CN218500793U - Bone implant - Google Patents
Bone implant Download PDFInfo
- Publication number
- CN218500793U CN218500793U CN202221650651.1U CN202221650651U CN218500793U CN 218500793 U CN218500793 U CN 218500793U CN 202221650651 U CN202221650651 U CN 202221650651U CN 218500793 U CN218500793 U CN 218500793U
- Authority
- CN
- China
- Prior art keywords
- cutting edge
- bone implant
- bone
- post
- distal end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Surgical Instruments (AREA)
Abstract
The present application relates to a bone implant. A bone implant includes a post extending from a proximal end to a distal end, the post being externally threaded and configured for threaded engagement with a bone. Wherein the distal end of the post has a radial dimension greater than the proximal end of the post. The distal end of the post body also has at least one cutting edge structure formed on the external thread, the cutting edge structure being configured to form a cutting force in a rotational direction on the bone during screwing. The screwing resistance of the head of the bone implant can be reduced, the overlarge screwing resistance formed at the far end of the column body is avoided, and the occurrence probability of hazards such as slipping or breaking of the bone implant, increase of operation time and difficulty, displacement of a fracture block and the like can be effectively reduced.
Description
Technical Field
The present application relates to the field of medical device technology, and more particularly to a bone implant.
Background
Bone implants include headless compression tacks, which are commonly used for fixation of fractures or fragments of ossicles, as well as for arthrodesis, fracture repair or osteotomies of the clavicles, humerus, radius, ulna, ilium, femur, patella, fibula, tibia, talus, ankle and calcaneus.
However, when screwing in the conventional bone implant such as the headless pressurized hollow nail, the bone at the position to be operated needs to be spread, and the problem of labor-consuming head screwing exists, which easily causes the injuries such as slipping or breaking of the bone implant, increase of operation time and difficulty, displacement of fracture blocks and the like.
SUMMERY OF THE UTILITY MODEL
Based on this, it is necessary to provide a bone implant to reduce the screwing resistance and reduce the occurrence probability of the hazards of slipping or breaking of the bone implant, increase of operation time and difficulty, displacement of the fracture block, and the like, aiming at the problem that the head of the traditional bone implant is hard to screw in.
A bone implant is provided that includes a post extending from a proximal end to a distal end, the post having external threads thereon and configured for threaded engagement with a bone. Wherein the distal end of the post has a radial dimension greater than the radial dimension of the proximal end of the post. The distal end of the post body also has at least one cutting edge structure formed on the external thread, the cutting edge structure being configured to form a cutting force in a rotational direction on the bone during screwing.
In one embodiment, the cutting edge structure comprises a plurality of cutting edge parts formed on a plurality of screw teeth of the external screw thread, and the cutting edge parts correspond to the screw teeth one by one.
In one embodiment, the cutting edge portion is configured as a notch formed on the thread.
In one embodiment, the cross-sectional shape of the blade portion is arc-shaped, polygonal or L-shaped; wherein the cross section of the cutting edge part is parallel to the radial direction of the cutting edge part.
In one embodiment, each of the cutting edge portions includes a first cutting edge surface and a second cutting edge surface disposed at an included angle α and intersecting at a first intersection line.
In one embodiment, the included angle α between the first cutting edge surface and the second cutting edge surface satisfies the condition: alpha is more than or equal to 70 degrees and less than or equal to 110 degrees.
In one embodiment, a plane passing through the central axis of the cylinder and parallel to the first cutting edge surface is defined as a first plane, and the first cutting edge surface has a preset interval D with the first plane along the rotation direction.
In one embodiment, a plane passing through the outer edge of the first land surface and the central axis of the cylinder is defined as a second plane, and the first land surface and the second plane are arranged at an acute angle β, which satisfies the condition: beta is more than or equal to 0 degree and less than or equal to 20 degrees.
