Interventional catheter switching device, interventional catheter and use method of interventional catheter

Abstract

The invention provides an interventional catheter switching device, an interventional catheter and a using method of the interventional catheter. The interventional catheter switching device comprises a main catheter body and an inner catheter which is arranged on the outer side of the main catheter body in a sleeving mode and moves in the longitudinal direction, and at least part of the side wall of the main catheter body forms a guiding part which guides the inner catheter to move in the longitudinal direction when the inner catheter rotates relative to the main catheter body; at least one switching piece rotationally connected with the inner pipe is embedded in the circumferential direction of the inner pipe, and the switching piece forms a pivotal shaft which forms a set included angle with the longitudinal extending direction of the main pipe body; the switching piece is provided with a guide end guided by the guide part, and when any end part of the switching piece in the longitudinal direction is stressed, the switching piece rotates around the pivot shaft so as to release the guide state formed by the guide end and the guide part. According to the application, the mesh basket assembly can be quickly released or slowly released according to different positions where thrombus is formed in blood vessels of different patients, so that the thrombolysis treatment effect is prevented from being influenced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an interventional catheter switching device, an interventional catheter and a use method thereof. Background Art

[0002] Abnormal blood flow in blood vessels, such as slow blood flow, vortexes in blood flow, or poor venous blood return, can lead to the formation of thrombus, resulting in blood vessel blockage or stenosis, which can cause a series of adverse consequences such as tissue hypoxia, abnormal intravascular pressure, increased cardiac load and heart failure. At present, thrombus removal is widely used. Thrombolytic therapy mainly involves injecting thrombolytic drugs into the thrombus site through a catheter to remove thrombus plaques; while percutaneous mechanical thrombectomy (PMT) is a mechanical device to remove intravascular obstructions, including dissolution, crushing, suction, stent or basket thrombectomy, which is currently the main clinical treatment method. Traditional percutaneous mechanical thrombectomy devices, one of which is to insert a balloon catheter into the blood vessel and pass through the thrombus, then expand the balloon to compress the thrombus on the blood vessel wall or flow into the distal blood vessel to open the blocked blood vessel. Another method is to deliver a self-expanding stent to the site of the thrombus via a microcatheter. The stent is released from the microcatheter and expanded to support the narrowed and occluded segment of the blood vessel, reduce vascular elastic retraction and reshaping, and thus maintain unobstructed blood flow in the lumen.

[0003] However, the prior art does not have a switching device that can simultaneously control the stent to achieve fast release and slow release functions, making it difficult to select fast release or slow release stents for different locations of thrombus formation in different patients' blood vessels, affecting the effect of thrombolytic therapy.

[0004] In view of this, it is necessary to improve the switching device for controlling the release of the stent in the prior art to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to disclose an interventional catheter switching device, an interventional catheter and a method of using the same, so as to solve the many defects existing in the switching device for controlling the release of stents in the prior art, especially to achieve the ability to select a quick release or slow release of the basket component according to the different locations of thrombus formation in the blood vessels of different patients, so as to avoid affecting the effect of thrombolytic therapy.

[0006] To achieve the above object, the present invention provides an interventional catheter switching device, comprising: a main body, an inner tube sleeved outside the main body and displaced in the longitudinal direction, wherein at least a part of the side wall of the main body forms a guide portion for guiding the inner tube to displace in the longitudinal direction when rotating relative to the main body;

[0007] At least one switching member rotatably connected to the inner tube is embedded in the inner tube circumferentially, and the switching member forms a pivot axis which forms a set angle with the longitudinal extension direction of the main tube;

[0008] The switching member is constructed with a guiding end guided by the guiding portion. When any end of the switching member along the longitudinal direction is subjected to force, the switching member rotates around the pivot axis to release the guiding state formed by the guiding end and the guiding portion.

[0009] As a further improvement of the present invention, when the switching member is away from the guiding end and a force is applied to the end portion along the longitudinal direction, the switching member rotates around the pivot axis to release the guiding state formed by the guiding end and the guiding portion.

[0010] As a further improvement of the present invention, when the switching member is away from the guiding end and the end portion along the longitudinal direction is subjected to force, the guiding state formed by the guiding end and the guiding portion is released, and the guiding state is restored when the force on the end portion is removed.

[0011] As a further improvement of the present invention, when the switching member is away from the guiding end and a force is applied to the end portion along the longitudinal direction, the switching member rotates around the pivot axis and keeps the guiding end and the guiding portion in a separated state.

[0012] As a further improvement of the present invention, the guide portion is configured as a spiral groove arranged in a spiral shape along the longitudinal direction around the side wall of the main pipe body, and the inner pipe is synchronously displaced along the longitudinal direction when rotating relative to the main pipe body.

[0013] As a further improvement of the present invention, the guide portion is configured as a guide groove arranged in a spiral shape along the longitudinal direction around the side wall of the main body, the inner tube is displaced in the longitudinal direction when it rotates relative to the main body, and the guide groove forms at least one locking state that limits the longitudinal displacement of the inner tube relative to the main body when the inner tube rotates relative to the main body.

[0014] As a further improvement of the present invention, the guide groove comprises: a plurality of rotating grooves and movable grooves alternately distributed in the circumferential direction and the longitudinal direction;

[0015] The rotation groove guides the inner tube to rotate relative to the main tube body and restricts the inner tube from being displaced longitudinally relative to the main tube body, and the movable groove guides the inner tube to be displaced longitudinally relative to the main tube body.

[0016] As a further improvement of the present invention, the guide groove comprises: a plurality of rotating grooves and movable grooves alternately distributed in the circumferential direction and the longitudinal direction, and a plurality of spiral guide grooves connecting the rotating grooves and / or the movable grooves and extending in a spiral shape;

[0017] The rotation groove guides the inner tube to rotate relative to the main tube body and limits the inner tube from longitudinally displacing relative to the main tube body, the movable groove guides the inner tube to longitudinally displace relative to the main tube body, and the rotation guide groove guides the inner tube to synchronously displace longitudinally when rotating relative to the main tube body.

[0018] As a further improvement of the present invention, the guide portion at least partially extends into the side wall of the main tube.

[0019] As a further improvement of the present invention, the pivot shaft is composed of a supporting end protruding from the switching member along a set pivot direction formed by the pivot shaft, and the inner tube forms a first pivot part that accommodates the supporting end for the switching member to rotate along the pivot direction.

[0020] As a further improvement of the present invention, the pivot shaft is composed of an inner tube that protrudes along a set pivot direction formed by the pivot shaft and at least partially extends into the support end of the switching member, and the switching member forms a second pivot portion that accommodates the support end for the switching member to rotate along the pivot direction.

[0021] As a further improvement of the present invention, the pivot shaft is composed of a pivot assembly in which a switching member and an inner tube are mutually embedded along a set pivot direction formed by the pivot shaft and the switching member is allowed to rotate along the pivot direction.

[0022] As a further improvement of the present invention, the pivot assembly includes: a first protruding end and a second protruding end formed by the switching member and the inner tube respectively protruding in the same direction along the pivot direction, and a third pivot part and a fourth pivot part respectively formed by the inner tube and the switching member to accommodate the first protruding end and the second protruding end, so that the switching member can rotate along the pivot direction.

[0023] As a further improvement of the present invention, the axial direction of the pivot shaft forms a set angle α with the longitudinal extension direction of the main pipe, and the angle α is greater than 0° and less than 180°.

[0024] As a further improvement of the present invention, the interventional catheter switching device further comprises: an outer tube coaxially sleeved on the outer side of the inner tube and surrounding the switching member, the inner tube radially protruding outward to form an outer plate, and a first elastic member clamped between the outer plate and the outer tube;

[0025] The side wall of the outer tube is radially protruded inward to form a protrusion that abuts against the guide end, and the first elastic member forms an elastic biasing force on the outer tube in the longitudinal direction to maintain the guiding state between the guide end and the guide portion.

[0026] As a further improvement of the present invention, the interventional catheter switching device further comprises: an outer tube coaxially sleeved on the outer side of the inner tube and surrounding the switching member, a movable rod penetrating the side wall of the outer tube, a transmission rod rotatably connected with a switching end formed by an end of the switching member away from the guide end, one end of the movable rod extending into the side wall of the outer tube is rotatably connected with an end of the transmission rod away from the switching end, one end of the movable rod extending out of the side wall of the outer tube is radially protruded outward to form a top cover, and a second elastic member clamped between the side wall of the outer tube and the top cover;

[0027] The second elastic member forms an elastic force on the top cover along the penetrating direction of the movable rod penetrating the side wall of the outer tube, so as to maintain the guiding state formed between the guiding end and the guiding part.

[0028] As a further improvement of the present invention, the pivot shaft and the inner tube are configured with a pair of torsion members for applying torsion force to the guide end to maintain the guiding state formed between the guide end and the guide portion.

[0029] As a further improvement of the present invention, the outer tube is configured with a groove, the groove at least partially accommodating the switching end formed by the end of the switching member away from the guide end and in the longitudinal direction, and the groove forms a guide annular surface connected to the protruding portion;

[0030] The outer tube is displaced in the longitudinal direction to drive the guide annular surface to drive the switching end, and the switching member rotates around the pivot axis to release the guiding state formed between the guide end and the guiding part before the guide annular surface contacts the switching end.

[0031] Based on the same inventive concept, the present application also provides an interventional catheter, comprising:

[0032] An interventional catheter switching device as disclosed in any of the above inventions, a guide tube axially penetrating the interventional catheter switching device, a basket assembly formed at the end of the guide tube, and a transmission assembly disposed on the interventional catheter switching device;

[0033] The interventional catheter switching device drives the transmission assembly to move longitudinally to drive the basket assembly to expand or contract.

[0034] As a further improvement of the present invention, the interventional catheter further comprises: a base supporting the interventional catheter switching device, the base comprising at least one wing plate that fits a human limb, and the wing plate forms a through hole.

[0035] As a further improvement of the present invention, the transmission assembly comprises: an active clamping ring sleeved on the outside of the main body and driven by the interventional catheter switching device, a transmission tube axially arranged inside the main body and connected to the active clamping ring, and an active tube longitudinally embedded at the front end of the transmission tube and extending out of the main body;

[0036] The movable tube is sleeved on the outside of the guide tube and connected to the basket assembly. The movable clamping ring is displaced longitudinally relative to the main tube body to drive the movable tube to drive the basket assembly to expand or contract.

[0037] As a further improvement of the present invention, the transmission assembly further comprises: a connecting element driving the movable clamping ring to move longitudinally relative to the main pipe body;

[0038] The transmission pipe is radially protruded outward to form a plurality of first transmission blocks that penetrate the side wall of the main pipe body and at least partially extend into the movable clamping ring;

[0039] A plurality of guide grooves are formed on the side wall of the main tube and are distributed longitudinally for guiding the longitudinal displacement of the first transmission block.

[0040] As a further improvement of the present invention, the engagement element is configured as an outer shell circumferentially arranged around the inner tube and circumferentially separated from the main tube;

[0041] The movable snap ring is recessed radially inward to form a receiving groove, and the outer shell is configured with a rotating end that at least partially radially extends into the receiving groove, so that the outer shell can rotate axially relative to the main body;

[0042] The outer shell forms an extended wall that longitudinally abuts against both ends of the inner tube. The outer tube is constructed with a pusher that penetrates the side wall of the outer shell and is formed outside the outer shell. The side wall of the outer shell is provided with an open groove for guiding the longitudinal displacement of the pusher.

[0043] As a further improvement of the present invention, the connection element is configured as a connection shell which is axially sleeved on the outside of the main tube and connected to the inner tube;

[0044] The movable snap ring is recessed radially inward to form a receiving groove, and the connecting shell is constructed with a connecting end that at least partially radially extends into the receiving groove, so that the connecting shell can rotate axially relative to the main pipe body.

