Fixing device of intrusive catheter pump and intrusive catheter pump system

Abstract

The utility model discloses a fixing device of an interventional catheter pump, the interventional catheter pump comprises a catheter, a driving assembly connected to the near end of the catheter and a pump head connected to the far end of the catheter, and the driving assembly is used for driving the pump head to operate so as to pump blood; the fixing device comprises a base for bearing the driving assembly; the mounting parts are arranged on two opposite sides of the base; the base and the mounting part form an accommodating space of the driving assembly; the clamping mechanism is arranged on at least one of the two mounting parts and is used for operably fixing the driving assembly on the base; the clamping mechanism comprises a clamping end located on the side, facing the containing space, of the installation part and an execution component located on the side, away from the containing space, of the installation part. The clamping end is configured to move towards or away from the driving assembly when the execution component is operated so as to clamp or release the driving assembly.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of fixing device and interventional catheter pump system of interventional catheter pump, belong to medical instrument technical field. BACKGROUND

[0002] Catheter pump is driven by motor to rotate impeller of pump head to realize the auxiliary of patient ventricle, long time continuous support is desirable. Therefore, in the working process of catheter pump, how to be stably maintained motor is a problem worth paying attention to.

[0003] As the scheme provided in CN110545856A, it is by two patches surrounding motor, then adhering on the thigh of patient. This way of wrapping and pasting, fixed strength is not high, generally can only be applied to small volume, light weight motor. Therefore, limit is greater.

[0004] And the scheme provided in US9675738B2, an opening is arranged on motor housing, a flexible piece is arranged in the opening. A connecting part is arranged on installation platform, and the connecting part has a groove. When installing, hand-held motor is aimed at connecting part. Flexible piece is deformed by extrusion, and finally enters the groove. With the friction effect of flexible piece and groove, the fixation of motor is realized. Platform can be fixed on the arm or leg of patient, or can be fixed on another platform. This way, flexible piece is squeezed and deformed to generate greater friction force to hold connecting part. But the fixed strength is also not high, generally can only be applied to small volume, light weight motor. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of fixing device and interventional catheter pump system for interventional catheter pump, the fixing device can realize the stable fixation of the drive assembly of different volume and weight interventional catheter pump.

[0006] To achieve the above object, the utility model provides the following technical scheme: a kind of fixing device of interventional catheter pump, the interventional catheter pump includes: catheter, drive assembly connected to the proximal end of the catheter, pump head connected to the distal end of the catheter, the drive assembly is used to drive the pump head action to carry out blood pumping;The fixing device includes:

[0007] The base of bearing the drive assembly;

[0008] Installation part is arranged in the two opposite sides of the base;

[0009] The base and the installation part constitute the containing space of the drive assembly;

[0010] A clamping mechanism is arranged on at least one of the mounting portions for operatively fixing the driving assembly between the mounting portions; wherein

[0011] The clamping mechanism comprises a clamping end head arranged on the side of the mounting portion facing the accommodating space and an execution component arranged on the side of the mounting portion away from the accommodating space; the clamping end head is configured to move towards or away from the driving assembly when the execution component is operated to clamp or release the driving assembly.

[0012] Optionally, the fixing device further comprises a strap arranged on the base for operatively fixing the fixing device on the patient.

[0013] Optionally, at least one side wall of the driving assembly is inwardly recessed to form an axial waistline groove, and the clamping end head can abut and match the waistline groove.

[0014] Optionally, the execution component comprises a force applying member and a transmission assembly connecting the force applying member and the clamping end head, and the transmission assembly is adapted to convert the rotary motion of the force applying member into the linear motion of the clamping end head.

[0015] Optionally, the transmission assembly further comprises an information feedback assembly, which is at least partially located between the force applying member and the clamping end head, and the information feedback assembly sends feedback information after the clamping end head abuts against the driving assembly.

[0016] Optionally, the information feedback assembly further comprises a driving member and an actuating member arranged between the driving member and the force applying member; the transmission assembly further comprises a connecting screw connecting the driving member and the clamping end head; the driving member and the actuating member have a first matching state and a second matching state; wherein, when the driving member and the actuating member are in the first matching state, the force applying member drives the clamping end head to move inwardly or outwardly; when the driving member and the actuating member are in the second matching state, the force applying member drives the actuating member to move relative to the driving member.

[0017] Optionally, the end portion of the driving member towards the actuating member is provided with a docking portion, and the actuating member has an actuating portion matched with the docking portion; when the relative force between the docking portion and the actuating portion exceeds a certain relative force in the second matching state, the docking portion and the actuating portion can relatively disengage and the actuating portion can slide relative to the docking portion.

[0018] Optionally, the execution component further comprises a resilient member arranged between the actuating portion and the force applying member, and the resilient member is configured to always apply an elastic force to the actuating portion to press the driving member.

[0019] Optionally, one of the force applying member and the actuating member is provided with a notch, and the other is provided with a protrusion, the length of the notch in the axial direction of the force applying member is greater than the length of the protrusion, and the width of the notch in the circumferential direction of the force applying member is adapted to the width of the protrusion.

[0020] Optionally, the force applying member is provided with a clamping structure, the clamping structure has a first part extending in the radial direction and a second part extending from the first part towards the clamping head along the central axis, and the actuating member and the elastic member are sleeved on the second part and can slide on the second part in the axial direction.

[0021] Optionally, the clamping structure further comprises a third part extending from the second part towards the central axis along the direction away from the clamping head, and the end of the connecting screw away from the clamping head extends into the cavity of the force applying member, and a nut is locked on the connecting screw, the nut is located on the outside of the driving member, and a stop washer is arranged between the driving member and the connecting screw, the stop washer and the driving member are sequentially fixed on the connecting screw in the axial direction of the connecting screw, and the stop washer and the driving member form a gap in the axial direction, the third part extends into the gap and can move in the axial direction in the gap.

[0022] Optionally, the transmission assembly comprises a driving member, and the transmission assembly further comprises a connecting screw connecting the driving member and the clamping end, and the driving member and the force applying member have a first matching state and a second matching state, wherein, in the first matching state, the driving member and the force applying member drive the clamping head to move towards the inside or the outside, and in the second matching state, the driving member and the force applying member move relative to each other.

