Fixing needle
By setting an expansion section on the fixation needle and using an expansion mechanism to drive its radial protrusion, the problem of unstable fixation on bones by traditional fixation needles is solved, achieving a more stable fixation effect and a simplified operation process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2026-03-17
AI Technical Summary
Traditional fixation pins are unstable on the bone, easily loosening and shifting. They are also complex to operate and may cause uneven stress distribution around the bone, affecting treatment outcomes and increasing patient suffering.
A fixation needle was designed, comprising a fixation component and an expansion mechanism. The fixation needle tip has a tip and an expansion portion. The expansion portion is driven to protrude radially by the expansion mechanism, increasing the contact area with the bone and ensuring tight fixation.
It effectively solves the problem of fixation pin slippage and detachment, improves fixation stability and reliability, reduces operational complexity, and avoids bone damage.
Smart Images
Figure CN223994968U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of medical devices, specifically to a fixation needle. Background Technology
[0002] In orthopedic surgery, it is necessary to fix targets to the bone using fixation pins, such as tracking frames used for positioning and navigation. Some traditional fixation pins have simple structures but poor stability after fixation, and are prone to loosening and displacement. This not only affects the treatment outcome but may also increase patient suffering and medical costs. Other traditional fixation pins use a fixed shape and achieve fixation by screwing or pressing into the bone base. However, this method often requires applying significant stress to ensure the pin is firmly fixed in the bone. This not only increases the complexity of the procedure but may also lead to uneven stress distribution around the bone, affecting the fixation effect. Therefore, there is an urgent need for a new type of fixation pin to solve these problems. Summary of the Invention
[0003] This disclosure provides a fixation pin that solves the problem of unstable fixation and easy damage to bones in the prior art.
[0004] This disclosure provides a fixation pin for fixing a target object to a target bone, including:
[0005] The fixation assembly includes a fixation needle and an expansion mechanism. The fixation needle includes a tip and an expansion portion. The tip is used to insert into the target bone, and the expansion portion can protrude radially relative to the fixation needle under the drive of the expansion mechanism.
[0006] The connecting rod has one end for connecting to the object being fixed and the other end for connecting to the fixing component.
[0007] According to the aforementioned embodiments, in a first possible implementation, the expansion mechanism is disposed between the fixed needle and the connecting rod.
[0008] According to the aforementioned embodiments, in a second possible implementation, the expansion mechanism includes an expansion pin and a cam, and the rotation of the cam can drive the expansion pin to move axially.
[0009] According to the aforementioned embodiments, in a third possible implementation, the fixed needle is hollow inside, the expansion part is a paddle arranged along the axial direction of the fixed needle, the first end of the expansion part is fixedly connected to the fixed needle, and the second end of the expansion part can move radially relative to the fixed needle.
[0010] According to the aforementioned embodiments, in a fourth possible implementation, the expansion mechanism further includes a housing, a cam located inside the housing, one end of the expansion pin contacting the cam, and the other end located inside the fixing needle extending to the second end of the expansion portion.
[0011] According to the aforementioned embodiments, in the fifth possible implementation, the end of the expansion pin is provided with a conical surface, and the end of the expansion portion is provided with a conical shape that matches the end of the expansion pin.
[0012] According to the aforementioned embodiments, in a sixth possible implementation, the expansion mechanism further includes a spring disposed between the bottom of the housing and one end of the expansion pin.
[0013] According to the aforementioned embodiments, in the seventh possible implementation, the housing is a cone shape with a profile larger than that of the fixed needle.
[0014] According to the aforementioned embodiments, in the eighth possible implementation, the number of expansion portions is multiple and they are evenly arranged circumferentially on the fixed needle.
