CN210447178U

CN210447178U - Measuring assembly for pedicle screw spacing

Info

Publication number: CN210447178U
Application number: CN201920564957.7U
Authority: CN
Inventors: 李成山; 郑卜纵
Original assignee: Shanghai Sanyou Medical Co ltd
Current assignee: Shanghai Sanyou Medical Co ltd
Priority date: 2019-04-23
Filing date: 2019-04-23
Publication date: 2020-05-05
Anticipated expiration: 2029-04-23

Abstract

The utility model provides a measurement element of pedicle screw interval, include: the positioning end of each measuring arm is provided with a positioning part, and the positioning part can be inserted into the accommodating part and is in clearance fit with the accommodating part; a fixed part is arranged on the fixed end of each measuring arm, each fixed part comprises a supporting part, an installation rod is arranged on each supporting part, and the central axis of each installation rod is perpendicular to the central axis of each measuring arm; the supporting part is provided with an angle marking plane which is vertical to the central axis of the mounting rod, and the angle marking plane is provided with an angle dial gauge; the length measuring rod is provided with a length scale table on a length marking plane; the length marking plane is provided with a strip-shaped through hole; two fasteners, fastener mountable pole and length measuring pole detachable connection. The utility model can be used for accurately measuring the distance between two nail bodies in the minimally invasive surgery; even if the nail body is placed at various angles, the accurate reading can still be realized by adjusting the two measuring arms to be parallel.

Description

Measuring assembly for pedicle screw spacing

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a measurement element of pedicle of vertebral arch nail interval.

Background

The posterior spinal nail-rod internal fixation operation is the current mainstream operation method for treating spinal lesions. In recent years, the surgical method has been developed more and more widely because of its many advantages, such as small incision, small wound, small soft tissue injury, and less bleeding. In a general posterior spinal rod internal fixation operation, after two pedicle screws need to be driven in, the two pedicle screws are fixed by using a fixing rod; each pedicle screw comprises a screw body and a screw barrel, one end of the screw barrel is movably connected with the screw body and can rotate relative to the screw body, and the screw barrel is provided with a hollow inner cavity; the length required by the titanium rod for fixing the two pedicle screws is determined according to the distance between the heads of the two screw bodies connected with the screw barrel, and because a small incision is only formed at the accessory of the pedicle screw in the minimally invasive surgery, the heads of the two screw bodies connected with the screw barrel are covered under the skin by soft tissues and cannot be directly measured, so that the problem that how to accurately measure the distance between the heads of the two screw bodies needs to be solved by technicians in the field is solved.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned shortcomings of the prior art, the technical problem solved by the present invention is to provide a pedicle screw spacing measurement assembly.

In order to achieve the above and other related objects, the present invention provides a pedicle screw spacing measuring assembly, wherein the pedicle screw comprises a movably connected screw body and a screw cylinder, the screw cylinder is provided with a receiving portion, the head of the screw body is received in the receiving portion, and the receiving portion and the screw cylinder are coaxially arranged; the pedicle screw spacing measurement assembly comprises: the two ends of each measuring arm are respectively a positioning end and a fixed end, the positioning end of each measuring arm is provided with a positioning component corresponding to the accommodating part, and the positioning component can be inserted into the accommodating part and is in clearance fit with the accommodating part; a fixed part is arranged on the fixed end of each measuring arm, each fixed part comprises a supporting part, an installation rod extending outwards is arranged at one end of each supporting part, and the central axis of each installation rod is perpendicular to the central axis of each measuring arm; the supporting part is provided with an angle marking plane which is vertical to the central axis of the mounting rod, the extending direction of the mounting rod is opposite to the angle marking plane, and the angle marking plane is provided with an angle scale; one side surface of the length measuring rod is a length marking plane, and a length scale is arranged on the length marking plane; a long through hole is formed in the length marking plane, and the length direction of the long through hole is the same as the length direction of the length scale; the length of the supporting part along the axial direction of the measuring arm is greater than the width of the long strip through hole, and the long strip through hole is in clearance fit with the mounting rod in the width direction; two fasteners, the fastener can pass through the installation pole of rectangular through-hole with length measurement pole detachable the connection.

Preferably, the length marking plane of the length measuring rod is further provided with an end through hole in clearance fit with the mounting rod, the central point of the end through hole passes through the central axis of the long strip through hole in the length direction, and the central point of the end through hole is located on the extension line of the length starting scale of the length scale.

Preferably, the maximum distance between the central axis of the mounting rod and the edge of the angle marking plane is smaller than the distance between the central axis of the long through hole and the length scale.

