CN102697551A - Dynamic locking screw - Google Patents

Dynamic locking screw Download PDF

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Publication number
CN102697551A
CN102697551A CN201210165279XA CN201210165279A CN102697551A CN 102697551 A CN102697551 A CN 102697551A CN 201210165279X A CN201210165279X A CN 201210165279XA CN 201210165279 A CN201210165279 A CN 201210165279A CN 102697551 A CN102697551 A CN 102697551A
Authority
CN
China
Prior art keywords
screw
hold
thread
down screw
threaded sleeve
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.)
Pending
Application number
CN201210165279XA
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Chinese (zh)
Inventor
朱伟强
严丽华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZHEJIANG CANWELL MEDICAL CO Ltd
Original Assignee
ZHEJIANG CANWELL MEDICAL CO Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ZHEJIANG CANWELL MEDICAL CO Ltd filed Critical ZHEJIANG CANWELL MEDICAL CO Ltd
Priority to CN201210165279XA priority Critical patent/CN102697551A/en
Publication of CN102697551A publication Critical patent/CN102697551A/en
Pending legal-status Critical Current

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Abstract

The invention belongs to a medical instrument, in particular to a dynamic locking screw which comprises a fixation screw. The dynamic locking screw is characterized in that a thread casing is arranged outside the fixation screw, and a shaft end of the fixation screw is provided with a structure of a polish rod with an outer thread; a hollow structure with an inner thread is adopted on the inner surface of the thread casing; and the fixation screw and the thread casing are fixed together in a manner that the inner thread is connected with the outer thread to form a dynamic elastic micro motion structure in which the thread casing can move axially along the fixation screw. The invention provides motions nearly parallel to a fracture part for a patient through the dynamic structure in which the thread casing can move axially along the fixation screw, so that the dynamic locking screw has greater potentials to form an annular callus with higher mechanical strength, thereby a quicker and more stable healing process is provided and the formation of asymmetrical poroma is avoided. The dynamic locking screw has the advantages of small wound, simple operation, quick postoperative recovery and the like.

