779U discloses a split-type bone traction arch and bone traction assembly. This design replaces the original one-piece arch with a split-type design, which is then connected using a connector. During use, the distance between the two traction arms can be increased or decreased by rotating the connector and twisting the two lateral ends into the connector. The split-type structure also avoids damage to the arch caused by repeated bending during use, extending its service life. However, in practice, the screws are difficult to tighten and can easily break if tightened too tightly. Furthermore, the problem of the bone pin slipping within the bone is not addressed. Utility Model Content

[0005] In view of the deficiencies in the existing technology, the technical problem to be solved by the present invention is to provide a bone traction device that is not only structurally reasonable, but also effectively solves the problems of the traction device being unable to be adjusted in size and difficult to install; the problem of screws and joints being easily damaged; and the problem of bone pin slippage.

[0006] In order to solve the above technical problems, the technical solution of the utility model is: a bone traction device, comprising a traction needle and a first sleeve symmetrically arranged at both ends of the traction needle, the first sleeve having screw holes radially penetrated therethrough and pre-locked by screws, a traction arm vertically fixed to the outside of the first sleeve, a second sleeve fixed to the other end of the traction arm, connecting rods passed through the two second sleeves and fastened with nuts, an internal thread provided on the outside of the first sleeve and fastened to the extension sleeve on the traction needle passing through the first sleeve through the internal thread, and a tail cap screwed to the outside of the extension sleeve for connecting to the end of the traction needle.

[0007] Furthermore, one end of the extension kit is provided with an external thread for threaded connection to the first sleeve or an adjacent extension kit, and the other end is provided with an internal thread for connecting to the adjacent extension kit or a tail cap.

[0008] Furthermore, the tail caps are composed of a cap head and a connecting portion, and the connecting portion is provided with an external thread for connecting to an extension kit.

[0009] Furthermore, a limiting hole for limiting and abutting against two ends of the traction needle is coaxially provided on the connecting portion of the tail cap from outside to inside.

[0010] Furthermore, a baffle is connected to the inner side of the first sleeve, and the outer side of the baffle is fixedly connected to a connecting cover plate for covering the first sleeve. The connecting cover plate is provided with screw holes corresponding to the screw holes and is fixed to the first sleeve by screws. The lower end of the baffle is provided with a recessed groove for the traction needle to pass through.

[0011] Furthermore, the connecting rod is a screw rod.

[0012] Furthermore, the extension kit is divided into a long extension kit and a short extension kit due to different lengths.

[0013] Compared with the prior art, the present invention has the following beneficial effects: the traction device is modular and can be adjusted according to the size of the limbs. The same traction device is suitable for a variety of parts and different limb sizes. It is easy to install, and the two ends of the bone needle are closed after installation to avoid damage. After installation, the device is firm, the traction needle is fixed in the device and cannot move, and the screws do not need to be tightened too much to avoid damage to the screws. A baffle is designed to effectively prevent the bone needle from slipping and protect the patient's skin.

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0016] Figure 2This is a schematic diagram of the structure of the embodiment of the utility model without the connecting rod;

[0017] Figure 3 This is a partial explosion diagram of an embodiment of the present utility model;

[0018] Figure 4 A top view of an embodiment of the present utility model;

[0019] Figure 5 for Figure 4 Cross-sectional view of AA;

[0020] Figure 6 for Figure 5 A magnified schematic diagram of B in the middle;

[0021] Figure 7 for Figure 5 A magnified schematic diagram of C in the middle.

[0022] In the figure: 1-traction needle, 2-first sleeve, 3-screw hole, 4-screw, 5-traction arm, 6-second sleeve, 7-connecting rod, 8-nut, 9-extension kit, 10-tail cap, 11-external thread, 12-internal thread, 13-cap head, 14-connecting part, 15-limiting hole, 16-baffle, 17-connecting cover plate, 18-screw hole, 19-allowance groove, 20-long extension kit, 21-short extension kit, 22-hollow tail cap, 23-hanging ring, 24-solid tail cap, 25-through hole. DETAILED DESCRIPTION

[0023] In order to make the above features and advantages of the present invention more obvious and easy to understand, embodiments are given below with reference to the accompanying drawings for detailed description.

[0024] like Figures 1 to 7 As shown, a bone traction device comprises a traction needle 1 and two groups of first sleeves 2 symmetrically arranged at both ends of the traction needle, at least one group of screw holes 3 are radially penetrated on the first sleeves and pre-locked by screws 4, a traction arm 5 is vertically fixed to the outside of the first sleeve, and a second sleeve 6 is fixed to the other end of the traction arm, the second sleeve is oriented in the same direction as the through hole in the first sleeve, and both are horizontal, a connecting rod 7 is passed through the two second sleeves and is fastened by a nut 8, an internal thread is provided on the outer side of the first sleeve and is fastened to the extension sleeve 9 on the traction needle passing through the first sleeve through the internal thread, a through hole 25 for the traction needle to pass through is coaxially opened in the extension sleeve, and a tail cap 10 is screwed onto the outside of the extension sleeve for connecting to the end of the traction needle.

[0025] In the embodiment of the present invention, one end of the extension kit is provided with an external thread 11 for threaded connection to the first sleeve or an adjacent extension kit, and the other end is provided with an internal thread 12 for connecting to the adjacent extension kit or the tail cap.

[0026] In the embodiment of the present invention, the tail cap is composed of a cap head 13 and a connecting portion 14, and the connecting portion is provided with an external thread for connecting to an extension kit.

