External fixing device for pelvis of child

Abstract

The utility model relates to the technical field of medical instruments, and provides a child pelvis external fixing device which comprises bone needles, a connecting frame and a connecting rod. The number of the connecting frames is two, and the two connecting frames are arranged at the two ends of the connecting rod respectively and rotatably connected with the two ends of the connecting rod. The connecting frame is polygonal, and one end, deviating from the connecting rod, of the connecting frame is rotatably connected with the bone needle; the bone needles at two ends of the connecting rod are mounted on two sides of the pelvis of the child; the connecting frame has a rotating state and a locking state; under the condition that the connecting frame is in the rotating state, the connecting frame can rotate relative to the bone needles and the connecting rods so as to adjust the positions of the bone needles relative to the pelvis of the child; under the condition that the connecting frame is in a locked state, the connecting frame is fixed relative to the bone needle and the connecting rod, and the bone needle clamps and fixes the pelvis of the child from the two sides. The device can be adjusted to fit the body types of different children, and can stably clamp the fractured ends of the pelvis of the children.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a child pelvis external fixation device. Background Art

[0002] In the treatment of pelvic fractures in children, a fixed structure is usually installed outside the pelvis. The fixed structure clamps the pelvis from the front of the abdomen to ensure the stability of the pelvis and promote the growth and healing of the fractured part of the pelvis.

[0003] Currently, the external pelvic fixation devices used for children have relatively simple functions and cannot be adjusted according to patients of different body shapes. In addition, the structures are unstable and do not fit the anatomical characteristics of the pelvis, which affects children's daily lives. Utility Model Content

[0004] The utility model provides a child pelvis external fixation device, which is used to solve the problem that the structure of the pelvis external fixation device in the prior art is unstable and affects the daily life of children.

[0005] The utility model provides a child pelvis external fixation device, comprising: a bone pin, a connecting frame and a connecting rod;

[0006] The connecting frames are provided with two, and the two connecting frames are respectively arranged at two ends of the connecting rod and are rotatably connected to the two ends of the connecting rod;

[0007] The connecting frame is arranged in a polygonal shape, and one end of the connecting frame which is away from the connecting rod is rotatably connected to the bone needle;

[0008] The bone pins located at both ends of the connecting rod are used to be installed on both sides of the child's pelvis;

[0009] The connecting frame has a rotating state and a locking state;

[0010] When the connecting frame is in the rotating state, the connecting frame can rotate relative to the bone needle and the connecting rod to adjust the position of the bone needle relative to the child's pelvis;

[0011] When the connecting frame is in the locked state, the connecting frame is fixed relative to the bone pins and the connecting rods, and the bone pins clamp and fix the child's pelvis from both sides.

[0012] According to the child pelvis external fixation device provided by the utility model, the connecting rods are provided with two;

[0013] The two connecting rods are arranged in parallel, and both ends of the two connecting rods are connected to the connecting frame.

[0014] According to the utility model, a child pelvic external fixation device also includes: a first bone needle chuck and a second bone needle chuck;

[0015] The connecting frame is connected to the connecting rod via the first bone needle clamp, and the connecting frame is connected to the bone needle via the second bone needle clamp;

[0016] When the connecting frame is in the rotating state, the connecting rod and the connecting frame can rotate relative to the first bone needle chuck, and the connecting frame and the bone needle can rotate relative to the second bone needle chuck;

[0017] When the connecting frame is in the locked state, the connecting rod and the connecting frame can be fixed relative to the first bone needle clamp, and the connecting frame and the bone needle can be fixed relative to the second bone needle clamp.

[0018] According to a child pelvic external fixation device provided by the utility model, the first bone needle clamp comprises: a first rod, a first clamping portion and a second clamping portion;

[0019] The first rod is inserted through the first clamping portion and the second clamping portion, and the first clamping portion and the second clamping portion are rotatably connected;

[0020] The first clamping portion has a first clamping channel, and the second clamping portion has a second clamping channel. The first clamping channel is used to clamp the connecting rod, and the connecting rod is rotatably disposed in the first clamping channel. The second clamping channel is used to clamp the connecting frame, and the connecting frame is rotatably disposed in the second clamping channel.