[0023] Optionally, the end of the driving member towards the actuating member is provided with a docking part, the force applying member is provided with an actuating part matched with the docking part, and in the second matching state, when the relative force between the docking part and the actuating part exceeds a certain relative force, the docking part and the actuating part can relatively disengage, and the actuating part can slide relative to the docking part.

[0024] Optionally, the matching between the actuating part and the docking part is tooth engagement.

[0025] Optionally, the docking part and the actuating part are straight tooth engagement in a first rotation direction and are helical tooth engagement in a second rotation direction, wherein the first rotation direction is the rotation direction when the force applying member drives the clamping head to move towards the outside of the mounting part, and the second rotation direction is the rotation direction when the force applying member drives the clamping head to move towards the inside of the mounting part.

[0026] Optionally, the mating part and the actuating part include a helical tooth surface for realizing helical tooth meshing, the helical tooth surface having a plane forming a tooth tip surface and an inclined surface extending from the tooth groove toward the tooth tip surface.

[0027] Optionally, the connecting screw passes through the mounting portion, a reinforcing member is provided between the mounting portion and the connecting screw, the reinforcing member is fixed inside the mounting portion, and the connecting screw and the reinforcing member are connected by a thread.

[0028] Optionally, the fixing device further includes a guide component, and the clamping end is driven to move inward or outward along the guide component.

[0029] This application also provides an interventional catheter pump system, comprising: a drive assembly including a motor housing and a motor housed within the motor housing; a working assembly including a catheter, a drive shaft passing through the catheter, and a pump head connected to the distal end of the catheter, the proximal end of the drive shaft being tractably connected to the motor to receive the rotational force of the motor; the pump head including a pump housing having an inlet and an outlet, and an impeller housed within the pump housing, the impeller being connected to the distal end of the drive shaft; when the impeller rotates, it can draw blood from the inlet into the pump housing and then pump it out of the pump housing from the outlet; and a fixing device adapted to fix the working assembly, the fixing device being any of the fixing devices described above.

[0030] The beneficial effects of this application are as follows: by providing a base and mounting portions on two opposite sides of the base, and a clamping mechanism on at least one of the two mounting portions in the fixing device of the interventional catheter pump drive assembly, the drive assembly can be limited between the base and the mounting portions; wherein, the operating execution component drives the clamping end to move inward or outward, so that the clamping end and the drive assembly move relative to each other or towards each other, thereby clamping or releasing the drive assembly, which can meet the fixing and clamping requirements of drive assemblies of different sizes and weights. Compared with the prior art, by directly abutting the drive assembly with the clamping end, the rigid positioning of the drive assembly can be achieved, thereby ensuring that large and heavy drive assemblies can be stably fixed. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of the conduit pump according to an embodiment of the present utility model;

[0032] Figure 2 This is a schematic diagram of the fixing device of this application;

[0033] Figure 3 for Figure 2 An exploded view of the fixing device shown;

[0034] Figure 4 for Figure 2 A cross-sectional view of the fixing device shown;

[0035] Figure 5 For Figure 2 The structure diagram of the execution component of the fixing device is shown in the figure;

[0036] Figure 6 For Figure 5 The partial structure exploded view is shown in the figure;

[0037] Figure 7 For Figure 5 The schematic diagram of the actuating part and the docking part of the execution component is shown in the figure;

[0038] Figure 8 For Figure 5 The schematic diagram of the actuating part and the docking part of the execution component is shown in the figure. DETAILED DESCRIPTION

[0039] The interventional catheter pump system of the embodiment of the utility model can at least partially assist the blood pumping function of the heart, and realize the function of at least partially reducing the burden of the heart. In an illustrative scenario, the interventional catheter pump system can be used as a left ventricular assist device, and the working part (specifically, the pump head below) can be intervened into the left ventricle, and the blood in the left ventricle can be pumped into the ascending aorta when the pump head operates.

[0040] The above-mentioned example is used as a left ventricular assist device, which is only one feasible application scenario of the interventional catheter pump system. In other feasible and not explicitly excluded scenarios, the interventional catheter pump system can also be used as a right ventricular assist device, and the pump head can be intervened into the right ventricle, and the blood in the vein can be pumped into the right ventricle when the pump head operates. The following mainly describes the scenario in which the interventional catheter pump system is used as a left ventricular assist device. However, based on the above description, the protection scope of the embodiment of the utility model is not limited.

[0041] As Figure 1As shown, the interventional catheter pump system 1000 comprises a driving assembly 100, a working assembly 200 and a fixing device (not shown) adapted to fix the working assembly 200. The driving assembly 100 comprises a motor housing 101, a motor (not shown) received in the motor housing 101 and a driving member (not shown) driven by the motor. The working assembly 200 can adopt an existing structure, generally, the working assembly 200 comprises a catheter 201, a driving shaft (not shown) passing through the catheter 201, a driven member (not shown) connected to a proximal end of the driving shaft 202 and a driving catheter handle 204 and a pump head 205 connected to a proximal end and a distal end of the catheter 201 respectively. The proximal end of the driving shaft is drivingly connected to the motor to receive the rotational force of the motor. The pump head 205 comprises a pump housing 2051 having an inlet 2051a and an outlet 2051b, and an impeller (not shown) received in the pump housing 2051. A protection head 210 is arranged on the distal end of the pump head 205. The impeller is connected to the distal end of the driving shaft. When the impeller rotates, blood can be sucked into the pump housing 2051 from the inlet 2051a and pumped out of the pump housing 2051 from the outlet 2051b.

[0042] The driving catheter handle 204 and the driving assembly 100 are detachably connected, and the connection can adopt a locking nut or a buckle connection provided in US9421311B2. The driven member and the driving member are non-contact coupled to transmit the rotational power of the motor to the driving shaft, thereby driving the impeller to rotate and pump blood.

