Flow control device

Abstract

The invention relates to a flow control device capable of adjusting the flow of fluid in a connecting pipe. The sleeve is coaxially arranged in the outer cylinder, an inner cavity of the sleeve penetrates in the axial direction to contain the connecting pipe, and a containing groove communicated with the inner cavity is formed in the outer wall of the sleeve; the locking piece is contained in the containing groove, can move in the radial direction of the sleeve and partially enters an inner cavity of the sleeve; the sheath can be movably arranged on the sleeve in the axial direction of the sleeve, the sheath is provided with an operation part extending out of the outer cylinder, the sheath is provided with a first position for pressing the locking piece and a second position for pressing the locking piece, and when the sheath is located at the first position and the second position, the locking piece can be locked in the first position and the second position. The degrees of the locking piece entering the inner cavity of the sleeve are different, and the degrees of the locking piece extruding the connecting pipe are different; and the elastic piece is arranged between the sheath and the outer cylinder and can drive the sheath to move from the second position to the first position.

Description

Technical Field

[0001] The present application relates to the technical field of flow regulation, and in particular to a flow control device. Background Art

[0002] The peripheral thrombectomy device includes a thrombectomy catheter, a connecting tube and a host. During the thrombectomy process, the flow rate of the connecting tube needs to be controlled. Summary of the invention

[0003] Based on this, it is necessary to propose a flow control device that can control the flow of the connecting pipe.

[0004] According to one aspect of the present application, a flow control device includes: an outer cylinder; a sleeve coaxially arranged in the outer cylinder, the inner cavity of the sleeve is axially penetrated to accommodate a connecting pipe, and the outer wall of the sleeve is provided with a receiving groove connected to the inner cavity; a locking member is accommodated in the receiving groove and can move along the radial direction of the sleeve and partially enter the inner cavity of the sleeve; a sleeve is movably arranged on the sleeve along the axial direction of the sleeve, the sleeve has an operating portion extending out of the outer cylinder, the sleeve has a first position for pressing the locking member, and a second position for pressing the locking member, when the sleeve is in the first position and the second position, the degree to which the locking member enters the inner cavity of the sleeve is different, and the degree to which the locking member squeezes the connecting pipe is different; and an elastic member is arranged between the sleeve and the outer cylinder, and can drive the sleeve to move from the second position to the first position.

[0005] In some embodiments, the outer tube is provided with a first channel and a second channel in sequence along the axial direction, the first channel and the second channel are connected in the axial direction of the outer tube, the operating part is configured to be slidably assembled in the first channel to selectively engage in the first channel or the second channel, when the operating part is engaged in the first channel, the sheath is in a first position, and when the operating part is engaged in the second channel, the sheath is in a second position.

[0006] In some embodiments, the locking element is provided on at least one side of the sleeve.

[0007] In some embodiments, the receiving groove extends a certain length along the axial direction to form a groove, one end of the groove in the axial direction is connected to an elastic cantilever, and the locking member is disposed at a free end of the elastic cantilever.

[0008] In some embodiments, the inner wall of the sheath is provided with a compression surface and a release surface, and the inner diameter of the sheath at the compression surface is smaller than the inner diameter of the release surface.

[0009] In some embodiments, a first boss, a second boss, a third boss and a fourth boss are provided on the inner wall of the sleeve, wherein the first boss and the second boss are symmetrically arranged with respect to the axis of the sleeve, the third boss and the fourth boss are symmetrically arranged, the first boss and the second boss jointly define the clamping surface, and the third boss and the fourth boss jointly define the release surface.

[0010] In some embodiments, the sleeve is fixed in the outer cylinder.

[0011] In some embodiments, in the axial direction, both ends of the sleeve are in abutment with the outer cylinder, and in the circumferential direction, the sleeve is snap-fitted with the outer cylinder.

