CN204500924U - A kind of degradable shape memory rib internal fixtion body - Google Patents
A kind of degradable shape memory rib internal fixtion body Download PDFInfo
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- CN204500924U CN204500924U CN201520021696.6U CN201520021696U CN204500924U CN 204500924 U CN204500924 U CN 204500924U CN 201520021696 U CN201520021696 U CN 201520021696U CN 204500924 U CN204500924 U CN 204500924U
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Abstract
A kind of degradable shape memory rib internal fixtion body, relate to thoracic surgery or orthopaedic medical treatment equipment, particularly relate to a kind of fracture fixation equipment utilizing degradable shape-memory material to realize fracture of rib internal fixtion, be made up of with the blunt nosed cone head being positioned at main part two ends the main part with some barbs; When the temperature of fixed body is lower than phase transition temperature, fixed body remains on temporary shapes, be rendered as that outer surface is smooth, two ends with the column of blunt nosed cone head, can insert in the pulp cavity of rib by fracture site smoothly; Insert rear fixed body and be returned to original shape, be rendered as outer surface with barb, the barbed column of two ends band, barb and agnail thrust the pulp cavity inwall of rib simultaneously, and the rib of fracture site both sides is fixedly secured the two ends at main part.Utilize shape memory effect to realize the internal fixtion of fracture site, be connected firmly and be not easily shifted, implantation surgery is easy and simple to handle, without the need to particular surgical instrument, can reduce medical treatment cost, alleviate patient suffering.
Description
Technical field
This utility model relates to orthopedic medical device or equipment, particularly relates to a kind of degradable fracture fixation equipment utilizing shape-memory material to realize fracture of rib internal fixtion.
Background technology
Fracture of rib is modal wound type in thoracic injury, accounts for more than 60% of thoracic injury.The method of fracture of rib treatment is more, has expectant treatment and the large class of operative treatment two.For the fracture of rib that rib para-position is undesirable to line, particularly do not do the flail chest patient that anatomy resets, often need surgical menopause.
The method of current surgical menopause fracture of rib has multiple, and as Kirschner wire internal fixtion, steel wire, pottery follows closely and rib steel plate, steel wire bundle are fixed, fracture with memory alloy embrace fixator rib is fixed, Absorbable rod rib follows closely internal fixtion etc.Wherein Absorbable rod rib nail internal fixation treatment fracture of rib is that a kind of damage is little, without the need to the method that second operation takes out, is accepted extensively by clinicist.The Absorbable rod rib nail of current Clinical practice comprises Poly-L-lactic acid Absorbable rod rib intramedullary pin, fructus crotonis (GRAND FIXTM) Absorbable rod rib nail etc., insert Absorbable rod rib nail by expanding after marrow in art, then the suture reinforce fractured broken ends of fractured bone after rib is drawn in para-position over to one's side.Chinese utility model patent " Absorbable rod rib intramedullary pin " (utility model patent number: ZL201020547119.8, authorize publication No.: CN201894668U) disclose the Absorbable rod rib intramedullary pin that a kind of medical magnesium alloy absorbed by degradable makes, described rib intramedullary pin is the arcuate structure that two ends tilt, rivet nut surface is provided with anticreep agnail, described anticreep agnail and rivet nut in a certain angle, drawn in rivet nut center by both sides, described rivet nut two ends are the blunt nosed structure of taper.This utility model has plasticity, according to rib radian random molding, and can degradation in vivo can absorb, and absorbs potruncus CT, MRI and checks without impact; Histocompatibility is good, taking-up of need not again performing the operation.Although these equipment have anti-skidding band or anticreep agnail, but all automatically do not shrink fixing function, it is fixing firm not to exist, easy displacement, often need the suture reinforce fractured broken ends of fractured bone again, so not only can affect the blood confession of periosteum, the healing of impact fracture, also can affect the intercostal nerves pressurized making to be positioned at rib lower edge, cause postoperative pain.201310033265.7), " a kind of Combined rib fixer " (application for a patent for invention number: 201110269350.4) and " degradable rib fixer " (application for a patent for invention number: 201110363086.0) Chinese invention patent application " a kind of absorbable fracture fixed body " (application for a patent for invention number:, disclose some fix fracture site rib fracture fixing apparatus material by the method in overall parcel fracture outside, the blood that the use of these equipment exists equally affects periosteum supplies, affects union of fracture and the postoperative problem causing pain.Because the fixation postures of these equipment is outside rib, fixed position out-of-flatness also can be caused to affect attractive in appearance.
