CN115568921B - A spinal distraction device - Google Patents
A spinal distraction device Download PDFInfo
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- CN115568921B CN115568921B CN202211062555.XA CN202211062555A CN115568921B CN 115568921 B CN115568921 B CN 115568921B CN 202211062555 A CN202211062555 A CN 202211062555A CN 115568921 B CN115568921 B CN 115568921B
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- 230000007246 mechanism Effects 0.000 claims abstract description 23
- 230000002093 peripheral effect Effects 0.000 claims description 16
- 230000009467 reduction Effects 0.000 abstract description 4
- 206010041569 spinal fracture Diseases 0.000 abstract description 4
- 230000006835 compression Effects 0.000 description 11
- 238000007906 compression Methods 0.000 description 11
- 238000009434 installation Methods 0.000 description 10
- 230000006872 improvement Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000001356 surgical procedure Methods 0.000 description 4
- 208000010392 Bone Fractures Diseases 0.000 description 3
- 206010017076 Fracture Diseases 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 238000002324 minimally invasive surgery Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002980 postoperative effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000001954 sterilising effect Effects 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
- 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 or setting implements
- A61B17/60—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements for external osteosynthesis, e.g. distractors, contractors
- A61B17/66—Alignment, compression or distraction mechanisms
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/02—Surgical instruments, devices or methods for holding wounds open, e.g. retractors; Tractors
- A61B17/0206—Surgical instruments, devices or methods for holding wounds open, e.g. retractors; Tractors with antagonistic arms as supports for retractor elements
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/02—Surgical instruments, devices or methods for holding wounds open, e.g. retractors; Tractors
- A61B17/025—Joint distractors
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- 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 or setting implements
- A61B17/60—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements for external osteosynthesis, e.g. distractors, contractors
- A61B17/64—Devices extending alongside the bones to be positioned
- A61B17/6433—Devices extending alongside the bones to be positioned specially adapted for use on body parts other than limbs, e.g. trunk or head
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- 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 or setting implements
- A61B17/60—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements for external osteosynthesis, e.g. distractors, contractors
- A61B17/64—Devices extending alongside the bones to be positioned
- A61B17/6466—Devices extending alongside the bones to be positioned with pin-clamps movable along a solid connecting rod
- A61B17/6475—Devices extending alongside the bones to be positioned with pin-clamps movable along a solid connecting rod the connecting rod being threaded
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/02—Surgical instruments, devices or methods for holding wounds open, e.g. retractors; Tractors
- A61B17/025—Joint distractors
- A61B2017/0256—Joint distractors for the spine
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- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Molecular Biology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Engineering & Computer Science (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
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- Veterinary Medicine (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Surgical Instruments (AREA)
- Prostheses (AREA)
Abstract
The invention discloses a spine stretching device, which comprises: a guide rod; the fixed connector is connected with the guide rod; the movable connector is provided with a movable hole, the guide rod penetrates through the movable hole, the movable connector can rotate around the guide rod and can move along the extending direction of the guide rod, and the movable connector and the fixed connector are respectively provided with a fixing mechanism for fixing pedicle screws; the locking mechanism is respectively and movably connected with the movable connector and the guide rod so as to lock the relative positions of the movable connector and the guide rod. The spine stretching device provided by the invention can fix the pedicle screws, realize stretching or compressing the vertebral bodies, has a simple structure, is convenient to operate and strong in adaptability, and is suitable for being widely applied to reduction operation of fracture vertebral bodies.
Description
Technical Field
The invention relates to the technical field of medical appliances, in particular to a spinal column expanding device.
Background
At present, two main modes of correcting vertebral fracture of the spine in the spine surgery are provided, one mode is that the spine is propped up, reset, corrected and fixed by adopting a pedicle screw rod system through open or minimally invasive surgery, the surgery is large in wound, high in cost and long in postoperative recovery period, the spine is not suitable for old and weak patients, the other mode is that the spine is fixed by minimally invasive surgery and an external fixator, the surgery is small in wound and low in cost, normal life can be recovered after the external fixator is removed after the surgery, and the spine fracture treatment device is a good mode for treating the senile compression vertebral fracture at present, but the spine fracture is recovered mainly through a prying and resetting mode, and the functions of longitudinal propping up and compression are limited.
In order to further solve the problem of the longitudinal expansion and compression function deficiency of the external fixator, the technical research and development team independently develops a temporary expansion fixing device (application number 202011124251.2) for the vertebroplasty operation, but the device is found in the actual use process, the structure is complex, the actual condition of a patient is complex and various, two pedicle screws can be positioned on different planes due to the limitation of the vertebroplasty, and when the two pedicle screws are not positioned on the same plane, the device is difficult to fix the pedicle screws and is unfavorable for the actual clinical use.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the invention proposes a spinal distraction device.
