Medical retractor

Abstract

According to the technical scheme, the medical retractor is characterized in that the medical retractor comprises a supporting rod, and the supporting rod is arranged to be a vertical rod; the drag hook is used for pulling open a surgical incision; the first fixing part is arranged on the vertical rod; the first rotating part is rotationally connected to the first fixing part, and the rotating axis of the first rotating part is horizontal; the second fixing part is fixedly connected to the first rotating part; the second rotating part is rotationally connected to the second fixing part, and the rotating axis of the second rotating part is perpendicular to the rotating axis of the first rotating part; a moving rod; and a control mechanism. Locking and loosening of the first rotating part, the second rotating part and the moving rod are controlled at the same time through the control mechanism, so that an operator can control the drag hook to conduct multi-degree-of-freedom adjustment at the same time, and operation of the retraction device is more convenient and faster.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of medical apparatus and instruments, more particularly, it relates to a medical retractor. BACKGROUND

[0002] The surgical retractor is also called a tractor, which is a medical instrument that can pull soft tissues in a surgical incision or a surgical cavity to widen the surgical field and is widely used in general surgery.

[0003] The existing tractor needs to adjust the height, angle and the like of the tractor in order to achieve traction of different incision positions and incision angles when in use, but each degree of freedom needs to be adjusted separately when the existing tractor is adjusted, which makes the tractor need to go through a cumbersome adjustment process when in use and can only be used to pull the incision after adjustment, thereby causing the use of the tractor to be cumbersome and inconvenient. UTILITARY MODEL

[0004] In view of the deficiencies in the prior art, the utility model aims at providing a medical retractor, which can control the locking and loosening of the first rotating part, the second rotating part and the moving rod through the control mechanism, so that the operator can simultaneously control the retractor to adjust multiple degrees of freedom, and the operation of the retractor is more convenient and fast.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a medical retractor, comprising a supporting rod, the supporting rod is arranged as a vertical rod;

[0006] A retractor is arranged on the vertical rod for pulling open the surgical incision.

[0007] A first fixing part is arranged on the vertical rod.

[0008] A first rotating part is rotatably connected to the first fixing part, and the rotation axis of the first rotating part is horizontal.

[0009] A second fixing part is fixedly connected to the first rotating part.

[0010] A second rotating part is rotatably connected to the second fixing part, and the rotation axis of the second rotating part is perpendicular to the rotation axis of the first rotating part.

[0011] A moving rod is arranged on the second rotating part, the length direction of the moving rod is perpendicular to the rotation axis of the first rotating part and perpendicular to the rotation axis of the second rotating part, and the moving rod moves along the length direction on the second rotating part.

[0012] And a control mechanism for controlling the first rotating part, the second rotating part and the moving rod to be locked and released simultaneously.

[0013] The utility model further sets up: the control mechanism includes first control subassembly, first control subassembly sets up two and sets up respectively at the connecting place of first rotating part and first fixed part and the connecting place of second rotating part and second fixed part.

[0014] The utility model further sets up: first control subassembly includes rotating ring, rotating ring fixed connection is on first rotating part or second rotating part,

[0015] Fixed ring, the fixed ring fixed connection is on first fixed part or second fixed part, rotating ring and fixed ring coaxial arrangement, the axis of rotating ring setting on first rotating part and the rotating axis of first rotating part overlap, the axis of rotating ring setting on second rotating part and the rotating axis of second rotating part overlap,

[0016] Locking rod, the side of rotating ring close to fixed ring is provided with a plurality of locking holes around the axis of fixed ring, the locking rod is provided with a plurality of, a plurality of locking rods are arranged around the axis of fixed ring, the number of locking holes is greater than or equal to the number of locking rods, and a plurality of locking rods can be inserted into the locking hole simultaneously,

[0017] Elastic member, the elastic member is used for applying elastic force to the locking rod to push the locking rod to insert into the locking hole,

[0018] And the unlocking disc is arranged between the plurality of locking rods, the locking rod is provided with a clamping groove on the side close to the unlocking disc, and the unlocking disc is clamped into the clamping groove to enable the unlocking disc to drive the plurality of locking rods to move simultaneously.

