Adjustable curved suction catheter, suction device and operating handle

Abstract

The present invention provides an adjustable bend suction catheter, a suction device and an operating handle, which relate to the field of medical devices. The adjustable bend suction catheter includes a tube structure, a traction member and an embedded bracket; the distal end of the traction member is fixed to the distal end of the tube structure, and the traction member is pulled toward the proximal direction, so that the distal end of the tube structure can be pulled to bend toward the side of the pulled traction member; the embedded bracket is embedded and connected to the distal end of the tube structure, including a plurality of wavy bracket rings arranged at intervals in the axial direction, and a plurality of connecting ribs are arranged and connected circumferentially at intervals between adjacent wavy bracket rings, and all the connecting ribs are arranged in the same direction of spiral around the central axis of the wavy bracket ring. The suction device includes the aforementioned adjustable bend suction catheter. The present invention solves the technical problem in the prior art that the suction catheter cannot be designed into an autonomous bending structure because it cannot take into account both flexibility and radial support force.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an adjustable suction catheter, a suction device and an operating handle. Background Art

[0002] In the prior art, the suction of arteriovenous thrombi is mainly accomplished by suction catheters. However, during the suction process, under the action of a large suction force, the distal end of the suction catheter is easily flattened under negative pressure, resulting in the termination of the operation. Currently, this problem is avoided by embedding a stent in the distal end of the suction catheter. Since the stents mainly include mesh stents and spiral stents, and the radial support force of spiral stents is relatively low, mesh stents are currently used for embedded stents. However, although the mesh stent can solve the above-mentioned problem of avoiding flattening, as the radial support force of the distal end of the suction catheter is increased, the hardness of the distal end of the suction catheter is increased, making the distal end of the suction catheter unable to bend, making it difficult to pass through the tortuous blood vessels to reach the target suction site, and it is also impossible to directly connect the bending wire to control the bending of the distal end, so:

[0003] (1) For surgeries where the suction catheter needs to pass through curved blood vessels to reach the target thrombus suction site, the suction catheter can only be delivered and withdrawn with the help of another layer of bending sheath. The outer bending sheath is used to constrain the suction catheter to form an overall curvature to help the suction catheter pass through the bend, which is complicated to operate. In addition, the diameter of the additional sheath is larger, making it more difficult to pass through blood vessels with smaller diameters, which is not conducive to delivery.

[0004] (2) For surgeries where the suction catheter does not need to bend to reach the target thrombus aspiration site, although it can be delivered to the target thrombus aspiration site without the aid of another layer of bending sheath, when the suction catheter reaches the target thrombus aspiration site, without the auxiliary bending of the outer layer of bending sheath, only the thrombus at the position directly opposite the distal opening of the suction catheter can be aspirated, resulting in poor suction effect. If a better suction effect is to be achieved, another layer of bending sheath is also needed, resulting in the same problem as (1). Summary of the invention

[0005] The object of the present invention is to provide an adjustable suction catheter, a suction device and an operating handle to alleviate the above-mentioned technical problems existing in the prior art.

[0006] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides an adjustable bend suction catheter, comprising a tubular structure, a traction member, and an embedded stent. The distal end of the traction member is fixed to the distal end of the tubular structure, and the traction member is pulled in the proximal direction, so that the distal end of the tubular structure can be pulled to bend toward the side of the traction member being pulled. The embedded stent is embedded and connected to the distal end of the tubular structure, and comprises a plurality of wavy stent rings arranged at intervals in the axial direction, and a plurality of connecting ribs are arranged and connected circumferentially at intervals between adjacent wavy stent rings, and the directions of all the connecting ribs are arranged in a spiral with the same rotation direction around the central axis of the wavy stent ring.

[0008] In the adjustable bend suction catheter provided in this embodiment, optionally and preferably: the distal end of the tube structure is fixed with an end hard fixing piece, and the distal end of the traction piece is connected to the end hard fixing piece; and / or, the tube structure also has an axially extending traction channel, and the traction piece passes through the traction channel. Here, "and / or" means that the structure before "and / or" and the structure after "and / or" are set simultaneously or selectively.

[0009] In the adjustable bend suction catheter provided in this embodiment, optionally and preferably: the traction member includes a first traction member and a second traction member, and the distal ends of the first traction member and the second traction member are respectively fixedly connected to two radially opposite sides of the distal end of the tube structure.

