Driving assembly of intrusive working assembly and intrusive medical instrument device

Abstract

The invention discloses a driving assembly of an intrusive working assembly and an intrusive medical instrument device, and relates to the field of medical instruments, the driving assembly comprises a motor, a driving part, a first joint part and a rotating speed detection element, the driving part is provided with a first magnetic force providing part, and the rotating speed detection element is in a sheet shape and is connected with the wall surface of the first joint part. According to the scheme, the sheet-shaped rotating speed detection element can be arranged on the wall face of the first joint part on the driving assembly side, so that the sheet-shaped rotating speed detection element can be contained in a narrow gap, a large-size rotating speed sensor does not need to be additionally arranged, and the size and the structural complexity of the intrusive working assembly can be reduced; and the cost of the intrusive working assembly as a consumable can be reduced. Meanwhile, the rotating speed detection element is arranged in the gap of the first joint part on the driving assembly side, the original structural design of the driving assembly is not affected, the influence of heating of the rotating speed detection element on the intrusive working assembly is reduced or avoided, and the safety of the intrusive working assembly to the human body is improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a drive assembly for an interventional working component and an interventional medical device device. Background Technology

[0002] Interventional medical devices, such as percutaneous ventricular assist devices, mainly include a motor, an active rotor, and working components that intervene in the human body during use, such as in an interventional blood pump. After the motor is powered on, it drives the active rotor to rotate. The active rotor can magnetically drive the driven rotor in the interventional blood pump to rotate, which in turn drives the impeller located in the heart of the interventional blood pump to rotate, thereby realizing blood pumping.

[0003] During the operation of an interventional blood pump, the impeller speed needs to be monitored and adjusted in real time to regulate blood flow. Because the motor of the interventional blood pump is externally mounted, the active and driven rotors are magnetically coupled, resulting in a very narrow gap between them. This makes it difficult to install standard-sized speed sensors, such as encoders and Hall effect sensors, which require specific installation space. Installing encoders and Hall effect sensors in other locations on the interventional blood pump would increase its size and motor load, contradicting clinical application requirements.

[0004] Therefore, percutaneous ventricular assist devices mainly rely on encoders and Hall sensors inside the motor to detect the motor speed for user reference. However, there may be a speed difference between the active rotor and the driven rotor driven by the motor, and the actual speed of the impeller inserted into the human body in the interventional blood pump is difficult to detect and display. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide a drive assembly for an interventional working component and an interventional medical device, wherein a thin-film speed detection element disposed in the drive assembly detects the actual speed of the driven component in the interventional working component.

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

[0007] A drive assembly for an interventional working component, the drive assembly being detachably connected to the interventional working component; the drive assembly comprising:

[0008] Electric motor;

[0009] An active member driven by the motor has a first magnetic force provider for coupling with a second magnetic force provider in the interventional working assembly to magnetically drive the driven member in the interventional working assembly to rotate.

[0010] A first engagement component is used to connect with a second engagement component in the interventional working assembly;

[0011] The rotational speed detection element has a sensing element for coupling with the second magnetic force provider to detect the rotational speed of the driven member; the rotational speed detection element is in the form of a thin sheet and is connected to the wall surface of the first engaging member.

[0012] Optionally, in the drive assembly of the above-mentioned interventional working component, one of the first engagement component and the second engagement component is configured as an outer sleeve, and the other is configured as an inner sleeve, wherein the inner sleeve is inserted into the outer sleeve; the rotational speed detection element is located in the gap on one side of the first engagement component.

[0013] Optionally, in the drive assembly of the above-mentioned interventional working component, the first engaging member is configured as a first outer sleeve, the second engaging member is configured as a first inner sleeve, and there is a first gap between the inner wall of the first outer sleeve and the outer wall of the first inner sleeve.

[0014] The rotational speed detection element is located within the first gap and is connected to the inner wall of the first outer sleeve.

[0015] Optionally, in the driving component of the above-mentioned interventional working component, the inner wall of the first outer sleeve includes a first inner peripheral surface, the outer wall of the first inner sleeve includes a first outer peripheral surface, and there is a first annular gap between the first inner peripheral surface and the first outer peripheral surface, the first gap including the first annular gap.

[0016] The rotational speed detection element is in the shape of a flexible sheet, at least a portion of the rotational speed detection element is located within the first annular gap, and the rotational speed detection element is connected to at least a portion of the curved surface of the first inner circumferential surface in a bent state.

[0017] At least a portion of the sensing element overlaps with the second magnetic force provider in the radial direction.

[0018] Optionally, in the drive assembly of the above-mentioned interventional working component, the drive assembly further includes a washer disposed within an inner cavity defined by the first inner circumferential surface, the washer being located at the distal end of the inner cavity, and the rotational speed detection element being at least partially connected to the inner circumferential surface of the washer.

[0019] Optionally, in the drive assembly of the aforementioned interventional working component, at least a portion of the washer overlaps with the driving member in the axial direction, and the washer is located on the distal side of the driving member.

[0020] Optionally, in the driving component of the above-mentioned interventional working component, the inner wall of the first outer sleeve includes a first inner end face, the outer wall of the first inner sleeve includes a first outer end face, and there is a first end face gap between the first inner end face and the first outer end face, the first gap including the first end face gap;

[0021] At least a portion of the speed detection element is located within the gap of the first end face, and the speed detection element is connected to the first inner end face;

[0022] At least a portion of the sensing element overlaps with the second magnetic force provider in the axial direction.

[0023] Optionally, in the drive assembly of the above-mentioned interventional working component, the first engaging member is configured as a first outer sleeve, and the second engaging member is configured as a first inner sleeve.

[0024] The active component is inserted inside the first outer sleeve, and there is a second gap between the inner wall of the first outer sleeve and the outer wall of the active component;

[0025] The rotational speed detection element is located within the second gap and is connected to the inner wall of the first outer sleeve.

[0026] Optionally, in the driving assembly of the above-mentioned interventional working component, the inner wall of the first outer sleeve includes a first inner peripheral surface, the outer wall of the active component includes a second outer peripheral surface, and a second annular gap is provided between the first inner peripheral surface and the second outer peripheral surface, the second gap including the second annular gap;

[0027] The rotational speed detection element is in the shape of a flexible sheet, at least a portion of the rotational speed detection element is located within the second annular gap, and the rotational speed detection element is connected to at least a portion of the curved surface of the first inner circumferential surface in a bent state.

[0028] At least a portion of the sensing element overlaps with the second magnetic force provider in the radial or axial direction.

[0029] Optionally, in the drive assembly of the above-mentioned interventional working component, the first engaging member is configured as a second inner sleeve, the second engaging member is configured as a second outer sleeve, and a third gap is formed between the inner wall of the second outer sleeve and the outer wall of the second inner sleeve.

[0030] The rotational speed detection element is located within the third gap and is connected to the outer wall of the second inner sleeve;

[0031] The second outer sleeve has an inner wall including a second inner circumferential surface, and an outer wall including a third outer circumferential surface. A third annular gap exists between the second inner circumferential surface and the third outer circumferential surface, and the third gap includes the third annular gap. The rotational speed detection element is in the form of a flexible sheet, at least a portion of which is located within the third annular gap, and the rotational speed detection element is connected to at least a portion of the curved surface of the third outer circumferential surface in a bent state. At least a portion of the sensing element overlaps with the second magnetic force providing element in the radial direction.

[0032] Alternatively, the inner wall of the second outer sleeve includes a second inner end face, the outer wall of the second inner sleeve includes a second outer end face, a second end face gap exists between the second inner end face and the second outer end face, and the third gap includes the second end face gap; at least a portion of the speed detection element is located within the second end face gap, and the speed detection element is connected to the second outer end face; at least a portion of the sensing element overlaps with the second magnetic force providing element in the axial direction.

[0033] Optionally, in the drive assembly of the aforementioned interventional working component, the first engaging member is configured as a second inner sleeve, and the second engaging member is configured as a second outer sleeve.

[0034] The active component is inserted into the second inner sleeve, and there is a fourth gap between the inner wall of the second inner sleeve and the outer wall of the active component.

[0035] The rotational speed detection element is located within the fourth gap and is connected to the inner wall of the second inner sleeve;

[0036] The inner wall of the second inner sleeve includes a third inner circumferential surface, and the outer wall of the active component includes a fourth outer circumferential surface. A fourth annular gap exists between the third inner circumferential surface and the fourth outer circumferential surface, and the fourth gap includes the fourth annular gap. The rotational speed detection element is in the shape of a flexible sheet, at least a portion of the rotational speed detection element is located within the fourth annular gap, and the rotational speed detection element is connected to at least a portion of the curved surface of the third inner circumferential surface in a bent state. At least a portion of the sensing element overlaps with the second magnetic force providing component in the radial direction.

[0037] Alternatively, the inner wall of the second inner sleeve includes a third inner end face, the outer wall of the driving member includes a third outer end face, a third end face gap exists between the third inner end face and the third outer end face, and the fourth gap includes the third end face gap; at least a portion of the speed detection element is located within the third end face gap, and the speed detection element is connected to the third inner end face; at least a portion of the sensing element overlaps with the second magnetic force providing member in the axial direction;

[0038] Alternatively, the driven member is inserted into the second outer sleeve, the driven member has a fourth outer end face, the fourth outer end face and the outer end face of the second inner sleeve have a fourth end face gap, at least a portion of the speed detection element is located in the fourth end face gap, and the speed detection element is connected to the outer end face of the second inner sleeve; at least a portion of the sensing element overlaps with the second magnetic force providing member in the axial direction.

[0039] Optionally, in the drive assembly of the above-mentioned interventional working component, the rotational speed detection element includes a flexible substrate, and the sensing element includes a coil, the coil being disposed on the flexible substrate.

[0040] Optionally, in the driving component of the above-mentioned interventional working component, the first magnetic force provider is a conductor or a magnet, and the second magnetic force provider is a magnet.

[0041] An interventional medical device includes the drive component and the interventional working component described in any one of the above.