Description

Dynamic lock screw
Technical field
The invention belongs to medical mechanical domain, specifically is a kind of dynamic lock screw.
Background technology
The main biomechanics difference of locking bone fracture plate and conventional steel plates is that the frictional force that the latter depends on bone-steel plate interface is accomplished the pressurization of steel plate to bone; Along with axial dynamic load circulation increases; Screw begins lax and causes frictional force to reduce, and final steel plate is therefore loosening.If it is loosening that steel plate takes place before union of fracture, fracture end will be unstable, finally causes the steel plate fracture.Obtain and keep the fixed place of firm screw (for example metaphysis and osteoporotic epiphysis) more difficult, just the more difficult stability of keeping fracture end.The biomechanics of conventional steel plates makes it to have following biology of defective: the compressing periosteum, influence the fracture end blood supply.So traditional steel plate osteopathy that fixedly secures (for example pressurization and lag screw between sclerite) has quite high complication rate, comprises infection, steel plate fracture, delayed union and disunion.
At present, locking bone fracture plate has become the important apparatus of fractures, yet through this clinical practice in several years recently; Existing locking bone fracture plate is because lock screw is fixed, and drawback also progressively exposes, to many common fracture also and be not suitable for using locking bone fracture plate to treat; And locking bone fracture plate also is difficult to fracture is fully resetted; Especially the special blade plate that has only lock hole must be squeezed into epiphysis in case lock screw sees through blade plate to earlier fracture end being resetted before blade plate is fixing; This epiphysis just can not be adjusted the position through squeezing into modes such as other screw or use pressue device, thereby forms asymmetric callus.Although the locking bone fracture plate advanced technology, cost an arm and a leg, it can not be used for improving and resets, thereby can not promote the union of fracture of malreduction.Therefore it is final fixing too firm to fracture, and particularly when using bridging technology, nonunion might take place.The formation reason of disunion this moment is that firm blade plate+secure lock screw+fracture end separates.
In addition, another clinical problem of often facing is that rigidly fixing of long bone fracture makes that minimum motion is only arranged on cortical bone, therefore can form asymmetric callus.
Summary of the invention
The objective of the invention is in order to overcome the problem that the conventional fixed screw forms easily asymmetric callus, for the patient provide a kind of make agglutination sooner, more stable, low inflexible dynamic lock screw.
The technical scheme that the present invention adopted is:
A kind of dynamic lock screw comprises hold-down screw, it is characterized in that: hold-down screw has a threaded sleeve outward; The hold-down screw axle head is provided with polished rod band external thread structure; The threaded sleeve inner surface adopts the hollow belt female thread structure, the form fix that hold-down screw and threaded sleeve are connected through internal and external threads together, the composition threaded sleeve can be made the dynamic elasticity fine motion structure of axially-movable along hold-down screw; Allow its fine motion within the specific limits; Stable stimulation is provided between fracture end, promotes callus formation, quicken the healing of biological fracture.
Hold-down screw of the present invention is provided with taper thread, and end face is provided with quincunx hole, is beneficial to better torque transfer.
Threaded sleeve outer surface of the present invention is provided with external screw thread, 90 ° of little otch in part that afterbody is provided with five size unanimities and is uniformly distributed with, the convenient bone that inserts fast.
Hold-down screw end of the present invention is provided with circular chamfering, and threaded sleeve inner surface one end is provided with the size rounding bigger than hold-down screw, guarantees the reliability of threaded sleeve along the hold-down screw axially-movable.
The present invention is through the dynamic structure of threaded sleeve along the hold-down screw axially-movable; The motion that almost is parallel to fracture site is provided for the patient; Therefore there are bigger potentiality to form the ring-type callus of higher mechanical strength; Thereby provide sooner, more stable agglutination, avoid the formation of asymmetric callus, have advantages such as wound is little, operation is simple, post-operative recovery is fast.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is that the A of Fig. 1 is to view.
Fig. 3 is that the B of Fig. 1 is to view.
The specific embodiment
Contrast accompanying drawing below, dynamic lock screw of the present invention is further described through enforcement.
As shown in Figure 1; A kind of dynamic lock screw comprises hold-down screw 1, it is characterized in that: a threaded sleeve 2 is arranged outside the hold-down screw 1; Hold-down screw 1 axle head is provided with polished rod band external thread structure; Threaded sleeve 2 inner surfacies adopt the hollow belt female thread structure, the form fix that hold-down screw 1 and threaded sleeve 2 are connected through internal and external threads together, composition threaded sleeve 2 can be made the dynamic elasticity fine motion structure of axially-movable along hold-down screw 1 axle head.
As shown in Figure 2, hold-down screw 1 head of the present invention is provided with taper thread 3, and end face is provided with quincunx hole, is beneficial to better torque transfer.
As shown in Figure 3, threaded sleeve 2 outer surfaces of the present invention are provided with external screw thread, the little otch 4 in 90 ° of parts that afterbody is provided with five size unanimities and is uniformly distributed with, the convenient bone that inserts fast.
Hold-down screw 1 end of the present invention is provided with circular chamfering, and threaded sleeve 2 inner surfacies one end is provided with the size rounding bigger than hold-down screw, guarantees that threaded sleeve 2 makes the reliability of axially-movable along hold-down screw 1.
Dynamic lock screw of the present invention adopts the bio-medical material with elasticity or super-elasticity, good biocompatibility and corrosion resistance to process, and guarantees dynamic lock screw mechanics of system stability.After implanting this dynamic lock screw, can see the accurate position of screw at any time through the mode of X-ray film making, make things convenient for the inspection of postoperative.

Claims (4)

1. dynamic lock screw; Comprise hold-down screw; It is characterized in that: hold-down screw has a threaded sleeve outward, and the hold-down screw axle head is provided with polished rod band external thread structure, and the threaded sleeve inner surface adopts the hollow belt female thread structure; The form fix that hold-down screw and threaded sleeve are connected through internal and external threads is formed the dynamic elasticity fine motion structure that threaded sleeve can be done axially-movable along hold-down screw together.
2. dynamic lock screw according to claim 1 is characterized in that: the hold-down screw head is provided with taper thread, and end face is provided with quincunx hole.
3. dynamic lock screw according to claim 1 and 2 is characterized in that: the threaded sleeve outer surface is provided with external screw thread, 90 ° of little otch in part that afterbody is provided with five size unanimities and is uniformly distributed with.
4. dynamic lock screw according to claim 1 is characterized in that: the hold-down screw axle head is provided with circular chamfering, and threaded sleeve inner surface one end is provided with the size rounding bigger than hold-down screw.
CN201210165279XA 2012-05-24 2012-05-24 Dynamic locking screw Pending CN102697551A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201210165279XA CN102697551A (en) 2012-05-24 2012-05-24 Dynamic locking screw

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201210165279XA CN102697551A (en) 2012-05-24 2012-05-24 Dynamic locking screw

Publications (1)

Publication Number Publication Date
CN102697551A true CN102697551A (en) 2012-10-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201210165279XA Pending CN102697551A (en) 2012-05-24 2012-05-24 Dynamic locking screw

Country Status (1)

Country Link
CN (1) CN102697551A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105193489A (en) * 2015-09-18 2015-12-30 山东康盛医疗器械有限公司 Dynamic-pressurizing-locked bone screw and use method thereof
CN105342685A (en) * 2015-11-19 2016-02-24 江苏百易得医疗科技有限公司 Dynamic locking screw and dynamic locking bone plate system
CN108095816A (en) * 2018-01-25 2018-06-01 北京中安泰华科技有限公司 Square halberd screw

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4716893A (en) * 1985-03-11 1988-01-05 Artur Fischer Bone fastener
CN2460059Y (en) * 2001-01-20 2001-11-21 兰州记忆合金有限公司 Orthopedics external fixation unit
CN101454582A (en) * 2006-05-29 2009-06-10 阿道夫维尔特股份有限公司 Self-drilling screw
EP2105101A1 (en) * 2008-03-28 2009-09-30 BIEDERMANN MOTECH GmbH Bone anchoring device
CN102137627A (en) * 2007-12-17 2011-07-27 新特斯有限责任公司 Dynamic bone fixation element and method of using the same
CN102178557A (en) * 2011-05-12 2011-09-14 上海市第六人民医院 Pelvic internal fixation unit and application thereof
CN202654216U (en) * 2012-05-24 2013-01-09 浙江科惠医疗器械有限公司 Dynamic locking screw

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4716893A (en) * 1985-03-11 1988-01-05 Artur Fischer Bone fastener
CN2460059Y (en) * 2001-01-20 2001-11-21 兰州记忆合金有限公司 Orthopedics external fixation unit
CN101454582A (en) * 2006-05-29 2009-06-10 阿道夫维尔特股份有限公司 Self-drilling screw
CN102137627A (en) * 2007-12-17 2011-07-27 新特斯有限责任公司 Dynamic bone fixation element and method of using the same
EP2105101A1 (en) * 2008-03-28 2009-09-30 BIEDERMANN MOTECH GmbH Bone anchoring device
CN102178557A (en) * 2011-05-12 2011-09-14 上海市第六人民医院 Pelvic internal fixation unit and application thereof
CN202654216U (en) * 2012-05-24 2013-01-09 浙江科惠医疗器械有限公司 Dynamic locking screw

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105193489A (en) * 2015-09-18 2015-12-30 山东康盛医疗器械有限公司 Dynamic-pressurizing-locked bone screw and use method thereof
CN105342685A (en) * 2015-11-19 2016-02-24 江苏百易得医疗科技有限公司 Dynamic locking screw and dynamic locking bone plate system
CN108095816A (en) * 2018-01-25 2018-06-01 北京中安泰华科技有限公司 Square halberd screw

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Application publication date: 20121003