Medical instrument

Abstract

Provided is a medical instrument. The medical instrument comprises: a cannula assembly (20) comprising a cannula portion (22) and a housing (21) arranged at the proximal end of the cannula portion (22); an actuator assembly (30) detachably connected to the distal end of the cannula assembly (20) and configured to be rotatable about the axis of the cannula assembly (20) when connected to the cannula assembly (20); and a locking assembly (60) comprising a limiting member (606) and an operating member (50) connected to each other. The limiting member (606) is configured to move in the axial direction of the cannula assembly (20) so as to limit the rotational movement of the actuator assembly (30), and the operating member (50) is configured to be rotatable to drive the limiting member (606) to move in the axial direction of the cannula assembly (20). Using a rotatable operating member for control can save effort compared to other control methods.

Description

medical devices

[0001] Cross-reference to related applications

[0002] For all purposes, this patent application claims priority to Chinese Patent Application No. 202411601058.1, filed on November 8, 2024, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] This disclosure relates to a medical device. Background Technology

[0004] Medical devices include staplers. Staplers are used to transcribe, remove, and / or anastomose organs, tissues, or blood vessels in vivo, and are suitable for a variety of open or minimally invasive surgeries. Typically, a stapler includes a handle assembly, a cannula assembly, and an actuator assembly. The actuator assembly is releasably secured to the distal end of the cannula assembly. The actuator assembly includes a distal actuator. In minimally invasive surgery, the stapler is inserted into the patient's body through a trocar. Staplers can be laparoscopic staplers.

[0005] The actuator assembly is mounted on the cannula assembly and requires a locking structure to secure it. The locking assembly includes a limiter and a lever. In related technologies, the lever is mounted on a knob along the axial direction of the cannula assembly. The lever assembly moves the limiter along the axial direction to lock the actuator assembly. For example, the lever is moved axially to unlock or lock components on the actuator assembly. However, there is a large gap between the lever and the cannula assembly housing, which can easily expose this part of the instrument to a sterile environment, making it unsuitable for the reuse of the cannula assembly. Summary of the Invention

[0006] At least one embodiment of this disclosure provides a medical device comprising: a cannula assembly including a cannula portion and a housing disposed proximal to the cannula portion; an actuator assembly detachably connected to a distal end of the cannula assembly and configured to be rotatable about an axis of the cannula assembly when connected to the cannula assembly; and a locking assembly including a limiting member and an operating member interconnected thereto; the limiting member being configured to move axially along the cannula assembly to restrict rotational movement of the actuator assembly, and the operating member being configured to be rotatable to drive the limiting member to move axially in the cannula assembly.

[0007] For example, the locking assembly further includes a force conversion assembly located within the housing, the operating member being at least partially disposed on the outside of the housing, and the force conversion assembly being configured to convert rotational motion of the operating member into axial movement of the limiting member.

[0008] For example, the proximal end of the limiting member has a first mating portion, the force conversion assembly includes a connector, the connector has a second mating portion, and the first mating portion and the second mating portion are mated and connected.

[0009] For example, one of the first mating portion and the second mating portion includes a protrusion, and the other of the first mating portion and the second mating portion includes a groove that matches the protrusion.

[0010] For example, the force conversion assembly also includes a turntable, and the operating element is connected to the connecting element via the turntable.

[0011] For example, the operating element has a rotating shaft, the turntable has a through hole for receiving the rotating shaft, the rotating shaft matches the through hole, and the operating element is configured to drive the turntable to rotate.

[0012] For example, the operating member also has at least one positioning protrusion structure arranged around the rotating shaft, and the turntable has at least one positioning groove structure that matches the positioning protrusion structure, so that the operating member is relatively fixed to the turntable, thereby driving the turntable to rotate.

[0013] For example, the turntable has an eccentrically arranged drive shaft, the connector has a sliding hole extending radially along the sleeve assembly, the drive shaft is disposed in the sliding hole, and the operating member is configured to drive the turntable to rotate, thereby driving the drive shaft to move within the sliding hole, so as to drive the connector to move axially along the sleeve assembly, and thereby drive the limiting member to move.

[0014] For example, the force conversion assembly further includes a retaining ring configured to fix the actuating member to the turntable, thereby restricting the movement of the actuating member in the extension direction of the rotating shaft.