[0045] As a further improvement of the present invention, the engagement element is configured as an engagement protrusion formed by the end of the inner tube close to the movable snap ring protruding radially outward, and the engagement protrusion at least partially extends into the movable snap ring;

[0046] The movable clamping ring forms a second annular cavity circumferentially arranged outside the connecting protrusion, so that the inner tube can rotate axially relative to the movable clamping ring.

[0047] As a further improvement of the present invention, the transmission pipe is radially outwardly provided with a plurality of second transmission blocks penetrating the side wall of the main body and at least partially extending into the movable snap ring, and the movable snap ring forms a first annular cavity circumferentially arranged outside the second transmission block, so that the movable snap ring can rotate axially relative to the second transmission block;

[0048] The side wall of the main body is formed with a plurality of guide grooves distributed longitudinally for guiding the longitudinal displacement of the second transmission block;

[0049] The inner tube is fixedly connected to the movable snap ring. When the inner tube rotates relative to the main tube body, the movable snap ring is synchronously driven to rotate and displace in the longitudinal direction, so as to synchronously drive the second transmission block so that the transmission tube drives the movable tube to displace in the longitudinal direction, thereby driving the basket assembly to expand or contract.

[0050] As a further improvement of the present invention, the longitudinal ends of the main pipe body are respectively radially protruded outward to form a limit boss and a limit boss seat for limiting the longitudinal displacement of the transmission assembly. The interventional catheter also includes a limit tube coaxially arranged in the main pipe body, the limit tube is axially embedded in the limit boss seat, and partially movably extends axially into the transmission pipe.

[0051] As a further improvement of the present invention, a mesh cover unit is provided at the front end of the basket assembly in the longitudinal direction, and the mesh cover unit forms a funnel shape when opened, and the diameter ranges from 3 to 30 mm.

[0052] Based on the same inventive concept, the present application also provides a method for using an interventional catheter as disclosed in any of the aforementioned inventions, comprising the following steps:

[0053] Step S1, the guide tube enters the patient's blood vessel and delivers the basket assembly to the lesion;

[0054] Step S2, driving the transmission component to move longitudinally by the interventional catheter switching device in the guiding state, or driving the transmission component to move longitudinally by the interventional catheter switching device in the separated state;

[0055] Step S3: The transmission assembly drives the basket assembly to expand or contract.

[0056] As a further improvement of the present invention, before step S1, the step further includes: fixing the interventional catheter to the patient's limb.

[0057] Compared with the prior art, the present invention has the following beneficial effects:

[0058] First, when the guide end is engaged with the guide part, the guide end is guided by the guide part, and the guide end and the guide part form a guiding state, and then the inner tube is controlled to rotate axially relative to the main tube body, and the switching member is driven to rotate circumferentially, so that the guide end can be guided by the guide part during the circumferential rotation to move longitudinally, and then the switching member can synchronously drive the inner tube to move longitudinally. Therefore, in this guiding state, the inner tube can move slowly longitudinally when rotating relative to the main tube body, so as to achieve slow release of the basket assembly;

[0059] Secondly, when any end of the switching member along the longitudinal direction is subjected to force, the guide end is separated from the guide portion to release the guiding state formed by the guide end and the guide portion, and the guide end and the guide portion are kept in a separated state. In this separated state, the inner tube can be directly controlled to be quickly displaced along the longitudinal direction relative to the main tube body to achieve rapid release of the basket assembly;

[0060] Finally, in actual use, the basket assembly can be selected for fast release or slow release according to the different locations of thrombus formation in the blood vessels of different patients. For example, in the treatment of pulmonary embolism, it is necessary to slowly release the basket assembly to expand the basket assembly slowly, so as to slowly open the blood vessels for thrombolytic therapy, and prevent the basket assembly from being released too quickly and expanding too much, causing the basket assembly to over-open the blood vessels, which is easy to damage the blood vessel wall and stimulate the heart; when the embolism area is large and it is necessary to quickly establish a blood flow path to clear the embolized blood vessels, the basket assembly is controlled to be inserted into the embolism area, and the basket assembly is quickly released to expand the basket assembly quickly, and the thrombus is squeezed and cut during the expansion process, and the larger volume of the thrombus is broken into multiple smaller thrombi, so that the blood circulation in the blood vessels can be restored, so as to quickly establish a blood flow path to clear the embolized blood vessels, and the contact area between the released basket assembly and the thrombus can be increased to form an all-round contact, increase the exposure area of ​​the thrombus, improve the efficiency of the basket assembly in dissolving the thrombus, and avoid affecting the thrombolytic therapy effect. For another example, in the treatment of deep vein thrombosis in the lower extremities, the function of the quick-release basket component may be used preferentially to cut the thrombus and achieve the effect of quickly dissolving the thrombus.

[0061] In addition, by adding a mesh cover unit to the outer end of the basket assembly, the mesh cover unit can block the broken thrombus or the decomposition products of the thrombus, etc., to prevent the broken thrombus or the decomposition products of the thrombus from being freed to other areas of the blood vessel to form a secondary thrombus. Based on the clinical effect, complications such as right heart failure, respiratory failure and other complications can be prevented, and pulmonary hypertension can also be prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 A three-dimensional diagram of the connection between the main tube and the inner tube included in the interventional catheter switching device disclosed in the present invention;

[0063] Figure 2It is a schematic diagram of the inner tube included in the interventional catheter switching device after displacement along the direction of arrow X1;

[0064] Figure 3 For along Figure 2 A cross-sectional view formed by cutting the main pipe, inner pipe and switching member along the AA axis;

[0065] Figure 4 for Figure 3 A partial enlarged view of the middle circle B;

[0066] Figure 5 for Figure 4 A schematic diagram of the middle guide end being coupled to the guide portion;

[0067] Figure 6 for Figure 4 A schematic diagram showing the middle guide end being separated from the guide portion;

[0068] Figure 7 is an expanded view of the main body including the spiral groove along the axis P;

[0069] Figure 8 is an expanded view of a main tube including a spiral groove along an axis P in another embodiment;

[0070] Fig. 9 is an expanded view of a main tube including a spiral groove along the axis P in another embodiment;

[0071] Fig.10 is an expanded view of the main body including the guide groove along the axis P;

[0072] Fig.11 is an expanded view of a main pipe body including a guide groove along an axis P in another embodiment;

[0073] Fig.12 is an expanded view of a main pipe body including a guide groove along an axis P in another embodiment;

[0074] Fig.13 A three-dimensional diagram showing the connection between the inner tube and the switching member;

[0075] Fig.14 For along Fig.13 A cross-sectional view formed by cutting the inner tube and the switching member in the CC direction;

[0076] Fig.15 For along Fig.13 A cross-sectional view formed by cutting the inner tube and the switching member in the middle DD direction;

[0077] Fig.16 A cross-sectional view showing the connection between the inner tube and the switching member;

[0078] Fig.17 is a cross-sectional view of another embodiment in which the inner tube is connected to the switching member;

[0079] Fig.18 is a cross-sectional view of the connection between the inner tube and the switching member in another embodiment;

[0080] Fig.19 A three-dimensional diagram of the interventional catheter switching device disclosed in the present invention;

[0081] Fig. 20 for Fig.19 A partial cross-sectional view showing the middle guide end being engaged with the guide portion and the inner tube being connected to the outer tube;

[0082] Fig.21 for Fig.19 A partial cross-sectional view of the middle guide end being separated from the guide portion and the inner tube being connected to the outer tube;

[0083] Fig. 22 A three-dimensional diagram of an interventional catheter switching device according to another embodiment of the present invention;

[0084] Fig.23 for Fig. 22 A partial cross-sectional view showing the middle guide end being engaged with the guide portion and the inner tube being connected to the outer tube;

[0085] Fig.24 for Fig. 22 A partial cross-sectional view of the middle guide end being separated from the guide portion and the inner tube being connected to the outer tube;

[0086] Fig.25 for Fig.19 A cross-sectional view of the interventional catheter switching device disclosed in the present invention omitting the first elastic member;

[0087] Fig.26 A three-dimensional diagram of an interventional catheter including an interventional catheter switching device disclosed in the present invention, wherein the mesh cover unit is omitted;

[0088] Fig. 27 A three-dimensional diagram of the interventional catheter disclosed in the present invention omitting the base and the basket assembly;

[0089] Fig.28 For along Fig. 27 A cross-sectional view formed by cutting the interventional catheter switching device and the transmission assembly in the middle EE direction;

[0090] Fig.29 For along Fig. 27 A cross-sectional view formed by cutting the interventional catheter switching device and the transmission assembly in the middle FF direction;

[0091] Fig.30 is a cross-sectional view of the connection between the connecting unit and the inner tube in one embodiment;

[0092] Fig.31is a cross-sectional view of the connection between the connecting unit and the inner tube in another embodiment;

[0093] Fig.32 is a cross-sectional view of the connection between the movable clamp ring and the inner tube in another embodiment;

[0094] Fig.33 A cross-sectional view of the connection between the movable clamp ring and the inner tube in another embodiment;

[0095] Fig.34 For along Fig.29 A cross-sectional view formed by cutting the movable clamp ring and the transmission pipe in the middle GG direction;

[0096] Fig.35 For along Fig.32 A cross-sectional view formed by cutting the movable clamp ring and the inner tube in the middle HH direction;

[0097] Fig.36 For along Fig.33 A cross-sectional view formed by cutting the movable clamp ring and the inner tube in the middle II direction;

[0098] Fig.37 A three-dimensional diagram showing the connection between the basket assembly and the mesh cover unit;

[0099] Fig.38 is an overall diagram of the mesh cover unit;

[0100] Fig.39 The present invention is a flowchart of a method for using an interventional catheter including an interventional catheter switching device. DETAILED DESCRIPTION

[0101] The present invention is described in detail below in conjunction with the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these embodiments are all within the scope of protection of the present invention.

[0102] It is particularly important to note that in the following embodiments, the term "axial direction" is Figure 1 The term "longitudinal direction" refers to the direction parallel to the axial direction. The term "set pivot direction" refers to the direction parallel to the axial direction. Figure 1 The direction is indicated by the central axis W. The term "PE" refers to pulmonary embolism. The term "DVT" refers to deep vein thrombosis.

[0103] Please refer to Figures 1 to 39 A specific embodiment of an interventional catheter switching device, an interventional catheter and a method of using the same is disclosed. Figures 1 to 6As shown, in this embodiment, the interventional catheter switching device 1 includes: a main body 11, an inner tube 21 which is sleeved on the outside of the main body 11 and displaced in the longitudinal direction, and the side wall of the main body 11 at least partially forms a guide portion 111 for guiding the inner tube 21 to displace in the longitudinal direction when it rotates relative to the main body 11; at least one switching member 22 which is rotatably connected to the inner tube 21 is circumferentially embedded in the inner tube 21, and the switching member 22 forms a pivot axis 221 which is set at an angle to the longitudinal extension direction of the main body 11, and the switching member 22 is constructed to have a guide end 222 guided by the guide portion 111, and when any end of the switching member 22 in the longitudinal direction is subjected to force, the switching member 22 rotates around the pivot axis 221 to release the guiding state formed by the guide end 222 and the guide portion 111. When the guiding end 222 is engaged with the guiding portion 111, the guiding end 222 is guided by the guiding portion 111, and the guiding end 222 and the guiding portion 111 form a guiding state; when the guiding end 222 is separated from the guiding portion 111, the guiding state formed by the guiding end 222 and the guiding portion 111 is released, and the guiding end 222 and the guiding portion 111 are maintained in a separated state.