[0043] Please refer to Figure 2 The fixing device 300 comprises a base 1, mounting portions 2 arranged on opposite sides (left and right sides) of the base 1 and a clamping mechanism 3 arranged on at least one of the mounting portions 2. The base and the mounting portions form a containing space for clamping the driving assembly, wherein the base 1 is provided with a positioning groove 11 adapted to place the driving assembly 100 to prevent the driving assembly 100 from being deviated in position, and an end of the positioning groove 11 in the longitudinal direction, for example, the proximal end, is arranged as an inclined surface to guide and position the driving assembly 100. The clamping mechanism 3 is used to operatively fix the driving assembly 100 on the base 1. In this embodiment, the base 1 and the mounting portions 2 are integrally injection molded to form an injection molded piece. Of course, in other embodiments, the base and the mounting portions can also be separately formed. The clamping mechanism 3 comprises a clamping end 31 located on the inner side of the mounting portion 2 and an execution component 32 located on the outer side of the mounting portion 2, wherein the inner side is a space for containing the driving assembly. By operating the execution component 32 to drive the clamping end 31 to move towards the inner side or the outer side of the mounting portion 2, the driving assembly 100 of different volumes and weights can be clamped or released. The clamping end 31 directly abuts against the driving assembly 100 to achieve rigid positioning of the driving assembly 100, thereby ensuring that the motor 101 with large volume and weight can be more stably fixed.

[0044] The at least one side wall of the driving assembly 100 is inwardly recessed to form an axial waistline groove, which has no particular limitation on axial length as long as it can match the clamping head 31. The waistline groove of the driving assembly 100 matches the clamping head 31, so that the driving assembly 100 can be fastened and stopped in the axial and radial directions, thereby achieving more reliable fixing effect.

[0045] It should be noted that in the embodiment, the clamping mechanism 3 is arranged on only one mounting portion 2, and the staff approaches or moves away from the other mounting portion 2 by operating the clamping mechanism 3. In other embodiments, the clamping mechanism 3 can be arranged on the other mounting portion 2, or the clamping mechanism 3 is arranged on both mounting portions 2.

[0046] Please refer to Figure 3 and Figure 4 , the execution component 32 includes a force applying member 321 and a transmission assembly 326 connecting the force applying member 321 and the clamping head 31. The transmission assembly 326 is adapted to convert the rotary motion of the force applying member 321 into the linear motion of the clamping head 31, so as to drive the clamping head 31 to move inwardly or outwardly, thereby achieving clamping or releasing the driving assembly 100 (see Figure 1 ). In the embodiment, the force applying member 321 is a knob, a button or a hand wheel. By setting the force applying member 321 as a knob, a button or a hand wheel, the rotary motion is converted into the linear motion of the clamping head 31 by the transmission assembly 326, so as to facilitate operation and facilitate precision control.

[0047] In combination with Figure 3 and Figure 4 , the transmission assembly 326 includes a connecting screw 3263 connecting the clamping head 31 and the force applying member 321.

[0048] One end of the connecting screw 3263 is fixedly connected with the clamping head 31. The fixed connection between the connecting screw 3263 and the clamping head 31 can adopt the prior art, for example, the clamping head 31 is formed with a mounting through hole 311, the connecting screw 3263 has a mounting end 3263a, the mounting end 3263a is inserted into the mounting through hole 311, the connecting screw 3263 is radially protruded to form a pressing convex ring 3263b, and the pressing convex ring 3263b is located outside the mounting end 3263a (the outside is that the connecting screw 3263 is taken as a reference with the clamping head 31, and the connecting screw 3263 is located on the side of the clamping head 31). Figure 4The installation end 3263a is inserted into one end of the installation through hole 311, protrudes out of the installation through hole 311 and extends into the cavity 312 of the clamping head 31, the snap ring 313 is arranged in the cavity 312, and the diameter of the installation through hole 311 is smaller than the diameter of the snap ring 313 and the abutting convex ring 3263b. The snap ring 313 is clamped at the end of the installation end 3263a extending into the cavity (the clamping manner can be that a clamping groove matched with the snap ring 313 is formed on the end), and is abutted on both sides of the side wall of the installation through hole 311 opposite to the abutting convex ring 3263b, so as to fix the installation end 3263a on the clamping head 31. In the embodiment, in order to facilitate the assembly between the connecting screw 3263 and the clamping head 31, the clamping head 31 comprises a first shell 314 and a second shell 315 clamped with the first shell 314, the first shell 314 and the second shell 315 surround to form the cavity 312, and the installation through hole 311 is formed on the first shell 314. The assembly manner of the connecting screw 3263 and the clamping head 31 is that the installation end 3263a of the connecting screw 3263 is inserted into the installation through hole 311 until the abutting convex block 3263b abuts against the first shell 314, then the snap ring 313 is clamped in the clamping groove, so as to fix the connecting screw 3263 on the first shell 314, and then the second shell 315 is clamped on the first shell 314.

[0049] The connecting screw 3263 penetrates through the installation part 2, and the connecting screw 3263 is threadedly connected with the installation part 2. In the embodiment, a reinforcing part 322 is further arranged between the installation part 2 and the connecting screw 3263. The reinforcing part 322 is fixed in the installation part 2, and the connecting screw 3263 is threadedly connected with the reinforcing part 322. Specifically, the assembly through hole 30 is formed through the installation part 2, the reinforcing part 322 is installed in the assembly through hole 30, and the two can be in interference fit. The reinforcing part 322 is in a T-shaped column structure, the reinforcing part 322 is formed with an internal thread hole 3221, the connecting screw 3263 is formed with a threaded section 3263c threadedly matched with the internal thread hole 3221, the threaded section 3263c is located on the outer side of the abutting convex ring 3263b, and the length of the threaded section 3263c accounts for about 1 / 3 of the overall length of the connecting screw 3263. The length of the threaded section 3263c is longer than the length of the reinforcing part 322. The threaded connection between the connecting screw 3263 and the installation part 2 is realized by the reinforcing part 322 and the connecting screw 3263. The installation part 2 is fixed with the connecting screw 3263 by the reinforcing part 322, which has the following advantages: since the base 1 and the installation part 2 are integrally injection molded (an injection molded part) in the embodiment, when “slip teeth” occurs between the connecting screw 3263 and the reinforcing part 322, only the connecting screw 3263 and / or the reinforcing part 322 need to be replaced, and the injection molded part can still be used, so that the maintenance cost is saved.