[0015] For example, the housing has a receiving groove, the operating member is disposed in the receiving groove, the receiving groove has a bottom surface, the bottom surface has a pivot hole, and the pivot of the operating member is connected to the force conversion assembly through the pivot hole.

[0016] For example, the cannula assembly includes a first inner tube and a first outer tube, the first inner tube being located inside the first outer tube, the distal end of the first inner tube having a blocking portion and a rotation channel, the blocking portion being configured to block circumferential rotation of the actuator assembly, the proximal end of the actuator assembly being configured to rotate circumferentially within the rotation channel of the cannula assembly when connected to the cannula assembly, and the axial movement of the cannula assembly is restricted when rotating within the rotation channel.

[0017] For example, the proximal end of the actuator assembly includes a mounting structure having a protrusion configured to be detachably mounted within the rotary channel.

[0018] For example, the proximal end of the actuator assembly includes a mounting tube comprising a second inner tube and a second outer tube, the second outer tube being located outside the second inner tube, and the proximal end of the second inner tube having the mounting structure.

[0019] For example, the distal end of the limiting member has a locking portion, the limiting member is configured in a first position to at least restrict the rotation of the protrusion within the rotation channel by the locking portion, so that the actuator assembly is in a locked state, and is configured in a second position to give way to the protrusion of the actuator assembly so that the actuator assembly is in an unlocked state.

[0020] For example, the locking portion includes at least one locking surface, the blocking portion includes at least one blocking surface, and the at least one locking surface and the at least one blocking surface match at least two sides of the protrusion to restrict the rotation of the protrusion within the rotation channel.

[0021] For example, the distal end of the limiting member is provided with a cantilever, and the locking part is located on the cantilever.

[0022] For example, the locking assembly further includes a spring, the cantilever has a slot extending axially along the sleeve assembly, the spring is located within the slot, and the limiting member is configured to return to its distal end axially along the sleeve assembly under the action of the spring force.

[0023] For example, the medical device is a stapler.

[0024] The medical device disclosed herein employs a rotatable manipulator to control a limiting member to unlock or lock the actuator assembly. The rotatable manipulator reduces effort and facilitates operation by the physician. In some embodiments, the manipulator is disposed within a receiving groove of the housing, the receiving groove having a bottom surface. The rotating shaft of the manipulator is connected to a force conversion assembly within the housing through a through hole in the bottom surface of the receiving groove, thereby improving the housing's sealing performance. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this disclosure and are not intended to limit this disclosure.

[0026] Figure 1 is a schematic diagram of a cannula assembly and actuator assembly in a medical device provided by an embodiment of the present disclosure.

[0027] Figure 2 is a bottom view of a cannula assembly and actuator assembly in a medical device provided by an embodiment of the present disclosure.

[0028] Figure 3 is a schematic diagram of a cannula assembly in a medical device provided by an embodiment of this disclosure.

[0029] Figure 4 is a partial schematic diagram of an actuator assembly in a medical device provided by an embodiment of the present disclosure.

[0030] Figure 5 is a partial schematic diagram of the connection between a cannula assembly and an actuator assembly in a medical device according to an embodiment of this disclosure.

[0031] Figure 6 is a partially enlarged schematic diagram of point B in Figure 5 (the limiting member is in the second position so that the actuator assembly is in the unlocked state).

[0032] Figure 7 is an exploded view of the installation of a limiting member of a medical device according to an embodiment of the present disclosure.

[0033] Figure 8 is an exploded view of the installation of a limiting member of a medical device according to an embodiment of the present disclosure from another angle.

[0034] Figure 9 is an exploded view of the installation of the operating element and force conversion assembly of a medical device according to an embodiment of the present disclosure.

[0035] Figure 10 is a schematic diagram of the installation of the operating element and force conversion assembly of a medical device provided in an embodiment of the present disclosure.

[0036] Figure 11 is a schematic diagram of a cannula assembly and a handle assembly in a medical device provided by an embodiment of the present disclosure.

[0037] Figure 12 is a schematic diagram of a limiting member in a medical device provided by an embodiment of the present disclosure, wherein the limiting member is in a first position so that the actuator assembly is in a locked state.

[0038] Figure 13 is a schematic diagram of another limiting member in a medical device provided by an embodiment of the present disclosure, positioned in a first position so that the actuator assembly is in a locked state. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0040] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “including,” “comprising,” or “containing,” and similar terms mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0041] In embodiments of this disclosure, the terms "proximal" and "distal" are used in relation to a clinician operating the medical device. "Proximal" refers to the portion of a component or structure closer to the clinician, while "distal" refers to the portion of a component or structure farther from the clinician.