[0104] The guide end 222 and the guide portion 111 are kept as Figure 5 In the guiding state shown in , the inner tube 21 is controlled to rotate relative to the main tube body 11 around the axis P, and drives the switching member 22 to rotate circumferentially, so that the guide end 222 can be guided by the guide portion 111 during the circumferential rotation to be displaced in the longitudinal direction, and then the switching member 22 can synchronously drive the inner tube 21 to displace in the longitudinal direction. Therefore, in this guiding state, the inner tube 21 can be displaced in the longitudinal direction when rotating relative to the main tube body 11.

[0105] When any end of the switching member 22 along the longitudinal direction is subjected to force, the switching member 22 can Figure 4 The inner tube 21 rotates in the direction indicated by the middle arrow W1 to drive the guide end 222 to separate from the guide portion 111 and release the guiding state formed by the guide end 222 and the guide portion 111, thereby forming Figure 6 The switching member 22a and the guide portion 111 are in a separated state. In this separated state, the inner tube 21 can be directly controlled to be displaced longitudinally relative to the main tube 11, and the inner tube 21 can also be freely controlled to rotate axially.

[0106] Therefore, compared with the separation state, in the above-mentioned guiding state, the inner tube 21 can only be displaced in the longitudinal direction when it rotates relative to the main body 11. However, in the separation state, the inner tube 21 can be directly controlled to be displaced in the longitudinal direction without the need to control the rotation of the inner tube 21. Therefore, the speed of the inner tube 21 in the separation state when it is displaced in the longitudinal direction is greater than the speed of the inner tube 21 in the guiding state when it is displaced in the longitudinal direction, so the guiding state or the separation state can be selected to switch in actual use to achieve the control of the inner tube 21 to be displaced slowly or quickly in the longitudinal direction.

[0107] In this embodiment, preferably, when the switching member 22 is away from the guide end 222 and the end in the longitudinal direction (i.e., the switching end 223) is subjected to force, the switching member 22 rotates around the pivot shaft 221 to release the guiding state formed by the guide end 222 and the guide portion 111. Figure 4 The inner tube 21 rotates in the direction indicated by the middle arrow W1 to drive the guiding end 222 to separate from the guiding portion 111 and release the guiding state formed by the guiding end 222 and the guiding portion 111 .

[0108] Furthermore, when the switching member 22 is away from the guide end 222 and the end in the longitudinal direction (i.e., the switching end 223) is subjected to force, the guiding state formed by the guide end 222 and the guide portion 111 is released, and the guiding state is restored when the force on the end is removed. Figure 4 The inner tube 21 rotates in the direction indicated by the middle arrow W1 to drive the guide end 222 to disengage from the guide portion 111 and release the guiding state formed by the guide end 222 and the guide portion 111. When the force on the switching end 223 is removed, the guide end 222 engages with the guide portion 111 to restore to the guiding state.

[0109] For example, when the switching member 22 is away from the guide end 222 and the end in the longitudinal direction (i.e., the switching end 223) is subjected to force, the switching member 22 rotates around the pivot shaft 221 and keeps the guide end 222 and the guide portion 111 in a separated state. Figure 4 The inner tube 21 rotates in the direction indicated by the middle arrow W1 to drive the guide end 222 to disengage from the guide portion 111 and release the guiding state formed by the guide end 222 and the guide portion 111. The switching end 223 is continuously subjected to force so that the guide end 222 and the guide portion 111 are maintained in a separated state. When the guide end 222 is subjected to force to cancel the force on the switching end 223, the guide end 222 is engaged with the guide portion 111 to restore to the guiding state.

[0110] It should be noted that the above-mentioned control of the switching member 22 away from the guide end 222 and the end portion along the longitudinal direction (i.e., the switching end 223) to cause the switching member 22 to rotate around the pivot axis 221, release the guiding state formed by the guide end 222 and the guide portion 111, and keep the guide end 222 and the guide portion 111 in a separated state, and restore to the guiding state when the force on the switching end 223 is removed is exemplary. In some other embodiments of the present invention, the switching member 22 can also be rotated around the pivot axis 221 when the position of the switching member 22 close to the guide end 222 is subjected to force, release the guiding state formed by the guide end 222 and the guide portion 111, and keep the guide end 222 and the guide portion 111 in a separated state, and restore to the guiding state when the force on the switching end 223 is removed.

[0111] In this embodiment, preferably, Figures 1 to 3 and Figure 7 As shown, the guide portion 111 is configured as a spiral groove 1111 arranged in a spiral shape along the longitudinal direction around the side wall of the main body 11, and the inner tube 21 is synchronously displaced in the longitudinal direction when rotating relative to the main body 11. The guide end 222 can be guided by the spiral groove 1111 and perform a spiral motion in the longitudinal direction during the circumferential rotation. The guide end 222 is constructed with at least one guide block 2221 engaged with the spiral groove 1111. When the guide block 2221 is engaged with the spiral groove 1111, the guide end 222 and the guide portion 111 form a guiding state. In this guided state, the inner tube 21 is controlled to rotate axially relative to the main tube body 11 and synchronously drive the switching member 22 to rotate circumferentially. Since the guide block 2221 is engaged with the spiral groove 1111, the guide block 2221 can be guided by the spiral groove 1111 during the circumferential rotation and perform spiral motion in the longitudinal direction, so as to drive the inner tube 21 to synchronously displace in the longitudinal direction, thereby realizing the synchronous displacement of the inner tube 21 in the longitudinal direction when it rotates relative to the main tube body 11.

[0112] When any longitudinal end of the switching member 22 (for example, the switching end 223) is subjected to force, the switching member 22 rotates around the pivot shaft 221 to drive the guide block 2221 to disengage from the spiral groove 1111, thereby releasing the guiding state formed by the guide end 222 and the guide portion 111 and forming a separated state. In the separated state, the inner tube 21 can be directly controlled to be displaced longitudinally relative to the main tube 11, and the inner tube 21 can also be freely controlled to rotate axially to adjust the position of the guide block 2221. Therefore, when the force on the switching end 223 is removed, the position of the guide block 2221 relative to the spiral groove 1111 can be controlled by axially rotating the inner tube 21, so that the guide block 2221 can be accurately engaged in the spiral groove 1111 to restore to the guiding state.

[0113] For example, in some embodiments, Figure 8 and Fig. 9As shown, the guide portion 111 can also be configured as a spiral groove 1111a arranged in a spiral shape along the longitudinal direction around the side wall of the main body 11. The guide end 222 is constructed with a guide block 2221a that at least partially extends into the spiral groove 1111a. When the guide block 2221a is engaged with the spiral groove 1111a, the guide end 222 and the guide portion 111 form a guiding state. It should be noted that the spiral direction of the spiral groove 1111a forms an angle β with the radial line J direction of the main body 11, and the degree of the angle β is set to adjust the number of spiral turns formed by the spiral groove 1111a around the side wall of the main body 11. The larger the degree of the angle β, the fewer the number of spiral turns of the spiral groove 1111a, and the smaller the degree of the angle β, the more the number of spiral turns of the spiral groove 1111a.

[0114] In the guided state, Figure 7 The spiral groove 1111 in Figure 8 or Fig. 9 Taking the spiral groove 1111a in as an example, Figure 7 The angle β formed by the spiral direction of the middle spiral groove 1111 and the radial line J direction of the main body 11 is less than Figure 8 or Fig. 9 The spiral groove 1111a in the spiral groove 1111a forms an angle β with the radial line J direction of the main tube 11. Therefore, when the angle of rotation of the inner tube 21 around the axis P is the same, the movement component of the inner tube 21 driven by the longitudinal spiral motion of the guide block 2221a in the spiral groove 1111a is greater than the movement component of the inner tube 21 driven by the longitudinal spiral motion of the guide block 2221 in the spiral groove 1111.

[0115] Therefore, in the guided state and when the angle of rotation of the inner tube 21 around the axis P is the same, the larger the degree of the angle β and the smaller the number of spiral turns of the spiral groove 1111, the larger the movement component generated by the longitudinal displacement of the inner tube 21 when it rotates relative to the main body 11, and correspondingly the faster the speed of the inner tube 21 when it displaces along the longitudinal direction; the smaller the degree of the angle β and the larger the number of spiral turns of the spiral groove 1111, the smaller the movement component generated by the longitudinal displacement of the inner tube 21 when it rotates relative to the main body 11, and correspondingly the slower the speed of the inner tube 21 when it displaces along the longitudinal direction.

[0116] Therefore, in actual use, the angle β can be set to be greater than 0° and less than 90° to adjust the speed of the synchronous displacement in the longitudinal direction when the inner tube 21 rotates relative to the main tube 11 in the guiding state.

[0117] For example, in some embodiments, Figures 10 to 12As shown, the guide portion 111 is configured as a guide groove 1112 arranged in a spiral shape along the longitudinal direction around the side wall of the main body 11. When the inner tube 21 rotates relative to the main body 11, it is displaced in the longitudinal direction, and the guide groove 1112 forms at least one locking state that limits the longitudinal displacement of the inner tube 21 relative to the main body 11 when the inner tube 21 rotates relative to the main body 11. The guide end 222 can be guided by the guide groove 1112 and perform a spiral motion in the longitudinal direction during the circumferential rotation. The guide end 222 is constructed with a guide block 2221b that at least partially extends into the guide groove 1112. When the guide block 2221b is engaged with the guide groove 1112, the guide end 222 and the guide portion 111 form a guiding state. In this guiding state, the inner tube 21 is controlled to rotate axially relative to the main tube body 11 to synchronously drive the switching member 22 to rotate circumferentially. Since the guide block 2221b is engaged with the guide groove 1112, the guide block 2221b can be guided by the guide groove 1112 during the circumferential rotation and perform spiral motion in the longitudinal direction to drive the inner tube 21 to synchronously displace in the longitudinal direction, so as to achieve synchronous displacement of the inner tube 21 in the longitudinal direction when the inner tube 21 rotates relative to the main tube body 11. In addition, the guide groove 1112 forms at least one locking state that limits the longitudinal displacement of the inner tube 21 relative to the main tube body 11 when the inner tube 21 rotates relative to the main tube body 11.

[0118] When any longitudinal end of the switching member 22 (for example, the switching end 223) is subjected to force, the switching member 22 rotates around the pivot shaft 221 to drive the guide block 2221b to disengage from the guide groove 1112, thereby releasing the guiding state formed by the guide end 222 and the guide portion 111 and forming a separated state. In the separated state, the inner tube 21 can be directly controlled to be displaced longitudinally relative to the main body 11, and the inner tube 21 can also be freely controlled to rotate axially to adjust the position of the guide block 2221b. Therefore, when the force on the switching end 223 is removed, the position of the guide block 2221b relative to the guide groove 1112 can be controlled by axially rotating the inner tube 21, so that the guide block 2221b can be accurately engaged in the guide groove 1112 to restore to the guiding state.