[0050] Since the reinforcing member 322 is screwed with the connecting screw 3263, and the connecting screw 3263 is interference fitted with the mounting portion 2, i.e. the connecting screw 3263 is limited by the mounting portion 2 from rotating and moving, when the force applying member 321 rotates the connecting screw 3263, the connecting screw 3263 will move the clamping end 31 inwardly or outwardly.

[0051] In other embodiments, the reinforcing member 322 can be omitted, in which case an internal thread is formed in the assembly hole 30 of the mounting portion 2 to cooperate with the threaded section 3263c.

[0052] As mentioned above, the force applying member 321 is a knob, a button or a hand wheel, and its main purpose is to apply a rotating driving force to the connecting screw 3263. The force applying member 321 can be directly connected with the connecting screw 3263 to directly apply the driving force to the connecting screw 3263, but this way has the following problems: when the clamping end 31 moves inwardly to clamp the driving assembly 100 (see Figure 1 ), the operator determines whether the clamping is in place only by the reverse pressure applied by the clamping end 31 on the driving assembly 100. Since the inward movement of the clamping end 31 is stopped completely by the operator's perception of the reverse pressure, it is easy to cause overpressure during operation, which can damage the driving assembly 100.

[0053] In order to avoid damage to the driving assembly 100 due to overpressure operation, in the present embodiment, the transmission assembly 326 further comprises an information feedback assembly, which is at least partially located between the force applying member 321 and the clamping end 31. The information feedback assembly sends feedback information after the clamping end 31 abuts against the driving assembly 100, which reminds the operator that the clamping end 31 is clamped in place. The feedback information can be one or a combination of sound, prompt graphics, and prompt color. For example, a sensor (such as a pressure sensor) is provided to give feedback information by cooperation of the sensor and the controller, but the use of sensors and controllers will inevitably increase the overall cost. In order to reduce the cost, the present embodiment uses a mechanical structure to give feedback information.

[0054] Please refer to Figures 3 to 6The information feedback assembly comprises a driving member 3261 and an actuating member 3262 arranged between the driving member 3261 and the force applying member 321. The driving member 3261 and the actuating member 3262 have a first matching state for transmitting the rotating force and a second matching state for slipping. When the driving member 3261 and the actuating member 3262 are in the first matching state, the force applying member 321 drives the clamping end 31 to move towards the inner side or the outer side. When the driving member 3261 and the actuating member 3262 are in the second matching state, the force applying member 321 drives the actuating member 3262 to move relatively to form the mechanical feedback information. Through the two matching states of the driving member 3261 and the actuating member 3262, the driving member 3261 and the actuating member 3262 can not only transmit the force to adjust the position of the clamping end to drive the clamping driving assembly 100 or release the driving assembly 100, but also can emit the mechanical sound feedback information to remind the operator that the clamping end 31 has been clamped in place, thereby preventing the driving assembly 100 from being damaged due to the excessive movement of the clamping end 31.

[0055] In the embodiment, the driving member 3261 and the actuating member 3262 can realize two different matching states and different functions in the two matching states, and in the two different matching states, the force applying member 321 outputs the rotating force in the same direction, thereby not needing to change the force applying state and being simple for the operator to operate.

[0056] The driving member 3261 is a substantially flat columnar body, and the driving member 3261 is fixed on the connecting screw 3263. Specifically, the connecting screw 3263 also has a matching segment 3263d arranged at both ends of the threaded segment 3263c with the mounting end 3263a. The matching hole 32611d is formed in the central axis of the driving member 3261, and the matching segment 3263d is inserted into the matching hole 32611d and is in interference fit with the matching hole 32611d.

[0057] The actuating member 3262 cooperates with the driving member 3261 and the force applying member 321 to transmit the driving force on the force applying member 321 to the driving member 3261. Specifically, the actuating member 3262 is a substantially flat cylindrical body or a circular cake or a circular sheet with a small thickness, and comprises an actuating portion 32622 arranged at the end and a connecting portion 32621 arranged at the side of the actuating member 3262. The end of the driving member 3261 towards the actuating member 3262 is provided with a docking portion 32611. The actuating portion 32622 is adapted to cooperate with the docking portion 32611, and the connecting portion 32621 is adapted to cooperate with the force applying member 321. The inner side wall of the force applying member 321 is formed with a matching portion for cooperating with the connecting portion 32621.

[0058] When the driving member 3261 and the actuating member 3263 are in the first matching state, the abutting portion 32611 is engaged with the actuating portion 32622. In detail, when the force is applied to the force applying member 321, the matching portion of the force applying member 321 is matched with the connecting portion 32621 to transmit the force to the actuating member 3262, and the actuating portion 32622 is matched with the abutting portion 32611 of the driving member 3261, so as to drive the driving member 3261 to rotate, and further drive the connecting screw rod 3263 to rotate and drive the clamping end 31 to move inward or outward.

[0059] In the embodiment, the connecting portion 32621 and the matching portion are interfered in the circumferential direction of the force applying member 321, and the connecting portion 32621 is movable relative to the matching portion in the axial direction of the force applying member 321. In the foregoing embodiment, the connecting portion 32621 is located at the side portion, and in other embodiments, the connecting portion can also be located at the other end portion of the actuating member, and correspondingly, the matching portion is arranged on the inner end surface of the force applying member 321.

[0060] In the embodiment, the matching between the abutting portion 32611 and the actuating portion 32622 is the tooth engagement, so that when the first matching state, the abutting portion 32611 and the actuating portion 32622 are engaged to transmit the force on the force applying member 321 to the actuating member 3262, and when the second matching state, the abutting portion 32611 and the actuating portion 32622 can be in the non-engagement state (slip), so that the force cannot be transmitted to the actuating member 3262. By being arranged in this way, the matching mode between the abutting portion 32611 and the actuating portion 32622 is simple.