[0021] When the connecting frame is in the rotating state, the first rod is in an unlocking state with respect to the first clamping portion and the second clamping portion;

[0022] When the connecting frame is in the locked state, the first rod is in a locking state with respect to the first clamping portion and the second clamping portion;

[0023] And / or, the second bone needle chuck comprises: a second rod, a third clamping portion and a fourth clamping portion;

[0024] The second rod is inserted through the third clamping portion and the fourth clamping portion, and the third clamping portion and the fourth clamping portion are rotatably connected;

[0025] The third clamping portion has a third clamping channel, the fourth clamping portion has a fourth clamping channel, and the third clamping channel is used to clamp the connection frame.

[0026] The connecting frame is rotatably arranged in the third clamping channel, the fourth clamping channel is used to clamp the bone needle, and the bone needle is rotatably arranged in the fourth clamping channel;

[0027] When the connecting frame is in the rotating state, the second rod is in an unlocking state with respect to the third clamping portion and the fourth clamping portion;

[0028] When the connecting frame is in the locked state, the second rod is in a locking state with respect to the third clamping portion and the fourth clamping portion.

[0029] According to a child pelvis external fixation device provided by the utility model, the first clamping part and the second clamping part are respectively provided with locking teeth on opposite sides thereof;

[0030] And / or, locking teeth are respectively provided on opposite sides of the third clamping portion and the fourth clamping portion.

[0031] According to the child pelvic external fixation device provided by the utility model, the first bone needle clamp further includes: a first spring;

[0032] The first spring is sleeved on the first rod and clamped between the first rod and the first clamping portion and between the first rod and the second clamping portion;

[0033] And / or, the second bone needle chuck further includes: a second spring;

[0034] The second spring is clamped between the second rod and the third clamping portion and the fourth clamping portion.

[0035] According to the child pelvis external fixation device provided by the utility model, the connecting frame is a rectangular frame.

[0036] According to the child pelvis external fixation device provided by the utility model, the rectangular frame is enclosed.

[0037] According to the child pelvis external fixation device provided by the utility model, the end of the bone needle deeply inserted into the pelvis is arranged in a spherical surface.

[0038] According to the child pelvic external fixation device provided by the utility model, a cutting edge is provided at one end of the bone needle penetrating into the pelvis;

[0039] The cutting edge is spirally arranged on the outer wall of the bone needle along the axial direction of the bone needle and intersects with the spherical surface of the end of the bone needle.

[0040] The child pelvis external fixation device provided by the utility model is connected with both sides of the connecting rod by setting a polygonal connecting frame, and the connecting frame and the two ends of the connecting rod are rotatably connected, and the connecting frame and the bone needle are rotatably connected. When the external fixation device is installed to the child pelvis, the external fixation device can be fitted to the child pelvis as much as possible by adjusting the angle between the connecting frame and the connecting rod, and adjusting the angle between the connecting frame and the bone needle; and after the installation and adjustment of the external fixation device and the child pelvis are completed, the connecting frame and the connecting rod, as well as the connecting frame and the bone needle are locked, so that the connecting frame, the connecting rod and the bone needle are all fixed, the external fixation device can be adjusted in the installed state, and can be locked and fixed after the installation is completed, and the switching of the two states meets the different requirements of installation and use, and can stably clamp the fracture ends of the child pelvis, which is more conducive to the healing of the fracture of the child pelvis. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 It is a three-dimensional structural schematic diagram of the child pelvis external fixation device provided by the utility model;

[0043] Figure 2 It is a three-dimensional structural schematic diagram of the first bone needle chuck provided by the utility model;

[0044] Figure 3 The utility model provides Figure 2 AA cross-sectional structural diagram;

[0045] Figure 4 The utility model provides Figure 2 BB cross-sectional structure diagram;

[0046] Figure 5 It is a three-dimensional structural schematic diagram of the second bone needle chuck provided by the utility model;

[0047] Figure 6 It is a three-dimensional structural schematic diagram of the bone needle provided by the utility model.

[0048] Reference numerals:

[0049] 1. Bone needle; 2. Connecting frame; 3. Connecting rod; 4. First bone needle chuck; 5. Second bone needle chuck; 11. Spherical surface; 12. Cutting edge; 41. First rod; 42. First clamping part; 43. Second clamping part; 44. First spring; 51. Second rod; 52. Third clamping part; 53. Fourth clamping part; 54. Second spring; 421. First clamping channel; 422. Locking tooth pattern; 431. Second clamping channel; 521. Third clamping channel; 531. Fourth clamping channel. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0051] Combine the following Figures 1 to 6 , the child pelvis external fixation device provided by the embodiment of the utility model is described in detail through specific embodiments and application scenarios.