[0119] Furthermore, if Fig.10 and Fig.11 As shown, the guide groove 1112 includes: a plurality of rotating grooves 11121 and movable grooves 11122 that are alternately distributed in the circumferential direction and the longitudinal direction; the rotating groove 11121 guides the inner tube 21 to rotate relative to the main body 11 and restricts the inner tube 21 from longitudinally displacing relative to the main body 11, and the movable groove 11122 guides the inner tube 21 to longitudinally displace relative to the main body 11. When the guide block 2221b is engaged with the rotating groove 11121, the inner tube 21 is controlled to rotate axially relative to the main body 11, and the guide block 2221b is synchronously driven to rotate in the rotating groove 11121 along the longitudinal direction. Fig.10 or Fig.11The inner tube 21 rotates in the direction indicated by the arrow P1 or the arrow P2, and the rotation groove 11121 can limit the longitudinal displacement of the guide block 2221b, so that the inner tube 21 can be locked relative to the main body 11 by limiting the longitudinal displacement of the inner tube 21 relative to the main body 11 when the inner tube 21 rotates relative to the main body 11. Fig.10 or Fig.11 Taking the rotation in the direction indicated by the middle arrow P1 as an example, the inner tube 21 can synchronously drive the guide block 2221b to rotate in the rotation groove 11121 along the direction indicated by the arrow P1 until the guide block 2221b rotates to the connection between the rotation groove 11121 and the movable groove 11122 to form Fig.10 or Fig.11 When the middle guide block 2221b1 is in the state shown, the inner tube 21 can be controlled to move along Fig.10 or Fig.11 The inner tube 21 is displaced longitudinally in the direction indicated by the middle arrow X1, so as to synchronously drive the guide block 2221b1 to displace rapidly longitudinally in the movable groove 11122, thereby realizing rapid longitudinal displacement of the inner tube 21 relative to the main tube 11.

[0120] It should be noted that the rotating groove 11121 is formed on the side wall of the main body 11 as shown in FIG. Fig.10 The arc length M1 shown in FIG. 1 is a portion of the arc length M2 shown in FIG. 1 , and the movable groove 11122 is formed on the side wall of the main body 11 as shown in FIG. Fig.10 The slot length M2 is shown in FIG.

[0121] In the guiding state, the larger the arc length M1 is, the larger the rotation component of the guide block 2221b in the rotating groove 11121 is, so that the rotation degree of the inner tube 21 relative to the main tube 11 is higher. Accordingly, the guide block 2221b is rotated to the connection between the rotating groove 11121 and the movable groove 11122 to form Fig.10 or Fig.11 The longer the rotation time required for the state shown by the middle guide block 2221b1, the longer the pre-operation time for the longitudinal displacement of the inner tube 21, and the slower the speed of the inner tube 21 displacing along the longitudinal direction when it rotates relative to the main body 11; conversely, the smaller the arc length M1, the lower the degree of rotation of the inner tube 21 relative to the main body 11, the shorter the pre-operation time for the longitudinal displacement of the inner tube 21, and the faster the speed of the inner tube 21 displacing along the longitudinal direction when it rotates relative to the main body 11.

[0122] The larger the groove length M2 is, the larger the displacement component of the inner tube 21 in the longitudinal direction is, and the smaller the groove length M2 is, the smaller the displacement component of the inner tube 21 in the longitudinal direction is. In the case where the displacement component required for the inner tube 21 to displace in the longitudinal direction is the same, the larger the groove length M2 is, the fewer pre-operation steps of the guide block 2221b rotating to the connection point between the rotating groove 11121 and the movable groove 11122 can be reduced, the smaller the groove length M2 is, the more pre-operation steps of the guide block 2221b rotating to the connection point between the rotating groove 11121 and the movable groove 11122 are increased, and the larger the groove length M2 is, the fewer pre-operation steps of the guide block 2221b rotating to the connection point between the rotating groove 11121 and the movable groove 11122 are reduced. In contrast, the smaller the groove length M2 is, the slower the speed of the inner tube 21 displacing in the longitudinal direction when rotating relative to the main body 11, and the larger the groove length M2 is, the faster the speed of the inner tube 21 displacing in the longitudinal direction when rotating relative to the main body 11.

[0123] Therefore, in actual use, the speed at which the inner tube 21 is displaced in the longitudinal direction when rotating relative to the main tube 11 can be adjusted by setting the arc length M1 and the slot length M2.

[0124] For example, in some embodiments, Fig.12 As shown, the guide groove 1112 includes: a plurality of rotating grooves 11121 and movable grooves 11122 that are alternately distributed in the circumferential direction and the longitudinal direction, and a plurality of spiral guide grooves 11123 that connect the rotating grooves 11121 and / or the movable grooves 11122 and extend in a spiral shape; the rotating grooves 11121 guide the inner tube 21 to rotate relative to the main body 11 and limit the longitudinal displacement of the inner tube 21 relative to the main body 11, the movable grooves 11122 guide the inner tube 21 to displace longitudinally relative to the main body 11, and the rotating guide grooves 11123 guide the inner tube 21 to synchronously displace longitudinally when rotating relative to the main body 11. It should be noted that the rotating guide grooves 11123 can also be arranged in a spiral shape along the longitudinal direction on the side wall of the main body 11 and formed between the rotating grooves 11121 and the movable grooves 11122, and the two end portions of the rotating guide grooves 11123 are respectively connected to the rotating grooves 11121 and the movable grooves 11122. In the guiding state, taking the connecting groove 11123 to the rotating groove 11121 as an example, the inner tube 21 rotates axially to drive the guide block 2221b to move into the rotating groove 11123 and form the following Fig.12 When the middle guide block 2221b1 is in the state shown, the inner tube 21 is controlled to rotate axially to synchronously drive the guide block 2221b1 to perform spiral motion in the longitudinal direction in the spiral guide groove 11123, so as to achieve synchronous displacement of the inner tube 21 in the longitudinal direction when the inner tube 21 rotates relative to the main tube body 11. It should be noted that the degree of the angle formed by the spiral direction of the spiral guide groove 11123 and the radial direction of the main tube body 11 can also be set to adjust the speed of synchronous displacement of the inner tube 21 in the longitudinal direction when the inner tube 21 rotates relative to the main tube body 11 in the guiding state.

[0125] like Figures 1 to 12 As shown, in the guiding state, the inner tube 21 is controlled to rotate axially relative to the main tube body 11 to synchronously drive the switching member 22 to rotate circumferentially around the axis P. Since the guide end 222 is engaged with the guide portion 111, when the guide block 2221 (or the guide block 2221a / the guide block 2221b1) is guided by the spiral groove 1111 (or the spiral groove 1111a / the spiral guide groove 11123) and performs a spiral motion in the longitudinal direction to drive the inner tube 21 to synchronously displace in the longitudinal direction, the displacement component of the inner tube 21 in the longitudinal direction depends on the rotation angle of the inner tube 21 in the axial rotation relative to the main tube body 11. However, when the guide block 2221b1 is displaced in the longitudinal direction in the movable groove 11122 to drive the inner tube 21 to synchronously displace in the longitudinal direction, the displacement component of the inner tube 21 in the longitudinal direction depends on the size of the groove length M2 of the movable groove 11122.

[0126] Therefore, the control accuracy of the synchronous displacement of the inner tube 21 along the longitudinal direction driven by the rotational transmission mode of the guide block 2221 (or guide block 2221a / guide block 2221b1) and the spiral groove 1111 (or spiral groove 1111a / rotational groove 11123) is higher than the control accuracy of the synchronous displacement of the inner tube 21 along the longitudinal direction driven by the longitudinal transmission mode of the guide block 2221b1 and the movable groove 11122.

[0127] Therefore, in this embodiment, preferably, the guide portion 111 is configured as a spiral groove 1111 arranged in a spiral shape along the longitudinal direction around the side wall of the main body 11, so as to improve the displacement accuracy of the synchronous displacement along the longitudinal direction when the inner tube 21 rotates relative to the main body 11 in the guiding state formed by the guide end 222 and the guide portion 111.

[0128] In this embodiment, preferably, the guide portion 111 at least partially extends into the side wall of the main body 11. In some embodiments, the guide portion 111 may also completely penetrate the side wall of the main body 11, as long as the inner tube 21 can be axially rotated relative to the main body 11, and in the guiding state, the guide portion 111 can guide the guide end 222.

[0129] like Figures 13 to 15 As shown, in this embodiment, the pivot shaft 221 is composed of a support end 2211 protrudingly arranged along the set pivot direction formed by the pivot shaft 221 of the switching member 22, and the inner tube 21 forms a first pivot portion that receives the support end 2211 so that the switching member 22 can rotate along the pivot direction. Preferably, the first pivot portion is configured as a base 212 that receives the support end 2211, and the base 212 can support the support end 2211 to rotate relative to the inner tube 21 around the axis W. In some embodiments, as Fig.16As shown, the first pivoting portion may also be configured to receive the first rotating hole 212 a of the abutting end 2211 , so that the abutting end 2211 can be rotatably engaged in the first rotating hole 212 a , thereby enabling the switching member 22 to rotate around the axis W relative to the inner tube 21 .

[0130] For example, in some embodiments, Fig.17 As shown, the pivot shaft 221 is composed of the inner tube 21 protruding along the set pivot direction formed by the pivot shaft 221 and at least partially extending into the support end 213 of the switching member 22, and the switching member 22 forms a second pivot portion that receives the support end 213 for the switching member 22 to rotate along the pivot direction. The second pivot portion is configured as a second rotation hole 2212 that receives the support end 213, so that the support end 213 can be rotatably engaged in the second rotation hole 2212, so that the switching member 22 can rotate around the axis W relative to the inner tube 21.

[0131] For example, in some embodiments, Fig.18 As shown, the pivot axis 221 is composed of a pivot assembly in which the switching member 22 and the inner tube 21 are mutually embedded in a set pivot direction formed by the pivot axis 221 and the switching member 22 is rotated in the pivot direction. The pivot assembly includes: a first protruding end 2213 and a second protruding end 214 formed by the switching member 22 and the inner tube 21 protruding in the same direction along the pivot direction, respectively, and a third pivot part and a fourth pivot part formed by the inner tube 21 and the switching member 22 to receive the first protruding end 2213 and the second protruding end 214, respectively, so that the switching member 22 can rotate in the pivot direction. The third pivot portion is configured to accommodate the third rotation hole 215 of the first protruding end 2213, so that the first protruding end 2213 can be rotatably engaged in the third rotation hole 215; the fourth pivot portion is configured to accommodate the fourth rotation hole 2214 of the second protruding end 214, so that the second protruding end 214 can be rotatably engaged in the fourth rotation hole 2214; thereby, the switching member 22 can rotate around the axis W relative to the inner tube 21.

[0132] Figures 16 to 18 The abutting end 2211 and the base 212 , the supporting end 213 and the second rotating hole 2212 , and the pivot assembly shown in the figure are exemplary. In other embodiments of the present invention, the switching member 22 and the inner tube 21 may be connected by any suitable pivot structure.

[0133] like Figure 1 As shown, the axis W direction of the pivot shaft 221 forms a set angle α with the longitudinal extension direction of the main body 11 (i.e., the direction shown by the axis P), and the angle α is greater than 0° and less than 180°. In this embodiment, the angle α is preferably 90°, and the axis W direction of the pivot shaft 221 forms a right angle with the axis P direction of the main body 11. As long as the pivot direction of the pivot shaft 221 (i.e., the axis W direction) is not parallel to the longitudinal extension direction of the main body 11, it is acceptable.

[0134] In this embodiment, preferably, Figures 19 to 21 As shown, the interventional catheter switching device 1 also includes: an outer tube 23 coaxially sleeved on the outer side of the inner tube 21 and surrounding the switching member 22, the inner tube 21 radially protrudes outward to form an outer plate 211, and a first elastic member 27 clamped between the outer plate 211 and the outer tube 23; the side wall of the outer tube 23 radially protrudes inward to form a protrusion 231 that abuts against the guide end 222, and the first elastic member 27 forms an elastic biasing force along the longitudinal direction on the outer tube 23 to maintain the guiding state between the guide end 222 and the guide portion 111. Fig.25 As shown, the outer tube 23 is formed with a sliding side wall 2301 that partially fits with the side wall of the inner tube 21, so that the sliding side wall 2301 can fit and slide along the side wall of the inner tube 21, thereby improving the smoothness of the outer tube 23 performing longitudinal displacement on the outside of the inner tube 21. The outer tube 23 and the outer plate 211 are respectively connected to the two ends of the first elastic member 27 in the longitudinal direction. The first elastic member 27 can be set as a spring, and the elastic biasing force of the spring (that is, the preload force of the first elastic member 27 when it is not stretched or compressed, also called the basic tension) can play a longitudinal supporting role on the outer tube 23, so that the outer tube 23 can maintain the same Fig. 20 The protrusion 231 shown in FIG. 1 abuts against the guide end 222 , thereby maintaining a guiding state between the guide end 222 and the guide portion 111 .

