CN214128655U - Bending control mechanism of medical instrument and medical instrument - Google Patents

Abstract

The utility model discloses a medical instrument's curved mechanism of accuse and medical instrument, wherein, curved mechanism of accuse includes accuse curved subassembly, spacing subassembly and first slider, first slider has latched position and locking and removes the position and can remove between latched position and locking and remove the position, and when the first slider is in latched position, the extension pipe with the first slider support press in accuse curved subassembly so that accuse curved subassembly with spacing subassembly intermeshing restricts accuse curved subassembly and extension pipe relative movement, makes the executor relatively fix in the extension pipe; when the first slide block is in the unlocking position, the actuator can bend relative to the extension pipe. The utility model discloses a accuse curved subassembly, spacing subassembly and first slider and the cooperation of extension pipe in the curved mechanism of accuse for the user can restrict the removal of the curved subassembly of accuse through removing first slider, and then restricts the relative turn between executor and the extension pipe, convenient operation.

Description

Bending control mechanism of medical instrument and medical instrument

Technical Field

The utility model relates to the field of medical equipment, especially, relate to a medical equipment including curved mechanism of accuse.

Background

In surgical procedures, staplers are often used to perform cutting and stapling of tissue, and a surgeon often requires proximal control to perform the cutting and stapling. The anastomat has the function principle that tissues are clamped through the end effector, then metal suturing nails in a nail bin of the anastomat are pushed out for forming, and the tissues are sutured together. In some staplers, a cutting knife is also provided for severing the stapled tissue.

In extreme cases, conventional linear staplers cannot effectively reach the surgical site to clamp, transect, and staple tissue, thus requiring an end effector that can be bent. Under the linear state, the bendable anastomat enters the thoracic cavity or the abdominal cavity through the puncture outfit, the bendable end effector can be controlled to be bent to a certain angle through the bending actuating mechanism, and then a series of operations such as clamping, transverse cutting, anastomosis and the like are carried out on the operation part. After the operation is finished, the patient is changed into a linear state again and is withdrawn from the body.

Meanwhile, the existing anastomat still has the risk of inconvenient operation or tissue injury caused by rebounding of the actuator, and due to the fact that a plurality of complex parts are arranged, the production cost is increased, the medical cost of a patient is improved, and the large-scale popularization and use of surgical instruments are not facilitated.

Therefore, at present, a bending execution control mechanism with convenient operation and low cost is urgently needed, so that an actuator can be firmly locked, and the bending with an extension pipe under unexpected force is prevented, and potential safety hazards are prevented.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem that the actuator of the existing anastomat rebounds to damage tissues, the embodiment of the disclosure aims to provide a bending control mechanism of a medical instrument and the medical instrument, wherein the actuator can be firmly locked.

In a first aspect, the present disclosure provides a bend-controlling mechanism of a medical instrument, the medical instrument including an actuator, a controller, and an extension tube, a proximal end of the actuator being pivotally connected to the extension tube, a proximal end of the extension tube being connected to the controller, the bend-controlling mechanism including a bend-controlling assembly, a limiting assembly fixed to the extension tube, and a first slider, the bend-controlling assembly being connected to the actuator such that the bend-controlling assembly limits bending of the actuator relative to the extension tube when the bend-controlling assembly and the extension tube are relatively fixed, the first slider having a locking position and a locking release position and being movable between the locking position and the locking release position, the extension tube pressing the first slider against the bend-controlling assembly when the first slider is in the locking position to allow the bend-controlling assembly and the limiting assembly to engage with each other to limit relative movement of the bend-controlling assembly and the extension tube, relatively fixing the actuator to the extension pipe; when the first sliding block is in the unlocking position, the bending control assembly can move relative to the limiting assembly, so that the actuator can bend relative to the extension pipe.

In some embodiments, the extension pipe is provided with a first protrusion, the first sliding block is provided with a second protrusion, and when the first sliding block is located at the locking position, the first protrusion and the second protrusion abut against each other to press the first sliding block against the bending control assembly, so that the bending control assembly and the limiting assembly are engaged with each other.

In some embodiments, the first protrusion is provided with a first actuating inclined surface, the second protrusion is provided with a second actuating inclined surface, and when the first slider moves from the unlocking position to the locking position, the extension pipe drives the first slider to move towards the bending control assembly through the first actuating inclined surface and the second actuating inclined surface, so that the first slider abuts against the bending control assembly.

In some embodiments, when the first slider is located at the unlocking position, the first protrusion and the second protrusion are staggered to form a space for the bending control assembly to move.

In some embodiments, the extension pipe is provided with a first groove recessed in a direction away from the first slider, and the second protrusion is located in the first groove when the first slider is located at the unlocking position.

In some embodiments, a limiting through hole is formed in the extension pipe, the first sliding block is provided with a limiting protrusion, and the movement range of the first sliding block is limited by the cooperation of the limiting through hole and the limiting protrusion.