Chinese invention patent " bidirectional shape memory polymer composite material and preparation method thereof " (patent of invention number: ZL 200610136572.8 Authorization Notice No.: CN101164770B) discloses a kind of polymer composites with bidirectional shape memory effect and preparation method thereof, this polymer composites is superposed sticky with the elastomeric material that can initiatively reply by the polymeric material with shape memory function and is formed, and has bidirectional shape memory effect.The shape memory recovery temperature scope of this polymer composites is large, can by the bidirectional shape memory function selecting different shape-memory polymers to obtain difformity recovery temperature, concurrent deformation amount is large, there is good bidirectional shape memory function, and its bidirectional shape memory performance can pass through the acquisitions such as the thickness of adjustable shape memory polymer thickness and elastomeric material.But this polymer composites does not belong to Biodegradable material, the orthopedic fixer material that can not absorb for the manufacture of degradable because it does not possess histocompatibility.
Utility model content
The purpose of this utility model is to provide a kind of degradable shape memory rib internal fixtion body, utilize the shape memory function of Biodegradable macromolecule composite material, the oneself realizing fracture site resets contraction fixation, stable fixing technical problem in the marrow solving fracture of rib.
This utility model solves the problems of the technologies described above adopted technical scheme:
A kind of degradable shape memory rib internal fixtion body, is made up of with the blunt nosed cone head being positioned at main part two ends the main part with some barbs, it is characterized in that:
Described fixed body is made up of biodegradable shape memory macromolecule composite material, and its phase transition temperature is higher than Medical refrigerator refrigerated storage temperature and lower than normal human's body temperature;
When the temperature of described fixed body is lower than phase transition temperature, described fixed body remains on the temporary shapes of shape memory; After in the pulp cavity that described fixed body inserts rib, its temperature is elevated to more than phase transition temperature, and described fixed body is subject to thermal stimulus, is automatically returned to the original shape of shape memory from temporary shapes;
The fixed body being in temporary shapes is rendered as that outer surface is smooth, two ends with the column of blunt nosed cone head, can insert in the pulp cavity of rib by fracture site smoothly; The main part extension elongation of described fixed body, its radial dimension is contracted to the pulp cavity internal diameter being less than fracture site; Described barb is rounding state, entirely attaches to the outer surface of main part, and the many agnails at main part two ends close up, and form the head of blunt nosed taper;
The fixed body being in original shape is rendered as outer surface with barb, two ends with the column of the agnail of upholding to periphery, described barb and agnail thrust the pulp cavity inwall of rib simultaneously, and the rib of fracture site both sides is fixedly secured the two ends at main part; Under the restoring force effect of shape memory effect, described barb stretches out main part outer surface, the split head at main part two ends is the many agnails of upholding to periphery, the main part expanded radially of described fixed body contraction in length, and the rib of traction fracture site both sides is adjacent to each other and firmly close up.
The one preferably technical scheme of degradable shape memory rib internal fixtion body of the present utility model, respectively has 2 ~ 8 barbs, is distributed in the outer surface of main part near head at the two ends of described main part, form the junction point that automatically can thrust rib pulp cavity inwall.
The better technical scheme of one of degradable shape memory rib internal fixtion body of the present utility model, it is characterized in that described main part is designed to solid or hollow structure, its cross section is circular, ellipse, rectangle or polygon, to meet mechanical requirements or the shape memory function requirement of Fracture internal fixaiion.
The beneficial effects of the utility model are:
1, degradable shape memory rib internal fixtion body of the present utility model, utilize shape memory effect to realize the internal fixtion of fracture site, be connected firmly and be not easily shifted, implantation surgery is easy and simple to handle, without the need to particular surgical instrument, can reduce medical treatment cost.
2, degradable shape memory rib internal fixtion body of the present utility model, the restoring force of shape memory effect is relied on firmly to close up fracture site, suture is not needed to reinforce, both union of fracture can not be affected because suture affects the blood confession of periosteum, the intercostal nerves pressurized of rib lower edge can be avoided again to cause postoperative pain, alleviate patient suffering.
3, degradable shape memory rib internal fixtion body of the present utility model adopts biodegradable macromolecular material to make, can degraded and absorbed gradually, need not take out by second operation, does not affect later stage breast CT, MRI checks.
Accompanying drawing explanation
Fig. 1 is the temporary shapes schematic diagram of degradable shape memory rib internal fixtion body of the present utility model;
Fig. 2 is the original shape schematic diagram of degradable shape memory rib internal fixtion body of the present utility model;
Fig. 3 is the using state schematic diagram of degradable shape memory rib internal fixtion body of the present utility model.
In figure, 1-main part, 2-head, 21-agnail, 3-barb, 4-rib, 5-fracture site.
Detailed description of the invention
In order to technique scheme of the present utility model can be understood better, describe in detail further below in conjunction with drawings and Examples.
