CN211883992U - A pedicle of vertebral arch ware of opening a way for spinal surgery - Google Patents

Abstract

The utility model relates to a vertebral pedicle road opener for spinal surgery, which comprises a road opening cone, a connecting part and a handle part; the connecting part comprises an inner rod, an outer sleeve and a spring, the near end of the inner rod extends into the outer sleeve and is telescopically connected into the outer sleeve through the spring, the inner rod is provided with a scale, the outer sleeve is provided with a display window, and the display window is marked with scale marks; the open cone is connected to the far end of the inner rod extending out of the outer sleeve, and the handle part is connected to the near end of the outer sleeve; the utility model discloses the position according to scale mark on interior pole on the display window reads relative displacement numerical value, according to relative displacement numerical value to open the pointed end position of way awl confirm in real time and adjust, realize that the nail says that the position is real-time, safe effective detection, improve and put the accuracy of nail.

Description

A pedicle of vertebral arch ware of opening a way for spinal surgery

Technical Field

The utility model relates to a pedicle of vertebral arch ware of opening a way for spinal surgery belongs to medical instrument technical field.

Background

Currently, in the clinical operation of spinal surgery, the pedicle screw technology has better mechanical strength and orthopedic effect of vertebral body derotation compared with other internal fixation technologies, the application of the pedicle screw technology is very common, and the pedicle screw technology has milestone significance in the development history of spinal surgery. The pedicle of vertebral arch is the narrowest tubular structure connecting the vertebral body and the vertebral plate, and in clinical operation, because the pedicle of vertebral arch structure can not be seen directly, pedicle of vertebral arch screws must pass through the narrow bony structure and enter the vertebral body from the vertebral plate to complete the three-column fixation, so that great risk exists. If the screw is placed out of the pedicle, important tissues can be damaged, so that serious iatrogenic injury is caused: the nerve root is possibly damaged both upwards and downwards, and sensory and motor dysfunction of one limb after operation is caused; deviation inward may damage the spinal cord or cauda equina leading to more severe neurological dysfunction, paraplegia or faecal dysfunction; too deep may damage the esophagus, large blood vessels in the mediastinum, and abdominal aorta, which are important tissues in front of the vertebral body; while the offset pedicle screws also do not provide adequate fixation.

The currently used tool is a simple opener, also called a bone awl, when in operation, a surgeon holds a bone awl handle to drill a nail channel towards the vertebral pedicle, and judges whether the breaker is in the vertebral pedicle or not, only by hand feeling or experience, then uses a probe to detect whether each wall of the nail channel is complete or not, then inserts a marking needle, and then uses an X-ray machine to confirm the position of the nail channel by perspective, and re-drills the nail channel if the position is not ideal. In fact, many times there is a risk of damaging surrounding vital tissues as long as the screw way deviates from the pedicle. How to safely and effectively drill a nail path in an operation and detect the position of the nail path in real time so as to improve the nail placing accuracy is an urgent problem to be solved.

Disclosure of Invention

In view of the above problems, the present invention provides a pedicle of vertebral arch device for spinal surgery, which has simple structure, convenient use and accurate nail placement.

In order to achieve the purpose, the utility model adopts the following technical proposal that the pedicle of vertebral arch open-circuit device used for spinal surgery comprises an open-circuit cone, a connecting part and a handle part; the connecting part comprises an inner rod, an outer sleeve and a spring, the near end of the inner rod extends into the outer sleeve and is telescopically connected into the outer sleeve through the spring, the inner rod is provided with a scale, the outer sleeve is provided with a display window, and the display window is marked with scale marks; the open cone is connected to the far end of the inner rod extending out of the outer sleeve, and the handle part is connected to the near end of the outer sleeve.

Preferably, the inner rod is a reducing rod and comprises a connecting rod section and a reducing rod section which are integrally formed, a step is formed at the joint between the connecting rod section and the reducing rod section, and an annular boss is formed on the inner wall of the outer sleeve; the reducing rod section of the inner rod is located in the outer sleeve, the near end of the reducing rod section penetrates through the annular boss, a clamping ring is arranged on the near end of the reducing rod section, the lower end face of the clamping ring is overlapped on the upper end face of the annular boss, the spring sleeve is arranged between the step and the annular boss and outside the reducing rod section, and the far end of the connecting rod section extends out of the far end of the outer sleeve and is connected with the open-circuit cone.