In some embodiments, the bending control assembly and the limiting assembly are in an engaging structure, and when the first sliding block is in the locking position, the bending control assembly and the limiting assembly are engaged with each other through engaging teeth on the bending control assembly and the limiting assembly to limit the bending control assembly to move relative to the limiting assembly.

In some embodiments, the bending control assembly and/or the limiting assembly are provided with engaging teeth, so that during the relative movement of the bending control assembly and the limiting assembly, the bending control assembly and the limiting assembly form a plurality of engaging positions; when the bending control assembly is positioned at different meshing positions, the meshing teeth of the bending control assembly are matched with different meshing teeth on the limiting assembly and/or the meshing teeth of the limiting assembly are matched with different meshing teeth on the bending control assembly.

In some embodiments, the bending control assembly is further provided with a first connector, a proximal end of the first connector is connected with the bending control assembly, and a distal end of the first connector is connected with the actuator.

In some embodiments, the first connector is resilient.

In some embodiments, the device further comprises an operating component, the operating component has a first position and a second position and can move between the first position and the second position, the operating component is connected with the first sliding block, and when the operating component is switched from the first position to the second position, the operating component drives the first sliding block to move from the locking position to the unlocking position.

In some embodiments, a second connecting member is disposed between the operating assembly and the first sliding block, the operating assembly is movably mounted on the controller, a first end of the second connecting member is connected with the operating assembly, and a second end of the second connecting member is connected with the first sliding block; when the operating component moves from a first position to a second position, the second connecting piece and the first sliding block are driven to move.

In some embodiments, the operating assembly further comprises a first return elastic member, a first end of the first return elastic member is connected with the operating assembly, a second end of the first return elastic member is connected with the controller, and the first return elastic member is used for driving the operating assembly to move from the second position to the first position.

In some embodiments, the bending control mechanism further includes a second return elastic member, a first end of the second return elastic member is connected to the first slider, a second end of the second return elastic member is connected to the extension pipe, and the second return elastic member is configured to drive the first slider to move from the unlocking position to the locking position.

In some embodiments, the bend-controlling assembly is configured to engage the elongated tube to limit movement of the bend-controlling assembly in a direction along or opposite to the direction of extension of the elongated tube.

In some embodiments, the actuator can be turned to the first side or the second side relative to the extension tube, the bending control mechanism includes two bending control assemblies and two limiting assemblies, the two bending control assemblies are respectively located at the first side and the second side of the extension tube, the distal end of the bending control assembly located at the first side of the extension tube is connected with the first side of the actuator, the distal end of the bending control assembly located at the second side of the extension tube is connected with the second side of the actuator, the two limiting assemblies are respectively located at the first side and the second side of the extension tube, the limiting assembly located at the first side of the extension tube and the bending control assembly can be matched with each other, and the limiting assembly located at the second side of the extension tube and the bending control assembly can be matched with each other.

In some embodiments, when the actuator is bending to a first side relative to the elongated tube, the bending control assembly on the first side of the elongated tube is moved proximally and the bending control assembly on the second side of the elongated tube is moved distally, and when the actuator is bending to a second side relative to the elongated tube, the bending control assembly on the first side of the elongated tube is moved distally and the bending control assembly on the second side of the elongated tube is moved proximally.

In some embodiments, a medical instrument comprising a distal end effector, a controller at a proximal end, and an elongated tube to which the proximal end of the effector is pivotally connected and to which the proximal end of the elongated tube is connected, comprises a bend-controlling mechanism according to any of the embodiments described above.

Compared with the prior art, the advantages are that:

through the cooperation of the curved subassembly of accuse, spacing subassembly and first slider and extension pipe in the curved mechanism of accuse for can restrict the removal of the curved subassembly of accuse through removing first slider, and then restrict the relative turn between executor and the extension pipe, the structure is simple relatively, user convenient operation.

Drawings

Fig. 1 is an overall schematic view of a medical device according to one embodiment of the present disclosure.

FIG. 2 is a partially exploded schematic view of a medical device according to one embodiment of the present disclosure.

Fig. 3A is an initial state diagram (partially in section) of a medical device according to one embodiment of the present disclosure.

Fig. 3B is a schematic structural position diagram (with the operating assembly pulled proximally and partially in section) of a medical device according to one embodiment of the present disclosure.

Fig. 4 is a partially enlarged view of fig. 3A.

Fig. 5 is a partially enlarged view of fig. 3B.

FIG. 6 is a schematic structural view of a right outer tube according to one embodiment of the present disclosure.

FIG. 7 is a schematic structural view of a left inner tube according to one embodiment of the present disclosure.

FIG. 8 is a schematic structural diagram of a first slider according to an embodiment of the present disclosure.

FIG. 9 is a schematic structural view of a lower inner tube according to one embodiment of the present disclosure.

FIG. 10 is a schematic structural diagram of a bend control assembly according to an embodiment of the present disclosure.

FIG. 11 is a schematic illustration of the configuration of a medical instrument according to one embodiment of the present disclosure after a right bend in the effector after the operating assembly has been pulled proximally.

