CN209826932U - Tibia bone fracture plate - Google Patents
Tibia bone fracture plate Download PDFInfo
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- CN209826932U CN209826932U CN201821826878.0U CN201821826878U CN209826932U CN 209826932 U CN209826932 U CN 209826932U CN 201821826878 U CN201821826878 U CN 201821826878U CN 209826932 U CN209826932 U CN 209826932U
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Abstract
The utility model discloses a shin bone coaptation board has the front of laminating with the skeleton and the back relative with the front, include: the bone fracture plate comprises a bone fracture plate body, wherein a plurality of screw holes are formed in the bone fracture plate body; the surface texture units are formed around each screw hole on the front side and/or the back side respectively, the surface texture units are radial arrays of pits based on the screw holes, and the radial arrays are uniformly distributed in the circumferential direction of the screw holes; the drug containing layer at least has a part positioned in the concave pit. The foundation the utility model discloses a stress distribution on the shin bone coaptation board is effectively improved to the shin bone coaptation board, and the coaptation board is difficult to inefficacy relatively.
Description
Technical Field
The utility model relates to a shin bone plate.
Background
The tibia is one of the two bones of the lower leg, is positioned at the inner side of the lower leg, plays an important role in supporting the body and is the main weight bearing bone in the lower leg. There may be a body and two ends, the upper end of which is commonly referred to as the proximal end and the lower end of which is commonly referred to as the distal end, wherein a distal fracture belongs to multiple fractures and a fracture of the diaphysis portion between the two ends belongs to a fracture of the tibialis body, which is relatively rare but nevertheless may occur. The utility model relates to a shin bone fusiform coaptation board is used for the internal fixation of shin diaphysis fracture.
Tibial fractures are a multiple fracture, accounting for 1/4, the incidence of total body fractures. The internal fixation material used clinically at present is mainly a titanium alloy material, and the material has the advantages of excellent corrosion resistance and mechanical property, but has poor biocompatibility, high price and larger difference between density and elasticity and natural bone, and is easy to cause stress shielding phenomenon, influence the growth of bone tissues and prolong healing time. And the fracture of the bone fracture plate is easily caused by external force during the treatment of the patient, thereby losing efficacy.
The fracture of the bone plate is mainly influenced by insufficient strength of the bone plate, and the factor influencing the strength of the bone plate is the structure of the bone plate. Generally, the bone fracture plate is a strip-shaped plate with a certain length, and in order to reduce the influence of stress shielding and the influence on surrounding tissues, the length and the width of the plate are limited, and the strength of other structures on the bone fracture plate needs to be reduced under the condition that the maximum strength of a base body is limited.
The screw holes or other holes on the bone plate, such as kirschner wire holes, which are one of the structural factors affecting the strength of the bone plate, can generate stress concentration, so that the local strength of the bone plate is reduced, and the bone plate is easy to break at the corresponding holes. Under such conditions, other structures may be machined into the bone plate to reduce the effects of stress concentrations, but machining of other structures may also result in a reduction in the overall strength of the bone plate when stress concentrations are attenuated.
In addition, internal fixation of implanted medical devices often induces infection, resulting in surgical failure, loss of limbs in the rigors, and even life-threatening conditions, and if administered systemically, there is a risk of low drug concentration at the site of the lesion, potentially damaging other tissues and organs such as the liver, kidney, and ear. In addition, because the bone fracture plate is an explant, immune response is easy to generate in vivo, and the bioactivity is low. Therefore, it is currently common practice to place drugs on, for example, bone plates.
One of the ways of applying the drug to the bone plate is to spray the drug on the bone plate to form a coating in which the drug is contained. However, the coating is not too thick, so that the selection of the coating material has more rigorous requirements, the preparation process of the coating is complicated, and the cost is higher. The key point of the problem is that the medicine carried by the coating is less, the release surface area is larger, the medicine slow release effect is lower, the medicine can be released in a short time and can not be matched with the internal fixing time of the bone fracture plate.
Further, at present, a surface texture formed by processing micropores on the bone fracture plate is processed, for example, a micropore array is processed on the surface of the bone fracture plate by using a laser femtosecond technology, and then a medicament is placed into the micropores by using other processes, so that the area of a medicament release surface is relatively small, and the release speed of the medicament is easy to control. At present, the manufacturing of the surface texture only considers the release speed and the dosage of the medicine, and the influence of the surface texture on the strength of the bone fracture plate is rarely considered.