[0012] In some embodiments, the outer tube includes an upper cover and a lower cover connected by a snap-fit ​​connection, and the distal end and the proximal end of the outer tube respectively form a first retaining wall with a first through hole and a second retaining wall with a first through hole; the distal end of the upper cover is provided with a part of the first retaining wall, and the distal end of the lower cover is provided with another part of the first retaining wall; the proximal end of the upper cover is provided with a part of the second retaining wall, and the proximal end of the lower cover is provided with another part of the second retaining wall; the distal end of the sleeve abuts against the first retaining wall, and the proximal end of the sleeve abuts against the second retaining wall; the inner walls of the first through hole and the second through hole are respectively provided with clamping blocks, and the distal end and the proximal end of the sleeve are respectively provided with matching axial retaining grooves.

[0013] In some embodiments, the first retaining wall and the second retaining wall are respectively provided with a first annular protrusion and a second annular protrusion; in the axial direction, the distal end of the sleeve is inserted into the first annular protrusion, and the proximal end of the sleeve is inserted into the second annular protrusion; the elastic member is sleeved on the sleeve, and the two ends of the elastic member respectively abut against the first annular protrusion and the sleeve.

[0014] When the flow control device of the present application is used, the connecting tube passes through the sleeve, and the two ends of the connecting tube extend out of the proximal end and the distal end of the outer tube respectively. The user manipulates the operating part to move the sheath from the first position to the second position, and during this process, the elastic member continuously stores energy. When the sheath moves to the second position, the sheath presses the locking member and reduces the cross-sectional area of ​​the flow channel of the connecting tube, thereby achieving flow control. In addition, in the present application, the sleeve can be directly sleeved on the connecting tube to avoid other connection methods such as gluing or Luer connection, and the position of the flow control device can be changed according to the operator's preference, which is convenient for operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is a schematic structural diagram of a flow control device according to an embodiment of the present application, wherein the sheath is in a first position.

[0016] FIG2 is a schematic diagram of the structure of the flow control device of an embodiment of the present application after the lower cover is hidden, wherein the sheath is in the first position.

[0017] FIG. 3 is a front view of the flow control device shown in FIG. 1 .

[0018] FIG. 4 is a cross-sectional view taken along line AA in FIG. 3 .

[0019] FIG. 5 is a cross-sectional view taken along line BB in FIG. 3 .

[0020] FIG6 is a schematic structural diagram of the flow control device according to an embodiment of the present application, wherein the sheath is in the second position.

[0021] FIG. 7 is a front view of the flow control device shown in FIG. 6 .

[0022] FIG8 is a cross-sectional view taken along the CC line in FIG7 .

[0023] FIG. 9 is a schematic diagram of the structure of a sheath in a flow control device according to an embodiment of the present application.

[0024] FIG. 10 is a side view of the sheath shown in FIG. 9 .

[0025] FIG. 11 is a schematic structural diagram of another embodiment of the sleeve in the flow control device of the embodiment of the present application.

[0026] FIG. 12 is a top view of the sleeve of FIG. 11 .

[0027] FIG. 13 is a cross-sectional view taken along line DD in FIG. 12 .

[0028] Reference numerals:

[0029] 100, flow control device; 10, outer cylinder; 101, first channel; 102, second channel; 110, upper cover; 120, lower cover; 130, first retaining wall; 131, first through hole; 132, first annular protrusion; 140, second retaining wall; 141, second through hole; 142, second annular protrusion; 150, clamping block; 160, first arc-shaped protrusion; 170, second arc-shaped protrusion; 20, sleeve; 210, receiving groove; 220, axial clamping groove; 230, elastic cantilever; 30, locking member; 40, sheath; 410, sleeve body; 420, operating part; 411, pressing surface; 412, releasing surface; 413, inclined surface; 414, first boss; 415, second boss; 416, third boss; 417, fourth boss; 50, elastic member. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0032] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] The present application provides a flow control device 100, which can be used to control the flow of a connecting tube (not shown) in a peripheral thrombectomy device. It should be noted that the connecting tube of the flow control device 100 of the present application is not limited to the connecting tube in the peripheral thrombectomy device.