[0042] Embodiments of this disclosure provide a medical device, as shown in Figures 1 to 8, comprising: a cannula assembly 20, an actuator assembly 30, and a locking assembly 60. As shown in Figures 1 to 3, the cannula assembly 20 includes a cannula portion 22 and a housing 21 disposed proximal to the cannula portion 22; the actuator assembly 30 (the proximal end of the actuator assembly 30) is detachably connected to the distal end of the cannula assembly 20, and the actuator assembly 30 (the proximal end of the actuator assembly 30) is configured to rotate about the axis of the cannula assembly 20 when connected to it. As shown in Figures 2, 5, 7, and 8, the locking assembly 60 includes a limiting member 606 and an operating member 50 interconnected. The limiting member 606 is configured to move axially along the cannula assembly 50 to restrict the rotational movement of the actuator assembly 30; the operating member 50 is connected to the limiting member 606 to drive the limiting member 606 to move axially along the cannula assembly 20. For example, the operating element 50 is configured to be rotatable to drive the limiting element 606 to move axially in the sleeve assembly 20. For example, the operating element 50 may be a toggle switch. For example, the limiting element 606 may be a locking tab.

[0043] The medical device provided in the embodiments of this disclosure has an actuator assembly 30 whose proximal end is detachably connected to the distal end of the cannula assembly 20. A rotatable operating member 50 is used to lock the actuator assembly 30 after installation, so that the actuator assembly 30 is always connected to the cannula assembly 20 during use. After use, the actuator assembly 30 can be separated from the cannula assembly 20 by moving the rotatable operating member 50.

[0044] The medical device provided in the embodiments of this disclosure has a rotatable operating element 50. Using the rotatable operating element 50 for control reduces effort compared to other control methods. For example, other control methods include sliding control.

[0045] For example, as shown in Figures 2, 7, and 11, the housing 21 has a receiving groove 213 within which the operating member 50 can be actuated. The operating member 50 is disposed within the receiving groove 213. The receiving groove 213 also helps to limit the degree of actuation of the operating member 50. For example, the operating member 50 can be actuated until it can no longer be actuated.

[0046] As shown in Figure 7, the receiving groove 213 has a bottom surface 214 with a pivot hole 215. The operating member 50 (the pivot 55 of the operating member 50) is connected to the structure located in the housing 21 (i.e., connected to the force conversion assembly 70 mentioned later) through the pivot hole 215.

[0047] The medical device provided in the embodiments of this disclosure uses a rotatable operating element 50 to control the limiting element 606, thereby realizing the locking and unlocking actions of the actuator assembly 30 and the cannula assembly 20. The rotatable operating element 50 can be mounted on the housing 21 through the rotating shaft 55 passing through the rotating shaft hole 215. The connection between the operating element 50 and the housing 21 has better sealing performance, which is conducive to the sealing and sterilization of the device. It can solve the problems of sealing the device and easy exposure to the sterile environment, and facilitate the reuse of the cannula assembly 20.

[0048] For example, as shown in Figures 1 to 3, 7, 8, and 11, the housing 21 includes an upper housing 211 and a lower housing 212. An operating element 50 is disposed on the lower housing 212 to facilitate its operation. The housing 21 can be referred to as a knob, the upper housing 211 as an upper knob, and the lower housing 212 as a lower knob. The housing 21 can be rotated circumferentially along the sleeve assembly 20. As shown in Figure 8, the housing 21 (lower housing 212) has an inner cavity 2127. A force conversion assembly 70 is disposed within the inner cavity 2127.

[0049] As shown in Figure 2, the design of the operating element 50 being rotatably mounted on the lower housing 212 (lower knob) is beneficial for sealing the instrument in this part.

[0050] For example, as shown in Figures 7 to 10, the locking assembly 60 further includes a force conversion assembly 70 located within the housing 21. The operating member 50 is at least partially disposed on the outside of the housing 21. The force conversion assembly 70 is connected to both the limiting member 606 and the operating member 50. For example, one end of the force conversion assembly 70 is connected to the limiting member 606, and the other end is connected to the operating member 50. At least a portion of the operating member 50 is disposed on the outside of the housing 21.

