CN213158958U

CN213158958U - Shaftless blood pump

Info

Publication number: CN213158958U
Application number: CN202021093241.2U
Authority: CN
Inventors: 刘志敏; 王杉羽; 王强; 彭博
Original assignee: Fuwai Hospital of CAMS and PUMC
Current assignee: Fuwai Hospital of CAMS and PUMC
Priority date: 2020-06-14
Filing date: 2020-06-14
Publication date: 2021-05-11
Anticipated expiration: 2030-06-14

Abstract

The utility model relates to the field of medical equipment, in particular to a shaftless blood pump, which comprises a blood flow pipeline, a rotor arranged in the blood flow pipeline and a drainage cylinder coaxially fixed in the blood flow pipeline, wherein the rotor comprises a rotor cylinder coaxially arranged with the blood flow pipeline and rotor blades fixed on the inner wall of the rotor cylinder; the two ends of the drainage cylinder are open, and the interior of the drainage cylinder is hollow; the hollow part of the drainage cylinder is coaxially provided with a drainage channel and a pump spray channel, the drainage channel is in a circular truncated cone shape, the diameter of the drainage channel is gradually reduced along the blood flow direction, the pump spray channel is in butt joint with the tail end of the drainage channel, and the rotor cylinder is arranged on the cylinder wall of the drainage cylinder at the position of the pump spray channel and is coaxially arranged with the pump spray channel. The utility model discloses can effectively reduce the spare part quantity of blood pump, improve blood pump compact structure degree, reduce the disorderly possibility of blood flow, be favorable to reducing the blood flow power loss simultaneously, promote pumping efficiency.

Description

Shaftless blood pump

Technical Field

The utility model relates to the field of medical equipment, especially, relate to a shaftless blood pump.

Background

The blood pump is mainly used for extracorporeal auxiliary circulation and heart failure assistance, is a key technology for replacing the beating and blood circulation of the heart of a human body, and has important significance for the treatment and development of critical emergency treatment and cardiovascular diseases. The blood pump generally adopts a high-speed rotary rotor (centrifugal or axial flow type) to drive blood to flow in a single direction, but the rotor and a driving motor need to be connected with a transmission shaft, so that a blood circulation loop cannot be completely sealed, blood pollution is easily caused, and the damage to blood cells is increased by a high-shear stress area formed by a tiny gap between the rotor and a pump body. At present, the blood pump without the shaft type structure is gradually applied to clinic.

Chinese patent CN 110833638A discloses a blood pump without shaft type structure, which includes a sleeve, a rotor disposed in the sleeve and a driving device disposed outside the sleeve and used for driving the rotor to rotate, the rotor includes a rotor cylinder disposed coaxially with the sleeve and rotor blades fixed on the inner wall of the rotor cylinder, a hollow blood flow channel is formed in the middle of the rotor, a drainage channel is disposed at the rear side of the rotor in the sleeve, the drainage channel narrows gradually along the blood flow direction and is used for draining the peripheral blood flow to the middle blood flow, the blood flowing out from the drainage channel can recover to a normal laminar flow state, and the possibility of blood component damage and thrombus generation in the subsequent flowing process is effectively reduced.

However, the bigger drawback of the above blood pump lies in that, because the drainage channel is arranged at the rear side of the rotor, and the drainage channel is formed by the circular truncated cone-shaped drainage tube inner cavity independent of the rotor, the number of parts of the blood pump is increased, the compactness of the blood pump is reduced, the possibility of blood flow disorder is improved, and partial power is also lost when the blood pumped out from the rotor drains through the drainage tube, thereby reducing the pumping efficiency.

Therefore, in order to solve the above technical problems, a shaftless blood pump is needed, which effectively reduces the number of parts of the blood pump, improves the compactness of the blood pump, reduces the possibility of blood flow disorder, and is beneficial to reducing the blood flow power loss and improving the pumping efficiency.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a shaftless blood pump effectively reduces the spare part quantity of blood pump, improves blood pump compact structure degree, reduces the disorderly possibility of blood flow, is favorable to reducing the blood flow power loss simultaneously, promotes pumping efficiency.