[0034] As shown in FIGS. 1 to 5 , the flow control device 100 provided in the embodiment of the present application includes an outer cylinder 10, a sleeve 20, a locking member 30, a sheath 40 and an elastic member 50. The sleeve 20 is coaxially arranged in the outer cylinder 10, the inner cavity of the sleeve 20 is axially penetrated to accommodate the connecting pipe, and a receiving groove 210 communicating with the inner cavity is provided on the outer wall of the sleeve 20. The locking member 30 is accommodated in the receiving groove 210 and can move along the radial direction of the sleeve 20 and partially enter the inner cavity of the sleeve 20. The sheath 40 is disposed on the sleeve 20 so as to be movable along the axial direction of the sleeve 20. The sheath 40 has an operating portion 420 extending out of the outer tube 10. The sheath 40 has a first position (see FIGS. 1 and 4 ) for pressing the locking member 30 and a second position (see FIGS. 6 and 8 ) for pressing the locking member 30. When the sheath 40 is in the first position, the locking member 30 enters the inner cavity of the sleeve 20 to different degrees, and the locking member 30 squeezes the connecting tube to different degrees. The elastic member 50 is disposed between the sheath 40 and the outer tube 10, and can drive the sheath 40 to move from the second position to the first position.

[0035] In the present application, the axial direction refers to the extension direction of the axis of the sleeve 20. For the convenience of description, in the axial direction, the two ends of the sleeve 20 are respectively defined as the proximal end (the right end in FIG. 1 ) and the distal end (the left end in FIG. 1 ) of the sleeve 20, and the distal end is close to the patient. Similarly, the two ends of the outer tube 10 are respectively defined as the proximal end (the right end in FIG. 1 ) and the distal end (the left end in FIG. 1 ) of the outer tube 10.

[0036] The outer cylinder 10 is used to accommodate the sleeve 20, and the inner cavity of the outer cylinder 10 axially penetrates the proximal end and the distal end of the outer cylinder 10, so that the connecting pipe can pass through it. The shape of the outer cylinder 10 is not limited. Optionally, the outer cylinder 10 is a two-piece type, including an upper cover 110 and a lower cover 120, and the upper cover 110 and the lower cover 120 are connected and snapped to form the outer cylinder 10. Optionally, the outer cylinder 10 is a multi-piece type, including a plurality of assemblies that are evenly distributed in the circumferential direction and snapped with each other. Optionally, the outer cylinder 10 includes a main cylinder part and an end cover, and the sleeve 20 and other components can be inserted into the main cylinder part from one end of the main cylinder part, and then fixed with the end cover.

[0037] The sleeve 20 is used to receive the connecting pipe. The receiving groove 210 penetrates the wall of the sleeve 20 along the radial direction of the sleeve 20, thereby connecting the inner cavity of the sleeve 20 with the external space.

[0038] The locking member 30 is configured to be movable in the receiving groove 210 along the radial direction of the sleeve 20 so as to partially enter the inner cavity of the sleeve 20. The size and shape of the locking member 30 are not limited, as long as it can move in the receiving groove 210.

[0039] The sheath 40 is movably disposed on the sleeve 20 along the axial direction of the sleeve 20. The sheath 40 includes a sleeve body 410 and an operating portion 420, and the sleeve body 410 is sleeved on the sleeve 20. The operating portion 420 of the sheath 40 extends out of the outer cylinder 10 for the user to manipulate the movement of the sheath 40. In the axial direction, as shown in FIGS. 1, 2 and 4, the sheath 40 has a first position; as shown in FIGS. 6 to 8, the sleeve 20 also has a second position. In the present application, when the sheath 40 is in the first position, the locking member 30 enters the inner cavity of the sleeve 20 to different degrees, and the locking member 30 squeezes the connecting tube to different degrees.

[0040] Specifically, when the sheath 40 is in the first position, the sheath 40 has a greater degree of compression on the locking member 30 in the radial direction of the sleeve 20, so that the bottom of the locking member 30 invades the inner cavity of the sleeve 20 and squeezes the connecting pipe, thereby changing the cross-sectional area of ​​the flow passage of the connecting pipe, and realizing the flow control of the fluid in the connecting pipe. When the sheath 40 is in the second position, the degree of compression of the sheath 40 on the locking member 30 is weakened, so that the cross-sectional area of ​​the flow passage of the connecting pipe is increased, and the flow capacity is increased.

