A retractor for minimally invasive thyroid surgery

Abstract

The present invention relates to the technical field of thyroid minimally invasive surgery instruments, and discloses a retractor for thyroid minimally invasive surgery, which comprises a handle, on which a rotating shaft rod is provided, one end of the rotating shaft rod is rotatably arranged on the handle, and the other end of the rotating shaft rod is provided with a retractor for thyroid minimally invasive surgery; an operating swing rod, one end of which is rotatably arranged on the handle, and the other end of the operating swing rod extends out of the handle, and the operating swing rod rotates to have a first position biased toward one side of the handle, a second position biased toward the other side of the handle, and an intermediate position between the first position and the second position; and a transmission device for transmission connection between the operating swing rod and the rotating shaft rod. The retractor can rotate quantitatively, which is convenient for medical staff to control the rotation angle of the retractor.

Description

Technical Field

[0001] The invention relates to the technical field of minimally invasive thyroid surgery instruments, and in particular to a retractor for minimally invasive thyroid surgery. Background Art

[0002] As patients have higher requirements for neck surgical scars and long-term aesthetics, laparoscopic thyroid surgery has gradually replaced some open surgeries, is increasingly widely used in clinical practice, and has gradually become an important method for surgery of benign thyroid tumors and low-grade malignant thyroid tumors.

[0003] At present, in order to provide surgical operation space and field of view, most laparoscopic thyroid surgeries require the use of thyroid retractors with U-shaped tips. In order to fully retract the anterior cervical muscles and fully expose the surgical field during the operation, the position of the thyroid retractor needs to be adjusted and rotated. The rotation of the existing thyroid retractor is generally done by holding the retractor handle, and the rotation angle is difficult to accurately control, which can easily lead to difficulty in accurately positioning the retractor and the retractor tip can easily damage the organs and tissues around the thyroid gland. The operating burden of medical staff is heavy, and patients are also at risk of accidental injury. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a retractor for minimally invasive thyroid surgery, which can be rotated quantitatively, making it convenient for medical staff to control the rotation angle of the retractor.

[0005] To achieve the above-mentioned purpose, the retractor for minimally invasive thyroid surgery of the present invention comprises:

[0006] A handle, on which a rotating shaft is provided, one end of which is rotatably arranged on the handle, and the other end of which is provided with a retractor for minimally invasive thyroid surgery;

[0007] An operating swing rod, one end of which is rotatably disposed on the handle, the other end of the operating swing rod extends out of the handle, and the operating swing rod rotates to have a first position biased toward one side of the handle, a second position biased toward the other side of the handle, and an intermediate position between the first position and the second position; and

[0008] A transmission device for connecting the operating swing rod and the rotating shaft rod;

[0009] The operating rocker arm reciprocates between the first position and the middle position, and can cause the shaft rod to rotate in a positive stepping direction through the transmission device; the operating rocker arm reciprocates between the second position and the middle position, and can cause the shaft rod to rotate in a reverse stepping direction through the transmission device.

[0010] In one embodiment, the transmission device comprises a ratchet disc, a guide baffle, a first pawl, a second pawl, an elastic support member and a non-return mechanism, wherein the ratchet disc is rotatably arranged on the handle, the rotation axis of the ratchet disc is arranged parallel to the rotation axis of the operating swing rod, and the ratchet disc is transmission-connected with the rotating shaft rod; the guide baffle is an arc-shaped structure, the guide baffle is fixed outside the ratchet disc, and extends along the circumference of the ratchet disc;

[0011] One end of the first pawl and one end of the second pawl are rotatably arranged on the operating swing rod, respectively, the other end of the first pawl and the other end of the second pawl extend to both sides of the operating swing rod and extend to the ratchet disc, respectively, the elastic support member is arranged on the operating swing rod, and provides elastic force to make the first pawl and the second pawl stick to the ratchet disc respectively;

[0012] When the operating swing rod is in the middle position, the operating swing rod is directly opposite to the middle of the guide partition plate, and the guide partition plate is in the area surrounded by the first pawl, the second pawl and the ratchet disc;

[0013] The non-return mechanism can prevent the ratchet disc from rotating when the operating rocker arm rotates from the first position or the second position to the intermediate position.

