CN103315797A - Reamer for preventing looseness of bone cement artificial joint prosthesis stem - Google Patents
Reamer for preventing looseness of bone cement artificial joint prosthesis stem Download PDFInfo
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- CN103315797A CN103315797A CN2013102348927A CN201310234892A CN103315797A CN 103315797 A CN103315797 A CN 103315797A CN 2013102348927 A CN2013102348927 A CN 2013102348927A CN 201310234892 A CN201310234892 A CN 201310234892A CN 103315797 A CN103315797 A CN 103315797A
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- blade
- cutter
- reamer
- cutter shell
- expanding device
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Abstract
The invention provides a reamer for preventing looseness of a bone cement artificial joint prosthesis stem. The reamer is of a sleeve-shaped structure and comprises a cutter shell, a cutter, a blade and a spring piece. The cutter shell and the cutter relatively rotate, so that a cutting edge pops out of a side hole of the cutter shell to perform reaming and slides into the cutter shell to pull out and detach the reamer, the reamer is convenient to use, the problems that the cutter is jammed after reaming, the reamer cannot be pulled out and the like are avoided, and surgical efficiency is improved. The reamer can be used for performing local and transverse reaming in a marrow cavity, a groove is bored in the inner wall of the marrow cavity, bone cement can permeate into the groove in a surgery, and pullout resistance and looseness resistance of a bone cement sheath are enhanced. The length of the cutting edge on the blade of the reamer can be adjusted according to the thickness of bone cortex measured in advance, and the problems that fracture risk is caused by too deep reaming or reaming purposes cannot be achieved due to too shallow reaming and the like are avoided.
Description
Technical field
The present invention relates to a kind of marrow expanding device, relate in particular to a kind of marrow expanding device that prevents that bone-cement type artificial joint prosthesis handle is loosening.
Background technology
The joint is the hinge of human motion, since wound or pathological changes, possibility " scrapping ", and at this moment the doctor often will " scrap " arthrectomy, change artificial joint.Human synovial is the great-hearted organ of tool, and the artificial joint of changing all is unvital prosthese.Such as dead Dai Sheng how, " what is said in fun is fulfilled in earnest " firmly connects both, just and keep with the passage of time also that loosening doctor wants to invent a kind of special material, be used for fixing specially artificial joint.Through for many years research, bone cement came out finally in early 1960s.Bone cement is a kind of medical material for bone surgery, because its part physical property and solidify rear outward appearance and character quite as the white cement of building, finishing usefulness, popular title like this has just been arranged, and its main component is polymethyl methacrylate, is mainly used in prosthetic replacement's operation.Put down in writing for " practical orthopaedics and tranmstology " 2088 pages: bone cement, bone cement by name commonly used, chemistry acrylic cement (acrylic cement) by name, polymethyl methacrylate (polymethyl methacrylic, PMMA).Nineteen fifty-one, Sweden Klaer uses PMMA as the hip prosthesis immobilization material; Charnley further investigation in 1988 is also promoted the use of, thereby the displacement of bone cement fixed fae body is succeeded.China succeeded in developing and application and clinical in 1978.
Because the practicality of bone cement, people conduct in-depth research it, and multiple improvement has been carried out in its application.Disclose a kind of high crushing resistance such as CN2860407U and contained the antibiotic-loaded bone cement artificial joint, be applicable to the two-stage reconstruction operations that the hip joint deep infection is implemented, its crushing resistance is much better than existing granular bone cement artificial joint, can significantly improve treatment hip joint deep infection success rate of operation, effectively solve the seriously sequela such as loose of soft tissue torsional deformation that traditional treatment occurs and sclerotin.And for example CN201668539U discloses a kind of bone cement fixing type double-equator dislocation prevention acetabular prosthesis, adopt the structure in two equator, to the encirclement size of bulb greater than its radius, the surface of the two rotation that matches is strengthened, still be the sphere cooperation in easy dislocation part, can play better preventing that bulb from deviating from the effect of acetabular bone.