In one embodiment, the cutting edge portion closest to the distal end is a first cutting edge portion, the cutting edge portion closest to the proximal end is a second cutting edge portion, and a first intersection line of the first cutting edge portion and the second cutting edge portion is configured as an arc line formed by inward recess relative to the external thread.
In one embodiment, an included angle γ is formed between a first boundary line corresponding to the cutting edge portion between the first cutting edge portion and the second cutting edge portion and the central axis of the cylinder, and the included angle γ satisfies the condition: gamma is more than or equal to 1 degree and less than or equal to 10 degrees.
In one embodiment, the cutting edge has a proximal edge and a distal edge that are oppositely disposed along the axial direction of the post, and the proximal edge is closer to the central axis of the post than the distal edge.
In one embodiment, the external thread comprises a distal region close to the distal end of the cylinder, the cutting edge structure is arranged on the thread of the distal region, and the size of the distal region in the central axis direction of the cylinder is L 1 The dimension of the cutting edge structure in the central axis direction of the column body is L 2 ，L 1 And L 2 The following relationship is satisfied: l is more than 2mm 2 ≤L 1 。
In one embodiment, the cutting edge structure is configured to be spirally arranged along a circumferential direction in a central axis direction of the cylinder, the circumferential direction being a spiral surrounding direction of the cutting edge structure.
In one embodiment, the number of the cutting edge structures is multiple, and the plurality of cutting edge structures are arranged in a circumferential array around the central axis of the cylinder.
In one embodiment, the external thread includes a distal region proximate the distal end of the cylinder, the cutting edge being disposed on the distal region, the distal region of the external thread being at least partially threaded into the bone.
In one embodiment, the bone implant is a headless bone nail.
According to the bone implant, in an orthopedic surgery, the guide pin is used for establishing a main nail channel of the bone implant at a position to be operated, after the needle inserting direction of the guide pin is determined, the bone implant can be screwed into the main nail channel, the cutting edge structure is configured to cut cutting force of bone formation along the rotating direction in the screwing process, and the radial size of the external thread is larger than that of the main nail channel.
Drawings
Fig. 1 shows a cross-sectional view of a bone implant according to a first embodiment of the present application;
fig. 2 shows a schematic perspective view of a bone implant according to a first embodiment of the present application;
FIG. 3 shows a cross-sectional view of FIG. 2;
FIG. 4 showsbase:Sub>A cross-sectional view at A-A of FIG. 3;
FIG. 5 shows a corresponding plot of FIG. 4;
fig. 6 shows a schematic structural view of a bone implant of a second embodiment of the present application;
FIG. 7 shows a partial structural schematic of FIG. 6;
fig. 8 shows a schematic structural view of a bone implant of a third embodiment of the present application.
In the figure: 10. a bone implant; 110. a cylinder; 1101. a proximal end; 1102. a distal end; 120. an external thread; 121. screw teeth; 122. a distal region; 130. a cutting edge structure; 131. a blade portion; 1311. a first land surface; 1312. a second land surface; 1313. a proximal side; 1314. a distal edge.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiment in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and therefore the application is not limited to the specific embodiments disclosed below.
In the description of the present application, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.
In an orthopedic surgery, a guide pin is used to establish a main nail channel of a bone implant (such as a bone nail) at a site to be operated, and then the bone implant is used to expand a bone at the site to be operated, and in order to achieve better expansion of the bone implant at the site to be operated, a radial dimension of a distal end of the bone implant needs to be made larger, and a radial dimension of an external thread of the bone implant is larger than a radial dimension of the main nail channel.
Based on this, the inventor of the present application has devised a bone implant, the distal end of which has a cutting edge structure formed on the external thread, so that the bone at the site to be operated can be cut using the cutting edge structure when the bone implant is screwed in, and the radial dimension of the main nail passage can be enlarged and the screwing resistance of the bone implant can be reduced.
Fig. 1 shows a cross-sectional view of a bone implant 10 of a first embodiment of the present application, and fig. 2 shows a schematic perspective view of the bone implant 10 of the first embodiment of the present application.