[0135] The outer tube 23 is subjected to stress along Fig.21 When the longitudinal displacement occurs in the direction indicated by the middle arrow X2, the protrusion 231 will be synchronously driven to move longitudinally and compress the first elastic member 27. The protrusion 231 will abut against the switching end 223 during the longitudinal displacement to drive the switching member 22a to move along the Fig.21 The inner tube 21 is rotated in the direction indicated by W1, so that the guide end 222 is separated from the guide portion 111, thereby releasing the guiding state formed by the guide end 222 and the guide portion 111, and forming Fig.21 In the separation state shown by the middle switching member 22 a , the outer tube 23 is continuously subjected to force so that the guide end 222 and the guide portion 111 are kept in a separation state, thereby facilitating the control of the longitudinal displacement of the inner tube 21 relative to the main tube 11 .

[0136] When the outer tube 23 is freed from the force, the first elastic member 27 is stretched to release the accumulated elastic potential energy and form an elastic force, which can drive the outer tube 23 to move along the Fig. 20 The switching member 22 moves longitudinally in the direction indicated by the middle arrow X1, and drives the protruding portion 231 to move longitudinally, so that the protruding portion 231 abuts against the guiding end 222, thereby driving the switching member 22 to move longitudinally. Fig. 20 The inner tube 21 is rotated in the direction indicated by W2, so that the guide end 222 is engaged with the guide portion 111 to restore the inner tube 21. Fig. 20Therefore, the elastic biasing force provided by the first elastic member 27 to the outer tube 23 can maintain the guiding state between the guiding end 222 and the guiding portion 111, so that in the guiding state, the inner tube 21 can be synchronously displaced in the longitudinal direction when rotating relative to the main tube 11.

[0137] Furthermore, the outer tube 23 is constructed with a groove 232, and the groove 232 at least partially accommodates the switching end 223 formed by the end of the switching member 22 away from the guide end 222 and in the longitudinal direction, and the groove 232 forms a guide annular surface 233 connected to the protrusion 231. The outer tube 23 is displaced in the longitudinal direction to drive the guide annular surface 233 to drive the switching end 223, and the switching member 22 rotates around the pivot shaft 221 to release the guiding state formed between the guide end 222 and the guide portion 111 before the guide annular surface 233 contacts the switching end 223. The switching end 223 is at least partially accommodated by the groove 232, so that when the outer tube 23 rotates in the axial direction, it can drive the switching member 22 located in the groove 232 to rotate circumferentially, thereby driving the inner tube 21 to realize axial rotation. When the outer tube 23 rotates in the axial direction, the switching member 22 in the groove 232 can be driven to rotate circumferentially, thereby driving the inner tube 21 to realize axial rotation. Fig.21 When the longitudinal displacement occurs in the direction indicated by the middle arrow X2, the guide ring surface 233 contacts the switching end 223, so that the protrusion 231 can smoothly abut the guide end 222 and drive the switching member 22a to move along the Fig.21 The direction indicated by W1 in the figure rotates relative to the inner tube 21, thereby increasing the rotation of the outer tube 23 along the Fig.21 In some embodiments, the guide annular surface 233 can be configured as a plane or a curved surface, as long as it can guide the switching end 223 to drive the switching member 22a along the Fig.25 The direction indicated by W1 can be rotated relative to the inner tube 21.

[0138] For example, in some embodiments, Figure 22 to Figure 25 As shown, the interventional catheter switching device 1 also includes: an outer tube 23 coaxially sleeved on the outside of the inner tube 21 and surrounding the switching member 22, a movable rod 24 penetrating the side wall of the outer tube 23, a transmission rod 25 rotatably connected with the switching end 223 formed by the end of the switching member 22 away from the guide end 222, one end of the movable rod 24 extending into the side wall of the outer tube 23 is rotatably connected with the end of the transmission rod 25 away from the switching end 223, one end of the movable rod 24 extending out of the side wall of the outer tube 23 is radially protruded outward to form a top cover 241, and a second elastic member 26 clamped between the side wall of the outer tube 23 and the top cover 241; the second elastic member 26 forms an elastic force on the top cover 241 along the penetration direction of the movable rod 24 penetrating the side wall of the outer tube 23, so as to maintain the guiding state formed between the guide end 222 and the guide portion 111. The movable rod 24 penetrates the side wall of the outer tube 23 and can prevent the outer tube 23 from axially rotating relative to the inner tube 21 , so as to improve the consistency of synchronous rotation or longitudinal displacement of the outer tube 23 and the inner tube 21 .

[0139] The second elastic member 26 can be set as a spring, through the elastic force of the spring (that is, the force released by the second elastic member 26 when it is stretched), it can exert a supporting effect on the top cover 241 along the penetration direction of the movable rod 24 through the side wall of the outer tube 23, or the elastic biasing force of the second elastic member 26 exerts a supporting effect on the top cover 241 along the penetration direction of the movable rod 24 through the side wall of the outer tube 23, so as to achieve the guiding state between the guide end 222 and the guide part 111.

[0140] When the top cover 241 is forced to move downward along the Z axis, it will synchronously drive the movable rod 24 to move downward along the Z axis and compress the second elastic member 26, and the movable rod 24 will synchronously drive the transmission rod 25 to apply a downward pressure on the switching end 223 to drive the switching member 22 to move downward along the Z axis. Fig.24 The inner tube 21 rotates in the direction indicated by W1 until the guide end 222 is separated from the guide portion 111, thereby releasing the guiding state formed by the guide end 222 and the guide portion 111 and forming Fig.24 The separation state shown by the middle switching member 22a is achieved by controlling the top cover 241 to be continuously stressed so that the guide end 222 and the guide portion 111 are maintained in a separation state, thereby facilitating the control of the longitudinal displacement of the outer tube 23 relative to the main tube body 11. At the same time, the outer tube 23 will synchronously drive the inner tube 21 to move longitudinally through the movable rod 24, the transmission rod 25 and the switching member 22.

[0141] When the top cover 241 is freed from stress, the second elastic member 26 is stretched to release the accumulated elastic potential energy to form an elastic force, which drives the top cover 241 to move upward along the Z axis and drives the movable rod 24 to move upward along the Z axis, so that the movable rod 24 synchronously drives the transmission rod 25 to apply an upward force to the switching end 223, so as to drive the switching member 22 to move upward along the Z axis. Fig.23 The inner tube 21 is rotated in the direction indicated by W2, so that the guide end 222 is engaged with the guide portion 111 to restore the inner tube 21. Fig.23 The guiding state shown by the switching member 22 in the middle. Therefore, the second elastic member 26 provides an elastic force to the top cover 241 along the penetration direction of the movable rod 24 penetrating the side wall of the outer tube 23 to achieve the formation of a guiding state between the guide end 222 and the guide portion 111, so that in this guiding state, the inner tube 21 can be synchronously displaced in the longitudinal direction when rotating relative to the main tube 11. It should be noted that the second elastic member 26 can also provide an elastic biasing force (i.e., the pre-tightening force of the second elastic member 26 when it is not stretched or compressed, also called the basic tension) to the top cover 241 along the penetration direction of the movable rod 24 penetrating the side wall of the outer tube 23 to achieve the formation of a guiding state between the guide end 222 and the guide portion 111.

[0142] For example, in some embodiments, Figures 4 to 6 As shown, the pivot shaft 221 and the inner tube 21 are provided with a pair of torsion members (not shown) that apply torsion force to the guide end 222 to maintain the guiding state between the guide end 222 and the guide portion 111. The torsion member (not shown) is specifically a torsion spring (not shown), which is positioned on the pivot shaft 221, one end of the torsion spring is positioned on the guide end 222, and the other end abuts on the switching end 223. When the switching end 223 is subjected to force, it will drive the switching member 22 to move along the guide end 222. Figure 4 The inner tube 21 rotates in the direction indicated by the middle arrow W1, and the guide end 222 is separated from the guide portion 111 to form Figure 6 In the separated state shown by the switching member 22a, the switching end 223 is continuously stressed so that the guide end 222 and the guide portion 111 are kept separated, thereby facilitating the control of the longitudinal displacement of the inner tube 21 relative to the main tube 11. When the switching end 223 is freed from stress, a torsion force is applied to the guide end 222 by a torsion member (not shown), driving the switching member 22 to move along the longitudinal direction. Figure 4 The inner tube 21 rotates in the direction indicated by the middle arrow W2, so that the guide end 222 is engaged with the guide portion 111 to restore to Figure 5 In the guiding state shown by the middle switching member 22, a torsion force is applied to the guiding end 222 by a torsion member (not shown) to achieve a guiding state between the guiding end 222 and the guiding portion 111, so that in this guiding state, the inner tube 21 can be synchronously displaced in the longitudinal direction when it rotates relative to the main tube 11.

[0143] like Fig.26 and Fig.38 As shown, based on the technical solution of an interventional catheter switching device 1 disclosed in the aforementioned embodiment, this embodiment further discloses an interventional catheter 2.

[0144] The interventional catheter 2 includes: an interventional catheter switching device 1 as disclosed in the above-mentioned embodiment, a guide tube 60 axially penetrating the interventional catheter switching device 1, a basket assembly 70 formed at the end of the guide tube 60, and a transmission assembly 30 arranged on the interventional catheter switching device 1; the interventional catheter switching device 1 drives the transmission assembly 30 to displace longitudinally to drive the basket assembly 70 to expand or contract. A guide wire (not shown) is arranged in the guide tube 60, and under the guidance of the guide wire, the guide tube 60 enters the patient's blood vessel and inserts the basket assembly 70 into the lesion (i.e., the embolic position where a thrombus is formed in the blood vessel), and selects a guiding state or a separation state according to the different positions of the thrombus formed in the patient's blood vessel (such as PE, DVT, etc.) to control the basket assembly 70 to achieve slow release or fast release. By controlling the interventional catheter switching device 1 to drive the transmission assembly 30 along Fig.26 The longitudinal displacement occurs in the direction indicated by the middle arrow X1, so as to drive the basket assembly 70 to release quickly or slowly and finally form Fig.26The released state shown in the figure enables the basket assembly 70 to open the blood vessel to establish a blood flow path and perform thrombolytic therapy on the lesion. Fig.26 A longitudinal displacement occurs in the direction indicated by the middle arrow X2 to drive the basket assembly 70 to contract, thereby facilitating the movement of the basket assembly 70 in the blood vessel.

[0145] For example, in the treatment process of pulmonary embolism, it is necessary to slowly release the basket component 70 so that the basket component 70 slowly expands, thereby slowly stretching the blood vessels for thrombolytic therapy, and prevent the basket component 70 from being released too quickly and expanding too much, causing the basket component 70 to over-stretch the blood vessels, which is easy to damage the blood vessel wall and stimulate the heart; when the embolism area is large or in the treatment process of deep vein thrombosis of the lower limbs, it is necessary to quickly establish a blood flow path to clear the embolic blood vessels, control the basket component 70 to insert into the embolism area, quickly release the basket component 70, quickly release the basket component 70, and quickly expand the basket component 70. During the expansion process, the thrombus is squeezed and cut, and the larger volume of the thrombus is broken into multiple smaller thrombi, so that the blood circulation in the blood vessels is restored, so as to quickly establish a blood flow path to clear the embolic blood vessels, and increase the contact area between the released basket component 70 and the thrombus to form an all-round contact, increase the exposure area of ​​the thrombus, improve the efficiency of the basket component 70 in dissolving the thrombus, and avoid affecting the thrombolytic therapy effect.