Generally in the medullary cavity as to want implanting prosthetic all be that bone cement is inserted in the smooth medullary cavity to obtain a smooth straight barrel, and rely on and stick to prosthese and medullary cavity inwall about it.Analyze from the cross section body, its location that can only finish X and Y both direction of this straight barrel adheres to, and in the Z-direction reliable detent force of neither one then, causes thus the faying face at prosthesis handle bone and bone cement interface that obvious defective is arranged.So that interlocking power is poor easily cause loosening.How to break through conventional means, how to adopt not only ideal but also reliably advanced way be used as current clinical operation and become a urgent direction.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency, a kind of marrow expanding device that prevents that bone-cement type artificial joint prosthesis handle is loosening is provided, can in pulp cavity, carry out partial lateral and expand marrow, go out groove in the boring of medullary cavity inwall, during operation, bone cement can penetrate in the groove, and increase bone cement sheath resistance to plucking goes out, the effect of loosing prevention.
The invention provides a kind of marrow expanding device that prevents that bone-cement type artificial joint prosthesis handle is loosening, comprise cutter shell, cutter hub, blade and spring leaf;
Described cutter shell is hollow structure;
Described cutter hub is positioned at described cutter shell, and described cutter hub is provided be used to the groove that holds blade and spring leaf;
Described blade is provided with at least one protuberance, on the protuberance with blade;
Blade and spring leaf are installed in the described groove, on described spring leaf and the blade back to a side contacts of described blade;
The length of protuberance is greater than the thickness of cutter shell wall, and described cutter shell wall is provided with the side opening of allowing that blade ejects.
Wherein, described groove can be groove, also can be the through hole that runs through cutter hub.
Preferably, the front side of described blade is cambered surface.
Preferably, the dorsal part of described blade is plane or the concave surface perpendicular to cutter hub.
Preferably, described blade is at least two, such as three, four, five or six etc.
Preferably, described blade is 1-5.
Preferably, correspondingly be provided with at least one group of side opening of allowing that blade ejects on the described cutter shell wall, wherein the quantity of at least one group side opening equates with the quantity of blade.
Wherein, the size of each blade can be identical, can be not identical yet, and the distance between every adjacent two blades can be identical, also can be not identical.
Preferably, described spring leaf is arc, and its two ends contact with blade.
Preferably, a side curved structure relative with described blade on the described blade, the radian of spring leaf is greater than the radian of the arcuate structure of blade.
Preferably, the two ends of described spring leaf contact with blade, and the arcwall face of spring leaf and the arcuate structure of blade are in the same way.
Preferably, the width of described spring leaf is greater than the thickness of described blade.
Preferably, the long 0.5-10mm of thickness of the Length Ratio cutter shell wall of described blade.
Preferably, the tail end of described cutter shell and cutter hub is established respectively holding assembly.
Preferably, described holding assembly is handle.
Wherein, the material of described cutter shell, cutter hub, blade and spring leaf is the metal that meets medical standard, and for example, cutter shell and cutter hub can be rustless steel (1Cr18Ni9Ti) etc., blade can be high-speed steel (W18Cr4V) etc., and spring leaf can be manganese steel (65Mo) etc.
Because varying in size of intramedullary canal, marrow expanding device of the present invention can be designed to different large ting models according to the practical application needs.
Wherein, described cutter shell external diameter preferably is less than or equal to 14cm.
Compared with prior art, marrow expanding device of the present invention has the following advantages:
1, this marrow expanding device adopts the cannula-like structure, comprises cutter shell, cutter hub, blade and spring, and simple in structure, cost is low.
2, this marrow expanding device is by the relative rotation of cutter shell and cutter hub, can reach blade and from the cutter shell, eject and expand marrow and slide into the purpose that the cutter shell is extracted marrow expanding device and dismounting marrow expanding device, easy to use, avoid causing and expand swaging clamp behind the marrow, the problems such as marrow expanding device can pull out out improve operation efficient.
3, this marrow expanding device can carry out partial lateral and expand marrow in pulp cavity, goes out groove in the boring of medullary cavity inwall, goes out groove in the boring of medullary cavity inwall, and during operation, bone cement can penetrate in the groove, and increase bone cement sheath resistance to plucking goes out, the effect of loosing prevention.The degree of depth of the groove that produces can be regulated by the length of adjusting blade.