[0052] In some embodiments, Figure 1 As shown, this embodiment provides a pediatric pelvic external fixation device, comprising: a bone pin 1, a connecting frame 2 and a connecting rod 3.

[0053] There are two connecting frames 2 , which are respectively arranged at two ends of the connecting rod 3 and are rotatably connected to the two ends of the connecting rod 3 .

[0054] The connecting frame 2 is arranged in a polygonal shape, and one end of the connecting frame 2 away from the connecting rod 3 is rotatably connected to the bone needle 1 .

[0055] The bone pins 1 located at both ends of the connecting rod 3 are used to be installed on both sides of the child's pelvis.

[0056] The connecting frame 2 has a rotated state and a locked state.

[0057] When the connecting frame 2 is in a rotating state, the connecting frame 2 can rotate relative to the bone needle 1 and the connecting rod 3 to adjust the position of the bone needle 1 relative to the child's pelvis.

[0058] When the connecting frame 2 is in a locked state, the connecting frame 2 is fixed relative to the bone needles 1 and the connecting rods 3, and the bone needles 1 clamp and fix the child's pelvis from both sides.

[0059] It can be understood that the connecting frame 2 is used to connect the connecting rod 3 and the bone needle 1. Since the connecting frame 2 is arranged in a polygonal shape, the two connecting frames 2 are placed at both ends of the connecting rod 3. When the external fixation device is fixed to the child's pelvis, it can better fit the child's body shape. The polygonal stable structure makes the connection between the connecting rod 3 and the bone needle 1 more stable, which is more conducive to the healing of the fracture site of the child's pelvis.

[0060] Specifically, in this embodiment, two bone needles 1 are provided on each connecting frame 2, and the two bone needles 1 fix one side of the child's pelvis. According to the size of the child's pelvis, the distance between the two bone needles 1 on the connecting frame 2 is adjusted to better fit the shape of the pelvis from one side, thereby better fixing the pelvis.

[0061] Since the connecting frame 2 is rotatably connected to the connecting rod 3, and the bone needle 1 is rotatably connected to the connecting frame 2, the relative angles between the connecting rod 3 and the connecting frame 2, and between the connecting frame 2 and the bone needle 1 can be appropriately adjusted. When the external fixation device is installed on the outside of the child's pelvis, the connecting frame 2 is in a rotating state. By rotating the connecting frame 2 and the connecting rod 3, as well as the bone needle 1 and the connecting frame 2, the external fixation device is more closely fitted to the child's pelvis to be fixed, so that the external fixation device can be specifically adjusted to different children's pelvises of different sizes to adapt to the pelvises of different children.

[0062] After the external fixation device and the child's pelvis are installed and adjusted, the connecting frame 2 is in a locked state, and the relative positions of the connecting frame 2, the connecting rod 3 and the bone needle 1 are fixed, so that the bone needle 1 can stably clamp and fix the child's pelvis from both sides.

[0063] Specifically, a universal joint can be used to connect the connecting rod 3 to the connecting frame 2, and the connecting frame 2 to the bone needle 1, and the rotational connection between the connecting rod 3 and the connecting frame 2, and the connecting frame 2 and the bone needle 1 can be achieved based on the rotational characteristics of the universal joint, and a locking device is provided next to the universal joint, which can lock the universal joint; or a gear structure can be used to connect the connecting rod 3 to the connecting frame 2, and the connecting frame 2 to the bone needle 1, and the rotational connection between the connecting rod 3 and the connecting frame 2, and the connecting frame 2 and the bone needle 1 can be achieved based on the meshing transmission of the gear structure, and a locking device is provided on the gear structure, which can lock the gear structure.

[0064] When installing the child's pelvic external fixation device to the child's pelvis, the connecting rod 3 is placed on the front side of the child's pelvis, that is, the front of the child. The bone needles 1 on both sides of the connecting rod 3 are respectively inserted into the pelvis from the sides of the child's pelvis to fix the fractured pelvis to promote the growth and recovery of the pelvis.