[0014] In one of the embodiments, an anti-rotation portion is provided on the ratchet disk, and the anti-rotation portion is arranged in a one-to-one correspondence with the ratchet teeth of the ratchet disk, and the non-return mechanism includes an anti-rotation block, a first elastic member, a pressure rod and a second elastic member; the anti-rotation block is slidably arranged on the handle corresponding to the intermediate position, the first elastic member elastically connects the anti-rotation block and the handle, and provides an elastic force to make the anti-rotation block approach the corresponding anti-rotation portion of the ratchet disk, so that the corresponding anti-rotation portion cooperates with the anti-rotation block to lock the ratchet disk; the pressure rod is slidably arranged on the operating rocker arm, and can slide along the axial direction of the operating rocker arm; the second elastic member elastically connects the pressure rod and the operating rocker arm, and provides an elastic force to make one end of the pressure rod extend out of the end of the operating rocker arm extending out of the handle; the operating rocker arm is in the intermediate position so that the other end of the pressure rod is directed toward the anti-rotation block, and the pressure rod overcomes the elastic force of the second elastic member and slides toward the anti-rotation block, so as to push the anti-rotation block away from the anti-rotation portion and unlock the ratchet disk.

[0015] In one embodiment, the rotation axis of the operating rocker arm, the rotation axis of the rotating shaft rod and the rotation axis of the ratchet disk are arranged colinearly, the sliding direction of the anti-rotation block is arranged along the axial direction when the operating rocker arm is in the middle position, and the direction of the elastic force of the first elastic member on the anti-rotation block is toward the end of the handle extending out of the operating rocker arm.

[0016] In one of the embodiments, the operating rocker arm and the ratchet plate are respectively rotatably mounted on the rotating shaft rod, and the ratchet plate is arranged on the side of the operating rocker arm away from the hook; a strip hole is provided in the middle of the pressure rod, and the strip hole extends along the axial direction of the pressure rod, and the pressure rod is mounted outside the rotating shaft rod through the strip hole.

[0017] It is characterized in that two groups of third elastic members are also provided on the handle, and the third elastic members are respectively arranged on both sides of the operating rocker arm, one end of the third elastic member is connected to the handle, and the other end of the third elastic member is connected to the operating rocker arm, and provides elastic pulling force to keep the operating rocker arm in the middle position.

[0018] In one embodiment, the anti-rotation portion is a ratchet tooth gap of the ratchet disc, and the top of the anti-rotation block is arranged to match the ratchet tooth gap of the ratchet disc.

[0019] In one embodiment, the ratchet disc is transmission-connected to the rotating shaft through a reduction gear set.

[0020] In one embodiment, the ratchet teeth of the ratchet disc are rectangular ratchet teeth.

[0021] In one embodiment, the elastic support member is provided with a mounting portion, and the mounting portion is rotatably arranged on the operating rocker arm, the rotation axis of the mounting portion is parallel to the rotation axis of the first pawl and the second pawl, and elastic portions are respectively provided on both sides of the mounting portion, one end of the elastic portion is fixedly connected to the mounting portion, and the other end of one end of the elastic portion is respectively connected to a side of the first pawl away from the ratchet disk and a side of the second pawl away from the ratchet disk, and the elastic portion provides elastic pressure to make the first pawl and the second pawl close to the ratchet disk.

[0022] The retractor for minimally invasive thyroid surgery in the above embodiment has at least the following advantages:

[0023] (1) The operating swing rod rotates back and forth toward one side of the handle. Each reciprocating motion cycle can cause the shaft rod to drive the retractor to rotate a certain angle, thereby achieving quantitative rotation of the retractor, which is convenient for medical staff to control the accuracy of the retractor's rotation angle. The swing of the operating swing rod can directly control the shaft rod to drive the retractor to rotate forward and reverse, and can be operated with one hand, which is highly convenient to use. The reduction gear set can reduce the angle of each rotation of the shaft rod, thereby improving the precision of the retractor's rotation angle.

[0024] (2) When the operating rocker arm rotates, the guide baffle automatically guides the first pawl or the second pawl according to the rotation direction of the operating rocker arm, so that it disengages from the ratchet disk or approaches the ratchet disk, thereby realizing that the single operating rocker arm pushes the ratchet disk through the first pawl and the second pawl to realize forward and reverse rotation.

[0025] (3) The pressure rod pushes the anti-rotation block away from the anti-rotation part to unlock the ratchet disk, so that the operating rocker arm can push the ratchet disk to rotate through the first pawl or the second pawl; after each rotation of the ratchet disk, the first elastic member pushes the anti-rotation block closer to the corresponding anti-rotation part to lock the ratchet disk, and then the external force of the pressure rod is removed, so that the second elastic member resets the pressure rod, which facilitates the rotation of the operating rocker arm, and the third elastic member drives the operating rocker arm to automatically return to the middle position.