[0051] For example, the force conversion assembly 70 is configured to convert the rotational motion of the operating member 50 (toggle) into the axial movement of the limiting member 606 (locking piece).

[0052] For example, as shown in Figures 7 to 10, the proximal end of the limiting member 606 has a first mating portion 601, and the force conversion assembly 70 includes a connector 73, which has a second mating portion 733. The first mating portion 601 and the second mating portion 733 are engaged and connected. The connector 73 is disposed within the housing 21 and configured to move axially along the sleeve assembly 20. The frame of the housing 21 restricts the axial movement distance of the connector 73.

[0053] For example, as shown in Figures 7 to 10, one of the first mating part 601 and the second mating part 733 includes a protrusion, and the other of the first mating part 601 and the second mating part 733 includes a groove that matches the protrusion. The protrusion and the groove cooperate to connect the limiting member 606 and the connecting member 73.

[0054] For example, the limiting member 606 is rigidly connected to the connecting member 73.

[0055] For example, the connector 73 is installed in the lower housing 212 (lower knob) and has only one degree of freedom relative to the lower housing 212 (lower knob), namely, the movement of the proximal and distal ends (movement along the axial direction of the sleeve assembly 20). The sliding hole 736 on the connector 73 is connected to the drive shaft 77 of the turntable 71.

[0056] For example, as shown in Figures 7 to 10, the force conversion assembly 70 also includes a turntable 71, through which the operating member 50 is connected to the connecting member 73.

[0057] For example, as shown in Figures 7 to 10, the operating member 50 has a rotating shaft 55, and the turntable 71 has a through hole 711 for receiving the rotating shaft 55. The rotating shaft 55 matches the through hole 711, and the operating member 50 is configured to drive the turntable 71 to rotate.

[0058] For example, as shown in Figure 8, the operating member 50 has at least one positioning protrusion structure 552 arranged around the rotating shaft 55. The positioning protrusion structure 552 is located on opposite sides of the main body 551. The turntable 71 has at least one positioning groove structure that matches the positioning protrusion structure 552, so that the operating member 50 is relatively fixed to the turntable 71, thereby driving the turntable 71 to rotate. For example, the through hole 711 has a structure that matches the rotating shaft 55. The shapes of the rotating shaft 55 and the through hole 711 are adapted so that the operating member 50 can drive the turntable 71 to rotate. It should be noted that the adaptation method of the rotating shaft 55 and the through hole 711 is not limited to that shown in the figure.

[0059] For example, as shown in Figures 7 to 10, the turntable 71 has an eccentrically positioned drive shaft 77, and the connector 73 has a sliding hole 736 (e.g., a strip-shaped hole). The sliding hole 736 extends radially along the sleeve assembly 20. The drive shaft 77 is disposed within the sliding hole 736. The operating member 50 is configured to rotate the turntable 71, thereby causing the drive shaft 77 to move within the sliding hole 736, driving the connector 73 to move axially along the sleeve assembly 20, and further driving the limiting member 606 to move, that is, driving the limiting member 606 to move axially along the sleeve assembly 20. For example, the drive shaft 77 may be a cylindrical protrusion, but is not limited thereto. For example, the sliding hole 736 may be a racetrack-shaped hole, a rectangular hole, or an elliptical hole, etc., but is not limited thereto. The radial extension of the sliding hole 736 along the sleeve assembly 20 means that the extension direction of the sliding hole 736 is parallel to a diameter of the sleeve assembly 20. Alternatively, the radial extension of the sliding hole 736 along the sleeve assembly 20 means that the extension direction of the sliding hole 736 is perpendicular to the axial direction of the sleeve assembly 20. The extension direction of the sliding hole 736 refers to its length direction. As shown in Figure 9, the drive shaft 77 is not located at the center of the turntable 71, that is, the drive shaft 77 is eccentrically set.

[0060] For example, as shown in Figures 7 to 9, the force conversion assembly 70 also includes a retaining ring 72 disposed between the connector 73 and the turntable 71. The retaining ring 72 is mounted on the rotating shaft 55, thereby fixing the operating member 50 to the turntable 71 and restricting the movement of the operating member 50 in the extension direction of the rotating shaft 77. The retaining ring 72 serves as a fastener. For example, the retaining ring 72 may be an E-type retaining ring, but it is not limited to this and can be chosen as needed. Thus, the retaining ring 72 fixes the operating member 50 to the lower housing 212 to prevent the operating member 50 from falling off the lower housing 212.