[0019] The utility model further sets up: first control subassembly still includes the unlocking rod, the unlocking rod fixed connection is in the unlocking disc close to rotating ring one side and unlocking rod with rotating ring coaxial, the unlocking rod passes from rotating ring,

[0020] The control mechanism further includes a swing member rotatably connected at the connecting place of the first rotating part and the second fixed part.

[0021] The unlocking disc is fixedly connected with a conductive protrusion on the side away from the unlocking rod, one side of the swing member is in contact with the conductive protrusion in the second fixed part, and the other side is in contact with the unlocking rod away from the unlocking disc end in the first rotating part.

[0022] The utility model further sets up: still include fixed seat, the moving rod passes along fixed seat and can slide on fixed seat along the length direction of itself, the second rotating part is fixedly connected on fixed seat away from second fixed part one end,

[0023] The control mechanism further comprises a control rod, a length direction of the control rod is parallel to a length direction of the moving rod, the control rod passes through the fixed seat along a length direction of the control rod, the control rod is provided as a round rod, the control rod can slide along the length direction of the control rod on the fixed seat and can rotate around an axis of the control rod;

[0024] One side of the control rod is provided as a control plane, a distance between the control plane and an axis of the control rod is smaller than a radius of the control rod;

[0025] An end of the unlocking rod in the second rotating part close to the fixed seat extends into the fixed seat and contacts an outer side of the control rod, when the arc surface outside the control rod contacts the control rod in the second rotating part, the locking rods in the two first control assemblies are both separated from the locking holes, when the control plane outside the control rod contacts the control rod in the second rotating part, the locking rods in the two first control assemblies are both inserted into the locking holes.

[0026] The utility model further sets up: the moving rod is provided with a plurality of tooth slots along the length direction of the moving rod on one side close to the control rod;

[0027] The control mechanism further comprises a second control assembly, the second control assembly is arranged in the fixed seat and is located between the moving rod and the control rod.

[0028] The utility model further sets up: the second control assembly comprises a sliding rod, a length direction of the sliding rod is parallel to length directions of the moving rod and the control rod, the sliding rod can slide along the length direction of the sliding rod in the fixed seat;

[0029] The sliding rod is fixedly connected with a plurality of meshing teeth capable of meshing with the tooth slots on one end close to the moving rod;

[0030] And a resilient member, the resilient member is used for applying a resilient force to the sliding rod towards the control rod direction;

[0031] When the control plane outside the control rod contacts the control rod in the second rotating part, the arc surface outside the control rod contacts the sliding rod, at this time, the meshing teeth mesh with the tooth slots, when the arc surface outside the control rod contacts the control rod in the second rotating part, the control plane outside the control rod contacts the sliding rod, at this time, the meshing teeth are separated from the tooth slots.

[0032] The utility model further sets up: a long strip hole is arranged on the sliding rod and penetrates the sliding rod, a length direction of the long strip hole slides along the length direction of the sliding rod;

[0033] A fixed rod is arranged in the long strip hole and penetrates the long strip hole, the fixed rod is fixedly connected on the fixed seat, one end of the resilient member is connected with the fixed rod, and the other end is connected with the sliding rod.

[0034] The utility model further sets up: still include connecting seat, connecting seat is provided with two, two connecting seats are respectively arranged in mobile rod both ends, the both ends of control rod are rotatoryly connected on two connecting seats, the hook is arranged on one connecting seat.

[0035] The utility model further sets up: fixed connection has a pivot on the hook, the pivot rotatoryly connected on the connecting seat, the gear is located in the connecting seat outside the pivot;

[0036] Gear and control rod also are provided with second control assembly between.