[0015] According to the aforementioned embodiments, in the ninth possible implementation, the fixed needle is hollow inside, and the expansion part is a ball provided on the side wall of the fixed needle. The ball can protrude from the side wall of the fixed needle under the drive of the expansion mechanism. Beneficial effects
[0016] The fixation pin disclosed herein includes a fixation component and a connecting rod. The fixation component includes a fixation pin tip and an expansion mechanism. The fixation pin tip includes a tip and an expansion portion. The tip is used for insertion into the target bone, and the expansion portion can deform radially relative to the fixation pin tip under the drive of the expansion mechanism. One end of the connecting rod is used to connect to the object being fixed, and the other end is connected to the fixation component. By providing an expansion portion in the fixation pin tip and using the expansion mechanism to drive the expansion portion to protrude radially, the contact area between the fixation pin tip and the bone is increased. This design effectively solves the problem of traditional fixation pins easily slipping and falling off during fixation, ensuring a tight fixation between the pin and the bone, and improving the stability and reliability of the fixation. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the fixing pin structure according to an embodiment of the present disclosure. Figure 1 ;
[0018] Figure 2 This is a schematic diagram of the fixing pin structure according to an embodiment of the present disclosure. Figure 2 ;
[0019] Figure 3 This is a cross-sectional view of the fixing pin structure according to an embodiment of the present disclosure;
[0020] Figure 4 This is a cross-sectional view of the structure at the fixed needle expansion mechanism according to an embodiment of this disclosure;
[0021] Figure 5 This is a schematic diagram of the fixed needle expansion mechanism according to an embodiment of the present disclosure;
[0022] Figure 6This is a schematic diagram of the fixed needle structure according to an embodiment of the present disclosure;
[0023] Figure 7a This is an enlarged view of the fixed needle structure according to an embodiment of the present disclosure;
[0024] Figure 7b This is a schematic diagram of the expansion section and the end structure of the expansion pin in an embodiment of this disclosure;
[0025] Figure 8 This is a schematic diagram of a second type of fixing pin structure according to an embodiment of the present disclosure;
[0026] Figure 9 This is a cross-sectional view of a second type of fixing pin structure according to an embodiment of this disclosure;
[0027] Figure 10 This is a schematic diagram of the expansion portion of the second type of fixing pin structure according to an embodiment of the present disclosure;
[0028] Figure 11 This is a schematic diagram of the structure of the plugging and unplugging tool installed in the plugging and unplugging interface according to an embodiment of the present disclosure;
[0029] Reference numerals: 1-connecting rod, 2, 2a-fixed needle, 201-tip, 202, 202a-expansion part, 2021-first end, 2022-second end, 2023-through hole, 3, 3a-expansion mechanism, 301, 301a-expansion pin, 3011-first section, 3012-second section, 3013-slanted groove, 302, 302a-cam, 303-housing, 304-camshaft, 305-handle, 306-spring, 4-insertion / removal tool, 401-holding part, 402-striking part, 5-insertion / removal interface. Detailed Implementation
[0030] The features and exemplary embodiments of various aspects of this disclosure will now be described in detail. To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, will provide a further detailed description. It should be understood that the specific embodiments described herein are intended to explain this disclosure only and not to limit it. For those skilled in the art, this disclosure can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this disclosure by illustrating examples.
[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.
[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other. The embodiments will now be described in detail with reference to the accompanying drawings.
[0033] The fixing pins proposed in this disclosure, such as Figure 1-3 As shown, it includes a fixing component and a connecting rod 1. The fixing component includes a fixing needle 2 and an expansion mechanism 3. The fixing needle 2 includes a tip 201 and an expansion portion 202. The tip 201 is used to insert into the target bone, and the expansion portion 202 can protrude radially relative to the fixing needle 2 under the drive of the expansion mechanism 3. One end of the connecting rod 1 is used to connect to the object being fixed, and the other end is connected to the fixing component.
[0034] In orthopedic surgery, target objects are fixed to the bone using fixation pins. For example, in navigation-assisted orthopedic surgery, a tracking device for positioning and navigation is fixed to the bone using fixation pins. One end of the pin is connected to the tracking device, and the other end is fixedly connected to the bone. When the tracking device is fixed by the pins, an expansion portion 202 is provided at the pin tip, and an expansion mechanism 3 drives the expansion portion 202 to deform radially, thereby increasing the contact area between the pin tip 2 and the bone. This design effectively solves the problem of traditional fixation pins easily slipping and falling off during fixation, ensuring a tight fixation between the pin and the bone, and improving the stability and reliability of the fixation.
[0035] In one optional embodiment, the fixed needle 2 is hollow inside, and the expansion portion 202 is a lever arranged along the axial direction of the fixed needle 2. The first end 2021 of the expansion portion 202 is fixedly connected to the fixed needle 2, and the second end 2022 of the expansion portion 202 can move radially relative to the fixed needle 2. The expansion portion 202 has deformation recovery capability. Specifically, as shown... Figure 6As shown, the pry bar is long and narrow, with one end connected to the fixing needle 2 and the other end suspended. When the fixing needle is inserted into the target bone, the tip of the fixing needle 2 enters the bone first. At this time, the expansion mechanism 3 does not act on the expansion part 202, and the expansion part 202 does not protrude from the fixing needle 2 and enters the target bone along with the tip. After the expansion part 202 enters the target bone, the expansion mechanism 3 acts on the expansion part 202. The suspended end of the expansion part 202 deforms and protrudes radially outward relative to the fixing needle 2. The protruding expansion part 202 interacts with the target bone, making the fixing needle firmly fixed and difficult to loosen. When it is necessary to remove the fixing needle, the expansion mechanism 3 is driven in the reverse direction. The expansion part 202 loses the effect of the expansion mechanism 3 and can return to its undeformed state, allowing the fixing needle to be pulled out freely.