Degradable shape memory rib internal fixtion body of the present utility model, be made up of with the blunt nosed cone head 2 being positioned at main part 1 two ends the main part 1 with some barbs, be made up of with the blunt nosed cone head 2 being positioned at main part 1 two ends the main part 1 with some barbs, as depicted in figs. 1 and 2;
Described fixed body is made up of biodegradable shape memory macromolecule composite material, and its phase transition temperature Ttrans is higher than Medical refrigerator refrigerated storage temperature and lower than normal human's body temperature;
When the temperature of described fixed body is lower than phase transition temperature Ttrans, described fixed body remains on temporary shapes (Temporary Shape); After in the pulp cavity that described fixed body inserts rib 4, its temperature is elevated to more than phase transition temperature Ttrans, and described fixed body is subject to thermal stimulus, automatically reverts to the original shape (Initial Shape) of shape memory;
The fixed body being in temporary shapes is rendered as that outer surface is smooth, two ends with the column of blunt nosed cone head, can insert in the pulp cavity of rib 4 by fracture site 5 smoothly; Main part 1 extension elongation of described fixed body, its radial dimension is contracted to the pulp cavity internal diameter being less than fracture site, and described barb 3, in rounding state, entirely attaches to the outer surface of main part 1, the many agnails 21 at main part 1 two ends close up, and form the head 2 of blunt nosed taper; As shown in Figure 1;
The fixed body being in original shape is rendered as outer surface with barb 3, two ends with the column of the agnail 21 of upholding to periphery, described barb 3 and agnail 21 thrust the pulp cavity inwall of rib 4 simultaneously, fixedly secure at the two ends of main part 1 by the rib 4 of fracture site 5 both sides; Under the restoring force effect of shape memory effect, described barb 3 stretches out main part 1 outer surface, the head 2 at main part 1 two ends is split into the many agnails 21 of upholding to periphery, main part 1 expanded radially of described fixed body contraction in length, the rib 4 of traction fracture site 5 both sides is adjacent to each other and firmly close up, as shown in Figures 2 and 3.
According to the embodiment of degradable shape memory rib internal fixtion body of the present utility model, respectively there are 2 ~ 8 barbs 3 at the two ends of described main part 1, are distributed in the outer surface of main part 1 near head 2, form the junction point that automatically can thrust rib 4 pulp cavity inwall.In Fig. 1 ~ 2, respectively there are 4 barbs 3 at the two ends of main part 1, form the junction point that 4 thrust rib 4 pulp cavity inwall in the both sides of fracture site 5 respectively, see the rib 4 represented with double dot dash line in Fig. 3 and fracture site 5.
According to the embodiment of degradable shape memory rib internal fixtion body of the present utility model, described main part 1 is designed to solid or hollow structure, its cross section is circular, ellipse, rectangle or polygon, to meet mechanical requirements or the shape memory function requirement of Fracture internal fixaiion.
According to the embodiment of degradable shape memory rib internal fixtion body of the present utility model, the phase transition temperature Ttrans of described biodegradable shape memory macromolecule composite material is 25 ~ 35 DEG C, can freeze in Medical refrigerator and keep temporary shapes, and under body temperature, automatically reply original shape inserting after in body.
According to an embodiment of degradable shape memory rib internal fixtion body of the present utility model, described biodegradable shape memory macromolecule composite material is the thermotropic shape-memory polymer (Thermo-induced shape memory polymers) that the copolymer of octadecyl acrylate and methacrylate is made.
According to another embodiment of degradable shape memory rib internal fixtion body of the present utility model, described biodegradable shape memory macromolecule composite material is the polylactic acid-based composite thermotropic type shape-memory polymer that polylactic acid and hexamethylene diisocyanate (HDI), BDO (BDO) block polymerization obtain.
The embodiment of degradable shape memory rib internal fixtion body using method of the present utility model:
First, the thermotropic shape-memory polymer (Thermo-induced shape memory polymers) utilizing biodegradable macromolecular material to make, according to the size of different parts rib medullary cavity, make the degradable shape memory rib internal fixtion body of different model, its original shape (Initial Shape) as shown in Figure 2.
Perform the Preoperative Method of rib internal fixtion body implantation, the diastatic fracture broken ends of fractured bone 5, and according to the medullary cavity internal drilling of size in both sides of medullary cavity, select the degradable shape memory rib internal fixtion body of suitable model, be heated more than the phase transition temperature (Ttrans) that can apply stress deformation in vitro, applying stress makes it change to the temporary shapes (Temporary Shape) shown in Fig. 1: closed up by the many agnails 21 at main part 1 two ends, form the head 2 of blunt nosed taper; Stretched by main part 1 and make its extension, its radial dimension is contracted to the pulp cavity internal diameter being slightly smaller than fracture site, applies pressure simultaneously and makes the smooth outer surface being affixed to main part 1 of all barbs 3; Main part 1 is bent to the arc consistent with rib 4 fracture site.Subsequently the rib internal fixtion body being deformed into temporary shapes is cooled to rapidly the low-temperature space of below Ttrans, make its Cryopreservation be distortion after temporary shapes.