The stress distribution diagram of the bone plate shown in fig. 1 without surface texture is shown in the left side of the diagram as the intensity scale in MPa, and the stress distribution diagram is generated by the workbench software (manufactured by ANSYS corporation) and is expressed by different colors, and is a gray scale diagram, wherein the colors of the two scales are similar to those of the lower scale, and are not substantially used, and the gray scale diagram does not influence the analysis of the diagram. It can be seen that the bone plate is significantly weakened throughout the bone plate by the screw holes.
FIG. 2 shows the stress distribution pattern for screw hole offset, where it can be seen that the local strength at the screw hole is low and once broken, the bone plate cannot be fixed. The surface texture is the micropores of the rectangular array, and the overall strength of the bone fracture plate is lower.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a distribution of improvement coaptation board upper surface texture provides a shin bone coaptation board, effectively improves the stress distribution on the coaptation board, and the coaptation board is difficult to inefficacy relatively.
According to the utility model discloses an embodiment provides a shin bone plate, has the front of laminating with the skeleton and the back relative with the front, include:
the bone fracture plate comprises a bone fracture plate body, wherein a plurality of screw holes are formed in the bone fracture plate body;
the surface texture units are formed around each screw hole on the front side and/or the back side respectively, the surface texture units are radial arrays of pits based on the screw holes, and the radial arrays are uniformly distributed in the circumferential direction of the screw holes;
the drug containing layer at least has a part positioned in the concave pit.
The tibial bone plate described above, optionally, fits into 8 radial arrays of each screw hole, with 2 ~ 4 dimples in each radial array.
Optionally, the depth of the concave pit is not more than one seventh of the thickness of the bone plate body and not less than one tenth of the thickness of the bone plate body;
the aperture of the pit is 1.5 ~ 2.5.5 times of the depth of the pit.
Optionally, a pair of through holes are formed between the adjacent screw holes, and the connecting line of the through holes is vertical to the length direction of the bone fracture plate body;
the aperture of the through hole is ~ half of the larger diameter of the screw hole.
Optionally, the two ends of the bone fracture plate body are round heads, and the width of the bone fracture plate body is gradually reduced from the middle part to the two ends;
the two edges of the middle part of the bone fracture plate body are arc edges;
the edge line between the middle part and the round head is tangent with the corresponding side arc edge and the round head.
Optionally, the rounded head has a central angle of 110 ° ~ 120 ° and the arcuate edge has a central angle of 120 ° ~ 130 °.
Optionally, the widest part of the bone plate body is 1.39 ~ 1.42.42 times the chord length of the rounded head.
Optionally, the back face is provided with a cuff facing away from the front face.
Optionally, the end of the cuff is provided with an inward projection.
Optionally, the projection is widest at the middle of the bone plate body and tapers to two ends.
For the surface texture that fluting or simple array micropore or pit formed on the coaptation board, the utility model discloses fully considered surface texture to the influence of coaptation board stress distribution, proposed the radial array around the pit of screw hole, the coaptation board stress distribution of this kind of structure is more reasonable, is difficult to the rupture relatively, and has higher reliability.
Drawings
Fig. 1 is a stress distribution diagram of a known tibial bone plate without surface texture.
Fig. 2 is a stress distribution diagram of a known tibial bone plate with a uniform surface texture.
Fig. 3 is a schematic view of a fixing structure of the tibial fusiform bone plate on the tibial diaphysis in an embodiment.
Fig. 4 is a top view of the tibial fusiform bone plate in an embodiment.
Fig. 5 is a schematic front view of the structure corresponding to fig. 2.
FIG. 6 is a stress profile of a tibial fusiform plate according to an embodiment.
In the figure: 1. the bone fracture plate comprises a proximal end of the bone fracture plate, 2 parts of screws, 3 parts of surface textures, 4 parts of adjusting holes, 5 parts of waists, 6 parts of a bone fracture plate body, 7 parts of a distal end of the bone fracture plate, 8 parts of screw holes, 9 parts of flanges and 10 parts of bulges.