Referring to fig. 1 and 2 in combination with fig. 3, in some embodiments of the present application, a bone implant 10 is provided that includes a post 110 extending from a proximal end 1101 to a distal end 1102, where generally the proximal end 1101 of the post 110 refers to an end of the post 110 that is proximal to a site to be operated on as the bone implant 10 is screwed into a bone, and the distal end 1102 of the post 110 refers to an end of the post 110 that is distal to the site to be operated on as the bone implant 10 is screwed into a bone.
The "cutting force in the rotational direction" mentioned above refers to a cutting force in the circumferential direction of the bone implant 10 that is capable of forming a bone during screwing of the bone implant 10 into the site to be operated on.
As mentioned above, the guide pin is used to establish the main nail channel of the bone implant 10 at the site to be operated, when the insertion direction of the guide pin is determined, the bone implant 10 can be screwed into the main nail channel, and since the cutting edge structure 130 is configured to form a cutting force in the rotation direction to the bone during screwing in, in combination with the radial dimension of the external thread 120 being larger than the radial dimension of the main nail channel, it can be understood that, during screwing in the main nail channel, the cutting edge structure 130 on the distal end 1102 can be used to cut the bone at the site to be operated, which can not only enlarge the radial dimension of the main nail channel and open the bone at the site to be operated, but also reduce the screwing in resistance of the distal end 1102 of the bone implant 10, i.e. reduce the screwing in resistance of the head of the bone implant 10, avoid the excessively large screwing in resistance formed by the distal end 1102 of the column 110, which can effectively reduce the difficulty or fracture of the bone implant 10, operation time and the occurrence probability of damages such as increase and displacement of the bone fracture block.
In some embodiments, referring to fig. 2, fig. 6 and fig. 8, the cutting edge structure 130 includes a plurality of cutting edges 131 formed on the plurality of threads 121 of the external thread 120, and the cutting edges 131 correspond to the threads 121 one to one.
In the process of screwing the bone implant 10 into the site to be operated, the plurality of threads 121 are screwed into the main nail channel of the site to be operated in sequence, so that the cutting edge portion 131 on each thread 121 can form cutting force to the bone along the rotation direction, and the excessively large screwing resistance formed at the distal end 1102 of the column 110 can be better avoided, thereby effectively reducing the occurrence probability of the hazards of slipping or breaking of the bone implant 10, increase of operation time and difficulty, displacement of the fracture block and the like.
In some embodiments, referring to fig. 2, 6 and 8, the cutting edge portion 131 is configured as a notch formed on the thread 121.
In the process of screwing the bone implant 10 into the site to be operated, the notches formed on the screw teeth 121 can more easily form a cutting force in the rotational direction to the bone, improving the cutting effect, so that the radial dimension of the main nail passage can be well enlarged, and the screwing resistance of the distal end 1102 of the bone implant 10 can be reduced.
In some embodiments, the dimension of the cutting edge 131 in the radial direction is smaller than or equal to the radial dimension of the thread 121 of the external thread 120, that is, the opening depth of the notch formed on the thread 121 is smaller than or equal to the radial dimension of the thread 121 of the external thread 120, so as to avoid the influence of the cutting edge structure 130 on the overall strength of the bone implant 10.
In some embodiments, the cross-sectional shape of the cutting edge 131 is arc-shaped, polygonal, or L-shaped, wherein the cross-section of the cutting edge 131 is parallel to the radial direction of the cutting edge 131.
It will be appreciated that the cutting edge 131 is able to more fully contact the bone during screwing of the bone implant 10, and that the cutting edge 131 may be used to better cut the bone to better form a cutting force in the rotational direction for the bone.
Of course, the cross-sectional shape of the blade portion 131 may be other shapes capable of forming a cutting force in the rotation direction to the bone during screwing, and is not particularly limited herein.
In some embodiments, referring to fig. 4 and 5, each edge 131 includes a first edge 1311 and a second edge 1312 disposed at an included angle α and intersecting with each other at a first intersection line.