[0041] Optionally, when the sheath 40 is in the first position, the sheath 40 can be set to press the locking member 30 and make the connecting pipe in an interrupted state, that is, close the connecting pipe. Optionally, when the sheath 40 is in the first position, the sheath 40 can also be set to press the locking member 30 and make the connecting pipe in a state where the flow capacity is reduced but not closed.

[0042] Optionally, when the sheath 40 is in the second position, in the radial direction of the sleeve 20, the sheath 40 releases the locking member 30, that is, the locking member 30 is no longer pressed, the locking member 30 no longer squeezes the connecting pipe, and has no ability to change the flow cross-sectional area of ​​the connecting pipe, and the connecting pipe is in a fully open state. Optionally, when the sheath 40 is in the second position, the locking member 30 still squeezes the connecting pipe but the squeezing degree is weakened, and the flow capacity of the connecting pipe is increased but not fully opened.

[0043] When the sheath 40 is at the second position, an external force may be applied to keep the sheath 40 at the second position, or the sheath 40 may be fixed to the outer tube 10 or the sleeve 20 to keep the sheath at the second position.

[0044] The elastic member 50 is disposed between the sheath 40 and the outer tube 10. The elastic member 50 is used to provide elastic force so that the initial position of the sheath 40 is maintained at the first position. In the present application, the elastic member 50 is specifically disposed between the distal end of the sheath 40 and the distal end of the outer tube 10, and the elastic member 50 provides a thrust acting on the sheath 40 to keep the sheath 40 in the first position. In other embodiments, the elastic member 50 may be disposed between the proximal end of the sheath 40 and the proximal end of the outer tube 10, and the elastic member 50 provides a pulling force acting on the sheath 40 to keep the sheath 40 in the first position. Optionally, the elastic member 50 is a spring.

[0045] When the flow control device 100 of the present application is used, the connecting tube passes through the sleeve 20, and the two ends of the connecting tube extend out of the proximal end and the distal end of the outer tube 10 respectively. The user manipulates the operating part 420 to move the sheath 40 from the first position to the second position, and during this process, the elastic member 50 continuously stores energy. When the sheath 40 moves to the second position, the sheath 40 presses the locking member 30 and reduces the cross-sectional area of ​​the flow passage of the connecting tube, thereby achieving flow control.

[0046] In addition, in the present application, the sleeve 20 can be directly mounted on the connecting tube to avoid other connection methods such as gluing or Luer connection, and the position of the flow control device 100 can be changed according to the operator's preference for easy operation.

[0047] In some embodiments, as shown in Figures 1 and 6, the outer cylinder 10 is axially provided with a first channel 101 and a second channel 102 in sequence, and the first channel 101 and the second channel 102 are connected in the axial direction of the outer cylinder 10. The operating part 420 is configured to be slidably assembled in the first channel 101 to selectively clamp in the first channel 101 or the second channel 102. When the operating part 420 is clamped in the first channel 101, the sheath 40 is in the first position, and when the operating part 420 is clamped in the second channel 102, the sheath 40 is in the second position.

[0048] In the present application, as shown in FIG1 , the outer cylinder 10 includes an upper cover 110 and a lower cover 120 connected by snap-fit. The outer wall of the upper cover 110 is provided with an L-shaped slot along the axial direction, and the lower cover 120 is provided with a linear slot. After the upper cover 110 and the lower cover 120 are butt-jointed, the L-shaped slot and the linear slot are spliced ​​into a first channel 101 and a second channel 102. As shown in FIG1 and FIG2 , the second channel 102 is connected to the distal end of the first channel 101, and the second channel 102 is closer to the distal end of the outer cylinder 10.