[0026] (4) When the first pawl or the second pawl slides onto the guide baffle, the elastic support member can rotate through the elastic portion on the corresponding side, and increase the pressure of the other elastic portion on the corresponding second pawl or the first pawl to prevent the second pawl or the first pawl from slipping off the ratchet disk. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation of the present invention, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0028] Figure 1 A front cross-sectional view of a retractor for minimally invasive thyroid surgery provided by an embodiment of the present invention;

[0029] Figure 2 for Figure 1 The CC view shown;

[0030] Figure 3 for Figure 1 BB view shown;

[0031] Figure 4 for Figure 2 Schematic diagram of the position of the operating swing rod rotation shown;

[0032] Reference numerals:

[0033] 1-handle, 2-rotating shaft, 21-draw hook, 3-operating swing lever, 41-first position, 42-second position, 43-middle position;

[0034] 5-transmission device, 51-ratchet disc, 511-ratchet, 512-anti-rotation part, 52-dividing guide partition, 53-first pawl, 54-second pawl, 55-elastic support member, 551-installation part, 552-elastic part, 56-non-return mechanism, 561-anti-rotation block, 562-first elastic member, 563-pressure rod, 5631-strip hole, 564-second elastic member;

[0035] 6-the third elastic member, 7-the reduction gear set. DETAILED DESCRIPTION

[0036] The embodiments of the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and the protection scope of the present invention cannot be limited thereto. It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should be the common meanings understood by those skilled in the art to which the present invention belongs.

[0037] In the description of this application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0038] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] See also Figures 1 to 4 In one embodiment, the retractor for minimally invasive thyroid surgery includes a handle 1, a rotating shaft 2, a retractor 21, an operating swing rod 3 and a transmission device 5, wherein the retractor 21 can rotate quantitatively, so that medical staff can control the rotation angle of the retractor 21.

[0040] For details, please refer to Figures 1 to 3 , a rotating shaft rod 2 is provided on the handle 1. One end of the rotating shaft rod 2 is rotatably arranged on the handle 1, and the other end of the rotating shaft rod 2 is provided with a retractor 21 for minimally invasive thyroid surgery. The handle 1 is used for holding, installing and supporting other components during operation. One end of the rotating shaft rod 2 is rotatably arranged in the handle 1, and the other end extends out of the handle 1. The retractor 21 is arranged on the end of the rotating shaft rod 2 extending out of the handle 1. Specifically, the retractor 21 adopts a structure with a U-shaped pointed head. In one embodiment, the retractor 21 is detachably arranged on the rotating shaft rod 2 to facilitate the replacement of non-standard retractors.

[0041] In one embodiment, the hook 21 is an openable and closable hook. The hook 21 includes a rod body and a hook arm, one end of the rod body is connected to the shaft rod 2, and the other end of the rod body is provided with a hook arm, one end of the hook arm is rotatably arranged on the rod body, and the hook arm can be rotated to be close to the rod body or to form an acute angle with the end of the rod body close to the shaft rod 2 to form a hook. When the hook arm rotates to be close to the rod body, the hook 21 is closed to facilitate puncture into the surgical cavity. After the hook 21 enters the surgical cavity, it can be opened to work normally. It can be understood that the hook arm can be opened by provoking other instruments. Specifically, a damping is set at the connection between the hook arm and the rod body, so that the hook arm and the rod body can rely on the damping to maintain a close state or form a hook state. The damping can be achieved by the friction force of the interference fit or other structures. In one embodiment, the hook arm is in two groups and is symmetrically arranged on both sides of the rod body. So that it is easy to select one side to form a hook or both sides to form a hook at the same time.