[0027] In the embodiment of the present invention, the connection portion of the tail cap is coaxially provided with a limiting hole 15 from the outside to the inside for limiting the contact with the two ends of the traction needle. The tail cap can be divided into a hollow tail cap 22 and a solid tail cap 24 according to whether the limiting hole is provided.

[0028] In the embodiment of the present utility model, a baffle 16 is connected to the inner side of the first sleeve, and the outer side of the baffle is fixedly connected to an arc-shaped connecting cover plate 17 for covering the first sleeve. The connecting cover plate is provided with screw holes 18 corresponding to the screw holes and is fixed to the first sleeve by screws. The lower end of the baffle is recessed upward with a make way groove 19 for the traction needle to pass through.

[0029] In the embodiment of the present invention, the connecting rod is a screw rod, and a hanging ring 23 for traction is fixed in the middle of the connecting rod.

[0030] In the embodiment of the present invention, the extension kit is divided into a long extension kit 20 and a short extension kit 21 due to different lengths.

[0031] In an embodiment of the present invention, a tube hole for the traction needle to pass through is formed in the first sleeve, and a tube hole for the connecting rod to pass through is formed in the second sleeve.

[0032] The working principle of the embodiment of the present invention is as follows: first, a suitable traction needle is selected (generally a 3.5*250mm round bone needle), and the traction needle is inserted into the bone in the specified direction of each part until the two ends are exposed at almost the same length.

[0033] Then, install the traction arm and the first sleeve. The left and right traction arms are exactly the same. When installing, the threaded side of the first sleeve should face outward, and the needle hole should be inserted along the traction needle to the appropriate position. At this time, the screws can be screwed in radially above the first sleeve. Just screw it in by hand until it cannot be screwed anymore. It does not need to be tightened very tightly.

[0034] At this point, observe the remaining exposed length of the traction needle. Different installation combinations are available based on the exposed length of the traction needle. For a given length, there is not just one combination, but usually multiple combinations. If the traction needle protrudes within 3mm of the traction arm, select a standard hollow tail cap for installation; if it protrudes 3-15mm, select a long extension kit and a solid tail cap; if it protrudes 15-20mm, select a short extension kit, a long extension kit, and a solid tail cap; if it protrudes 20mm, add a long extension kit and repeat the initial steps.

[0035] Figure 4As an example, the traction pins are of different lengths on both sides of the bone. In practice, it is not possible to make the exposed traction pins of equal length at both ends. As can be seen from the figure, the connection does not need to be a perfect fit, but radial and axial limits are used to synchronize the positioning of the traction pins.

[0036] Finally, install the connecting rod. The connecting rod with a nut can be pre-threaded through the second sleeve at both ends. After positioning the traction needle, rotate the nut to secure it in place. If the connecting rod is difficult to install, unscrew one screw and temporarily remove the traction arm on that side. Then, pre-install the nut on the connecting rod and align the tube hole of the traction arm and the second sleeve core with the traction needle and connecting rod at the same time. Tighten the nut and screw to install. The connecting rod nut can be adjusted to the center of the two traction arms. Tighten the nut by hand, and subsequent traction work can be carried out without tools.

[0037] Normally, the traction needle does not necessarily slip in the bone. Therefore, there is no need to install a baffle at the beginning. You can select a longer screw in the distal screw hole and a longer screw in the proximal screw hole and tighten them by hand. If the traction needle slips in the bone, the first sleeve of the traction arm will squeeze the soft tissue of the needle eye and cause pain. At this time, you can knock back the traction needle and install a baffle. When installing the baffle, you can choose to screw a long screw and a short screw into the distal screw hole and the proximal screw hole respectively to fix it. After fixing, you can put a bandage between the baffle and the skin to block it.

[0038] The present invention is not limited to the above-mentioned best embodiment. Anyone can come up with other forms of bone distraction devices based on the inspiration of the present invention. All equivalent changes and modifications made within the scope of the patent application of the present invention shall fall within the scope of the present invention.

Claims

1. A bone distraction device, characterized in that: It includes a traction needle and a first sleeve symmetrically arranged at both ends of the traction needle, the first sleeve is radially penetrated with a screw hole, a traction arm is fixed to the outside of the first sleeve, the other end of the traction arm is fixed with a second sleeve, the two second sleeves are passed through with a connecting rod and are fastened with a nut, the outer side of the first sleeve is provided with an internal thread and is fastened to the extension sleeve on the traction needle passing through the first sleeve through the internal thread, and the outside of the extension sleeve is screwed with a tail cap for connecting to the end of the traction needle.

2. A bone distraction device according to claim 1, characterized in that: One end of the extension kit is provided with an external thread for threaded connection to the first sleeve or an adjacent extension kit, and the other end is provided with an internal thread for connecting to the adjacent extension kit or a tail cap.

3. A bone distraction device according to claim 2, characterized in that: The tail caps are composed of a cap head and a connecting portion, and the connecting portion is provided with an external thread for connecting an extension kit.

4. The bone distraction device according to claim 1, characterized in that: The connecting portion of the tail cap is coaxially provided with a limiting hole from the outside toward the inside for limiting and abutting against the two ends of the traction needle.

5. The bone distraction device according to claim 1, characterized in that: The inner side of the first sleeve is connected to a baffle, and the outer side of the baffle is fixedly connected to a connecting cover plate for covering the first sleeve. The connecting cover plate is provided with screw holes corresponding to the screw holes and is fixed to the first sleeve by screws. The lower end of the baffle is recessed upward with a makeshift groove for the traction needle to pass through.

6. The bone distraction device according to claim 1, characterized in that: The connecting rod is a screw rod.

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