[0042] Based on the above technical solution, in the solution provided in this application embodiment, when the motor is powered on and rotates, it drives the active component of the drive assembly to rotate. The first magnetic force providing component on the active component rotates with the active component. The first magnetic force providing component is coupled with the second magnetic force providing component on the driven component in the interlocking working assembly. When the first magnetic force providing component rotates, it generates a magnetic force that drives the driven component in the interlocking working assembly to rotate, thereby causing the driven component to rotate. When the driven component rotates, the second magnetic force providing component rotates with it. The sensing element on the thin-film speed detection element disposed in the gap on one side of the first connecting component senses the rotation of the second magnetic force providing component, and thus can detect the actual speed of the driven component. This speed is directly generated by detecting the change in the magnetic field generated by the second magnetic force providing component. The change in the magnetic field is closely related to the speed of the driven component, thereby ensuring the reliability of the measured speed of the driven component. Furthermore, this solution replaces the large speed sensors used in existing technologies with a thin-film speed detection element. This allows the speed detection element to be mounted on the wall of the first engagement component on the drive assembly side, enabling it to fit within a narrow gap and detect the actual speed of the driven component within the interventional working assembly, facilitating user reference. Additionally, the interventional working assembly eliminates the need for a large additional speed sensor, reducing its size and structural complexity, as well as lowering the cost of consumable components. Moreover, mounting the speed detection element on the wall of the first engagement component on the drive assembly side does not affect the original structural design of the drive assembly and reduces or eliminates the impact of heat generated by the speed detection element on the interventional working assembly, thus improving the safety of the interventional working assembly for human use. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the structure of a drive component for an interventional working component provided in the first embodiment of this application;

[0045] Figure 2 A schematic diagram of the flow path of the flushing fluid in the drive assembly of the interventional working component provided in the embodiments of this application;

[0046] Figure 3 A schematic diagram of a percutaneous ventricular assist device provided in an embodiment of this application;

[0047] Figure 4 A schematic diagram illustrating an application scenario of a percutaneous ventricular assist device provided in this application embodiment;

[0048] Figures 5-7 This is a schematic diagram of the mesh shape of the internal support of the pump casing disclosed in an embodiment of this application;

[0049] Figure 8 This is a schematic diagram of the structure of a rotational speed detection element in an interventional working assembly provided in one embodiment of this application;

[0050] Figure 9 A schematic diagram showing the positional relationship between a first magnetic force provider, a second magnetic force provider, and a sensing element provided in an embodiment of this application;

[0051] Figure 10 This is a schematic diagram of the structure of the driving component of the interventional working component provided in the second embodiment of this application;

[0052] Figure 11 A schematic cross-sectional view of the first and second joining components provided in this application in the axial direction;

[0053] Figure 12 This is a schematic diagram of the structure of the driving component of the interventional working component provided in the third embodiment of this application;

[0054] Figure 13 This is a schematic diagram of the structure of the driving component of the interventional working component provided in the fourth embodiment of this application;

[0055] Figure 14 This is a schematic diagram of the drive component of the interventional working component provided in the fifth embodiment of this application;

[0056] Figure 15 This is a schematic diagram of the structure of the rotational speed detection element provided in the embodiments of this application;

[0057] Figure 16 and Figure 17 This is a flowchart illustrating the method for calculating the rotational speed of a driven member as provided in an embodiment of this application.

[0058] In the diagram: 1000, Percutaneous ventricular assist device; 100, Drive assembly; 300, Interventional blood pump; 200, Interventional working assembly; 310, Catheter; 320, Pump head assembly; 330, Flexible support; 201, Infusion port; 322, Blood inlet; 321, Blood outlet; 1, Motor; 2, Actuator; 3, First engagement component; 4 (4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h, 4i, 4j, 4k, 4m, 4n), Speed ​​detection element; 41, Sensing element; 5, Second engagement component; 6, Driven component; 7, Washer; 21, First magnetic force provider; 61, Second magnetic force provider; 01, Support element; 2012, Irrigation fluid infusion channel; 2011, Irrigation fluid return channel; 31, Rotor chamber; 301, Shaft. Detailed Implementation

[0059] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] Interventional medical devices, a significant breakthrough in modern medicine, can precisely reach lesions through minimally invasive, image-guided incisions. With their significant advantages of minimal trauma, rapid recovery, and fewer complications, they are widely used in cardiovascular emergencies, cancer treatment, and vascular disease management. (Reference) Figure 1 The interventional medical device has a drive assembly 100 and an interventional working assembly 200, which can be detachably connected. The drive assembly 100 has a motor 1 and an active element 2 driven by the motor 1. The active element 2 can be considered as a rotor, and the active element 2 can be driven to rotate by the motor 1 located outside the body.

[0061] The interventional working component 200 includes a driven component 6 (which can also be considered a rotor) coupled to the driving component 2 in the drive component 100, a rotating shaft 301 connected to the driven component 6, and a mechanical device connected to the rotating shaft 301. In use, the mechanical device is located inside the body, while the drive component 100 is located outside the body. The drive component 100 drives the mechanical device to move outside the body. The driving component 2 and the driven component 6 are coupled to each other. When the external motor 1 rotates, it drives the driving component 2 inside the drive component 100 to rotate. The rotation of the driving component 2 generates a changing magnetic field, which acts on the driven component 6, causing the driven component 6 to rotate. In turn, the rotation of the driven component 6 drives the rotating shaft 301 inserted into the body to rotate. Under the rotation of the rotating shaft 301, the mechanical device installed at the other end of the rotating shaft 301 and located inside the human body moves accordingly.

[0062] Interventional medical devices come in a variety of types, including percutaneous ventricular assist devices (VADs). The interventional working component of a VAD can be an interventional blood pump, with its shaft housed within a catheter and introduced into the body through the catheter. For interventional blood pumps, the aforementioned internal mechanical device can be an impeller.

[0063] Interventional medical devices can also be any type of interventional equipment that drives the rotation of a mechanical device located in the body via an external rotor, such as thrombectomy devices, thrombectomy stent drive devices, microcatheter rotation control systems, and neurointervention drive systems.

[0064] The aforementioned interventional working component also includes a catheter 310. To prevent damage to internal tissues when the rotating shaft 301 rotates, the rotating shaft 301 can be disposed within the catheter 310. The proximal end of the catheter 310 has an opening facing the distal end of the driven member 6, allowing the catheter 310 to mate with the lead-out portion of the rotating shaft 301 of the driven member 6, thus inserting the rotating shaft 301 into the catheter 310. To allow the rotating shaft 301 to bend and advance freely within the human body, the catheter 310 can be a flexible catheter, and the rotating shaft 301 can be a flexible rotating shaft. The proximal end of the flexible rotating shaft is fixedly connected to the driven member 6, and the flexible rotating shaft is rotatably disposed within the catheter 310. When the driven member 6 rotates, it drives the flexible rotating shaft to rotate within the catheter 310, ultimately transmitting the torque generated by the rotation to the mechanical device, causing the mechanical device to move. Specifically, the mechanical device can be a rotating component disposed at the distal end of the flexible rotating shaft. The rotating component can rotate under the drive of the rotating shaft 301. In use, the rotating component is located inside the body, and the drive component 100 drives the rotating component to rotate externally.

[0065] See Figure 1In an exemplary embodiment, the interventional working assembly 200 has a second engagement member 5, which has a rotor chamber 31 for receiving a follower 6. The follower 6 is correspondingly disposed in the rotor chamber 31 within the second engagement member 5, and the follower 6 can rotate smoothly within the rotor chamber 31.

[0066] There is a certain gap between the rotor chamber 31 and the driven member 6, and a certain gap between the conduit 310 and the rotating shaft 301. A small amount of air exists within these gaps. If this air is not removed, the interventional working component 200 may allow this air to enter the human body through the conduit 310 during operation, potentially causing harm. Therefore, to remove air from the interventional working component 200 and prevent blood from flowing back through the aforementioned gaps, the interventional working component also includes a flushing fluid infusion channel 2012 and a flushing fluid return channel 2011. The driven member 6 has a hollow cavity. The flushing fluid infusion channel 2012 is in fluid communication with both the conduit 310 and the hollow cavity, and the hollow cavity is also in fluid communication with the rotor chamber 31. The flushing fluid return channel 2011 is in fluid communication with the rotor chamber 31. See also... Figure 2 In use, after the flushing fluid enters the interventional working component 200 through the flushing fluid injection channel 2012, a portion enters the conduit 310 and flows to the distal end of the conduit 310 (in the various components of the technical solution disclosed in this application, the end of the component closer to the operator is called the proximal end of the component, and the other end is called the distal end of the component) to expel the air in the conduit 310. The other portion enters the rotor chamber 31 through the hollow cavity to cool the driven member 6 and flows out from the flushing fluid return channel 2011 to the outside of the interventional working component 200, thereby expelling the air in the rotor chamber 31.

[0067] In one specific embodiment, the above-mentioned interventional medical device is a percutaneous ventricular assist device. Please refer to [link to relevant documentation]. Figure 3 , Figure 3 This is a schematic diagram of a percutaneous ventricular assist device provided in an embodiment of this application. Figure 3 As shown, the percutaneous ventricular assist device 1000 includes the aforementioned drive assembly 100 and an interventional blood pump 300, which is detachably mounted on the drive assembly 100. The interventional blood pump 300 is the interventional working component in the percutaneous ventricular assist device. The percutaneous ventricular assist device 1000 can be applied in scenarios requiring guidewire intervention. The internal structures of the drive assembly 100 and the interventional blood pump 300 can be referenced. Figure 1 As shown, Figure 1 The interventional working component 200 shown is specifically illustrated with the interventional blood pump 300 as an example interventional working component.

[0068] The interventional blood pump 300 includes a catheter 310, a pump head assembly 320, and a flexible support 330. The catheter 310 has a flexible rotating shaft ( Figure 3 Not shown in the diagram, the flexible rotating shaft can be referenced. Figure 1 The rotating shaft 301 is inserted inside the catheter 310. In use, the drive assembly 100 is typically located outside the subject (who can be a human body), while the pump head assembly 320 can be inserted into the subject's body, specifically in the left ventricle, for example... Figure 4 As shown, this device assists the heart in pumping blood, reducing the burden on the heart. The pump head assembly 320 can assist the left ventricle by pumping blood from the left ventricle into the aorta. Of course, the pump head assembly 320 can also be inserted into other target locations of the subject via interventional surgery, for example, the pump head assembly 320 can be inserted into the right ventricle, and the percutaneous ventricular assist device 1000 can be used to assist the right ventricle. Furthermore, the pump head assembly 320 can also be inserted into blood vessels or other organs.