[0065] The child pelvis external fixation device provided by the utility model is connected with both sides of the connecting rod 3 by setting a polygonal connecting frame 2, and the two ends of the connecting frame 2 and the connecting rod 3 are rotatably connected, and the connecting frame 2 and the bone needle 1 are rotatably connected. When the external fixation device is installed on the child pelvis, the angle between the connecting frame 2 and the connecting rod 3, and the angle between the connecting frame 2 and the bone needle 1 can be adjusted to make the external fixation device fit the child pelvis as much as possible; and after the installation and adjustment of the external fixation device and the child pelvis are completed, the connecting frame 2 and the connecting rod 3, as well as the connecting frame 2 and the bone needle 1 are locked, so that the connecting frame 2, the connecting rod 3 and the bone needle 1 are all fixed, and the external fixation device can be adjusted in the installed state and can be locked and fixed after the installation is completed. The switching of the two states meets the different requirements of installation and use, and can stably clamp the fracture ends of the child pelvis, which is more conducive to the healing of the fracture of the child pelvis.

[0066] In some embodiments, Figure 1 As shown, in this embodiment, two connecting rods 3 are provided.

[0067] The two connecting rods 3 are arranged in parallel, and both ends of the two connecting rods 3 are connected to the connecting frame 2 .

[0068] It can be understood that in this embodiment, two connecting rods 3 are provided, so that there are two connection points between the connecting rods 3 and the connecting frames 2 at both ends, and the two connecting rods 3 are arranged in parallel, so that the two connecting frames 2 and the two connecting rods 3 form a stable wedge-shaped structure, which better fits the physiological structure of the child's pelvis and can clamp and fix the child's pelvis more stably.

[0069] In some embodiments, Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, this embodiment further includes: a first bone needle chuck 4 and a second bone needle chuck 5.

[0070] The connecting frame 2 is connected to the connecting rod 3 via the first bone needle clamp 4 , and the connecting frame 2 is connected to the bone needle 1 via the second bone needle clamp 5 .

[0071] When the connecting frame 2 is in a rotating state, the connecting rod 3 and the connecting frame 2 can rotate relative to the first bone needle clamp 4 , and the connecting frame 2 and the bone needle 1 can rotate relative to the second bone needle clamp 5 .

[0072] When the connecting frame 2 is in a locked state, the connecting rod 3 and the connecting frame 2 can be fixed relative to the first bone needle clamp 4 , and the connecting frame 2 and the bone needle 1 can be fixed relative to the second bone needle clamp 5 .

[0073] It is understandable that both the connecting rod 3 and the connecting frame 2 can be rotatably connected to the first bone needle clamp 4, and the first bone needle clamp 4 can also lock and fix the connecting rod 3 and the connecting frame 2; both the connecting frame 2 and the bone needle 1 can be rotatably connected to the second bone needle clamp 5, and the second bone needle clamp 5 can also lock and fix the connecting frame 2 and the bone needle 1. Based on the small size, compact structure and easy adjustment characteristics of the first bone needle clamp 4 and the second bone needle clamp 5, the effective connection between the connecting rod 3 and the connecting frame 2, and the connecting frame 2 and the bone needle 1 can be achieved, while ensuring that the fixing device is small in size and light in weight, which is beneficial to the fixation of the child's pelvis, will not cause excessive impact on the child's weight, and is beneficial to the child's daily activities and physical recovery.

[0074] In some embodiments, Figure 2 , Figure 3 and Figure 4 As shown, the first bone needle chuck 4 of this embodiment includes: a first rod 41 , a first clamping portion 42 and a second clamping portion 43 .

[0075] The first rod 41 passes through the first clamping portion 42 and the second clamping portion 43 , and the first clamping portion 42 and the second clamping portion 43 are rotatably connected.

[0076] The first clamping portion 42 has a first clamping channel 421, and the second clamping portion 43 has a second clamping channel 431. The first clamping channel 421 is used to clamp the connecting rod 3, and the connecting rod 3 is rotatably arranged in the first clamping channel. The second clamping channel is used to clamp the connecting frame 2, and the connecting frame 2 is rotatably arranged in the second clamping channel.