[0049] As shown in Fig. 2 and Fig. 4, when the sheath 40 is in the first position, the operating portion 420 abuts against the inner wall of the proximal end of the first channel 101 under the elastic force of the elastic member 50. The operating portion 420 moves along the first channel 101 until it abuts against the inner wall of the proximal end of the second channel 102, and the sheath 40 moves to its second position, as shown in Fig. 6 and Fig. 8. At this time, under the elastic force of the elastic member 50, the operating portion 420 abuts tightly against the inner wall of the proximal end of the second channel 102, so that the sheath 40 remains in the second position, thereby stabilizing the flow rate of the fluid in the connecting tube.

[0050] In some embodiments, a locking member 30 is disposed on at least one side of the sleeve 20 .

[0051] As shown in Fig. 4, locking members 30 are provided on both sides of the sleeve 20, and the two locking members 30 are symmetrically arranged about the axis of the sleeve 20. When the sheath 40 is in the first position, the sheath 40 simultaneously presses the two locking members 30, so that the two locking members 30 squeeze the connecting pipe at the same time, thereby quickly achieving the purpose of reducing the flow capacity of the connecting pipe.

[0052] In some embodiments, the locking member 30 is a sphere or a cylinder. When the locking member 30 is a sphere, when the sheath 40 moves axially, the sheath 40 and the locking member 30 can slide relatively smoothly. When the locking member 30 is a cylinder, the top of the locking member 30 can be set to be an arc surface, and when the sheath 40 moves from the second position to the first position, the sheath 40 can smoothly move to the top of the locking member 30, and then press the locking member 30.

[0053] In some embodiments, as shown in FIG4 , the inner wall of the sheath 40 is provided with a pressing surface 411 and a releasing surface 412, and the inner diameter of the sheath 40 at the pressing surface 411 is smaller than the inner diameter of the releasing surface 412. When the sheath 40 is in the first position, the pressing surface 411 is located above the top end of the locking member 30 and presses the locking member 30. As shown in FIG8 , when the sheath 40 is in the second position, the releasing surface 412 is located above the top end of the locking member 30. The degree of pressing of the locking member 30 by the releasing surface 412 is smaller than the degree of pressing of the pressing surface 411.

[0054] In this embodiment, the purpose of different compression degrees of the locking member 30 can be achieved by changing the inner diameter of the sheath 40 , and the design is simple and reliable.

[0055] Further, as shown in Fig. 4, the pressing surface 411 and the releasing surface 412 are transitionally connected by an inclined surface 413. In this way, when the sheath 40 switches between the first position and the second position, the pressing surface 411 can smoothly transition to being above the top end of the locking member 30 and the releasing surface 412 being above the top end of the locking member 30.

[0056] Optionally, as shown in Figures 4, 9 and 10, a first boss 414, a second boss 415, a third boss 416 and a fourth boss 417 are provided on the inner wall of the sleeve 40, wherein the first boss 414 and the second boss 415 are symmetrically arranged with respect to the axis of the sleeve 40, the third boss 416 and the fourth boss 417 are symmetrically arranged, the first boss 414 and the second boss 415 jointly define the clamping surface 411, and the third boss 416 and the fourth boss 417 jointly define the release surface 412.

[0057] The first boss 414 and the second boss 415 face each other in the radial direction of the sheath 40, and the third boss 416 and the fourth boss 417 face each other in the radial direction of the sheath 40. In the radial direction of the sheath 40, the distance between the first boss 414 and the second boss 415 is smaller than the distance between the third boss 416 and the fourth boss 417, the top surface of the first boss 414 and the top surface of the second boss 415 together constitute the pressing surface 411, and the top surface of the third boss 416 and the top surface of the fourth boss 417 together constitute the releasing surface 412. The first boss 414 and the second boss 415 are closer to the distal end of the sheath 40 than the third boss 416 and the fourth boss 417.

[0058] In this embodiment, the pressing surface 411 and the releasing surface 412 are formed by providing a plurality of bosses on the inner wall of the sheath 40 ; the plurality of bosses also serve as reinforcing ribs to improve the strength of the sheath 40 .