Fig. 12 is a partial schematic view of one side of the medical device of fig. 11.

Fig. 13 is a partial schematic structural view of the other side of the medical device of fig. 11.

Fig. 14 is a perspective view of fig. 12 (after removal of the elongated outer tube).

Fig. 15 is a perspective view of fig. 13 (after removal of the elongated outer tube).

FIG. 16 is a schematic illustration of the structural position of the medical instrument after left bending of the actuator as the operating assembly is pulled proximally in one embodiment of the present disclosure.

Fig. 17 is a partial, schematic structural view of one side of the medical device of fig. 16.

Fig. 18 is a partial schematic structural view of the other side of the medical device of fig. 16.

Fig. 19 is a schematic structural view of a second connector according to an embodiment of the present disclosure.

FIG. 20 is a schematic structural view of an upper inner tube according to one embodiment of the present disclosure.

Fig. 21 is a schematic structural diagram of a first return elastic element in one embodiment of the present disclosure.

Detailed Description

The present disclosure is described in further detail below with reference to the figures and specific examples. Advantages and features of the present invention will become apparent from the following detailed description and claims. It is noted that the drawings are in greatly simplified form and employ non-precise ratios for the purposes of facilitating and distinctly facilitating the description of the embodiments of the present invention.

Fig. 1 is an overall schematic view of a medical instrument according to one embodiment of the present disclosure, and as shown in fig. 1, the medical instrument includes an actuator 1 at a distal end, a controller 9 at a proximal end, and an extension tube between the actuator 1 and the controller 9, the extension tube includes an inner extension tube and an outer extension tube 3, and the actuator 1 can be bent left and right relative to the extension tube. And an intermediate connecting piece 2 can be arranged between the extension pipe and the actuator 1 according to the situation, and the intermediate connecting piece 2 is connected to the actuator 1 through a connecting rivet 10. In some embodiments, the controller 9 is a handle structure, and is provided with a firing trigger 8, and the firing trigger 8 is used for driving the operation of the implement 1. It should be understood that as used herein, "proximal" refers to the end that is closer to the operator during normal use, and correspondingly, "distal" refers to the end that is further from the operator.

The bending control mechanism comprises two bending control assemblies 13, a limiting assembly 19-1 and a first sliding block 14. In some embodiments, the extension tube comprises an outer extension tube 3 and an inner extension tube, the outer extension tube 3 being configured to wrap around the inner extension tube to prevent bacteria or other contaminants from entering the inner extension tube. The extension inner pipe is divided into an upper inner pipe 11 and a lower inner pipe 19, and the upper inner pipe 11 and the lower inner pipe 19 are matched to form a containing cavity for containing the bending control assembly 13, the limiting assembly 19-1 and the first sliding block 14. In some embodiments, the stop assembly 19-1 may be integrally formed with the elongated inner tube. It will be appreciated that the extension tube may alternatively be of unitary construction, i.e. the outer extension tube 3 is formed integrally with the inner extension tube. And in some alternative embodiments, the bending control mechanism comprises two bending control assemblies 13 and a limiting assembly 19-1, wherein one bending control assembly 13 and one limiting assembly 19-1 are positioned at the left side of the extension inner pipe and can be mutually engaged to limit the relative movement of the two, and the other bending control assembly 13 and the other limiting assembly 19-1 are positioned at the right side of the extension inner pipe and can be engaged to limit the relative movement of the two. And the far end of the bending control assembly 13 positioned on the left side of the extension inner pipe is connected with the left side of the actuator 1, and the far end of the bending control assembly 13 positioned on the right side of the extension inner pipe is connected with the right side of the actuator 1. Therefore, when the bending control assembly 13 is engaged with the limiting assembly 19-1, the bending control assembly 13 cannot move relative to the extension inner pipe, and the actuator 1 is further limited to bend left and right relative to the extension inner pipe (extension inner pipe). It should be understood that as used herein, "up" refers to an upward direction when the handle mechanism of the controller 9 is positioned vertically during normal use, and correspondingly, "down" refers to a downward direction; "left side" refers to a left side direction with respect to the operator when the handle mechanism of the controller 9 is vertically positioned during normal use, and correspondingly, "right side" refers to a right side direction with respect to the operator.

In some embodiments, when the actuator 1 bends to the right relative to the extension tube, the bending control assembly 13 on the right side of the extension tube is driven to move to the proximal end, the bending control assembly 13 on the left side of the extension tube is driven to move to the distal end, and when the actuator 1 bends to the left relative to the extension tube, the bending control assembly 13 on the right side of the extension tube is driven to move to the distal end, and the bending control assembly 13 on the left side of the extension tube is driven to move to the proximal end.