[0037] Summarized above, the utility model discloses the following beneficial effects compared with prior art: the utility model discloses the locking and loosening of first rotating part, second rotating part and mobile rod are controlled simultaneously through control mechanism, so that operating personnel can control the hook to adjust multiple degrees of freedom simultaneously, so that the operation of the retractor is more convenient and fast. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 It is the schematic diagram of the whole structure of example;

[0039] Figure 2 It is the A part enlarged schematic diagram of Figure 1 ; 8, control mechanism; 81, control rod; 811, handle; 82, first control assembly; 821, rotating ring; 8211, locking hole; 822, fixed ring; 823, locking rod; 824, unlocking disc; 825, unlocking rod; 826, protrusion; 827, elastic piece; 828, positioning rod; 83, swing piece; 84, second control assembly; 841, sliding rod; 842, elastic piece; 843, fixed rod; 9, fixed seat; 10, hook; 101, pivot; 102, gear.

[0040] Figure 3 It is the schematic diagram of the first control assembly of example embodiment;

[0041] Figure 4 It is the B part enlarged schematic diagram of Figure 3 ; 8, control mechanism; 81, control rod; 811, handle; 82, first control assembly; 821, rotating ring; 8211, locking hole; 822, fixed ring; 823, locking rod; 824, unlocking disc; 825, unlocking rod; 826, protrusion; 827, elastic piece; 828, positioning rod; 83, swing piece; 84, second control assembly; 841, sliding rod; 842, elastic piece; 843, fixed rod; 9, fixed seat; 10, hook; 101, pivot; 102, gear.

[0042] Figure 5 It is the schematic diagram of rotating ring of example embodiment;

[0043] Figure 6 It is the schematic diagram of the second control assembly of example embodiment;

[0044] Figure 7 It is the schematic diagram of gear of example embodiment.

[0045] In the drawing: 1, support rod;2, first fixed part;3, first rotating part;4, second fixed part;5, second rotating part;6, mobile rod;61, tooth groove;7, connecting seat;8, control mechanism;81, control rod;811, handle;82, first control assembly;821, rotating ring;8211, locking hole;822, fixed ring;823, locking rod;824, unlocking disc;825, unlocking rod;826, protrusion;827, elastic piece;828, positioning rod;83, swing piece;84, second control assembly;841, sliding rod;842, elastic piece;843, fixed rod;9, fixed seat;10, hook;101, pivot;102, gear. DETAILED DESCRIPTION

[0046] In order to make the technical scheme of the utility model better understood by the people in the art, the technical scheme of the utility model will be described clearly and completely below in combination with the drawings of the utility model. Based on the embodiments in the present application, other similar embodiments obtained by the people in the art without making creative efforts should all belong to the scope of protection of the present application. In addition, the directional words mentioned in the following embodiments, such as 'up', 'down', 'left', 'right', etc. are only the directions of the drawings, therefore, the directional words used are used to illustrate but not to limit the utility model.

[0047] The utility model will be further described below in combination with the drawings and preferred embodiments.

[0048] Embodiment: a medical retractor, see attached Figure 1 -attached Figure 7 , including support rod 1, drag hook 10, first fixed part 2, first rotating part 3, second fixed part 4, second rotating part 5, moving rod 6 and control mechanism 8, the support rod 1 is set as a vertical pole;The drag hook 10 is used to pull apart the surgical incision;The first fixed part 2 is arranged on the vertical pole;The first rotating part 3 is rotatably connected on the first fixed part 2, and the rotating axis of the first rotating part 3 is horizontal;The second fixed part 4 is fixedly connected on the first rotating part 3;The second rotating part 5 is rotatably connected on the second fixed part 4, and the rotating axis of the second rotating part 5 is perpendicular to the rotating axis of the first rotating part 3;The moving rod 6 is arranged on the second rotating part 5, and the length direction of the moving rod 6 is perpendicular to the rotating axis of the first rotating part 3 and perpendicular to the rotating axis of the second rotating part 5, and the moving rod 6 moves on the second rotating part 5 along the length direction thereof;The control mechanism 8 is used to control the locking and loosening of the first rotating part 3, the second rotating part 5 and the moving rod 6 simultaneously.