[0077] When the connecting frame 2 is in the rotating state, the first rod 41 is in the unlocking state with respect to the first clamping portion 42 and the second clamping portion 43 .

[0078] When the connecting frame 2 is in a locked state, the first rod 41 is in a locking state with respect to the first clamping portion 42 and the second clamping portion 43 .

[0079] It is understandable that the first rod 41 can be screwed relative to the first clamping portion 42 and the second clamping portion 43 to adjust the distance between the first clamping portion 42 and the second clamping portion 43 and the height of the first clamping channel and the second clamping channel.

[0080] When the first rod 41 is in an unlocked state, there is no tight abutment between the first rod 41 and the first clamping portion 42 and the second clamping portion 43, and there is a spacing between the first clamping portion 42 and the second clamping portion 43, so that the first clamping portion 42 and the second clamping portion 43 can rotate relative to each other, and the connecting rod 3 can rotate in the first clamping channel, and the connecting frame 2 can rotate in the second clamping channel.

[0081] When the first rod 41 is in a locked state, the first rod 41 and the first clamping portion 42 and the second clamping portion 43 are in tight contact with each other, and there is no space between the first clamping portion 42 and the second clamping portion 43, so that the first clamping portion 42 and the second clamping portion 43 are locked and fixed, and the connecting rod 3 is locked and fixed in the first clamping channel, and the connecting frame 2 is locked and fixed in the second clamping channel.

[0082] In this embodiment, a first rod 41, a first clamping portion 42 and a second clamping portion 43 are provided on the first bone needle chuck 4. Based on the locking and unlocking of the first clamping portion 42 and the second clamping portion 43 by the first rod 41, the connecting rod 3 and the connecting frame 2 can be adjusted and locked. The adjustment and locking operations are simple and easy to operate.

[0083] The first clamping channel 421 and the second clamping channel 431 are arranged vertically and spaced apart along the axial direction of the first rod 41 to ensure that the relative clamping position of the connecting rod 3 and the connecting frame 2 is stable and adjustable.

[0084] In some embodiments, Figure 5 As shown, the second bone needle chuck 5 of this embodiment includes: a second rod 51 , a third clamping portion 52 and a fourth clamping portion 53 .

[0085] The second rod 51 passes through the third clamping portion 52 and the fourth clamping portion 53 , and the third clamping portion 52 and the fourth clamping portion 53 are rotatably connected.

[0086] The third clamping part 52 has a third clamping channel 521, and the fourth clamping part 53 has a fourth clamping channel 531. The third clamping channel 521 is used to clamp the connecting frame 2, and the connecting frame 2 is rotatably disposed in the third clamping channel. The fourth clamping channel is used to clamp the bone needle 1, and the bone needle 1 is rotatably disposed in the fourth clamping channel.

[0087] When the connecting frame 2 is in the rotating state, the second rod 51 is in the unlocking state with respect to the third clamping portion 52 and the fourth clamping portion 53 .

[0088] When the connecting frame 2 is in the locked state, the second rod 51 is in a locking state with respect to the third clamping portion 52 and the fourth clamping portion 53 .

[0089] It is understandable that the second rod 51 can be screwed relative to the third clamping portion 52 and the fourth clamping portion 53 to adjust the distance between the third clamping portion 52 and the fourth clamping portion 53 and the height of the third clamping channel and the fourth clamping channel.

[0090] When the second rod 51 is in an unlocked state, there is no tight abutment between the second rod 51 and the third clamping part 52 and the fourth clamping part 53, and there is a distance between the third clamping part 52 and the fourth clamping part 53, so that the third clamping part 52 and the fourth clamping part 53 can rotate relative to each other, and the connecting frame 2 can rotate in the third clamping channel, and the bone needle 1 can rotate in the fourth clamping channel.

[0091] When the second rod 51 is in a locked state, the second rod 51 and the third clamping part 52 and the fourth clamping part 53 are in tight contact with each other, and there is no space between the third clamping part 52 and the fourth clamping part 53, so that the third clamping part 52 and the fourth clamping part 53 are locked and fixed, and the connecting frame 2 is locked and fixed in the third clamping channel, and the bone needle 1 is locked and fixed in the fourth clamping channel.