Preferably, the support portion includes a support body and an angle scale portion formed by extending outward from a side surface of the support body, the angle marking plane is located on the angle scale portion, and the mounting rod is connected to the support body.

Preferably, the mounting rod is a threaded rod and the fastener is a nut.

Preferably, the accommodating part is an annular convex part arranged on the inner wall of the nail barrel, and the inner side surface of the annular convex part is circular; the positioning part is a sphere.

Preferably, the inner wall of the nail barrel is provided with two through grooves which are oppositely arranged and communicated with the outside, and the width of each through groove is smaller than the size of the positioning component.

Preferably, the measuring arm is cylindrical, and the diameter of the measuring arm is smaller than the size of the inner side surface of the accommodating part.

As above, the utility model discloses a measurement element of pedicle screw interval has following beneficial effect:

in the distance measuring assembly, the nail body is movably connected with the nail barrel, and the positioning part is inserted into the accommodating part and is in clearance fit with the accommodating part, so that the positioning part can be driven to rotate in the accommodating part by the movement of the measuring arm, and the nail barrel can be driven to move by the movement of the measuring arm; after the positioning parts of the two measuring arms are respectively inserted into the two accommodating parts, the mounting rods of the two measuring arms penetrate through the long through holes, the size of the supporting part is larger than that of the long through holes, the width of the long through holes is in clearance fit with the mounting rods, the two measuring arms are parallel after the mounting rods are connected with the length measuring rods by the two fasteners, and a connecting line of the heads of the nail bodies, the central axes of the two measuring arms and a connecting line of the fixed ends of the two measuring arms can enclose a parallelogram structure; because the supporting part is provided with the angle marking plane which is vertical to the central axis of the mounting rod, the extending direction of the mounting rod is the opposite direction of the angle marking plane, and the central axis of the mounting rod is vertical to the central axis of the measuring arm, the two mounting rods respectively penetrate into the strip-shaped through hole through the length marking plane, and after the two mounting rods are connected with the length measuring rod, the two angle marking planes are positioned on the same side of the length marking plane, and the two angle marking planes are positioned on the same plane; when the same angle scale mark on the angle scales of the two angle marking planes is vertical to the length direction of the length scale, the two measuring arms are parallel; the distance between angle scale lines which are perpendicular to the length direction of the length scale on the angle scale of the two angle marking planes can be calculated through the length scale, so that the distance between the connecting lines of the fixed ends of the two measuring arms can be obtained, and the distance between the connecting lines of the heads of the nail bodies can be obtained according to the principle that the distances between the two opposite sides of the parallelogram structure are equal; the measuring component for the space between the pedicle screws has simple structure and convenient use, and can be used for accurately measuring the distance between two screw bodies in a minimally invasive surgery; the utility model discloses a measuring unit of pedicle of vertebral arch nail interval is fit for being used for accurate percutaneous wicresoft's operation to measure required titanium stick length, even the nail body is put into later becomes various angles, still can be through adjusting two measuring arm parallels accurate readings that come.

Drawings

Fig. 1 is a schematic structural view illustrating a body of a pedicle screw according to the embodiment of the invention when the body is driven into a vertebral body.

Fig. 2 is a schematic structural view of the pedicle screw spacing measurement assembly according to the embodiment.

Fig. 3 shows a structural diagram of the connection between the mounting rod and the fastener of the pedicle screw spacing measurement assembly of the embodiment.

Fig. 4 is a schematic perspective view of the nail barrel of the pedicle screw spacing measurement assembly according to the embodiment.

Fig. 5 is a schematic side view of the nail barrel of the pedicle screw spacing measuring assembly according to the embodiment.

Fig. 6 is a schematic sectional view taken along line a-a of fig. 5.

Fig. 7 is a perspective view of the measuring arm of the pedicle screw spacing measuring assembly according to the embodiment.

Fig. 8 is a perspective view of the fixed end of the measuring arm of the pedicle screw spacing measuring assembly according to the embodiment.

Fig. 9 is a perspective view of the length measuring rod of the pedicle screw spacing measuring assembly according to the embodiment.

Fig. 10 is a perspective view of a fastener of the pedicle screw spacing measurement assembly according to the embodiment.

Description of the reference numerals

10 vertebral body

100 pedicle screw

110 nail body

120 nail barrel

121 accommodating part

122 through groove

200 measuring arm

210 positioning member

220 fixing component

221 supporting part

2211 Angle sign plane

2212 angle dial gauge

2213 supporting body

2214 Angle graduation

222 mounting bar

300 length measuring rod

310 length indicating plane

311 length scale

312 through long strip

313 end through hole

400 fastener

The largest distance between the central axis of the L1 mounting bar and the edge of the angle marking plane

Large distance

Distance between central axis of L2 long-strip through hole and length scale

Detailed Description

The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.