[0146] like Fig.26 As shown, the interventional catheter 2 further includes: a base 50 supporting the interventional catheter switching device 1, the base 50 includes at least one wing plate 51 that fits the human limb, and the wing plate 51 forms a through hole 52. By fitting the wing plate 51 to the human limb, optionally, an elastic rope (not shown) is used to pass through the through hole 52, so that the base 50 is tied and fixed to the patient's limb, so as to fix the interventional catheter 2.

[0147] Specifically, Figure 26 to Figure 29 As shown, the transmission assembly 30 includes: an active snap ring 31 sleeved on the outside of the main body 11 and driven by the interventional catheter switching device 1, a transmission tube 32 axially arranged inside the main body 11 and connected to the active snap ring 31, and an active tube 33 longitudinally embedded at the front end of the transmission tube 32 and extending out of the main body 11; the active tube 33 is sleeved on the outside of the guide tube 60 and connected to the basket assembly 70, and the active snap ring 31 is longitudinally displaced relative to the main body 11 to drive the active tube 33 to drive the basket assembly 70 to expand or contract. The active snap ring 31 is driven to longitudinally displace relative to the main body 11 by the interventional catheter switching device 1, and the transmission tube 32 and the active tube 33 are synchronously driven to longitudinally displace by the active snap ring 31, so that the active tube 33 can longitudinally displace outside the guide tube 60 to drive the basket assembly 70 to expand or contract.

[0148] Furthermore, if Fig.28 and Fig.29 As shown, the transmission assembly 30 also includes: a connecting element 34 that drives the movable snap ring 31 to move longitudinally relative to the main body 11; the transmission tube 32 is radially outwardly protruded to form a plurality of first transmission blocks 321 that penetrate the side wall of the main body 11 and at least partially extend into the movable snap ring 31; the side wall of the main body 11 is formed with a plurality of guide grooves 115 that are longitudinally distributed and used to guide the longitudinal displacement of the first transmission block 321. The guide groove 115 penetrates the side wall of the main body 11 in the radial direction to improve the stability of guiding the first transmission block 321 to move longitudinally. During the process of longitudinal displacement, the movable snap ring 31 will synchronously drive the transmission tube 32 to move through the first transmission block 321, so that the transmission tube 32 drives the movable tube 33 to move longitudinally, so that the movable tube 33 can move longitudinally outside the guide tube 60 to drive the basket assembly 70 to expand or contract.

[0149] In this embodiment, preferably, Figure 26 to Figure 29 and Fig.34 As shown, the connecting element 34 is configured as an outer shell 341 circumferentially arranged around the inner tube 21 and the outer tube 23 and circumferentially separated from the main tube 11; the movable snap ring 31 is radially inwardly recessed to form a receiving groove 311, and the outer shell 341 is constructed with a rotating end 3411 that at least partially extends radially into the receiving groove 311 to allow the outer shell 341 to axially rotate relative to the main tube 11; the outer shell 341 forms an extension wall 3412 that longitudinally supports the two ends of the inner tube 21, and the outer tube 23 is constructed with a pusher 234 that penetrates the side wall of the outer shell 341 and is formed on the outside of the outer shell 341, and the side wall of the outer shell 341 is provided with an open groove 3413 for guiding the longitudinal displacement of the pusher 234. Fig.28 In the embodiment, when the guiding state formed between the guiding end 222 and the guiding portion 111 is maintained by the elastic biasing force of the first elastic member 27, the outer housing 341 is controlled to rotate relative to the main body 11, and the pushing member 234 is driven to rotate the outer tube 23 synchronously, and the outer tube 23 will synchronously drive the inner tube 21 to rotate through the switching member 22, and the inner tube 21 rotates relative to the main body 11 along the Fig.26 The inner tube 21 can synchronously drive the outer shell 341 along the direction indicated by the arrow X1. Fig.26 The movable snap ring 31 is longitudinally displaced in the direction indicated by the middle arrow X1. As the rotating end 3411 rotates in the receiving groove 311, the movable snap ring 31 can support the outer shell 341 to rotate axially, so that the outer shell 341 can synchronously drive the movable snap ring 31 along the direction indicated by the middle arrow X1. Fig.26 Longitudinal displacement occurs in the direction indicated by the middle arrow X1.

[0150] When the control pusher 234 drives the outer tube 23 along Fig.26When the longitudinal displacement occurs in the direction indicated by the middle arrow X2, the outer tube 23 synchronously drives the protruding portion 231 to abut against the switching end 223, so that the switching member 22a moves along Fig.21 The inner tube 21 rotates in the direction indicated by W1, so that the guide end 222 is separated from the guide portion 111, thereby releasing the guiding state formed by the guide end 222 and the guide portion 111, and forming Fig.21 The push member 234 is controlled to make the protrusion 231 continue to abut against the guide end 222, so that the guide end 222 and the guide portion 111 are kept in a separated state, and then the outer shell 341 is controlled to move along the guide end 222. Fig.26 The longitudinal displacement occurs in the direction indicated by the middle arrow X1, and the movable snap ring 31 is simultaneously driven to move along the Fig.26 Longitudinal displacement occurs in the direction indicated by the middle arrow X1.

[0151] In the above guiding state, the outer shell 341 drives the movable snap ring 31 along Fig.26 The speed of the longitudinal displacement in the direction indicated by the middle arrow X1 is less than that of the outer shell 341 driving the movable snap ring 31 along the separation state. Fig.26 The speed of longitudinal displacement in the direction indicated by the middle arrow X1 is higher than the control accuracy of the outer shell 341 driving the movable clasp 31 to move longitudinally in the guiding state. Therefore, the guiding state or the detached state can be selected according to the different positions of thrombus formation in the patient's blood vessels to control the basket assembly 70 to achieve slow release or fast release.

[0152] Therefore, the guiding state or the separation state can be selected according to the different positions of the thrombus formed in the patient's blood vessel to control the outer shell 341 to drive the active clamp ring 31 along the Fig.26 A slow longitudinal displacement or a fast longitudinal displacement occurs in the direction indicated by the middle arrow X1, so that the movable clamping ring 31 synchronously drives the movable tube 33 to perform a slow or fast displacement outside the guide tube 60, so as to drive the basket assembly 70 to achieve a slow release or a fast release, thereby avoiding affecting the thrombolytic therapy effect.

[0153] For example, in some embodiments, Figures 2 to 6 , Fig.30 and Fig.34As shown, the connecting element 34 is configured as a connecting shell 342 that is axially sleeved on the outside of the main body 11 and connected to the inner tube 21; the movable snap ring 31 is radially inwardly recessed to form a receiving groove 311, and the connecting shell 342 is constructed with a connecting end 3421 that at least partially extends radially into the receiving groove 311, so that the connecting shell 342 can axially rotate relative to the main body 11. When a pair of guide ends 222 are configured through the pivot shaft 221 and the inner tube 21 to apply a torsion force (not shown), so as to maintain a guiding state between the guide end 222 and the guide portion 111, the inner tube 21 can be controlled to rotate along the same direction as the main body 11. Fig.26 The longitudinal displacement occurs synchronously in the direction indicated by the middle arrow X1, so as to drive the connecting shell 342 to move along the Fig.26 The connecting end 3421 rotates in the receiving groove 311, so that the movable snap ring 31 can support the axial rotation of the connecting shell 342, so that the connecting shell 342 can synchronously drive the movable snap ring 31 along the direction indicated by the middle arrow X1. Fig.26 Longitudinal displacement occurs in the direction indicated by the middle arrow X1.

[0154] When the switching end 223 is subjected to force, Figure 6 In the separation state shown by the switching member 22a, the switching end 223 is continuously subjected to force so that the guide end 222 and the guide portion 111 are kept in a separation state, thereby facilitating the control of the inner tube 21 relative to the main tube 11 along the Fig.26 The longitudinal displacement occurs in the direction indicated by the middle arrow X1, so as to drive the connecting shell 342 to move the movable snap ring 31 along the Fig.26 Synchronous longitudinal displacement occurs in the direction indicated by the middle arrow X1.

[0155] Therefore, the guiding state or the separation state can be selected according to the different positions of the thrombus formed in the patient's blood vessels to control the inner tube 21 to drive the active clamp ring 31 along the Fig.26 A slow longitudinal displacement or a fast longitudinal displacement occurs in the direction indicated by the middle arrow X1, so that the movable clamping ring 31 synchronously drives the movable tube 33 to perform a slow or fast displacement outside the guide tube 60, so as to drive the basket assembly 70 to achieve a slow release or a fast release, thereby avoiding affecting the thrombolytic therapy effect.

[0156] For example, in some embodiments, Figure 22 to Figure 24 , Fig.31 and Fig.34 As shown, the connecting element 34 is configured as a connecting shell 342 axially sleeved on the outside of the main body 11 and connected to the inner tube 21, and the connecting element 34 is longitudinally separated from the outer tube 23. When the elastic force of the second elastic member 26 is used to maintain the guiding state formed between the guide end 222 and the guide portion 111, the outer tube 23 can be controlled to rotate relative to the main body 11 along the Fig.26 The longitudinal displacement occurs in the direction indicated by the middle arrow X1, so as to drive the connecting shell 342 to move along Fig.26 The connecting end 3421 rotates in the receiving groove 311, so that the movable snap ring 31 can support the axial rotation of the connecting shell 342, so that the connecting shell 342 can synchronously drive the movable snap ring 31 along the direction indicated by the middle arrow X1. Fig.26 Longitudinal displacement occurs in the direction indicated by the middle arrow X1.

[0157] At the top cover 241, the force is Fig.24 When the longitudinal displacement occurs in the direction indicated by N2, the guiding state formed by the guiding end 222 and the guiding portion 111 is released, and a Fig.24 When the switching member 22a is in the separated state, the control cover 241 is continuously stressed so that the guide end 222 and the guide portion 111 are kept in the separated state, so as to control the outer tube 23 to move relative to the main tube 11 along the Fig.26 The outer tube 23 will move longitudinally in the direction indicated by the middle arrow X1, and at the same time, the outer tube 23 will synchronously drive the movable clamping ring 31 along the connecting shell 342. Fig.26 The longitudinal displacement is carried out in the direction indicated by the arrow X1.

[0158] Therefore, the guiding state or the separation state can be selected according to the different positions of the thrombus formed in the patient's blood vessels to control the outer tube 23 to drive the active clamp ring 31 along the Fig.26 A slow longitudinal displacement or a fast longitudinal displacement occurs in the direction indicated by the middle arrow X1, so that the movable clamping ring 31 synchronously drives the movable tube 33 to perform a slow or fast displacement outside the guide tube 60, so as to drive the basket assembly 70 to achieve a slow release or a fast release, thereby avoiding affecting the thrombolytic therapy effect.

