CN205019150U - Pressurization intramedullary nail - Google Patents
Pressurization intramedullary nail Download PDFInfo
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- CN205019150U CN205019150U CN201520667387.6U CN201520667387U CN205019150U CN 205019150 U CN205019150 U CN 205019150U CN 201520667387 U CN201520667387 U CN 201520667387U CN 205019150 U CN205019150 U CN 205019150U
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- intramedullary nail
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Abstract
The utility model relates to the technical field of medical equipment, specifically be a pressurization intramedullary nail, its front end is the head, the middle somatic part that is, and the rear end is the afterbody, the intramedullary nail is cylindric structure, and cross section diameter pretext portion to the afterbody of this intramedullary nail evenly scales up, be equipped with the gaining twist on the somatic part, the concrete structure of the screw tooth form of this gaining twist is: the both sides waist is outside bellied optimalarc, and the cusp is the plane. The beneficial effects of the utility model are that, after the reduction of the fracture, this pressurization intramedullary nail is advancing to follow closely the in -process, can produce to last pressor effect to the fracture line. Because this pressurization intramedullary nail's screw tooth form both sides waist be that outside bellied optimalarc, cusp are the plane, has certain thickness, consequently, the cutting has the stronger power of controlling when getting into the sclerotin, be favorable to the wrong income of screw, difficult rupture, and implement the pressurization back that restores to the throne to the fracture piece accomplishing, it is can effective antagonism rotatory, extract and surely go out stress, increase the fracture and hold stablely, do benefit to the union.
Description
Technical field
This utility model relates to technical field of medical instruments, specifically a kind of compress intramedullary nail.
Background technology
Absorbable compress intramedullary nail used is clinically divided into full thread Absorbable rod compress intramedullary nail and half-thread Absorbable rod compress intramedullary nail two kinds usually at present, the shape and structure of these two kinds of compress intramedullary nails is similar to common metal intramedullary pin, when fixing for fracture site, exist following not enough: 1, the pitch of screw thread is identical, when sclerite is cascaded by intramedullary pin, due to insufficient pressure between sclerite, therefore closely can not be affixed between sclerite, be unfavorable for that fracture site makes up as early as possible; 2, the degradation process of Absorbable rod intramedullary pin is slower, the time be generally present between bone is 12 ~ 18 months, and the afterbody of intramedullary pin is often stayed outside cortical bone, although its afterbody is thinner, but at the fracture site that the such as skin soft tissue such as medial and lateral malleolus fracture is thinner, because the bulge-structure of intramedullary pin afterbody will carry out Long contact time with skin, often the aseptic inflammation of skin soft tissue is caused to react because of the local sour environment produced in intramedullary pin degradation process; 3, for the fracture of some short tubular bones, as outer fracture of ankle, clavicular fracture, the Absorbable rod intramedullary pin of conventional shape structure cannot be applied to this.
Meanwhile, due to current orthopedics clinic practice the most widely intramedullary pin internal fixation material be usually made up of metal material, and there is following distinct disadvantage in the inside-fixture that metal material is made: 1, electrolysis corrosion in vivo, and produce particles interfere surrounding tissue; 2, rigidity is excessive, produces stress shielding, is unfavorable for union of fracture; 3, stop x-ray, interference NMR (Nuclear Magnetic Resonance)-imaging, is unfavorable for clinical follow; 4, in most cases, need to carry out second operation to be taken out by the inside-fixture in patient body, add the chance that the various complication such as infection occur, bring painful psychology frightened to patient; And for old people, after taking out inside-fixture, easy refracture.
Application number is " 201420379119.X ", Authorization Notice No. is " CN203988326U ", name is called that the Chinese utility model patent of " a kind of cannulated compression screw " discloses a kind of cannulated compression screw, for the column structure of axial hollow, the appearance full width of described screw is provided with the screw thread of displacement, and screw tail end is provided with the hidden type notch coordinating with external instrument and connect.In this utility model, the so-called tooth that becomes is apart from diminishing gradually in fact espespecially in screw tail end place's ridge distance, and the width shape of screw thread changes slightly.The tooth of screw thread on described screw at screw front end, middle part is apart from remaining unchanged, at screw tail end, place diminishes suddenly, screw front end may be caused, the insufficient pressure between the sclerite connected in middle part, laminating be not tight, and enter nail dynamics need increase suddenly in the later stage, add operator's operation easier.
