Surgical instrument

Abstract

The surgical instrument comprises a jaw assembly, a sleeve assembly, an angle steering part and a steering driving structure, one end of the angle steering part is connected with the jaw assembly, and the other end of the angle steering part is rotatably connected with the sleeve assembly; the angle steering part comprises a body and a protruding part arranged on the body, the protruding part comprises a first end far away from the jaw assembly, and the distance between the first end and the jaw assembly is larger than the distance between the rotating axis of the body and the jaw assembly; the steering driving structure comprises a push rod, and when the jaw assembly is in the straight hitting state, the push rod abuts against the first end of the protruding part and pushes the protruding part in response to the push rod so that the angle steering piece can rotate around the rotating axis, and the jaw assembly can be driven to rotate relative to the sleeve assembly. In the process that the jaw assembly rotates to the limiting position, the included angle between the driving force and the tangential force is firstly reduced and then increased and is always small, so that the tangential force is always in a large level, the jaw assembly can rotate smoothly, and the rotating angle of the jaw assembly relative to the sleeve assembly is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and in particular to a surgical instrument. Background Art

[0002] Surgical cutting staplers are commonly used medical instruments to replace manual suturing. Their main working principle is to use a cutting knife to separate tissues and titanium staples to staple them, similar to a stapler. There are many types of staplers according to their suitability for different parts of the body. For surgical cutting staplers, their working principle is to enter the patient's body through the cannula of the puncture device that is precisely positioned at the surgical site, and then make a longitudinal incision in the tissue and apply staples on the opposite side of the incision, thereby separating and staple the tissues.

[0003] The surgical instrument includes a jaw assembly, a sleeve assembly, an angle steering member and a steering drive mechanism. The jaw assembly is rotatably connected to the sleeve assembly through the angle steering member. When the steering drive mechanism is operated, the jaw assembly is driven to rotate relative to the sleeve assembly to achieve jaw steering. During surgery, medical personnel can operate the steering drive mechanism to rotate the jaw assembly to a suitable angle to clamp human tissue. In the prior art, the maximum angle of rotation of the jaw assembly relative to the sleeve assembly is about 40°, which cannot meet the needs of surgery in many cases. There is an urgent need for a stapler whose jaw assembly can rotate at a larger angle relative to the sleeve assembly. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention aims to provide a surgical instrument in which the jaw assembly has a larger rotation angle relative to the sleeve assembly, thereby meeting the needs of more surgeries.

[0005] The present invention is implemented by the following technical scheme: comprising a jaw assembly, a sleeve assembly, an angle steering member and a steering drive structure, wherein one end of the angle steering member is connected to the jaw assembly, and the other end is rotatably connected to the sleeve assembly; The angle turning member comprises a body and a protrusion provided on the body, the protrusion comprises a first end away from the jaw assembly, when the jaw assembly is in a straight striking state, the first end is located at the lower side of a first straight line, the first straight line passes through the rotation axis of the body and is perpendicular to the axis of the sleeve assembly; The steering drive structure includes a push rod that can move distally and proximally in a direction parallel to the axis of the sleeve assembly. When the jaw assembly is in a straight-hitting state, the push rod abuts against the first end of the protrusion. In response to the distal movement of the push rod, the push rod pushes the protrusion to cause the angle steering member to rotate around the rotation axis, thereby driving the jaw assembly to rotate relative to the sleeve assembly.

[0006] Further, the protrusion includes a first surface and abutment surface, the first surface is formed at the first end, the buttress surface is arranged on a side of the protrusion close to the rotation axis of the body and connected to the first surface, when the jaw assembly is in a straight striking state, the push rod butts against the first surface; when the jaw assembly is in a maximum rotation state, the push rod butts against the buttress surface; The line connecting the point of action of the push rod and the protrusion abutting against each other on the horizontal plane and the rotation axis is the driving radius. When the jaw assembly is in the direct hitting state, the driving radius and the first straight line form a first angle with each other; when the jaw assembly is in the maximum rotation state, the driving radius and the first straight line form a second angle with each other; when the jaw assembly switches from the direct hitting state to the maximum rotation state, the rotation angle of the jaw assembly relative to the sleeve assembly is equal to the sum of the first angle and the second angle.

[0007] Furthermore, the first angle is less than or equal to 40°, and the sum of the first angle and the second angle is greater than or equal to 60° and less than or equal to 70°.

[0008] Furthermore, when the jaw assembly is in the maximum rotation state, the distal end surface of the push rod is in contact with the abutment surface, so that the jaw assembly is maintained in the maximum rotation state.

[0009] Furthermore, the surgical instrument further comprises a locking member, the body is provided with a groove, and the locking member cooperates with the groove to lock the angle turning member; The angle turning member further comprises a reinforcing portion disposed on the body, wherein in the thickness direction of the body, the reinforcing portion is at least partially opposite to the groove. Further, the reinforcing portion is located on a side of the protruding portion close to the jaw assembly and connected to the protruding portion.

[0010] Furthermore, the surgical instrument also includes an angle connection assembly, which is connected between the jaw assembly and the sleeve assembly. When the jaw assembly rotates relative to the sleeve assembly from the straight hitting state, the angle connection assembly rotates with the jaw assembly. The reinforcement portion is provided with an avoidance slope on the side of the rotation axis of the main body, and the reinforcement portion avoids the rotating angle connection assembly through the avoidance slope.

[0011] Furthermore, the angle steering member includes two protrusions, and the two protrusions are respectively arranged on one side and the other side of the rotation axis along the transverse direction. The steering drive structure includes two push rods. When the jaw assembly is in a straight hitting state, the two push rods respectively resist the first ends of the two protrusions; one push rod moves distally to push the protrusion to rotate the body, and the other push rod moves proximally.

[0012] Further, the steering drive structure further comprises a drive assembly, the push rod is connected to the drive assembly; in response to the drive of the drive assembly, the push rod moves distally to push the protrusion. Further, the drive assembly comprises an operating handle, a transmission member and a gear member, the operating handle is in transmission connection with the gear member through the transmission member; The angle steering member includes two protrusions, which are laterally arranged on one side and the other side of the rotating axis respectively; the steering drive structure includes two push rods, which are provided with matching teeth, and the two push rods are respectively located on both sides of the gear member and are meshed with the gear member through the matching teeth; when the jaw assembly is in a straight hitting state, the two push rods respectively abut against the first ends of the two protrusions; in response to the operating handle being operated, the gear member rotates to drive the two push rods to move, and the movement directions of the two push rods are opposite.

[0013] Furthermore, the operating handle includes a locking portion, and the steering drive structure also includes a locking assembly. When the operating handle is in a locked position, the locking portion cooperates with the locking assembly; when the operating handle is in an unlocked position, the locking portion is separated from the locking assembly; in response to the operating handle being operated, the operating handle switches from the locked position to the unlocked position.