[0059] In some embodiments, the sleeve 20 is fixed in the outer tube 10. By fixing the sleeve 20 in the outer tube 10, when the connecting pipe is inserted into the sleeve 20, the relative position of the connecting pipe and the sleeve 20 is also stable, so that the effect of stably changing the flow capacity of the connecting pipe can be achieved.

[0060] In this embodiment, in the axial direction, both ends of the sleeve 20 abut against the outer cylinder 10 , and in the circumferential direction, the sleeve 20 and the outer cylinder 10 are snap-fitted.

[0061] Specifically, as shown in FIG. 2 and FIG. 4 , the outer cylinder 10 includes an upper cover 110 and a lower cover 120 connected by snap-fit. After the upper cover 110 and the lower cover 120 are butted, the distal end and the proximal end of the outer cylinder 10 form a first retaining wall 130 having a first through hole 131 and a second retaining wall 140 having a first through hole 131, respectively. The distal end of the upper cover 110 is provided with a portion of the first retaining wall 130, and the distal end of the lower cover 120 is provided with another portion of the first retaining wall 130; the proximal end of the upper cover 110 is provided with a portion of the second retaining wall 140, and the proximal end of the lower cover 120 is provided with another portion of the second retaining wall 140. The distal end of the sleeve 20 abuts against the first retaining wall 130, and the proximal end of the sleeve 20 abuts against the second retaining wall 140.

[0062] The inner walls of the first through hole 131 and the second through hole 141 are respectively provided with a clamping block 150, and the distal end and the proximal end of the sleeve 20 are respectively provided with a matching axial clamping groove 220. After the sleeve 20 is installed in the outer cylinder 10, the axial clamping grooves 220 at both ends of the sleeve 20 are respectively matched with the clamping blocks 150 at both ends of the outer cylinder 10, and the circumferential movement of the sleeve 20 is limited.

[0063] Further, as shown in FIG2 , a first annular protrusion 132 and a second annular protrusion 142 are respectively provided on the first retaining wall 130 and the second retaining wall 140. In the axial direction, the distal end of the sleeve 20 is inserted into the first annular protrusion 132, and the proximal end of the sleeve 20 is inserted into the second annular protrusion 142; the elastic member 50 is sleeved on the sleeve 20, and the two ends of the elastic member 50 are respectively against the first annular protrusion 132 and the sleeve 40. The first annular protrusion 132 and the second annular protrusion 142 play the role of guiding the installation of the sleeve 20 and positioning the sleeve 20.

[0064] Further, as shown in Fig. 2 and Fig. 4, the inner wall of the upper cover 110 is provided with a first arc-shaped protrusion 160 extending in the axial direction, and the inner wall of the lower cover 120 is provided with a second arc-shaped protrusion 170 extending in the axial direction. The first arc-shaped protrusion 160 and the second arc-shaped protrusion 170 are located on both sides of the sheath 40 and contact the outer cylindrical wall surface of the sheath 40. Therefore, the sheath 40 can slide more stably along the two protrusions.

[0065] As shown in Figures 11 to 13, in other embodiments, the receiving groove 210 on the outer wall of the sleeve 20 extends a certain length in the axial direction and forms a groove, and an elastic cantilever 230 is connected to one end of the groove in the axial direction, and the locking member 30 is arranged at the free end of the elastic cantilever 230.

[0066] The inner wall of the proximal end of the groove is connected to the elastic cantilever 230. The locking member 30 is arranged at the distal end of the elastic cantilever 230. In the radial direction of the sleeve 20, the top end of the locking member 30 protrudes from the elastic cantilever 230. In this way, when the sheath 40 is in the first position, the pressing surface 411 of the sheath 40 can press the locking member 30, and make the elastic cantilever 230 rotate downward with the proximal end of the elastic cantilever 230 as a fulcrum, so that the locking member 30 can squeeze the connecting pipe in the sleeve 20.