[0049] When using, the surgical incision is pulled apart by the drag hook 10, and when pulling apart, the posture of the drag hook 10 is adjusted by the rotation of the first rotating part 3, the rotation of the second rotating part 5 and the movement of the moving rod 6, and by the arrangement of the control mechanism 8, the locking and loosening of the first rotating part 3, the second rotating part 5 and the moving rod 6 can be controlled simultaneously, so that the operator can control the drag hook 10 to adjust multiple degrees of freedom simultaneously, and the operation of the retractor is more convenient and fast.

[0050] Specifically, the control mechanism 8 includes a first control assembly 82, and the first control assembly 82 is arranged at the connection between the first rotating part 3 and the first fixed part 2 and the connection between the second rotating part 5 and the second fixed part 4.

[0051] Specifically, the first control assembly 82 comprises a rotating ring 821, a fixed ring 822, locking rods 823, elastic members 827 and an unlocking disc 824, the rotating ring 821 is fixedly connected to the first rotating part 3 or the second rotating part 5, the fixed ring 822 is fixedly connected to the first fixed part 2 or the second fixed part 4, the rotating ring 821 and the fixed ring 822 are coaxially arranged, the axis of the rotating ring 821 arranged on the first rotating part 3 overlaps the rotating axis of the first rotating part 3, and the axis of the rotating ring 821 arranged on the second rotating part 5 overlaps the rotating axis of the second rotating part 5, the side of the rotating ring 821 close to the fixed ring 822 is provided with a plurality of locking holes 8211 arranged around the axis of the fixed ring 822, the locking rods 823 are provided in plurality, the plurality of locking rods 823 are arranged around the axis of the fixed ring 822, the number of the locking holes 8211 is greater than or equal to the number of the locking rods 823, and the plurality of locking rods 823 can be simultaneously inserted into the locking holes 8211, the elastic members 827 are used to apply elastic force to the locking rods 823 to push the locking rods 823 to be inserted into the locking holes 8211, the unlocking disc 824 is arranged between the plurality of locking rods 823, the locking rods 823 are provided with clamping grooves on the side close to the unlocking disc 824, and the unlocking disc 824 is clamped into the clamping grooves so that the unlocking disc 824 can drive the plurality of locking rods 823 to simultaneously move.

[0052] Taking the first rotating part 3 and the first fixed part 2 as an example, when the unlocking disc 824 is not subjected to external force, under the action of the elastic members 827, the locking rods 823 move towards the rotating ring 821 to be inserted into the locking holes 8211, so that the rotating ring 821 and the fixed ring 822 are locked and cannot rotate relative to each other, so that the first rotating part 3 and the first fixed part 2 cannot rotate relative to each other, when the unlocking disc 824 moves towards the fixed ring 822 under the action of external force, the plurality of locking rods 823 are simultaneously driven to move towards the fixed ring 822, and then the plurality of locking rods 823 are driven to be separated from the locking holes 8211, so that the locking between the rotating ring 821 and the fixed ring 822 is released, so that the first rotating part 3 can rotate on the first fixed part 2.

[0053] Specifically, the first control assembly 82 further comprises an unlocking rod 825, the unlocking rod 825 is fixedly connected to the side of the unlocking disc 824 close to the rotating ring 821 and coaxial with the rotating ring 821, and the unlocking rod 825 penetrates through the rotating ring 821, the control mechanism 8 further comprises a swinging member 83, the swinging member 83 is rotatably connected at the connection between the first rotating part 3 and the second fixed part 4, the unlocking disc 824 is fixedly connected with a transmission protrusion 826 away from the unlocking rod 825, one side of the swinging member 83 is in contact with the transmission protrusion 826 in the second fixed part 4, and the other side is in contact with the unlocking rod 825 away from the unlocking disc 824 in the first rotating part 3.

[0054] When the locking rods 823 in the second rotating part 5 move towards the fixed ring 822 under the action of external force, the swing member 83 is pushed to swing by the transmission protrusions 826 in the second fixed part 4, and then the locking rods 823 in the first rotating part 3 are pushed to move towards the fixed ring 822 by the swing member 83, so that the control of the two control assemblies can be realized at the same time.