[0042] Please also read Figure 4, one end of the operating pendulum rod 3 is rotatably arranged on the handle 1. The other end of the operating pendulum rod 3 extends out of the handle 1. The operating pendulum rod 3 rotates to have a first position 41 biased toward one side of the handle 1, a second position 42 biased toward the other side of the handle 1, and an intermediate position 43 between the first position 41 and the second position 42. The transmission device 5 is connected to the operating pendulum rod 3 and the shaft rod 2. The operating pendulum rod 3 reciprocates between the first position 41 and the intermediate position 43, and can make the shaft rod 2 rotate in a positive step through the transmission device 5. The operating pendulum rod 3 reciprocates between the second position 42 and the intermediate position 43, and can make the shaft rod 2 rotate in a reverse step through the transmission device 5. The check mechanism 56 can prevent the ratchet disc 51 from rotating during the operation of the operating pendulum rod 3 rotating from the first position 41 or the second position 42 to the intermediate position 43. The operating swing rod 3 reciprocates toward one side of the handle 1, and each reciprocating motion cycle can make the shaft rod 2 drive the hook 21 to rotate a certain angle, so as to realize the quantitative rotation of the hook 21, and facilitate the medical staff to control the accuracy of the rotation angle of the hook 21. The swing of the operating swing rod 3 can directly control the shaft rod 2 to drive the hook 21 to rotate forward and reverse, and can realize one-hand operation, which is highly convenient to use. Specifically, the transmission device 5 includes a ratchet disc 51, a guide partition 52, a first pawl 53, a second pawl 54, an elastic support member 55 and a non-return mechanism 56. The ratchet disc 51 is rotatably arranged on the handle 1, and the rotation axis of the ratchet disc 51 is arranged parallel to the rotation axis of the operating swing rod 3. The ratchet disc 51 is connected to the shaft rod 2 in transmission. The guide partition 52 is an arc structure, and the guide partition 52 is fixed outside the ratchet disc 51 and extends along the circumference of the ratchet disc 51. The guide partition plate 52 is fixed on the handle 1 and is arranged near the top of the ratchet teeth 511 of the ratchet disk 51. One end of the first pawl 53 and one end of the second pawl 54 are rotatably arranged on the operating swing rod 3. The other end of the first pawl 53 and the other end of the second pawl 54 extend to both sides of the operating swing rod 3 and extend to the ratchet disk 51. The elastic support member 55 is arranged on the operating swing rod 3 and provides elastic force to make the first pawl 53 and the second pawl 54 respectively close to the ratchet disk 51. When the operating swing rod 3 is in the middle position 43, the operating swing rod 3 is opposite to the middle of the guide partition plate 52, and the guide partition plate 52 is in the area surrounded by the first pawl 53, the second pawl 54 and the ratchet disk 51. Specifically, the first pawl 53 and the second pawl 54 extend to the ratchet disk 51 in opposite directions of the circumference of the ratchet disk 51. In one embodiment, the first pawl 53 and the second pawl 54 are provided with a rotating shaft arranged on the operating swing rod 3. The operating swing rod 3 is usually in the middle position 43. When the hook 21 needs to be rotated, the operating swing rod 3 is rotated to the first position 41 or the second position 42. Figure 4When the operating swing rod 3 rotates from the middle position 43 to the first position 41, the first pawl 53 pushes the ratchet disc 51 to rotate counterclockwise, and at the same time, the operating swing rod 3 drives the second pawl 54 to slide onto the guide partition 52. When the operating swing rod 3 rotates from the first position 41 to the middle position 43, the first pawl 53 is in the return state, the ratchet disc 51 does not rotate, and the operating swing rod 3 pushes the second pawl 54 to slide along the guide partition 52, and then falls back onto the ratchet disc 51 under the action of the elastic support member 55. When the operating swing rod 3 moves between the middle position 43 and the second position 42, the first pawl 53 and the second pawl 54 move similarly. Therefore, when the operating rocker arm 3 rotates, the guide baffle 52 automatically guides the first pawl 53 or the second pawl 54 according to the rotation direction of the operating rocker arm 3, so that it disengages from the ratchet disk 51 or approaches the ratchet disk 51, thereby realizing that the single operating rocker arm 3 pushes the ratchet disk 51 through the first pawl 53 and the second pawl 54 to realize forward and reverse rotation.