[0159] For example, in some embodiments, Figures 2 to 6 , Fig.32 and Fig.35 As shown, the movable snap ring 31 is sleeved on a part of the inner tube 21, and the connecting element 34 is configured as a connecting protrusion 343 formed by the end of the inner tube 21 close to the movable snap ring 31 and radially protruding outward, and the connecting protrusion 343 at least partially extends into the movable snap ring 31; the movable snap ring 31 forms a second annular cavity 313 circumferentially arranged outside the connecting protrusion 343, so that the inner tube 21 can axially rotate relative to the movable snap ring 31. When a pair of guide ends 222 are configured through the pivot shaft 221 and the inner tube 21 to apply a torsion force (not shown), so as to maintain a guiding state between the guide end 222 and the guide portion 111, the inner tube 21 can be controlled to rotate along the guide end 222 when it rotates relative to the main body 11. Fig.26The inner tube 21 is synchronously displaced longitudinally in the direction indicated by the middle arrow X1, and the engaging protrusion 343 is synchronously driven to rotate in the second annular cavity 313 while the inner tube 21 rotates, so that the inner tube 21 can realize axial rotation relative to the movable snap ring 31 through the second annular cavity 313, so as to avoid driving the movable snap ring 31 to rotate synchronously, thereby facilitating the smooth axial rotation of the inner tube 21 relative to the movable snap ring 31, so as to drive the movable snap ring 31 along the second annular cavity 313 through the engaging protrusion 343. Fig.26 The connecting protrusion 343 can be configured as follows: Fig.35 The annular structure shown in the figure may also be configured as a plurality of protrusions (not shown) circumferentially distributed at the end of the inner tube 21 , as long as they can rotate in the second annular cavity 313 .

[0160] When the switching end 223 is subjected to force, Figure 6 In the separation state shown by the switching member 22a, the switching end 223 is continuously subjected to force so that the guide end 222 and the guide portion 111 are kept in a separation state, thereby facilitating the control of the inner tube 21 relative to the main tube 11 along the Fig.26 The movable snap ring 31 is longitudinally displaced in the direction indicated by the middle arrow X1, so as to drive the movable snap ring 31 along the connecting protrusion 343. Fig.26 Synchronous longitudinal displacement occurs in the direction indicated by the middle arrow X1.

[0161] Therefore, the guiding state or the separation state can be selected according to the different positions of the thrombus formed in the patient's blood vessels to control the inner tube 21 to drive the active clamp ring 31 along the Fig.26 A slow longitudinal displacement or a fast longitudinal displacement occurs in the direction indicated by the middle arrow X1, so that the movable clamping ring 31 synchronously drives the movable tube 33 to perform a slow or fast displacement outside the guide tube 60, so as to drive the basket assembly 70 to achieve a slow release or a fast release, thereby avoiding affecting the thrombolytic therapy effect.

[0162] For example, in some embodiments, Figures 2 to 6 , Fig.33 and Fig.36As shown, the transmission tube 32 is radially protruded outward to form a plurality of second transmission blocks 322 that penetrate the side wall of the main body 11 and at least partially extend into the movable snap ring 31. The movable snap ring 31 forms a first annular cavity 312 circumferentially arranged on the outside of the second transmission block 322, so that the movable snap ring 31 can rotate axially relative to the second transmission block 322. The side wall of the main body 11 forms a plurality of guide grooves 115 that are longitudinally distributed and used to guide the longitudinal displacement of the second transmission block 322. The inner tube 21 is fixedly connected to the movable snap ring 31. When the inner tube 21 rotates relative to the main body 11, it synchronously drives the movable snap ring 31 to rotate and displace in the longitudinal direction, so as to synchronously drive the second transmission block 322 so that the transmission tube 32 drives the movable tube 33 to displace in the longitudinal direction, thereby driving the basket assembly 70 to expand or contract. By configuring a pair of torsion members (not shown) for applying torque at the guide ends 222 through the pivot shaft 221 and the inner tube 21 to maintain a guiding state between the guide ends 222 and the guide portion 111, the inner tube 21 is controlled to rotate relative to the main tube body 11 around the axis P to synchronously drive the movable snap ring 31 to rotate axially and drive the switching member 22 to rotate circumferentially, so that the switching member 22 can be guided by the guide portion 111 during the circumferential rotation and thus displaced in the longitudinal direction, so that the inner tube 21 can be synchronously displaced in the longitudinal direction during the rotation, and the movable snap ring 31 can be synchronously driven to displace in the longitudinal direction through the inner tube 21, so that the movable snap ring 31 can synchronously drive the second transmission block 322 during the longitudinal displacement to cause the transmission tube 32 to drive the movable tube 33 to displace in the longitudinal direction, thereby driving the basket assembly 70 to expand or contract. When the movable snap ring 31 is synchronously driven by the inner tube 21 to perform axial rotation, the movable snap ring 31 can realize axial rotation relative to the second transmission block 322 through the first annular cavity 312, and the matching guide groove 115 can limit the axial rotation of the second transmission block 322, so that the movable snap ring 31 can smoothly perform axial rotation.

[0163] Therefore, the guiding state or the separation state can be selected according to the different positions of the thrombus formed in the patient's blood vessels to control the outer tube 23 to drive the active clamp ring 31 along the Fig.26 A slow longitudinal displacement or a fast longitudinal displacement occurs in the direction indicated by the middle arrow X1, so that the movable clamping ring 31 synchronously drives the movable tube 33 to perform a slow or fast displacement outside the guide tube 60, so as to drive the basket assembly 70 to achieve a slow release or a fast release, thereby avoiding affecting the thrombolytic therapy effect.

[0164] like Fig.26 and Fig.28As shown, the two longitudinal ends of the main body 11 are radially outwardly protruded to form a limit boss 113 and a limit boss 114 for limiting the longitudinal displacement of the transmission assembly 30. The interventional catheter 2 also includes a limit tube 116 coaxially arranged in the main body 11, the limit tube 116 is axially embedded in the limit boss 114, and partially extends axially into the transmission tube 32, and the limit tube 116 is sleeved on the outside of the guide tube 60. The limit boss 113 and the limit boss 114 are used to limit the longitudinal displacement distance of the transmission assembly 30. The limit tube 116 can play a guiding and supporting role for the guide tube 60. When the transmission tube 32 is displaced in the longitudinal direction, it can be longitudinally displaced on the outside of the limit tube 116, so as to improve the stability of the longitudinal displacement of the transmission tube 32 through the limit tube 116.

[0165] like Fig.26 and Fig.37 As shown, the basket assembly 70 includes: an expansion portion 701 with a variable diameter, a first net end 702 formed on the expansion portion 701 and connected to the movable tube 33, a second net end 703 longitudinally opposite to the first net end 702, and a guide tip 704 sleeved on the outside of the guide tube 60 and connected to the second net end 703. The first net end 702 and the movable tube 33, as well as the second net end 703 and the guide tip 704 can be connected by injection molding, hot melting, bonding, etc. The expansion portion 701 is guided into the blood vessel by the guide tip 704 to facilitate passing through the thrombus. Fig.26 When longitudinal displacement occurs in the direction indicated by arrow X1, the first net end 702 will be driven to move synchronously, so that the diameter of the expansion part 701 becomes larger, and the thrombus is squeezed and cut during the expansion process, and a larger thrombus is broken into multiple smaller thrombi, so that the blood circulation in the blood vessel is restored to establish a blood flow path and open the blood vessel. The expansion part 701 is provided with a plurality of operation units 711 at intervals, and the operation units 711 can be configured as piezoelectric crystals, radio frequency electrodes, microwave generating elements, ultrasonic units, echolocation transducers, etc.

[0166] like Fig.37 and Fig.38 As shown, the front end of the basket assembly 70 is provided with a mesh cover unit 80 in the longitudinal direction. The mesh cover unit 80 forms a funnel shape after opening, and the diameter ranges from 3 to 30 mm. Preferably, when the mesh cover unit 80 is sleeved on the outside of the basket assembly 70, the basket assembly 70 can exert an outward expansion force on the mesh cover unit 80 during the expansion process, and the mesh cover unit 80 is released outward and forms a funnel shape as shown in FIG. Fig.37 and Fig.38 Optionally, the net cover unit 80 may also be arranged on the inner side of the net basket assembly 70; when the net basket assembly 70 expands, the net cover unit 80 loses the force applied inward by the net basket assembly 70 to the net cover unit 80 and forms a Fig.38The mesh unit 80 is woven from strips of nickel-titanium alloy, with 5-20 weaves per inch. The mesh unit 80 can block broken thrombi or decomposition products of thrombi, etc., to prevent the broken thrombi or decomposition products of thrombi from being free to other areas of the blood vessel to form secondary thrombi.

[0167] Combination Figures 1 to 39 As shown, this embodiment also discloses a method of using the above-mentioned interventional catheter, comprising the following steps:

[0168] Step S1, the guide tube 60 enters the patient's blood vessel and delivers the basket assembly 70 to the lesion;

[0169] For example, in the treatment of pulmonary embolism, the basket assembly 70 is inserted into the lesion (i.e., the embolic site where thrombus is formed in the blood vessel) through the guide tube 60;

[0170] Step S2: in the guiding state, the interventional catheter switching device 1 drives the transmission assembly 30 to move longitudinally, or in the separated state, the interventional catheter switching device 1 drives the transmission assembly 30 to move longitudinally; for example, in the treatment process for pulmonary embolism, it is necessary to drive the transmission assembly 30 in the guiding state by the interventional catheter switching device 1. Fig.26 Slow displacement in the direction indicated by arrow X1; for example, when the embolic area is large or during the treatment of deep vein thrombosis in the lower limbs, it is necessary to quickly establish a blood flow path to clear the embolic blood vessel, it is necessary to drive the transmission component 30 along the direction indicated by arrow X1 in the separated state through the interventional catheter switching device 1 Fig.26 Rapid displacement in the direction indicated by arrow X1;

[0171] Step S3: The transmission assembly 30 drives the basket assembly 70 to expand or contract.

[0172] The transmission component 30 is displaced slowly in the longitudinal direction to slowly release the basket component 70, so that the basket component 70 is slowly expanded, thereby slowly stretching the blood vessel for thrombolytic therapy, and preventing the basket component 70 from being released too quickly and expanding too much, causing the basket component 70 to over-stretch the blood vessel, which is easy to damage the blood vessel wall and stimulate the heart; the transmission component 30 is displaced quickly in the longitudinal direction to quickly release the basket component 70, so that the basket component 70 is quickly expanded, and the thrombus is squeezed and cut during the expansion process, and a larger volume of thrombus is broken into multiple smaller thrombi, so that the blood circulation in the blood vessel is restored, so as to quickly establish a blood flow path to clear the embolic blood vessel, and can increase the contact area between the released basket component 70 and the thrombus to form an all-round contact, increase the thrombus exposure area, improve the efficiency of the basket component 70 in dissolving the thrombus, and avoid affecting the thrombolytic therapy effect; the transmission component 30 is displaced slowly in the longitudinal direction to slowly release the basket component 70, so that the basket component 70 is slowly expanded, and the thrombus is extruded and cut during the expansion process, and a larger volume of thrombus is broken into multiple smaller thrombi, so that the blood circulation in the blood vessel is restored, so as to quickly establish a blood flow path to clear the embolic blood vessel, and can increase the contact area between the released basket component 70 and the thrombus to form an all-round contact, increase the thrombus exposure area, and improve the efficiency of the basket component 70 in dissolving the thrombus, so as to avoid affecting the thrombolytic therapy effect; Fig.26 The basket assembly 70 is quickly displaced or slowly displaced in the direction indicated by the arrow X2 to drive the basket assembly 70 to contract, thereby facilitating the movement of the basket assembly 70 in the blood vessel.

[0173] Before executing step S1, the interventional catheter 2 may be fixed to the patient's limb. Fig.26 As shown, the interventional catheter 2 further includes: a base 50 supporting the interventional catheter switching device 1, the base 50 includes at least one wing plate 51 that fits the human limb, and the wing plate 51 forms a through hole 52. By fitting the wing plate 51 to the human limb, optionally, an elastic rope (not shown) is used to pass through the through hole 52, so that the base 50 is tied and fixed to the patient's limb, so as to fix the interventional catheter 2.