The invention solves the technical problems as follows:
A spinal distraction device comprising:
A guide rod;
The fixed connector is connected with the guide rod;
The movable connector is provided with a movable hole, the guide rod penetrates through the movable hole, the movable connector can rotate around the guide rod and can move along the extending direction of the guide rod, and the movable connector and the fixed connector are respectively provided with a fixing mechanism for fixing pedicle screws;
And the locking mechanism is respectively and movably connected with the movable connector and the guide rod so as to lock the distance between the movable connector and the fixed connector.
The invention has at least the following beneficial effects: the movable connector and the fixed connector can respectively fix pedicle screws, and the movable connector can move along the extending direction of the guide rod, namely, the distance between the movable connector and the fixed connector can be changed, so that the pedicle screws arranged on the movable connector and the pedicle screws arranged on the fixed connector are mutually close to or far away from each other, and the compression or the expansion of the vertebral bodies is realized; the locking mechanism can lock the position of the movable connector, so that the distance between the movable connector and the fixed connector is ensured, the compression or expansion state of the vertebral body is maintained, and the movable connector is prevented from moving to influence the compression or expansion of the vertebral body in the operation process; in addition, because the movable connector can rotate around the guide rod, when the two pedicle screws are positioned on different planes due to the limitation of the vertebral body, the two pedicle screws can be fixed, the adaptability is strong, and the practical clinical use is facilitated.
As a further improvement of the technical scheme, the fixed connector and the movable connector are respectively provided with a mounting hole and a fixing screw hole, the mounting holes are used for the pedicle screws to penetrate, the mounting holes are communicated with the fixing screw holes, the fixed connector and the movable connector are further provided with fixing bolts, the fixing bolts penetrate through the fixing screw holes and are matched and connected with the fixing screw holes, the end faces of the fixing bolts can extend into the mounting holes, and the mounting holes, the fixing screw holes and the fixing bolts form the fixing mechanism. The pedicle screws are correspondingly inserted into the mounting holes of the fixed connector or the movable connector, the fixing bolts are screwed into the fixing screw holes, the pedicle screws are clamped together by the fixing bolts and the hole walls of the mounting holes, the pedicle screws are fixed, and therefore the two pedicle screws can be stably mounted on the spine supporting device, and the operation is simple and convenient.
As a further improvement of the technical scheme, the fixing mechanism further comprises a positioning structure, the positioning structure is movably connected with the end face of the fixing bolt, the positioning structure can extend into the mounting hole, and the positioning mechanism is provided with a contact surface for being abutted with the peripheral wall surface of the pedicle screw. The locating structure can be changed according to the angle of the pedicle screw, the contact area of the fixing bolt to the peripheral wall surface of the pedicle screw is increased through the locating structure, and especially when the fixing bolt is used for fixing an included angle between the end surface of the pedicle screw and the pedicle screw, the locating structure can make up the included angle, and the fastening capability of the fixing bolt to the pedicle screw is further improved.
As a further improvement of the technical scheme, the end face of the fixing bolt is provided with a groove, the positioning structure comprises a ball and an abutting block, the groove wall of the groove is matched with the outer surface of the ball, the ball is embedded in the groove and movably connected with the groove wall of the groove, the abutting block is connected with the ball and protrudes out of the end face of the fixing bolt, and the abutting block is provided with the contact surface.
Because the ball can rotate in the recess, can change the direction of butt piece promptly, when pedicle screw slope installation in the mounting hole, butt piece also can change the direction according to pedicle screw's inclination to keep the periphery wall surface contact with pedicle screw, thereby guarantee the fastening effect to pedicle screw.
As a further improvement of the technical scheme, the locking mechanism is a nut, the guide rod is provided with an external thread structure, the nut is sleeved on the guide rod and is connected with the external thread structure in a matched mode, and the nut is connected with the movable connector in a rotating mode.
When the nut is screwed, the nut can move along the extending direction of the guide rod, namely the whole movable connector can be driven to move along the extending direction of the guide rod, so that the distance between the movable connector and the fixed connector can be changed, the distance between two pedicle screws is further changed, and the vertebral body is expanded or compressed according to actual requirements; in addition, the external thread structure on the guide rod also plays a role in graduation, and the rotation number of the nut can be used for recording the distance of the centrum expansion.