[0069] The flexible support 330 is connected to the distal end of the pump head assembly 320. During the insertion of the pump head assembly 320 into the subject's body, the flexible support 330 guides the insertion of the pump head assembly 320 and other components. After the pump head assembly 320 and other components are inserted into the desired position in the body, during operation of the percutaneous ventricular assist device 1000, the flexible support 330 maintains the posture of the pump head assembly 320 in the heart, thereby avoiding damage to the patient's tissues. In some embodiments, the distal end of the flexible support 330 is a flexible end that can support the ventricular wall in a non-invasive or non-damaging manner, separating the blood inlet of the pump head assembly 320 from the ventricular wall. The distal end of the flexible support 330 can be arc-shaped, or it can be a coiled flexible tail, such as... Figure 3 As shown. Those skilled in the art should understand that the illustrated shape is merely exemplary, and the flexible support 330 can be in any other suitable shape, as long as it achieves the above-described purpose.

[0070] exist Figure 3 In the percutaneous ventricular assist device shown, the catheter 310 has a hollow structure, and a flexible rotating shaft passes through the interior of the catheter 310. In this embodiment, the drive assembly 100 includes a housing and a motor 1 located within the housing, the housing having an inner cavity to accommodate the motor 1. The transmission method between the motor 1 and the rotating shaft 301 can be magnetic coupling or eddy current coupling. After the drive assembly 100 is connected to the interventional blood pump 300, the driving element 2 at the distal end of the motor 1 is magnetically coupled to the driven element 6 in the interventional blood pump 300, so that the motor 1 can drive the rotating shaft 301 to rotate.

[0071] like Figure 3As shown, the interventional blood pump 300 is also provided with an infusion port 201, which is the coolant inlet of the flushing fluid infusion channel 2012. External infusion fluid can be injected into the catheter 310 and the interventional working component 200 through the infusion port 201 to flush or lubricate the bearings and other components in the interventional blood pump 300, and to remove internal air.

[0072] The distal end of catheter 310 is connected to pump head assembly 320. Pump head assembly 320 includes a pump housing, a support, and an impeller, with the impeller located inside the pump housing. The impeller may be a rotating component located distal to a flexible shaft (i.e., shaft 301) in the interventional blood pump 300. In use, the rotating component is located inside the body, as with the impeller described above, and the drive assembly 100 drives the rotating component to rotate externally.

[0073] The pump casing contains an internal support structure, which can be a metal lattice made of alloys such as nickel or titanium. This metal lattice has a mesh design, and the shape of the mesh can be customized to meet specific requirements. For example, it can be... Figures 5-7 The mesh shape of any one of the components is designed to allow the support to expand and contract in the radial direction. When the support expands in the radial direction, its diameter increases; when the support contracts in the radial direction, its diameter decreases. The pump housing also includes a diaphragm mounted on the support, with the middle portion of the support covered by the diaphragm to form a fluid channel. See [link to relevant documentation]. Figure 4 The stent has a blood inlet 322 in the area not covered by the diaphragm at its distal end. A blood outlet 321 is formed in the area not covered by the diaphragm at the proximal end of the stent. The stent also has distal legs extending distally from the blood inlet 322. The stent also has proximal legs extending proximally from the blood outlet 321. The distal legs are fixedly connected to the flexible support 330 and the distal bearing chamber, while the proximal legs are fixedly connected to the proximal bearing chamber and other components.

[0074] Specifically, the impeller is supported inside the bracket. The impeller includes a hub, which is fixed to the impeller shaft (the shaft portion used to fix the impeller in the aforementioned rotating shaft 301). Typically, the hub has a central hole, and the impeller shaft passes through the central hole of the hub. The two ends of the impeller shaft are supported inside the pump casing by proximal and distal bearings.

[0075] The rotating shaft 301 is connected to the hub, specifically, the distal end of the rotating shaft (such as the impeller shaft mentioned above) can be connected to the impeller hub. When the motor 1 in the drive assembly 100 drives the active member 2 to rotate, it generates a changing magnetic field. The active member 2 magnetically drives the driven member 6 to rotate, which in turn drives the rotating shaft 301 to rotate. Since the impeller is connected to the distal end of the rotating shaft 301, the rotation of the rotating shaft 301 will drive the impeller to rotate. When the impeller is driven to rotate, it can draw blood from the ventricle into the pump housing from the blood inlet of the pump housing, and then pump it out from the blood outlet of the pump housing into the artery, thereby realizing the auxiliary pumping function of the pump head assembly 320 for the ventricle.

[0076] The aforementioned interventional blood pump 300 can be a foldable blood pump with a foldable pump head assembly 320. During the delivery phase of the interventional blood pump 300, the pump head 320 is radially compressed inside the sheath of the interventional sheath, delivering blood at a smaller diameter to improve the permeability of the interventional blood pump 300 within the body and reduce damage to the human body. After the interventional blood pump 300 has delivered blood to the designated location, such as after exiting the sheath, the pump head assembly 320 radially expands, restoring to a larger working diameter to obtain better hydraulic performance, such as supporting a larger flow rate.

[0077] The impeller speed in the aforementioned interventional blood pump 300 directly affects the blood flow rate. A faster impeller speed results in a larger blood flow rate, and vice versa. Therefore, detecting the speed of the built-in rotor (such as the driven component or impeller) in the interventional working component 200 during the operation of the interventional blood pump 300 is crucial. The impeller speed is determined by the speed of the shaft 301, which in turn is determined by the speed of the driven component 6 in the interventional working component 200. There is a speed difference between the driving component 2 driven by the motor 1 and the driven component 6. Simply detecting the speed of the motor 1 or the driving component 6 is insufficient to determine the actual impeller speed.

[0078] To accurately detect the rotational speed of the built-in rotor in the interlocking working assembly 200, the drive assembly 100 also includes a speed detection element for detecting the actual rotational speed of the driven member. See [link to relevant documentation]. Figure 1 This application provides a drive component 100 for an interventional working component, which can be detachably connected to the interventional working component 200.

[0079] The aforementioned drive assembly 100 includes: a motor 1, a driving member 2 driven by the motor 1, a first engagement member 3, and a speed detection element 4. The aforementioned interventional working assembly 200 includes a driven member 6 and a second engagement member 5. The various parts of the drive assembly 100 and the interventional working assembly 200 are described below:

[0080] Regarding motor 1, the output shaft 11 of motor 1 is connected to the driving member 2, so that motor 1 drives the driving member 2 to rotate, such as... Figure 1 The proximal end of the driving member 2 is provided with an insertion hole that matches the output shaft 11 of the motor 1. The insertion hole can be a non-circular hole structure. The cross-sectional shape of at least the end of the output shaft 11 of the motor 1 matches the shape of the insertion hole, so that when the output shaft 11 of the motor 1 rotates, it drives the driving member 2 to rotate through the insertion hole. Of course, a through hole can also be provided in the area of ​​the output shaft 11 corresponding to the insertion hole. A through hole is also provided at the position of the proximal end of the driving member 2 corresponding to the through hole of the output shaft 11. A pin passes through these two through holes to connect the output shaft 11 of the motor 1 and the driving member 2 together. The type of motor 1 can be selected according to design requirements. For example, the motor 1 can be a brushless DC motor (BLDC), a frameless motor, or a hollow shaft motor. In this application, the preferred motor 1 is a brushless DC motor.

[0081] Regarding the active component 2, the active component 2 can be driven to rotate by the motor 1. The active component 2 has a first magnetic force providing component 21, which is used to couple with the second magnetic force providing component 61 in the interventional working assembly 200 to magnetically drive the driven component 6 in the interventional working assembly 200 to rotate. The second magnetic force provider 61 is disposed on the driven member 6 of the interventional working component 200. When the driving member 2 rotates under the drive of the motor 1, the first magnetic force provider 21 on the driving member 2 rotates accordingly. During the rotation process, the first magnetic force provider 21 generates a pushing / pulling force with the second magnetic force provider 61 on the driven member 6. For example, when the first magnetic force provider 21 moves away from the second magnetic force provider 61, the first magnetic force provider 21 generates a pulling force on the second magnetic force provider 61. When the first magnetic force provider 21 moves closer to the second magnetic force provider 61, the first magnetic force provider 21 generates a pushing force on the second magnetic force provider 61. Under the action of the pushing and pulling forces, the second magnetic force provider 61 is driven to rotate with the first magnetic force provider 21. The faster the rotation speed of the driving member 2, the faster the rotation speed of the driven member 6 will also be.

[0082] To enable a detachable connection between the drive assembly 100 and the interventional working assembly 200, the drive assembly 100 includes a first engaging member 3, and the interventional working assembly includes a second engaging member 5, allowing for a detachable connection between the two. Optionally, the first engaging member 3 may have a connecting portion for connecting with the second engaging member 5 of the interventional working assembly 200. The connecting portion matches the end of the second engaging member 5, allowing the end of the second engaging member 5 to be fixed in place, thereby enabling the connection between the interventional working assembly 200 and the drive assembly 100. The connecting portion may be a snap-fit ​​component for snapping onto the end of the second engaging member 5. Alternatively, the user may use screws, embedding, or other methods to achieve a detachable connection between the drive assembly 100 and the interventional working assembly 200.

[0083] When the drive assembly 100 is connected to the interventional working assembly 200, the end of the second engaging member 5 of the interventional working assembly 200 can be inserted into the connecting part of the first engaging member 3 of the drive assembly 100. After the end of the second engaging member 5 is inserted into the connecting part, the position of the first magnetic force providing member 21 on the driving member 2 corresponds to the position of the second magnetic force providing member 61 on the driven member 6, so that the first magnetic force providing member 21 and the second magnetic force providing member 61 are coupled. At this time, when the driving member 2 rotates, it will drive the driven member 6 to rotate through the coupled first magnetic force providing member 21 and second magnetic force providing member 61, thereby driving the rotating shaft 301 to rotate.

[0084] The first engaging component 3 serves as the outer shell of the driving component 2, protecting it from physical damage. The first engaging component 3 can be a barrel-shaped metal part. When the drive assembly 100 is operating, it is necessary to control the smooth rotation of the driving component 2 within the first engaging component 3. To ensure smooth rotation of the driving component 2, see [reference needed]. Figure 1 The drive assembly 100 also includes a support element 01. The support element 01 has a through hole that matches the proximal end of the driving member 2. The outer wall of the support element 01 is in contact with the inner wall of the first engaging member 3. At this time, the proximal end of the driving member 2 can rotate freely within the through hole of the support element 01. The support element 01 can provide a certain support for the driving member 2, ensuring stable rotation of the driving member 2. Specifically, the support element 01 can be a bearing structure. The outer diameter of the bearing matches the inner diameter of the first engaging member 3, and the inner diameter of the bearing matches the size of the proximal end of the driving member 2. The bearing-type support element 01 can reduce the resistance encountered by the driving member 2 during rotation, so that the rotation speed of the driving member 2 can be faster.