Then, two the broken ends of fractured bone rapidly fixed body saving as temporary shapes being implanted fracture are also temporarily fixing, temperature to be fixed arrives at temperature in body, fixed body is returned to original shape, that is: the radial automatic expansion of main part 1 of fixed body is returned to the radial dimension of original shape, the head 2 at two ends splits into the many agnails 21 of upholding to periphery, thrust the pulp cavity inwall of rib 4, simultaneously, the barb 3 at main part 1 two ends stretches out main part 1 outer surface, thrust the pulp cavity inwall of rib 4, the rib 4 of fracture site 5 both sides is under the combined effect of agnail 21 and barb 3, fixedly secure the two ends at main part 1, meanwhile, described main part 1 shortens the length being returned to original shape vertically, and under the restoring force traction of shape memory effect, the rib 4 of fracture site 5 both sides is adjacent to each other and firmly close up.Fracture site 5 is fixed to be not easily shifted, and does not need suture reinforce fractured end, can not affect union of fracture, the intercostal nerves pressurized of rib lower edge also can not be caused to cause postoperative pain because suture affects the blood confession of periosteum.After fracture site 5 heals, degradable shape memory rib internal fixtion body of the present utility model can degraded and absorbed gradually, need not take out by second operation, absorbs potruncus CT, MRI and check without impact.
Those of ordinary skill in the art will be appreciated that; above embodiment is only used to the technical solution of the utility model is described; and be not used as restriction of the present utility model; any the above embodiment is done based on connotation of the present utility model change, modification, all will drop in the protection domain of claim of the present utility model.
Claims (3)
1. a degradable shape memory rib internal fixtion body, is made up of with the blunt nosed cone head being positioned at main part two ends the main part with some barbs, it is characterized in that:
Described fixed body is made up of biodegradable shape memory macromolecule composite material, and its phase transition temperature is higher than Medical refrigerator refrigerated storage temperature and lower than normal human's body temperature;
When the temperature of described fixed body is lower than phase transition temperature, described fixed body remains on the temporary shapes of shape memory; After in the pulp cavity that described fixed body inserts rib, its temperature is elevated to more than phase transition temperature, and described fixed body is subject to thermal stimulus, is automatically returned to the original shape of shape memory from temporary shapes;
The fixed body being in temporary shapes is rendered as that outer surface is smooth, two ends with the column of blunt nosed cone head, can insert in the pulp cavity of rib by fracture site smoothly; The main part extension elongation of described fixed body, its radial dimension is contracted to the pulp cavity internal diameter being less than fracture site; Described barb is rounding state, entirely attaches to the outer surface of main part, and the many agnails at main part two ends close up, and form the head of blunt nosed taper;
The fixed body being in original shape is rendered as outer surface with barb, two ends with the column of the agnail of upholding to periphery, described barb and agnail thrust the pulp cavity inwall of rib simultaneously, and the rib of fracture site both sides is fixedly secured the two ends at main part; Under the restoring force effect of shape memory effect, described barb stretches out main part outer surface, the split head at main part two ends is the many agnails of upholding to periphery, the main part expanded radially of described fixed body contraction in length, and the rib of traction fracture site both sides is adjacent to each other and firmly close up.
2. degradable shape memory rib internal fixtion body according to claim 1, respectively has 2 ~ 8 barbs, is distributed in the outer surface of main part near head at the two ends of described main part, forms the junction point that automatically can thrust rib pulp cavity inwall.
3. degradable shape memory rib internal fixtion body according to claim 1, it is characterized in that described main part is designed to solid or hollow structure, its cross section is circular, ellipse, rectangle or polygon, to meet mechanical requirements or the shape memory function requirement of Fracture internal fixaiion.
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| CN201520021696.6U CN204500924U (en) | 2015-01-13 | 2015-01-13 | A kind of degradable shape memory rib internal fixtion body |
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| CN201520021696.6U CN204500924U (en) | 2015-01-13 | 2015-01-13 | A kind of degradable shape memory rib internal fixtion body |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105832392A (en) * | 2015-01-13 | 2016-08-10 | 上海市同济医院 | Degradable shape memory rib internal fixing body |
| CN108289699A (en) * | 2015-10-27 | 2018-07-17 | K·A·卡普隆 | From compression implantation material |
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2015
- 2015-01-13 CN CN201520021696.6U patent/CN204500924U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105832392A (en) * | 2015-01-13 | 2016-08-10 | 上海市同济医院 | Degradable shape memory rib internal fixing body |
| CN108289699A (en) * | 2015-10-27 | 2018-07-17 | K·A·卡普隆 | From compression implantation material |
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