As a further improvement of the technical scheme, the movable connector is provided with a mounting groove, the peripheral wall surface of the nut is provided with a mounting circular ring, and the mounting circular ring is rotationally connected with the groove wall of the mounting groove. Due to the mutual limitation of the mounting groove and the mounting ring, when the nut moves along the extending direction of the guide rod, the movable connector can be driven to move along the extending direction of the guide rod.
As a further improvement of the above technical solution, the mounting ring is detachably connected with the mounting groove. The installation ring of nut can be followed the mounting groove and torn open, can make nut and movable connector separation promptly, more is favorable to the change and the cleanness of spare part.
As a further improvement of the above technical solution, the fixed connector is detachably connected with the guide rod. The fixing connector can be detached from the guide rod, so that the spine opening device is favorable for packaging, transportation and storage.
As a further improvement of the technical scheme, the fixed connector is provided with a first connecting hole, the guide rod is provided with a second connecting hole, the axis of the second connecting hole forms an included angle with the axis of the guide rod, the spine expanding device further comprises a fixing pin, and the fixing pin penetrates through the first connecting hole and the second connecting hole. Through the fixed action of the fixed pin, the fixed connector and the guide rod cannot rotate or move relatively, and the structure is simple and the operation is convenient.
As a further improvement of the above technical solution, the guide rod is provided with a positioning block, and the positioning block is abutted with the fixed connector. The locating piece can play the effect of location to the installation of fixed connector to make first connecting hole and second connecting hole align each other more easily, accelerate the installation between fixed connector and the guide bar.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is evident that the drawings described are only some embodiments of the invention, but not all embodiments, and that other designs and drawings can be obtained from these drawings by a person skilled in the art without inventive effort.
FIG. 1 is a schematic view of the overall construction of a spinal distraction device in accordance with an embodiment of the present invention;
FIG. 2 is a schematic view of a guide bar according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a fixed connector according to an embodiment of the present invention;
FIG. 4 is a schematic view of the structure of the movable connector according to the embodiment of the present invention;
FIG. 5 is a schematic view of the structure of a nut according to an embodiment of the present invention;
FIG. 6 is a schematic view of a structure of a fixing bolt according to an embodiment of the present invention;
fig. 7 is a front view of a fixing bolt according to an embodiment of the present invention;
FIG. 8 is a cross-sectional view taken along the direction A-A in FIG. 7;
fig. 9 is a schematic view of the use of a spinal distraction device in accordance with an embodiment of the present invention.
Reference numerals: 100. a guide rod; 110. a positioning block; 120. a second connection hole; 200. fixing the connector; 210. a fixing pin; 220. a first connection hole; 300. a movable connector; 310. a mounting groove; 400. a nut; 410. installing a circular ring; 500. a fixing bolt; 510. an abutment block; 520. a ball; 530. a mounting hole; 600. pedicle screws; 700. a vertebral body.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.
In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
It is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present invention based on the embodiments of the present invention. The technical features of the invention can be interactively combined on the premise of no contradiction and conflict.
Referring to fig. 1 to 9, an embodiment of the present invention provides a spinal column distracting device, which includes a guide rod 100, a fixed connector 200 and a movable connector 300, and can be used in cooperation with two pedicle screws 600, wherein the pedicle screws 600 contact with a vertebral body 700, so that the functions of compressing and distracting the vertebral body 700 can be achieved, and the spinal column distracting device can fix the positions of the pedicle screws 600 to maintain the compressed or distracted state of the vertebral body 700.
It should be noted that the spinal distractor device of the present invention is also capable of securing two pedicle screws 600 when the two pedicle screws 600 are located in different planes.
Specifically, the guide rod 100 is provided with a fixed section and a movable section, the fixed section and the central axis of the movable end are on the same straight line, and the fixed section and the movable section are arranged along the same straight line in an extending manner.
The fixed connector 200 is connected with the fixed section of the guide bar 100. In the present embodiment, the fixed connector 200 is detachably connected to the guide bar 100. The fixed connector 200 is provided with a fixing hole, the fixing hole is sleeved on the fixing section, the fixed connector 200 is further provided with a fixing piece, and the fixing piece is used for fixing the fixed connector 200 on the fixing section of the guide rod 100, so that the fixed connector 200 and the guide rod 100 cannot move relatively after being mounted.
In this embodiment, the fixing connector 200 is further provided with a first connecting hole 220, and the fixing section is provided with a second connecting hole 120, the first connecting hole 220 can be communicated with the second connecting hole 120, the fixing member is a fixing pin 210, and the fixing pin 210 can be inserted into the first connecting hole 220 and the second connecting hole 120, so that the fixing connector 200 and the guide rod 100 cannot rotate or move relatively.