[0014] Furthermore, the operating handle is slidably connected to the transmission member, and the steering drive structure also includes an elastic member, one end of the elastic member is connected to the transmission member, and the other end is connected to the operating handle, and the elastic member is arranged along the sliding direction of the operating handle. When the operating handle is switched from the locked position to the unlocked position, the operating handle slides to separate from the locking assembly, and the elastic member is compressed; when the operating handle is switched from the unlocked position to the locked position, the elastic member is released, driving the operating handle to slide to cooperate with the locking assembly.

[0015] Furthermore, the surgical instrument also includes a limit member arranged on the angle steering member, the limit member is located on the side of the protrusion close to the rotation axis of the main body and is separated from the protrusion; the push rod has a first side away from the axis of the sleeve assembly and a second side close to the axis of the sleeve assembly, in response to the rotation of the angle steering member relative to the sleeve assembly, the first side of the push rod abuts against the protrusion, and the limit member is located on the second side of the push rod and is stopped by the push rod.

[0016] Furthermore, the push rod is provided with a mating groove, and when the jaw assembly is in a straight-hitting state, the limit member is separated from the mating groove; the limit member includes a first part and a second part, and in response to the rotation of the angle steering member relative to the sleeve assembly, the limit member rotates with the angle steering member, the first part enters the mating groove, and the second part is located on the second side of the push rod and is limited and stopped by the push rod.

[0017] Furthermore, the limit member also includes a main body portion of the angle turning member, the first part and the second part are both connected to the main body portion and protrude outward from the main body portion, and the protruding direction of the first part and the protruding direction of the second part form a certain angle with each other.

[0018] Compared with the prior art, the beneficial effects of the present invention are: when the jaw assembly is in a straight hitting state, the abutment point between the push rod and the raised portion is located below the first straight line, and during the process of the jaw assembly rotating to the extreme position, the angle between the driving force and the tangential force first decreases and then increases, and is always less than 40°. The tangential force is always at a relatively large level, and the rotation can be carried out smoothly, thereby improving the rotation angle of the jaw assembly relative to the sleeve assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of a surgical instrument according to a first embodiment of the present invention; Figure 2 It is a structural schematic diagram of the jaw assembly of the first embodiment of the present invention in a straight striking state; Figure 3 is a schematic structural diagram of an angle connection assembly according to a first embodiment of the present invention; Figure 4 is a schematic structural diagram of the jaw assembly in the first embodiment of the present invention in a maximum rotation state; Figure 5 It is a structural schematic diagram of the angle steering member and the angle connecting assembly when the jaw assembly of the first embodiment of the present invention is in the maximum rotation state; Figure 6 is an exploded view of a jaw assembly and a sleeve assembly according to a first embodiment of the present invention; Figures 7 to 10 It is a structural schematic diagram of the jaw assembly of the first embodiment of the present invention rotating from a straight hitting state to a maximum rotation state; Fig.11 and Fig.12 It is a schematic diagram of the structure of an angle steering member and a push rod in the prior art; Fig.13 is a schematic structural diagram of an angle steering member and a locking member according to a first embodiment of the present invention; Fig.14is a schematic structural diagram of an angle steering member according to a first embodiment of the present invention; Fig.15 is a cross-sectional view of an angle steering member according to a first embodiment of the present invention; Fig.16 is a schematic structural diagram of an angle connection assembly and an angle steering member according to a first embodiment of the present invention; Fig.17 is a schematic diagram of a steering drive structure according to a first embodiment of the present invention; Fig.18 is an exploded view of a steering drive structure according to a first embodiment of the present invention; Fig.19 is a schematic structural diagram of a driving portion and an end piece according to a first embodiment of the present invention; Fig. 20 It is a schematic structural diagram of the position-limiting member and the push rod when the jaw assembly of the first embodiment of the present invention is in a straight-hitting state; Figure 21 to Figure 23 It is a schematic structural diagram of a limiter and a push rod when the jaw assembly of the first embodiment of the present invention rotates relative to the sleeve assembly.

[0020] Wherein: 100, jaw assembly; 200, angle turning member; 210, body; 220, raised portion; 221, first end; 222, first surface; 223, abutting surface; 230, connecting hole; 240, outer peripheral surface; 250, matching portion; 251, groove; 260, wall portion; 270, reinforcing portion; 280, avoidance slope; 290, stopper; 291, block body; 292, first part; 293, second part; O, driving force; Q, tangential force; P, driving radius; U, first straight line; K, rotation axis; 300, steering drive structure; 310, push rod; 311, left push rod; 312, right push rod; 313, matching groove; 314, arc-shaped protrusion; 320, driving assembly; 321, operating handle; 3211, operating part; 3212, driving part; 3213, sliding block; 322, transmission member; 3221, end member; 3222, sliding groove; 3223, sliding space; 3224, tooth structure; 3225, elastic member; 323, gear member; 3231, left gear member; 3232, right gear member; 330, locking assembly; 331, locking groove; 400, sleeve assembly; 410, outer sleeve; 420, inner sleeve; 421, rotating shaft; 500, locking member; 600, cutting knife assembly; 610, knife bar; 700, angle connection assembly; 710, first angle connection member; 711, first receiving groove; 720, second angle connection member; 721, second receiving groove; 800, rack; DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] It should be understood that the terms "proximal" and "distal" used herein are relative to the clinician who manipulates the handle of the stapler. The term "proximal" refers to the part close to the clinician, and the term "distal" refers to the part away from the clinician. That is, the handle is the proximal side, and the jaw assembly is the distal side. For example, the proximal end of a component represents the end relatively close to the handle, and the distal end represents the end relatively close to the jaw assembly. The terms "upper" and "lower" are based on the relative positions of the anvil and the staple magazine seat of the jaw assembly. Specifically, the anvil is at the "upper" and the staple magazine seat is at the "lower". However, the stapler can be used in many directions and positions, so these terms expressing relative positional relationships are not restrictive and absolute.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms such as "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a movably connection, or an integral body; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements such as abutment. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. It should be noted that when there are qualifiers before "connected" and "connection", they have the meaning defined by the corresponding qualifiers, and only exclude situations that obviously need to be excluded, and do not exclude other possible situations. For example, "detachably connected" refers to a detachable connection, and does not include integration, but movable connection, etc. are not excluded. Example 1

[0024] The first embodiment of the present invention discloses a surgical instrument, which may be a stapler, such as Figures 1 to 5As shown, the surgical instrument includes a jaw assembly 100, a sleeve assembly 400, an angle steering member 200, a steering drive structure 300 and a cutting knife assembly 600. The jaw assembly 100 is rotatably connected to the sleeve assembly 400 through the angle steering member 200. When the surgical instrument is working, the jaw assembly 100 and part of the sleeve assembly 400 extend into the human body, and the medical staff manipulates the steering drive structure 300 to control the rotation of the jaw assembly 100 until the jaw assembly 100 rotates to a suitable position. During this process, the angle steering member 200 drives the jaw assembly 100 to rotate, and the rotation of the jaw assembly 100 drives the knife rod 610 of the cutting knife assembly 600 to bend, and then the medical staff controls the jaw assembly 100 to close to clamp the human tissue, and then controls the cutting knife assembly 600 to fire, so as to cut and suture the human tissue. After cutting and suturing are completed, the jaw assembly 100 is opened to release the tissue, and the jaw assembly 100 is rotated to a straight hitting state to remove the surgical instrument from the human body to complete the surgical operation.