[0085] Regarding speed detection element 4, see [link / reference]. Figure 8 The rotational speed detection element 4 has a sensing element 41 for coupling with the second magnetic force provider 61 to detect the rotational speed of the driven member 6; the rotational speed detection element 4 is in the form of a thin sheet and is connected to the wall surface of the first engaging member 3. Optionally, the rotational speed detection element 4 is located in the gap on one side of the first engaging member 3.

[0086] Optionally, the aforementioned sensing element 41 can be a magnetic induction coil, which can detect the rotational speed of the driven member 6 by sensing the change in the magnetic field generated by the second magnetic force providing member 61; the rotational speed detection element 4 is configured as a thin sheet structure, so that it matches the shape of the wall surface of the first engaging member 3, thereby allowing it to fit into a narrow space. This narrow space can refer to the gap on one side of the first engaging member 3, and the gap can refer to the gap between the surface of the first engaging member 3 and the surface of other adjacent members. This gap can be the inherent gap of the first engaging member 3, and not a gap specifically reserved for the rotational speed detection element 4.

[0087] After the drive assembly 100 is connected to the interventional working assembly 200, the interventional medical device can be started. When the interventional medical device is working, the motor 1 is powered on and rotates. When the motor 1 rotates, it drives the active component 2 to rotate. The first magnetic force providing component 21 on the active component 2 rotates with the active component 2. The first magnetic force providing component 21 is coupled with the second magnetic force providing component 61 on the driven component 6 in the interventional working assembly. When the first magnetic force providing component 21 rotates, it generates a magnetic force that drives the second magnetic force providing component 61 in the interventional working assembly to rotate, thereby causing the second magnetic force providing component 61 to rotate with the first magnetic force providing component 21. According to Faraday's law of electromagnetic induction, a changing magnetic field will induce vortex electric fields in space. When a magnetic induction coil is in this changing magnetic field, the free electrons in the coil will move in a direction under the influence of the vortex electric field force, forming an induced current. At the same time, the rate of change of magnetic flux determines the magnitude of the induced electromotive force. As long as the magnetic flux changes due to factors such as magnetic induction intensity, coil area, or included angle, an induced electromotive force will be generated in the coil, which in turn generates an induced current, thus realizing the sensing of changes in the magnetic field. Therefore, when the second magnetic force provider 61 rotates with the first magnetic force provider 21, the magnetic field generated by the second magnetic force provider 61 and acting on the magnetic induction element 41 will change. This change in the magnetic field will be sensed by the sensing element 41, and a corresponding induced current will be output. The speed detection element 4 or the data processing device connected to the speed detection element 4 can calculate the speed of the second magnetic force provider 61 (the speed of the second magnetic force provider 61 is the speed of the driven element 6) based on the induced current, and generate an output signal adapted to the speed. The user can read the output signal of the speed detection element 4 through relevant equipment and identify the speed of the driven element 6 based on the output signal. Furthermore, the speed of the driven component 6 can be corrected by adjusting the speed of the motor 1 to achieve the set target flow rate or target speed.

[0088] As can be seen from the above scheme, in the scheme provided by this application, when the motor 1 is powered on and rotates, it drives the active component 2 of the drive assembly 100 to rotate. The first magnetic force providing component 21 on the active component 2 rotates with the active component 2. The first magnetic force providing component 21 is coupled with the second magnetic force providing component 61 on the driven component 6 in the interventional working assembly 200. When the first magnetic force providing component 21 rotates, it generates a magnetic force that drives the driven component 6 in the interventional working assembly 200 to rotate, thereby causing the driven component 6 to rotate. When the driven component 6 rotates, the second magnetic force providing component 61 rotates with it. The sensing element 41 on the thin-film speed detection element 4 set on one side wall of the first connecting component 3 senses the rotation of the second magnetic force providing component 61, and can detect the actual speed of the driven component 6. This speed is directly generated by detecting the change in the magnetic field generated by the second magnetic force providing component 61. The change in the magnetic field is closely related to the speed of the driven component 6, thereby ensuring the reliability of the measured speed of the driven component 6. Furthermore, by using a thin-film speed detection element 4 instead of the larger speed sensor in the prior art, this solution allows the speed detection element 4 to be mounted on the wall of the first engaging member 3 on the drive assembly 100 side, thus fitting within a narrow gap to detect the actual speed of the driven member 6 within the interventional working assembly 200, facilitating user reference. Additionally, the interventional working assembly 200 does not require an additional large speed sensor, reducing its size and structural complexity, as well as its cost as a consumable. Simultaneously, mounting the speed detection element 4 on the wall of the first engaging member 3 on the drive assembly 100 side does not affect the original structural design of the drive assembly 100, and reduces or avoids the impact of the heat generated by the speed detection element 4 on the interventional working assembly 200, such as preventing the temperature of the flushing fluid in the interventional working assembly 200 from exceeding a safety threshold, or preventing the driven member 6 from overheating, thus improving the safety of the interventional working assembly 200 for the human body.

[0089] In an exemplary embodiment, in order for the sensing element 41 to accurately detect the magnetic field change generated by the second magnetic force provider 61 during rotation, at least a portion of the sensing element 41 overlaps with the second magnetic force provider 61 in at least one direction, so that at least a portion of the magnetic field provided by the second magnetic force provider 61 acts on the sensing element 41, thereby ensuring that the sensing element 41 can sense the magnetic field change during the rotation of the second magnetic force provider 61. See [link to example]. Figure 1 At least one direction can refer to the axial direction X or the radial direction Y of the driving member 2. It should be noted that the Y direction in the attached figure refers to one of the radial directions of the driving member 2, and other radial directions can also be used as at least one of the above directions. The X direction refers to the axial direction of the driving member 2.

[0090] In an exemplary embodiment, when the first magnetic force provider 21 rotates, it also generates a changing magnetic field. In order to prevent or reduce the effect of this changing magnetic field on the sensing element 41 and interfere with the sensing element 41's detection of the rotation speed of the second magnetic force provider 61, or to reduce the signal processing complexity of the sensing element 41 for the sensing signal, the first magnetic force provider 21 does not overlap with the sensing element 41 in at least one of the above-mentioned directions, so as to reduce or avoid the influence of the first magnetic force provider 21 on the change of magnetic flux of the sensing element 41, so as to ensure that the sensing element 41 can effectively sense the change of magnetic field generated by the second magnetic force provider 61. In this solution, the specific detection principle of the sensing element 41 in detecting the change of magnetic field generated by the second magnetic force provider 61 can be referred to the above description, and will not be repeated here.

[0091] In an exemplary embodiment, in order for the sensing element 41 to accurately measure the rotational speed of the driven member 6, it is necessary to ensure that at least a portion of the magnetic field of the second magnetic force provider 61 can effectively act on the sensing element 41. Therefore, the sensing element 41 needs to have a first overlapping portion (the portion of the sensing element 41 facing the second magnetic force provider 61) that overlaps with the second magnetic force provider 61 in at least one of the aforementioned directions. The first overlapping portion is disposed opposite to the second magnetic force provider 61 and defines a sensing space. The first magnetic force provider 21 is located outside the sensing space. The sensing space refers to the space between the first overlapping portion of the sensing element 41 and the second magnetic force provider 61. When the second magnetic force provider 61 rotates, the magnetic field generated by the second magnetic force provider 61 in this space will change. This change will be sensed by the sensing element 41 and generate an induced current. In this embodiment, the first magnetic force provider 21 is set to be located outside the sensing space to prevent the first magnetic force provider 21 from interfering with or shielding the magnetic field in this space, thereby affecting the reliability of the detection result of the rotational speed detection element 4. If the first magnetic force provider 21 is located within the sensing space, it may cause the first magnetic force provider to interfere with / shield the magnetic field generated by the second magnetic force provider 61 within the sensing space, making it impossible for the sensing element 41 to sense the magnetic field generated by the second magnetic force provider 61, and thus impossible to effectively measure the rotational speed of the driven member 6.

[0092] In an exemplary embodiment, in order for the active member 2 to rotate and drive the driven member 6 to rotate, the first magnetic force provider 21 and the second magnetic force provider 61 need to be magnetically coupled. The aforementioned "at least one direction" includes the coupling direction between the first magnetic force provider 21 and the second magnetic force provider 61. The second magnetic force provider 61 and the sensing element 41 at least partially overlap in this coupling direction so that the sensing element 41 can detect the rotational speed of the second magnetic force provider 61. In order for the magnetic field generated by the rotation of the second magnetic force provider 61 when it is coupled with the first magnetic force provider 21 to be accurately sensed by the sensing element 41, the second magnetic force provider 61 includes a first portion d1 and a second portion d2. The first portion d1 overlaps with the first magnetic force provider 21 in the coupling direction to couple with the first magnetic force provider 21, and the second portion d2 overlaps with the sensing element 41 in the coupling direction so that the change in the magnetic field generated when it rotates can be accurately captured by the sensing element 41.

[0093] In an exemplary embodiment, the first magnetic force provider 21 and the second magnetic force provider 61 are magnetically coupled, such that when the first magnetic force provider 21 rotates with the driving member 2, it can provide a pushing force / pull force to the driven member 6. The magnitude of the pushing force / pull force is related to the magnitude of the magnetic flux acting on the driven member 6 by the first magnetic force provider 21. The larger the magnetic flux acting on the driven member 6, the larger the pushing force / pull force; the smaller the magnetic flux acting on the driven member 6, the smaller the pushing force / pull force. Therefore, in order to make the magnetic flux acting on the driven member 6 by the first magnetic force provider 21 greater, the overlapping area of ​​the first magnetic force provider 21 and the second magnetic force provider 61 can be made as large as possible. At this time, the first magnetic force provider 21 can generate a greater force on the second magnetic force provider 61, so that when the first magnetic force provider 21 rotates, it can generate a force facing the second magnetic force provider 61 and drive the driven member 6 to rotate. The surfaces of the first magnetic force provider 21 and the second magnetic force provider 61 can extend along the axial direction X or along the radial direction Y. By arranging the sensing element 41 and the second magnetic force provider 61 in a manner that at least partially overlaps along the coupling direction, the sensing element 41 can detect the rotational speed of the second magnetic force provider 61 without changing the coupling transmission relationship, arrangement position, and transmission effect between the first magnetic force provider 21 and the second magnetic force provider 61.