The first cutting edge 1311 and the second cutting edge 1312 are arranged in an angle, so that in the process of screwing the bone implant 10 into a position to be operated, the first cutting edge 1311 and the second cutting edge 1312 can both form cutting force along the rotation direction to the bone, the cutting effect is improved, the radial size of the main nail channel can be well enlarged, and the screwing resistance of the bone implant 10 can be well reduced.
In some embodiments, referring to fig. 4 and 5, the included angle α between the first edge 1311 and the second edge 1312 satisfies the condition: alpha is more than or equal to 70 degrees and less than or equal to 110 degrees.
If the included angle α between the first cutting edge 1311 and the second cutting edge 1312 is too large, the cutting edge 131 may become blunt, which may affect the cutting effect; if the included angle α between the first cutting edge surface 1311 and the second cutting edge surface 1312 is too small, the strength of the cutting edge portion 131 is affected. Therefore, the included angle α needs to be set in a suitable range, for example, α is set to be greater than or equal to 70 ° and less than or equal to 110 °, so that the blade portion 131 can be prevented from becoming blunt, the strength of the blade portion 131 can be ensured, and the cutting effect can be effectively improved.
In some embodiments, referring to fig. 2 and 5, a plane passing through the central axis of the cylinder 110 and parallel to the first cutting edge 1311 is defined as a first plane, and the first cutting edge 1311 and the first plane have a predetermined interval D therebetween along the rotation direction.
If there is a space between the first cutting edge surface 1311 and the first plane in the direction opposite to the rotation direction, the cutting edge portion 131 may be dulled; if the interval between the first cutting edge 1311 and the first plane in the rotation direction is too large, the cutting edge 131 may cut too much bone, and the strength of the cutting edge 131 may not be sufficient to resist too much bone; therefore, the preset interval D between the first cutting edge surface 1311 and the first plane along the rotation direction is required to prevent the cutting edge portion 131 from becoming blunt, ensure that the strength of the cutting edge portion 131 is sufficient to cut the corresponding bone, improve the cutting effect, and reduce the cutting resistance.
In particular, in the embodiment shown in fig. 2 and 5, if the viewing angle is towards the distal end 1102 of the cylinder 110 and away from the proximal end 1101 of the cylinder 110, the rotation direction corresponds to the counterclockwise direction around the central axis of the cylinder 110 shown in fig. 5, and then the first cutting edge surface 1311 has a predetermined spacing D from the first plane along the rotation direction.
In some embodiments, D satisfies the condition: d is more than or equal to 0 and less than or equal to 2mm. So, can guarantee well that the intensity of cutting edge portion 131 is enough to cut the bone that corresponds, can effectively improve the cutting effect to reduce the cutting resistance.
In some embodiments, referring to fig. 5, a plane passing through the outer edge of the first cutting edge 1311 and the central axis of the cylinder 110 is defined as a second plane, and the first cutting edge 1311 and the second plane are disposed at an acute angle β, where the acute angle β satisfies the condition: beta is more than or equal to 0 degree and less than or equal to 20 degrees.
If β is less than 0 °, it may cause the blade portion 131 to become dull; if β is too large, the cutting edge 131 will cut too much bone, and the cutting edge 131 will not be strong enough to resist too much bone; therefore, the beta is controlled in a proper range, for example, the beta is set to be more than or equal to 0 degrees and less than or equal to 20 degrees, so that the edge part 131 can be prevented from being blunted, the strength of the edge part 131 can be ensured to be enough for cutting corresponding bones, the cutting effect is improved, and the cutting resistance can be reduced.
Typically, the spacing between the first edge face 1311 and the first plane in the direction of rotation is directly related to the acute angle β.
In some embodiments, referring to fig. 2 and 3, the cutting edge 131 closest to the distal end 1102 is a first cutting edge, the cutting edge 131 closest to the proximal end 1101 is a second cutting edge, and a first boundary line between the first cutting edge and the second cutting edge is configured as an arc line formed by inward recession relative to the external thread 120.