Fig. 3A, 3B, 4 and 5 illustrate how the stop assembly 19-1, the first slider 14 and the bend control assembly 13 in the extension inner tube cooperate with the upper inner tube 11 in some embodiments. The upper inner pipe 11, the first sliding block 14, the bending control assembly 13 and the limiting assembly 19-1 are sequentially arranged from top to bottom. The upper inner pipe 11 is provided with a first protrusion 11-1 protruding towards the first sliding block 14, the first sliding block 14 is provided with a second protrusion 14-2 protruding towards the upper inner pipe 11, and when the first sliding block 14 is located at the locking position, the first protrusion 11-1 and the second protrusion 14-2 are abutted to each other so as to press the first sliding block 14 against the bending control assembly 13. More specifically, the bending control component abutting surface 14-4 (please refer to fig. 8) at the bottom of the first sliding block 14 abuts against the bending control component 13, so that the bending control component 13 and the limiting component 19-1 are engaged with each other. When the first slider 14 is located at the unlocking position, as shown in fig. 5, the first slider 14 moves in the proximal direction, and the first protrusion 11-1 and the second protrusion 14-2 are staggered, so that the first slider 14 can move upward to release the pressing of the bending control component 13, and the bending control component 13 can also move upward to be disengaged from the limiting component 19-1. At this time, the bending control assembly 13 can move along the extending direction or the opposite direction of the extension pipe relative to the limiting assembly 19-1.

With further reference to fig. 4 and 10, in some embodiments, the bending control assembly 13 and the limiting assembly 19-1 are both in a meshed structure, in some embodiments, the bending control assembly 13 is in a rack structure, the limiting assembly 19-1 is a structure formed on the extension pipe and composed of a plurality of meshed teeth 19-1-1, and the limiting assembly 19-1 and the bending control assembly 13 can be meshed with each other. It should be understood that although shown in fig. 4, the stop assembly 19-1 is a structure having a plurality of engaging teeth 19-1-1 and is integrally formed with the extension pipe. In some embodiments, however, the stop assembly 19-1 may be a structure that is additional to the extension tube and the stop assembly 19-1 may be secured to the extension tube by a series of means such as bolts, welding, etc.

Optionally, the bending control assembly 13 and the limiting assembly 19-1 are provided with a plurality of engaging teeth, so that the bending control assembly 13 and the limiting assembly 19-1 form a plurality of engaging positions during the relative movement with the limiting assembly 19-1, and when the bending control assembly 13 and the limiting assembly 19-1 are in different engaging positions, the engaging teeth 13-1-1 of the bending control assembly 13 are matched with different engaging teeth 19-1-1 on the limiting assembly 19-1, and/or the engaging teeth 19-1-1 of the limiting assembly 19-1 are matched with different engaging teeth 13-1-1 on the bending control assembly 13. It should be understood that in alternative embodiments, the bending control assembly 13 may be provided with one engaging tooth 13-1-1 and the limiting assembly 19-1 may include a plurality of engaging teeth 19-1-1, and the bending control assembly 13 may also form a plurality of engaging positions with the limiting assembly 19-1 during the moving process, and it is not necessary that both the bending control assembly 13 and the limiting assembly 19-1 have a plurality of engaging teeth. In some embodiments, the stop assembly 19-1 is integrally formed with the extension tube, and more specifically, the stop assembly 19-1 is integrally formed with the lower inner tube 19.

In particular, the first protrusion 11-1 may be provided in plurality, for example, in some embodiments, 3 first protrusions 11-1 are provided. Accordingly, the second protrusions 14-2 may be provided in plural, and the number thereof is preferably the same as that of the first protrusions 11-1. The plurality of first protrusions 11-1 and the plurality of second protrusions 14-2 cooperate to make the force applied to the first slider 14 uniform, prevent the first slider 14 from being turned, tilted, etc.

More specifically, the upper inner pipe 11 is provided with first grooves, in which the first grooves are provided between the plurality of first protrusions 11-1. The first groove is recessed in a direction away from the first slider 14, and the second projection 14-2 is located in the first groove when the first slider 14 is located at the unlock position. Accordingly, the first slider 14 is provided with second grooves, in which the second grooves are provided between the plurality of second protrusions 14-2. The second groove is recessed in a direction away from the upper inner tube 11, and the first projection 11-1 is located in the second groove when the first slider 14 is located at the unlock position.

It should be understood that the first and second grooves are mainly provided to provide a larger movement space for the bending control assembly 13 to move, and in other embodiments, it is not necessary to provide the first and second grooves in the upper inner tube 11, as long as the first sliding block 14 is located at the unlocking position, the first sliding block 14 is not pressed by the upper inner tube 11, and a certain space for the bending control assembly 13 to move relative to the limiting member is left. Specifically, vertical space should be provided so that the bend-controlling assembly 13 can be disengaged from the stop assembly 19-1.