[0094] In an exemplary embodiment, the sensing element 41 and the first magnetic force provider 21 can be coaxial or non-coaxial in the extending direction of the first magnetic force provider 21. When coaxial, the corresponding axes of the sensing element 41 and the first magnetic force provider 21 coincide. When non-coaxial, the axes of the two do not coincide when the first magnetic force provider is rotated to any position. For example, when the first magnetic force provider 21 extends in the axial direction X, its axis in the axial direction X is the same as the axis of the sensing element 41 in the axial direction X. As another example, when the sensing element 41 and the first magnetic force provider 21 extend in the radial direction Y, the axis of the first magnetic force provider 21 in the radial direction Y is the same as the axis of the sensing element 41 in the radial direction Y.

[0095] The coupling direction mentioned above can refer to the radial direction Y or the axial direction X. In the exemplary embodiment, when the coupling direction is the radial direction Y, such as... Figure 1 In the Y direction shown, the first magnetic force provider 21 and the second magnetic force provider 61 are coupled to each other in the radial direction Y. The first part d1 of the second magnetic force provider 61 faces the first magnetic force provider 21 directly in the radial direction Y, and the second part d2 of the second magnetic force provider 61 faces the sensing element 41 in the speed detection element 4 directly in the radial direction Y. At this time, the first part d1 of the second magnetic force provider 61 is coupled to the first magnetic force provider 21. When the driving member 2 rotates, the coupled part of the first magnetic force provider 21 and the second magnetic force provider 61 generates a pushing force / pulling force that drives the driven member 6 to rotate. The second part d2 of the second magnetic force provider 61 corresponds to the position of the sensing element 41, so that the sensing element 41 can accurately sense the magnetic field change generated by the second magnetic force provider 61.

[0096] In an exemplary embodiment, when the coupling direction is radial direction Y, the first magnetic force provider 21 at least partially overlaps with the second magnetic force provider 61 in the radial direction Y, correspondingly, as... Figure 1 As shown, the first magnetic force provider 21 has a second overlapping portion d3 that overlaps with the second magnetic force provider 61 in the radial direction Y. The axial length of the second overlapping portion d3 is less than the axial length of the second magnetic force provider 61. The second portion d2 is located in the part of the second magnetic force provider 61 that does not overlap with the first magnetic force provider 21 in the radial direction Y. In the radial direction Y, the second overlapping portion d3 overlaps with and couples with the first portion d1 of the second magnetic force provider 61. When the first magnetic force provider 21 rotates, the force generated by the change in the magnetic field of the second overlapping portion d3 can act on the first portion d1 of the second magnetic force provider 61, thereby driving the second magnetic force provider 61 to rotate.

[0097] In an exemplary embodiment, when the coupling direction is radial direction Y, in order for the sensing element 41 to accurately detect the rotational speed of the second magnetic force provider 61, it is necessary to ensure that a portion of the sensing element 41 overlaps with the second magnetic force provider 61 in the radial direction Y, and that this overlapping area is not obstructed by the first magnetic force provider 21. Specifically, see... Figure 1 At least a portion of the sensing element 41 in the rotational speed detection element 4 overlaps with the second magnetic force provider 61 in the radial direction Y. This overlapping portion can detect the change in the magnetic field generated by the second magnetic force provider 61. The first magnetic force provider 21 does not overlap with the sensing element 41 in the radial direction Y to prevent the first magnetic force provider 21 from affecting the sensing element 41's detection of the change in the magnetic field of the second magnetic force provider 61. This allows the sensing element 41 to effectively sense the change in the magnetic field generated by the second magnetic force provider 61 and not mistake the magnetic field generated by the first magnetic force provider 21 for the magnetic field generated by the second magnetic force provider 61, thereby accurately calculating the rotational speed of the second magnetic force provider 61.

[0098] The sensing element 41 can be disposed on the proximal side of the first magnetic force providing member 21 or on the distal side of the first magnetic force providing member 21, for example, see [reference needed]. Figure 1 The sensing element 41 and Figure 13 The rotational speed detection element in the middle is 4g. Figure 14 The positions of the speed detection elements 4i and 4j are shown in the diagram. The speed sensing element 41 in the speed detection element 4 is located at the distal end of the first magnetic force provider 21. In this case, the proximal end of the sensing element 41 in the speed detection element 4 is located far from the distal end of the first magnetic force provider 21, meaning the distance between the proximal end of the sensing element 41 and the motor is greater than the distance between the distal end of the first magnetic force provider 21 and the motor. For example... Figure 9 The sensing element 41 in the middle Figure 13 The rotational speed detection element in the middle 4h, Figure 14 As shown in the diagram, the positions of the speed detection elements 4k, 4m, and 4n are such that the sensing element 41 in the speed detection element 4 is located near the proximal end of the first magnetic force provider 21. At this time, the distal end of the sensing element 41 in the speed detection element 4 is located near the proximal end of the first magnetic force provider 21, meaning the distance between the distal end of the sensing element 41 and the motor 1 is less than the distance between the proximal end of the first magnetic force provider 21 and the motor 1. In other words, the projection of the sensing element 41 in the axial direction X is located on one side of the projection of the first magnetic force provider 21 in the axial direction X, and there is no overlap between the two projections. Thus, by placing the sensing element 41 on both sides of the first magnetic force provider 21, interference from the first magnetic force provider 21 with the magnetic field of the second magnetic force provider 61 sensed by the sensing element 41 can be prevented, making the sensing result of the sensing element 41 more accurate, thereby more accurately detecting the speed of the driven component.

[0099] In an exemplary embodiment, when the coupling direction is the axial direction X, and the first magnetic force provider 21 and the second magnetic force provider 61 are coupled along the axial direction X, see [reference needed]. Figure 10 The planes of the first magnetic force provider 21 and the second magnetic force provider 61 extend in the radial direction Y. At this time, the first magnetic force provider 21 and the second magnetic force provider 61 are magnetically coupled in the axial direction X. The first magnetic force provider 21 has a third overlapping portion d4 that overlaps with the second magnetic force provider 61 in the axial direction X. The radial width (dimension in the radial direction Y) of the third overlapping portion d4 is smaller than the radial width of the second magnetic force provider 61. The second portion d2 is located in the part of the second magnetic force provider 61 that does not overlap with the first magnetic force provider 21 in the axial direction X. At this time, the change in the magnetic field provided by the second portion d2 when the second magnetic force provider 61 rotates can be effectively detected by the sensing element 41.

[0100] In an exemplary embodiment, when the coupling direction is the axial direction X, such as Figure 10 As shown, the first magnetic force provider 21 and the second magnetic force provider 61 are coupled to each other in the axial direction X. The first part d1 of the second magnetic force provider 61 faces the first magnetic force provider 21 in the axial direction X, and the second part d2 of the second magnetic force provider 61 faces the sensing element 41 in the speed detection element 4 in the axial direction X. At this time, the first part d1 of the second magnetic force provider 61 is coupled to the first magnetic force provider 21. When the driving member 2 rotates, the coupled part of the first magnetic force provider 21 and the second magnetic force provider 61 generates a pushing force / pulling force that drives the driven member 6 to rotate. The second part d2 of the second magnetic force provider 61 overlaps with the sensing element 41 in the axial direction X, so that the sensing element 41 can accurately sense the magnetic field changes generated by the second magnetic force provider 61. Figure 10 In the example, the second part d2 of the second magnetic force provider 61 is located on the outer periphery of the first part d1. When the second magnetic force provider 61 rotates, the second part d2 periodically faces the sensing element 41 in the rotation speed detection element 4 and coincides with the sensing element 41 in the axial direction X. The second part d2 of the second magnetic force provider 61 may have only one magnet or multiple magnets spaced apart along the outer periphery of the first part d1.

[0101] In an exemplary embodiment, when the coupling direction is the axial direction X, in order for the sensing element 41 to detect the rotational speed of the second magnetic force provider 61, it is necessary to ensure that a portion of the sensing element 41 overlaps with the second magnetic force provider 61 in the axial direction, and that the sensing element 41 is not obstructed by the first magnetic force provider 21. Specifically, see... Figure 10 and Figure 12At least a portion of the sensing element 41 in the speed detection element 4 overlaps with the second magnetic force provider 61 in the axial direction X. The change in the magnetic field generated by the second magnetic force provider 61 is sensed through the overlapping portion. The first magnetic force provider 21 does not overlap with the sensing element 41 in the speed detection element 4 in the axial direction X, so as to prevent the first magnetic force provider 21 from shielding or interfering with the magnetic field generated by the second magnetic force provider 61 that the sensing element 41 needs to detect, or from mistaking the magnetic field generated by the first magnetic force provider 21 as the magnetic field generated by the second magnetic force provider 61, thereby affecting the accuracy of speed calculation.

[0102] In an exemplary embodiment, when the coupling direction is the axial direction X, the edge of the sensing element 41 near the axis can be located outside the edge of the first magnetic force provider 21 away from the axis. Here, "outer side" refers to the side of the edge of the first magnetic force provider 21 away from the axis that faces away from the axis. Alternatively, the edge of the sensing element 41 away from the axis can be located inside the edge of the first magnetic force provider 21 near the axis. Here, "inner side" refers to the side of the edge of the first magnetic force provider 21 near the axis that faces the axis. This arrangement can prevent the first magnetic force provider 21 from shielding or interfering with the magnetic field of the second magnetic force provider 61 that the sensing element 41 needs to detect. Thus, by offsetting the sensing element 41 and the first magnetic force provider 21 in the radial direction Y, there is no overlap between them. In this case, the change in the magnetic field generated by the first magnetic force provider 21 will not be sensed by the first magnetic force provider 21, which can prevent the first magnetic force provider 21 from interfering with the magnetic field of the second magnetic force provider 61 sensed by the sensing element 41, so that the sensing result of the sensing element 41 is more accurate.

[0103] In order for the rotational speed detection element 4 to accurately detect the rotational speed of the second magnetic force provider 61, in an exemplary embodiment, the rotational speed detection element 4 needs to be installed in a gap within the drive assembly 100 that can sense the magnetic field of the second magnetic force provider 61. In an exemplary embodiment, the rotational speed detection element 4 can be installed in a gap on one side of the first joint 3. This gap can refer to the gap between the first joint member 3 and the driving member 2, or it can refer to the gap between the first joint member 3 and the second joint member 5. The rotational speed detection element 4 is located in this gap and is fitted to the wall surface of the first joint member 3. By placing the rotational speed detection element 4 in the gap, reliable measurement of the actual rotational speed of the driven member in the interventional working assembly can be achieved within a limited slit space.