[0025] Among them Figure 1 and Figure 6 As shown, one end of the angle steering member 200 is connected to the jaw assembly 100, and the other end is rotatably connected to the sleeve assembly 400. In response to the operation of the steering drive structure 300 by the medical staff, the angle steering member 200 rotates relative to the sleeve assembly 400, thereby driving the jaw assembly 100 to rotate relative to the sleeve assembly 400. The angle steering member 200 includes a body 210 and a protrusion 220 provided on the body 210. The steering drive structure 300 includes a drive assembly 320 and a push rod 310 connected to the drive assembly 320. When the jaw assembly 100 is in a straight-hitting state, the push rod 310 abuts against the protrusion 220. The straight-hitting state means that the length direction of the jaw assembly 100 is colinear or parallel to the axial direction of the sleeve assembly 400. When the medical staff operates the driving assembly 320 , in response to the driving of the driving assembly 320 , the push rod 310 moves distally to push the protrusion 220 to rotate the angle steering member 200 , so as to drive the jaw assembly 100 to rotate relative to the sleeve assembly 400 .

[0026] One of the sleeve assembly 400 and the angle steering member 200 is provided with a rotating shaft 421, and the other one is provided with a connecting hole 230. In this embodiment, the angle steering member 200 is provided with a connecting hole 230, and the sleeve assembly 400 is provided with a rotating shaft 421 as an example for explanation. The rotating shaft 421 is inserted into the connecting hole 230, and the axis of the rotating shaft 421 coincides with the axis of the connecting hole 230. The rotating shaft 421 cooperates with the connecting hole 230 to enable the angle steering member 200 to be rotatably connected to the sleeve assembly 400. The axis of the rotating shaft 421 is the rotating axis K of the angle steering member 200. When the steering drive structure 300 drives the angle steering member 200 to rotate, the angle steering member 200 rotates around the rotating axis K. Two push rods 310 are provided. In response to the operation of the medical staff, the drive assembly 320 drives one of the push rods 310 to move distally along a first direction. The first direction is parallel to the axial direction of the sleeve assembly 400 and points to the distal side of the sleeve assembly 400. As shown in FIG. Figure 7 As shown, the push rod 310 abuts against the protrusion 220 and applies a driving force O along the first direction to the protrusion 220. The force applied by the push rod 310 to the protrusion 220 generates a component force, which includes a tangential force Q and a radial force perpendicular to the tangential force Q. The line connecting the action point of the push rod 310 and the protrusion 220 on the horizontal plane and the rotation axis K is the driving radius P, and the driving radius P is set along the radial direction, wherein the horizontal plane is parallel to the upper surface of the body 210; the tangential force Q is perpendicular to the driving radius P, and the tangential force Q causes the angle steering member 200 to generate a tangential acceleration and thus rotate the angle steering member 200; the radial force is a component force perpendicular to the tangential force Q generated by the push rod 310, and will not play a driving or hindering role in the rotation of the angle steering member 200.

[0027] like Figures 7 to 10 As shown, during the rotation of the angle steering member 200, when the angle between the jaw assembly 100 and the sleeve assembly 400 is different, the position of the point of action of the push rod 310 and the protrusion 220 is different, so that the direction of the driving radius P is different, and therefore the direction of the tangential force Q is also different. Since the direction of the driving force O (the force applied to the protrusion 220) of the push rod 310 is fixed, it is the first direction. The tangential force Q is the component force of the driving force O, and the magnitude of the tangential force Q depends on the angle between the tangential force Q and the first direction. Specifically, the magnitude of the tangential force Q is equal to the driving force O multiplied by the cosine value of the angle between the two. The smaller the angle, the greater the tangential force Q, and the larger the angle, the smaller the tangential force Q.

[0028] In the prior art, such as Fig.11 and Fig.12As shown, when the jaw assembly 100 is in the straight hitting position, the driving radius P coincides with the first straight line U, and the first straight line U is perpendicular to the axial direction of the sleeve assembly 400 and intersects with the rotation axis K of the body 210. It can be seen that when the jaw assembly 100 is in the straight hitting position, the angle between the driving force O and the tangential force Q is 0. When the jaw assembly 100 rotates relative to the sleeve assembly 400, the angle between the jaw assembly 100 and the sleeve assembly 400 increases, and the angle between the tangential force Q and the driving force O also increases, and the tangential force Q gradually decreases. At the same time, the greater the bending of the knife bar 610 of the cutting knife assembly 600, the knife bar 610 has a certain elasticity, and the elastic force of returning to the jaw assembly 100 (making the jaw assembly 100 return to the straight hitting state) is applied to the jaw assembly 100, which prevents the jaw assembly 100 from continuing to turn. That is, the greater the angle of rotation of the jaw assembly 100 relative to the sleeve assembly 400, the smaller the tangential force Q driving the turning, and the greater the turning resistance. The maximum rotation angle of the jaw assembly 100 relative to the sleeve assembly 400 is approximately 40°, that is, when the angle steering member 200 rotates to the extreme position, the angle between the driving radius P and the first straight line U is approximately 40°. At this time, the angle between the tangential force Q and the driving force O is approximately 40°, which makes the tangential force Q smaller. At the same time, the knife rod 610 is bent more, resulting in a larger steering resistance. The driving force O of the steering drive structure 300 is insufficient to continue to drive the jaw assembly 100 to turn.

[0029] In the surgical instrument of this embodiment, the maximum rotation angle of the jaw assembly 100 relative to the sleeve assembly 400 exceeds the maximum turning angle of the jaw assembly 100 in the prior art, and can be applied to more surgical scenarios and better meet the needs of medical staff for the turning of the jaw assembly 100. Figure 7 As shown, the protrusion 220 includes a first end 221 away from the jaw assembly 100 . When the jaw assembly 100 is in the straight striking state, the first end 221 is located at the lower side of the first straight line U, and the lower side is specifically the side away from the jaw assembly 100 .