In the present embodiment, the axis of the first connecting hole 220 is perpendicular to the central axis of the guide bar 100, and the fixing pin 210 is perpendicular to the guide bar 100. It will be appreciated that the axis of the second connecting hole 120 needs to have a certain angle with the axis of the guide rod 100, so as to ensure that the fixing pin 210 is installed, and the fixing connector 200 does not move along the axis direction of the guide rod 100.
In some embodiments, the guide rod 100 is provided with the positioning block 110, the positioning block 110 is located between the fixed section and the movable section, when the fixed connector 200 is sleeved on the guide rod 100, the end face of the fixed connector 200 can be abutted with the positioning block 110, so that the fixed connector 200 can be positioned, the first connecting hole 220 and the second connecting hole 120 can be communicated more quickly, and the first connecting hole 220 and the second connecting hole 120 can be aligned without moving the fixed connector 200, so that the fixed connector 200 can be fixed more quickly.
In some embodiments, the positioning block 110 is provided with a positioning groove, and the end surface of the fixed connector 200 is correspondingly provided with a positioning boss, and the positioning boss is matched with the positioning groove, so that when the fixed connector 200 is sleeved on the guide rod 100, the positioning boss and the positioning groove can be fast clamped with each other, and therefore the fixed connector 200 can be fast limited, the fixed connector 200 is installed with a prompting function, the first connecting hole 220 and the second connecting hole 120 can be aligned without rotating the fixed connector 200, and the fixed connector 200 is fast fixed.
In other embodiments, the fixing connector 200 is connected to the fixing section by welding, gluing, or the like, that is, the fixing connector 200 cannot be detached from the guide rod 100, so that in practical use, the installation work between the fixing connector 200 and the guide rod 100 can be omitted, but the storage and the transportation are not facilitated.
The movable connector 300 is provided with a movable hole, the movable hole is sleeved on the movable section, the hole wall of the movable hole is movably connected with the movable section, and the movable connector 300 can move along the extending direction of the guide rod 100 and also can rotate around the central axis of the guide rod 100.
The spine opening device further comprises a locking mechanism which is movably connected with the movable section and is movably connected with the movable connector 300, so that the relative position of the movable connector 300 and the guide rod 100 can be locked, the movable connector 300 can be kept at a proper position on the guide rod 100, the distance between the movable connector 300 and the fixed connector 200 is kept, and the movable connector 300 is prevented from moving when the pedicle screw 600 is fixed to influence the operation of opening or compressing the vertebral body 700.
It will be appreciated that both the fixed connector 200 and the movable connector 300 are provided with a fixing mechanism for fixing the pedicle screw 600, and that the pedicle screw 600 can be mounted on the fixed connector 200 and the movable connector 300, wherein the pedicle screw 600 mounted on the movable connector 300 can rotate following the rotation of the movable connector 300 and can also move following the movable connector 300 in the extending direction of the guide rod 100.
It can be appreciated that compression or distraction of the vertebral body 700 is achieved because the movable connector 300 can move in the extension direction of the guide rod 100, i.e., the movable connector 300 can be moved toward or away from the fixed connector 200, thereby allowing the pedicle screw 600 mounted on the fixed connector 200 and the pedicle screw 600 mounted on the movable connector 300 to be moved toward or away from each other.
Because the movable connector 300 can rotate around the rotation of the guide rod 100, in the actual use process, the relative included angle of the two pedicle screws 600 can be changed according to the spine condition of the patient, namely, the two pedicle screws 600 can be positioned on different planes, and the spine opening device can be fixed, so that the spine opening device is suitable for more spine conditions.
In some embodiments, both the fixed connector 200 and the movable connector 300 are provided with mounting holes 530 and fixing screw holes, and are configured with fixing bolts 500, the mounting holes 530 and the fixing screw holes together constitute a fixing mechanism for fixing the pedicle screw 600 so that the mounting position and the mounting angle of the pedicle screw 600 remain unchanged, thereby maintaining the distraction or compression of the vertebral body 700.
It will be appreciated that the pedicle screw 600 can be inserted into the mounting hole 530, the lower end of the pedicle screw 600 contacts the vertebral body 700 and performs a distraction or compression function on the vertebral body 700, the mounting hole 530 is communicated with the fixing screw hole, and the fixing bolt 500 can be connected with the fixing screw hole in a matching manner.