The first boundary line that first cutting edge portion and second cutting edge portion correspond is the pitch arc, so, the both ends that are equivalent to the line that the first boundary line that a plurality of cutting edge portions 131 correspond connects the formation form the fillet, can improve cutting edge structure 130's toughness, avoid appearing stress concentration.
In some embodiments, the first boundary lines corresponding to the first cutting edge portions are respectively represented by R 1 Transition, the first boundary line corresponding to the second cutting edge portion is defined by R 2 Transition wherein R 1 ≤5mm，R 2 Not less than 1mm, and can avoid stress concentration.
In some embodiments, a first boundary line between the first cutting edge portion and the second cutting edge portion corresponding to the cutting edge portion 131 is disposed at an included angle γ with the central axis of the cylinder 110, and the included angle γ satisfies the condition: gamma is more than or equal to 1 degree and less than or equal to 10 degrees.
Gamma is too small, the cutting effect is not good, gamma is too large, and the cutting edge part 131 can be dull, therefore, gamma needs to be controlled in a proper range, the dulling of the cutting edge part 131 can be avoided, and the cutting effect of the cutting edge structure 130 can be improved.
In some embodiments, referring to fig. 6 and 7, the cutting edge 131 has a proximal edge 1313 and a distal edge 1314 opposite to each other along the axial direction of the cylindrical body 110, and the proximal edge 1313 is closer to the central axis of the cylindrical body 110 than the distal edge 1314.
With such an arrangement, the proximal edge 1313 closer to the site to be operated can be made closer to the central axis of the cylinder 110, which is equivalent to the cutting edge 131 being inclined with respect to the central axis of the cylinder 110, thereby forming a beveling effect, improving the cutting effect, and reducing the cutting resistance.
In some embodiments, referring to FIG. 3,the external thread 120 includes a distal region 122 near the distal end 1102 of the cylinder 110, the cutting edge 130 is disposed on the thread 121 of the distal region 122, and the dimension of the distal region 122 in the central axis direction of the cylinder 110 is L 1 The dimension of the cutting edge structure 130 in the central axis direction of the column body 110 is L 2 ，L 1 And L 2 The following relationship is satisfied: l is more than 2mm 2 ≤L 1 。
If L is 2 Too short, the cutting effect of the cutting edge structure 130 is not good, and the drag reduction effect is not obvious; if L is 2 Too long, it may affect the strength of the bone implant 10 at the distal region 122; for this purpose, L is required 2 The cutting effect of the cutting edge structure 130 can be ensured and the drag reduction effect can be improved without affecting the strength of the bone implant 10 at the distal end region 122 by controlling within an appropriate range.
In some embodiments, referring to fig. 8, the cutting edge structure 130 is configured to be spirally disposed along the circumferential direction in the central axis direction of the cylinder 110, and the circumferential direction is the spiral surrounding direction of the cutting edge structure 130.
The cutting edge 130 is configured to be spiral to further reduce threading resistance and facilitate threading or unthreading of the bone implant 10 from the bone.
In some embodiments, referring to fig. 4 and 5, the number of the cutting edge structures 130 is multiple, and the multiple cutting edge structures 130 are arranged in a circumferential array around the central axis of the cylinder 110.
The plurality of cutting edge structures 130 arranged in a circumferential array around the central axis of the cylinder 110 may enhance the cutting effect and further reduce the screwing resistance.
In some embodiments, the external thread 120 includes a distal region 122 proximate the distal end 1102 of the cylinder 110, the cutting edge structure 130 is disposed on the distal region 122, and the distal region 122 of the external thread 120 may be at least partially threaded into bone.
The distal end region 122 of the external thread 120 may be at least partially screwed into the bone, which may mean that the distal end region 122 of the external thread 120 is fully screwed into the bone, or that the portion of the distal end region 122 of the external thread 120 is screwed into the bone, and is not particularly limited herein.