A. Distal tibia, broken bone, and fastening proximal tibia.
Detailed Description
Referring to the description and the attached drawing 3, it can be understood that the basic reference frame is the proximal end and the distal end of the tibia, namely the proximal tibia C and the distal tibia A shown in the drawing, and for the fracture of the tibial diaphysis, the middle part of the tibial bone fracture plate is just positioned at the broken bone B, and the stress environment in the middle part of the tibial bone fracture plate is the worst.
In addition, the width direction of the bone fracture plate is matched with the circumferential direction of the tibia, and the length direction of the bone fracture plate is matched with the length direction of the tibia.
It will be appreciated that for the enclosure, the enclosure is inward, as opposed to inward.
Fig. 3 is a schematic view showing a fixed state of the tibia bone plate to the tibia, in which the surface of the tibia bone plate which can be directly observed is the back surface of the tibia bone plate, and the surface of the tibia bone plate which is covered by the bone plate body 6 and attached to the tibia is the front surface of the tibia bone plate.
In general, a number of screw holes 8 are required in the bone plate body 6 for fixation of the bone plate to, for example, the tibia. The fracture of the tibial diaphysis is different from the fracture of the proximal end C of the tibia and the fracture of the distal end A of the tibia, the bone fracture plates used for the two fractures are not of symmetrical structures, the bone fracture plates used for the fracture of the tibial diaphysis are integrally symmetrical, the position of a broken bone B is taken as a symmetrical plane in the determined length direction, and the bone fracture plate body 6 is symmetrical relative to the symmetrical plane.
In addition, the bone plate body 6 is also symmetrical about a plane of symmetry in its width direction.
As shown in fig. 1, the presence of the screw hole 8 has a relatively large effect on the bone plate body 6, and the stress concentration effect is very significant.
It can be seen in fig. 4 that the number of the screw holes 8 is eight, the screw holes are substantially uniformly distributed in the length direction of the bone fracture plate body 6, in order to improve the problem of stress concentration, a surface texture unit is prepared on the surface of the bone fracture plate body 6, which is different from the conventional surface texture, and the surface of the bone fracture plate body 6 is used as a reference, in the embodiment of the present invention, the problem of stress concentration generated by the existence of the screw hole 8 is fully considered, and the arrangement of the surface texture 3 is not only used for increasing the dosage, slowly releasing the disposed medicine, but also is used for improving the problem of stress concentration of the bone fracture plate body 6.
Specifically, a surface texture unit is formed around each screw hole 8 on the front surface and/or the back surface of the bone plate body 6, the surface texture unit is a radial array of pits based on the screw holes 8, and the radial array is uniformly distributed in the circumferential direction of the screw holes 8.
With respect to the radial array, when it is evenly distributed around the screw holes 8, it may also be referred to as an annular array to some extent.
Since the number of pits may not be uniform across each radial array, the description herein is based on radial arrays.
Description of the drawings fig. 6 is a stress distribution diagram of a shuttle-shaped tibial bone plate with a radial array of recesses, where it can be seen that the screw hole 8 and the rim are relatively weak, and the screw hole 8 is directly fixed and pressed by the screw 2, and in the fixed state, the relatively weak portion is not much affected. And for the edge, it is a portion that is easily reinforced.
Further, a drug-containing layer is provided, the drug-containing layer having at least a portion located within the well.
The bone plate has surface textures 9 on both the front and back sides, based on an antimicrobial agent, such as iodine. With respect to iodine, it has one physical property: iodine solids belong to molecular crystals and are held together by relatively weak van der waals forces between molecules. Although elemental iodine has a boiling point of 184.35 deg.C (under standard conditions), when solid iodine is heated slightly, the mobility of iodine molecules is beyond the van der Waals force constraint and sublimated into iodine vapor. Iodine vapor can enter very tiny voids, which can be considered as non-porous, and desublimates at slightly lower temperatures. The utility model utilizes the physical property of iodine to load iodine into surface texture.
In addition, the iodine has small irritation to skin and mucosa, has strong killing effect on bacteria, spores, viruses and the like, can gradually release iodine in vivo to achieve the effect of continuous sterilization, is an important component of thyroid hormone, needs a certain amount of iodine for development and metabolism of organs of the whole body of a human body to play a role, has rare anaphylactic reaction and has no drug resistance. Not only has good biocompatibility, but also can continuously resist bacteria.
The surface texture 3 is processed by adopting a laser femtosecond processing technology, the pore diameter of a pore (pit) is easy to control, and the distribution mode is also easy to control.