[0030] When the jaw assembly 100 is in the straight hitting state, the push rod 310 abuts against the first end 221 of the protrusion 220; at this time, the driving radius P is located below the first straight line U and forms a first angle with the first straight line U, and the angle between the tangential force Q and the driving force O is also the first angle. In a preferred embodiment, the first angle is less than 40°, such as 30° or 35°. At this time, the knife bar 610 does not bend and does not provide steering resistance, so that the driving force O provided by the steering drive structure 300 can drive the angle steering member 200 to rotate, thereby driving the jaw assembly 100 to turn. When the jaw assembly 100 is in the maximum rotation state, the driving radius P is located above the first straight line U and forms a second angle with the first straight line U. In a preferred embodiment, the second angle is less than or equal to 40°, such as 30° or 35°. In the process of switching the jaw assembly from the straight hitting state to the maximum rotation state, when the jaw assembly 100 rotates the first angle, the first straight line U coincides with the driving radius P, and the jaw assembly 100 rotates the second angle again and switches to the maximum rotation state. Therefore, the rotation angle of the jaw assembly 100 relative to the sleeve assembly 400 is equal to the sum of the first angle and the second angle. The maximum rotation angle of the jaw assembly 100 relative to the sleeve assembly 400 in the present application is 60-70°.

[0031] like Figure 7 and Figure 8 As shown, when the jaw assembly 100 is in the straight striking state, in response to the driving of the driving assembly 320, one of the push rods 310 moves distally along the first direction to push the protrusion 220, and the driving force O of the push rod 310 generates a tangential force Q perpendicular to the driving radius P, and the tangential force Q drives the angle steering member 200 to rotate; when the jaw assembly 100 rotates a first angle relative to the sleeve assembly 400, as shown in FIG. Fig. 9 As shown, the driving radius P substantially coincides with the first straight line U. At this time, the tangential force Q and the driving force O are located on the same straight line, and the driving force O no longer generates a radial component force (radial force). During the above process, the angle between the jaw assembly 100 and the sleeve assembly 400 gradually increases, but the angle between the driving force O and the tangential force Q gradually decreases. When the jaw assembly 100 continues to rotate from the position where the driving radius P substantially coincides with the first straight line U, it rotates to a second angle to reach the limit position, as shown in FIG. Fig.10 As shown, the second angle is less than or equal to 40°, at which time the angle between the tangential force Q and the driving force O is the second angle. In this process, the angle between the jaw assembly 100 and the sleeve assembly 400 increases, the angle between the driving force O and the tangential force Q also increases, the tangential force Q decreases, and the bending amplitude of the knife bar 610 increases, resulting in an increase in the steering resistance. When the jaw assembly 100 rotates to the extreme position, the tangential force Q is small, and the steering resistance generated by the knife bar 610 is large, and the driving force O of the steering drive structure 300 is insufficient to continue to drive the jaw assembly 100 to turn.

[0032] As can be seen from the above, in the process of the jaw assembly 100 of the surgical instrument in this embodiment rotating to the extreme position, the angle between the driving force O and the tangential force Q first decreases and then increases, and the maximum angle is less than or equal to 40°, the tangential force Q is always at a large level, and the rotation can be smoothly performed. The maximum rotation angle of the jaw assembly is substantially greater than the maximum turning angle of the jaw assembly 100 in the prior art by a first angle, and the first angle is less than or equal to 40°. In a preferred embodiment, the first angle is greater than or equal to 30°, and the second angle is less than or equal to 40°, so that the maximum rotation angle of the jaw assembly 100 relative to the sleeve assembly 400 is substantially 70°, which can be applied to more surgical scenes and better meet the medical staff's needs for the turning of the jaw assembly 100. At the same time, when the jaw assembly 100 is in a straight hitting state, the angle between the driving radius P and the first straight line U is greater than or equal to 30°, and at this time, the knife rod 610 is not bent, and no elastic force that hinders the rotation of the jaw assembly 100 is generated, so that the tangential force Q is sufficient to drive the jaw assembly 100 to rotate.

[0033] Further, such as Figures 7 to 10 As shown, the protrusion 220 includes a first surface 222 and abutting surface 223. The first surface 222 is formed at the first end 221. The butting surface 223 is provided on the side of the protrusion 220 close to the rotation axis K of the body 210 and connected to the first surface 222. The protrusion 220 is provided in a strip shape. When the jaw assembly 100 is in the straight striking state, the first surface 222 of the protrusion 220 corresponds to the push rod 310, and the push rod 310 abuts against the first surface 222. Correspondence means that in the length direction of the push rod 310, the push rod 310 is opposite to the first surface 222 of the protrusion 220; when the jaw assembly 100 is in the maximum rotation state, the push rod 310 abuts against the abutting surface 223. When the angle steering member 200 rotates, the protrusion 220 rotates accordingly, and the protrusion 220 is laterally offset during the rotation, so that the first surface 222 is offset from the push rod 310, and the abutment surface 223 of the protrusion 220 corresponds to the push rod 310, and the push rod 310 abuts against the abutment surface 223. When the jaw assembly 100 rotates to the maximum rotation state, when the angle steering member 200 rotates to the maximum angle, the abutment surface 223 abuts against the push rod 310, that is, during the rotation of the angle steering member 200, the push rod 310 always abuts against the protrusion 220 to avoid the protrusion 220 being completely offset from the push rod 310 due to lateral offset during rotation, and the push rod 310 cannot drive the angle steering member 200 to move.

[0034] like Fig.10As shown, when the jaw assembly 100 is in the maximum rotation state, the distal end face of the push rod 310 is in contact with the abutment surface 223. When the jaw assembly 100 is in the maximum rotation state, the bending amplitude of the knife bar 610 is the largest, and the elastic force generated by the knife bar 610 to return the jaw assembly 100 to the correct position is also the largest. After the jaw assembly 100 is turned, the jaw drive structure is no longer operated, and the locking assembly 330 locks the push rod 310. The push rod 310 abuts against the abutment surface 223 to limit the position of the jaw assembly 100, preventing the jaw assembly 100 from rotating in the direction of the elastic force of the knife bar 610. The distal end face of the push rod 310 is a plane, and the contact area is the largest when it is in contact with the abutment surface 223, so that the steering drive structure 300 has the best positioning effect on the jaw assembly 100, preventing the angle steering member 200 from rotating before being locked by the locking member 500, and thus keeping the jaw assembly 100 at the maximum angle expected by the medical staff.

[0035] Among them, Figure 1 , Fig.13 and Fig.14 As shown, the locking member 500 locks the angle steering member 200 when the jaw assembly 100 is closed, and the sleeve assembly 400 includes an outer sleeve 410, which is connected to the jaw assembly 100 and is in transmission connection with the locking member 500. After the jaw assembly 100 completes the steering, the medical staff operates the stapler to move the outer sleeve 410 distally, and the outer sleeve 410 moving distally drives the jaw assembly 100 to close, and at the same time drives the locking member 500 to move to lock the angle steering member 200, and the locked angle steering member 200 cannot rotate, so that the subsequent operation can be performed.