4, can be according to the prior thickness of having measured cortical bone, adjust the edge length on the blade, avoid causing that expanding marrow causes risk of bone fracture or expand marrow excessively shallow excessively deeply, do not reach problems such as expanding the marrow purpose.
Description of drawings
Fig. 1 is that the blade of marrow expanding device of the present invention slips into rear schematic diagram;
Fig. 2 is schematic diagram after the blade of marrow expanding device of the present invention ejects;
Fig. 3 is cutter shell structure schematic diagram of the present invention;
Fig. 4 is structure of the cutter body schematic diagram of the present invention;
Fig. 5 is blade structure schematic diagram of the present invention;
Fig. 6 is chip architecture of the spring schematic diagram of the present invention;
Fig. 7 is the structural representation after blade of the present invention and spring leaf are installed on the cutter hub;
Fig. 8 is the side view of blade of the present invention;
Fig. 9 is the cutaway view after the blade of marrow expanding device of the present invention ejects.
The specific embodiment
With reference to the accompanying drawings, in conjunction with specific embodiments the present invention is further described, to understand better the present invention.
With reference to Fig. 1-9, the described a kind of marrow expanding device be used to preventing that bone-cement type artificial joint prosthesis handle is loosening of the present embodiment comprises cutter shell 1, cutter hub 2, blade 3 and spring leaf 4.
With reference to Fig. 5 and Fig. 8, blade 3 thickness are 2.5mm, and three protuberances are arranged on blade one side, with blade 31, edge length is 4mm on the protuberance, and the front side is cambered surface, dorsal part is the plane, and the blade spacing is 20mm, and the opposite side relative with described blade is arcuate structure on the blade.
With reference to Fig. 6, the width of spring leaf 4 is 3.5mm, curved structure, as shown in Figure 6, its radian is greater than the radian of the arcuate structure of blade 3, and the formation fulcrum is turned up at spring leaf 4 two ends, contact with the two ends of blade 3, the arcuate structure of the arcwall face of spring leaf 4 and blade 3 in the same way.
With reference to Fig. 3, cutter shell 1 is hollow tubular structure, respectively there are three side openings 11 of allowing that blade 31 ejects both sides, cutter shell 1 stage casing, side opening 11 equal and opposite in directions, the hole is square, and length and width are 4mm, pitch of holes is 20mm, side opening 11 is three point Linears to be arranged, and the tail end of cutter shell 1 is provided with T handle 12(handle and stretches out from cutter shell tail end both sides, becomes the T font with the cutter hull shape).
With reference to Fig. 4, cutter hub 2 is cylindrical structure, and diameter of section is 11mm, in the middle of the cylinder rectangular through hole 22 is arranged, and through hole 22 runs through whole cylinder, and the tail end of cutter hub 2 is provided with L handle 21(handle and stretches out from cutter hub tail end one side, becomes the L font with the cutter hull shape).
Described above-mentioned four assembling parts together, according to the own action that will finish, arbitrarily the T shape handle on swivel knife shell and the cutter hub can reach the expansion marrow, extract the purposes such as marrow expanding device and removal of inserts.When blade does not also eject side opening, marrow expanding device is inserted into the pulp cavity certain depth, the dead knife shell is motionless, the rotation cutter hub, aim at when blade in the situation of side opening, blade can under the effect of spring, be ejected by the side opening on the cutter shell, then, according to expanding marrow with the blade cambered surface towards identical direction rotation cutter shell.After expanding marrow and finishing, the dead knife shell is motionless, according to the blade cambered surface towards identical direction rotation cutter hub, blade can slide into the cutter shell because of self globoidal structure, thereby can extract easily marrow expanding device.Equally, after blade slides into the cutter shell, can extract easily cutter hub, the dismounting marrow expanding device can clean cutter hub, blade and spring, and according to the keen edge situation, in time allowing blade replacement more.
Above specific embodiments of the invention are described in detail, but it is just as example, the present invention is not restricted to specific embodiment described above.To those skilled in the art, any equivalent modifications that the present invention is carried out and substituting also all among category of the present invention.Therefore, not breaking away from impartial conversion and the modification of doing under the spirit and scope of the present invention, all should contain within the scope of the invention.