During threading of the bone implant 10 into the site to be operated on, the distal region 122 may be at least partially threaded into the bone, and the cutting force in the rotational direction may be better formed to the bone during threading by the cutting edge structure 130 on the distal region 122 to reduce the threading resistance of the distal region 122.
In some embodiments, the bone implant 10 is a headless bone nail. Headless bone screws include, but are not limited to, headless pressurized hollow screws.
In general, a section of the headless bone screw near the distal end 1102 needs to be screwed into the bone completely or mostly, and thus, the cutting edge structure 130 provided on the section of the headless bone screw near the distal end 1102 can provide cutting force to the bone in the rotating direction during screwing process, so as to reduce the screwing resistance of the section of the headless bone screw near the distal end 1102.
In some embodiments, referring to fig. 1-3, bone implant 10 includes a post 110 extending from a proximal end 1101 to a distal end 1102, post 110 being provided with external threads 120 and configured for threaded engagement with bone. The distal end 1102 of the cylindrical body 110 has a radial dimension greater than the radial dimension of the proximal end 1101 of the cylindrical body 110, and at least one cutting edge structure 130 formed on the external threads 120 at the distal end 1102 of the cylindrical body 110, the cutting edge structure 130 being configured to form a cutting force in a rotational direction on the bone during screwing. The cutting edge structure 130 comprises a plurality of cutting edges 131 formed on a plurality of threads 121 of the external thread 120, the cutting edges 131 correspond to the threads 121 one by one, the external thread 120 comprises a distal region 122 close to the distal end 1102 of the cylinder 110, the cutting edge structure 130 is arranged on the threads 121 of the distal region 122, and the distal region 122 of the external thread 120 can be at least partially screwed into a bone.
As mentioned above, the guide pin is used to establish a main nail channel of the bone implant 10 at the site to be operated, after the needle insertion direction of the guide pin is determined, the bone implant 10 can be screwed into the main nail channel, the proximal end 1101 of the bone implant 10 can be firstly contacted with the site to be operated, the plurality of blade portions 131 are contacted with the bone one by one as the bone implant 10 is screwed into the main nail channel, and the cutting force along the rotation direction is formed for the bone, so that the radial dimension of the main nail channel can be enlarged, the bone at the site to be operated can be expanded, the screwing resistance of the distal end 1102 of the bone implant 10 can be reduced, the too large screwing resistance formed by the distal end region 122 of the column 110 can be avoided, and the occurrence probability of hazards such as slipping or breaking of the bone implant 10, increasing the operation time and difficulty, and displacement of the fracture block can be effectively reduced.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.
Claims (16)
1. A bone implant comprising a post extending from a proximal end to a distal end, the post having external threads thereon and being configured for threaded engagement with bone;
wherein a radial dimension of the distal end of the post is greater than a radial dimension of the proximal end of the post;
the distal end of the post body also has at least one cutting edge structure formed on the external thread, the cutting edge structure being configured to form a cutting force on the bone in a rotational direction during screwing.
2. The bone implant as recited in claim 1, wherein the cutting edge structure comprises a plurality of cutting edge portions formed on a plurality of threads of the external thread, the cutting edge portions corresponding one-to-one with the threads.
3. The bone implant of claim 2, wherein the lip portion is configured as a notch formed on the screw thread.
4. The bone implant according to claim 3, wherein a cross-sectional shape of the lip portion is an arc, a polygon, or an L-shape;
wherein a cross-section of the lip portion is parallel to a radial direction of the lip portion.
5. The bone implant according to claim 3, wherein each of the cutting edges comprises a first edge surface and a second edge surface disposed at an included angle α and intersecting at a first intersection line.
6. The bone implant according to claim 5, wherein an included angle α between the first cutting edge face and the second cutting edge face satisfies a condition:
70°≤α≤110°。
7. the bone implant of claim 5, wherein a plane defined through a central axis of the post and parallel to the first land surface is a first plane;
in the rotating direction, the first cutting edge surface and the first plane have a preset interval D therebetween.
