Dilator

Abstract

The application provides a distraction device, which comprises a core rod, an inner sleeve sleeved on the core rod, an inner side surface of the inner sleeve being connected with an outer side surface of the core rod through a screw pair, a driving sleeve sleeved on the inner sleeve, an inner side surface of the driving sleeve being connected with an outer side surface of the inner sleeve through a screw pair, an outer side surface of the driving sleeve being provided with a driving cylinder rotating piece, and an outer sleeve sleeved on the driving sleeve, an outer side surface of the outer sleeve being provided with an outer edge part, the outer edge part being detachably connected with the driving cylinder rotating piece. The distraction device is simple in structure and convenient to operate, and can save operation time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of surgical channel establishment devices, in particular to a distraction device. BACKGROUND

[0002] Before installing a pedicle screw, the skin tissue below the skin incision and directly to the bone surface needs to be stripped and cleaned, and then a distraction device is placed to form a surgical channel. The existing distraction device includes a guide wire and a step-by-step distraction sleeve assembly, and the step-by-step distraction sleeve assembly includes an inner sleeve that can be sleeved on the guide wire, an intermediate pipe that can be sleeved outside the inner sleeve, and an outer pipe that can be sleeved outside the intermediate pipe. When the existing distraction device is used, after the guide wire is inserted into the installation position of the pedicle screw, the inner sleeve, the intermediate pipe and the outer pipe are sequentially sleeved, and after the guide wire, the inner sleeve and the intermediate pipe are removed, the inside of the outer pipe is the surgical channel. Using the existing distraction device requires taking the inner sleeve, the intermediate pipe and the outer pipe to be sleeved respectively, and after the surgical channel is formed, the inner sleeve and the intermediate pipe need to be removed respectively. The existing distraction device has complicated operation steps, which wastes the operation time. SUMMARY

[0003] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present application is to provide a distraction device which is simple in structure, simple in operation steps and can save operation time.

[0004] To achieve the above-mentioned purpose and other related purposes, the present application provides a distraction device, comprising:

[0005] a core rod;

[0006] an inner sleeve sleeved on the core rod, the inner side surface of the inner sleeve being connected with the outer side surface of the core rod through a screw pair;

[0007] a driving sleeve sleeved on the inner sleeve, the inner side surface of the driving sleeve being connected with the outer side surface of the inner sleeve through a screw pair, and the outer side surface of the driving sleeve being provided with a driving cylinder rotating piece;

[0008] an outer sleeve sleeved on the driving sleeve, the outer side surface of the outer sleeve being provided with an outer edge part, and the outer edge part being detachably connected with the driving cylinder rotating piece.

[0009] Preferably, the outer side surface of the core rod is provided with a rod body outer thread, the inner side surface of the inner sleeve is provided with an inner sleeve protrusion matched with the rod body outer thread, and the inner sleeve protrusion and the rod body outer thread form a screw pair connection.

[0010] Preferably, the inner sleeve is provided with an inner sleeve outer thread on the outer side surface, the driving sleeve is provided with a driving sleeve protrusion matched with the inner sleeve outer thread on the inner side surface, and the driving sleeve protrusion and the inner sleeve outer thread form a screw pair connection.

[0011] Preferably, the driving sleeve rotating part is provided with a protrusion on the bottom surface, and the outer edge part is provided with a receiving hole for the protrusion.

[0012] Preferably, the inner sleeve is provided with a positioning protrusion on the outer side surface of the lower part.

[0013] Preferably, the core rod is provided with a rod knob.

[0014] Preferably, the inner sleeve is provided with an inner sleeve knob.

[0015] Preferably, the outer sleeve is provided with an outer sleeve outer thread on the outer side surface.

[0016] Preferably, the inner sleeve of the distraction device can be placed in the guide through hole of the guide, and the guide is connected to the mechanical arm of the surgical robot.