[0010] In a second aspect, an embodiment of the present invention provides a suction device, comprising an operating handle and an adjustable suction catheter as described in any optional embodiment of the first aspect.

[0011] Specifically, the operating handle includes a main handle, a bending handle and a suction joint which are axially connected. The proximal end of the tubular structure is connected to the distal end of the main handle and communicates with the inner cavity of the main handle; the bending handle is installed on the main handle; the distal end of the suction joint is installed on the proximal end of the main handle and the proximal end of the bending handle, whichever is on the proximal side, and communicates with the inner cavity of the proximal end. The proximal end of the traction member is connected to the bending handle, and the traction member is pulled by the bending handle.

[0012] In the suction device provided in this embodiment, optionally and preferably, the proximal end of the bending adjustment handle is axially limited and circumferentially rotatably installed in the proximal inner cavity of the main handle; an annular blind hole coaxial with the tube structure is provided on the distal surface of the bending adjustment handle, the plane where the proximal surface of the annular blind hole is located is an inclined surface, and an annular limiting groove arranged concentrically with the annular blind hole is provided on the inclined bottom wall of the annular blind hole. The traction member is a traction rod member with a spherical end at the proximal end, the traction rod member is inserted into the annular blind hole of the bending adjustment handle through the through hole provided in the main handle, and the spherical end of the traction rod member is axially limited and circumferentially slidably connected in the annular limiting groove.

[0013] Further and more preferably, the radial cross-section of the annular limiting groove is spherical.

[0014] In addition, preferably, an inwardly protruding annular limit protrusion is provided at the proximal end of the inner cavity of the main handle, an axially protruding hollow plug-in portion is provided at the distal end of the bending adjustment handle, and an annular groove is provided on the outer peripheral surface of the hollow plug-in portion; in the assembled state, the hollow plug-in portion is inserted into the proximal inner cavity of the main handle, and the annular limit protrusion cooperates with the annular groove.

[0015] Further and more preferably, the inner cavity of the main handle is a stepped hole with a proximal diameter larger than a distal diameter; in the assembled state, the hollow plug-in portion is inserted into the proximal hole of the inner cavity of the main handle and is axially limited to the proximal side of the proximal surface of the proximal hole of the inner cavity.

[0016] In addition, in the suction device provided in this embodiment, optionally and preferably, the bending handle is provided with: when the distal end of the tubular structure is straightened, the bending handle is provided with a straightening mark relative to the rotation position of the main handle, and / or, when the distal end of the tubular structure is bent to a certain side, the bending mark of the side of the bending handle relative to the rotation position of the main handle. "And / or" means that the straightening mark and the bending mark include at least the following settings: (1) only the straightening mark is provided, and no bending mark is provided; (2) only the bending mark is provided, and no straightening mark is provided; (1) both the straightening mark and the bending mark are provided; in addition, for the bending mark, when two radially symmetrical pulling members are provided, the left bending mark and the right bending mark can also be separated.

[0017] In addition, the third aspect of the embodiment of the present invention further provides an operating handle, which can be applied to the suction device provided by the second aspect of the embodiment of the present invention;

[0018] The operating handle comprises a traction rod, and a main handle and a bending handle respectively penetrating axially;

[0019] The proximal end of the bending adjustment handle is axially limited and circumferentially rotatably installed in the proximal inner cavity of the main handle; an annular blind hole extending in the circumferential direction is provided on the distal end surface of the bending adjustment handle, the plane where the proximal end surface of the annular blind hole is located is an inclined surface, and an annular limiting groove arranged concentrically with the annular blind hole is provided on the inclined bottom wall of the annular blind hole;

[0020] The proximal end of the traction rod is provided with a spherical end, and the traction rod passes through the through hole provided in the main handle and is inserted into the annular blind hole of the bending adjustment handle. The spherical end of the proximal end of the traction rod is axially limited and circumferentially slidably connected in the annular limiting groove.

[0021] The embodiments of the present invention solve the problem in the prior art that the suction catheter cannot be designed into an autonomous bending structure because it cannot take into account both flexibility and radial support force.