Application number is " 201220217226.3 ", Authorization Notice No. is " CN202714915U ", name is called that the Chinese utility model patent of " bone screw " discloses a kind of bone screw, comprise shank of screw and screw cap, described shank of screw is made up of shank of screw root and shank of screw front end, the diameter of shank of screw root is greater than the diameter of shank of screw front end, shank of screw root is identical with the thread rotary orientation of shank of screw front end, and becomes large gradually from shank of screw root to the pitch of the screw thread of shank of screw front end.In this utility model, described bone screw comprises shank of screw and screw cap two parts, entering in the fixing process of nail, this screw cap can stay the region outside cortical bone, fracture site as thinner in the skin soft tissue such as fracture of ankle outside, due to the long-time projection contacts skin of screw cap, easily cause the aseptic inflammation of skin soft tissue to react, and this structure is not suitable for the fracture of the short tubular bones such as outer fracture of ankle, clavicular fracture.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, provides one to have pressurization preferably, go out effect to anti-rotation, resistance to plucking, and possesses degradability simultaneously, and the compress intramedullary nail of dynamic monitoring intramedullary pin absorption process.
In order to achieve the above object, this utility model provides a kind of compress intramedullary nail, and its front end is head, and centre is body, and rear end is afterbody, and described intramedullary pin is cylindrical-shaped structure, the cross-sectional diameter of this intramedullary pin by head to afterbody uniform increments;
Described body is provided with gaining twist, and the concrete structure of the form of thread of this gaining twist is: both sides waist is the arc line shaped of outwardly convex, and cusp is plane;
The pitch of described gaining twist is by head to afterbody uniform increments, and the height of gaining twist is evenly successively decreased to afterbody by head;
The end face of described head is provided with interior hexagonal groove;
Described afterbody is that passivity is coniform.
Preferably, the pitch of described gaining twist is that 0.1mm increases progressively by head to afterbody.
Preferably, the cross-sectional diameter of described head is 6.5 ~ 7.5mm, and the cross-sectional diameter of afterbody is 4.0 ~ 5mm; The length of described body is 30 ~ 60mm.
Optimally, the cross-sectional diameter of described head is 7mm, and the cross-sectional diameter of afterbody is 4.5mm; The length of described body is 45mm.
Preferably, described compress intramedullary nail can be used for the treatment as the tubular bone fracture such as fracture of metacarpal bone and phalanges of fingers, clavicular fracture.
The beneficial effects of the utility model are, described body is provided with gaining twist, and namely the side surface of compress intramedullary nail is coated with helicitic texture completely.After the reduction of the fracture, squeeze into described compress intramedullary nail, due to the cross-sectional diameter of described compress intramedullary nail by head to afterbody uniform increments, make this compress intramedullary nail enter in nail process, the effect to fracture line persistent pressure can be produced.Form of thread both sides waist due to this compress intramedullary nail is the arc line shaped of outwardly convex, cusp is plane, there is certain thickness, therefore when cutting and entering sclerotin, there is stronger hold, be conducive to being screwed into of screw, not frangibility, and sclerite being implemented after loaded reset completing, can effectively to anti-rotation, extract and cut out stress, increase fracture end stability, be beneficial to union of fracture.The cone shape head of described passivity is beneficial to screw and is screwed into; The interior hexagonal groove of described afterbody makes the contact area of screwdriver and tail end face larger, is screwed in process and is not easy stripped thread.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Wherein:
1-head 2-body 3-afterbody
4-gaining twist
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, this utility model is described further.
Embodiment 1:
A kind of compress intramedullary nail as shown in Figure 1, its front end is head 1, and centre is body 2, and rear end is afterbody 3, and described intramedullary pin is cylindrical-shaped structure, and the cross-sectional diameter of this intramedullary pin is by head 1 to afterbody 3 uniform increments;
Described body 2 is provided with gaining twist 4, and the concrete structure of the form of thread of this gaining twist 4 is: both sides waist is the arc line shaped of outwardly convex, and cusp is plane;
The pitch of described gaining twist 4 is by head 1 to afterbody 3 uniform increments, and the height of gaining twist 4 is evenly successively decreased by head 1 to afterbody 3;
The end face of described head 1 is provided with interior hexagonal groove;
Described afterbody 3 is coniform in passivity.
The pitch of described gaining twist 4 is increased progressively in 0.1mm by head 1 to afterbody 3.
The cross-sectional diameter of described head 1 is 7mm, and the cross-sectional diameter of afterbody 3 is 4.5mm; The length of described body 2 is 45mm.
Further, described compress intramedullary nail, by lact-acid oligomer (PLA), hydroxyapatite (HA), nanoparticle, polylactic acid, the barium sulfate of surface grafting, adopts blend method synthesis.