[0036] The body 210 of the angle steering member 200 has an outer peripheral surface 240, which is arranged on the outer periphery of the angle steering member 200 around the rotation axis K of the body 210. The body 210 also includes a matching portion 250 and a wall portion 260. The wall portion 260 has a certain thickness. The matching portion 250 is arranged on the inner side of the wall portion 260, and the outer peripheral surface 240 is located on the outer side of the wall portion 260. The wall portion 260 separates the matching portion 250 from the outer peripheral surface 240. Before the jaw assembly 100 is closed, the locking member 500 is separated from the matching portion 250, and the angle steering member 200 is not locked by the locking portion and can rotate freely. When the outer sleeve 410 moves distally to drive the jaw assembly 100 to close, it also drives the locking member 500 to move and cooperate with the matching portion 250 to lock the angle steering member 200. The surgical instrument includes a motion conversion structure, and the outer sleeve 410 is connected to the locking member 500 through a transmission mechanism to drive the locking member 500. In this application, only a preliminary introduction is given to the connection method between the locking member 500 and the outer sleeve 410. The specific structure of the locking member 500 and the motion conversion structure can be found in the applicant's prior application CN2023108009041.

[0037] The mating portion 250 includes a plurality of grooves 251 provided in the main body 210. The plurality of grooves 251 are arranged around the rotation center of the main body 210. The locking member 500 includes locking teeth. When the locking member 500 is mated with the mating portion 250, the locking teeth are inserted into the grooves 251 to lock the angle steering member 200. The grooves 251 are provided in the main body 210. The grooves 251 may reduce the overall strength of the angle steering member 200. When the jaw assembly 100 switches from a straight striking state to a steering state when steering, the angle steering member 200 must have sufficient strength to withstand the elastic force generated by the bending of the knife rod 610 during the movement of the jaw assembly 100 and when it remains in the steering state. The steering state refers to that the jaw assembly and the sleeve assembly form a certain angle with each other. Fig.15 As shown, the angle steering member 200 in this embodiment also includes a reinforcement portion 270, which is disposed on the upper surface of the main body 210. In the thickness direction of the main body 210, the reinforcement portion 270 at least partially corresponds to the groove 250. Specifically, the reinforcement portion 270 and the groove 251 are respectively located on both sides of the upper surface to enhance the strength of the portion of the main body 210 where the groove 250 is opened, thereby avoiding possible damage to the angle steering member 200 during the steering process of the jaw assembly 100 and when the jaw assembly 100 remains in the steering state.

[0038] Among them, Figure 7 and Fig.15 As shown, the reinforcing portion 270 is located on the side of the protruding portion 220 close to the jaw assembly 100 to avoid contact with the push rod 310, so as to avoid affecting the rotation of the angle steering member 200; preferably, the reinforcing portion 270 is connected to the protruding portion 220, and the connection between the reinforcing portion 270 and the protruding portion 220 can further enhance the strength of the reinforcing portion 270, thereby enhancing the strength of the angle steering member 200. More preferably, in this embodiment, the reinforcing portion 270 and the protruding portion 220 are integrally formed, and the reinforcing portion 270 extends in the direction of the jaw assembly 100.

[0039] like Figure 3 , Figure 5As shown, the surgical instrument further includes an angle connection assembly 700, which is connected between the jaw assembly 100 and the sleeve assembly 400. When the jaw assembly 100 rotates relative to the sleeve assembly 400 from the straight striking state, the angle connection assembly 700 rotates with the angle steering member 200. The angle connection assembly 700 is used to accommodate the knife rod 610 of the cutting knife assembly 600. Preferably, the angle connection assembly 700 includes a first angle connection member 710 and a second angle connection member 720. The distal end of the first angle connection member 710 is rotatably connected to the jaw assembly 100, and the proximal end is rotatably connected to the distal end of the second angle connection member 720. The proximal end of the second angle connection member 720 is rotatably connected to the sleeve assembly 400 and can slide along the length direction of the sleeve assembly 400. The first angle connecting member 710 is provided with a first receiving groove 711, and the second angle connecting member 720 is provided with a second receiving groove 721. The knife bar 610 passes through the second receiving groove 721 and the first receiving groove 711 in sequence to enter the jaw assembly 100. Figure 3 As shown, when the jaw assembly 100 is in the straight striking state, the first angle connector 710 and the second angle connector 720 are arranged along the length direction of the sleeve assembly 400; Figure 5 As shown, when the jaw assembly 100 is in the maximum rotation state, the first angle connector 710 and the second angle connector 720 are driven by the jaw assembly 100 to swing, and the first angle connector 710 and the second angle connector 720 are arranged in a broken line. In this embodiment, the jaw assembly 100 has a large rotation angle relative to the sleeve assembly 400, so the swing amplitude of the first angle connector 710 and the second angle connector 720 is also large, and the displacement in the lateral direction is large. The reinforcement part 270 may block the first angle connector 710 and the second angle connector 720, resulting in the jaw assembly 100 being unable to turn smoothly.

[0040] like Fig.16 As shown, the reinforcing portion 270 in this embodiment is provided with an avoidance slope 280 on one side of the rotation axis K of the body 210. The reinforcing portion 270 avoids the rotating angle connection component 700 through the avoidance slope 280. When the jaw assembly 100 is in the maximum rotation state, the angle connection component 700 is separated from the reinforcing portion 270. When the jaw assembly 100 is in the straight hitting state, the reinforcing portion 270 is located on one side of the angle connection component 700 in the lateral direction. When the jaw assembly 100 is in the maximum rotation state, the lateral displacement of the angle connection component 700 is the largest. The jaw assembly 100 does not contact the reinforcing portion 270. During the process of the jaw assembly 100 rotating from the straight hitting state to the maximum rotation state, it is always separated from the reinforcing portion 270. That is, during the rotation of the jaw assembly 100, the reinforcing portion 270 will not block the angle connection component 700, and will not hinder the rotation of the jaw assembly 100 relative to the sleeve assembly 400.

[0041] like Figure 7 As shown, the angle steering member 200 includes two protrusions 220, which are symmetrically arranged on the body 210. Specifically, the two protrusions 220 are symmetrical about a first plane, which passes through the center line of the jaw assembly 100 and is perpendicular to the upper surface of the body 210. The steering drive structure 300 includes two push rods 310, both of which are connected to the drive assembly 320, and the drive assembly 320 drives the push rods 310 to move to drive the angle steering member 200 to rotate.

[0042] The driving assembly 320 includes an operating handle 321, a transmission member 322 and a gear member 323. The operating handle 321 is connected to the gear member 323 through the transmission member 322. Figure 17 to Figure 18 As shown, the transmission member 322 is connected to the gear member 323, and the gear member 323 is connected to the angle steering member 200 through the push rod 310. In response to the rotation of the operating handle 321, the transmission member 322 is driven by the operating handle 321 to rotate, and the push rod 310 assembly is driven to move through the gear member 323. The gear member 323 converts the torque applied by the medical staff to the operating handle 321 into a force that drives the push rod 310 assembly to move linearly.