[0022] Specifically, with respect to the adjustable suction catheter provided in the embodiment of the present invention, its embedded stent has good flexibility because the wavy stent ring has a large radial supporting force, and because the connecting ribs arranged in the same direction of spiral are used as the connecting structure between adjacent wavy stent rings. The embedded stent replaces the traditional stent and is embedded in the distal end of the tube body structure of the suction catheter. When suction is conducted through the suction cavity of the tube body structure, the distal end of the tube body structure can be kept open under negative pressure. At the same time, the distal end of the tube body structure can be bent using a traction member, that is, the suction catheter body itself can be bent independently, without the need to use an adjustable outer sheath as in the prior art.

[0023] Therefore, the adjustable bend suction catheter provided in the first aspect of this embodiment and the suction device including the adjustable bend suction catheter provided in the second aspect can at least achieve the following beneficial effects:

[0024] (1) During suction, the distal end of the tube will not be closed due to negative pressure, thereby interrupting suction, which is beneficial to improving surgical efficiency;

[0025] (2) During suction, the distal end of the tube can be bent by a traction device to expand the angle range of thrombus that can be sucked out and improve the suction effect;

[0026] (3) During the process of delivering the aspiration catheter to the target site for thrombus aspiration and retrieving the aspiration catheter from the target site for thrombus aspiration, the degree of curvature of the distal end of the aspiration catheter can be directly adjusted according to the access conditions to achieve the delivery of the aspiration catheter through a curve. Since no additional bending adjustment of the sheath is required, the steps of withdrawing the sheath before and after aspiration to expose the aspiration catheter and pushing the sheath forward after aspiration before withdrawing the catheter are omitted, thereby making the operation simpler and the surgical efficiency higher.

[0027] (4) Because there is no need for an additional bending sheath, the diameter of the suction catheter during delivery is smaller and can pass through a blood vessel segment with a smaller diameter without damaging the blood vessel. This makes it more efficient and causes less damage to the patient's body. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A perspective view of the distal end structure of the adjustable bend suction catheter provided in an embodiment of the present invention;

[0030] Figure 2 Schematic diagram of a stent embedded in an adjustable curved suction catheter provided in an embodiment of the present invention Figure 1 ;

[0031] Figure 3 Schematic diagram of a stent embedded in an adjustable curved suction catheter provided in an embodiment of the present invention Figure 2 ;

[0032] Figure 4 A schematic diagram of the overall structure of a suction device provided in an embodiment of the present invention;

[0033] Figure 5 A cross-sectional view of an adjustable suction conduit in a suction device provided in an embodiment of the present invention;

[0034] Figure 6 A diagram showing the connection relationship between the traction member and the hard fixing member in the suction device provided in an embodiment of the present invention;

[0035] Figure 7 An assembly cross-sectional view of a traction member, a tube structure, a main handle, a bending adjustment handle, and a suction joint in a suction device provided in an embodiment of the present invention;

[0036] Figure 8 This is the axonometric drawing of the overall structure of the bending handle;

[0037] Fig. 9 is a perspective view of the annular limiting blind hole in the bending handle;

[0038] Fig.10 It is a schematic diagram of a half-section structure of the bending handle cut along the plane where the proximal end surface of the annular blind hole is located;

[0039] Fig.11 A diagram showing the relative position relationship between the proximal end of the traction member and the bending adjustment handle when two traction members are provided and the distal end of the tube structure is in a straightened state;

[0040] Fig.12 for Fig.11 A side sectional view of

[0041] Fig.13 A diagram showing the relative position relationship between the proximal end of the traction member and the bending adjustment handle when two traction members are provided and one end of the tube structure is bent to one side;

[0042] Fig.14 for Fig.13 A front cross-sectional view of

[0043] Fig.15 A half-section view of the main handle;

[0044] Fig.16 This is the overall structural axonometric view of the suction joint.

[0045] Icons: 1-tube structure; 11-suction cavity; 12-traction channel; 2-traction member; 201-spherical end; 21-first traction member; 22-second traction member; 3-embedded bracket; 31-wavy bracket ring; 32-connecting rib; 4-hard fixing member; 5-main handle; 51-annular limiting protrusion; 6-bending handle; 61-annular blind hole; 62-annular limiting groove; 63-hollow plug-in part; 631-annular groove; 7-suction connector. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that like reference numerals and letters denote similar items in the drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0049] In the description of the present invention, it should be noted that the terms "proximal end", "distal end", "front end", "rear end", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0050] In particular, in the present invention, the end of the medical device close to the operator during surgery is the proximal end of the medical device, and the end of the medical device entering the patient's blood vessel is the distal end of the medical device (the front end of the medical device is the distal end, and the rear end of the medical device is the proximal end).