[0017] As described above, the distraction device of the present application has the following beneficial effects:

[0018] When the distraction device of the present application is used, first, the distraction device is moved to the surgical site where the distraction operation needs to be performed; then, the inner sleeve is held, the core rod is rotated, and the core rod is moved downward into the skin and stopped at the bone surface; then, the core rod is held, the inner sleeve is rotated, and the inner sleeve is moved downward into the skin and stopped at the bone surface; then, the inner sleeve is held, the driving sleeve is rotated, and the driving sleeve drives the outer sleeve to move downward into the skin and stops at the preset position; finally, the outer sleeve is pressed, the outer sleeve is separated from the driving sleeve, and the driving sleeve drives the inner sleeve and the core rod to be pulled out; the inner hole of the outer sleeve is the surgical channel; since the core rod, the inner sleeve, the driving sleeve and the outer sleeve are connected together, the inner sleeve, the driving sleeve and the outer sleeve do not need to be taken separately during the distraction operation; after the distraction operation is completed, the driving sleeve drives the inner sleeve and the core rod to be pulled out, and the inner sleeve and the core rod do not need to be moved out separately, so the operation steps of the distraction device of the present application are simple, the operation time can be saved, and the structure is simple. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A three-dimensional structure schematic diagram of the distraction device of the present embodiment is shown.

[0020] Figure 2 A structure schematic diagram of the distraction device of the present embodiment when inserted into the guide through hole of the guide is shown.

[0021] Figure 3A structural schematic diagram of the core rod of the distraction device of the present embodiment is shown.

[0022] Figure 4 A structural schematic diagram of the core rod of the distraction device of the present embodiment is shown.

[0023] Figure 5 A structural schematic diagram of the inner sleeve of the distraction device of the present embodiment is shown.

[0024] Figure 6 A structural schematic diagram of the inner sleeve of the distraction device of the present embodiment is shown.

[0025] Figure 7 A structural schematic diagram of the driving sleeve of the distraction device of the present embodiment is shown.

[0026] Figure 8 A structural schematic diagram of the driving sleeve of the distraction device of the present embodiment is shown.

[0027] Figure 9 A structural schematic diagram of the driving sleeve of the distraction device of the present embodiment is shown. Figure 8 A structural schematic diagram of the driving sleeve of the distraction device of the present embodiment is shown.

[0028] Figure 10 A structural schematic diagram of the outer sleeve of the distraction device of the present embodiment is shown.

[0029] Figure 11 A structural schematic diagram of the outer sleeve of the distraction device of the present embodiment is shown.

[0030] Figure 12 A structural schematic diagram of the distraction device of the present embodiment is shown.

[0031] Figure 13 A structural schematic diagram of the distraction device of the present embodiment is shown.

[0032] Figure 14 A structural schematic diagram of the distraction device of the present embodiment is shown.

[0033] Figure 15 A structural schematic diagram of the distraction device of the present embodiment is shown.

[0034] Figure 16 A structural schematic diagram of the distraction device of the present embodiment is shown.

[0035] Figure 17Fig. 4 shows a schematic view of the structure of the inner sleeve and the core rod after the driving sleeve of the distraction device of the present embodiment is pulled out.

[0036] BRIEF DESCRIPTION OF DRAWINGS

[0037] 1 skin surface

[0038] 2 bone surface

[0039] 100 core rod

[0040] 110 shaft outer thread

[0041] 120 shaft knob

[0042] 200 inner sleeve

[0043] 210 inner sleeve protrusion

[0044] 220 inner sleeve outer thread

[0045] 230 positioning protrusion

[0046] 240 inner sleeve knob

[0047] 300 driving sleeve

[0048] 310 driving sleeve rotating member

[0049] 311 rotating knob

[0050] 320 driving sleeve protrusion

[0051] 330 boss

[0052] 400 outer sleeve

[0053] 410 outer edge

[0054] 420 receiving hole

[0055] 430 outer sleeve outer thread

[0056] 500 guide

[0057] 510 guide through hole

[0058] 520 main half ring body

[0059] 600 mechanical arm DETAILED DESCRIPTION

[0060] The present application will be described in detail by specific embodiments, and other advantages and effects of the present application can be easily understood by those skilled in the art from the contents disclosed in the present specification.

[0061] Please refer to the drawings. It should be understood that the structure, proportion, size and the like shown in the drawings attached to the present specification are only used to cooperate with the content disclosed in the specification, to enable those skilled in the art to understand and read, and are not used to limit the conditions that the present application can be implemented, so they do not have technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that the present application can produce, should still fall within the scope of the technology disclosed by the present application.