[0061] In the embodiment, the abutting portion 32611 and the actuating portion 32622 are in the straight tooth engagement in the first rotation direction and in the oblique tooth engagement in the second rotation direction, the first rotation direction is the rotation direction of the force applying member 321 when driving the clamping end 31 to the outside of the mounting portion 2, which is usually counterclockwise direction, Figure 6 indicated by the arrow b1; the second rotation direction is the rotation direction of the force applying member 321 when driving the clamping end 31 to the inside of the mounting portion 2, which is usually clockwise direction, Figure 6 indicated by the arrow b2.

[0062] In detail, please refer to Figure 3 , Figure 4 and Figure 5 , the abutting portion 32611 comprises a plurality of first teeth 32611a, the actuating portion 32622 comprises a plurality of second teeth 32622a, a first tooth groove 32611b is formed between adjacent two first teeth 32611a, a second tooth groove 32622b is formed between adjacent two second teeth 32622a, the first tooth 32611a is engaged with the second tooth groove 32622b, and the second tooth 32622a is engaged with the first tooth groove 32611b.

[0063] Each first tooth 32611a comprises a first straight tooth surface 32613 forming a vertical surface of a first tooth groove 32611b and a first helical tooth surface 32612 connecting the first straight tooth surfaces 32613 of two adjacent first teeth 32611a. Each second tooth structure is similar to the structure of the first tooth 32611a, which also comprises a second helical tooth surface 32623 and a second straight tooth surface 32624. When the first tooth 32611a and the second tooth 32622a are engaged, the first straight tooth surface 32613 and the second straight tooth surface 32624 form a straight tooth engagement, and the first helical tooth surface 32612 and the second helical tooth surface 32623 form a helical tooth engagement. Since the first helical tooth surface 32612 and the second helical tooth surface 32623 form a helical tooth engagement, two different engagement states can be achieved, the structure is simple and easy to implement, and the original tooth engagement is not damaged for a long time, ensuring the stability of use and reducing the maintenance in the later period.

[0064] In this embodiment, the assembly direction between the first tooth 32611a and the second tooth 32622a is parallel to the central axis of the driving member 3261.

[0065] See Figure 7 and Figure 8 , and in combination with Figure 4 When the force applying member 321 is rotated clockwise, the driving actuating part 32622 is rotated towards the second rotation direction b2, the first tooth 32611a and the second tooth 32622a, the second helical tooth surface 32623 and the first helical tooth surface 32612 abut each other, so that the actuating member 3262 drives the driving member 3261 to rotate towards the second rotation direction b2, thereby driving the connecting screw 3263 to rotate along the second rotation direction b2, and then the connecting screw 3263 drives the clamping end 31 to move towards the inner side, thereby achieving clamping of the driving assembly 100.

[0066] When the clamping head 31 is clamped to the driving assembly 100, if the force applying member 321 is still rotated clockwise, at this time, the force applying member 321 still drives the actuating part 32622 to rotate towards the second rotation direction b2, but since the clamping head 31 can no longer move inwards at this time, the driving member 3261 will no longer rotate, which is equivalent to the driving member 3261 being locked, at this time, the second bevel gear surface 32623 exerts a resisting force on the first bevel gear surface 32612, which will act on the second bevel gear surface 32623 in the opposite direction, so as to move the second bevel gear surface 32623 outwards, so that the second bevel gear surface 32623 rotates along the second rotation direction b2 while moving away from the driving member 3261, the first tooth 32611a and the second tooth 32622a are separated and not engaged. Since the force applying member 321 is still rotated counterclockwise, if a force is applied to the force applying member 321 in addition to the rotating force along the second rotation direction b2, which is the force that moves the force applying member 321 inwards, the force will be transmitted to the actuating part 32622 through the force applying member 321, so as to move the actuating part 32622 towards the driving member 3261, so when the second bevel gear surface 32623 is misaligned with the first bevel gear surface 32612 and the second bevel gear surface 32623 is opposite to the first tooth groove 32611b, the force will drive the second bevel gear surface 32623 into the first tooth groove 32611b, so that the first tooth 32611a and the second tooth 32622a are engaged again (as shown in FIG. 6B). Figure 8 ).

[0067] On the contrary, when the force applying member 321 is rotated counterclockwise, the actuating part 32622 is driven to rotate towards the first rotation direction b1, the second straight gear surface 32624 is in contact with the first straight gear surface 32613, so that the driving member 3261 drives the driving member 3261 to rotate towards the first rotation direction b1, so as to drive the connecting screw 3263 to rotate along the first rotation direction b1, so that the connecting screw 3263 drives the clamping head 31 to move outwards, so as to disassemble the driving assembly 100.

[0068] The abutting portion 32611 and the actuating portion 32622 are engaged by the second bevel gear surface 32623 and the first bevel gear surface 32612. When the clamping head 31 has been clamped to the driving assembly 100, if the force continues to be applied to the force applying member 321, at this time, the second bevel gear surface 32623 and the first bevel gear surface 32612 are not sufficient to drive the connecting screw 3263 to further move the clamping head 31 inward to clamp the driving assembly 100, the second bevel gear surface 32623 will slide relative to the first bevel gear surface 32612, that is, the abutting portion 32611 and the actuating portion 32622 will slip, so as to prevent the clamping head 31 from driving the driving assembly 100 to be damaged by a larger force. Because the abutting portion 32611 and the actuating portion 32622 slip, at this time, the operator will feel when rotating the force applying member 321, that is, feedback information.

[0069] In addition, a relative sliding sound will be emitted between the two, so as to remind the user that the clamping head 31 has clamped the driving assembly 100. The sliding sound can be regarded as another feedback information.

[0070] It should be noted that in the embodiment, the first bevel gear surface 32612 is not completely inclined, part of which forms a flat surface, which is the addendum surface of the first tooth 32611a, and the other part is an inclined surface extending from the first tooth groove 32611b to the addendum surface, and the second bevel gear surface 32623 is formed with a corresponding structure. In this way, the relative distance between the first bevel gear surface 32612 and the second bevel gear surface 32623 when they are separated can be reduced, and the rigid impact when the first tooth and the second tooth 32622a re-engage after being separated can be reduced, so as to minimize the wear of the first tooth 32611a and the second tooth 32622a.