[0043] Please refer again Figures 1 to 3 In one embodiment, the ratchet disc 51 is connected to the rotating shaft rod 2 through a reduction gear set 7. The reduction gear set 7 makes the rotation speed of the rotating shaft rod 2 lower than the rotation speed of the ratchet disc 51. Thereby reducing the angle of rotation of the rotating shaft rod 2 each time the operating swing rod 3 moves, and improving the precision of the rotation angle of the hook 21. In one embodiment, the ratchet teeth 511 of the ratchet disc 51 are rectangular ratchet teeth 511. Thereby, the first pawl 53 and the second pawl 54 are respectively matched on both sides of the ratchet teeth 511 to facilitate the forward and reverse rotation of the ratchet disc 51. In one embodiment, the elastic support member 55 is provided with a mounting portion 551. The mounting portion 551 is rotatably arranged on the operating swing rod 3, and the rotation axis of the mounting portion 551 is parallel to the rotation axis of the first pawl 53 and the second pawl 54. Elastic parts 552 are respectively provided on both sides of the mounting part 551, one end of the elastic part 552 is fixedly connected to the mounting part 551, and the other end of one end of the elastic part 552 is respectively connected to the side of the first pawl 53 away from the ratchet disc 51 and the side of the second pawl 54 away from the ratchet disc 51, and the elastic part 552 provides elastic pressure to make the first pawl 53 and the second pawl 54 close to the ratchet disc 51. In one embodiment, the elastic part 552 is an elastic sheet, and the two elastic sheets are arranged in a "human" shape and pressed tightly on the first pawl 53 and the second pawl 54. The elastic sheet can be made of elastic-plastic materials such as steel or plastic. It is understandable that the elastic part 552 can also be an elastic block structure made of a compression spring or elastic material. When the first pawl 53 or the second pawl 54 slides onto the dividing partition 52, the elastic support member 55 can rotate through the elastic portion 552 on the corresponding side, and increase the pressure of the other elastic portion 552 on the corresponding second pawl 54 or the first pawl 53 to prevent the second pawl 54 or the first pawl 53 from slipping off the ratchet disk 51.

[0044] In one embodiment, an anti-rotation portion 512 is provided on the ratchet disc 51. The anti-rotation portion 512 is arranged one-to-one corresponding to the ratchet teeth 511 of the ratchet disc 51. The non-return mechanism 56 includes an anti-rotation block 561, a first elastic member 562, a pressure rod 563 and a second elastic member 564. The anti-rotation block 561 is slidably arranged on the handle 1 corresponding to the middle position 43, and the first elastic member 562 elastically connects the anti-rotation block 561 and the handle 1, and provides elastic force to make the anti-rotation block 561 close to the corresponding anti-rotation portion 512 of the ratchet disc 51, so that the corresponding anti-rotation portion 512 cooperates with the anti-rotation block 561 to lock the ratchet disc 51. Specifically, the anti-rotation portion 512 is evenly spaced along the circumference of the ratchet disc 51 corresponding to the ratchet teeth 511. The anti-rotation portion 512 and the anti-rotation block 561 are connected in a plug-in manner to prevent the ratchet disc 51 from rotating and locking the ratchet disc 51. The anti-rotation portion 512 and the anti-rotation block 561 can adopt structures such as matching holes and latches, matching grooves and blocks. In one embodiment, the anti-rotation portion 512 is a gap between the ratchet teeth 511 of the ratchet disk 51, and the top of the anti-rotation block 561 is arranged to match the gap between the ratchet teeth 511 of the ratchet disk 51. The pressure rod 563 is slidably arranged on the operating swing rod 3 and can slide along the axial direction of the operating swing rod 3. The second elastic member 564 elastically connects the pressure rod 563 and the operating swing rod 3, and provides elastic force to make one end of the pressure rod 563 extend out of the end of the operating swing rod 3 extending out of the handle 1. When the operating swing rod 3 is in the middle position 43, the other end of the pressure rod 563 can be directed toward the anti-rotation block 561, and the pressure rod 563 overcomes the elastic force of the second elasticity to slide toward the anti-rotation block 561, which can push the anti-rotation block 561 away from the anti-rotation portion 512 and unlock the ratchet disk 51. Specifically, when one end of the pressure rod 563 extending out of the operating swing rod 3 and the handle 1 is subjected to pressure, the pressure rod 563 overcomes the elastic force of the second elastic member 564, slides toward the anti-rotation block 561, and simultaneously overcomes the elastic force of the first elastic member 562 to make the anti-rotation block 561 away from the anti-rotation portion 512. In one embodiment, the rotation axis of the operating swing rod 3, the rotation axis of the shaft rod 2, and the rotation axis of the ratchet disc 51 are arranged in a colinear manner. The sliding direction of the anti-rotation block 561 is arranged along the axial direction when the operating swing rod 3 is in the middle position 43, and the direction of the elastic force of the first elastic member 562 on the anti-rotation block 561 is toward the end of the operating swing rod 3 extending out of the handle 1. In one embodiment, the operating swing rod 3 and the ratchet disc 51 are respectively rotatably sleeved on the shaft rod 2, and the ratchet disc 51 is arranged on the side of the operating swing rod 3 away from the hook 21. A strip hole 5631 is provided in the middle of the pressure rod 563, and the strip hole 5631 extends along the axial direction of the pressure rod 563. The pressure rod 563 is sleeved outside the rotating shaft rod 2 through the strip hole 5631. The ratchet disc 51 is arranged on the side of the operating swing rod 3 away from the hook 21, so that a rotating gear is installed in the end of the handle 1 away from the hook 21 to reduce the speed of the rotating shaft rod 2, so that the total length of the handle 1 is shorter and the space occupied during use is reduced. In one embodiment, two sets of third elastic members 6 are also provided on the handle 1. The third elastic members 6 are respectively arranged on both sides of the operating swing rod 3.One end of the third elastic member 6 is connected to the handle 1, and the other end of the third elastic member 6 is connected to the operating swing rod 3, and provides elastic tension to keep the operating swing rod 3 in the middle position 43. When the draw hook 21 needs to be rotated, the operator holds the handle 1, and presses the pressing rod 563 with the thumb or other fingers. The pressing rod 563 pushes the anti-rotation block 561 away from the anti-rotation part 512 to unlock the ratchet disc 51, so that the operating swing rod 3 can push the ratchet disc 51 to rotate through the first pawl 53 or the second pawl 54. After each rotation of the ratchet disc 51, the first elastic member 562 pushes the anti-rotation block 561 close to the corresponding anti-rotation part 512 to lock the ratchet disc 51. At this time, the operator's finger releases the pressing rod 563, removes the external force of the pressing rod 563, and causes the second elastic member 564 to reset the pressing rod 563, so that the pressing rod 563 can avoid the anti-rotation block 561 when rotating to the middle position 43 with the operating swing rod 3, which is convenient for the operating swing rod 3 to rotate. At the same time, the third elastic member 6 drives the operating swing rod 3 to automatically return to the middle position 43. The operation is simple and convenient, and is easy to operate with one hand. In one embodiment, the first elastic member 562 and the second elastic member 564 are compression springs. It can be understood that the first elastic member 562 and the second elastic member 564 can also be support blocks or other structures made of elastic materials. In one embodiment, the third elastic member 6 is a tension spring. It can be understood that the third elastic member 6 can also be a rubber band or other elastic tension structure.