When the fixing bolt 500 is penetrated through the fixing screw hole, an end surface of the fixing bolt 500 can be abutted against an outer circumferential wall surface of the pedicle screw 600 mounted in the mounting hole 530, where an end surface of the fixing bolt 500 for abutment against the pedicle screw 600 is set as a fixing surface and the other end surface is set as a rotating surface. The pedicle screw 600 is fixed by clamping the fixing surface and the wall of the mounting hole 530 to each other, so that the pedicle screw 600 can be stably mounted on the spinal column distraction device.
In this embodiment, the fixing screw hole is formed along the extending direction of the guide bar 100, and the fixing bolt 500 on the fixed connector 200 is opposite to the fixing bolt 500 on the movable connector 300, i.e. the fixing surface of the fixing bolt 500 on the fixed connector 200 faces the fixing surface of the fixing bolt 500 on the movable connector 300. So set up, because fixing bolt 500 pressurizes the upper portion of pedicle screw 600, can make the lower extreme of two pedicle screw 600 keep the state that keeps away from each other, keeps open the state promptly, can further realize the expansion reduction of fracture centrum 700.
In other embodiments, the fixing screw hole is also formed along the extending direction of the guide bar 100, and the fixing bolt 500 on the fixed connector 200 is disposed opposite to the fixing bolt 500 on the movable connector 300, that is, the fixing surface of the fixing bolt 500 on the fixed connector 200 faces away from the fixing surface of the fixing bolt 500 on the movable connector 300. So arranged, since the fixing bolt 500 pressurizes the upper portions of the pedicle screws 600, the lower ends of the two pedicle screws 600 can be kept in a state of being close to each other, and compression reduction of the vertebral body 700 can be further achieved.
Of course, two fixing bolts 500 and fixing screw holes can be also disposed on the fixing connector 200 and the movable connector 300, the fixing screw holes are all formed along the extending direction of the guide rod 100, the fixing surfaces of the two fixing bolts 500 on the fixing connector 200 are disposed opposite, and the fixing surfaces of the two fixing bolts 500 on the movable connector 300 are disposed opposite, that is, the fixing surface of one fixing bolt 500 on the fixing connector 200 faces the fixing surface of one fixing bolt 500 on the movable connector 300, and the fixing surface of the other fixing bolt 500 on the fixing connector 200 faces the fixing surface of the other fixing bolt 500 on the movable connector 300, so that the two effects of the two embodiments can be achieved, an operator can pressurize the upper portion of the pedicle screw 600 according to practical situations, the lower ends of the two pedicle screws 600 can be far away, the lower ends of the two pedicle screws 600 can be close, and the applicability is better.
In this embodiment, the mounting hole 530 is a rounded rectangular hole, and the inner wall surface of the mounting hole 530 is provided with a supporting boss, and the supporting boss is located below the fixing bolt 500, so that the fixing bolt 500 can be acted as a fulcrum, so as to better achieve the fixing effect. The supporting boss protrudes towards the central axis of the mounting hole 530, and the inner wall surface of the supporting boss also forms a round-corner rectangular hole, the round-corner rectangular hole of the supporting boss is communicated with the mounting hole 530, and the pedicle screw 600 can be inserted into the round-corner rectangular hole formed by the mounting hole 530 and the supporting boss.
In this embodiment, the fixing mechanism further includes a positioning structure movably connected to the fixing surface of the fixing bolt 500, where the positioning structure is provided with a contact surface, and when the fixing bolt 500 is installed in the fixing screw hole, the positioning structure can extend into the installation hole 530, and the contact surface can be abutted to the peripheral wall surface of the pedicle screw 600 installed in the installation hole 530.
It can be appreciated that the positioning structure can be changed according to the angle of the pedicle screw 600, and the contact area of the fixing bolt 500 to the peripheral wall surface of the pedicle screw 600 is increased through the positioning structure, especially when an included angle is formed between the fixing surface of the fixing bolt 500 and the pedicle screw 600, the positioning structure can compensate the included angle, so that the fastening capability of the fixing bolt 500 to the pedicle screw 600 is further improved.
In this embodiment, the fixing surface of the fixing bolt 500 is provided with a groove, the positioning structure includes a ball 520 and an abutment block 510, the groove is an arc groove, the groove wall of the groove is matched with the outer surface of the ball 520, the ball 520 can be embedded in the groove and movably connected with the groove wall of the groove, that is, the ball 520 can rotate in the groove, the abutment block 510 is connected with the ball 520 and protrudes out of the fixing surface, the contact surface of the positioning structure is arranged on the abutment block 510, and the contact surface of the abutment block 510 can be abutted against the peripheral wall surface of the pedicle screw 600 installed in the installation hole 530, thereby realizing the fixation of the pedicle screw 600.