[0055] Specifically, the elastic member 827 is a spring, the fixed ring 822 is fixedly connected with positioning rods 828 corresponding to the plurality of locking rods 823, the positioning rods 828 are respectively inserted into the corresponding locking rods 823, the locking rods 823 slide on the positioning rods 828 to guide the sliding of the locking rods 823, and the spring is shot outside the corresponding positioning rod 828 and connected at both ends of the positioning rod 828 and the locking rod 823.

[0056] Specifically, the embodiment further includes a fixed seat 9, the moving rod 6 passes through the fixed seat 9 along the length direction of the moving rod 6 and can slide on the fixed seat 9, and the second rotating part 5 is fixedly connected to the fixed seat 9 away from the second fixed part 4; the control mechanism 8 further includes a control rod 81, the length direction of the control rod 81 is parallel to the length direction of the moving rod 6, the control rod 81 passes through the fixed seat 9 along the length direction of the control rod 81, the control rod 81 is provided as a round rod, the control rod 81 can slide on the fixed seat 9 along the length direction of the control rod 81 and can rotate around the axis of the control rod 81, one side of the control rod 81 is provided as a control plane, the distance between the control plane and the axis of the control rod 81 is less than the radius of the control rod 81, and the unlocking rod 825 in the second rotating part 5 extends into the fixed seat 9 and contacts the outside of the control rod 81 away from the fixed seat 9; when the arc surface outside the control rod 81 contacts the control rod 81 in the second rotating part 5, the locking rods 823 in the two first control assemblies 82 are all separated from the locking holes 8211; when the control plane outside the control rod 81 contacts the control rod 81 in the second rotating part 5, the locking rods 823 in the two first control assemblies 82 are all inserted into the locking holes 8211.

[0057] Specifically, the moving rod 6 is provided with a plurality of tooth grooves 61 arranged along the length direction of the moving rod 6 on the side close to the control rod 81; the control mechanism 8 further includes a second control assembly 84, and the second control assembly 84 is arranged in the fixed seat 9 and located between the moving rod 6 and the control rod 81.

[0058] The second control assembly 84 comprises a sliding rod 841, engagement teeth and a spring 842, the length direction of the sliding rod 841 is parallel to the length direction of the moving rod 6 and the control rod 81, and the sliding rod 841 can slide along the length direction of itself in the fixed seat 9; the sliding rod 841 is fixedly connected with a plurality of engagement teeth capable of engaging with the tooth groove 61 at the end close to the moving rod 6; the spring 842 is used for applying a spring force to the sliding rod 841 in the direction of the control rod 81; when the control plane outside the control rod 81 is in contact with the control rod 81 in the second rotating part 5, the arc surface outside the control rod 81 is in contact with the sliding rod 841, at this time, the engagement teeth are engaged with the tooth groove 61; when the arc surface outside the control rod 81 is in contact with the control rod 81 in the second rotating part 5, the control plane outside the control rod 81 is in contact with the sliding rod 841, at this time, the engagement teeth are disengaged from the tooth groove 61.

[0059] Through the setting of the second control assembly 84, the locking and loosening of the moving rod 6 can be controlled while the locking and loosening of the first rotating part 3 and the second rotating part 5 are controlled by the control rod 81.

[0060] Specifically, the sliding rod 841 is provided with a long strip hole penetrating the sliding rod 841, the length direction of the long strip hole slides along the length direction of the sliding rod 841; the long strip hole is provided with a fixed rod 843 penetrating the long strip hole, the fixed rod 843 is fixedly connected to the fixed seat 9, one end of the spring 842 is connected to the fixed rod 843, and the other end is connected to the sliding rod 841.

[0061] Specifically, the embodiment further comprises two connecting seats 7, the two connecting seats 7 are respectively arranged at the two ends of the moving rod 6, the two ends of the control rod 81 are respectively rotationally connected to the two connecting seats 7, and the drag hook 10 is arranged on one of the connecting seats 7.

[0062] Specifically, the drag hook 10 is fixedly connected with a rotating shaft 101, the rotating shaft 101 is rotationally connected to the connecting seat 7, and a gear 102 located in the connecting seat 7 is arranged outside the rotating shaft 101; the second control assembly 84 is also arranged between the gear 102 and the control rod 81; the engagement teeth on the second control assembly 84 in the connecting seat 7 can engage with the gear 102, and the fixed rod 843 is fixedly connected to the connecting seat 7.