Please refer to the attached drawings. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle", "distal", "proximal" and "a" used in the present specification are used for clarity of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and thus the present invention is considered to be within the scope of the present invention.

As shown in fig. 1 to 10, in the measurement assembly for measuring the distance between the pedicle screws 100 of the present embodiment, the pedicle screw 100 includes a screw body 110 and a screw barrel 120 that are movably connected, the screw body 110 is driven into the vertebral body 10, the screw barrel 120 is provided with a receiving portion 121, the head of the screw body 110 is received in the receiving portion 121, and the receiving portion 121 and the screw barrel 120 are coaxially arranged; the measuring component of the space between the pedicle screws 100 is used for measuring the distance between the heads of the screw bodies 110 of two pedicle screws 100;

a pedicle screw 100 spacing measurement assembly comprising:

two measuring arms 200, two ends of each measuring arm 200 are respectively a positioning end and a fixed end, the positioning end of the measuring arm 200 is provided with a positioning component 210 corresponding to the accommodating part 121, and the positioning component 210 can be inserted into the accommodating part 121 and is in clearance fit with the accommodating part 121; a fixing part 220 is arranged on the fixed end of each measuring arm 200, the fixing part 220 comprises a supporting part 221, one end of the supporting part 221 is provided with an installation rod 222 extending outwards, and the central axis of the installation rod 222 is perpendicular to the central axis of the measuring arm 200; the supporting portion 221 has an angle indicating plane 2211, the angle indicating plane 2211 is perpendicular to the central axis of the mounting rod 222, the extending direction of the mounting rod 222 is opposite to the angle indicating plane 2211, and the angle indicating plane 2211 has an angle scale 2212;

a length measuring rod 300, wherein one side surface of the length measuring rod 300 is a length marking plane 310, and a length scale 311 is arranged on the length marking plane 310; the length marking plane 310 is provided with a long through hole 312, and the length direction of the long through hole 312 is the same as the length direction of the length scale 311; the length of the support part 221 along the axial direction of the measuring arm 200 is greater than the width of the elongated through hole 312, and the elongated through hole 312 is in clearance fit with the mounting rod 222 in the width direction;

two fasteners 400, the fasteners 400 removably connecting the mounting rod 222 passing through the elongated through-hole 312 to the length measuring rod 300.

In the distance measuring assembly, as the nail body 110 is movably connected with the nail barrel 120, the positioning part 210 is inserted into the accommodating part 121 and is in clearance fit with the accommodating part 121, the radial movement of the measuring arm 200 can drive the positioning part 210 to rotate in the accommodating part 121, and the movement of the measuring arm 200 can drive the nail barrel 120 to move;

after the positioning components 210 of the two measuring arms 200 are respectively inserted into the two accommodating parts 121, the mounting rods 222 of the two measuring arms 200 penetrate through the long through holes 312, and since the size of the supporting part 221 is larger than the width of the long through holes 312, the width of the long through holes 312 is in clearance fit with the mounting rods 222, after the two fasteners 400 connect the mounting rods 222 with the length measuring rod 300, the two measuring arms 200 are parallel, and then the connecting line of the heads of the nail body 110, the central axes of the two measuring arms 200 and the connecting line of the fixed ends of the two measuring arms 200 can be enclosed into a parallelogram structure;

since the supporting portion 221 has the angle marking plane 2211, the angle marking plane 2211 is perpendicular to the central axis of the mounting rod 222, the extending direction of the mounting rod 222 is opposite to the angle marking plane 2211, and the central axis of the mounting rod 222 is perpendicular to the central axis of the measuring arm 200, two mounting rods 222 respectively pass through the length marking plane 310 and penetrate into the long through hole 312, and after the two mounting rods 222 are connected to the length measuring rod 300, the two angle marking planes 2211 are located on the same side of the length marking plane 310, and the two angle marking planes 2211 are located on the same plane; and when the same angle scale line on the angle scale 2212 of the two angle marking planes 2211 is perpendicular to the length direction of the length scale 311, the two measuring arms 200 are parallel; through the length scale table 311, the distance between the angle scale lines perpendicular to the length direction of the length scale table 311 on the angle scale table 2212 of the two angle marking planes 2211 can be calculated, so that the distance between the connecting lines of the fixed ends of the two measuring arms 200 can be obtained, and the distance between the connecting lines of the heads of the nail bodies 110 can be obtained according to the principle that the distances between the two opposite sides of the parallelogram structure are equal.