[0051] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0053] Embodiment 1

[0054] This embodiment provides an adjustable curved suction catheter, referring to Figures 1 to 3 The adjustable bend suction catheter comprises a tube structure 1, a traction member 2 and an embedded stent 3. The distal end of the traction member 2 is fixed to the distal end of the tube structure 1. Pulling the traction member 2 toward the proximal direction can pull the distal end of the tube structure 1 to bend toward the pulled traction member 2. The embedded stent 3 is embedded and connected to the distal end of the tube structure 1. The specific structure of the embedded stent 3 can be as follows: Figure 2 and Figure 3 And its deformation obtains, including multiple wavy support rings 31 arranged at intervals in the axial direction, multiple connecting ribs 32 are arranged and connected circumferentially at intervals between adjacent wavy support rings 31, and the directions of all connecting ribs 32 are arranged in a spiral with the same rotation direction around the central axis of the wavy support ring 31.

[0055] This embodiment solves the problem in the prior art that the suction catheter cannot be designed into an autonomous bending structure because it cannot take into account both flexibility and radial support force.

[0056] Specifically, in the above structure, the embedded stent 3 has good flexibility because the wavy stent ring 31 has a large radial supporting force, and the connecting ribs 32 arranged in the same direction of spiral rotation serve as the connecting structure between adjacent wavy stent rings 31. The embedded stent 3 replaces the traditional stent and is embedded in the distal end of the tube body structure 1 of the suction catheter. When suction is drawn through the suction cavity 11 of the tube body structure 1, the distal end of the tube body structure 1 can be kept open under negative pressure. At the same time, the traction member 2 can be used to bend the distal end of the tube body structure 1, that is, the suction catheter body itself can be bent independently, without the need to use an adjustable outer sheath as in the prior art.

[0057] Therefore, the adjustable bend suction catheter provided in this embodiment can at least achieve the following beneficial effects:

[0058] (1) During suction, the distal end of the tube will not be closed due to negative pressure, thereby interrupting suction, which is beneficial to improving surgical efficiency;

[0059] (2) During suction, the distal end of the tube body can be bent by the traction member 2 to expand the angle range of thrombus that can be sucked out and improve the suction effect;

[0060] (3) During the process of delivering the aspiration catheter to the target site for thrombus aspiration and retrieving the aspiration catheter from the target site for thrombus aspiration, the degree of curvature of the distal end of the aspiration catheter can be directly adjusted according to the access conditions to achieve the delivery of the aspiration catheter through a curve. Since no additional bending adjustment of the sheath is required, the steps of withdrawing the sheath before and after aspiration to expose the aspiration catheter and pushing the sheath forward after aspiration before withdrawing the catheter are omitted, thereby making the operation simpler and the surgical efficiency higher.

[0061] (4) Because there is no need for an additional bending sheath, the diameter of the suction catheter during delivery is smaller and can pass through a blood vessel segment with a smaller diameter without damaging the blood vessel. This makes it more efficient and causes less damage to the patient's body.

[0062] Continue to refer to Figure 1 In the adjustable bend suction catheter provided in this embodiment, optionally and preferably: the tubular structure 1 also has an axially extending traction channel 12, and the traction member 2 passes through the traction channel 12. Optionally and preferably: the distal end of the tubular structure 1 is fixed with an end hard fixing member 4, and the distal end of the traction member 2 is connected to the end hard fixing member 4, and the hard fixing member 4 is preferably as follows Figure 1 The ring shown.

[0063] In addition, in order to achieve bidirectional bending, in the adjustable bending suction catheter provided in this embodiment, it is optional and more preferred that: the traction member 2 includes a first traction member 21 and a second traction member 22, and the distal ends of the two are respectively fixedly connected to the two radially opposite sides of the distal end of the tube body structure 1; the traction member 2 can optionally have a structure such as a traction wire or a traction rod.

[0064] Embodiment 2

[0065] This embodiment provides a suction device, which includes an operating handle and an adjustable suction catheter provided by any optional implementation manner in Example 1.