[0104] In an exemplary embodiment, the first engaging member 3 and the second engaging member 5 can be interlocked to form a sleeve structure. One of the first engaging member 3 and the second engaging member 5 is configured as an outer sleeve, and the other is configured as an inner sleeve. The inner sleeve and the outer sleeve are interlocked to magnetically couple the driving member 2 and the driven member 6. When the inner sleeve and the outer sleeve are interlocked, their positions are relatively fixed, and a gap is left between the inner sleeve and the outer sleeve. The speed detection element 4 can be located in this gap. The first magnetic force providing member 21 and the second magnetic force providing member 61 located in the sleeve structure are coupled to each other, and the sensing element 41 can effectively sense the magnetic field of the second magnetic force providing member 61.

[0105] In an exemplary embodiment, see Figure 1 The first engaging component 3 is configured as a first outer sleeve, and the second engaging component 5 is configured as a first inner sleeve. A first gap H1 exists between the inner wall of the first outer sleeve and the outer wall of the first inner sleeve. The rotational speed detection element 4 is located within the first gap H1 and is connected to the inner wall of the first outer sleeve, so that the rotational speed detection element 4 is reliably fixed to the inner wall of the first outer sleeve. It should be noted that the rotational speed detection element 4 can be directly fixed to the inner wall of the first outer sleeve, or it can be indirectly fixed to the inner wall of the first outer sleeve; both can be understood as the rotational speed detection element 4 being connected to the inner wall of the first outer sleeve. In this case, the rotational speed detection element 4, being fixed to the first outer sleeve, will not rotate with the driving component 2. Similarly, the driving component 2, and the first magnetic force providing component 21 on the driving component 2, are also located within the gap between the first inner sleeve and the first outer sleeve. The driven component 6, and the second magnetic force providing component 61 located on the driven component 6, are located inside the first inner sleeve. The technical solution provided in this application embodiment fixes a flexible, thin-film speed detection element to the inner wall of the first outer sleeve located at the first gap H1. This can effectively detect the speed of the driven component without changing the transmission relationship and structure between the driving component 2 and the driven component 6, thus effectively reducing R&D costs and product costs.

[0106] In an exemplary embodiment, the shapes of the outer sleeve and inner sleeve can be selected according to design requirements, for example, see... Figure 11 When the first joining component 3 is configured as the first outer sleeve and the second joining component 5 is configured as the first inner sleeve, the inner wall of the first outer sleeve can be circular in a sectional plane perpendicular to the axial direction X, and the outer surface of the first inner sleeve can also be circular in a sectional plane perpendicular to the axial direction X. In this case, the inner wall of the first outer sleeve includes a first inner circumferential surface, and the outer wall of the first inner sleeve includes a first outer circumferential surface. A certain distance exists between the first inner circumferential surface and the first outer circumferential surface. Figure 1 , Figure 11 as well as Figure 12The first annular gap H11 is shown. The first gap H1 includes the first annular gap H11. At this time, the speed detection element 4 is in the shape of a flexible sheet, which can be bent to adapt to the curved shape. At least a part of the speed detection element 4 is located in the first annular gap H11, and the speed detection element 4 is connected to at least a part of the curved surface of the first inner circumferential surface in the bent state, so as to fix the speed detection element 4 on the first inner circumferential surface.

[0107] Optionally, at least a portion of the sensing element 41 overlaps with the second magnetic force provider 61 in the radial direction Y to sense changes in the magnetic field generated when the second magnetic force provider 61 rotates. The second magnetic force provider 61 is located on the driven member 6 within the inner sleeve. Figure 1 As shown, when the sensing element 41 and the second magnetic force provider 61 in the detection element 4 extend in the axial direction X, and the second magnetic force provider 61 rotates along the axis of the driven member 6, the sensing element 41 can detect the changing magnetic field generated when the second magnetic force provider 61 rotates. Figure 12 As shown, when the sensing element 41 in the detection element 4d extends along the axial direction X and the second magnetic force provider 61 extends along the radial direction Y, the rotation of the second magnetic force provider 61 will also generate a changing magnetic field on the sensing element 41 of the detection element 4d. After sensing the change in the magnetic field of the second magnetic force provider 61, the sensing element 41 will generate a corresponding output signal to characterize the rotational speed of the second magnetic force provider 61.

[0108] The technical solution provided in this application embodiment allows for the installation of a flexible, thin-film speed detection element using the existing annular gap between the inner and outer sleeves. The flexible, thin-film speed detection element is fixed in close contact with the inner wall of the first outer sleeve located at the first annular gap H11, which can effectively detect the speed of the driven component. Furthermore, it does not require changes to the transmission relationship and structure between the driving component 2 and the driven component 6, effectively reducing research and development costs and product costs.

[0109] In an exemplary embodiment, when the first engaging member 3 is configured as a first outer sleeve and the second engaging member 5 is configured as a first inner sleeve, see [reference needed]. Figure 1The drive assembly also includes a washer 7, which is disposed within an inner cavity defined by a first inner circumferential surface. The washer 7 is located at the distal end of the inner cavity and connected to the first inner circumferential surface. The rotational speed detection element 4 is at least partially connected to the inner circumferential surface of the washer 7. The washer 7 protects the driving member 2. At the same time, this arrangement can effectively shorten the length of the driving member 2 in the axial direction X, improve the rotational stability of the driving member 2, and reduce the material cost of the driving member 2. Furthermore, the arrangement of the washer 7 can reduce the length of the first magnetic force providing element 21 on the driving member 2 while maintaining the length of the first outer sleeve. When the first magnetic force providing element 21 is a conductor, reducing the length of the first magnetic force providing element 21 can reduce the induced current on the first magnetic force providing element 21, thereby reducing its heat generation. Maintaining the length of the first outer sleeve at a certain length can ensure the coaxiality of the driving member 2 and the driven member 6 after the inner and outer sleeves are inserted, reducing vibration.

[0110] Further, see Figure 1 At least a portion of the washer 7 overlaps with the driving member 2 in the axial direction X. The washer 7 is located on the distal side of the driving member 2. This arrangement protects the distal end of the driving member 2, preventing it from being directly exposed in the distal opening of the first outer sleeve. Furthermore, the washer 7 has a certain thickness, which also helps to seal the distal opening of the first outer sleeve when the first outer sleeve and the first inner sleeve are inserted, thus sealing the first annular gap H11 within the first outer sleeve and preventing impurities or liquids from entering the first annular gap H11 and contaminating the outer surface of the driving member 2 and the inner surface of the first mating member 3.

[0111] In an exemplary embodiment, such as Figure 12As shown, when the first joining component 3 is configured as the first outer sleeve and the second joining component 5 is configured as the first inner sleeve, the inner wall of the first outer sleeve includes a first inner end face S1, and the outer wall of the first inner sleeve includes a first outer end face S2. End faces S1 and S2 can be planar structures. A first end face gap H12 exists between the first inner end face S1 and the first outer end face S2. The first end face gap H12 refers to the gap formed by the space between the first inner end face S1 and the first outer end face S2, and the first gap includes the first end face gap H12. At least a portion of the speed detection element 4 (such as speed detection element 4e) is located within the first end face gap H12, and the speed detection element 4e is connected to the first inner end face S1 to fix its position. Since the first inner end face is a planar structure, the speed detection element 4e can also be a relatively rigid thin sheet structure, the thickness of which can be configured to be set within the first end face gap H12. Optionally, the speed detection element 4e can be directly pasted onto the first inner end face S1. Optionally, at least a portion of the sensing element 41 overlaps with the second magnetic force provider 61 in the axial direction X to detect changes in the magnetic field generated by the second magnetic force provider 61. Of course, if the first inner sleeve is made of a material that allows magnetic fields to pass through, see [reference needed]. Figure 12 The rotational speed detection element 4 (as shown by rotational speed detection element 4f) can also be disposed on the inner end face of the first inner sleeve, where the inner end face is the side of the first inner sleeve that faces away from the outer end face. In this case, the magnetic field generated when the second magnetic force provider 61 rotates can pass through the end face of the first inner sleeve and act on the rotational speed detection element 4f. Optionally, the first magnetic force provider 21 and the second magnetic force provider 61 are coupled along the axial direction X.

[0112] In an exemplary embodiment, see Figure 1 or Figure 13 When the first connecting component 3 is configured as the first outer sleeve and the second connecting component 5 is configured as the first inner sleeve, the driving component 2 is inserted into the first outer sleeve, and there is a second gap H2 between the inner wall of the first outer sleeve and the outer wall of the driving component 2; the rotational speed detection element 4 is located in the second gap H2 and is connected to the inner wall of the first outer sleeve.

[0113] In an exemplary embodiment, see Figure 13When the first joining component 3 is configured as the first outer sleeve and the second joining component 5 is configured as the first inner sleeve, the inner wall of the first outer sleeve includes the first inner circumferential surface S3, the outer wall of the active component 2 includes the second outer circumferential surface S4, and there is a second annular gap H21 between the first inner circumferential surface S3 and the second outer circumferential surface S4. The second gap H2 includes the second annular gap H21. At this time, the rotational speed detection element 4 (such as the rotational speed detection unit 4h) can be in the form of a flexible sheet structure. At least a portion of the rotational speed detection element 4h is located within the second annular gap H21, and the rotational speed detection element 4h is connected to at least a portion of the curved surface of the first inner circumferential surface S3 in a bent state to fix the rotational speed detection element 4h on the first inner circumferential surface. At least a portion of the sensing element 41 of the rotational speed detection element 4h overlaps with the second magnetic force provider 61 in the radial direction Y or the axial direction X to sense the change in the magnetic field generated by the second magnetic force provider 61. At this time, the first connecting component 3 does not need to reserve a position for installing the speed detection element 4h in the axial direction X or radial direction Y, which can effectively reduce the axial length of the first connecting component 3 and reduce the material cost of the first connecting component 3.

[0114] In an exemplary embodiment, besides using the first joining member 3 as the outer sleeve of the sleeve structure and the second joining member 5 as the inner sleeve of the sleeve structure, see also... Figure 10 or Figure 14 Alternatively, the first engaging member 3 can be used as the inner sleeve of the sleeve structure, and the second engaging member 5 can be used as the outer sleeve of the sleeve structure. The driven member 6 is disposed in the gap between the inner sleeve and the outer sleeve, and the driving member 2 is disposed in the inner sleeve. That is, in the exemplary embodiment, the first engaging member 3 is configured as the second inner sleeve, the second engaging member 5 is configured as the second outer sleeve, and a third gap H3 is formed between the inner wall of the second outer sleeve and the outer wall of the second inner sleeve; the rotational speed detection element 4 ( Figure 10 Rotational speed detection element 4a in the middle Figure 14 The rotational speed detection element 4m is located within the third gap H3 and connected to the outer wall of the second inner sleeve, so that the rotational speed detection elements 4a and 4m are fixed on the outer wall of the second inner sleeve and can directly face the second magnetic force provider 61 to better sense changes in the magnetic field generated by the second magnetic force provider 61. The driven member 6 is disposed within the third gap H3. Figure 10 In the example, the second magnetic force providing member 61 on the follower 6 extends in the radial direction Y and is disposed facing the outer wall of the first engaging member 3. Figure 14 In the example, the second magnetic force provider 61 on the follower 6 extends in the axial direction X and is disposed facing the outer wall of the first engaging member 3.