Described PLA is that one has excellent biocompatibility and biodegradable polymer, is the class bio-medical material that food and drug administration (FDA) is approved.The weak point of PLA material does not have bone conductibility, and when clinical being used alone, the speed of repairing bone defect is very slow.Especially for larger bony defect, be only difficult to realize complete Bone Defect Repari with polymer, and this kind of material only has the initial mechanical modulus of middle intensity, can not as the bone fracture internal fixation material of bearing position; And its early stage biodegradation rate is very fast, to such an extent as to cannot meet the mechanical property requirements before new bone growth out;
HA is the main inorganic composition of body bone tissue, accounts for more than 70% of body bone tissue.The HA bioceramic of synthetic is similar due to its stuctures and properties and natural HA's, and has good biocompatibility and bone conduction is active, is therefore widely used in the reparation of bone injury; But HA bioceramic organizational project application in exist fragility large, frangible, not easily machine-shaping and degeneration difference etc. defect;
Porous PLA/HA composite PLA and HA compound developed can improve the toughness of material on the one hand, meets the requirement of mechanical strength that bone implants substitution material; On the other hand, neutralize its acid degradation products, delay material premature degradation, improve material synosteosis ability and biocompatibility.Meanwhile, the osteoinductive of HA can provide good bone cell growth environment, and loose structure then provides condition for Growth of Cells, tissue regeneration and vascularization, and PLA/HA composite has good biocompatibility and osteoconductive potential;
Barium sulfate makes described compress intramedullary nail have can developability.
Described compress intramedullary nail can be used for the treatment as the tubular bone fracture such as fracture of metacarpal bone and phalanges of fingers, clavicular fracture.
Below the preferred embodiment that this utility model is created is illustrated, but this utility model is created and is not limited to described embodiment, those of ordinary skill in the art can also make all equivalent modification or replacement under the prerequisite without prejudice to this utility model creative spirit, and these equivalent modifications or replacement are all included in the application's claim limited range.
Claims (4)
1. a compress intramedullary nail, its front end is head (1), centre is body (2), rear end is afterbody (3), it is characterized in that: described intramedullary pin is cylindrical-shaped structure, the cross-sectional diameter of this intramedullary pin by head (1) to afterbody (3) uniform increments;
Described body (2) is provided with gaining twist (4), and the concrete structure of the form of thread of this gaining twist (4) is: both sides waist is the arc line shaped of outwardly convex, and cusp is plane;
The pitch of described gaining twist (4) is by head (1) to afterbody (3) uniform increments, and the height of gaining twist (4) is evenly successively decreased to afterbody (3) by head (1);
The end face of described head (1) is provided with interior hexagonal groove;
Described afterbody (3) is coniform in passivity.
2. compress intramedullary nail according to claim 1, is characterized in that: the pitch of described gaining twist (4) is increased progressively in 0.1mm to afterbody (3) by head (1).
3. compress intramedullary nail according to claim 1 and 2, is characterized in that: the cross-sectional diameter of described head (1) is 6.5 ~ 7.5mm, and the cross-sectional diameter of afterbody (3) is 4.0 ~ 5mm; The length of described body (2) is 30 ~ 60mm.
4. compress intramedullary nail according to claim 1 and 2, is characterized in that: the cross-sectional diameter of described head (1) is 7mm, and the cross-sectional diameter of afterbody (3) is 4.5mm; The length of described body (2) is 45mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520667387.6U CN205019150U (en) | 2015-08-31 | 2015-08-31 | Pressurization intramedullary nail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520667387.6U CN205019150U (en) | 2015-08-31 | 2015-08-31 | Pressurization intramedullary nail |
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| Publication Number | Publication Date |
|---|---|
| CN205019150U true CN205019150U (en) | 2016-02-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520667387.6U Active CN205019150U (en) | 2015-08-31 | 2015-08-31 | Pressurization intramedullary nail |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108852488A (en) * | 2018-07-10 | 2018-11-23 | 西安卓恰医疗器械有限公司 | A kind of medical internal fixing peg for fracture and medical fracture setting tool |
| CN113367856A (en) * | 2021-05-22 | 2021-09-10 | 北京力达康科技有限公司 | Calcaneus prosthesis |
| CN113662647A (en) * | 2020-05-15 | 2021-11-19 | 北京中安泰华科技有限公司 | Clavicle automatic pressurizing intramedullary nail with lock |
-
2015
- 2015-08-31 CN CN201520667387.6U patent/CN205019150U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108852488A (en) * | 2018-07-10 | 2018-11-23 | 西安卓恰医疗器械有限公司 | A kind of medical internal fixing peg for fracture and medical fracture setting tool |
| CN113662647A (en) * | 2020-05-15 | 2021-11-19 | 北京中安泰华科技有限公司 | Clavicle automatic pressurizing intramedullary nail with lock |
| CN113367856A (en) * | 2021-05-22 | 2021-09-10 | 北京力达康科技有限公司 | Calcaneus prosthesis |
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