It will be appreciated that since the ball 520 can rotate in the groove, i.e., the direction of the abutment block 510 can be changed, when the pedicle screw 600 is obliquely installed in the installation hole 530, the abutment block 510 can also be changed in direction according to the inclination angle of the pedicle screw 600 to maintain the contact surface in contact with the peripheral wall surface of the pedicle screw 600, thereby securing the fastening function of the pedicle screw 600.
In this embodiment, the rotating surface of the fixing bolt 500 is provided with a rotating hole, the rotating hole is a hexagonal hole, and the socket wrench can be inserted into the rotating hole, so that the fixing bolt 500 can be rotated by rotating the socket wrench, which is very convenient. It is understood that the rotation hole may be a hole of other shapes, and the fixing bolt 500 can be rotated by a tool matching with the rotation hole. Of course, the rotation surface of the fixing bolt 500 may be hexagonal, and the fixing bolt 500 may be rotated by an external hexagonal wrench.
In this embodiment, the movable section of the guide rod 100 is provided with an external thread structure, and the locking mechanism is a nut 400, which has a screw hole with an internal thread structure, and can be sleeved on the movable section of the guide rod 100, and the external thread structure on the movable section is mutually matched and connected with the internal thread structure of the nut 400.
It can be appreciated that when the nut 400 is screwed, the nut 400 can move along the extending direction of the movable section, i.e. can drive the whole movable connector 300 to move along the extending direction of the guide rod 100, so that the distance between the movable connector 300 and the fixed connector 200 can be changed, and the distance between the two pedicle screws 600 can be changed, so as to prop up or compress the vertebral body 700 according to the actual requirement.
In addition, the external thread structure on the guide rod 100 also plays a role of scale, and the rotation number of the nut 400 can be used for recording the spreading distance of the vertebral body 700, thereby being beneficial to recording and analyzing clinical data.
The nut 400 is adopted as a locking mechanism, so that the position of the movable connector 300 on the guide rod 100 can be adjusted, the adjusting mode is simple and convenient, and when the nut 400 is not rotated, the movable connector 300 cannot move along the extending direction of the guide rod 100, thereby realizing the locking of the movable connector 300 and avoiding the influence on the expanding or compressing effect of the pedicle screw 600 due to the movement of the movable connector 300 in the process of expanding or compressing the vertebral body 700 of the pedicle screw 600.
It will be appreciated that the nut 400 is rotatably coupled to the movable connector 300 such that the arrangement of the nut 400 does not interfere with the rotation of the movable connector 300 about the central axis of the guide bar 100. In this embodiment, the nut 400 is provided with a mounting ring 410, and the movable connector 300 is provided with a mounting groove 310, the mounting ring 410 is clamped in the mounting groove 310, and the mounting ring 410 can rotate relative to the groove wall of the mounting groove 310. Due to the mutual restriction of the mounting groove 310 and the mounting ring 410, the nut 400 can drive the movable connector 300 to move along the extending direction of the guide rod 100 when moving along the extending direction of the guide rod 100.
The mounting ring 410 in this embodiment is disposed on the outer peripheral wall surface of the nut 400, that is, the annular hole of the mounting ring 410 is connected to the outer peripheral wall surface of the nut 400, and the outer peripheral wall surface of the mounting ring 410 is rotatably connected to the groove wall of the mounting groove 310.
It can be appreciated that the mounting groove 310 may be a fan-shaped groove, and the opening length of the fan-shaped groove is greater than or equal to the diameter of the mounting ring 410, so that the nut 400 and the movable connector 300 can be disassembled, and when the movable connector 300 and the nut 400 are disassembled from the guide rod 100, the mounting ring 410 of the nut 400 can be disassembled from the mounting groove 310, i.e. the nut 400 can be separated from the movable connector 300, which is more beneficial to the replacement and cleaning of parts.
The mounting groove 310 in this embodiment is a fan-shaped groove with a central angle greater than 180 ° and can increase the stress area between the groove wall of the mounting groove 310 and the mounting ring 410, so that the nut 400 can better drive the movable connector 300 to move along the extending direction of the guide rod 100.
It will be appreciated that the rotational connection between the nut 400 and the moveable connector 300 may be achieved by other arrangements. For example, a circular groove is formed on the outer peripheral wall surface of the nut 400, and a movable block is formed on the movable connector 300, the movable block can be clamped in the circular groove and can rotate around the outer peripheral wall surface of the nut 400 along the circular groove, and the movable connector 300 is driven to move along with the movement of the nut 400 by using the limiting effect between the movable block and the circular groove.