The length marking plane 310 of the length measuring rod 300 is further provided with an end through hole 313 in clearance fit with the mounting rod 222, the center point of the end through hole 313 passes through the central axis of the long through hole 312 in the length direction, and the center point of the end through hole 313 is located on the extension line of the length starting scale of the length scale 311. The mounting rod 222 of one of the two measuring arms 200 is inserted into the end through hole 313, and the fastener 400 detachably connects the mounting rod 222 passing through the end through hole 313 to the length measuring rod 300. As long as the other measuring arm 200 is adjusted to a position parallel to the measuring arm 200 inserted into the end portion through hole 313, the value on the length scale 311 corresponding to the angle scale line perpendicular to the length direction of the length scale 311 on the other measuring arm 200 is the distance between the fixed ends of the two measuring arms 200, which can facilitate the acquisition of the distance value.

The maximum distance L1 between the center axis of the mounting bar 222 and the edge of the angle marking plane 2211 is less than the distance L2 between the center axis of the elongated through-hole 312 and the length scale 311. This structure can guarantee that when the staff is observing length scale 311 and angle scale 2212, length scale 311 can not be sheltered from to angle scale 2212.

In this embodiment, in order to facilitate reading the numerical values, the two length scales 311 are arranged in parallel; the angle scale 2212 is at the edge of the angle marking plane 2211.

The supporting portion 221 includes a supporting body 2213 and an angle graduation portion 2214 formed by extending outward from a side surface of the supporting body 2213, the angle marking plane 2211 is located on the angle graduation portion 2214, and the mounting rod 222 is connected with the supporting body 2213. This configuration enables the angle scale 2212 on the angle scale 2214 to be closer to the length scale 311 on the length measuring rod 300, which facilitates the reading of the numerical value by the operator.

In this embodiment, the angle scaling portion 2214 is a plate, the plane of the support body 2213 connected to the mounting rod 222 and the side of the angle scaling portion 2214 close to the mounting rod 222 are coplanar, and this structure makes the contact surface of the support portion 221 with the elongated through hole 312 larger, so that the connection of the mounting rod 222 to the length measuring rod 300 is more stable.

Mounting stem 222 is a threaded rod and fastener 400 is a nut. The structure is simple, the processing is convenient, and the disassembly and the assembly are convenient.

Since the accommodating part 121 is generally an annular convex part arranged on the inner wall of the nail barrel 120, and the inner side surface of the annular convex part is circular; the positioning member 210 is a sphere. This structure facilitates the movement of the positioning member 210 in the accommodating part 121.

Since the inside wall of the nail barrel 120 is generally provided with two through slots 122 which are oppositely arranged and communicated with the outside, in order to ensure that the positioning component 210 cannot slide out of the through slots 122, the width of the through slots 122 is smaller than the size of the positioning component 210. In this embodiment, the positioning member 210 is a sphere, and the width of the through slot 122 is smaller than the diameter of the positioning member 210.

The measuring arm 200 is cylindrical, and the diameter of the measuring arm 200 is smaller than the size of the inner side surface of the accommodating part 121. This structure enables the measuring arm 200 to stably protrude into the receiving portion 121.

The use method of the pedicle screw 100 spacing measurement assembly of the embodiment comprises the following steps:

1) after the nail bodies 110 of the two pedicle screws 100 are driven into the vertebral body 10, the positioning parts 210 of the two measuring arms 200 are respectively inserted into the two accommodating parts 121, the mounting rod 222 of one measuring arm 200 of the two measuring arms 200 passes through the length marking plane 310 of the length measuring rod 300 and penetrates into the end part through hole 313, the mounting rod 222 and the length measuring rod 300 are fixedly connected by the fastener 400, and the length marking plane 310 is pressed by the supporting part 221; at this time, the worker obtains an angle value of one measuring arm 200 of the two measuring arms 200 by observing the angle scale line in the angle scale 2212 corresponding to the length start scale of the length scale 311, and the angle value is a reference angle value;

2) the mounting rod 222 of the other measuring arm 200 of the two measuring arms 200 passes through the length marking plane 310 of the length measuring rod 300 and penetrates into the long through hole 312, and the supporting part 221 is in contact with the length marking plane 310; moving the mounting rod 222 in the long through hole 312 until the angle scale line on the angle scale 2212 of the other measuring arm 200 of the two measuring arms 200, which has the same value as the reference angle, can be perpendicular to the length direction of the length scale 311, and then the two measuring arms 200 are parallel; at this time, the fastener 400 fixedly connects the mounting bar 222 of the other measuring arm 200 of the two measuring arms 200 with the length measuring bar 300;

3) by reading the distance between the angle scales perpendicular to the length direction of the length scale 311 on the angle scale 2212 of the two angle marking planes 2211 through the length scale 311, the distance between the fixed ends of the two measuring arms 200 is obtained.