For the convenience of the user, in some embodiments, the controller 9 further includes an operating component and a second connecting member 18, the operating component is movably mounted on the controller 9, a first end of the second connecting member 18 is connected to the operating component, a second end of the second connecting member 18 is connected to the first slider 14, and moving the operating component drives the second connecting member 18 and the first slider 14 to move. In some alternative embodiments, as can be seen from fig. 2, 6 and 19, the operation assembly comprises a left outer tube 6 and a right outer tube 7, the right outer tube 7 is provided with a fixing post 7-1 (although not shown in the figures, the left outer tube 6 may also be provided with the fixing post 7-1), the second connecting member 18 may be a steel wire, a proximal end of the steel wire forms a proximal hooking ring 18-1, and a distal end of the steel wire forms a distal hooking ring 18-2.

In addition, the near-end hook ring 18-1 is arranged on the fixed column 7-1, and the far-end hook ring 18-2 is arranged on the first sliding block 14. Thus, the user can move the operating assembly proximally, which in turn moves the first slider 14 proximally. It should be understood that the operating components include, but are not limited to, the manner in which the left outer tube 6 and the right outer tube 7 are assembled, which may be an integrally formed structure. And although in some embodiments the operating assembly is mounted on the controller 9 for convenient use by the user, in other embodiments the operating assembly may be provided on the extension tube and optionally directly connected to the first slider 14 without the need for an additional second connecting member 18.

As can be seen from fig. 2, 3A, 3B and 21, in some alternative embodiments, a first restoring elastic member 20 is further included, a first end of the first restoring elastic member 20 (i.e., a first restoring elastic member distal end contact surface 20-1, please refer to fig. 21) is connected to the operating component, another end of the first restoring elastic member 20 (i.e., a first restoring elastic member proximal end contact surface 20-2, please refer to fig. 21) is connected to the controller 9, and the first restoring elastic member 20 is used for driving the operating component to move from the second position to the first position. More specifically, the controller 9 further comprises an operation inner tube fixed to the distal end of the controller 9 and having a first return spring 20 disposed between the operation inner tube and the operation assembly. It should be understood that the first return elastic member 20 may be directly abutted or connected with the controller 9, or indirectly connected with the controller 9 through other structures fixed with the controller 9, besides being connected with the controller 9 through the operation inner tube.

In some alternative embodiments, as can be seen from fig. 2, 6 and 7, the inner operation tube comprises a left inner tube 4 and a right inner tube 5, and the right outer tube 7 is provided with a first pressure spring contact surface 7-2. It will be appreciated that the left outer tube 6 is also provided with a first compression spring contact surface 7-2. And as shown in fig. 7, the left inner tube 4 is provided with a second compression spring contact surface 4-3 (and the right inner tube 5 is also provided with a similar compression spring contact surface).

The left inner tube 4, the right inner tube 5 and the first elastic resetting member 20 are wrapped by the operating component, a first end of the first elastic resetting member 20 abuts against the first pressure spring contact surface 7-2, and a second end of the first elastic resetting member 20 abuts against the second pressure spring contact surface 4-3. Thus, the first return spring 20 is further compressed when the operating assembly is moved from the first position (distal end) to the second position (proximal end), and when the user no longer applies a force to the operating assembly, the first return spring 20 urges the operating assembly to return from the second position into the first position.

In order to ensure that the displacement between the inner operating tube and the operating assembly is only translational and not rotational, since the operating assembly is displaced relative to the inner operating tube when the operating assembly is moved, in some alternative embodiments, as shown in fig. 6 and 7, the outer wall of the inner operating tube is provided with a guide projection 4-1 and the inner wall of the operating assembly is provided with a guide groove 7-3. The guide boss 4-1 is inserted into the guide groove 7-3 to restrict the relative movement of the operation inner tube and the operation member in the extending direction (from the distal end to the proximal end) of the guide groove 7-3 or in the opposite direction, and when the operation member is rotated about the extension tube, the operation inner tube is also rotated together.

With continued reference to fig. 7, the left inner tube 4 is provided with an inner tube notch 4-4. And the proximal end of the second connecting piece 18 can pass through the inner tube gap 4-4 to be connected with the fixed post 7-1 on the right outer tube 7. Specifically, the proximal end of the second connector 18 is exposed through the inner tube notch 4-4 so that the fixing post 7-1 can catch the proximal end of the second connector 18.

It will be appreciated that whilst in the above embodiments the inner operating tube is used with the operating assembly, in alternative embodiments the inner operating tube may be formed integrally with the controller 9, being part of the controller 9, leaving only the operating assembly. And the operation inner tube itself can also be the integrated into one piece structure, does not necessarily need to be formed through the amalgamation of left inner tube 4 and right inner tube 5. Similarly, the operating component can also be an integrally formed structure.