[0061] For example, the operating component 50 is rigidly connected to the turntable 71 and the retaining ring 72.

[0062] For example, as shown in Figures 3, 5, 6, and 8, the sleeve assembly 20 includes a first inner tube 26 and a first outer tube 28, with the first inner tube 26 located within the first outer tube 28. As shown in Figure 6, the distal end of the first inner tube 26 has a blocking portion 29 and a rotation channel 25. The blocking portion 29 has a blocking surface S4 that is raised relative to the rotation channel 25, and the blocking surface S4 of the blocking portion 29 is configured to prevent the actuator assembly 30 from continuing to rotate after being inserted into the sleeve assembly 20. The proximal end of the actuator assembly 30 is configured to rotate circumferentially within the rotation channel 25 of the sleeve assembly 20 when connected to the sleeve assembly 20, and its axial movement within the sleeve assembly 20 is restricted during rotation within the rotation channel 25. The blocking portion 29 is configured to prevent the proximal end of the actuator assembly 30 from rotating circumferentially within the sleeve assembly 20. As shown in Figures 6, 8, and 12, the blocking surface S4 is the side surface of the blocking portion 29. The axial movement of the actuator assembly 30 in the sleeve assembly 20 in the structure shown in Figure 6 can be blocked by the limiting member 606.

[0063] For example, the movement of the proximal end of the actuator assembly 30 in the axial direction of the sleeve assembly 20 is restricted when the proximal end of the actuator assembly 30 rotates within the rotation channel 25, meaning that the actuator assembly 30 does not move distally along the axial direction of the sleeve assembly 20.

[0064] As shown in Figure 13, the first inner tube 26 also has a blocking surface S5, which is a wall surface of the rotation channel 25 disposed along the axial direction of the sleeve assembly 20. The blocking surface S5 restricts the movement of the proximal end of the actuator assembly 30 in the axial direction of the sleeve assembly 20. That is, the blocking portion 29 is configured to block the rotation of the proximal end of the actuator assembly 30 in the circumferential direction and the movement of the proximal end of the sleeve assembly 20 in the axial direction of the sleeve assembly 20. The proximal end of the actuator assembly 30 is configured to be able to rotate within the rotation channel 25 of the sleeve assembly 20 when mounted with the sleeve assembly 20, and the movement of the proximal end of the sleeve assembly 20 in the axial direction of the sleeve assembly 20 is restricted when rotating within the rotation channel 25. For example, the blocking surface S4 and the blocking surface S5 intersect. Further, for example, the blocking surface S4 and the blocking surface S5 are perpendicular.

[0065] It should be noted that the form of the blocking part 29 is not limited to that shown in Figures 6 and 13, as long as it can achieve the purpose of blocking the proximal end of the actuator assembly 30 to rotate in the circumferential direction of the sleeve assembly 20.

[0066] As shown in Figure 6, the limiting member 606 is disposed within the rotating channel 25, and the side walls of the rotating channel 25 restrict the circumferential movement of the limiting member 606 in the sleeve assembly 20. Thus, the limiting member 606 cannot move circumferentially in the sleeve assembly 20, but can move axially in the sleeve assembly 20.

[0067] For example, as shown in FIG4, the proximal end of the actuator assembly 30 includes a mounting structure 303 having a protrusion 305, as shown in FIG5 and FIG6. The protrusion 305 is configured to be detachably mounted within the rotation channel 25. When the actuator assembly 30 is mounted to the distal end of the sleeve assembly 20, the protrusion 305 is blocked by the blocking surface S4 when it rotates within the rotation channel 25 to the blocking portion 29, and the actuator assembly 30 can no longer continue to rotate in the original direction in the circumferential direction of the sleeve assembly 20.

[0068] The unlocking and locking principle of actuator assembly 30 is achieved by the movement of the limiting member 606 in the distal or proximal direction to block or allow the protrusion 305 on actuator assembly 30 to rotate circumferentially and / or move axially within sleeve assembly 20.

[0069] For example, when the protrusion 305 reaches the rotation channel 25, its distal end is blocked, for example by the structure forming the rotation channel (e.g., the structure on the first inner tube 26), so that the actuator assembly 30 does not move distally along the axial direction of the sleeve assembly 20, thereby restricting the movement of the actuator assembly 30 in the axial direction of the sleeve assembly 20 when it rotates within the rotation channel 25.