With respect to surface texture 3, in fig. 4 there is an array of microwells.
Regarding the medicine placing, not being limited to iodine, it can be understood that the medicine suitable for placing medicine on the tibia bone fracture plate at present can be placed on the tibia bone fracture plate provided by the embodiment of the present invention. Such as antibiotic, povidone iodine, organic antibacterial (silver, copper) etc., and the bioactive agent can be hydroxyapatite, icariin, etc.
In addition, besides the medicines in the surface texture 3, a medicine containing layer can be formed on the surface of the bone fracture plate body 6, the medicine components of the medicine containing layer on the surface of the bone fracture plate body 6 can be different from those of the medicines in the pits, and in the early stage of internal fixation, the dosage is relatively large, so that the medicines can be quickly released.
Regarding the number of the concave holes, the number is not too large, otherwise, the weakening of the bone fracture plate body 6 is too large, stress concentration generated by the threaded holes 8 is adjusted through a certain number of concave holes under the condition of meeting the dosage requirement, the number of the radial arrays which are matched with each screw hole 8 is 8, and the number of the concave holes on each radial array is 2 ~ 4.
Further, in the case where the number of recesses is relatively small, it is necessary to have a sufficient depth, specifically, a depth of the recess is not more than a seventh of the thickness of the bone plate body 6 and not less than a tenth of the thickness of the bone plate body 6.
The aperture of the pit is 1.5 ~ 2.5.5 times of the depth of the pit, thereby meeting the requirement of certain drug loading.
In contrast, the adjustment capability of the pits is relatively weak, and in a preferred embodiment, a pair of through holes, such as the adjustment holes 4 shown in fig. 3, are formed between the adjacent screw holes 8, the connecting lines of the pair of adjustment holes 4 are perpendicular to the length direction of the bone plate body 6, and the adjustment holes 4 are used for adjusting the change of the shear section coefficient in the length direction of the bone plate body 6 so as to further adjust the stress distribution of the whole bone plate body 6, thereby reducing the influence of stress concentration.
Further, the diameter of the adjustment hole 4 is two fifths ~ half of the larger diameter of the screw hole 8.
As described above, the middle portion of the bone plate body 6 is the worst in the stress environment, and the fracture is most likely to occur in the middle portion even under the condition that the shear section coefficients of the bone plate body 6 are the same at each location. In the configuration shown in fig. 4, the bone plate body 6 has rounded ends at both ends, as shown in fig. 3 for the proximal bone plate 1 and the distal bone plate 7, which are shown rounded. With round heads, it is not meant to be circular in the mechanical field, e.g. round straight holes, the head being substantially semicircular.
In fig. 3, the width of the bone fracture plate body 6 is gradually reduced from the middle to the two ends, the whole body is in a fusiform shape, the shearing-resistant section coefficient is large in the middle, the two ends are small, and the whole anti-fracture capability is higher under the condition that the whole material consumption is less.
When the whole material is less, the area of the whole covering surface of the skeleton is smaller, and the influence on the blood circulation of the skeleton can be reduced.
Further, two edges of the middle part of the bone fracture plate body 6 are arc-shaped edges, such as the waist part 5 shown in fig. 3, and both sides of the part are arc-shaped structures.
Correspondingly, the edge line between the middle part and the round head is tangent with the arc-shaped edge and the round head at the corresponding side, so that the outer edge of the bone fracture plate body 6 is a smooth transition outer edge, stress concentration cannot be generated at the outer edge, and the fracture resistance is stronger.
Further, the round head has a central angle of 110 degrees ~ 120 degrees, the arc-shaped edge has a central angle of 120 degrees ~ 130 degrees, and the trimming edge structure does not excessively increase the length of the bone plate body 6.
Preferably, the widest part of the bone plate body is 1.39 ~ 1.42.42 times, preferably 1.415 times, the chord length of the round head, the whole width is not large, the whole structural strength is relatively high, and particularly the waist part 5 needs to be reinforced.
For example, the maximum stress applied to the back side of the bone plate body 6 is greater than the maximum stress applied to the front side, so that the tibia itself can generate a moment of resistance when folded back to the front side, and the tibia itself cannot generate a moment of resistance when folded back to the back side. The back is equipped with the turn-ups 9 that deviates from the front, and the turn-ups position is specifically at back edge, is equivalent to the strengthening rib on the whole. For the bone fracture plate body 6, the currently commonly used material is magnesium alloy, titanium or titanium alloy, the plasticity is good, the difficulty in forming the flanging 9 is not high, and the flanging 9 can effectively improve the problem that the edge strength of the bone fracture plate body 6 is relatively weak.