[0043] Specifically, Fig.17 and Fig.18As shown, there are two gear members 323, and a tooth structure 3224 is provided at the lower side of the transmission member 322. The two gear members 323 are respectively located on both sides of the transmission member 322 and mesh with the transmission member 322, and the two push rods 310 are respectively meshed with the two gear members 323. In response to the rotation of the operating handle 321, the transmission member 322 rotates to drive the gear members 323 on both sides to rotate, and the gear members 323 drive the two push rods 310 to move, thereby driving the angle steering member 200 to rotate. In this embodiment, the push rod 310 includes a left push rod 311 and a right push rod 312, and the left push rod 311 and the right push rod 312 respectively abut against the two protrusions 220 on both sides of the angle steering member 200, and the gear member 323 includes a left gear part and a right gear part, and the left gear part and the right gear part are connected to the frame 800 and are respectively arranged on both sides of the transmission member 322. The left gear part and the right gear part each include two coaxially arranged gears, the left push rod 311 meshes with the lower gear of the left gear part, the right push rod 312 meshes with the lower gear of the right gear part, and the transmission member 322 meshes with the upper gear of the left gear part and the upper gear of the right gear part at the same time. When the medical staff rotates the operating handle 321, the transmission member 322 drives the left gear part and the right gear part to rotate, and the rotation directions of the left gear part and the right gear part are opposite, so that the movement directions of the left push rod 311 and the right push rod 312 are opposite. The left push rod 311 and the right push rod 312 both extend along the length direction of the sleeve assembly 400. The distal ends of the left push rod 311 and the right push rod 312 respectively abut against the two protrusions 220 of the angle steering member 200. When the operating handle 321 rotates to drive the left push rod 311 and the right push rod 312 to move, such as when the operating handle 321 is rotated clockwise, the left push rod 311 moves toward the distal end, and the right push rod 312 moves toward the proximal end. The left push rod 311 pushes the left protrusion 220 of the angle steering member 200 to move toward the distal end, so that the angle steering member 200 rotates to the right, and the right abutting portion is driven to rotate and separate from the right push rod 312. When the operating handle 321 is rotated counterclockwise, the left push rod 311 moves toward the proximal end, and the right push rod 312 moves toward the distal end, the angle steering member 200 rotates to the left side so that the push rod 310 assembly can drive the angle steering member 200 to rotate, thereby driving the jaw assembly 100 to rotate.

[0044] The operating handle 321 has a locked position and an unlocked position. In the locked position, the operating handle 321 is locked by the locking assembly 330, and the medical staff cannot rotate the operating handle 321. In the unlocked position, the operating handle 321 is unlocked from the locking assembly 330, and the medical staff can rotate the operating handle 321. In response to the rotation of the operating handle 321, the transmission assembly drives the angle steering member 200 to move, thereby driving the jaw assembly 100 to rotate. Further, the operating handle 321 is slidably connected to the transmission member 322. When the operating handle 321 is moved, it slides relative to the transmission member 322 to switch from the locked position to the unlocked position. The operating handle 321 can slide relative to the transmission member 322 and can drive the transmission member 322 to rotate. How to achieve that the operating handle 321 can slide relative to the transmission member 322 and drive the transmission member 322 to rotate is described below. like Fig.18 and Fig.19 As shown, in a preferred embodiment, the operating handle 321 includes a locking portion, and the locking assembly 330 includes a locking groove 331. When the operating handle 321 is in the unlocked position, the locking portion is separated from the locking groove 331, and the medical staff can rotate the operating handle 321; when the operating handle 321 is in the locked position, the locking portion is plugged into the locking groove 331, and the operating handle 321 is locked and cannot be rotated.

[0045] The transmission member 322 is generally cylindrical, with a sliding space 3223 formed thereon, and a tooth structure 3224 cooperating with the gear assembly is provided at the bottom thereof. The sliding space 3223 is provided at the top of the transmission member 322, the operating handle 321 includes an operating portion 3211 and a driving portion 3212, the locking portion is provided at the driving portion 3212, the operating portion 3211 and the driving portion 3212 are plug-connected or integrally formed, and the operating portion 3211 drives the driving portion 3212 to rotate synchronously when the operating portion 3211 rotates, and the lower portion of the driving portion 3212 is located in the sliding space 3223. In this embodiment, when the jaw assembly 100 is in the straight hitting position, the sliding space 3223 is provided along the axial direction of the sleeve assembly 400, so that the operating handle 321 can slide along the axial direction of the sleeve assembly 400 relative to the transmission member 322, and the straight hitting position refers to that the length direction of the jaw assembly 100 is substantially consistent with the axial direction of the sleeve assembly 400. When the operating handle 321 is rotated, the operating handle 321 is first moved proximally or distally along the axis direction of the sleeve assembly 400 to switch from the locked position to the unlocked position, that is, the operating handle 321 is unlocked by pushing the operating handle 321 forward. The operating handle 321 includes a locking portion, and the locking assembly 330 includes a locking groove 331. When the operating handle 321 is in the unlocked position, the locking portion is separated from the locking groove 331, and when the operating handle 321 is in the locked position, the locking portion is plugged into the locking groove 331. The locking portion is, for example, a protrusion.

[0046] Further, the transmission member 322 includes a transmission member body and an end member 3221. The end member 3221 is located in the sliding space 3223 and is fixedly connected to the transmission member body. The end member 3221 is fixed to the transmission member body by screws. Specifically, the end member 3221 is located at the far end of the sliding space 3223. Both sides of the width direction of the end member 3221 are provided with slide grooves 3222. The length direction of the slide grooves 3222 is the same as the length direction of the sliding space 3223. The driving part 3212 includes two sliders 3213. The two sliders 3213 are respectively inserted into the two slide grooves 3222 on both sides of the end member 3221, so that the driving member and the end member 3221 are slidably connected. The operating handle 321 is slidably connected to the transmission member 322. When the operating handle 321 is rotated to the left, the right part of the slider 3213 abuts against the bottom of the right slide groove 3222, driving the transmission member 322 to rotate to the left, and the same applies to rotating to the right.