[0070] For example, as shown in Figures 1 and 4, the proximal end of the actuator assembly 30 includes a mounting tube 31, which includes a second inner tube 3101 and a second outer tube 3102. The second outer tube 3102 is located outside the second inner tube 3101, and the proximal end of the second inner tube 3101 has a mounting structure 303. For example, as shown in Figures 6 to 8 and Figure 12, the distal end of the limiting member 606 has a locking portion S. The limiting member 606 is configured to be in a first position (as shown in Figure 12) to at least restrict the rotation of the protrusion 305 within the rotation channel 25 by means of the locking portion S, so that the actuator assembly 30 is in a locked state (as shown in Figure 12), and is configured to be in a second position (as shown in Figure 6) to give way to the protrusion 305 of the actuator assembly 30, so that the actuator assembly 30 is in an unlocked state (as shown in Figures 5 and 6).

[0071] As shown in Figures 6 to 8 and Figure 12, the locking part S can be a step, and the locking part S has a locking surface S1 and a locking surface S2. The locking surfaces S1 and S2 are shaped to fit the protrusion 305 to limit the position of the protrusion 305. The blocking surface S4, the locking surface S1, and the locking surface S2 of the blocking part 29 together limit the position of the protrusion 305 to lock the actuator assembly 30, thereby limiting the circumferential rotation of the protrusion 305 within the rotating channel 25 and its axial movement along the sleeve assembly 20.

[0072] As shown in Figure 13, the locking portion S can be a rectangular piece, including at least one locking surface S1, and the blocking portion 29 includes at least one blocking surface. The at least one locking surface S1 and the at least one blocking surface match at least two sides of the protrusion 305 to restrict the rotation of the protrusion 305 within the rotation channel. For example, the locking surface S1 and the blocking surfaces S4 and S5 of the blocking portion 29 together restrict the protrusion 305 to lock the actuator assembly 30, thereby limiting the rotation of the protrusion 305 within the rotation channel 25.

[0073] The embodiments disclosed herein use a step or rectangular piece as an example for the locking part S. However, the locking part S can also be other suitable structures that can play a locking role.

[0074] For example, as shown in Figures 5 to 8 and Figure 12, the far end of the limiting member 606 is provided with a cantilever, and the locking part S is located on the cantilever.

[0075] For example, as shown in Figures 5, 7 and 8, the locking assembly 60 also includes a spring 608, and the distal end (cantilever) of the limiting member 606 has a slot 63 extending axially along the sleeve assembly 20, the spring 608 being located within the slot 63, and the limiting member 606 being configured to return to its distal end axially along the sleeve assembly 20 under the force of the spring 608.

[0076] When installing actuator assembly 30, it needs to be aligned with the guide port of sleeve assembly 20 (see Figures 3 and 4), and then moved from the distal end to the proximal end. When the proximal end of actuator assembly 30 is fully fitted with sleeve assembly 20 along the axial direction, it indicates that actuator assembly 30 has been installed in place. At this time, actuator assembly 30 is not locked and still has the freedom of axial movement. In order to ensure a rigid connection between actuator assembly 30 and sleeve assembly 20, actuator assembly 30 needs to be rotated counterclockwise so that the protrusion 305 of actuator assembly 30 enters the rotation channel 25 (e.g., groove) of the first inner tube 26 (sleeve inner core). At this time, the movement of actuator assembly 30 relative to sleeve assembly 20 in the distal direction (axial direction of sleeve assembly 20) is locked. At this time, the actuator assembly 30 is unlocked or locked by the limiting member 606 that moves axially in the sleeve assembly 20. When the limiting member 606 is in the zero position (i.e., the limiting member 606 is installed in place), the locking part S of the limiting member 606 stops at least one side of the protrusion 305 of the actuator assembly 30, so that the actuator assembly 30 cannot rotate circumferentially and / or move axially. That is, the protrusion 305 on the actuator assembly 30 cannot come out from the rotation channel 25 (e.g., groove) of the first inner tube 26 (sleeve inner core), thereby achieving the effect of locking the actuator assembly 30.