Furthermore, the tail end of the flanging 9 is provided with an inward bulge 10, namely, the mouth of the ring body structure formed by the flanging 9 is turned inwards to form the bulge 10, so that the shear section coefficient of the bone fracture plate body 6 can be further improved. The structure can not obviously increase the contact surface area of the bone fracture plate body 6 and the bone, but the strength is greatly improved.
Furthermore, the stress form of the bone fracture plate body 6 is matched, the protrusion 10 is widest in the middle of the bone fracture plate body 6 and gradually narrows towards two ends, and the processing difficulty can be effectively reduced.
Furthermore, the presence of the projections 10 facilitates the recovery of the surrounding tissue, i.e. enables a creeping effect, facilitating the growth of the cells of the surrounding tissue.
The thickness of the bone plate body 6 is preferably 3.8mm, the material is preferably WE43, and WE43 is a medical magnesium alloy material and can be naturally degraded.
Claims (10)
1. A tibial osteosynthesis plate having a front face for engaging a bone and a back face opposite the front face, comprising:
the bone fracture plate comprises a bone fracture plate body, wherein a plurality of screw holes are formed in the bone fracture plate body;
the surface texture units are formed around each screw hole on the front side and/or the back side respectively, the surface texture units are radial arrays of pits based on the screw holes, and the radial arrays are uniformly distributed in the circumferential direction of the screw holes;
the drug containing layer at least has a part positioned in the concave pit.
2. The tibial bone plate of claim 1, wherein the number of radial arrays to fit each screw hole is 8 and the number of dimples on each radial array is 2 ~ 4.
3. The tibial bone plate of claim 2, wherein the recess has a depth no greater than one-seventh of the thickness of the plate body and no less than one-tenth of the thickness of the plate body;
the aperture of the pit is 1.5 ~ 2.5.5 times of the depth of the pit.
4. The tibial bone plate of claim 1, wherein a pair of through holes are formed between adjacent screw holes, and the connecting line of the pair of through holes is perpendicular to the length direction of the bone plate body;
the aperture of the through hole is ~ half of the larger diameter of the screw hole.
5. The tibial bone plate of claim 1, wherein the bone plate body has rounded ends at opposite ends and a width that decreases from the middle portion to the opposite ends;
the two edges of the middle part of the bone fracture plate body are arc edges;
the edge line between the middle part and the round head is tangent with the corresponding side arc edge and the round head.
6. The tibial bone plate of claim 5, wherein the rounded head has a central angle of 110 ° ~ 120 ° and the arcuate edge has a central angle of 120 ° ~ 130 °.
7. The tibial bone plate of claim 5, wherein the widest portion of the plate body is 1.39 ~ 1.42.42 times the chord length of the rounded head.
8. The tibial bone plate of claim 1, wherein the back surface is provided with a flange facing away from the front surface.
9. The tibial bone plate of claim 8, wherein the end of the flange is provided with an inward projection.
10. The tibial bone plate of claim 9, wherein the projection is widest at the middle of the plate body and tapers to two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821826878.0U CN209826932U (en) | 2018-11-07 | 2018-11-07 | Tibia bone fracture plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821826878.0U CN209826932U (en) | 2018-11-07 | 2018-11-07 | Tibia bone fracture plate |
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| Publication Number | Publication Date |
|---|---|
| CN209826932U true CN209826932U (en) | 2019-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821826878.0U Expired - Fee Related CN209826932U (en) | 2018-11-07 | 2018-11-07 | Tibia bone fracture plate |
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| CN (1) | CN209826932U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109316233A (en) * | 2018-11-07 | 2019-02-12 | 济南大学 | Tibia bone plate |
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2018
- 2018-11-07 CN CN201821826878.0U patent/CN209826932U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109316233A (en) * | 2018-11-07 | 2019-02-12 | 济南大学 | Tibia bone plate |
| CN109316233B (en) * | 2018-11-07 | 2024-03-19 | 济南大学 | Tibia bone fracture plate |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191224 Termination date: 20201107 |
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| CF01 | Termination of patent right due to non-payment of annual fee |