[0115] In an exemplary embodiment, when the first joining member 3 is configured as a second inner sleeve and the second joining member 5 is configured as a second outer sleeve, the inner surface of the second outer sleeve in a section perpendicular to the axial direction X is circular, and the outer surface of the second inner sleeve in a section perpendicular to the axial direction X is circular. In this case, the inner wall of the second outer sleeve includes a second inner circumferential surface, and the outer wall of the second inner sleeve includes a third outer circumferential surface. A gap exists between the second inner circumferential surface and the third outer circumferential surface. Figure 14 The third annular gap H31 shown, i.e., the third gap H3, includes the... Figure 11 The annular gap H11 is similar to the third annular gap H31; the speed detection element 4 is a flexible, thin sheet that can be bent at will, at least a portion of the speed detection element 4 is located within the third annular gap H31, and the speed detection element 4 (speed detection element 4m) is connected to at least a portion of the curved surface of the third outer circumference in the bent state, so as to fix the speed detection element 4m to the outer wall of the second inner sleeve. Optionally, as Figure 14 As shown, the driving element 2 and the driven element 6 are coupled in the radial direction Y. At least a portion of the sensing element 41 in the rotational speed detection element 4m overlaps with the second magnetic force providing element 61 in the radial direction Y, so that it can better sense the changes in the magnetic field generated by the second magnetic force providing element 61.

[0116] In an exemplary embodiment, see Figure 10 and Figure 14 When the first engaging component 3 is configured as the second inner sleeve and the second engaging component 5 is configured as the second outer sleeve, the outer wall of the second inner sleeve includes the second outer end face S5, the inner wall of the second outer sleeve includes the second inner end face S6, a second end face gap H4 exists between the second inner end face S6 and the second outer end face S5, and a third gap H3 includes the second end face gap H4; the rotational speed detection element 4 ( Figure 10 The rotational speed detection element 4a and Figure 14 At least a portion of the rotational speed detection elements 4i and 4n are located within the second end face gap H4, and the rotational speed detection element 4 is connected to the second outer end face S5 to fix the rotational speed detection element 4 on the second outer end face S5. The first magnetic force providing member 21 is disposed on the outer surface of the end of the driving member 2 facing the second inner end face S6, and the second magnetic force providing member 61 is disposed on the inner surface of the end of the driven member 6 facing the second outer end face S5. The second outer end face S5 can be a planar structure, and in this case, the rotational speed detection element 4 can be a rigid thin sheet structure. When the rotational speed detection element 4 ( Figure 10 The rotational speed detection element 4a and Figure 14 When at least a portion of the rotational speed detection elements 4i and 4n are located within the second end face gap H4, in Figure 10 In the example shown, at least a portion of the sensing element 41 in the rotational speed detection element 4 overlaps with the second magnetic force provider 61 in the axial direction X. Figure 14In the example shown, at least a portion of the sensing element 41 in the rotational speed detection element 4 overlaps with the second magnetic force provider 61 in the axial or radial direction Y.

[0117] In an exemplary embodiment, see Figure 10 and Figure 14 The first engaging component 3 is configured as a second inner sleeve, the second engaging component 5 is configured as a second outer sleeve, the driven component 6 is disposed in the gap between the inner sleeve and the outer sleeve, and the driving component 2 is disposed in the inner sleeve. The first engaging component 3 is configured as a second inner sleeve, the second engaging component 5 is configured as a second outer sleeve, and the driving component 2 passes through the second inner sleeve. A fourth gap H5 exists between the inner wall of the second inner sleeve and the outer wall of the driving component 2. Optionally, the end face of the second inner sleeve is made of a material that allows magnetic fields to pass through, and the rotational speed detection element 4 ( Figure 10 The rotational speed detection elements 4b and 4c in the middle and Figure 14 The speed detection elements 4j and 4k are located within the fourth gap H5 and connected to the inner wall of the second inner sleeve, so as to connect the speed detection elements 4j and 4k. Figure 10 The rotational speed detection elements 4b and 4c in the middle and Figure 14 The rotational speed detection elements 4j and 4k are fixed on the second inner sleeve. At this time, the sensing element 41 in the rotational speed detection element 4 can sense the magnetic field change of the second magnetic force providing element 61 through the end face of the second inner sleeve.

[0118] Optionally, the inner surface of the first engaging member 3 in the axial direction X is circular, and the outer surface of the active member 2 in the cross-section in the axial direction X is circular. See [reference needed]. Figure 10 and Figure 14 The inner wall of the second inner sleeve includes a third inner circumferential surface S7, and the outer wall of the driving member 2 includes a fourth outer circumferential surface S8. A fourth annular gap H51 exists between the third inner circumferential surface S7 and the fourth outer circumferential surface S8. The fourth gap H5 includes the fourth annular gap H51; the rotational speed detection element 4 ( Figure 10 The rotational speed detection element 4c and Figure 14 The speed detection elements 4j and 4k in the middle are in the shape of flexible thin sheets, and the speed detection element 4 ( Figure 10 The rotational speed detection element 4c and Figure 14 At least a portion of the speed detection elements 4j and 4k are located within the fourth annular gap H51, and the speed detection element 4j ( Figure 10 The rotational speed detection element 4c and Figure 14The rotational speed detection elements 4j and 4k are connected to at least a portion of the curved surface of the third inner circumferential surface S7 in a bent state; at least a portion of the sensing element 41 overlaps with the second magnetic force provider 61 in the radial direction Y; the first magnetic force provider 21 can be disposed inside or outside the active member 2; when the material of the active member 2 is a material that can be penetrated by magnetic force, the second magnetic force provider 61 can be disposed inside the driven member 6.

[0119] In an exemplary embodiment, when the first engaging member 3 is configured as a second inner sleeve and the second engaging member 5 is configured as a second outer sleeve, see [reference needed]. Figure 10 The inner wall of the second inner sleeve includes a third inner end face S10, the outer wall of the driving member 2 includes a third outer end face S9, a third end face gap H6 is provided between the third inner end face S10 and the third outer end face S9, and a fourth gap H5 includes the third end face gap H6; the speed detection element 4 (speed detection element 4c) can be a hard sheet structure, at least a part of the speed detection element 4c is located in the third end face gap H6, and the speed detection element 4c is connected to the third inner end face S10; at least a part of the sensing element 41 in the speed detection element 4c overlaps with the second magnetic force providing member 61 in the axial direction X, the first magnetic force providing member 21 can be provided on the third outer end face S9 of the driving member 2, or on the inner wall of the driving member 2 opposite to the third outer end face S9, and the second magnetic force providing member 61 can be provided on the inner wall of the driven member 6 facing the outer end face of the driving member 2.

[0120] Or, see Figure 10 The driven member 6 passes through the second outer sleeve and has a fourth outer end face. A fourth end face gap H7 exists between the fourth outer end face and the outer end face of the second inner sleeve. At least a portion of the speed detection element 4 (speed detection element 4a) is located within the fourth end face gap H7, and the speed detection element 4a is connected to the outer end face of the second inner sleeve. Optionally, at least a portion of the sensing element 41 in the speed detection element 4a overlaps with the second magnetic force providing member in the axial direction X.

[0121] In an exemplary embodiment, the types of the first magnetic force provider 21 and the second magnetic force provider 61 can be selected according to design requirements. For example, the first magnetic force provider 21 can be a conductor (such as a metal conductor) or a magnet, and the second magnetic force provider 61 can be a magnet. When the first magnetic force provider 21 and the second magnetic force provider 61 are magnets, when the first magnetic force provider 21 rotates, the magnetic field generated by the first magnetic force provider 21 couples with the magnetic field generated by the second magnetic force provider 61 to generate a force that pushes / pulls the driven member 6 to rotate. When the first magnetic force provider 21 is a conductor and the second magnetic force provider 61 is a magnet, when the first magnetic force provider 21 rotates, it cuts the magnetic field generated by the second magnetic force provider 61, generating an induced electromotive force current and an induced magnetic field. The induced magnetic field couples with the magnetic field generated by the second magnetic force provider 61 to generate a force that pushes / pulls the driven member 6 to rotate.

[0122] See Figure 1 When motor 1 rotates, its output shaft drives the driving member 2 to rotate. The first magnetic force provider 21 and the second magnetic force provider 61 on the driving member 2 mutually induce each other to generate a magnetic force to drive the driven member 6 to rotate. When the driven member 6 rotates, the second magnetic force provider 61 rotates accordingly, causing a change in the magnetic field generated by the second magnetic force provider 61. When the sensing element 41 in the speed detection element 4 detects this change in magnetic field, it generates a speed signal to characterize the speed of the driven member 6. In order to make the magnetic field of the first magnetic force provider 21 act better on the second magnetic force provider 61, the magnetic field of the second magnetic force provider 61 act better on the first magnetic force provider 21 (when the first magnetic force provider 21 is a conductor), and the magnetic field of the second magnetic force provider 61 be better sensed by the speed sensing element 41, the first connecting member 3 and the second connecting member can be made of non-ferromagnetic materials, such as aluminum, engineering plastics, glass, ceramics, etc. Due to their low permeability or special magnetization characteristics, these materials cannot effectively block or guide the magnetic field, allowing the magnetic field to easily penetrate and be sensed by the other party.