[0077] The actuator assembly 30 can be unlocked by rotating the connecting member 70, which in turn drives the limiting member 606. At this time, the limiting member 606 needs to be moved to the proximal end so that the locking part S of the limiting member 606 is away from the protrusion 305 of the actuator assembly 30. Then, rotating the actuator assembly 30 clockwise can make the protrusion 305 of the actuator assembly 30 come out of the rotation channel 25 (e.g., groove) of the first inner tube 26 (sleeve inner core). Then, the actuator assembly 30 can be moved to the distal end relative to the sleeve assembly 20 to unlock the actuator assembly 30.

[0078] The medical device provided in the embodiments of this disclosure uses a method of screwing in counterclockwise and screwing out clockwise for the actuator assembly 30. However, the embodiments of this disclosure include, but are not limited to, this. When adjusting the position and structure of the limiting member 606, a method of screwing in clockwise and screwing out counterclockwise for the actuator assembly 30 can also be used. In the embodiments of this disclosure, the arrow in FIG11 indicates counterclockwise rotation; that is, with the handle assembly 10 closer to the operator and the actuator assembly 30 further away from the operator, turning left is counterclockwise, and turning right is clockwise. The direction shown in FIG11 can be a first direction, and the direction opposite to the first direction is a second direction.

[0079] The medical device provided in the embodiments of this disclosure controls the movement of the limiting member 606 in the distal or proximal direction by the rotation of the operating member 50 located at the proximal end of the cannula assembly 20, thereby achieving locking and unlocking of the actuator assembly 30 and the cannula assembly 20.

[0080] When the actuator assembly 30 is locked, the limiting member 606 is in the zero position under the action of the spring 608, that is, it prevents the protrusion 305 of the actuator assembly 30 from rotating out of the rotation channel 25 (e.g., groove) of the first inner tube 26 (sleeve inner core).

[0081] The actuator assembly 30 can be unlocked by rotating the operating member 50. When the operating member 50 is rotated, the turntable 71 is rotated, and the drive shaft 77 of the turntable 71 slides within the sliding hole 736 of the connector 73, causing the connector 73 to move proximally within the frame of the housing 21. The connector 73 drives the limiting member 606 to move proximally, and the locking portion S of the cantilever at the front end of the limiting member 606 yields to the protrusion 305 of the actuator assembly 30, thereby enabling the actuator assembly 30 to be rotated in the second direction (the opposite direction of the first direction) to unlock. After the actuator assembly 30 is disassembled, the operating member 50 is released, and the limiting member 606 is reset by the action of the spring 608, returning to its initial state.

[0082] As shown in Figure 11, the medical device also includes a handle assembly 10. A cannula assembly 20 is detachably mounted to the handle assembly 10. The handle assembly 10 is detachably connected to the proximal end of the cannula assembly 20. For example, the handle assembly 10 includes a disposable protective shell.

[0083] For example, actuator assembly 30 may be a single-use actuator assembly 30. That is, actuator assembly 30 may be a single-use loading unit (sulu unit), but is not limited to this. Multiple different types of actuator assemblies 30 may be used in conjunction with cannula assembly 20 to meet different surgical needs.

[0084] For example, as shown in Figure 1, actuator assembly 30 includes jaw assembly 32. Before use, actuator assembly 30 is selectively connected to the distal end of sleeve assembly 20, which is connected to handle assembly 10 (including power unit). After use, actuator assembly 30 is disconnected from reusable sleeve assembly 20 and handle assembly 10 so that it can be disposed of or, in some cases, sterilized for reuse.

[0085] For example, in some embodiments, the medical device may be a stapler, such as a laparoscopic stapler; in this case, as shown in FIG1, the actuator assembly 30 may include a jaw assembly 32, which includes a first jaw and a second jaw that can be controlled to open or close. For example, one of the first jaw and the second jaw includes a staple cartridge, and the other includes an anvil capable of deforming staples ejected from the staple cartridge. For example, in other embodiments, the medical device may also be other suitable medical devices such as a clamp applicator; the embodiments of this disclosure do not specifically limit the type of medical device.

[0086] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A medical device comprising: A cannula assembly, including a cannula portion and a housing disposed near the proximal end of the cannula portion; An actuator assembly is detachably connected to the distal end of the sleeve assembly and is configured to be rotatable about the axis of the sleeve assembly when connected to the sleeve assembly; as well as The locking assembly includes interconnected limiting elements and operating elements, wherein, The limiting member is configured to move along the axial direction of the sleeve assembly to restrict the rotational movement of the actuator assembly. The operating element is configured to be rotatable to drive the limiting element to move axially in the sleeve assembly.