FIG. 8 is a schematic structural diagram of a first slider according to an embodiment of the present disclosure. As shown in fig. 8, the first slider 14 is provided with a stopper projection 14-1. The distal end of the second connecting member 18 forms a distal hook ring 18-2 sleeved on the limiting protrusion 14-1 of the first slider 14, so that a user can move from the distal end to the proximal end by manipulating the operating assembly to drive the first slider 14 to move towards the proximal end, and drive the first slider 14 to move from the locking position to the unlocking position. Meanwhile, in some embodiments, as can be seen from fig. 12, 13, 17, 18 and 20, the upper inner tube 11 is provided with a limiting through hole 11-2, and the limiting through hole 11-2 cooperates with the limiting protrusion 14-1 to limit the moving range of the first slider 14. And the first sliding block 14 can only move in the direction from the far end to the near end or in the opposite direction under the matching of the limiting through hole 11-2 and the limiting protrusion 14-1, and can not move left and right, so that the first sliding block 14 is prevented from shaking left and right. It should be understood that in the above embodiment, the stopper protrusion 14-1 for fixing the second connector 18 and the stopper protrusion 14-1 for engaging with the stopper through-hole 11-2 are one structure, but in other embodiments, the first slider 14 may be provided with two stopper protrusions 14-1 to achieve fixing of the second connector 18 and engaging with the stopper through-hole 11-2, respectively or simultaneously.

Also, in order to allow the bending control assembly 13 not to sway from side to side during movement, in some alternative embodiments, the bending control assembly 13 is configured to engage the extension pipe to limit the bending control assembly 13 to move in the direction of extension of the extension pipe or in the opposite direction. The lower inner tube 19 and the extension outer tube 3 are matched to form a containing cavity for containing the bending control assembly 13, and two sides of the bending control assembly 13 are respectively attached to the lower inner tube 19 and the extension outer tube 3. Specifically, as shown in fig. 10, the side of the bend control assembly 13 opposite to the outer extension tube 3 is provided with an arc-shaped surface 13-1-2 to better fit with the outer extension tube 3.

In order to better fix the lower inner tube 19 relative to the controller 9, in some alternative embodiments, the proximal end of the lower inner tube 19 is provided with a limiting groove 19-2 on each of the left and right sides. Wherein, fig. 9 is a schematic structural view of the lower inner tube according to one embodiment of the present disclosure, and a specific structure of the limiting groove 19-2 is shown in fig. 9. The left inner tube 4 and the right inner tube 5 are provided with inner bosses 4-2, and the lower inner tube 19 is fixed on the operation inner tube through the matching of the inner bosses 4-2 and the limiting grooves 19-2, and further fixed relatively with the controller 9.

With continued reference to fig. 10, the bending control assembly 13 further includes a first connecting member 13-2, and the proximal end of the first connecting member 13-2 is connected to the bending control assembly 13. And the distal end of the first connecting element 13-2 is connected with the actuator 1, and the first connecting element 13-2 has elasticity. It will be appreciated that in some embodiments, the first connector 13-2 need not necessarily be resilient, flexible to ensure that it can flex and rigid to allow it to remain configured to transmit axial forces to the other end when the proximal or distal end is subjected to such forces.

In some optional embodiments, the first sliding block 14 is further provided with an elastic member abutting surface 14-3, and the bending control mechanism further includes two second elastic return members 15, a first end of the second elastic return member 15 is connected to the first sliding block 14, and a second end of the second elastic return member 15 is connected to the extension pipe, so that when the user releases the operating assembly and returns the operating assembly to the first position, the first sliding block 14 can return to the locking position under the action of the second elastic return member 15 to re-lock the bending control assembly 13, thereby preventing the actuator 1 from bending with the extension pipe. Of course, in some embodiments, the number of the second elastic return members 15 can be selected according to the circumstances, and the elastic member abutting surface 14-3 of the first slider 14 can be adjusted. If a second elastic return element 15 can be provided and the second elastic return element 15 is directly abutted against the first slider 14, two elastic element abutting surfaces 14-3 are not required to be specially provided.

It should be understood that the first return spring 20 and the second return spring 15 may be springs or other structures having elastic properties.

Considering that the first slider 14 is obstructed by the first protrusion 11-1 during the movement from the unlocked position to the locked position, in some embodiments, as shown in fig. 4 and 5, the first protrusion 11-1 is provided with a first actuation ramp 11-3 and the second protrusion 14-2 is provided with a second actuation ramp 14-5.

When the first sliding block 14 moves from the unlocking position to the locking position, the first actuating inclined surface 11-3 and the second actuating inclined surface 14-5 cooperate to drive the first sliding block 14 to move towards the bending control component 13, so that the first protrusion 11-1 and the second protrusion 14-2 are oppositely arranged and mutually abut against each other to press the first sliding block 14 against the bending control component 13. And because the first sliding block 14 is pressed against the bending control assembly 13, the bending control assembly 13 is also pressed against the limiting assembly 19-1, so that the bending control assembly 13 is fixed on the extension pipe, and further the bending of the actuator 1 is limited, as shown in fig. 4.