[0123] The rotational speed detection element 4 includes a flexible substrate, and the sensing element 41 includes a coil disposed within the flexible substrate. The flexible substrate is connected to the various positions disclosed in the above embodiments, and the sensing element 41 senses changes in the magnetic field generated by the second magnetic force providing member 61. In an exemplary embodiment, see [link to example]. Figure 15The sensing element 41 and the signal processing circuit can convert the sensing result of the sensing element 41 into a speed signal characterizing the rotational speed of the driven member 6. The signal processing circuit may include a low-pass filter circuit 42, a signal amplification circuit 43, a comparator circuit 44, and a processor 45. The output terminal of the sensing element 41 is connected to the input terminal of the low-pass filter circuit 42. The output terminal of the low-pass filter circuit 42 is connected to the input terminal of the comparator circuit 44 through the signal amplification circuit 43. The output terminal of the comparator circuit 44 is connected to the input terminal of the processor 45. The first control signal output interface of the processor 45 is connected to the gain signal control terminal of the amplification circuit 43; the second control signal output interface of the processor 45 is connected to the reference signal input terminal of the comparator circuit 44. The sensing element 41, the low-pass filter circuit 42, the signal amplification circuit 43, the comparator circuit 44, and the processor 45 cooperate to realize the speed measurement of the driven member 6. The low-pass filter circuit 42 is used to perform low-pass filtering on the sensing signal output by the sensing element 41 to filter out interference signals in the signal. The signal amplification circuit 43 is used to amplify the filtered signal. The comparison circuit 44 is used to compare the output signal of the amplification circuit with a preset threshold and output a pulse signal to the processor 45. The processor 45 is used to generate a signal based on the pulse signal to characterize the rotational speed of the driven member 6.

[0124] In an exemplary embodiment, the speed detection element 4 can independently measure the speed of the driven member 6, or it can be combined with other circuits to measure the speed of the driven member 6. When the speed detection element 4 independently measures the speed of the driven member 6, Figure 15 The low-pass filter circuit 42, signal amplification circuit 43, comparison circuit 44 and processor 45 shown are integrated together with the sensing element 41 in the speed detection element 4. When the speed detection element 4 is combined with other circuits to realize the speed measurement of the driven member 6, the low-pass filter circuit 42, signal amplification circuit 43, comparison circuit 44 and processor 45 can be set in other parts. The low-pass filter circuit 42 is electrically connected to the sensing element 41.

[0125] See Figure 16 In this embodiment, the processor can measure the rotational speed of the driven member 6 through the following steps:

[0126] Step S101: Obtain the preset speed of the motor;

[0127] Step S102: Determine the first gain based on the preset rotational speed;

[0128] Step S103: Obtain the pulse value detected by the comparator circuit at the first gain, and record it as the first pulse value;

[0129] Step S104: Determine the second gain based on the first gain;

[0130] Step S105: Obtain the pulse value detected by the comparator circuit at the second gain, and record it as the second pulse value;

[0131] Step S106: Calculate the difference between the first pulse value and the second pulse value;

[0132] Step S107: Determine whether the difference matches the preset speed;

[0133] If they do not match, the second pulse value read is used as the first pulse value, the second gain is used as the first gain, and the steps to determine the second gain based on the first gain are repeated, as well as subsequent steps, until the difference matches the preset speed.

[0134] Step S108: If a match is found, the gain of the control amplifier circuit is maintained at the second gain, and the rotational speed of the slave is calculated based on the number of magnetic poles of the slave and the number of pulses detected by the amplifier circuit at the second gain.

[0135] See Figure 17 In this embodiment, the processor can measure the rotational speed of the driven member 6 through the following steps:

[0136] Step S201: Obtain the preset speed of the motor;

[0137] Step S202: Determine the first gain based on the preset rotational speed;

[0138] Step S203: Obtain the pulse value detected by the comparator circuit at the first gain, and record it as the first pulse value;

[0139] Step S204: Determine N cyclic gains distributed from small to large based on the first gain, where N is a positive integer not less than 2, and the minimum gain among the N cyclic gains is greater than the first gain;

[0140] Step S205: Obtain the N cyclic pulse values ​​identified when the gain signal of the amplifier circuit is the cyclic gain;

[0141] Step S206: Identify the optimal pulse value from the first pulse value and the N cyclic pulse values;

[0142] This step may specifically include: sorting the pulse values ​​based on the gain values ​​corresponding to the first pulse value and the N cyclic pulse values; taking the median value of the M consecutive largest pulse values ​​among the sorted N+1 pulse values ​​as the optimal pulse value, where M is less than N.

[0143] Step S207: Take the gain corresponding to the optimal pulse value as the target gain, and use the target gain as the gain of the amplifier circuit;

[0144] Step S208: Calculate the rotational speed of the driven component based on the pulse value detected by the amplifier circuit at the target gain and the number of magnetic poles of the driven component.

[0145] Based on the above embodiments, this application provides a preferred structure for a driving component, see [link to previous document]. Figure 1 The drive assembly provided in this application includes a motor 1, with the end face or housing of the motor 1 fixedly connected to a first engaging component 3. Specifically, the first engaging component 3 is an outer rotor housing, and the driving component 2 is specifically an outer rotor. The engaging portion of the driving component 2 is connected to the output shaft of the motor 1, allowing the motor 1 to drive the driving component 2 to rotate. A bearing 01 is provided inside the outer rotor housing to support the driving component 2, fixing the position of the outer rotor within the outer rotor housing and maintaining a preset gap between the outer wall of the outer rotor and the inner wall of the outer rotor housing. A speed detection element 4 is mounted at the distal end of the outer rotor housing via a washer, and a first magnetic force provider 21 is located at the distal end of the driving component 2. A second engaging component 5 is inserted into the recess of the first engaging component 3. A second magnetic force provider 61 is provided inside the driven component 6, allowing the driven component 6 to rotate freely within the second engaging component 5. Specifically, the driven component 6 can be an inner rotor adapted to the outer rotor, and the second engaging component 5 is an inner rotor housing. In the radial direction Y, the first magnetic force provider 21 and the sensing element 41 in the rotation speed detection element 4 at least partially overlap with the second magnetic force provider 61.

[0146] For ease of description, the above system is described by dividing it into various modules based on their functions. Of course, in implementing this invention, the functions of each module can be implemented in one or more software and / or hardware components.

[0147] The various embodiments in this specification are described in parallel or progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on its differences from other embodiments. In particular, for system or system embodiments, since they are fundamentally similar to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. Units described as separate components may or may not be physically separate. Components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0148] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0149] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0150] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0151] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A drive assembly for an interventional working assembly, characterized by The driving assembly is detachably connected with the interventional working assembly; the driving assembly comprises: a motor; a driving element driven by the motor, the driving element having a first magnetic force provider for coupling with a second magnetic force provider in the interventional working assembly to magnetically drive a driven element in the interventional working assembly to rotate; a first engaging component for connecting with a second engaging component in the interventional working assembly; a rotation speed detecting element having an inductive element for coupling with the second magnetic force provider to detect the rotation speed of the driven element; the rotation speed detecting element is in the form of a sheet, and the rotation speed detecting element is connected with a wall surface of the first engaging component.

2. The drive assembly of an interventional working assembly according to claim 1, characterized in that At least a portion of the inductive element overlaps the second magnetic force provider in at least one direction.

3. The drive assembly of an interventional working assembly according to claim 2, characterized in that The first magnetic force provider does not overlap the inductive element in the at least one direction.

4. The drive assembly of an interventional working assembly according to claim 2, characterized in that, The inductive element has a first overlapping portion overlapping the second magnetic force provider in the at least one direction, the first overlapping portion is oppositely arranged with the second magnetic force provider and defines an inductive space, and the first magnetic force provider is located outside the inductive space.

5. The drive assembly of an interventional working assembly according to claim 2, characterized by The at least one direction includes a coupling direction between the first magnetic force provider and the second magnetic force provider, the second magnetic force provider includes a first portion and a second portion, the first portion overlaps the first magnetic force provider in the coupling direction, and the second portion overlaps the inductive element in the coupling direction.

6. The drive assembly of an interventional working assembly according to claim 5, characterized by The first magnetic force provider has a second overlapping portion overlapping the second magnetic force provider in a radial direction, and an axial length of the second overlapping portion is smaller than an axial length of the second magnetic force provider. The second portion is located at a portion of the second magnetic force provider not overlapping the first magnetic force provider in the radial direction.

7. The drive assembly of an interventional working assembly according to claim 5, characterized by The first magnetic force provider has a third overlapping portion overlapping the second magnetic force provider in an axial direction, and a radial width of the third overlapping portion is smaller than a radial width of the second magnetic force provider. The second portion is located at a portion of the second magnetic force provider not overlapping the first magnetic force provider in the axial direction.

8. The driving assembly of the interventional working assembly according to claim 2, wherein At least a portion of the inductive element overlaps the second magnetic force provider in a radial direction, and the first magnetic force provider does not overlap the inductive element in the radial direction.

9. The drive assembly of an interventional working assembly according to claim 8, characterized by A proximal end of the inductive element is located distally of a distal end of the first magnetic force provider, or a distal end of the inductive element is located proximally of a proximal end of the first magnetic force provider.

10. The drive assembly of an interventional working assembly according to claim 2, characterized by At least a portion of the inductive element overlaps the second magnetic force provider in an axial direction, and the first magnetic force provider does not overlap the inductive element in the axial direction.

11. The drive assembly of an interventional working assembly according to claim 10, characterized by An edge portion of the inductive element close to an axis is located outside an edge portion of the first magnetic force provider away from the axis, or an edge portion of the inductive element away from the axis is located inside an edge portion of the first magnetic force provider close to the axis.

12. An interventional medical device apparatus, comprising: The drive assembly and the interventional working assembly according to any one of claims 1-11.

13. The interventional medical device apparatus of claim 12, wherein, The interventional working assembly further comprises: a catheter; a flexible shaft and a rotating member arranged at a distal end of the flexible shaft, a proximal end of the flexible shaft being fixedly connected with the driven member, the flexible shaft being rotatably arranged in the catheter; in use, the rotating member is located in a body, and the drive assembly drives the rotating member to rotate outside the body.

14. The interventional medical device apparatus of claim 13, wherein, The driven member is arranged in a rotor chamber in the second joint component, the driven member has a hollow cavity; the interventional working assembly further comprises a flushing liquid infusion channel and a flushing liquid return channel, wherein the flushing liquid infusion channel is in fluid communication with the catheter and the hollow cavity respectively, the hollow cavity is also in fluid communication with the rotor chamber, and the flushing liquid return channel is in fluid communication with the rotor chamber; in use, after flushing liquid enters the interventional working assembly through the flushing liquid infusion channel, part of the flushing liquid flows into the catheter and flows to a distal end of the catheter, and the other part of the flushing liquid enters the rotor chamber through the hollow cavity to cool the driven member, and then flows out of the interventional working assembly from the flushing liquid return channel.

15. The interventional medical device apparatus of any of claims 12 to 14, wherein, The interventional medical device is a percutaneous ventricular assist device, and the interventional working assembly is an interventional blood pump.

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