[0066] Specifically, refer to Figures 4 to 16 The above-mentioned operating handle includes a main handle 5, a bending handle 6 and a suction joint 7 which are axially connected. The proximal end of the tubular structure 1 is connected to the distal end of the main handle 5 and communicates with the inner cavity of the main handle 5; the bending handle 6 is installed on the main handle 5; the distal end of the suction joint 7 is installed on the proximal end of the main handle 5 and the proximal end of the bending handle 6, which is on the proximal side and communicates with the inner cavity of the side. The proximal end of the traction member 2 is connected to the bending handle 6, and the traction member 2 is pulled by the bending handle 6 to achieve the function of bending the distal end of the tubular structure 1.

[0067] Since the suction device provided in this embodiment includes the adjustable bend suction catheter described in Example 1, the suction device provided in this embodiment can achieve all the beneficial effects that can be achieved by the adjustable bend suction catheter in Example 1, and its specific structure and achievable effects can be obtained by referring to the various optional or preferred implementations in Example 1.

[0068] Further:

[0069] In the suction device provided in this embodiment, there are many specific optional structures of the bending handle, such as but not limited to the connection method of the bending handle and the bending wire of the adjustable bending sheath in the prior art, so as to pull the corresponding traction wire in the proximal direction and fix the proximal end of the traction wire on the bending handle to achieve bending, and release the traction wire when straightening to make the tube structure 1 straighten. However, this structure is more suitable for the adjustable bending sheath in the prior art, mainly because there is no embedded stent structure inside the distal end of the bending sheath, and the distal end of the sheath can easily rebound after the traction wire is released; but for the suction catheter, because the distal end of its tube structure 1 is embedded with an embedded stent 3, the bending handle designed in this way needs to be repeatedly tested during production to avoid the embedded stent 3 with different parameters such as beam length hindering the autonomous rebound of the distal end of the tube structure 1, which is not conducive to efficient production, and may also cause the problem of poor rebound after long-term use.

[0070] In this regard, preferably, Figures 4 to 7 As shown, the proximal end of the bending handle 6 is axially limited and circumferentially mounted in the proximal inner cavity of the main handle 5, and the distal end of the suction joint 7 is mounted on the proximal end of the bending handle 6 and communicated with its inner cavity. Figures 8 to 14 The distal end surface of the bending adjustment handle 6 is provided with an annular blind hole 61 coaxial with the tube structure 1, the plane where the proximal end surface of the annular blind hole 61 is located is an inclined surface, and an annular limiting groove 62 arranged concentrically with the annular blind hole 61 is provided on the inclined bottom wall of the annular blind hole 61. The traction member 2 is a traction rod member with a spherical end 201 at the proximal end, and the traction rod member is inserted into the annular blind hole 61 of the bending adjustment handle 6 through the through hole provided in the main handle 5, and the spherical end 201 at the proximal end of the traction rod member is axially limited and circumferentially slidably connected in the annular limiting groove 62. There are many specific manufacturing methods for the spherical end 201 at the proximal end of the traction rod to be axially limited in the annular limiting groove 62, including but not limited to forming the assembly structure by 3D printing during manufacturing, or making the bending handle 6 composed of at least two sub-shells, placing the spherical end 201 at the proximal end of the traction rod into the annular limiting groove 62 when opening, and then splicing each sub-shell, or other optional manufacturing methods. Further and more preferably, the radial cross-section of the annular limiting groove 62 is spherical, so as to facilitate manufacturing and ensure the reliability of the axial limiting of the spherical end 201 by the annular limiting groove 62.

[0071] When the bending handle 6 is rotated relative to the main handle 5, the inclined surface of the annular limit groove 62 in the annular blind hole 61 plays a role similar to that of a "cam mechanism", and the spherical end 201 at the proximal end of the traction rod slides along the inclined surface in the annular limit groove 62, thereby causing the traction rod to rise or fall. For the descending traction rod, the distal end of the tube structure 1 can be pulled to bend toward the side connected to the traction rod. Since the traction member 2 adopts a rod structure, the distal end of the tube structure 1 is pushed and pulled to achieve bending and straightening, so that the tube structure 1 does not need to be able to rebound autonomously, the production efficiency is high, and the problem of being unable to straighten after multiple uses is not likely to occur.