In the initial state, as shown in fig. 3A and 4, the operating assembly is in the first position, the first slider 14 is in the locking position, the second protrusion 14-2 of the first slider 14 abuts against the first protrusion 11-1 of the upper inner tube 11, and the bottom of the first slider 14 abuts against the bending control assembly 13, so that the bending control assembly 13 and the limiting assembly 19-1 are engaged with each other. At this time, the actuator 1 cannot be bent with respect to the extension pipe. When a user operates the operation assembly to move from the first position to the second position, the second connecting member 18 connected to the operation assembly drives the first slider 14 to move from the locking position to the unlocking position, as shown in fig. 3B and 5, at this time, because a gap exists between the first slider 14 and the bending control assembly 13, the bending control assembly 13 is not pressed against the limiting assembly 19-1, and the bending control assembly 13 can move relative to the limiting assembly 19-1. At this time, the user can turn the actuator 1 to the left or right.

Referring to FIGS. 11-15, when actuator 1 is bent to the right relative to the elongated tube, the bend control assembly 13 on the right side moves proximally and the bend control assembly 13 on the left side moves distally. It will be appreciated that the operating assembly is now in the second position under the action of the external force, the first slider 14 is in the unlocking position, and the first return elastic element 20 and the second return elastic element 15 are also compressed. Therefore, when the user releases the operating assembly, the first elastic return element 20 will drive the operating assembly to return from the second position to the first position, and the second elastic return element 15 will drive the first sliding block 14 to return from the unlocking position to the locking position. Therefore, when the user releases the operating assembly, the first slider 14 will return from the unlocked position to the locked position, and the actuator 1 and the extension tube will not bend relative to each other and will remain at the angle shown in fig. 11-15 because the bending control assembly 13 is pressed by the first slider 14 to engage with the limiting assembly 19-1. Referring to fig. 16-18, when actuator 1 is bent to the left relative to the elongated tube, the bending control assembly 13 on the right side moves distally, and the bending control assembly 13 on the left side moves proximally. At this time, if the user releases the operating unit to return the first slider 14 from the unlocked position to the locked position, the actuator 1 and the extension pipe are not bent relative to each other and maintained at the angle shown in fig. 16 to 18 because the bending control unit 13 receives the pressure from the first slider 14 and engages with the stopper unit 19-1. When the user moves the operating assembly proximally again to move the operating assembly from the first position to the second position, in some embodiments, the actuator 1 and the extension tube may be returned to the initial linear state by the elastic knife bar 12 or the first connecting member 13-2 due to the medical instrument having the elastic knife bar 12 or the elastic first connecting member 13-2. It will be appreciated that in other embodiments, where the medical instrument does not have a flexible shaft 12 and the first coupling member 13-2 does not have flexibility, other structures may be provided to assist in the repositioning thereof, or to reposition the actuator 1 and extension tube to the initial linear position by manual adjustment by the user. In some alternative embodiments, as shown in FIG. 2, the proximal end of the elastic knife bar 12 is connected to a center bar linkage 16, the proximal end of the center bar linkage 16 is connected to a center bar 17, and the center bar 17 is connected to a firing mechanism (the firing mechanism is not shown in the figures) to effect control of the elastic knife bar 12.

The medical instrument provided by the present disclosure can control the bending control mechanism on the extension tube through the operation component on the controller 9, so that the operation of the user is relatively convenient. Moreover, the bending control assembly 13 adopts a rack type design, so that on one hand, the fixing performance between the bending control assembly 13 and the limiting assembly 19-1 is improved, the actuator 1 is prevented from bending under a locking state, on the other hand, the rack is provided with a plurality of meshing teeth, so that the actuator 1 can have a plurality of gears when bending relative to the extension pipe, and a user can have more choices for the bending angle between the actuator 1 and the extension pipe.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

The terms "plurality" and "a plurality" in the present disclosure and appended claims refer to two or more than two unless otherwise specified.

It is apparent that those skilled in the art can make various modifications and variations to the bending control mechanism of the medical device and the medical device disclosed in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (18)

1. A bend-controlling mechanism for a medical instrument, the medical instrument including an actuator, a controller, and an extension tube, a proximal end of the actuator being pivotally connected to the extension tube, a proximal end of the extension tube being connected to the controller, the bend-controlling mechanism including a bend-controlling assembly, a stop assembly secured to the extension tube, and a first slide, the bend-controlling assembly being connected to the actuator such that the bend-controlling assembly limits bending of the actuator relative to the extension tube when the bend-controlling assembly and the extension tube are relatively secured, the first slide having a locked position and an unlocked position and being movable between the locked position and the unlocked position, the extension tube pressing the first slide against the bend-controlling assembly when the first slide is in the locked position to allow the bend-controlling assembly and the stop assembly to interengage to limit relative movement of the bend-controlling assembly and the extension tube, relatively fixing the actuator to the extension pipe; when the first sliding block is in the unlocking position, the bending control assembly can move relative to the limiting assembly, so that the actuator can bend relative to the extension pipe.

2. The bending control mechanism according to claim 1, wherein the extension pipe is provided with a first protrusion, the first sliding block is provided with a second protrusion, and when the first sliding block is located at the locking position, the first protrusion and the second protrusion abut against each other to press the first sliding block against the bending control assembly, so that the bending control assembly and the limiting assembly are engaged with each other.