[0067] Furthermore, in the radial direction of the sleeve 20, the bottom end of the locking member 30 protrudes an elastic cantilever 230. When the sheath 40 presses the locking member 30, the bottom end of the elastic cantilever 230 can abut against the connecting pipe when the elastic cantilever 230 is within a relatively small rotation range. In this way, the elastic cantilever 230 is not easily broken, and the locking member 30 can quickly squeeze the connecting pipe.

[0068] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0069] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0070] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0071] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A flow control device, characterized in that: include: outer cylinder; A sleeve is coaxially disposed in the outer sleeve, the inner cavity of the sleeve is axially penetrated to accommodate the connecting pipe, and a receiving groove communicating with the inner cavity is provided on the outer wall of the sleeve; A locking member, received in the receiving groove and capable of moving in the radial direction of the sleeve and partially entering the inner cavity of the sleeve; a sheath, which is movably disposed on the sleeve along the axial direction of the sleeve, the sheath having an operating portion extending out of the outer sleeve, the sheath having a first position for pressing the locking member, and a second position for pressing the locking member, when the sheath is at the first position and the second position, the locking member enters the inner cavity of the sleeve to different degrees, and the locking member squeezes the connecting tube to different degrees; and The elastic member is disposed between the sheath and the outer tube, and can drive the sheath to move from the second position to the first position.

2. The flow control device according to claim 1, characterized in that: The outer tube is provided with a first channel and a second channel in sequence along the axial direction, the first channel and the second channel are connected in the axial direction of the outer tube, the operating part is configured to be slidably assembled in the first channel to selectively clamp in the first channel or the second channel, when the operating part is clamped in the first channel, the sheath is in the first position, and when the operating part is clamped in the second channel, the sheath is in the second position.

3. The flow control device according to claim 1, characterized in that: The locking element is disposed on at least one side of the sleeve.

4. The flow control device according to claim 1, characterized in that: The receiving groove extends along the axial direction for a certain length to form a groove, one end of the groove in the axial direction is connected to an elastic cantilever, and the locking member is arranged at the free end of the elastic cantilever.

5. The flow control device according to claim 1, characterized in that: The inner wall of the sleeve is provided with a compression surface and a release surface, and the inner diameter of the sleeve at the compression surface is smaller than the inner diameter of the release surface.

6. The flow control device according to claim 5, characterized in that: A first boss, a second boss, a third boss and a fourth boss are provided on the inner wall of the sleeve, wherein the first boss and the second boss are symmetrically arranged with respect to the axis of the sleeve, the third boss and the fourth boss are symmetrically arranged, the first boss and the second boss jointly define the clamping surface, and the third boss and the fourth boss jointly define the release surface.

7. The flow control device according to claim 1, characterized in that: The sleeve is fixed in the outer cylinder.

8. The flow control device according to claim 7, characterized in that: In the axial direction, both ends of the sleeve are in contact with the outer cylinder, and in the circumferential direction, the sleeve is snap-fitted with the outer cylinder.

9. The flow control device according to claim 7, characterized in that: The outer cylinder comprises an upper cover and a lower cover connected by snap-fit ​​connection, and the distal end and the proximal end of the outer cylinder respectively form a first retaining wall with a first through hole and a second retaining wall with the first through hole; a part of the first retaining wall is provided at the distal end of the upper cover, and another part of the first retaining wall is provided at the distal end of the lower cover; a part of the second retaining wall is provided at the proximal end of the upper cover, and another part of the second retaining wall is provided at the proximal end of the lower cover; the distal end of the sleeve abuts against the first retaining wall, and the proximal end of the sleeve abuts against the second retaining wall; the inner walls of the first through hole and the second through hole are respectively provided with clamping blocks, and the distal end and the proximal end of the sleeve are respectively provided with matching axial retaining grooves.

10. The flow control device according to claim 9, characterized in that: The first retaining wall and the second retaining wall are respectively provided with a first annular protrusion and a second annular protrusion; in the axial direction, the distal end of the sleeve is inserted into the first annular protrusion, and the proximal end of the sleeve is inserted into the second annular protrusion; the elastic member is sleeved on the sleeve, and the two ends of the elastic member respectively abut against the first annular protrusion and the sleeve.

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