[0047] The steering drive structure 300 also includes an elastic member 3225, one end of the elastic member 3225 is connected to the transmission member 322, and the other end is connected to the operating handle 321. The elastic member 3225 is arranged along the sliding direction of the operating handle 321. When the operating handle 321 is in the unlocked position, the elastic member 3225 is compressed. When the operating handle 321 is in the locked position, the elastic member 3225 is released. The elastic force of the elastic member 3225 keeps the operating handle 321 in the locked position. For example, in this embodiment, the operating handle 321 moves along the axis direction of the sleeve to switch from the locked position to the unlocked position, specifically, moves distally along the axis direction of the sleeve assembly 400 to switch to the unlocked position. Before the medical staff operates the operating handle 321, the operating handle 321 is located in the locked position under the action of the elastic member 3225. The medical staff applies a forward pushing force to the operating handle 321 to make the operating handle 321 move distally to the unlocked position. The elastic member 3225 is compressed, and the operating handle 321 can be rotated while maintaining the forward pushing force on the handle to drive the jaw assembly 100 to rotate. After the steering is completed, the medical staff releases the operating handle 321, the elastic member 3225 is released, and the operating handle 321 is driven to return to the locked position. As can be seen from the above, after controlling the jaw assembly 100 to rotate, the medical staff releases the operating handle 321, and the locking assembly 330 can automatically switch and fix the operating handle 321 in the locked position, and automatically lock the two push rods 310 without the medical staff performing additional operations. When the operating handle 321 is not pushed, the operating handle 321 cannot be rotated, so that the medical staff cannot rotate the operating handle 321 by mistake, so that the jaw assembly 100 will not rotate due to the medical staff's mistaken operation. The structure of the steering drive assembly 320 is only preliminarily described in this embodiment, and the specific structure can be referred to the applicant's prior application CN2023108009639.

[0048] The distal ends of the two push rods 310 are respectively located on both sides of the inner sleeve 420. When the jaw assembly 100 is in the straight-hitting state, the distal ends of the two push rods 310 respectively abut against the first ends 221 of the two protrusions 220. When the medical staff does not operate the operating handle 321, the operating handle 321 and the transmission member 322 and the gear member 323 are all locked, so that the two push rods 310 are also locked. The locked push rods 310 limit the angle steering member 200 by abutting against the protrusion 220 to prevent the jaw assembly 100 from deviating from the straight-hitting state. When the medical staff rotates the operating handle 321 to rotate the angle steering member 200 to one side, one of the push rods 310 moves distally and the other push rod 310 moves proximally. In this embodiment, the angle steering member 200 is rotated to the left as an example. The medical staff first pushes the operating handle 321 forward to unlock the operating handle 321, and rotates the operating handle 321 to the left. The right push rod 310 moves distally and the left push rod 310 moves proximally. The right push rod 310 pushes the raised portion 220 on the right side of the angle steering member 200 to make the angle steering member 200 rotate to the left around the rotating shaft 421. In the length direction of the sleeve assembly 400, the raised portion 220 on the right side moves upward and the raised portion 220 on the left side moves downward. The right push rod 310 always presses against the right raised portion 220, and the left push rod 310 moves proximally and separates from the left raised portion 220. After the jaw assembly 100 is rotated to a suitable angle, the medical staff stops rotating the operating handle 321 and releases the operating handle 321. After the operating handle 321 is released, it moves proximally under the action of the elastic member 3225, so that the locking portion of the operating handle 321 cooperates with the locking assembly 330, so that the operating handle 321 and the gear member 323 are both locked, and then the left push rod 311 and the right push rod 312 are locked. The locked right push rod 312 abuts against the protrusion 220 of the angle steering member 200, and the locked left push rod 311 is separated from the angle steering member 200.

[0049] The driving assembly in the present application can also be in other forms, such as a motor driving a gear to rotate, and the gear is used to drive the push rod to move distally and proximally. It is also possible to rely on a power source (motor or operating handle) to drive the push rod to move distally and proximally through a connecting rod mechanism. The connecting rod mechanism may include a rotating rod rotatably arranged on the frame, the proximal end of the left push rod 311 and the proximal end of the right push rod 312 are respectively connected to the two sides of the rotating rod, the power source (motor or operating handle) is connected to the rotating rod, and in response to the drive of the power source, the rotating rod rotates, so that the left push rod 311 and the right push rod 312 move in opposite directions.

[0050] In this application, if Figure 20 to Figure 22As shown, the surgical instrument further includes a stopper 290 disposed on the angle steering member 200, the stopper 290 is located on the side of the protruding portion 220 close to the rotation axis K of the body 210 and is separated from the protruding portion 220, and the push rod 310 has a first side away from the axis of the sleeve assembly 400 and a second side close to the axis of the sleeve assembly 400; when the angle steering member 200 rotates, the first side of the push rod 310 abuts against the abutting surface 223 to prevent the angle steering member 200 from deflecting to the second side, and the stopper 290 is located on the second side of the push rod 310 and is limited by the push rod 310 to prevent the angle steering member 200 from deflecting to the first side. The deflection of the angle steering member 200 to the first side and the second side is limited, thereby preventing the angle steering member 200 from deflecting after the push rod 310 is locked. That is, after the two push rods 310 are locked, although one push rod 310 is separated from the angle steering member 200 , the other push rod 310 can stop the angle steering member 200 from rotating toward the first side or the second side, thereby locking the angle steering member 200 .

[0051] The push rod 310 is provided with a matching groove 313, which is provided at the bottom of the push rod 310, that is, provided at the side of the push rod 310 close to the upper surface of the angle steering member 200. When the jaw assembly 100 is in the straight striking state, the limiter 290 is separated from the matching groove 313, and in response to the rotation of the angle steering member 200 relative to the sleeve assembly 400, the limiter 290 rotates with the angle steering member 200, and a part of the limiter 290 enters the matching groove 313, and the other part abuts against the second side of the push rod 310 to limit and stop the push rod 310. When the angle steering member 200 rotates, the limit member 290 rotates accordingly and moves in the direction of the push rod 310 in the transverse direction (perpendicular to the axial direction of the sleeve assembly 400), and the limit member 290 always partially abuts against the second side of the push rod 310. The setting of the matching groove 313 avoids interference between the push rod 310 and the limit member 290, so that the rotation of the angle steering member 200 can be carried out normally.

[0052] Specifically, the stopper 290 is block-shaped and protrudes from the upper surface of the angle steering member 200. Two stoppers 290 are provided, corresponding to two push rods 310 respectively. The stopper 290 includes a block body 291, a first portion 292 and a second portion 293. The first portion 292 and the second portion 293 are both extended outward from the block body 291. The first portion 292 extends toward the push rod 310, and the direction in which the second portion 293 extends is at a certain angle to the first portion 292. The second portion 293 is located on a side of the limit member 290 close to the steering hole, and the first portion 292 is located on a side of the limit member 290 away from the steering hole. In response to the distal movement of the push rod 310, the angle steering member 200 rotates, and the limit member 290 rotates with the angle steering member 200. The first portion 292 is inserted into the matching groove 313, and the second portion 293 is located on the second side of the push rod 310 to limit the push rod 310. Furthermore, an arc-shaped protrusion 314 is also provided in the matching groove 313, and the limit member 290 rotates with the angle steering member 200. When the angle steering member 200 moves, the arc-shaped protrusion 314 guides the first part 292 to enter the matching groove 313 and approaches the block body 291 of the limiting member 290. When the angle steering member 200 deflects to the first side, the second part 293 resists the push rod 310. The greater the rotation angle of the angle steering member 200, the closer the end of the second part 293 is to the matching groove 313. When the angle steering member 200 rotates at a larger angle, the second part 293 corresponds to the arc-shaped protrusion in the matching groove 313 and is resisted by the arc-shaped protrusion 314 to limit the push rod 310.