[0072] In order to achieve bidirectional bending, according to the first embodiment, the traction rod includes a first traction member 21 and a second traction member 22, both of which are rod structures, and the distal ends of the two traction members are respectively fixedly connected to the two radially opposite sides of the distal end of the tube structure 1. Under such a structure, the reference Fig.11 and Fig.12 , is to control the state of the distal end of the pipe structure 1 returning to straightness, refer to Fig.13 and Fig.14 In order to control the bending state of the distal end of the tube body structure 1 toward the side connected to the first traction member 21, it can continue to rotate so that the spherical end 201 of the second traction member 22 is lower than the spherical end 201 of the first traction member 21 to control the bending state of the distal end of the tube body structure 1 toward the side connected to the second traction member 22. It is preferred to set the straightening state as the initial state, so as to control the two bending directions by forward rotation and reverse rotation relative to the main handle 5 respectively.

[0073] For more convenient operation, the bending handle 6 is optionally and preferably provided with: a straightening mark indicating the rotation position of the bending handle 6 relative to the main handle 5 when the distal end of the tubular structure 1 straightens, and / or a bending mark indicating the rotation position of the bending handle 6 relative to the main handle 5 when the distal end of the tubular structure 1 bends to a certain side. Wherein: "and / or" means that the straightening mark and the bending mark include at least the following settings: (1) only a straightening mark is provided without a bending mark; (2) only a bending mark is provided without a straightening mark; (1) both a straightening mark and a bending mark are provided; in addition, for the bending mark, when two radially symmetrical pulling members are provided, a left bending mark and a right bending mark can also be separated. There are many types of the above marking symbols, such as but not limited to: Figures 8 to 10 As shown, the "S" mark is used to straighten, the "CL" mark is used to control the left bend, the "CR" mark is used to control the right bend, and so on.

[0074] Furthermore, preferably, Fig.15 As shown, a ring-shaped limiting protrusion 51 protruding inward is provided at the proximal end of the inner cavity of the main handle 5. Figures 4 to 14 , an axially protruding hollow inserting portion 63 is provided at the distal end of the bending handle 6, and an annular groove 631 is provided on the outer peripheral surface of the hollow inserting portion 63; Figure 4 and Figure 7 As shown, the hollow plug-in portion 63 is inserted into the proximal inner cavity of the main handle 5, and the annular limiting protrusion 51 cooperates with the annular groove, so that the bending handle 6 is axially limited to the main handle 5 but can rotate circumferentially relative to the main handle 5.

[0075] Further and more preferably, the inner cavity of the main handle 5 is a stepped hole with a proximal diameter larger than a distal diameter; in the assembled state, the hollow plug-in portion 63 is inserted into the proximal hole of the inner cavity of the main handle 5, and is axially limited to the proximal side of the proximal surface of the proximal hole of the inner cavity of the main handle 5 to improve the assembly accuracy.

[0076] The specific structure of the suction connector 7 can be referred to Fig.16 The outside of the device is provided with threads for connecting the suction device, and the inside is preferably a step hole. The distal hole is used to fix the proximal end of the tube structure 1, and the proximal hole can be connected to the suction syringe.

[0077] Embodiment 3

[0078] This embodiment provides an operating handle, which can be applied to the suction device provided in the second embodiment, but its application is not limited to the suction device provided in the second embodiment, but can also be used as an adjustable operating handle in other adjustable bend catheter structures (not necessarily suction catheters).

[0079] The basic structure of the operating handle includes a traction rod, and a main handle 5 and a bending handle 6 that are axially penetrated respectively; the proximal end of the bending handle 6 is axially limited and circumferentially rotatably installed in the proximal inner cavity of the main handle 5; an annular blind hole 61 extending in the circumferential direction is provided on the distal end surface of the bending handle 6, the plane where the proximal end surface of the annular blind hole 61 is located is an inclined surface, and an annular limiting groove 62 arranged concentrically with the annular blind hole 61 is provided on the inclined bottom wall of the annular blind hole 61; a spherical end 201 is provided at the proximal end of the traction rod, and the traction rod passes through the through hole provided in the main handle 5 and is inserted into the annular blind hole 61 of the bending handle 6, and the spherical end 201 at the proximal end of the traction rod is axially limited and circumferentially slidably connected in the annular limiting groove 62. During installation, the bending function can be realized by fixing the distal end of the traction rod to the distal side of the catheter structure to be assembled.

[0080] Other deformable structures of the operating handle can be obtained according to the second embodiment.