[0045] According to the thyroid minimally invasive surgery retractor in the above technical solution, when in use, the operating swing rod 3 is reciprocated toward one side of the handle 1, and each reciprocating motion cycle can make the shaft rod 2 drive the retractor 21 to rotate a certain angle, so as to achieve quantitative rotation of the retractor 21, which is convenient for medical staff to control the accuracy of the rotation angle of the retractor 21. The swing of the operating swing rod 3 can directly control the shaft rod 2 to drive the retractor 21 to rotate forward and reverse, and can achieve one-handed operation, which is highly convenient to use. The reduction gear set 7 can reduce the angle of each rotation of the shaft rod 2, and improve the precision of the rotation angle of the retractor 21.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A retractor for minimally invasive thyroid surgery, characterized in that: include: A handle, on which a rotating shaft is provided, one end of which is rotatably arranged on the handle, and the other end of which is provided with a retractor for minimally invasive thyroid surgery; An operating swing rod, one end of which is rotatably disposed on the handle, the other end of the operating swing rod extends out of the handle, and the operating swing rod rotates to have a first position biased toward one side of the handle, a second position biased toward the other side of the handle, and an intermediate position between the first position and the second position; and A transmission device for connecting the operating swing rod and the rotating shaft rod; The operating swing rod reciprocates between the first position and the intermediate position, and can cause the shaft rod to rotate in a positive stepping direction through the transmission device; the operating swing rod reciprocates between the second position and the intermediate position, and can cause the shaft rod to rotate in a reverse stepping direction through the transmission device; The transmission device comprises a ratchet disc, a guide partition, a first pawl, a second pawl, an elastic support and a non-return mechanism, wherein the ratchet disc is rotatably arranged on the handle, the rotation axis of the ratchet disc is arranged parallel to the rotation axis of the operating swing rod, and the ratchet disc is connected to the rotating shaft rod in a transmission manner; the guide partition is an arc-shaped structure, and the guide partition is fixedly arranged outside the ratchet disc and extends along the circumference of the ratchet disc; One end of the first pawl and one end of the second pawl are rotatably arranged on the operating swing rod, respectively, the other end of the first pawl and the other end of the second pawl extend to both sides of the operating swing rod and extend to the ratchet disc, respectively, the elastic support member is arranged on the operating swing rod, and provides elastic force to make the first pawl and the second pawl stick to the ratchet disc respectively; When the operating swing rod is in the middle position, the operating swing rod is directly opposite to the middle of the guide partition plate, and the guide partition plate is in the area surrounded by the first pawl, the second pawl and the ratchet disc; The non-return mechanism can prevent the ratchet disc from rotating when the operating swing lever rotates from the first position or the second position to the intermediate position; The ratchet disc is provided with an anti-rotation portion, and the anti-rotation portion is arranged one-to-one with the ratchet teeth of the ratchet disc, and the non-return mechanism comprises an anti-rotation block, a first elastic member, a pressure rod and a second elastic member; the anti-rotation block is slidably arranged on the handle corresponding to the intermediate position, the first elastic member elastically connects the anti-rotation block and the handle, and provides an elastic force to make the anti-rotation block approach the corresponding anti-rotation portion of the ratchet disc, so that the corresponding anti-rotation portion cooperates with the anti-rotation block to lock the ratchet disc; the pressure rod is slidably arranged on the operating rocker arm and can slide axially along the operating rocker arm; the second elastic member elastically connects the pressure rod and the operating rocker arm, and provides an elastic force to make one end of the pressure rod extend out of the end of the operating rocker arm extending out of the handle; when the operating rocker arm is in the intermediate position, the other end of the pressure rod can be directed toward the anti-rotation block, and the pressure rod overcomes the elastic force of the second elasticity and slides toward the anti-rotation block, so as to push the anti-rotation block away from the anti-rotation portion and unlock the ratchet disc.