Preferably, the scale is provided on the connecting rod section, and the display window is provided near a distal end of the outer sleeve.

Preferably, a limiting structure is arranged between the inner rod and the outer sleeve, and the relative rotation between the inner rod and the outer sleeve can be limited.

Preferably, the limiting structure comprises a plurality of convex parts which are arranged on the inner rod and are arranged at intervals along the circumferential direction of the inner rod, and a plurality of groove parts which extend along the axial direction of the inner wall of the outer sleeve and are arranged at intervals along the circumferential direction of the inner wall; the convex part is axially and slidably arranged in the groove part;

or, limit structure including form in the prism section on the interior pole with form in a plurality of recesses on the inner wall of outer tube, a plurality of recesses are in the circumference equipartition of outer tube is arranged, and follows the axial extension of outer tube, a plurality of edges and corners of prism section with a plurality of recess one-to-one cooperation.

Preferably, a limiting structure is arranged between the connecting rod section and the outer sleeve, and the relative rotation between the inner rod and the outer sleeve can be limited.

Preferably, the limiting structure comprises a plurality of convex parts which are arranged on the connecting rod section and are arranged at intervals along the circumferential direction of the connecting rod section, and a plurality of groove parts which are arranged on the inner wall of the outer sleeve tube along the axial direction of the outer sleeve tube and are arranged at intervals along the circumferential direction of the outer sleeve tube; the convex part is axially and slidably arranged in the groove part;

or, limit structure including form in prism section on the connecting rod section with form in a plurality of recesses on the inner wall of outer tube, a plurality of recesses are in the circumference equipartition of outer tube is arranged, and follows the axial extension of outer tube, a plurality of edges and corners of prism section with a plurality of recess one-to-one cooperation.

Preferably, the open cone comprises a cylindrical section and a pyramid section which are integrally formed, and the proximal end of the cylindrical section is fixedly connected with the distal end of the inner rod.

Preferably, the open-circuit cone and the inner rod are integrally formed; the open-circuit cone is made of alloy materials; and the open cone is marked with scale lines.

Preferably, the snap ring is a nut that is threaded onto the proximal end of the reduced diameter stem section of the inner stem.

The utility model discloses owing to take above technical scheme, it has following advantage: the utility model discloses an open road awl, connecting portion and handle portion, connecting portion include interior pole, outer tube and spring, are provided with the scale on the interior pole, have seted up the display window on the outer tube, are marked with the scale mark on the display window, and the position according to the scale mark on interior pole on the display window reads relative displacement numerical value, carries out real-time confirmation and adjustment to the most advanced position of open road awl according to relative displacement numerical value, realizes that the nail way position is real-time, safe effective detection, improves the accuracy of putting the nail.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a perspective structure diagram of the present invention;

FIG. 3 is a schematic cross-sectional view of the inner rod and the outer sleeve of the present invention;

fig. 4 is a schematic view of a first spacing structure of the present invention;

fig. 5 is a schematic view of a second limit structure of the present invention;

fig. 6 is a schematic view of a third limiting structure of the present invention.

Detailed Description

The invention is described in detail below with reference to the figures and examples. It is to be understood, however, that the drawings are provided solely for the purposes of promoting an understanding of the invention and that they are not to be construed as limiting the invention.

It should be noted that all the directional indicators (such as the near end, the far end, the front end, the rear end, etc.) in the present embodiment are only used to explain the relative positional relationship, the motion situation, etc. of the components in the general operation posture, that is, the side close to the operator is referred to as the near end or the rear end, and the side far away from the operator is referred to as the far end or the front end; if the operating posture changes, the directional indication changes accordingly.

As shown in fig. 1 and 2, the present invention provides a pedicle opener for spinal surgery, which comprises an opening awl 1, a connecting part 2 and a handle part 3; the connecting part 2 comprises an inner rod 21, an outer sleeve 22 and a spring 23, the near end of the inner rod 21 extends into the outer sleeve 22 and is telescopically connected into the outer sleeve 22 through the spring 23, the inner rod 21 is provided with a scale 4, the outer sleeve 22 is provided with a display window 5, and the display window 5 is marked with scale marks; the open-end cone 1 is attached to the distal end of the inner rod 21 extending out of the outer sleeve 22, and the handle portion 3 is attached to the proximal end of the outer sleeve 22.