[0036] In one optional embodiment, the number of expansion portions 202 is multiple and they are evenly distributed circumferentially on the fixed needle head 2. Specifically, as shown... Figure 6 As shown in Figure 7, there are three expansion portions 202, which are circumferentially distributed around the fixing needle 2. In some alternative embodiments, to ensure uniform force distribution during fixing, the number of expansion portions 202 can be two, four, five, etc., which is not specifically limited here.
[0037] In one optional embodiment, the expansion mechanism 3 is disposed between the fixed needle 2 and the connecting rod 1. The expansion mechanism 3 includes an expansion pin 301 and a cam 302, the rotation of which drives the expansion pin 301 to move axially. The expansion mechanism 3 also includes a housing 303, the cam 302 is located inside the housing 303, one end of the expansion pin 301 contacts the cam 302, and the other end extends inside the fixed needle 2 to the second end 2022 of the expansion portion 202.
[0038] Specifically, such as Figure 1-4 As shown, the outer diameter of the housing 303 of the expansion mechanism 3 protrudes beyond the outer diameter of the connecting rod 1 and the fixed needle 2. A cam 302 and a camshaft 304 are disposed within the housing 303. The cam 302 is adjacent to one end of the expansion pin 301. The expansion pin 301 includes a first segment 3011 and a second segment 3012. The radial dimension of the first segment 3011 is larger than that of the second segment 3012. The first segment 3011 is adjacent to the cam 302, and the second segment 3012 extends from the housing 303 into the interior of the fixed needle 2. Furthermore, the camshaft 304 is rotatably connected to the housing 303. A handle 305 is also provided on the camshaft 304 extending outside the housing 303, allowing the cam 302 to rotate by rotating the handle 305.
[0039] In one alternative implementation, such as Figure 4-5As shown, the expansion mechanism 3 also includes a spring 306, which is disposed between the bottom of the housing 303 and one end of the expansion pin 301. Specifically, the spring 306 is sleeved on the expansion pin 301, with one end of the spring 306 abutting against the first segment 3011 of the expansion pin 301, and the other end abutting against the bottom of the housing 303. It is easy to understand that, through the provision of the spring 306, when it is necessary to release the deformation of the expansion part 202 and remove the fixing pin, the unlocking cam 302 is activated, and the expansion pin 301 automatically resets under the action of the spring 306, restoring the deformation of the expansion part 202, allowing the fixing pin to be easily pulled out.
[0040] In one alternative implementation, such as Figure 1-4 As shown, the housing 303 is tapered with a profile larger than that of the fixed needle 2. It is easy to understand that the outer diameter of the housing 303 of the expansion mechanism 3 protrudes beyond the outer diameter of the connecting rod 1 and the fixed needle 2. On the one hand, this provides space for the structure of the cam 302 and the expansion pin 301. On the other hand, the increased outer diameter from the fixed needle 2 can prevent the fixed needle from penetrating too deeply into the bone and causing harm to the patient.
[0041] In one alternative implementation, such as Figures 7a-7b As shown, the end of the expansion pin 301 is provided with a conical surface, and the end of the expansion part 202 is provided with a conical shape that matches the end of the expansion pin 301. It is easy to understand that the conical surface of the ends of the expansion pin 301 and the expansion part 202 allows the expansion pin 301 to smoothly push the expansion part 202 when it moves axially, so that the expansion part 202 protrudes from the fixed needle.
[0042] In one alternative embodiment, the fixing needle 2 includes a plurality of blade tips 203 arranged circumferentially along the fixing needle 2, and an expansion portion 202 is disposed between the blade tips 203. It is readily understood that the arrangement of the blade tips 203 of the fixing needle 2 makes it easier for the fixing needle to enter the bone and form circumferential fixation, avoiding circumferential rotation of the fixing pin.