In this embodiment, the outer surface of the nut 400 is provided with splines, so that an operator can rotate the nut 400 by using spline pliers, and the nut 400 can move along the extending direction of the guide rod 100 more conveniently.
In other embodiments, the locking mechanism is a latch, the movable section of the guide rod 100 is provided with a plurality of groups of adjustment holes, and each group has a plurality of adjustment holes, the plurality of adjustment holes in one group are disposed around the outer peripheral wall surface of the guide rod 100, and the plurality of groups of adjustment holes are disposed along the extending direction of the movable section. The movable connector 300 is provided with a through hole structure for installing a bolt, when the movable connector 300 rotates and moves around the guide rod 100, the through hole structure can be communicated with one of the adjusting holes, and after the bolt is arranged in the adjusting hole and the through hole structure in a penetrating mode, locking between the movable connector 300 and the guide rod 100 can be achieved.
It will be appreciated that the steps of locking the connector with the guide rod 100 by the latch are more complicated than those of using the nut 400, which is easy to lose the latch, and the applicability is less, so that the movable connector 300 can be locked with the guide rod 100 only at the position where the through hole structure is communicated with the adjustment hole. In addition, the excessive number of adjustment holes is disadvantageous in cleaning and sterilizing the guide bar 100.
It will be appreciated that although the movable connector 300 can rotate relative to the nut 400, when the movable connector 300 is mounted to the pedicle screw 600, the fixing mechanism ensures that no relative movement occurs between the movable connector 300 and the pedicle screw 600, and the lower end of the pedicle screw 600 abuts against the vertebral body 700, so that the pedicle screw 600 does not rotate under the restriction of the vertebral body 700, i.e., the movable connector 300 does not rotate around the guide rod 100, thereby ensuring the reliability of the operation.
In the actual use process, the fixed connector 200 is first sleeved on the fixing section of the guide rod 100, so that the end face of the fixed connector 200 abuts against the positioning block 110, the fixed connection hole is rotated to align the first connection hole 220 and the second connection hole 120 with each other, and the fixed connector 200 is fixed with the guide rod 100 by the fixing pin 210.
Then, the fixing bolt 500 of the fixing connector 200 is screwed into the fixing screw hole, and one of the pedicle screws 600 is inserted into the mounting hole 530 of the fixing connector 200, so that the lower end of the pedicle screw 600 abuts against the fixed vertebral body 700, and the fixing bolt 500 of the fixing connector 200 is screwed, so that the abutment block 510 of the fixing bolt 500 of the fixing connector 200 abuts against the peripheral wall surface of the pedicle screw 600, thereby ensuring that the pedicle screw 600 does not slide relatively with the fixing connector 200.
The nut 400 and the movable connector 300 are assembled in advance, the nut 400 and the movable connector 300 are sleeved on the movable section of the guide rod 100, the nut 400 is rotated, the nut 400 drives the movable connector 300 to move to a proper position on the movable section, the other pedicle screw 600 is inserted into the mounting hole 530 of the movable connector 300, the lower end of the pedicle screw 600 is abutted with the slipped vertebral body 700, and the pedicle screw 600 is fixed with the movable connector 300 through the fixing screw on the movable connector 300.
Finally, the nut 400 is rotated using the spline clamp such that the nut 400 drives the movable connector 300 to move in the extending direction of the movable section to change the positions of the pedicle screws 600 mounted on the movable connector 300, thereby moving the two pedicle screws 600 away from or toward each other. When the two pedicle screws 600 are far away from each other, the two vertebral bodies 700 can be spread; and when two pedicle screws 600 are close to each other, compression of the two vertebral bodies 700 is enabled.
In summary, the spine stretching device provided by the embodiment of the invention has a simple structure, is beneficial to processing and production, has more reliable spine stretching action, convenient operation and strong practicability in the operation using process, and is suitable for being widely applied to the reduction operation of the fracture vertebral body 700.
While the preferred embodiment of the present application has been described in detail, the application is not limited to the embodiments, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the application, and these modifications and substitutions are intended to be included in the scope of the present application as defined in the appended claims.