[0063] Specifically, the support rod 1 penetrates the first fixed part 2 in the vertical direction, the first fixed part 2 can vertically slide on the support rod 1, and the first fixed part 2 is threadedly connected with a bolt, and the end of the bolt can abut against the outside of the support rod 1. The sliding of the first fixed part 2 on the support rod 1 can further increase the height adjustment range of the drag hook 10, and through the setting of the bolt, the first fixed part 2 can be stably fixed at a suitable height on the moving rod 6.

[0064] Specifically, the control rod 81 is externally fixedly connected with a handle 811 perpendicular to the length direction of the control rod 81, and an operator pushes the control rod 81 to rotate by operating the handle 811, so as to simultaneously control the two first control assemblies 82 and the two second control assemblies 84.

[0065] The preferred embodiments of the present application have been described above, the protection scope of the present application is not limited to the above-mentioned embodiments, any technical scheme falling within the idea of the present application belongs to the protection scope of the present application. It should be noted that, for ordinary skilled in the art, some improvements and decorations without departing from the principle of the present application can also be considered as the protection scope of the present application.

Claims

1. A medical retraction device, characterized in that: Includes a support rod (1), which is configured as a vertical rod; A retractor (10) is used to open a surgical incision; The first fixing part (2) is provided on the vertical rod; The first rotating part (3) is rotatably connected to the first fixed part (2), and the rotation axis of the first rotating part (3) is horizontal. The second fixing part (4) is fixedly connected to the first rotating part (3); The second rotating part (5) is rotatably connected to the second fixed part (4), and the rotation axis of the second rotating part (5) is perpendicular to the rotation axis of the first rotating part (3). The moving rod (6) is disposed on the second rotating part (5). The length direction of the moving rod (6) is perpendicular to the rotation axis of the first rotating part (3) and perpendicular to the rotation axis of the second rotating part (5). The moving rod (6) moves along its own length direction on the second rotating part (5). and a control mechanism (8) for controlling the first rotating part (3), the second rotating part (5) and the moving rod (6) to lock and release simultaneously.

2. The medical retraction device according to claim 1, characterized in that: The control mechanism (8) includes a first control component (82), which has two parts and is respectively located at the connection between the first rotating part (3) and the first fixed part (2) and at the connection between the second rotating part (5) and the second fixed part (4).

3. A medical retraction device according to claim 2, characterized in that: The first control component (82) includes a rotating ring (821), which is fixedly connected to the first rotating part (3) or the second rotating part (5); A fixed ring (822) is fixedly connected to a first fixed part (2) or a second fixed part (4). A rotating ring (821) is coaxially arranged with the fixed ring (822). The axis of the rotating ring (821) arranged on the first rotating part (3) overlaps with the axis of rotation of the first rotating part (3). The axis of the rotating ring (821) arranged on the second rotating part (5) overlaps with the axis of rotation of the second rotating part (5). The rotating ring (821) near the fixed ring (822) has a plurality of locking holes (8211) arranged around the axis of the fixed ring (822). The locking rod (823) is provided in multiple ways, and the multiple locking rods (823) are arranged around the axis of the fixed ring (822). The number of locking holes (8211) is greater than or equal to the number of locking rods (823), and the multiple locking rods (823) can be inserted into the locking holes (8211) at the same time. An elastic element (827) is used to apply a spring force to the locking rod (823) to push the locking rod (823) into the locking hole (8211); And an unlocking disc (824), which is disposed between multiple locking rods (823). The locking rods (823) have a slot on the side near the unlocking disc (824). The unlocking disc (824) is inserted into the slot so that the unlocking disc (824) can drive the multiple locking rods (823) to move simultaneously.