8. The bone implant of claim 5, wherein a plane defined through an outboard edge of the first land surface and a central axis of the post is a second plane;
the first cutting edge surface and the second plane are arranged in an acute angle beta, and the acute angle beta meets the condition that:
0°≤β≤20°。
9. the bone implant according to claim 5, wherein the lip portion closest to the distal end is a first lip portion and the lip portion closest to the proximal end is a second lip portion;
the first intersection line of the first cutting edge portion and the second cutting edge portion is configured as an arc line formed by being recessed inward with respect to the external thread.
10. The bone implant according to claim 9, wherein the first boundary line between the first cutting edge portion and the second cutting edge portion corresponding to the cutting edge portion is disposed at an included angle γ with the central axis of the column, and the included angle γ satisfies the condition:
1°≤γ≤10°。
11. the bone implant according to claim 3, wherein the lip portion has a proximal side and a distal side disposed oppositely in an axial direction of the post, the proximal side being closer to a central axis of the post than the distal side.
12. The bone implant according to any one of claims 2-11, wherein the external thread includes a distal region proximate the distal end of the post, the cutting edge structure being disposed on the threads of the distal region;
the dimension of the distal end area in the central axis direction of the cylinder is L 1 The size of the cutting edge structure in the direction of the central axis of the column body is L 2 ，L 1 And L 2 The following relationship is satisfied:
2mm＜L 2 ≤L 1 。
13. the bone implant according to claim 1, wherein the cutting edge structure is configured to be helically disposed in a circumferential direction in a central axis direction of the column;
the circumferential direction is a spiral surrounding direction of the cutting edge structure.
14. The bone implant according to any one of claims 1-11, wherein the plurality of cutting edge structures is a plurality of cutting edge structures arranged in a circumferential array about a central axis of the post.
15. The bone implant according to any one of claims 1-11, wherein the external thread includes a distal region proximate the distal end of the post, the cutting edge structure being disposed on the distal region;
the distal end region of the external thread may be at least partially threaded into bone.
16. The bone implant according to any one of claims 1-11, wherein the bone implant is a headless bone nail.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221650651.1U CN218500793U (en) | 2022-06-29 | 2022-06-29 | Bone implant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221650651.1U CN218500793U (en) | 2022-06-29 | 2022-06-29 | Bone implant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218500793U true CN218500793U (en) | 2023-02-21 |
Family
ID=85205653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221650651.1U Active CN218500793U (en) | 2022-06-29 | 2022-06-29 | Bone implant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218500793U (en) |
-
2022
- 2022-06-29 CN CN202221650651.1U patent/CN218500793U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20210022784A1 (en) | Method of installing self-drilling, self-tapping bone screw for bicortical purchase | |
| AU2006220382B2 (en) | Bone stabilization system including plate having fixed-angled holes together with unidirectional locking screws & surgeon directed locking screws | |
| EP1677690B1 (en) | Anatomical distal radius fracture fixation plate | |
| EP1996120B1 (en) | Bone stabilization system including multi-directional threaded fixation element | |
| US8496694B2 (en) | Variable angle locking buttress pins | |
| EP2258288B1 (en) | Anatomical distal radius fracture fixation plate | |
| EP2185087B1 (en) | Bone plates and bone plate assemblies | |
| US20200261128A1 (en) | Intramedullary implant with proximal plate and method for its use | |
| JP6419733B2 (en) | Universal screw design and cutting tool | |
| US11490903B2 (en) | System and method for installing a bicortical implant in bone | |
| US10285745B2 (en) | Orthopedic screws | |
| CN218500793U (en) | Bone implant | |
| JPS62243551A (en) | Fixing apuncture pin in external bone connection technique | |
| CN109363756B (en) | Proximal femur cross-locking intramedullary nail | |
| CN219000514U (en) | Compression bone screw |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |