CN110693588A - Jaw tractor capable of preventing rotation - Google Patents
Jaw tractor capable of preventing rotation Download PDFInfo
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- CN110693588A CN110693588A CN201911132335.8A CN201911132335A CN110693588A CN 110693588 A CN110693588 A CN 110693588A CN 201911132335 A CN201911132335 A CN 201911132335A CN 110693588 A CN110693588 A CN 110693588A
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- 238000000034 method Methods 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 9
- 230000000903 blocking effect Effects 0.000 claims description 15
- 238000003780 insertion Methods 0.000 claims description 10
- 230000037431 insertion Effects 0.000 claims description 10
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000011164 ossification Effects 0.000 abstract description 8
- 210000001847 jaw Anatomy 0.000 description 28
- 210000000988 bone and bone Anatomy 0.000 description 9
- 230000014759 maintenance of location Effects 0.000 description 4
- 239000004606 Fillers/Extenders Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 210000004872 soft tissue Anatomy 0.000 description 3
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 206010052428 Wound Diseases 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 238000002316 cosmetic surgery Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 210000004373 mandible Anatomy 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 210000000214 mouth Anatomy 0.000 description 2
- 238000001356 surgical procedure Methods 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 206010010356 Congenital anomaly Diseases 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/60—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like for external osteosynthesis, e.g. distractors, contractors
- A61B17/66—Alignment, compression or distraction mechanisms
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Abstract
A jaw bone tractor preventing rotation comprises a traction frame, a jaw bone tractor and a jaw bone tractor, wherein a guide groove is formed on the traction frame; fixing a traction plate; the movable traction seat is provided with a threaded through hole; the movable traction plate is fixed on the movable traction seat; the screw rod is arranged in the guide groove and can rotate around the axis of the screw rod, the front end of the screw rod forms a driving end, and the screw rod penetrates through the threaded through hole and is in threaded connection with the threaded through hole; the method is characterized in that: the fixing sleeve is sleeved outside the driving end, an unlocking locking structure is arranged between the fixing sleeve and the traction frame, the fixing sleeve can be relatively fixed with the traction frame in a locking state, and the fixing sleeve can rotate around the axis of the fixing sleeve relative to the traction frame in a locking releasing state; and the anti-rotation structure is arranged between the fixed sleeve and the driving end, and can prevent the screw from rotating reversely under the state that the fixed sleeve is fixed relative to the traction frame by the locking structure. The jaw bone tractor is a jaw bone tractor which can realize self-locking because a screw rod is not easy to rotate in the process of dragging osteogenesis.
Description
Technical Field
The invention belongs to the technical field of medical instruments for oral, jaw surgery and plastic surgery, and particularly relates to a jaw tractor capable of preventing rotation.
Background
At present, there is a special retractor for jaw bone, which is widely used in oral, maxillofacial or cranial surgery and plastic surgery, and the technical principle of the retractor can be summarized as follows: the soft tissue around the jawbone is firstly cut, after the mandible is completely or incompletely cut, the broken end of the bone is gradually propped open by external force to form a gap, the bone forming capability of the jawbone is induced by traction force, and new bone is continuously formed to fill the gap, so that the aim of prolonging the mandible is fulfilled. The technology utilizes the regeneration potential of organism tissues and can repair bone defects or defect deformities caused by various congenital or acquired reasons.
For example, chinese utility model patent No. ZL95200175.6 (publication No. CN2205709Y) 'a jaw traction extender', chinese utility model patent No. ZL98225259.5 (publication No. CN2341572Y) 'jaw traction extender', and chinese utility model patent No. ZL99234512.x (publication No. CN2378010Y) 'oral cavity lower jaw traction extender' all disclose jaw tractors having the same working principle. All adopt the screw rod as towed drive disk assembly, rotate the adjustment handle during operation and drive the screw rod rotatory, and then drive the removal of activity traction plate.
Present jaw tractor has following defect, expose because of adjustment handle, and pull after the end, the jaw self that struts has certain restoring force, if drive handle is touched to the external world carelessly, perhaps the vibration influence, lead to the screw rod to produce and deflect towards the orientation of relaxing, it all adopts two tractors to pull together to pull jaw generally, if the traction position of one of them tractor changes, can lead to jaw to pull inhomogeneously, the skew takes place in the clearance between disconnected bone, finally make the new bone formation sawtooth that produces, seriously influence operation quality.
Therefore, how to ensure that the screw rod is not easy to rotate and realize self-locking in the using process of the retractor is one of the technical problems to be solved by the technical personnel in the field.
Disclosure of Invention
The invention aims to solve the technical problem of providing a jaw bone tractor which is not easy to rotate and further realizes self-locking in the process of dragging osteogenesis, aiming at the current technical situation, and has the advantages of simple structure, convenient fixing and adjustment and accurate adjustment.
The technical scheme adopted by the invention for solving the technical problems is as follows: a jaw bone tractor preventing rotation comprises a traction frame, a jaw bone tractor and a jaw bone tractor, wherein the traction frame is provided with a guide groove arranged along the length direction; the fixed traction plate is fixedly arranged relative to the traction frame, and a plurality of first mounting holes for the self-tapping screws to penetrate through are formed in the fixed traction plate; the movable traction seat is restrained in the guide groove and can axially slide, and a threaded through hole which axially penetrates through the movable traction seat is formed in the movable traction seat; the movable traction plate is fixed on the movable traction seat, and a plurality of second mounting holes for the self-tapping screws to penetrate through are formed in the movable traction plate; the screw rod is arranged in the guide groove and can rotate around the axis of the screw rod, the front end of the screw rod penetrates out of the traction frame to form a driving end in transmission connection with the adjusting handle, and the screw rod penetrates through and is in threaded connection with a threaded through hole in the movable traction seat; the method is characterized in that: the fixing sleeve is sleeved outside the driving end, an unlocking locking structure is arranged between the fixing sleeve and the traction frame, the fixing sleeve can be relatively fixed with the traction frame in a locking state, and the fixing sleeve can rotate around the axis of the fixing sleeve relative to the traction frame in a locking releasing state; and the anti-rotation structure is arranged between the fixed sleeve and the driving end, and can prevent the screw from rotating reversely under the state that the fixed sleeve is fixed relative to the traction frame by the locking structure.
The back end of the guiding groove is fixed with a first plug, and an accommodating cavity with an opening facing the guiding groove is arranged in the first plug; a second plug is fixed at the front end of the guide groove; the rear end of the screw rod is movably inserted into the accommodating cavity, the front part of the screw rod is provided with an annular blocking shoulder matched with the second plug in a blocking way, and the front end of the screw rod penetrates out of the second plug to form the driving end; the front end of the second plug is provided with a connecting section extending forwards, the fixing sleeve is sleeved on the connecting section, and the locking structure is arranged between the fixing sleeve and the connecting section. This structure does benefit to the processing of traction frame, and the convenience is assembled each accessory on the traction frame simultaneously.
Preferably, the locking structure comprises a pre-tightening screw, the fixed sleeve is provided with a threaded through hole, the pre-tightening screw is in threaded connection with the threaded through hole, the pre-tightening screw tightly abuts against the outer peripheral surface of the connecting section to achieve locking after the pre-tightening screw is tightened, and the pre-tightening screw is loosened to release the locking. The locking structure has few related parts and simple locking mode, and only needs to screw or unscrew the pre-tightening screw.
The anti-rotation structure comprises a movable stop pin, wherein the movable stop pin is movably arranged in the driving end in a penetrating mode and can slide in the radial direction, a plurality of variable arc sections which are arranged at intervals along the circumference and gradually reduce the radius along the clockwise direction are arranged on the inner hole wall of the fixed sleeve, and a blocking wall for blocking and matching the movable stop pin is formed by a fall part between every two adjacent variable arc sections; when the fixed sleeve is fixed relative to the traction frame by the locking structure, the movable stop pin can be pushed by the arc-variable section to slide radially in the process that the movable stop pin rotates clockwise along with the driving end, and the stop wall stops the movable stop pin from further rotating counterclockwise along with the driving end. The anti-rotation function is realized, only two main accessories, namely the movable stop pin and the fixed sleeve, are added, the related parts are few, the processing of the variable arc section on the fixed sleeve is also convenient, the movable stop pin can be effectively blocked by the blocking wall, the radial sliding of the movable stop pin ensures that the clockwise rotation of the driving end is not blocked,
in order to facilitate the sliding of the movable stop pin on the arc-variable section, two ends of the movable stop pin are cambered surfaces.
Preferably, the guide groove is composed of a circular groove portion located at the lower part and a strip-shaped groove portion located at the upper part, the strip-shaped groove portion is communicated with the circular groove portion, and the maximum radial width of the circular groove portion is larger than the width of the strip-shaped groove portion; the lower part of the movable traction seat is provided with a cylindrical part with the appearance matched with the circular groove part, the threaded through hole is arranged on the cylindrical part, the middle part of the movable traction seat is provided with a guide part with the appearance matched with the strip-shaped groove part, and the lower end surface of the movable traction seat is placed on the upper end surface of the traction frame. Because of the radial maximum width of the circular groove part is larger than the width of the strip-shaped groove part, the cylindrical part at the lower part of the movable traction seat is restrained in the circular groove part and can only slide back and forth, so that the traction distance can be adjusted more accurately.
In order to conveniently and accurately fix the movable traction plate on the movable traction seat, the middle part of the upper end surface of the movable traction seat is provided with an upward convex fixed column, and the movable traction plate is provided with a fixed hole for inserting and matching the fixed column; the front and rear sides of the upper end face of the movable traction seat are provided with upwards protruding insertion blocks, and the front and rear sides of the movable traction plate are provided with slots for the insertion blocks to be inserted and matched. The movable traction seat and the movable traction plate are accurately connected through the fixed column, the fixed hole and the positioning matching of the insertion block and the slot, and then the movable traction seat and the movable traction plate are fixed through welding.
The lower end face of the fixed traction plate is provided with a downward convex dowel bar, the shape of the dowel bar is matched with that of the strip-shaped groove portion, and the dowel bar is inserted into the strip-shaped groove portion and then welded and fixed with the first plug. Through the positioning fit of the dowel bars and the strip-shaped groove parts, the fixed traction plate and the traction frame are fixed more accurately.
In order to facilitate the connection of the screw rod and the adjusting handle, the cross section of the driving end is polygonal, and the adjusting handle is a wrench with a steering coupler. Therefore, the adjusting handle can rotate, and the adjusting handle is convenient to operate.
Optionally, the left side and the right side of the fixed traction plate are respectively provided with an L-shaped first fixed arm part, each first fixed arm part is provided with three first mounting holes, the middle part of the fixed traction plate is provided with a middle arm part extending outwards, and the middle arm part is provided with two first mounting holes; the left side and the right side of the movable traction plate are provided with L-shaped first movable arm parts, and three second mounting holes are formed in each first movable arm part.
Compared with the prior art, the invention has the advantages that: when in use, only a small incision is needed to be cut at the corresponding soft tissue of the jaw bone, the fixed traction plate is fixed on the jaw bone at one side of the incision, the movable traction plate is fixed on the jaw bone at the other side of the incision, when in adjustment, the screw rod is rotated, according to the working principle of threaded connection adjustment of the screw rod and the threaded hole, the movable traction plate and the movable traction seat are forced to slide upwards or downwards relative to the screw rod together to generate a gap, the self osteogenesis capacity of the jaw bone is induced by utilizing traction force to continuously form new bones to fill the gap, the traction distance can be accurately and slowly adjusted through threaded transmission of the screw rod and the threaded hole, the whole tractor can be disassembled only by disassembling the fixed traction plate and the movable traction plate after the adjustment is completed, then the jaw wound is processed, the adjusting process is simple and convenient, the structure of the tractor has few related parts, and the mutual positions and the assembly relationship are simple. More importantly, in the beginning, the fixed sleeve is in a state of releasing locking, the retention sleeve rotates together with the rotation of the screw, when the traction plate is positioned by an operator, the fixed sleeve is locked, at the moment, the retention sleeve and the traction frame can be locked without rotating, when the retention sleeve and the traction frame rotate according to the traction direction of the osteogenesis, the anti-rotation structure can not play a role of stopping the rotation, when the anti-rotation structure rotates in the opposite direction, the anti-rotation structure can prevent the screw from rotating in the opposite direction, the self-locking function of the screw is realized, in the osteogenesis process, even if external force accidentally touches the driving handle or has certain vibration, and the self-generated restoring force of the jaw after traction can not cause the screw to deflect in the loosening direction, the fixed traction plate and the movable traction plate to be always kept at proper positions, the generated new bone is ensured to be.
Drawings
FIG. 1 is a cross-sectional view of an embodiment of the present invention;
FIG. 2 is a top view of an embodiment of the present invention;
FIG. 3 is a view taken along line A-A of FIG. 2 (initial position state of the screw);
FIG. 4 is a view from direction A-A of FIG. 2 (screw clockwise rotation state);
FIG. 5 is a view from direction A-A of FIG. 2 (the screw is rotated counterclockwise);
fig. 6 is an exploded perspective view of an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in FIGS. 1 to 6, a first embodiment of the present invention is described.
A jaw bone tractor for preventing rotation comprises
The traction frame 1 is provided with a guide groove 11 arranged along the length direction; a first plug 2 is fixed at the rear end of the guide groove 11, and an accommodating cavity 21 with an opening facing the guide groove 11 is arranged in the first plug 2; the front end of the guide groove 11 is fixed with a second plug 4. The guide groove 11 is composed of a circular groove 111 at the lower part and a strip groove 112 at the upper part, the strip groove 112 is communicated with the circular groove 111, and the maximum radial width of the circular groove 111 is larger than the width of the strip groove 112.
The fixed traction plate 3 is fixedly arranged relative to the traction frame 1, and a plurality of first mounting holes 31 for self-tapping screws to penetrate are formed in the fixed traction plate 3; the lower end surface of the fixed traction plate 3 is provided with a downward convex inserting rib 32 with the shape matched with the strip-shaped groove part 112, and the inserting rib 32 is inserted into the strip-shaped groove part 112 and then is welded and fixed with the first plug 2. The left side and the right side of the fixed traction plate 3 are respectively provided with an L-shaped first fixed arm part 33, each first fixed arm part 33 is provided with three first mounting holes 31, the middle part of the fixed traction plate 3 is provided with a middle arm part 34 extending outwards, and the middle arm part 34 is provided with two first mounting holes 31.
The movable traction seat 5 is restrained in the guide groove 11 and can axially slide, and a threaded through hole 511 which axially penetrates through the movable traction seat 5 is formed; the lower part of the movable traction seat 5 is provided with a cylindrical part 51 with the shape matched with the circular groove part 111, the threaded through hole 511 is arranged on the cylindrical part 51, the middle part of the movable traction seat 5 is provided with a guide part 52 with the shape matched with the strip-shaped groove part 112, and the lower end surface of the movable traction seat 5 is placed on the upper end surface of the traction frame 1.
The movable traction plate 6 is fixed on the movable traction seat 5, and a plurality of second mounting holes 61 for the self-tapping screws to penetrate are formed in the movable traction plate 6; the middle part of the upper end surface of the movable traction seat 5 is provided with a fixing column 53 protruding upwards, and the movable traction plate 6 is provided with a fixing hole 62 for inserting and matching the fixing column 53; the front and rear sides of the upper end surface of the movable traction seat 5 are provided with upwards protruding insertion blocks 54, and the front and rear sides of the movable traction plate 6 are provided with slots 63 for the insertion of the insertion blocks 54. The left and right sides of the movable traction plate 6 are provided with L-shaped first movable arm parts 64, and each first movable arm part 64 is provided with three second mounting holes 61.
The screw 7 is arranged in the guide groove 11 and can rotate around the axis of the screw 7, the rear end of the screw 7 is movably inserted into the accommodating cavity 21, the front end of the screw 7 penetrates out of the second plug 4 to form a driving end 73 in transmission connection with the adjusting handle 9, the cross section of the driving end 73 is polygonal, and the adjusting handle 9 is a wrench with a steering coupler 91. The front part of the screw 7 is provided with an annular blocking shoulder 71 which is blocked and matched with the second plug 4, and the screw 7 passes through and is in threaded connection with a threaded through hole 511 on the movable traction seat 5. The traction distance is 0.4mm when the screw rotates once.
The front end of the fixed sleeve 8 and the front end of the second plug 4 are provided with a connecting section 41 extending forwards, the fixed sleeve 8 is sleeved on the connecting section 41, a locking structure capable of being unlocked is arranged between the fixed sleeve 8 and the connecting section 41, the fixed sleeve 8 can be relatively fixed with the traction frame 1 in a locking state, and the fixed sleeve 8 can rotate around the axis of the traction frame 1 relative to the traction frame 1 in a unlocking state. Specifically, the locking structure comprises a pre-tightening screw 10, a threaded through hole 81 is formed in the fixed sleeve 8, the pre-tightening screw 10 is in threaded connection with the threaded through hole 81, the pre-tightening screw 10 is tightly abutted to the outer peripheral surface of the connecting section 41 to achieve locking after the pre-tightening screw 10 is screwed down, and locking is released when the pre-tightening screw 10 is unscrewed.
And the anti-rotation structure is arranged between the fixed sleeve 8 and the driving end 73, and can prevent the screw 7 from rotating reversely under the state that the fixed sleeve 8 is fixed relative to the traction frame 1 by the locking structure.
Specifically, the anti-rotation structure includes a movable stop pin 72, and both ends of the movable stop pin 72 are cambered surfaces 721. The movable sleeve is movably arranged in the driving end 73 in a penetrating way and can slide in the radial direction, three variable arc sections 82 with the radius gradually reduced along the clockwise direction are arranged on the inner hole wall of the fixed sleeve 8 at intervals along the circumference, the variable arc sections are similar to an involute, a fall part between every two adjacent variable arc sections 82 forms a blocking wall 83 for blocking and matching the movable stop pin 72, and the number of the blocking walls 83 is three; in the state that the fixed sleeve 8 is fixed relative to the traction frame 1 by the locking structure, in the process that the movable stop pin 72 rotates clockwise along with the driving end 73, the movable stop pin 72 can be pushed by the variable arc section 82 to slide radially, and when the movable stop pin 72 rotates counterclockwise along with the driving end 73, the stop wall 83 stops the movable stop pin 72 from further rotating counterclockwise.
In the embodiment, the movable traction plate 3 and the fixed traction plate 6 are made of pure titanium TA3 material, and other parts are made of titanium alloy TC4 material. The hardness of the titanium alloy is equal to or more than 260HV10, and the hardness of the pure titanium is equal to or more than 150HV 10.
During the use, select the model of suitable jaw tractor and confirm tractor mounted position, pretension screw 10 is loose all the time, the retention sleeve 8 can rotate along with the rotation of screw rod 7 together, only need cut the small way mouth at corresponding jaw soft tissue, fix fixed traction plate 3 on the jaw of incision one side, fix activity traction plate 6 on the jaw of incision opposite side again, after the traction plate was fixed a position to the doctor, again tighten pretension screw 10, fixed cover 8 is fixed with second end cap 4, thereby make fixed cover 8 can with traction frame 1 relatively fixed, fixed cover 8 can not rotate along with the rotation of screw rod 7 together. During adjustment, the inner hexagon of the adjusting handle 9 is inserted into the small outer hexagon driving end 73 on the screw rod 7, the adjusting handle 9 is rotated clockwise (in the direction indicated by the arrow on the handle) to drive the screw rod 7 to rotate, the movable traction plate 6 and the movable traction seat 5 are forced to slide forwards or backwards relative to the screw rod 4 according to the threaded connection adjustment working principle of the screw rod 7 and the threaded hole 511, a gap is generated when the screw rod 4 rotates for one circle, the traction distance is 0.4mm, the traction force is utilized to induce the osteogenesis capability of the jaw bone to continuously form a new bone to fill the gap, the thread transmission energy of the screw rod 4 and the threaded hole 511 can accurately and slowly adjust the traction distance, and the traction is stopped after the clinical expected effect is achieved. Finally, the whole tractor can be disassembled only by detaching the fixed traction plate 3 and the movable traction plate 6, and then the jaw wound is treated, and meanwhile, the adjusting process is simple and convenient.
As shown in fig. 4, when rotating in the distraction direction of the osteogenesis (clockwise rotation as shown), the movable stop pin 72 can be pushed by the arc segment 82 to slide radially, the movable stop pin 72 rotates counterclockwise with the driving end 73, the movable stop pins 72 all cross the top of the blocking wall 83, and the blocking wall 83 cannot play a role of stopping;
when the bone forming device rotates in the opposite direction (counterclockwise rotation shown in the figure), as shown in fig. 5, the blocking wall 83 prevents the movable stop pin 72 from further counterclockwise rotation, and further prevents the screw 7 from reversely rotating, so as to realize the self-locking function of the screw 7.
It should be noted that in the description of the present embodiment, the terms "front, back", "left, right", "up, down", "clockwise and counterclockwise" and the like indicate the orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Although preferred embodiments of the present invention have been described in detail hereinabove, it should be clearly understood that modifications and variations of the present invention are possible to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A jaw bone tractor for preventing rotation comprises
The traction frame (1) is provided with a guide groove (11) arranged along the length direction;
the fixed traction plate (3) is fixedly arranged relative to the traction frame (1), and a plurality of first mounting holes (31) for self-tapping screws to penetrate are formed in the fixed traction plate (3);
the movable traction seat (5) is constrained in the guide groove (11) and can axially slide, and a threaded through hole (511) which axially penetrates through the movable traction seat (5) is formed in the movable traction seat;
the movable traction plate (6) is fixed on the movable traction seat (5), and a plurality of second mounting holes (61) for the tapping screws to penetrate are formed in the movable traction plate (6);
the screw rod (7) is arranged in the guide groove (11) and can rotate around the axis of the screw rod, the front end of the screw rod (7) penetrates out of the traction frame (1) to form a driving end (73) in transmission connection with the adjusting handle (9), and the screw rod (7) penetrates through and is in threaded connection with a threaded through hole (511) in the movable traction seat (5);
the method is characterized in that: also comprises
The fixing sleeve (8) is sleeved outside the driving end (73), an unlocking locking structure is arranged between the fixing sleeve (8) and the traction frame (1), the fixing sleeve (8) can be relatively fixed with the traction frame (1) in a locking state, and the fixing sleeve (8) can rotate around the axis of the fixing sleeve (8) relative to the traction frame (1) in a locking releasing state;
and the anti-rotation structure is arranged between the fixed sleeve (8) and the driving end (73), and can prevent the screw rod (7) from rotating reversely under the state that the fixed sleeve (8) is fixed relative to the traction frame (1) by the locking structure.
2. The anti-rotation jaw retractor of claim 1 wherein: a first plug (2) is fixed at the rear end of the guide groove (11), and an accommodating cavity (21) with an opening facing the guide groove (11) is formed in the first plug (2); a second plug (4) is fixed at the front end of the guide groove (11); the rear end of the screw rod (7) is movably inserted into the accommodating cavity (21), the front part of the screw rod (7) is provided with an annular blocking shoulder (71) which is blocked and matched with the second plug (4), and the front end of the screw rod (7) penetrates through the second plug (4) to form the driving end (73); the front end of the second plug (4) is provided with a connecting section (41) extending forwards, the fixing sleeve (8) is sleeved on the connecting section (41), and the locking structure is arranged between the fixing sleeve (8) and the connecting section (41).
3. The anti-rotation jaw retractor of claim 1 wherein: the locking structure comprises a pre-tightening screw (10), a thread through hole (81) is formed in the fixing sleeve (8), the pre-tightening screw (10) is in threaded connection with the thread through hole (81), the pre-tightening screw (10) is screwed down, the pre-tightening screw (10) is tightly abutted to the outer peripheral face of the connecting section (41) to achieve locking, and the pre-tightening screw (10) is unscrewed to release locking.
4. A jaw retractor for preventing rotation according to any one of claims 1 to 3 wherein: the anti-rotation structure comprises a movable stop pin (72), the movable stop pin is movably arranged in the driving end (73) in a penetrating mode and can slide in the radial direction, a plurality of variable arc sections (82) which are arranged at intervals along the circumference and gradually reduce the radius in the clockwise direction are arranged on the inner hole wall of the fixed sleeve (8), and a fall part between every two adjacent variable arc sections (82) forms a blocking wall (83) for blocking and matching the movable stop pin (72); under the condition that the fixed sleeve (8) is fixed relative to the traction frame (1) by the locking structure, in the process that the movable stop pin (72) rotates clockwise along with the driving end (73), the movable stop pin (72) can be pushed by the variable arc section (82) to slide radially, the movable stop pin (72) rotates anticlockwise along with the driving end (73), and the stop wall (83) stops the movable stop pin (72) from further rotating anticlockwise.
5. The anti-rotation jaw retractor of claim 4 wherein: the two ends of the movable stop pin (72) are cambered surfaces (721).
6. The anti-rotation jaw retractor of claim 1 wherein: the guide groove (11) consists of a circular groove part (111) positioned at the lower part and a strip-shaped groove part (112) positioned at the upper part, the strip-shaped groove part (112) is communicated with the circular groove part (111), and the radial maximum width of the circular groove part (111) is greater than the width of the strip-shaped groove part (112); the lower part of the movable traction seat (5) is provided with a cylindrical part (51) of which the shape is matched with that of the circular groove part (111), the threaded through hole (511) is arranged on the cylindrical part (51), the middle part of the movable traction seat (5) is provided with a guide part (52) of which the shape is matched with that of the strip-shaped groove part (112), and the lower end surface of the movable traction seat (5) is placed on the upper end surface of the traction frame (1).
7. The anti-rotation jaw retractor of claim 6 wherein: the middle part of the upper end face of the movable traction seat (5) is provided with a fixing column (53) protruding upwards, and the movable traction plate (6) is provided with a fixing hole (62) for inserting and matching the fixing column (53); the front side and the rear side of the upper end surface of the movable traction seat (5) are provided with upwards protruding insertion blocks (54), and the front side and the rear side of the movable traction plate (6) are provided with insertion grooves (63) for the insertion of the insertion blocks (54).
8. The anti-rotation jaw retractor of claim 7 wherein: the lower end face of the fixed traction plate (3) is provided with a downward-convex dowel (32) matched with the strip-shaped groove part (112) in shape, and the dowel (32) is inserted into the strip-shaped groove part (112) and then welded and fixed with the first plug (2).
9. The anti-rotation jaw retractor of claim 1 wherein: the cross section of the driving end (73) is polygonal, and the adjusting handle (9) is a wrench with a steering coupler (91).
10. The anti-rotation jaw retractor of claim 1 wherein: the left side and the right side of the fixed traction plate (3) are respectively provided with an L-shaped first fixed arm part (33), each first fixed arm part (33) is provided with three first mounting holes (31), the middle part of the fixed traction plate (3) is provided with a middle arm part (34) extending outwards, and the middle arm part (34) is provided with two first mounting holes (31); the left side and the right side of the movable traction plate (6) are provided with L-shaped first movable arm parts (64), and three second mounting holes (61) are formed in each first movable arm part (64).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911132335.8A CN110693588A (en) | 2019-11-19 | 2019-11-19 | Jaw tractor capable of preventing rotation |
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| CN201911132335.8A CN110693588A (en) | 2019-11-19 | 2019-11-19 | Jaw tractor capable of preventing rotation |
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| CN110693588A true CN110693588A (en) | 2020-01-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112971958A (en) * | 2020-12-29 | 2021-06-18 | 宁波慈北医疗器械有限公司 | External mandible tractor |
| WO2023161747A1 (en) * | 2022-02-23 | 2023-08-31 | DePuy Synthes Products, Inc. | Three dimensional distractors |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104665901A (en) * | 2015-03-02 | 2015-06-03 | 宁波慈北医疗器械有限公司 | Alveolar bone tractor |
| EP3064167A1 (en) * | 2015-03-05 | 2016-09-07 | Medicon Eg Chirurgiemechaniker-Genossenschaft | Distraction set, comprising a device for distraction or elongation of bone segments |
| CN109567883A (en) * | 2018-05-25 | 2019-04-05 | 宁波慈北医疗器械有限公司 | A kind of jaw bone tractor of self-locking function |
| CN211271079U (en) * | 2019-11-19 | 2020-08-18 | 宁波慈北医疗器械有限公司 | Jaw tractor capable of preventing rotation |
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2019
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104665901A (en) * | 2015-03-02 | 2015-06-03 | 宁波慈北医疗器械有限公司 | Alveolar bone tractor |
| EP3064167A1 (en) * | 2015-03-05 | 2016-09-07 | Medicon Eg Chirurgiemechaniker-Genossenschaft | Distraction set, comprising a device for distraction or elongation of bone segments |
| CN109567883A (en) * | 2018-05-25 | 2019-04-05 | 宁波慈北医疗器械有限公司 | A kind of jaw bone tractor of self-locking function |
| CN211271079U (en) * | 2019-11-19 | 2020-08-18 | 宁波慈北医疗器械有限公司 | Jaw tractor capable of preventing rotation |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112971958A (en) * | 2020-12-29 | 2021-06-18 | 宁波慈北医疗器械有限公司 | External mandible tractor |
| WO2023161747A1 (en) * | 2022-02-23 | 2023-08-31 | DePuy Synthes Products, Inc. | Three dimensional distractors |
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