[0071] In addition, in actual application, the abutting portion 32611 and the actuating portion 32622 can also be engaged by bevel gears in the first rotation direction b1, but compared with straight tooth engagement, the stability of transmission of bevel gear engagement in the first rotation direction b1 is not as good as that of straight tooth engagement because of the possible slippage.

[0072] In other embodiments, other connection manners can also be adopted between the abutting portion 32611 and the actuating portion 32622, such as that one of the abutting portion 32611 and the actuating portion 32622 is a matching groove, and the other is a fitting groove, and an elastic member and a ball (or a column structure) are arranged in the fitting groove, at least part of the ball is accommodated in the matching groove, and the elastic member applies pressure to the ball towards the matching groove. When the clamping end head 31 needs to be driven to move inwards or outwards, the actuating member 3262 is connected with the driving member 3261 due to the elastic member abutting the ball to the matching groove, so that the driving force on the force applying member 321 can be transmitted to the actuating member 3262 by the driving member 3261, so as to move the clamping end head 31 inwards or outwards. When the clamping end head has clamped the driving assembly, if the force applying member 321 is still rotated clockwise, the cooperation of the ball and the matching groove is not enough to drive the clamping end head 31 to move inwards again, at this time, the ball is pushed out of the matching groove by the reverse force applied on the actuating member 3262, and the elastic member is compressed to store energy, and the driving member 3261 can rotate relative to the actuating member 3262, and when the ball is pushed to the next matching groove position with the driving member 3261, the ball is pushed into the matching groove again.

[0073] Of course, the connection manner of the abutting portion 32611 and the actuating portion 32622 is not limited to the above two kinds, and other connection manners of the abutting portion 32611 and the actuating portion 32622 are not introduced in detail here, as long as the structure can achieve the following purposes: when the relative force between the abutting portion 32611 and the actuating portion 32622 exceeds a certain relative force, the abutting portion 32611 and the actuating portion 32622 can be relatively disengaged and the actuating portion 32622 can slide relative to the abutting portion 32611 (at this time, it is the second cooperation state). Specifically, in the first rotation direction b1, the abutting portion 32611 and the actuating portion 32622 are matched; in the second rotation direction b2, when the relative force between the abutting portion 32611 and the actuating portion 32622 does not exceed a certain relative force, the abutting portion 32611 and the actuating portion 32622 are matched, and when the relative force between the abutting portion 32611 and the actuating portion 32622 exceeds a certain relative force, the abutting portion 32611 and the actuating portion 32622 can be relatively disengaged and the actuating portion 32622 can slide relative to the abutting portion 32611. The condition of the certain relative force is that the clamping end head 31 has clamped the driving assembly 100, and the clamping end head 31 does not need to move inwards again.

[0074] In this application, reference is made to Figure 3 , Figure 4 and Figure 5The execution component 32 further comprises an elastic member 323 arranged between the actuating part 32622 and the force applying member 321, and the elastic member 323 is configured to always apply an elastic force to the actuating part 32622 to press the driving member 3261, so that the abutting part 32611 can at least partially always be kept in abutment with the actuating part 32622 in the axial direction. The elastic member 323 can be a spring or an elastic gasket, and the shape and material of the elastic member 323 are not limited here as long as the above-mentioned effect can be achieved.

[0075] By arranging the elastic member 323, the actuating member 3262 and the force applying member 321 can have a certain space in the axial direction, so that when the actuating member 3262 and the actuating member 3262 are separated, the actuating member 3262 can be automatically reset, and the feedback effect of the sliding sound can be ensured.

[0076] In addition, in order to prevent the elastic force of the elastic member 323 from wearing the driving member 3261 and the actuating part 32622, in the present application, the execution component 32 further comprises a first gasket 324 arranged between the elastic member 323 and the driving member 3261, and a second gasket 325 arranged between the elastic member 323 and the actuating part 32622.

[0077] As mentioned above, the actuating member 3262 is arranged between the driving member 3261 and the force applying member 321 to transmit the driving force of the force applying member 321 to the driving member 3261, and in the present embodiment, the driving member 3261 is limited to a fixed position by the force applying member 321.

[0078] Please refer to Figures 3-8The force applying member 321 is a cylindrical shell with an opening facing the clamping head 31, and the driving member 3261, the actuating member 3262, the first gasket 324, the elastic member 323 and the second gasket 325 are all accommodated in the cavity of the cylindrical shell 321. The outer side of the mounting portion 2 is formed with an accommodating cavity 21, and the opening of the cylindrical shell 321 is inserted into the accommodating cavity 21, so that the force applying member 321 is limited in the radial direction by the mounting portion 2. The inside of the cylindrical shell 321 is formed with a clamping structure 3211, which includes a first portion 3211a extending in the radial direction from the inner side wall of the cylindrical shell 321, a second portion 3211b extending from the first portion 3211a towards the clamping head 31 near the axis, and a third portion 3211c extending from the second portion 3211b towards the axis near the clamping head 31. The clamping structure 3211 divides the cavity into spaces to accommodate the driving member 3261, the actuating member 3262, the first gasket 324, the elastic member 323 and the second gasket 325. Specifically, the clamping structure 3211 divides the cavity into a first space, a second space and a third space, wherein the first space accommodates the driving member 3261, and the second space accommodates the actuating member 3262, the first gasket 324, the elastic member 323 and the second gasket 325. The driving member 3261 is clamped between the third portion 3211c and the accommodating cavity 21, and the actuating member 3262 is located between the second portion 3211b and the cylindrical shell 321. The actuating member 3262 is sleeved on the second portion 3211b and can slide in the axial direction on the second portion 3211b. The first gasket 324, the elastic member 323 and the second gasket 325 are also sleeved on the second portion 3211b, and the end face of the first gasket 324 is attached to the first portion 3211a. By sleeving the first gasket 324, the elastic member 323 and the second gasket 325 on the second portion 3211b, the elastic member 323 can be limited by the first portion 3211a, so that there is no need to additionally set a limiting part for fixing the elastic member 323, and the overall structure is simpler and more compact.