[0092] In this embodiment, a second rod 51, a third clamping part 52, and a fourth clamping part 53 are provided on the second bone needle chuck 5. Based on the locking and unlocking of the third clamping part 52 and the fourth clamping part 53 by the second rod 51, the connecting frame 2 and the bone needle 1 can be adjusted and locked. The adjustment and locking operations are simple and easy to operate.

[0093] The third clamping channel 521 and the fourth clamping channel 531 are arranged vertically and spaced apart along the axial direction of the second rod 51 to ensure that the relative clamping position of the connecting frame 2 and the bone needle 1 is stable and adjustable.

[0094] In some embodiments, Figure 2 and Figure 4 As shown, locking teeth 422 are respectively disposed on opposite sides of the first clamping portion 42 and the second clamping portion 43 of this embodiment.

[0095] It can be understood that in order to make the first clamping part 42 and the second clamping part 43 have a better fixing effect when the first rod 41 locks the first clamping part 42 and the second clamping part 43, the present embodiment is respectively provided with locking teeth 422 on the opposite sides of the first clamping part 42 and the second clamping part 43. When the first clamping part 42 and the second clamping part 43 abut against the first rod 41 in the axial direction, the locking teeth 422 locks the relative movement of the first clamping part 42 and the second clamping part 43, that is, the relative rotation between the connecting rod 3 and the connecting frame 2 is locked. When the first clamping part 42 and the second clamping part 43 are separated in the axial direction of the first rod body, the first clamping part 42 and the second clamping part 43 are in a state of relative rotation, and the connecting rod 3 and the connecting frame 2 can rotate relative to each other. By setting the locking teeth 422, the present embodiment can further limit the relative rotation of the connecting rod 3 and the connecting frame 2, so that the fixing and locking effect of the connecting rod 3 and the connecting frame 2 is better.

[0096] In some embodiments, Figure 5As shown, the opposite sides of the third clamping portion 52 and the fourth clamping portion 53 of this embodiment are respectively provided with locking teeth.

[0097] It can be understood that in order to make the third clamping part 52 and the fourth clamping part 53 have a better fixing effect when the second rod 51 locks the third clamping part 52 and the fourth clamping part 53, the present embodiment provides locking teeth on the opposite sides of the third clamping part 52 and the fourth clamping part 53 respectively. When the third clamping part 52 and the fourth clamping part 53 abut in the axial direction of the second rod 51, the locking teeth lock the relative movement of the third clamping part 52 and the fourth clamping part 53, that is, the relative rotation between the connecting frame 2 and the bone needle 1 is locked. When the third clamping part 52 and the fourth clamping part 53 are separated in the axial direction of the second rod body, the third clamping part 52 and the fourth clamping part 53 are in a state of relative rotation, and the connecting frame 2 and the bone needle 1 can rotate relative to each other. By providing the locking teeth, the present embodiment can further limit the relative rotation of the connecting frame 2 and the bone needle 1, so that the fixing and locking effect of the connecting frame 2 and the bone needle 1 is better.

[0098] In some embodiments, Figure 2 , Figure 3 and Figure 4 As shown, the first bone needle chuck 4 of this embodiment further includes: a first spring 44 .

[0099] The first spring 44 is sleeved on the first rod 41 , and is clamped between the first rod 41 and the first clamping portion 42 , and between the first rod 41 and the second clamping portion 43 .

[0100] It can be understood that when the first clamping portion 42 and the second clamping portion 43 rotate relative to the first rod 41, the axes of the first clamping portion 42 and the second clamping portion 43 deviate from the axis of the first rod 41, and the first spring 44 located between the first clamping portion 42, the second clamping portion 43 and the first rod 41 is compressed. The elastic force of the first spring 44 generates a reaction force on the first clamping portion 42 and the second clamping portion 43, so that the first clamping portion 42, the second clamping portion 43 and the first rod 41 restore the coaxial rotation. In addition, the first spring 44 can also absorb the impact force between the first clamping portion 42, the second clamping portion 43 and the first rod 41, reduce the damage to the first clamping portion 42, the second clamping portion 43 and the first rod 41, and improve the stability and reliability of the first clamping portion 42, the second clamping portion 43 and the first rod 41.

[0101] In some embodiments, Figure 5 As shown, the second bone needle chuck 5 of this embodiment further includes: a second spring 54 .

[0102] The second spring 54 is sandwiched between the second rod 51 and the third clamping portion 52 and the fourth clamping portion 53 .