2. The medical device according to claim 1, wherein, The locking assembly further includes a force conversion assembly located within the housing, and the operating member is at least partially disposed on the outside of the housing. The force conversion assembly is configured to convert the rotational motion of the operating member into axial movement of the limiting member.

3. The medical device according to claim 2, wherein, The proximal end of the limiting member has a first mating portion, and the force conversion assembly includes a connector, the connector having a second mating portion, the first mating portion and the second mating portion being mated and connected.

4. The medical device according to claim 3, wherein, One of the first mating portion and the second mating portion includes a protrusion, and the other of the first mating portion and the second mating portion includes a groove that matches the protrusion.

5. The medical device according to any one of claims 2-4, wherein, The force conversion assembly also includes a turntable, and the operating element is connected to the connecting element via the turntable.

6. The medical device according to claim 5, wherein, The operating element has a rotating shaft, the turntable has a through hole for receiving the rotating shaft, the rotating shaft matches the through hole, and the operating element is configured to drive the turntable to rotate.

7. The medical device according to claim 6, wherein, The operating component also has at least one positioning protrusion structure arranged around the rotating shaft, and the turntable has at least one positioning groove structure that matches the positioning protrusion structure, so that the operating component is relatively fixed to the turntable, thereby driving the turntable to rotate.

8. The medical device according to any one of claims 5-7, wherein, The turntable has an eccentrically arranged drive shaft, the connector has a sliding hole extending radially along the sleeve assembly, the drive shaft is disposed in the sliding hole, and the operating member is configured to drive the turntable to rotate, thereby driving the drive shaft to move within the sliding hole, so as to drive the connector to move axially along the sleeve assembly, and thereby drive the limiting member to move.

9. The medical device according to claim 6 or 7, wherein, The force conversion assembly further includes a retaining ring configured to fix the operating member to the turntable, thereby restricting the movement of the operating member in the extension direction of the rotating shaft.

10. The medical device according to claim 6, 7 or 9, wherein, The housing has a receiving groove, the operating member is disposed in the receiving groove, the receiving groove has a bottom surface, the bottom surface has a rotating shaft hole, and the rotating shaft of the operating member is connected to the force conversion assembly through the rotating shaft hole.

11. The medical device according to any one of claims 1-10, wherein, The sleeve assembly includes a first inner tube and a first outer tube, the first inner tube being located inside the first outer tube. The distal end of the first inner tube has a blocking portion and a rotation channel. The blocking portion is configured to block circumferential rotation of the actuator assembly. The proximal end of the actuator assembly is configured to rotate circumferentially within the rotation channel of the sleeve assembly when connected to the sleeve assembly, and its axial movement within the sleeve assembly is restricted when rotating within the rotation channel.

12. The medical device according to claim 11, wherein, The proximal end of the actuator assembly includes a mounting structure having a protrusion configured to be detachably mounted within the rotary channel.

13. The medical device according to claim 12, wherein, The proximal end of the actuator assembly includes a mounting tube, which includes a second inner tube and a second outer tube, the second outer tube being located outside the second inner tube, and the proximal end of the second inner tube having the mounting structure.

14. The medical device according to claim 12 or 13, wherein, The distal end of the limiting member has a locking portion. The limiting member is configured in a first position to at least restrict the rotation of the protrusion within the rotation channel by means of the locking portion, so that the actuator assembly is in a locked state, and is configured in a second position to give way to the protrusion of the actuator assembly so that the actuator assembly is in an unlocked state.

15. The medical device according to claim 14, wherein, The locking portion includes at least one locking surface, and the blocking portion includes at least one blocking surface. The at least one locking surface and the at least one blocking surface match at least two sides of the protrusion to restrict the rotation of the protrusion within the rotation channel.

16. The medical device according to claim 14 or 15, wherein, The distal end of the limiting member is provided with a cantilever, and the locking part is located on the cantilever.

17. The medical device according to claim 16, wherein, The locking assembly further includes a spring, the cantilever has a slot extending axially along the sleeve assembly, the spring is located within the slot, and the limiting member is configured to return to its distal end axially along the sleeve assembly under the action of the spring force.

18. The medical device according to any one of claims 1-17, wherein, The medical device is a stapler.

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