[0043] In one alternative implementation, such as Figure 8-10 As shown, the fixed needle 2a is hollow inside, and the expansion part 202a is a ball bearing disposed on the side wall of the fixed needle 2a. The ball bearing can protrude from the side wall of the fixed needle 2a under the drive of the expansion mechanism 3a. Specifically, in this embodiment, the side wall of the fixed needle 2a is provided with a through hole 2023. The diameter of the through hole 2023 near the outer side is smaller than the diameter near the inner side. A ball bearing is disposed in the through hole 2023, and the diameter of the ball bearing is larger than the diameter of the through hole 2023 near the outer side.
[0044] In this embodiment, the expansion mechanism 3a includes an expansion pin 301a and a cam 302a. Its general principle is largely the same as in the previous embodiments and will not be repeated here. The difference from the previous embodiments is that the expansion pin 301a is provided with a groove 3013. The groove 3013 is used to accommodate or compress the ball. The groove 3013 has a certain angle with the axial direction of the expansion pin 301a, and has an inclined surface for pushing the ball. When the expansion pin 301a is driven axially by the cam to achieve a stable installation of the fixing pin, the inclined surface of the groove 3013 pushes the ball outwards beyond the side wall of the fixing needle 2a. It is easy to understand that the protrusion of the ball enhances contact with the target bone, thus strengthening the stability of the fixing needle.
[0045] In one alternative implementation, such as Figure 1 As shown, the connecting rod 1 of the fixing pin is provided with a plug-in interface 5, which is located at the end of the connecting rod 1 away from the fixing pin head 2. Specifically, the plug-in interface 5 is a through hole that radially penetrates the connecting rod 1, and is used to install a plug-in / plug-out tool for the fixing pin. Figure 11 As shown, an example of a plugging / unplugging tool 4 being installed on a plugging / unplugging interface 5 is given. The plugging / unplugging tool 4 is a rod, including a holding section 401 and a striking section 402. The diameter of the striking section 402 matches the diameter of the hole in the plugging / unplugging interface 5, and the diameter of the holding section 401 is larger than the diameter of the hole in the plugging / unplugging interface 5.
[0046] When it is necessary to insert or remove the fixation pin, i.e., to install or remove the fixation pin on the target bone, the striking section 402 is inserted into the insertion / removal interface 5. Holding the handle section 401, a hammer or other tool is used to strike the striking section 402 extending from the insertion / removal interface 5. When the hammer strikes with a force F directed towards the fixation pin head 2, the fixation pin can be installed into the target bone; when the strikes with a force F directed in the opposite direction to the fixation pin head 2, the fixation pin can be removed from the target bone. Through the above implementation method, convenient installation and removal of the fixation pin during use is achieved.
[0047] Although this disclosure has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, such modifications or improvements made without departing from the spirit of this disclosure are all within the scope of protection claimed by this disclosure.
Claims
1. A fixation pin for fixing a target object to a target bone, characterized in that, The application relates to a fixing assembly for fixing a target object to a target bone, comprising: a fixing needle, which comprises a tip and an expansion part, wherein the tip is used for inserting into the target bone, and the expansion part can be radially protruded relative to the fixing needle under the driving of an expansion mechanism; and a connecting rod, one end of which is used for connecting the target object, and the other end of which is connected with the fixing assembly. The expansion mechanism is arranged between the fixing needle and the connecting rod. The expansion mechanism comprises an expansion pin and a cam, and the rotation of the cam can drive the expansion pin to move axially.
2. The fixed needle of claim 1, wherein The fixing needle is hollow, the expansion part is a tab arranged axially along the fixing needle, the first end of the expansion part is fixedly connected with the fixing needle, and the second end of the expansion part can be radially moved relative to the fixing needle.
3. The fixed needle of claim 1, wherein The expansion mechanism further comprises a shell, the cam is arranged in the shell, one end of the expansion pin is in contact with the cam, and the other end of the expansion pin extends into the second end of the expansion part in the fixing needle.
4. The fixed needle of claim 3, wherein The end of the expansion pin is provided with a taper, and the end of the expansion part is provided with a taper matched with the end of the expansion pin.
5. The fixed needle of claim 4, wherein, The expansion mechanism further comprises a spring, which is arranged between the bottom of the shell and one end of the expansion pin.
6. The fixed needle of claim 5, wherein The shell is a taper with a larger profile than the fixing needle.
7. The fixed needle of claim 5 wherein, The number of the expansion parts is multiple, and the expansion parts are uniformly arranged circumferentially on the fixing needle.
8. The fixed needle of claim 7, wherein, The fixing needle is hollow, the expansion part is a ball arranged on the side wall of the fixing needle, and the ball can be protruded from the side wall of the fixing needle under the driving of the expansion mechanism.
9. The fixed needle of claim 1, wherein 10. The fixed needle of claim 1 wherein,