In a preferred embodiment, as shown in fig. 3, the inner rod 21 is a reducing rod, which comprises a connecting rod section 211 and a reducing rod section 212 that are integrally formed, a step 213 is formed at the joint between the connecting rod section 211 and the reducing rod section 212, and an annular boss 221 is formed on the inner wall of the outer sleeve 22; the reducing rod section 212 of the inner rod 21 is positioned in the outer sleeve 22, the proximal end of the reducing rod section 212 penetrates through the annular boss 221, the proximal end of the reducing rod section 212 is provided with a snap ring 214, the lower end face of the snap ring 214 is lapped on the upper end face of the annular boss 221, the spring 23 is sleeved outside the reducing rod section 212 positioned between the step 213 and the annular boss 221, and the distal end of the connecting rod section 211 extends out of the distal end of the outer sleeve 22 and is connected with the open-road cone 1.

In a preferred embodiment, the scale 4 is provided on the connecting rod section 211 and the display window 5 is provided near the distal end of the outer sleeve 22.

In a preferred embodiment, the snap ring 214 may be a nut that is threaded onto the proximal end of the reduced diameter shaft section 212 of the inner shaft 21.

In a preferred embodiment, a limiting structure is provided between the inner rod 21 and the outer sleeve 22 to limit the relative rotation between the inner rod 21 and the outer sleeve 22, and to ensure that only relative axial movement can occur between the inner sleeve 21 and the outer sleeve 22.

In a preferred embodiment, the limiting structure comprises a plurality of convex portions 6 arranged on the inner rod 21 and arranged at intervals along the circumference thereof, and a plurality of groove portions 7 extending on the inner wall of the outer sleeve 22 along the axial direction thereof and arranged at intervals along the circumference thereof; the convex portion 6 is axially slidably provided in the groove portion 7.

In a preferred embodiment, as shown in fig. 4, the protrusions 6 are triangular protrusions and the grooves 7 are V-grooves.

In a preferred embodiment, as shown in fig. 5, the protrusion 6 is a rectangular protrusion and the groove 7 is a U-shaped groove.

In a preferred embodiment, as shown in fig. 6, the limiting structure includes a prism section formed on the inner rod 21 and a plurality of grooves formed on the inner wall of the outer sleeve 22, the grooves are uniformly distributed in the circumferential direction of the outer sleeve 22 and extend in the axial direction of the outer sleeve 22, and a plurality of edges of the prism section are matched with the grooves in a one-to-one correspondence manner.

In a preferred embodiment, a limiting structure is provided between connecting rod segment 211 and outer sleeve 22, which limits the relative rotation between inner rod 21 and outer sleeve 22;

the limiting structure comprises a plurality of convex parts 6 which are arranged on the connecting rod section 211 and are arranged at intervals along the circumferential direction of the connecting rod section, and a plurality of groove parts 7 which extend along the axial direction of the inner wall of the outer sleeve 22 and are arranged at intervals along the circumferential direction of the inner wall; the convex portion 6 is axially slidably provided in the groove portion 7.

In a preferred embodiment, the protrusions 6 are triangular protrusions and the grooves 7 are V-grooves.

In a preferred embodiment, the protrusions 6 are rectangular protrusions and the grooves 7 are U-shaped grooves.

In a preferred embodiment, the limiting structure comprises a prism section formed on the connecting rod section 211 and a plurality of grooves formed on the inner wall of the outer sleeve 22, the grooves are uniformly distributed in the circumferential direction of the outer sleeve 22 and extend along the axial direction of the outer sleeve 22, and a plurality of edges and corners of the prism section are matched with the grooves in a one-to-one correspondence manner.

In a preferred embodiment, the groove is V-shaped or U-shaped, but is not limited thereto, as long as the corners of the prism segments can be clamped to limit the relative rotation of the inner rod 21 and the outer sleeve 22.