Claims (7)
1. A spinal distraction device, comprising:
A guide rod;
The fixed connector is connected with the guide rod;
The movable connector is provided with a movable hole, the guide rod penetrates through the movable hole, the movable connector can rotate around the guide rod and can move along the extending direction of the guide rod, and the movable connector and the fixed connector are respectively provided with a fixing mechanism for fixing pedicle screws;
The locking mechanism is respectively and movably connected with the movable connector and the guide rod so as to lock the distance between the movable connector and the fixed connector;
The fixing connector and the movable connector are respectively provided with a mounting hole and a fixing screw hole, the mounting holes are used for the pedicle screws to penetrate through, the mounting holes are communicated with the fixing screw holes, the fixing connector and the movable connector are also provided with fixing bolts, the fixing bolts penetrate through the fixing screw holes and are connected with the fixing screw holes in a matched mode, the end faces of the fixing bolts can extend into the mounting holes, and the mounting holes, the fixing screw holes and the fixing bolts form the fixing mechanism;
the fixing mechanism further comprises a positioning structure, the positioning structure is movably connected with the end face of the fixing bolt, the positioning structure can extend into the mounting hole, and the positioning mechanism is provided with a contact surface for being abutted with the peripheral wall surface of the pedicle screw;
the end face of the fixing bolt is provided with a groove, the positioning structure comprises a ball and an abutting block, the groove wall of the groove is matched with the outer surface of the ball, the ball is embedded in the groove and movably connected with the groove wall of the groove, the abutting block is connected with the ball and protrudes out of the end face of the fixing bolt, and the abutting block is provided with a contact surface.
2. The spinal column distracting device of claim 1, wherein the locking mechanism is a nut, the guide rod is provided with an external thread structure, the nut is sleeved on the guide rod and is cooperatively connected with the external thread structure, and the nut is rotatably connected with the movable connector.
3. The spinal column distractor of claim 2, wherein the movable connector is provided with a mounting groove, a mounting ring is arranged on the outer peripheral wall surface of the nut, and the mounting ring is rotatably connected with the groove wall of the mounting groove.
4. A spinal distraction device as claimed in claim 3 wherein said mounting ring is removably connected with said mounting slot.
5. The spinal distraction device of claim 1, wherein the fixed connector is removably connected with the guide rod.
6. The spinal distraction device of claim 5, wherein the fixed connector is provided with a first connection hole, the guide rod is provided with a second connection hole, the axis of the second connection hole forms an included angle with the axis of the guide rod, and the spinal distraction device further comprises a fixing pin, and the fixing pin penetrates through the first connection hole and the second connection hole.
7. The spinal distraction device of claim 6, wherein the guide bar is provided with a locating block that abuts the fixed connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211062555.XA CN115568921B (en) | 2022-09-01 | 2022-09-01 | A spinal distraction device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211062555.XA CN115568921B (en) | 2022-09-01 | 2022-09-01 | A spinal distraction device |
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| CN115568921A CN115568921A (en) | 2023-01-06 |
| CN115568921B true CN115568921B (en) | 2024-11-15 |
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| CN202211062555.XA Active CN115568921B (en) | 2022-09-01 | 2022-09-01 | A spinal distraction device |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202982190U (en) * | 2012-12-14 | 2013-06-12 | 上海三友医疗器械有限公司 | Fixing device for injured centrum |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2075949U (en) * | 1990-09-03 | 1991-05-01 | 张家港市医疗器械厂 | Internal fixator for radix arcus vertebrae spinal column |
| US5254118A (en) * | 1991-12-04 | 1993-10-19 | Srdjian Mirkovic | Three dimensional spine fixation system |
| US5746741A (en) * | 1996-05-06 | 1998-05-05 | Tufts University | External fixator system |
| US6413257B1 (en) * | 1997-05-15 | 2002-07-02 | Surgical Dynamics, Inc. | Clamping connector for spinal fixation systems |
| FR2789886B1 (en) * | 1999-02-18 | 2001-07-06 | Dimso Sa | DISTRACTION / CONTRACTION DEVICE FOR A SPINAL OSTEOSYNTHESIS SYSTEM |
| CN101601606A (en) * | 2009-06-30 | 2009-12-16 | 郑修军 | The fixed novel vertebral pedicle bolt structure that is used for that lumbar vertebra compression fracture resets and lumbar spondylolisthesis resets |
| DE102016121054B3 (en) * | 2016-11-04 | 2018-04-05 | Silony Medical International AG | Apparatus for performing distraction or compression of vertebral bodies in a spinal surgery |
| CN106963465A (en) * | 2017-03-29 | 2017-07-21 | 石鹏 | KAFO is fixed in scoliosis in children |
| CN208551990U (en) * | 2017-11-14 | 2019-03-01 | 山东威高骨科材料股份有限公司 | The connector that arc struts or pressurizes |
| CN113827330B (en) * | 2021-10-15 | 2024-10-15 | 郝定均 | Internal fixation system for vertebral anatomy reduction of vertebral fracture and vertebral bone implantation |
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2022
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202982190U (en) * | 2012-12-14 | 2013-06-12 | 上海三友医疗器械有限公司 | Fixing device for injured centrum |
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