4. A medical retraction device according to claim 3, characterized in that: The first control component (82) further includes an unlocking rod (825), which is fixedly connected to the unlocking disc (824) on the side near the rotating ring (821) and is coaxial with the rotating ring (821). The unlocking rod (825) passes through the rotating ring (821). The control mechanism (8) further includes a swing member (83), which is rotatably connected at the connection between the first rotating part (3) and the second fixed part (4); The unlocking disc (824) is fixedly connected to a conductive protrusion (826) on the side away from the unlocking rod (825). One side of the swing member (83) is in contact with the conductive protrusion (826) in the second fixed part (4), and the other side is in contact with the end of the unlocking rod (825) in the first rotating part (3) away from the unlocking disc (824).

5. A medical retraction device according to claim 4, characterized in that: It also includes a fixed base (9), the movable rod (6) passes through the fixed base (9) along its own length direction and can slide on the fixed base (9), and the end of the second rotating part (5) away from the second fixed part (4) is fixedly connected to the fixed base (9); The control mechanism (8) also includes a control rod (81), the length direction of the control rod (81) is parallel to the length direction of the moving rod (6), the control rod (81) passes through the fixed seat (9) along its own length direction, the control rod (81) is set as a round rod, the control rod (81) can slide on the fixed seat (9) along its own length direction and can rotate around its own axis; One side of the control lever (81) is set as a control plane, and the distance between the control plane and the axis of the control lever (81) is less than the radius of the control lever (81); The unlocking rod (825) in the second rotating part (5) extends into the fixed base (9) and contacts the outside of the control rod (81) at one end near the fixed base (9). When the arc surface outside the control rod (81) contacts the control rod (81) in the second rotating part (5), the locking rods (823) in the two first control components (82) disengage from the locking hole (8211). When the control plane outside the control rod (81) contacts the control rod (81) in the second rotating part (5), the locking rods (823) in the two first control components (82) are inserted into the locking hole (8211).

6. A medical retraction device according to claim 5, characterized in that: The moving rod (6) has a number of toothed grooves (61) arranged along the length of the moving rod (6) on the side near the control rod (81); The control mechanism (8) further includes a second control component (84), which is disposed in the fixed base (9) and located between the moving rod (6) and the control rod (81).

7. A medical retraction device according to claim 6, characterized in that: The second control component (84) includes a sliding rod (841), the length direction of which is parallel to the length direction of the moving rod (6) and the control rod (81), and the sliding rod (841) can slide within the fixed seat (9) along its own length direction; The sliding rod (841) has several meshing teeth that can mesh with the tooth groove (61) at one end near the moving rod (6). And a spring element (842) for applying a spring force to the sliding rod (841) in the direction of the control rod (81); When the control plane outside the control rod (81) contacts the control rod (81) inside the second rotating part (5), the arc surface outside the control rod (81) contacts the sliding rod (841), and at this time the meshing teeth mesh with the tooth groove (61); when the arc surface outside the control rod (81) contacts the control rod (81) inside the second rotating part (5), the control plane outside the control rod (81) contacts the sliding rod (841), and at this time the meshing teeth disengage from the tooth groove (61).

8. A medical retraction device according to claim 7, characterized in that: The sliding rod (841) is provided with an elongated hole that passes through the sliding rod (841), and the length direction of the elongated hole slides along the length direction of the sliding rod (841); A fixed rod (843) is provided inside the elongated hole and passes through the elongated hole. The fixed rod (843) is fixedly connected to the fixed base (9). One end of the elastic member (842) is connected to the fixed rod (843), and the other end is connected to the sliding rod (841).

9. A medical retraction device according to claim 8, characterized in that: It also includes a connecting seat (7), of which two connecting seats (7) are provided. The two connecting seats (7) are respectively provided at both ends of the moving rod (6), and the two ends of the control rod (81) are respectively rotatably connected to the two connecting seats (7). The hook (10) is provided on one of the connecting seats (7).

10. A medical retraction device according to claim 9, characterized in that: A rotating shaft (101) is fixedly connected to the hook (10), and the rotating shaft (101) is rotatably connected to the connecting seat (7). A gear (102) located inside the connecting seat (7) is provided outside the rotating shaft (101). A second control component (84) is also provided between the gear (102) and the control lever (81).

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