2. The retractor for minimally invasive thyroid surgery according to claim 1, characterized in that: The rotation axis of the operating rocker arm, the rotation axis of the rotating shaft rod and the rotation axis of the ratchet disk are arranged in a colinear manner, the sliding direction of the anti-rotation block is arranged along the axial direction when the operating rocker arm is in the middle position, and the direction of the elastic force of the first elastic member on the anti-rotation block is toward the end of the handle extending out of the operating rocker arm.

3. The retractor for minimally invasive thyroid surgery according to claim 2, characterized in that: The operating rocker arm and the ratchet disc are rotatably sleeved on the rotating shaft rod respectively, and the ratchet disc is arranged on the side of the operating rocker arm away from the hook; a strip hole is provided in the middle of the pressure rod, and the strip hole extends along the axial direction of the pressure rod, and the pressure rod is sleeved outside the rotating shaft rod through the strip hole.

4. The retractor for minimally invasive thyroid surgery according to any one of claims 1 to 3, characterized in that: The handle is also provided with two groups of third elastic members, which are respectively arranged on both sides of the operating rocker arm. One end of the third elastic member is connected to the handle, and the other end of the third elastic member is connected to the operating rocker arm, and provides elastic pulling force to keep the operating rocker arm in the middle position.

5. The retractor for minimally invasive thyroid surgery according to claim 1, characterized in that: The anti-rotation portion is a ratchet tooth gap of the ratchet disc, and the top of the anti-rotation block is arranged to match the ratchet tooth gap of the ratchet disc.

6. The retractor for minimally invasive thyroid surgery according to claim 1, characterized in that: The ratchet disc is transmission-connected to the rotating shaft through a reduction gear set.

7. The retractor for minimally invasive thyroid surgery according to claim 1, characterized in that: The ratchet teeth of the ratchet disc are rectangular ratchet teeth.

8. The retractor for minimally invasive thyroid surgery according to claim 1, characterized in that: The elastic support member is provided with a mounting portion, and the mounting portion is rotatably arranged on the operating rocker arm, the rotation axis of the mounting portion is parallel to the rotation axis of the first pawl and the second pawl, and elastic portions are respectively provided on both sides of the mounting portion, one end of the elastic portion is fixedly connected to the mounting portion, and the other end of one end of the elastic portion is respectively connected to a side of the first pawl away from the ratchet disk and a side of the second pawl away from the ratchet disk, and the elastic portion provides elastic pressure to make the first pawl and the second pawl close to the ratchet disk.

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