[0062] As shown in Figures 1 to 17 , the distraction device of the present embodiment comprises:

[0063] a core rod 100;

[0064] an inner sleeve 200 sleeved on the core rod 100, the inner side surface of the inner sleeve 200 being connected with the outer side surface of the core rod 100 through a screw pair;

[0065] a driving sleeve 300 sleeved on the inner sleeve 200, the inner side surface of the driving sleeve 300 being connected with the outer side surface of the inner sleeve 200 through a screw pair, and the outer side surface of the driving sleeve 300 being provided with a driving cylinder rotating piece 310;

[0066] an outer sleeve 400 sleeved on the driving sleeve 300, the outer side surface of the outer sleeve 400 being provided with an outer edge part 410, and the outer edge part 410 being detachably connected with the driving cylinder rotating piece 310.

[0067] When the distraction device of the present application is used, first, the distraction device is moved to the surgical site where the distraction operation is needed; then, the inner sleeve 200 is held, the core rod 100 is rotated, so that the core rod 100 moves downward into the skin and then stops at the bone surface 2; then, the core rod 100 is held, the inner sleeve 200 is rotated, so that the inner sleeve 200 moves downward into the skin and then stops at the bone surface 2; then, the inner sleeve 200 is held, the driving sleeve 300 is rotated, the driving sleeve 300 drives the outer sleeve 400 to move downward into the skin, and then the driving sleeve 300 stops at the preset position; finally, the outer sleeve 400 is pressed, the outer sleeve 400 is detached from the driving sleeve 300, the driving sleeve 300 drives the inner sleeve 200 and the core rod 100 to be pulled out; the inner hole of the outer sleeve 400 is the surgical channel.

[0068] Since the core rod 100, the inner sleeve 200, the driving sleeve 300 and the outer sleeve 400 are connected together, during the distraction operation, the inner sleeve 200, the driving sleeve 300 and the outer sleeve 400 do not need to be taken separately; after the distraction operation is completed, the driving sleeve 300 drives the inner sleeve 200 and the core rod 100 to be pulled out, and the inner sleeve 200 and the core rod 100 do not need to be moved out separately, so that the operation steps of the distraction device are simple, the operation time can be saved, and the structure is simple.

[0069] The outer side of the core rod 100 is provided with a rod body outer thread 110, the inner side of the inner sleeve 200 is provided with an inner sleeve protrusion 210 matched with the rod body outer thread 110, and the inner sleeve protrusion 210 and the rod body outer thread 110 form a screw pair connection. When the inner sleeve protrusion 210 is connected with the rod body outer thread 110, the inner sleeve 200 can rotate and then move up or down relative to the core rod 100, and the structure is simple. The angle of the helix angle of the rod body outer thread 110 is the same as the angle of the helix angle of the inner sleeve protrusion 210. Compared with the inner sleeve inner thread structure corresponding to the rod body outer thread 110 arranged on the inner side of the inner sleeve 200, the inner sleeve protrusion 210 arranged in the embodiment can make medical staff more conveniently drive the relative rotation between the core rod 100 and the inner sleeve 200. The rod body outer thread 110 is arranged at the lower end of the core rod 100, and the length of the rod body outer thread 110 is less than the length of the core rod 100. The lower end of the core rod 100 is a circular truncated cone structure with the cross-sectional dimension decreasing from top to bottom, so that the core rod 100 can be inserted below the skin surface 1.

[0070] The outer side of the inner sleeve 200 is provided with an inner sleeve outer thread 220, the inner side of the driving sleeve 300 is provided with a driving sleeve protrusion 320 matched with the inner sleeve outer thread 220, and the driving sleeve protrusion 320 and the inner sleeve outer thread 220 form a screw pair connection. When the driving sleeve protrusion 320 is connected with the inner sleeve outer thread 220, the driving sleeve 300 can rotate and then move up or down relative to the inner sleeve 200, and the structure is simple. The angle of the helix angle of the inner sleeve outer thread 220 is the same as the angle of the helix angle of the driving sleeve protrusion 320. Compared with the driving sleeve inner thread structure corresponding to the inner sleeve outer thread 220 arranged on the inner side of the driving sleeve 300, the driving sleeve protrusion 320 arranged in the embodiment can make medical staff more conveniently drive the relative rotation between the inner sleeve 200 and the driving sleeve 300. The length of the inner sleeve outer thread 220 is the same as the length of the inner sleeve 200.