[0103] It is understandable that when the third clamping part 52 and the fourth clamping part 53 rotate relative to the second rod 51, the axes of the third clamping part 52 and the fourth clamping part 53 deviate from the axis of the second rod 51, and the second spring 54 located between the third clamping part 52, the fourth clamping part 53 and the second rod 51 is compressed. The elastic force of the second spring 54 generates a reaction force on the third clamping part 52 and the fourth clamping part 53, so that the third clamping part 52, the fourth clamping part 53 and the second rod 51 restore the coaxial rotation. In addition, the second spring 54 can also absorb the impact force between the third clamping part 52, the fourth clamping part 53 and the second rod 51, reduce the damage to the third clamping part 52, the fourth clamping part 53 and the second rod 51, and improve the stability and reliability of the third clamping part 52, the fourth clamping part 53 and the second rod 51.

[0104] In some embodiments, Figure 1 As shown, the connection frame 2 of this embodiment is a rectangular frame.

[0105] It is understandable that when the frame of the connecting frame is set as a rectangular frame, the first bone needle chuck 4 and the second bone needle chuck 5 can be installed on the long sides of the rectangle respectively, and the two connecting rods 3 and the rectangular frames on both sides form a stable structure, which is more conducive to clamping the bone needle 1.

[0106] In some embodiments, Figure 1 As shown, the rectangular frame of this embodiment is formed by enclosing round steel.

[0107] It is understandable that the rectangular frame enclosed by round steel is a solid structure, which makes the structure of the rectangular frame more solid and less prone to deformation. At the same time, the round steel structure is easier to be clamped by the second clamping channel 431 and the third clamping channel 521. Compared with the structure with edges, the clamping surfaces of the round steel and the second clamping channel 431 and the third clamping channel 521 are in smooth contact and can roll relative to each other, thereby reducing the friction force during the relative rotation of the connecting frame 2 and the connecting rod 3 and the bone needle 1, which is beneficial to the stability and adjustment of the fixing device.

[0108] In some embodiments, Figure 6 As shown, the end of the bone needle 1 of this embodiment that penetrates into the pelvis is arranged in a spherical surface 11.

[0109] It is understandable that the end of the bone needle 1 of the present embodiment is spherically arranged. During the process of implanting the bone needle 1 into the child's pelvis, the contact surface of the bone needle 1 penetrating into the pelvis is a spherical contact surface, and the bone needle 1 moves accordingly. The spherical contact surface can ensure that when the bone needle 1 moves in the pelvis, it will slip and change direction when encountering inclined cortical bone, and will not directly penetrate the cortical bone, nor cause damage to the pelvic internal organs. By setting the end of the bone needle 1 to a spherical surface 11, the present embodiment avoids the bone needle 1 from penetrating the cortical bone during the implantation process of the bone needle 1, and further avoids the bone needle 1 from damaging the pelvic internal organs.

[0110] In some embodiments, Figure 6 As shown, the end of the bone needle 1 of this embodiment that penetrates into the pelvis is provided with a cutting edge 12.

[0111] The cutting edge 12 is spirally arranged on the outer wall of the bone needle 1 along the axial direction of the bone needle 1 , and intersects with the spherical surface 11 at the end of the bone needle 1 .

[0112] It can be understood that the side wall of one end of the bone needle 1 that penetrates into the pelvis is provided with a usual external thread structure, and a cutting edge 12 is provided at the top of the bone needle 1. When the bone needle 1 is implanted into the pelvis, a hole is first drilled using a drill bit with an outer diameter smaller than that of the bone needle 1, and then the bone needle 1 is implanted from the hole. The cutting edge 12 is used to avoid bone chips generated when the bone needle 1 is implanted into the pelvis, and the bone chips are guided out through the cutting edge 12 to avoid the accumulation of bone chips at the top when the bone needle 1 is implanted into the pelvis, which is more conducive to the implantation of the bone needle 1 relative to the pelvis.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A pediatric pelvic external fixation device, characterized in that: include: bone pins, connecting frames and connecting rods; The connecting frames are provided with two, and the two connecting frames are respectively arranged at two ends of the connecting rod and are rotatably connected to the two ends of the connecting rod; The connecting frame is arranged in a polygonal shape, and one end of the connecting frame which is away from the connecting rod is rotatably connected to the bone needle; The bone pins located at both ends of the connecting rod are used to be installed on both sides of the child's pelvis; The connecting frame has a rotating state and a locking state; When the connecting frame is in the rotating state, the connecting frame can rotate relative to the bone needle and the connecting rod to adjust the position of the bone needle relative to the child's pelvis; When the connecting frame is in the locked state, the connecting frame is fixed relative to the bone pins and the connecting rods, and the bone pins clamp and fix the child's pelvis from both sides.