Claims (10)
1. a marrow expanding device that prevents that bone-cement type artificial joint prosthesis handle is loosening is characterized in that, comprises cutter shell, cutter hub, blade and spring leaf;
Described cutter shell is hollow structure;
Described cutter hub is positioned at described cutter shell, and described cutter hub is provided be used to the groove that holds blade and spring leaf;
Described blade is provided with at least one protuberance, on the protuberance with blade;
Blade and spring leaf are installed in the described groove, on described spring leaf and the blade back to a side contacts of described blade;
The length of protuberance is greater than the thickness of cutter shell wall, and described cutter shell wall is provided with the side opening of allowing that blade ejects.
2. marrow expanding device according to claim 1 is characterized in that, the front side of described blade is cambered surface.
3. marrow expanding device according to claim 2 is characterized in that, the dorsal part of described blade is perpendicular to the plane of cutter hub or concave surface.
4. marrow expanding device according to claim 1 is characterized in that, the long 0.5-10mm of thickness of the Length Ratio cutter shell wall of described blade.
5. marrow expanding device according to claim 1 is characterized in that, described blade is 1-5.
6. marrow expanding device according to claim 1 or 5 is characterized in that, correspondingly is provided with at least one group of side opening of allowing that blade ejects on the described cutter shell wall, and wherein the quantity of at least one group side opening equates with the quantity of blade.
7. marrow expanding device according to claim 1 is characterized in that, described spring leaf is arc, and its two ends contact with blade.
8. according to claim 1 or 7 described marrow expanding devices, it is characterized in that, described blade is back to the curved structure of a side of described blade, and the radian of spring leaf is greater than the radian of the arcuate structure of blade.
9. according to claim 1 or 7 described marrow expanding devices, it is characterized in that, the width of described spring leaf is greater than the thickness of described blade.
10. marrow expanding device according to claim 1 is characterized in that, the tail end of described cutter shell and cutter hub is established respectively holding assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310234892.7A CN103315797B (en) | 2013-06-14 | 2013-06-14 | Reamer for preventing looseness of bone cement artificial joint prosthesis stem |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310234892.7A CN103315797B (en) | 2013-06-14 | 2013-06-14 | Reamer for preventing looseness of bone cement artificial joint prosthesis stem |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103315797A true CN103315797A (en) | 2013-09-25 |
| CN103315797B CN103315797B (en) | 2015-04-08 |
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| CN201310234892.7A Expired - Fee Related CN103315797B (en) | 2013-06-14 | 2013-06-14 | Reamer for preventing looseness of bone cement artificial joint prosthesis stem |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114506083A (en) * | 2022-01-12 | 2022-05-17 | 南京鼓楼医院 | Manufacturing and using method of marrow expanding direction control mold in hip joint replacement and revision operation |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102112066A (en) * | 2008-07-29 | 2011-06-29 | 德普伊国际有限公司 | Instrument for forming cavity within bone |
| US20120191095A1 (en) * | 2009-05-20 | 2012-07-26 | Keith Burger | Steerable curvable vertebroplasty drill |
| CN202637035U (en) * | 2012-06-07 | 2013-01-02 | 常州百隆微创医疗器械科技有限公司 | Vertebral reamer |
| US20130041377A1 (en) * | 2011-08-09 | 2013-02-14 | Kyle Kuntz | Articulated cavity creator |
-
2013
- 2013-06-14 CN CN201310234892.7A patent/CN103315797B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102112066A (en) * | 2008-07-29 | 2011-06-29 | 德普伊国际有限公司 | Instrument for forming cavity within bone |
| US20120191095A1 (en) * | 2009-05-20 | 2012-07-26 | Keith Burger | Steerable curvable vertebroplasty drill |
| US20130041377A1 (en) * | 2011-08-09 | 2013-02-14 | Kyle Kuntz | Articulated cavity creator |
| CN202637035U (en) * | 2012-06-07 | 2013-01-02 | 常州百隆微创医疗器械科技有限公司 | Vertebral reamer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114506083A (en) * | 2022-01-12 | 2022-05-17 | 南京鼓楼医院 | Manufacturing and using method of marrow expanding direction control mold in hip joint replacement and revision operation |
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| CN103315797B (en) | 2015-04-08 |
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Granted publication date: 20150408 |