[0053] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0054] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A surgical instrument, characterized in that: It comprises a jaw assembly, a sleeve assembly, an angle steering member and a steering drive structure, wherein one end of the angle steering member is connected to the jaw assembly, and the other end is rotatably connected to the sleeve assembly; The angle turning member comprises a body and a protrusion provided on the body, the protrusion comprises a first end away from the jaw assembly, when the jaw assembly is in a straight striking state, the first end is located at the lower side of a first straight line, the first straight line passes through the rotation axis of the body and is perpendicular to the axis of the sleeve assembly; The steering drive structure includes a push rod that can move distally and proximally in a direction parallel to the axis of the sleeve assembly. When the jaw assembly is in a straight-hitting state, the push rod abuts against the first end of the protrusion. In response to the distal movement of the push rod, the push rod pushes the protrusion to cause the angle steering member to rotate around the rotation axis, thereby driving the jaw assembly to rotate relative to the sleeve assembly.

2. The surgical instrument according to claim 1, characterized in that The protrusion includes a first surface and abutment surface, the first surface is formed at the first end, the buttress surface is arranged on a side of the protrusion close to the rotation axis of the body and connected to the first surface, when the jaw assembly is in a straight striking state, the push rod butts against the first surface; when the jaw assembly is in a maximum rotation state, the push rod butts against the buttress surface; The line connecting the point of action of the push rod and the protrusion abutting against each other on the horizontal plane and the rotation axis is the driving radius. When the jaw assembly is in the direct hitting state, the driving radius and the first straight line form a first angle with each other; when the jaw assembly is in the maximum rotation state, the driving radius and the first straight line form a second angle with each other; when the jaw assembly switches from the direct hitting state to the maximum rotation state, the rotation angle of the jaw assembly relative to the sleeve assembly is equal to the sum of the first angle and the second angle.

3. The surgical instrument according to claim 2, characterized in that The first angle is less than or equal to 40°, and the sum of the first angle and the second angle is greater than or equal to 60° and less than or equal to 70°.

4. The surgical instrument according to claim 1, characterized in that When the jaw assembly is in the maximum rotation state, the distal end surface of the push rod is in contact with the abutment surface, so that the jaw assembly is maintained in the maximum rotation state.

5. The surgical instrument according to claim 1, characterized in that The surgical instrument further comprises a locking member, the body is provided with a groove, and the locking member cooperates with the groove to lock the angle turning member; The angle turning member further includes a reinforcing portion disposed on the body, and in the thickness direction of the body, the reinforcing portion is at least partially opposite to the groove.

6. The surgical instrument according to claim 5, characterized in that The reinforcing portion is located on a side of the protruding portion close to the jaw assembly and is connected to the protruding portion.

7. The surgical instrument according to claim 5, characterized in that The surgical instrument also includes an angle connection assembly, which is connected between the jaw assembly and the sleeve assembly. When the jaw assembly rotates relative to the sleeve assembly from the straight hitting state, the angle connection assembly rotates with the jaw assembly. The reinforcement portion is provided with an avoidance slope on the side of the rotation axis of the main body, and the reinforcement portion avoids the rotating angle connection assembly through the avoidance slope.

8. The surgical instrument according to claim 1, characterized in that The angle steering member includes two protrusions, and the two protrusions are respectively arranged on one side and the other side of the rotating axis along the transverse direction. The steering drive structure includes two push rods. When the jaw assembly is in a straight hitting state, the two push rods respectively resist the first ends of the two protrusions; one push rod moves distally to push the protrusion to rotate the body, and the other push rod moves proximally.

9. The surgical instrument according to claim 1, characterized in that The steering drive structure further includes a drive assembly, and the push rod is connected to the drive assembly; in response to the driving of the drive assembly, the push rod moves distally to push the protrusion.

10. The surgical instrument according to claim 9, characterized in that The driving assembly comprises an operating handle, a transmission member and a gear member, and the operating handle is transmission-connected to the gear member through the transmission member; The angle steering member includes two protrusions, which are laterally arranged on one side and the other side of the rotating axis respectively; the steering drive structure includes two push rods, which are provided with matching teeth, and the two push rods are respectively located on both sides of the gear member and are meshed with the gear member through the matching teeth; when the jaw assembly is in a straight hitting state, the two push rods respectively abut against the first ends of the two protrusions; in response to the operating handle being operated, the gear member rotates to drive the two push rods to move, and the movement directions of the two push rods are opposite.

11. The surgical instrument according to claim 10, characterized in that The operating handle includes a locking portion, and the steering drive structure also includes a locking assembly. When the operating handle is in a locked position, the locking portion cooperates with the locking assembly; when the operating handle is in an unlocked position, the locking portion is separated from the locking assembly. In response to the operating handle being operated, the operating handle switches from the locked position to the unlocked position.

12. The surgical instrument according to claim 11, characterized in that The operating handle is slidably connected to the transmission member, and the steering drive structure further comprises an elastic member, one end of the elastic member is connected to the transmission member, and the other end is connected to the operating handle, and the elastic member is arranged along the sliding direction of the operating handle. When the operating handle is switched from the locking position to the unlocking position, the operating handle slides to separate from the locking assembly, and the elastic member is compressed; When the operating handle switches from the unlocking position to the locking position, the elastic member is released, driving the operating handle to slide to cooperate with the locking assembly.

13. The surgical instrument according to claim 1, characterized in that The surgical instrument also includes a limit member arranged on the angle steering member, the limit member is located on the side of the protrusion close to the rotation axis of the main body and is separated from the protrusion; the push rod has a first side away from the axis of the sleeve assembly and a second side close to the axis of the sleeve assembly, in response to the rotation of the angle steering member relative to the sleeve assembly, the first side of the push rod abuts against the protrusion, and the limit member is located on the second side of the push rod and is stopped by the push rod.

14. The surgical instrument according to claim 13, characterized in that The push rod is provided with a matching groove, and when the jaw assembly is in a straight-hitting state, the limit member is separated from the matching groove; the limit member includes a first part and a second part, and in response to the rotation of the angle steering member relative to the sleeve assembly, the limit member rotates with the angle steering member, the first part enters the matching groove, and the second part is located on the second side of the push rod and is limited and stopped by the push rod.

15. The surgical instrument according to claim 13, characterized in that The limiter also includes a main body portion of the angle turning member, the first part and the second part are both connected to the main body portion and protrude outward from the main body portion, and the protruding direction of the first part and the protruding direction of the second part form a certain angle with each other.

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