[0071] The boss 330 on the bottom surface of the driving cylinder rotating piece 310 is clamped into the receiving hole 420 on the outer edge part 410. This structure facilitates the connection and disassembly of the driving cylinder rotating piece 310 and the outer edge part 410. The driving cylinder rotating piece 310 includes two oppositely arranged knob parts 311, which are connected to the outer side surface of the driving sleeve 300. The driving cylinder rotating piece 310 is fixed on the outer side surface of the driving sleeve 300 by welding or threaded connection. The outer sleeve 400 is connected to the driving sleeve 300, and moves with the driving sleeve 300 when the driving sleeve 300 moves. Each knob part 311 is provided with a boss 330; the outer side surface of the outer sleeve 400 is provided with two outer edge parts 410, and each outer edge part 410 is provided with a receiving hole 420; the receiving hole 420 corresponds to the boss 330 one by one, so that the connection between the driving cylinder rotating piece 310 and the outer edge part 410 is more stable.

[0072] The outer side surface of the lower part of the inner sleeve 200 is provided with a positioning convex part 230. The positioning convex part 230 functions as a limiting part. When the lower end of the driving sleeve 300 contacts the positioning convex part 230, the driving sleeve 300 stops, i.e., reaches the preset position. The positioning convex part 230 is a circular truncated cone structure with the cross-sectional dimension decreasing from top to bottom. The circular truncated cone structure can limit the downward movement of the driving sleeve 300 and facilitate the extension of the inner sleeve 200 below the skin surface 1.

[0073] The outer side surface of the core rod 100 is circumferentially provided with a rod knob 120, i.e., the rod knob 120 is sleeved on the outer side surface of the core rod 100. The rod knob 120 is fixed on the upper end of the core rod 100 by welding or threaded connection, which facilitates the rotation of the core rod 100 by medical staff.

[0074] The outer side surface of the inner sleeve 200 is circumferentially provided with an inner sleeve knob 240, i.e., the inner sleeve knob 240 is sleeved on the outer side surface of the inner sleeve 200. The inner sleeve knob 240 is fixed on the upper end of the inner sleeve 200 by welding or threaded connection, which facilitates the rotation of the inner sleeve 200 by medical staff.

[0075] The outer side surface of the outer sleeve 400 is provided with an outer sleeve external thread 430. The outer sleeve external thread 430 is arranged to fix the outer sleeve 400 on the skin after the outer sleeve 400 is rotated into the skin, so that the outer sleeve 400 will not come out.

[0076] The inner sleeve 200 of the distraction device can be placed in the guide through hole 510 of the guide 500 connected to the mechanical arm 600 of the surgical robot. The guide 500 realizes the guiding effect, so that the distraction device can be accurately placed at the position where the distraction operation needs to be performed. The guide 500 includes two detachably connected main half ring bodies 520, which enclose the guide through hole 510 when closed, and form an opening when opened, through which the inner sleeve 200 can be placed.

[0077] The method for using the distraction device of the embodiment includes the following steps:

[0078] 1) Open the main half ring body 520 of the guide 500, and place the inner sleeve 200 of the distraction device into the guide 500, and then close the main half ring body 520 of the guide 500; the outer diameter of the inner sleeve 200 of the distraction device and the guide through hole 510 of the guide 500 are clearance fit, that is, the outer diameter of the distraction device is slightly smaller than the diameter of the guide through hole 510 of the guide 500, and with the navigation of the mechanical arm 600 of the surgical robot, the distraction device can be accurately placed at the surgical site where the distraction operation needs to be performed;

[0079] 2) Hold the inner sleeve 200 and rotate the core rod 100, so that the core rod 100 moves downward into the skin and stops at the bone surface 2;