The utility model discloses a measurement element of 100 intervals of pedicle of vertebral arch nail simple structure, convenient to use can be arranged in the distance between two nail bodies 110 of accurate measurement in the minimal access surgery, can reachd the length of required titanium stick promptly. The utility model discloses a measurement element of pedicle of vertebral arch nail 100 interval is fit for being used for accurate percutaneous wicresoft's operation to measure required titanium stick length, even nail body 110 puts into later becomes various angles, still can be through adjusting two measurement arms 200 and parallel come accurate reading.

To sum up, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A pedicle screw spacing measuring assembly is characterized in that a pedicle screw (100) comprises a screw body (110) and a screw barrel (120) which are movably connected, a containing part (121) is arranged in the screw barrel (120), the head part of the screw body (110) is contained in the containing part (121), and the containing part (121) and the screw barrel (120) are coaxially arranged; the method is characterized in that:

the pedicle screw spacing measurement assembly comprises:

two measuring arms (200), wherein two ends of each measuring arm (200) are respectively a positioning end and a fixed end, the positioning end of each measuring arm (200) is provided with a positioning component (210) corresponding to the accommodating part (121), and the positioning component (210) can be inserted into the accommodating part (121) and is in clearance fit with the accommodating part (121); a fixing component (220) is arranged on the fixed end of each measuring arm (200), the fixing component (220) comprises a supporting part (221), one end of the supporting part (221) is provided with an installation rod (222) extending outwards, and the central axis of the installation rod (222) is perpendicular to the central axis of the measuring arm (200); the support part (221) is provided with an angle marking plane (2211), the angle marking plane (2211) is perpendicular to the central axis of the mounting rod (222), the extending direction of the mounting rod (222) is opposite to the angle marking plane (2211), and the angle marking plane (2211) is provided with an angle scale (2212);

a length measuring rod (300), wherein one side surface of the length measuring rod (300) is a length marking plane (310), and a length scale table (311) is arranged on the length marking plane (310); a long strip through hole (312) is formed in the length marking plane (310), and the length direction of the long strip through hole (312) is the same as the length direction of the length scale table (311); the length of the supporting part (221) along the axial direction of the measuring arm (200) is larger than the width of the strip through hole (312), and the strip through hole (312) is in clearance fit with the mounting rod (222) in the width direction;

two fasteners (400), the fasteners (400) being adapted to removably connect the mounting rod (222) passing through the elongated through-hole (312) to the length measuring rod (300).

2. The pedicle screw spacing measurement assembly according to claim 1, wherein:

the length marking plane (310) of the length measuring rod (300) is further provided with an end through hole (313) in clearance fit with the mounting rod (222), the central point of the end through hole (313) passes through the central axis of the long through hole (312) in the length direction, and the central point of the end through hole (313) is located on the extension line of the length starting scale of the length scale (311).

3. The pedicle screw spacing measurement assembly according to claim 1, wherein:

the maximum distance between the central axis of the mounting rod (222) and the edge of the angle marking plane (2211) is smaller than the distance between the central axis of the strip through hole (312) and the length scale (311).

4. The pedicle screw spacing measurement assembly according to claim 1, wherein:

the support part (221) includes a support body (2213) and an angle scale portion (2214) formed by extending outward from a side surface of the support body (2213), the angle indicating plane (2211) is on the angle scale portion (2214), and the mounting rod (222) is connected with the support body (2213).

5. The pedicle screw spacing measurement assembly according to claim 1, wherein:

the mounting rod (222) is a screw rod, and the fastening piece (400) is a nut.

6. The pedicle screw spacing measurement assembly according to claim 1, wherein:

the accommodating part (121) is an annular convex part arranged on the inner wall of the nail barrel (120), and the inner side surface of the annular convex part is circular;

the positioning part (210) is a sphere.

7. The pedicle screw spacing measurement assembly according to claim 1, wherein:

two through grooves (122) which are oppositely arranged and communicated with the outside are formed in the inner wall of the nail barrel (120), and the width of each through groove (122) is smaller than the size of the positioning component (210).

8. The pedicle screw spacing measurement assembly according to claim 1, wherein:

the measuring arm (200) is cylindrical, and the diameter of the measuring arm (200) is smaller than the size of the inner side face of the accommodating part (121).