[0081] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other; the above embodiments in this specification are only used to illustrate the technical solution of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that: it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present invention.

Claims

1. A suction device, characterized in that: It includes an operating handle and an adjustable curved suction catheter; The adjustable bend suction catheter comprises a tube body structure (1), a traction member (2) and an embedded stent (3); The distal end of the traction member (2) is fixed to the distal end of the tubular structure (1), and the traction member (2) is pulled toward the proximal direction, so that the distal end of the tubular structure (1) can be pulled to bend toward the side of the traction member (2) being pulled; the embedded bracket (3) is embedded and connected to the distal end of the tubular structure (1), and comprises a plurality of wavy bracket rings (31) arranged at intervals in the axial direction, and a plurality of connecting ribs (32) are arranged and connected circumferentially at intervals between adjacent wavy bracket rings (31), and all the connecting ribs (32) are arranged in a spiral in the same direction around the central axis of the wavy bracket ring (31); The operating handle comprises a main handle (5), a bending handle (6) and a suction joint (7) which are axially connected to each other; The proximal end of the tube structure (1) is connected to the distal end of the main handle (5) and communicates with the inner cavity of the main handle (5); the bending adjustment handle (6) is installed on the main handle (5); the distal end of the suction joint (7) is installed on the proximal end of the main handle (5) and the proximal end of the bending adjustment handle (6), whichever is on the proximal side, and communicates with the inner cavity of the proximal end; the proximal end of the traction member (2) is connected to the bending adjustment handle (6), and the traction member (2) is pulled by the bending adjustment handle (6); The proximal end of the bending adjustment handle (6) is axially limited and circumferentially rotatably mounted on the proximal inner cavity of the main handle (5); an annular blind hole (61) coaxial with the tube structure (1) is provided on the distal end surface of the bending adjustment handle (6); the plane where the proximal end surface of the annular blind hole (61) lies is an inclined surface; and an annular limiting groove (62) is provided on the inclined bottom wall of the annular blind hole (61) and is arranged concentrically with the annular blind hole (61); The traction member (2) is a traction rod member having a spherical end (201) at the proximal end thereof. The traction rod member is inserted into the annular blind hole (61) of the bending adjustment handle (6) through a through hole provided in the main handle (5). The spherical end (201) at the proximal end of the traction rod member is axially limited and circumferentially slidably connected in the annular limiting groove (62).

2. The suction device according to claim 1, characterized in that: The distal end of the tubular structure (1) is fixed with an end hard fixing piece (4), and the distal end of the traction piece (2) is connected to the end hard fixing piece (4); and / or the tubular structure (1) further comprises an axially extending traction channel (12), and the traction piece (2) passes through the traction channel (12).

3. The suction device according to claim 1, characterized in that: The traction member (2) comprises a first traction member (21) and a second traction member (22), the distal ends of which are respectively fixedly connected to two radially opposite sides of the distal end of the tubular structure (1).

4. The suction device according to claim 1, characterized in that: The radial cross section of the annular limiting groove (62) is spherical.

5. The suction device according to claim 1, characterized in that: An inwardly protruding annular limiting protrusion (51) is provided at the proximal end of the inner cavity of the main handle (5), an axially protruding hollow plug-in portion (63) is provided at the distal end of the bending adjustment handle (6), and an annular groove (631) is provided on the outer peripheral surface of the hollow plug-in portion (63); in the assembled state, the hollow plug-in portion (63) is inserted into the proximal inner cavity of the main handle (5), and the annular limiting protrusion (51) and the annular groove cooperate with each other.

6. The suction device according to claim 5, characterized in that: The inner cavity of the main handle (5) is a stepped hole with a proximal diameter larger than a distal diameter; in the assembled state, the hollow plug-in portion (63) is inserted into the inner cavity proximal hole of the main handle (5) and is axially limited to the proximal side of the proximal surface of the inner cavity proximal hole.

7. The suction device according to claim 1, characterized in that: The bending adjustment handle (6) is provided with: a straightening mark indicating the rotational position of the bending adjustment handle (6) relative to the main handle (5) when the distal end of the tubular structure (1) is straightened, and / or a bending mark indicating the rotational position of the bending adjustment handle (6) relative to the main handle (5) when the distal end of the tubular structure (1) is bent to a certain side.

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