[0080] 3) Hold the core rod 100 and rotate the inner sleeve 200, so that the inner sleeve 200 moves downward into the skin and stops at the bone surface 2;

[0081] 4) Hold the inner sleeve 200 and rotate the drive sleeve 300, so that the drive sleeve 300 drives the outer sleeve 400 to move downward into the skin, and stops when the lower end of the drive sleeve 300 contacts the positioning protrusion 230;

[0082] 5) While holding the outer sleeve 400, disassemble the outer sleeve 400 from the drive sleeve 300, and drive the drive sleeve 300 to pull out the inner sleeve 200 and the core rod 100; only the outer sleeve 400 is left on the skin, and the outer edge part 410 of the outer sleeve 400 is pressed to approach the bone surface through the outer edge part 410 of the outer sleeve 400, at this time, the inner hole of the outer sleeve 400 is the surgical channel, and the outer edge part 410 of the outer sleeve 400 is on the skin surface 1, and the guide through hole 510 of the guide 500 outside the skin is the external surgical channel. With the external surgical channel and the surgical channel formed by the inner hole of the outer sleeve 400, subsequent surgical steps such as screw implantation can be completed.

[0083] The controller of the surgical robot is connected with the mechanical arm 600. After the controller calculates and positions the installation position of the pedicle screw, the skin tissue below the skin incision and directly to the bone surface needs to be stripped and cleaned before the pedicle screw is installed, and then the distraction device is placed, that is, a surgical channel is formed. With the assistance of the guide 500 at the end of the mechanical arm 600, the device can accurately place the distraction sleeve, and the operation is very convenient.

[0084] The above embodiments only illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical idea disclosed by the present application should be covered by the claims of the present application.

Claims

1. A distraction device, comprising: The utility model relates to a kind of dilating devices, including: Core rod (100); Inner sleeve (200), sleeve is set on the core rod (100), the inner side of the inner sleeve (200) is connected with the outer side of the core rod (100) by screw pair; Driving sleeve (300), sleeve is set on the inner sleeve (200), the inner side of the driving sleeve (300) is connected with the outer side of the inner sleeve (200) by screw pair, driving sleeve (300) is equipped with driving cylinder rotating piece (310) on the outer side thereof; Outer sleeve (400), sleeve is set on the driving sleeve (300), outer sleeve (400) is equipped with outer edge portion (410) on the outer side thereof, and the outer edge portion (410) is detachably connected with the driving cylinder rotating piece (310);When the inner sleeve (200) is removed, the outer sleeve (400) is detached from the driving sleeve (300) by pressing the outer sleeve (400), and the driving sleeve (300) drives the inner sleeve (200) and the core rod (100) to be pulled out.

2. The distraction device of claim 1, wherein: The outer side of the core rod (100) is equipped with rod body outer thread (110), the inner side of the inner sleeve (200) is equipped with inner sleeve bump (210) matched with the rod body outer thread (110), and the inner sleeve bump (210) and the rod body outer thread (110) form screw pair connection.

3. The distractor of claim 1, wherein: The outer side of the inner sleeve (200) is equipped with inner sleeve outer thread (220), the inner side of the driving sleeve (300) is equipped with driving cylinder bump (320) matched with the inner sleeve outer thread (220), and the driving cylinder bump (320) and the inner sleeve outer thread (220) form screw pair connection.

4. The distractor of claim 1, wherein: The boss (330) on the bottom surface of the driving cylinder rotating piece (310) is equipped with the receiving hole (420) for the boss (330) to be clamped into on the outer edge portion (410).

5. The distractor of claim 1, wherein: The outer side of the lower part of the inner sleeve (200) is equipped with positioning convex part (230).

6. The distractor of claim 1, wherein: The core rod (100) is equipped with rod body knob (120).

7. The distractor of claim 1, wherein: The inner sleeve (200) is equipped with inner sleeve knob (240).

8. The distractor of claim 1, wherein: The outer side of the outer sleeve (400) is equipped with outer sleeve outer thread (430).

9. The distractor of claim 1, wherein: The inner sleeve (200) of the dilating device can be placed in the guide through hole (510) of the guide (500), and the guide (500) is connected with the mechanical arm (600) of surgical robot.

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