[0079] Since the force applying member 321 needs to drive the actuating member 3262 to rotate when rotating, a circumferential limiting structure is arranged between the force applying member 321 and the actuating member 3262 to limit the relative rotation of the force applying member 321 and the actuating member 3262. The axial limiting structure can adopt a known connecting structure, such as a clamping structure, a fastener, welding, etc.

[0080] But, in the embodiment, since the actuating member 3262 can move in the axial direction relative to the force applying member 321 under the driving of the elastic member 323, the axial restriction structure needs to have a certain movable space in the axial direction while achieving the circumferential restriction. In the embodiment, the circumferential restriction structure adopts the following scheme: the circumferential restriction structure includes a protrusion (i.e., the aforementioned connecting part 32621) formed on one of the force applying member 321 and the actuating member 3262, and a slot (i.e., the aforementioned matching part) formed on the other one and matched with the protrusion 32621. The length of the slot in the axial direction of the force applying member 321 is greater than the length of the protrusion 32621, and the width of the slot in the circumferential direction of the force applying member 321 is matched with the width of the protrusion 32621, so that the protrusion 32621 can slide in the slot in the axial direction but cannot move relative to the slot in the circumferential direction. Specifically, the protrusion 32621 is formed in a radial direction outward from the outer circumferential surface of the actuating member 3262, and the slot is formed on the inner wall of the cylindrical shell 321.

[0081] Of course, if the elastic member 323 is not provided and the force applying member 321 is not limited to rotate only in the circumferential direction, the actuating member 3262 can be fixed or welded on the force applying member 321 by fasteners, i.e., the actuating member 3262 is completely fixedly connected with the force applying member 321. In this case, when the force applying member 321 is rotated, in addition to the rotational force applied on the force applying member 321, a pressing force needs to be applied in the axial direction to enable the actuating member 3262 to engage with the driving member 3261.

[0082] The force applying member 321 is locked on the connecting screw 3263 in the axial direction, specifically, the end (the matching section 3263d) of the connecting screw 3263 away from the clamping end extends into the cavity of the force applying member 321, and a nut 3271 is locked on the end, the nut 3271 is located outside the driving member 3261 and a stop washer 3272 is arranged between the nut 3271 and the driving member 3261. The stop washer 3272 and the driving member 3261 are sequentially fixed on the matching section 3263d in the axial direction of the connecting screw 3263, wherein the end surface of the driving member 3261 facing the outside is formed with a groove 32614 accommodating the third part 3211c, and the depth of the groove 32614 is greater than the thickness of the third part 3211c, so that the force applying member 321 can move relative to the driving member 3261 in the axial direction.

[0083] In order to facilitate the assembly of the transmission assembly 326, the connecting screw 3263 and the force applying member 321, an assembly opening 3212 is formed on the end surface of the force applying member 321 relative to the opening, and the assembly opening 3212 is closed by a cap 3273 which partially extends into the third space. The assembly mode of the transmission assembly 326, the connecting screw 3263 and the force applying member 321 is as follows:

[0084] When the connecting screw 3263 is installed on the mounting portion 2, the driving member 3261 is installed on the connecting screw 3263, at this time, the driving member 3261 is located in the accommodating cavity 21, at the same time, the second gasket 325, the elastic member 323, the first gasket 324 and the actuating member 3262 are sequentially sleeved on the second portion 3211b, wherein the second gasket 325 can be in interference fit with the second portion 3211b, the end of the elastic member 323 close to the second gasket 325 is fixed on the second gasket 325 or the force applying member 321, so as to prevent the second gasket 325 and the elastic member 323 from moving axially, the first gasket 324 and the actuating member 3262 can be in clearance fit with the second portion 3211b, so that the two can move axially on the second portion 3211b;

[0085] The force applying member 321 installed with the second gasket 325, the elastic member 323, the first gasket 324 and the actuating member 3262 is assembled to the mounting portion 2, the open end of the force applying member 321 is inserted between the mounting portion 2 and the driving member 3261, so that the force applying member 321 is limited in the radial direction, at this time, the third portion 3211c extends into the groove portion 32614, and the connecting screw 3263 extends into the cavity;

[0086] The stop gasket 3272 is installed to the connecting screw 3263 through the assembling opening 3212, and the nut 3271 is locked to the connecting screw 3263; finally, the cap 3273 is installed to the force applying member 321 to close the assembling opening 3212.

[0087] Here, it needs to be explained that a gap is formed between the stop gasket 3272 and the inner wall of the groove portion 32614 (i.e. a gap is formed between the stop gasket 3272 and the driving member 3621 in the axial direction), the third portion 3211c extends into the gap and can move axially in the gap, the purpose of such arrangement is that when the driving member 3261 and the actuating member 3262 are separated, and the force applying member 321 is removed from the rotating force, since the elastic member 323 is in the force storage state at this time, and the plane of the first inclined tooth surface 32612 abuts against the plane of the second inclined tooth surface 32623, the elastic member 323 will push the force applying member 321 to move outward until the third portion 3211c is blocked by the stop gasket 3272 and cannot move outward, thus, it can be ensured that the driving member 3261 and the actuating member 3262 are in the separated state in the subsequent process.

[0088] Please refer to Figure 2In an alternative embodiment, the fixing device 300 further comprises a strap (not shown). The strap is used to fix the base 1 on the patient's body, for example, the thigh, so as to fix the driving assembly 100 on the patient's body. It is true that in other embodiments, the fixing device 300 can be fixed on the patient's body in other ways. For example, the base 1 is provided with a connecting member for clamping on the patient's body. The connecting member can be a locking member locked on the waistband or the like clothes.

[0089] In addition, the strap can not belong to the fixing device 300. The fixing device 300 can be provided with only a connecting portion for connecting the strap. For example, the base 1 is provided with a strap port 12 for the strap to pass through. Alternatively, in other embodiments, the fixing device 300 is used to be inserted into the clothes of the patient.

[0090] The technical features of the above embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described. However, as long as the combinations of the technical features do not contradict, they should be considered as the scope of the description.

[0091] The above embodiments only express several implementation manners of the utility model, and the description is more specific and detailed. However, it should not be understood as the limitation of the scope of the utility model patent. It should be pointed out that for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model.