In a preferred embodiment, the open-road cone 1 comprises an integrally formed cylindrical section 11 and a pyramid section 12, and the proximal end of the cylindrical section 11 is fixedly connected with the distal end of the inner rod 21.

In a preferred embodiment, the open cone 1 is integrally formed with the inner rod 21.

In a preferred embodiment, the inner rod 21 is 6 cm long, the cylindrical section 11 is 8 cm long, and the pyramid section 12 is 3 cm long.

In a preferred embodiment, the open cone 1 is made of an alloy material.

In a preferred embodiment, the open-road cone 1 is marked with scale marks, and the depth of the nail path is judged according to the scale marks on the open-road cone 1.

In a preferred embodiment, the inner rod 21 and the outer sleeve 22 are a clearance fit such that the inner rod 21 can move axially relative to the outer sleeve 22 with a large overlap and a small clearance, which limits lateral bending between the inner rod 21 and the outer sleeve 22.

The working principle of the utility model is as follows:

when the open-circuit cone 1 is used for drilling a nail path, the inner rod 21 is pushed to move axially in the outer sleeve 22, the spring 23 is extruded, the inner rod 21 and the outer sleeve 22 generate relative displacement after the spring is compressed, and the relative displacement is displayed on the display window 5. Because the difference of the strengths of the cancellous bone and the cortical bone is large, the open-road cone 1 contacts the cortical bone before the nail drilling path begins or ends, so that the relative displacement displayed on the display window 5 before the nail drilling path begins or ends is large, the relative displacement when the nail drilling path begins is taken as a threshold, and the tip position of the open-road cone 1 is confirmed and adjusted in real time according to the comparison between the relative displacement displayed on the display window 5 and the threshold in the process of screwing the open-road cone 1 into the pedicle of the vertebral arch.

The specific operation process is as follows: in the operation, before preparing to drill the nail path, the surgeon contacts the pedicle entering point on the vertebral lamina and penetrates through the cortical bone of the vertebral lamina, at the moment, the relative displacement value is read according to the position of the scale mark 4 on the inner rod 21 on the display window 5, the value is used as a threshold value, the surgeon holds the handle part 3 to slowly drill the open awl 1 in a rotating mode along the axial center direction of the vertebral pedicle, the relative displacement value read on the display window 5 is compared with the threshold value, if the numerical value exceeds the threshold value, the surgeon should stop the operation at the moment, the tip position of the open awl 1 can be confirmed in the operation through perspective or the direction can be directly adjusted until the relative displacement value read from the display window 5 is smaller than the threshold value; judging the depth of the nail path according to the scale lines on the open-circuit cone 1; after the tip of the open-circuit cone 1 enters the vertebral body, if the relative displacement value read from the display window 5 is higher than or equal to the threshold value again, the tip possibly reaches the front edge of the vertebral body, at the moment, the operation should be stopped, the open-circuit device is withdrawn, after the pedicle screw channel is manufactured, the marking needle is inserted, and the position is confirmed in a perspective mode. The utility model discloses a pedicle of vertebral arch way opener utilizes the intensity difference nature of cancellous bone and cortical bone to combine the contrast of relative displacement numerical value and threshold value that reads on the 1 screw in pedicle of vertebral arch in-process display window 5 of way awl of opening, confirm in real time and adjust the most advanced position of way awl 1, realize that the nail says that the position is real-time, safe effective detection, improve the accuracy of putting the nail.

The utility model has the advantages that the device is required to be lightly held and placed no matter in use or in storage, so that the accuracy is kept; meanwhile, in the using process, attention is paid to avoid contacting the junction of the inner rod and the outer sleeve of the opener so as to avoid generating errors.

The present invention has been described only with reference to the above embodiments, and the structure, arrangement position and connection of the components may be changed. On the basis of the technical scheme of the utility model, the all sides according to the utility model discloses the principle is all not excluded to the improvement that individual part goes on or the transform of equivalence the utility model discloses a protection scope is outside.

Claims (10)

1. A pedicle distractor for use in spinal surgery, comprising:

comprises an open cone (1), a connecting part (2) and a handle part (3); the connecting part (2) comprises an inner rod (21), an outer sleeve (22) and a spring (23), the near end of the inner rod (21) extends into the outer sleeve (22) and is telescopically connected into the outer sleeve (22) through the spring (23), a scale (4) is arranged on the inner rod (21), a display window (5) is arranged on the outer sleeve (22), and scale marks are marked on the display window (5); the open-circuit cone (1) is connected to the far end of the inner rod (21) extending out of the outer sleeve (22), and the handle part (3) is connected to the near end of the outer sleeve (22).