2. The child pelvis external fixation device according to claim 1, characterized in that: The connecting rods are provided with two; The two connecting rods are arranged in parallel, and both ends of the two connecting rods are connected to the connecting frame.

3. The child pelvis external fixation device according to claim 2, characterized in that: Also includes: a first bone needle chuck and a second bone needle chuck; The connecting frame is connected to the connecting rod via the first bone needle clamp, and the connecting frame is connected to the bone needle via the second bone needle clamp; When the connecting frame is in the rotating state, the connecting rod and the connecting frame can rotate relative to the first bone needle chuck, and the connecting frame and the bone needle can rotate relative to the second bone needle chuck; When the connecting frame is in the locked state, the connecting rod and the connecting frame can be fixed relative to the first bone needle clamp, and the connecting frame and the bone needle can be fixed relative to the second bone needle clamp.

4. The child pelvis external fixation device according to claim 3, characterized in that: The first bone needle chuck comprises: a first rod, a first clamping portion and a second clamping portion; The first rod is inserted through the first clamping portion and the second clamping portion, and the first clamping portion and the second clamping portion are rotatably connected; The first clamping portion has a first clamping channel, and the second clamping portion has a second clamping channel. The first clamping channel is used to clamp the connecting rod, and the connecting rod is rotatably disposed in the first clamping channel. The second clamping channel is used to clamp the connecting frame, and the connecting frame is rotatably disposed in the second clamping channel. When the connecting frame is in the rotating state, the first rod is in an unlocking state with respect to the first clamping portion and the second clamping portion; When the connecting frame is in the locked state, the first rod is in a locking state with respect to the first clamping portion and the second clamping portion; And / or, the second bone needle chuck comprises: a second rod, a third clamping portion and a fourth clamping portion; The second rod is inserted through the third clamping portion and the fourth clamping portion, and the third clamping portion and the fourth clamping portion are rotatably connected; The third clamping portion has a third clamping channel, and the fourth clamping portion has a fourth clamping channel. The third clamping channel is used to clamp the connecting frame, and the connecting frame is rotatably disposed in the third clamping channel. The fourth clamping channel is used to clamp the bone needle, and the bone needle is rotatably disposed in the fourth clamping channel. When the connecting frame is in the rotating state, the second rod is in an unlocking state with respect to the third clamping portion and the fourth clamping portion; When the connecting frame is in the locked state, the second rod is in a locking state with respect to the third clamping portion and the fourth clamping portion.

5. The child pelvis external fixation device according to claim 4, characterized in that: The first clamping portion and the second clamping portion are respectively provided with locking teeth on opposite sides thereof; And / or, locking teeth are respectively provided on opposite sides of the third clamping portion and the fourth clamping portion.

6. The child pelvis external fixation device according to claim 5, characterized in that: The first bone needle chuck further includes: a first spring; The first spring is sleeved on the first rod and clamped between the first rod and the first clamping portion and between the first rod and the second clamping portion; And / or, the second bone needle chuck further includes: a second spring; The second spring is clamped between the second rod and the third clamping portion and the fourth clamping portion.

7. The child pelvis external fixation device according to claim 1, characterized in that: The connecting frame is a rectangular frame.

8. The child pelvis external fixation device according to claim 7, characterized in that: The rectangular frame is formed by enclosing round steel.

9. The child pelvis external fixation device according to claim 1, characterized in that: The end of the bone needle that penetrates into the pelvis is arranged in a spherical surface.

10. The child pelvis external fixation device according to claim 9, characterized in that: One end of the bone needle that penetrates into the pelvis is provided with a cutting edge; The cutting edge is spirally arranged on the outer wall of the bone needle along the axial direction of the bone needle and intersects with the spherical surface of the end of the bone needle.

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