[0174] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

[0175] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0176] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An interventional catheter switching device, characterized in that: include: A main body, an inner tube sleeved outside the main body and displaced in the longitudinal direction, wherein at least a part of the side wall of the main body forms a guide portion for guiding the inner tube to displace in the longitudinal direction when rotating relative to the main body; At least one switching member rotatably connected to the inner tube is embedded in the inner tube circumferentially, and the switching member forms a pivot axis which forms a set angle with the longitudinal extension direction of the main tube; The switching member is constructed with a guiding end guided by the guiding portion. When any end of the switching member along the longitudinal direction is subjected to force, the switching member rotates around the pivot axis to release the guiding state formed by the guiding end and the guiding portion.

2. The interventional catheter switching device according to claim 1, characterized in that: When the switching member is away from the guiding end and a force is applied to the end portion along the longitudinal direction, the switching member rotates around the pivot axis to release the guiding state formed by the guiding end and the guiding portion.

3. The interventional catheter switching device according to claim 2, characterized in that: When the switching member is away from the guiding end and the end portion along the longitudinal direction is subjected to force, the guiding state formed by the guiding end and the guiding portion is released, and the switching member returns to the guiding state when the force on the end portion is removed.

4. The interventional catheter switching device according to claim 2, characterized in that: When the switching member is away from the guiding end and a force is applied to the end portion along the longitudinal direction, the switching member rotates around the pivot axis and keeps the guiding end and the guiding portion in a separated state.

5. The interventional catheter switching device according to claim 1, characterized in that: The guide portion is configured as a spiral groove which is arranged in a spiral shape along the longitudinal direction around the side wall of the main pipe body, and the inner pipe is synchronously displaced along the longitudinal direction when rotating relative to the main pipe body.

6. The interventional catheter switching device according to claim 1, characterized in that: The guide portion is configured as a guide groove arranged in a spiral shape along the longitudinal direction around the side wall of the main body, the inner tube is displaced in the longitudinal direction when it rotates relative to the main body, and the guide groove forms at least one locking state that limits the longitudinal displacement of the inner tube relative to the main body when the inner tube rotates relative to the main body.

7. The interventional catheter switching device according to claim 6, characterized in that: The guide groove comprises: a plurality of rotating grooves and movable grooves which are alternately distributed in the circumferential direction and the longitudinal direction; The rotation groove guides the inner tube to rotate relative to the main tube body and restricts the inner tube from being displaced longitudinally relative to the main tube body, and the movable groove guides the inner tube to be displaced longitudinally relative to the main tube body.

8. The interventional catheter switching device according to claim 6, characterized in that: The guide grooves include: a plurality of rotating grooves and movable grooves alternately distributed in the circumferential direction and the longitudinal direction, and a plurality of spiral guide grooves connected to the rotating grooves and / or the movable grooves and extending in a spiral shape; The rotation groove guides the inner tube to rotate relative to the main tube body and limits the inner tube from longitudinally displacing relative to the main tube body, the movable groove guides the inner tube to longitudinally displace relative to the main tube body, and the rotation guide groove guides the inner tube to synchronously displace longitudinally when rotating relative to the main tube body.

9. The interventional catheter switching device according to any one of claims 5 to 8, characterized in that: The guide portion at least partially extends into the side wall of the main tube.

10. The interventional catheter switching device according to claim 1, characterized in that: The pivot shaft is composed of an abutment end of a switching member protruding along a set pivot direction formed by the pivot shaft, and the inner tube forms a first pivoting portion that accommodates the abutment end for the switching member to rotate along the pivot direction.

11. The interventional catheter switching device according to claim 1, characterized in that: The pivot shaft is composed of an inner tube protruding along a set pivot direction formed by the pivot shaft and at least partially extending into the support end of the switching member, and the switching member forms a second pivot part that accommodates the support end for the switching member to rotate along the pivot direction.

12. The interventional catheter switching device according to claim 1, characterized in that: The pivot shaft is composed of a pivot assembly in which a switching member and an inner tube are mutually embedded along a set pivot direction formed by the pivot shaft and the switching member is allowed to rotate along the pivot direction.

13. The interventional catheter switching device according to claim 12, characterized in that: The pivot assembly includes: a first protruding end and a second protruding end formed by the switching member and the inner tube respectively protruding in the same direction along the pivot direction, and a third pivot part and a fourth pivot part respectively formed by the inner tube and the switching member to accommodate the first protruding end and the second protruding end, so that the switching member can rotate along the pivot direction.

14. The interventional catheter switching device according to any one of claims 10 to 13, characterized in that: The axis direction of the pivot shaft forms a set angle α with the longitudinal extension direction of the main pipe, and the angle α is greater than 0° and less than 180°.

15. The interventional catheter switching device according to any one of claims 10 to 13, characterized in that: The interventional catheter switching device further comprises: an outer tube coaxially sleeved on the outer side of the inner tube and surrounding the switching member, the inner tube radially protruding outward to form an outer plate, and a first elastic member clamped between the outer plate and the outer tube; The side wall of the outer tube is radially protruded inward to form a protrusion that abuts against the guide end, and the first elastic member forms an elastic biasing force on the outer tube in the longitudinal direction to maintain the guiding state between the guide end and the guide portion.

16. The interventional catheter switching device according to any one of claims 10 to 13, characterized in that: The interventional catheter switching device further comprises: an outer tube coaxially sleeved on the outer side of the inner tube and surrounding the switching member, a movable rod penetrating the side wall of the outer tube, a transmission rod rotatably connected with a switching end formed by an end of the switching member away from the guide end, one end of the movable rod extending into the side wall of the outer tube being rotatably connected with an end of the transmission rod away from the switching end, one end of the movable rod extending out of the side wall of the outer tube being radially protruding outward to form a top cover, and a second elastic member clamped between the side wall of the outer tube and the top cover; The second elastic member forms an elastic force on the top cover along the penetrating direction of the movable rod penetrating the side wall of the outer tube, so as to maintain the guiding state formed between the guiding end and the guiding part.

17. The interventional catheter switching device according to any one of claims 10 to 13, characterized in that: The pivot shaft and the inner tube are configured with a pair of torsion members for applying torsion to the guide end, so as to maintain the guiding state formed between the guide end and the guide portion.

18. The interventional catheter switching device according to claim 15, characterized in that: The outer tube is configured with a groove, the groove at least partially accommodating the switching end formed by the end of the switching member away from the guide end and in the longitudinal direction, and the groove forms a guide annular surface connecting the protrusion ； The outer tube is displaced in the longitudinal direction to drive the guide annular surface to drive the switching end, and the switching member rotates around the pivot axis to release the guiding state formed between the guide end and the guiding part before the guide annular surface contacts the switching end.

19. An interventional catheter, characterized in that: include: The interventional catheter switching device according to any one of claims 1 to 18, a guide tube axially penetrating the interventional catheter switching device, a basket assembly formed at the end of the guide tube, and a transmission assembly configured on the interventional catheter switching device ； The interventional catheter switching device drives the transmission assembly to move longitudinally to drive the basket assembly to expand or contract.

20. The interventional catheter according to claim 19, characterized in that The interventional catheter further comprises: a base supporting the interventional catheter switching device, wherein the base comprises at least one wing plate that fits a human limb, and the wing plate forms a through hole.

21. The interventional catheter according to claim 19, characterized in that The transmission assembly comprises: an active clamping ring sleeved on the outside of the main body and driven by the interventional catheter switching device, a transmission tube axially arranged inside the main body and connected to the active clamping ring, and an active tube longitudinally embedded at the front end of the transmission tube and extending out of the main body; The movable tube is sleeved on the outside of the guide tube and connected to the basket assembly. The movable clamping ring is displaced longitudinally relative to the main tube body to drive the movable tube to drive the basket assembly to expand or contract.

22. The interventional catheter according to claim 21, characterized in that The transmission assembly further comprises: a connection element for driving the movable snap ring to move longitudinally relative to the main pipe body; The transmission pipe is radially protruded outward to form a plurality of first transmission blocks that penetrate the side wall of the main pipe body and at least partially extend into the movable clamping ring; A plurality of guide grooves are formed on the side wall of the main tube and are distributed longitudinally for guiding the longitudinal displacement of the first transmission block.

23. The interventional catheter according to claim 22, characterized in that The engagement element is configured as an outer shell circumferentially arranged around the inner tube and circumferentially separated from the main tube; The movable snap ring is recessed radially inward to form a receiving groove, and the outer shell is configured with a rotating end that at least partially radially extends into the receiving groove, so that the outer shell can rotate axially relative to the main body; The outer shell forms an extended wall that longitudinally abuts against both ends of the inner tube. The outer tube is constructed with a pusher that penetrates the side wall of the outer shell and is formed outside the outer shell. The side wall of the outer shell is provided with an open groove for guiding the longitudinal displacement of the pusher.

24. The interventional catheter according to claim 22, characterized in that The connection element is configured as a connection shell which is axially sleeved on the outside of the main pipe and connected to the inner pipe; The movable snap ring is recessed radially inward to form a receiving groove, and the connecting shell is constructed with a connecting end that at least partially radially extends into the receiving groove, so that the connecting shell can rotate axially relative to the main pipe body.

25. The rotary interventional catheter according to claim 22, characterized in that: The engagement element is configured as an engagement protrusion formed by the end of the inner tube close to the movable snap ring protruding radially outward, and the engagement protrusion at least partially extends into the movable snap ring; The movable clamping ring forms a second annular cavity circumferentially arranged outside the connecting protrusion, so that the inner tube can rotate axially relative to the movable clamping ring.

26. The interventional catheter according to claim 21, characterized in that The transmission pipe is radially outwardly provided with a plurality of second transmission blocks penetrating the side wall of the main body and at least partially extending into the movable snap ring, and the movable snap ring forms a first annular cavity circumferentially arranged outside the second transmission block, so that the movable snap ring can rotate axially relative to the second transmission block; The side wall of the main body is formed with a plurality of guide grooves distributed longitudinally for guiding the longitudinal displacement of the second transmission block; The inner tube is fixedly connected to the movable snap ring. When the inner tube rotates relative to the main tube body, the movable snap ring is synchronously driven to rotate and displace in the longitudinal direction, so as to synchronously drive the second transmission block so that the transmission tube drives the movable tube to displace in the longitudinal direction, thereby driving the basket assembly to expand or contract.

27. The interventional catheter according to any one of claims 21 to 26, characterized in that The longitudinal ends of the main pipe body are radially protruded outward to form a limit boss and a limit boss seat for limiting the longitudinal displacement of the transmission component. The interventional catheter also includes a limit tube coaxially arranged in the main pipe body, the limit tube is axially embedded in the limit boss seat, and partially movably extends axially into the transmission pipe.

28. The interventional catheter according to claim 27, characterized in that The front end of the basket assembly is provided with a mesh cover unit in the longitudinal direction, and the mesh cover unit forms a funnel shape after being opened, and the diameter ranges from 3 to 30 mm.

29. A method for using an interventional catheter according to any one of claims 19 to 28, characterized in that: The steps include: Step S1, the guide tube enters the patient's blood vessel and delivers the basket assembly to the lesion; Step S2, driving the transmission component to move longitudinally by the interventional catheter switching device in the guiding state, or driving the transmission component to move longitudinally by the interventional catheter switching device in the separated state; Step S3: The transmission assembly drives the basket assembly to expand or contract.

30. The method of use according to claim 29, characterized in that: Before step S1, the method further includes: fixing the interventional catheter to the patient's limb.

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