2. A pedicle distractor for use in spinal surgery as claimed in claim 1, wherein:

the inner rod (21) is a variable-diameter rod and comprises a connecting rod section (211) and a reducing rod section (212) which are integrally formed, a step (213) is formed at the joint between the connecting rod section (211) and the reducing rod section (212), and an annular boss (221) is formed on the inner wall of the outer sleeve (22); the reducing rod section (212) of interior pole (21) is located in outer tube (22), the near-end of reducing rod section (212) passes annular boss (221), just be equipped with snap ring (214) on the near-end of reducing rod section (212), the lower terminal surface overlap joint of snap ring (214) is in on the up end of annular boss (221), spring (23) cover is put and is located between step (213) and annular boss (221) the outside of reducing rod section (212), the distal end of connecting rod section (211) stretches out the distal end of outer tube (22) and with open a way awl (1) is connected.

3. A pedicle distractor for use in spinal surgery as claimed in claim 2, wherein:

the scale (4) is arranged on the connecting rod section (211), and the display window (5) is arranged close to the far end of the outer sleeve (22).

4. A pedicle distractor for use in spinal surgery as claimed in claim 1, wherein:

a limiting structure is arranged between the inner rod (21) and the outer sleeve (22) and can limit the relative rotation between the inner rod (21) and the outer sleeve (22).

5. A pedicle distractor for use in spinal surgery as claimed in claim 4, wherein:

the limiting structure comprises a plurality of convex parts (6) which are arranged on the inner rod (21) and are circumferentially arranged at intervals along the inner rod (21), and a plurality of groove parts (7) which extend along the axial direction of the inner wall of the outer sleeve (22) and are circumferentially arranged at intervals; the convex part (6) is axially and slidably arranged in the groove part (7);

or, limit structure including form in the prism section on interior pole (21) with form in a plurality of recesses on the inner wall of outer tube (22), a plurality of recesses are in the circumference equipartition of outer tube (22) is arranged, and follows the axial extension of outer tube (22), a plurality of edges and corners of prism section with a plurality of recess one-to-one cooperation.

6. A pedicle distractor for use in spinal surgery as claimed in claim 2, wherein:

a limiting structure is arranged between the connecting rod section (211) and the outer sleeve (22) and can limit the relative rotation between the inner rod (21) and the outer sleeve (22).

7. A pedicle distractor for use in spinal surgery as claimed in claim 6, wherein:

the limiting structure comprises a plurality of convex parts (6) which are arranged on the connecting rod section (211) and are arranged at intervals along the circumferential direction of the connecting rod section, and a plurality of groove parts (7) which extend on the inner wall of the outer sleeve (22) along the axial direction of the outer sleeve and are arranged at intervals along the circumferential direction of the outer sleeve; the convex part (6) is axially and slidably arranged in the groove part (7);

or, limit structure including form in prism section on connecting rod section (211) and form in a plurality of recesses on the inner wall of outer tube (22), a plurality of recesses are in the circumference equipartition of outer tube (22) is arranged, and follows the axial extension of outer tube (22), a plurality of edges and corners of prism section with a plurality of recess one-to-one cooperation.

8. A pedicle distractor for use in spinal surgery as claimed in claim 1, wherein:

the open-circuit cone (1) comprises a cylindrical section (11) and a pyramid section (12) which are integrally formed, and the near end of the cylindrical section (11) is fixedly connected with the far end of the inner rod (21).

9. A pedicle distractor for use in spinal surgery as claimed in claim 8, wherein:

the open-circuit cone (1) and the inner rod (21) are integrally formed; the open-circuit cone (1) is made of alloy materials; the open-circuit cone (1) is marked with scale marks.

10. A pedicle distractor for use in spinal surgery as claimed in claim 2, wherein:

the snap ring (214) is a nut that is threaded onto the proximal end of the reduced diameter stem section (212) of the inner stem (21).

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