Claims

1. A fixing device for an interventional catheter pump, characterized in that, The interventional catheter pump comprises a catheter, a driving assembly connected to the proximal end of the catheter, a pump head connected to the distal end of the catheter, the driving assembly is used to drive the pump head to act to pump blood, the fixing device comprises: a base bearing the driving assembly; mounting portions provided on two opposite sides of the base; the base and the mounting portions constitute a containing space of the driving assembly; a clamping mechanism provided on at least one of the mounting portions, used to operatively fix the driving assembly between the mounting portions; wherein, the clamping mechanism comprises a clamping end head located on the side of the mounting portion facing the containing space, and an executing component located on the side of the mounting portion away from the containing space; the clamping end head is configured to move towards or away from the driving assembly when the executing component is operated, so as to clamp or release the driving assembly.

2. The fixture of claim 1, wherein The fixing device further comprises a bandage passing through the base, used to operatively fix the fixing device on the patient.

3. The fixture of claim 1, wherein At least one side wall of the driving assembly is inwardly recessed to form an axial waistline groove, the clamping end head can abut against the waistline groove and match.

4. The fixture of claim 1, wherein The executing component comprises a force applying member, and a transmission assembly connecting the force applying member and the clamping end head, the transmission assembly is adapted to convert the rotary motion of the force applying member into the linear motion of the clamping end head.

5. The fixture of claim 4, wherein The transmission assembly further comprises an information feedback assembly, the information feedback assembly is at least partially located between the force applying member and the clamping end head, and the information feedback assembly emits feedback information after the clamping end head abuts against the driving assembly.

6. The fixture of claim 5, wherein The information feedback assembly further comprises a driving member, and an actuating member provided between the driving member and the force applying member; the transmission assembly further comprises a connecting screw connecting the driving member and the clamping end head; the driving member and the actuating member have a first matching state and a second matching state; wherein, when the driving member and the actuating member are in the first matching state, the force applying member drives the clamping end head to move inwardly or outwardly; when the driving member and the actuating member are in the second matching state, the force applying member drives the actuating member to move relative to the driving member.

7. The fixture of claim 6, wherein The end of the driving member facing the actuating member is provided with a docking portion, the actuating member has an actuating portion matched with the docking portion, when the relative force between the docking portion and the actuating portion exceeds a certain relative force in the second matching state, the docking portion and the actuating portion can relatively disengage and the actuating portion can slide relative to the docking portion.

8. The fixture of claim 7, wherein The executing component further comprises an elastic member, the elastic member is provided between the actuating portion and the force applying member, and the elastic member is configured to always apply an elastic force to the actuating portion to press the driving member.

9. The fixture of claim 8, wherein, One of the force applying member and the actuating member is formed with a notch, and the other is formed with a protrusion, the length of the notch in the axial direction of the force applying member is greater than the length of the protrusion, and the width of the notch in the circumferential direction of the force applying member is matched with the width of the protrusion.

10. The fixture of claim 8, wherein, The force applying member is provided with a clamping structure, which has a first part extending in the radial direction and a second part extending from the first part towards the clamping head along the central axis.

11. The fixture of claim 10, wherein, The clamping structure further comprises a third part extending from the second part towards the central axis along the direction of the clamping head; the connecting screw extends into the cavity of the force applying member from the end of the clamping head, and is provided with a nut, which is located outside the driving member and is provided with a stop washer between the driving member and the connecting screw, which are sequentially fixed on the connecting screw along the axial direction of the connecting screw, and a gap is formed between the stop washer and the driving member along the axial direction, and the third part extends into the gap and can move in the gap along the axial direction.

12. The fixture of claim 6, wherein, The transmission assembly comprises a driving member; the transmission assembly further comprises a connecting screw connecting the driving member and the clamping end; the driving member and the force applying member are in a first matching state and a second matching state; wherein, When the driving member and the force applying member are in the first matching state, the force applying member drives the clamping head to move towards the inside or the outside; When the driving member and the force applying member are in the second matching state, the force applying member moves relative to the driving member.

13. The fixture of claim 12, wherein, The end of the driving member towards the actuating member is provided with a docking part, and the force applying member is provided with an actuating part matched with the docking part, and when the relative force between the docking part and the actuating part exceeds a certain relative force in the second matching state, the docking part and the actuating part can relatively disengage and the actuating part can slide relative to the docking part.

14. The fixture of claim 7 or 13, wherein, The matching between the actuating part and the docking part is tooth engagement.

15. The fixture of claim 14, wherein, The docking part and the actuating part are straight tooth engagement in a first rotation direction and are helical tooth engagement in a second rotation direction; wherein the first rotation direction is the rotation direction when the force applying member drives the clamping head to move towards the outside of the mounting part; and the second rotation direction is the rotation direction when the force applying member drives the clamping head to move towards the inside of the mounting part.

16. The fixture of claim 15, wherein, The docking part and the actuating part comprise a helical tooth surface for realizing the helical tooth engagement, which has a plane forming a tooth top surface and a helical surface extending from a tooth groove towards the tooth top surface.

17. The fixture of claim 6 or 12, wherein, The connecting screw penetrates the mounting part, and a reinforcing member is arranged between the mounting part and the connecting screw, which is fixed in the mounting part and is in threaded connection with the connecting screw.

18. The fixture of claim 1, wherein, The fixing device further comprises a guide part, and the clamping head is driven to move towards the inside or the outside along the guide part.

19. An interventional catheter pump system, characterized by The driving assembly comprises a motor housing and a motor accommodated in the motor housing; ​ The working assembly comprises a catheter, a drive shaft arranged in the catheter, a pump head connected to a distal end of the catheter, a proximal end of the drive shaft being drivingly connected to the motor to receive a rotating force of the motor; the pump head comprises a pump housing having an inlet and an outlet, and an impeller accommodated in the pump housing, the impeller being connected to a distal end of the drive shaft; when the impeller rotates, blood can be sucked into the pump housing from the inlet and pumped out of the pump housing from the outlet; The fixing device is adapted to fix the working assembly, and the fixing device is the fixing device according to any one of claims 1-18.

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