3. The bend-controlling mechanism according to claim 2, wherein the first protrusion is provided with a first actuating slope, the second protrusion is provided with a second actuating slope, and when the first slider moves from the unlocking position to the locking position, the extension tube drives the first slider to move towards the bend-controlling assembly through the first actuating slope and the second actuating slope, so that the first slider abuts against the bend-controlling assembly.

4. The bend-controlling mechanism according to claim 2, wherein when the first slider is located at the unlocking position, the first protrusion and the second protrusion are staggered to form a space for the bend-controlling assembly to move.

5. The bend-controlling mechanism according to claim 4, wherein the extension tube is provided with a first groove, the first groove is recessed away from the first slider, and the second protrusion is located in the first groove when the first slider is located at the unlocking position.

6. The bending control mechanism according to claim 1, wherein a limiting through hole is formed in the extension pipe, a limiting protrusion is formed on the first sliding block, and the movement range of the first sliding block is limited by the matching of the limiting through hole and the limiting protrusion.

7. The bending control mechanism according to claim 1, wherein the bending control assembly and the limiting assembly are in an engaging structure, and when the first sliding block is in the locking position, the bending control assembly and the limiting assembly are engaged with each other through engaging teeth on the limiting assembly to limit the movement of the bending control assembly relative to the limiting assembly.

8. The bending control mechanism according to claim 7, wherein the bending control assembly and/or the limiting assembly are provided with engaging teeth, so that during the relative movement of the bending control assembly and the limiting assembly, a plurality of engaging positions are formed by the bending control assembly and the limiting assembly; when the bending control assembly is positioned at different meshing positions, the meshing teeth of the bending control assembly are matched with different meshing teeth on the limiting assembly and/or the meshing teeth of the limiting assembly are matched with different meshing teeth on the bending control assembly.

9. The bend-controlling mechanism of claim 1, wherein said bend-controlling assembly is further provided with a first link, a proximal end of said first link being connected to said bend-controlling assembly, and a distal end of said first link being connected to said actuator.

10. The bend-controlling mechanism of claim 9, wherein the first link is resilient.

11. The bend-controlling mechanism according to claim 1, further comprising an operating member having a first position and a second position and being movable between the first position and the second position, the operating member being coupled to the first slider and moving the first slider from the locked position to the unlocked position when the operating member is switched from the first position to the second position.

12. The bending control mechanism according to claim 11, wherein a second connecting member is disposed between the operating assembly and the first sliding block, the operating assembly is movably mounted on the controller, a first end of the second connecting member is connected with the operating assembly, and a second end of the second connecting member is connected with the first sliding block; when the operating component moves from a first position to a second position, the second connecting piece and the first sliding block are driven to move.

13. The bend-controlling mechanism of claim 12, further comprising a first return spring, a first end of the first return spring being connected to the operating assembly, a second end of the first return spring being connected to the controller, the first return spring being configured to drive the operating assembly from the second position to the first position.

14. The bend-controlling mechanism according to claim 1, further comprising a second elastic return member, a first end of the second elastic return member being connected to the first slider, a second end of the second elastic return member being connected to the extension tube, the second elastic return member being configured to drive the first slider to move from the unlocking position to the locking position.

15. The bend-controlling mechanism of claim 1, wherein the bend-controlling assembly is configured to engage the elongated tube to limit movement of the bend-controlling assembly in a direction along or opposite to the direction of elongation of the elongated tube.

16. The bend-controlling mechanism according to any one of claims 1-15, wherein said actuator is capable of bending to a first side or a second side relative to said elongated tube, said bend-controlling mechanism comprising two of said bend-controlling assemblies and two of said limiting assemblies, said two of said bend-controlling assemblies being located on said first side and said second side of said elongated tube, respectively, and a distal end of said bend-controlling assembly located on said first side of said elongated tube being connected to said first side of said actuator, a distal end of said bend-controlling assembly located on said second side of said elongated tube being connected to said second side of said actuator, said two of said limiting assemblies being located on said first side and said second side of said elongated tube, respectively, said limiting assembly located on said first side of said elongated tube being cooperable with said bend-controlling assembly, and said limiting assembly located on said second side of said elongated tube being cooperable with said bend-controlling assembly.

17. The bend-controlling mechanism of claim 16, wherein said bend-controlling assembly on a first side of said elongated tube is caused to move proximally when said actuator is bending to a first side relative to said elongated tube and said bend-controlling assembly on a second side of said elongated tube is caused to move distally when said actuator is bending to a second side relative to said elongated tube, and wherein said bend-controlling assembly on said first side of said elongated tube is caused to move distally when said actuator is bending to a second side relative to said elongated tube and said bend-controlling assembly on said second side of said elongated tube is caused to move proximally when said actuator is bending to a second side relative to said elongated tube.

18. A medical instrument comprising a distal end effector, a proximally located controller, and an elongated tube to which the proximal end of the effector is pivotally connected and to which the proximal end of the elongated tube is connected, the bend-controlling mechanism of any one of claims 1-17 being comprised.

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