In order to achieve the above object, the present invention provides a shaftless blood pump, which comprises a blood flow pipeline, a rotor arranged in the blood flow pipeline, and a drainage tube coaxially fixed in the blood flow pipeline, wherein the rotor comprises a rotor cylinder coaxially arranged with the blood flow pipeline and rotor blades fixed on the inner wall of the rotor cylinder; the two ends of the drainage cylinder are open, and the interior of the drainage cylinder is hollow;

the hollow part of the drainage cylinder is coaxially provided with a drainage channel and a pump spray channel, the drainage channel is in a circular truncated cone shape, the diameter of the drainage channel is gradually reduced along the blood flow direction, the pump spray channel is in butt joint with the tail end of the drainage channel, and the rotor cylinder is arranged on the cylinder wall of the drainage cylinder at the position of the pump spray channel and is coaxially arranged with the pump spray channel.

As the utility model discloses technical scheme's further improvement, the outer wall of rotor drum has inlayed the permanent magnet, still install in the section of thick bamboo wall of drainage section of thick bamboo and be used for driving the rotatory electromagnetic drive coil of rotor drum, electromagnetic drive coil passes through the wire connection and is located the outer controller of blood flow pipeline, the electric current size and the direction in the controller control electromagnetic drive coil are in order to produce with permanent magnet complex alternating magnetic field in order to drive the rotor drum rotatory.

As a further improvement of the technical scheme of the utility model, the inner wall of the drainage cylinder is provided with a rotor mounting groove and bearing mounting grooves which are positioned at two ends of the rotor mounting groove and communicated with the rotor mounting groove, the rotor cylinder is mounted in the rotor mounting groove through a rotating bearing arranged in the bearing mounting groove, and the inner wall of the rotor cylinder is level with the inner wall of the drainage cylinder after mounting;

the wall of the drainage tube is also provided with a coil mounting groove and a wire passing hole communicated with the coil mounting groove, the electromagnetic driving coil is fixed in the coil mounting groove, and the conducting wire penetrates through the wire passing hole and is connected with the electromagnetic driving coil.

As the technical scheme of the utility model further improve, rotor blade is spiral blade formula structure, just form spiral blood runner between rotor blade's the lateral wall and the inner wall of rotor drum.

As a further improvement of the technical scheme of the utility model, install fixed blade on the section of thick bamboo wall that the drainage tube is in the drainage channel position, fixed blade is the helical blade formula structure, just form spiral blood runner between fixed blade's the lateral wall and the inner wall of drainage tube.

As a further improvement of the technical scheme of the utility model, monitoring holes are arranged on the tube wall of the blood flow pipeline at the positions on the left side and the right side of the drainage tube, and two blood flow detection probes are respectively arranged in the two monitoring holes and are respectively used for detecting the blood flow velocity on the left side and the right side of the drainage tube in real time; the two blood flow detection probes are in communication connection with the controller, so that the controller performs feedback control on the electromagnetic drive coil according to the blood flow velocity.

As a further improvement of the technical scheme of the utility model, the blood flow probe is an ultrasonic Doppler type probe structure.

As a further improvement of the technical scheme of the utility model, the drainage cylinder is fixed in the sleeve through a bracket, and a gap is arranged between the outer wall of the drainage cylinder and the inner wall of the blood flow pipeline;

the support includes two piece at least along the bracing piece of the circumference evenly distributed of same circle, the lateral wall that the inner of bracing piece is fixed in the drainage tube, the outer end is fixed in the blood flow pipeline lateral wall, the wire passes and links to each other with the controller behind one of them bracing piece.

As a further improvement of the technical scheme of the utility model, the bracing piece adopts elastic material to make, the outer end of bracing piece is fixed in the blood flow pipeline inner wall.

As a further improvement of the technical proposal of the utility model, the supporting rod is a rigid rod structure; the blood flow pipeline is characterized in that a positioning hole in one-to-one correspondence with the supporting rod is formed in the pipe wall of the blood flow pipeline, a flexible ring sleeve covers the hole wall of the positioning hole, the top end of the flexible ring sleeve extends out of the positioning hole and then extends along the radial direction to form a pressing ring portion, the supporting rod is in interference fit with a central hole of the flexible ring sleeve and penetrates out of the pressing ring portion to be in threaded fit with a compression nut, and the compression nut is fixedly pressed on the top surface of.

Compared with the prior art, the utility model discloses following beneficial technological effect has:

the utility model provides a shaftless blood pump, its rotor is located the pump and spouts the passageway, namely the rotor is established in the drainage tube, can effectively reduce the spare part quantity of blood pump, has improved blood pump structure compactness, has reduced the disturbed possibility of blood flow, and blood pumps again after the water conservancy diversion and flows out simultaneously, is favorable to reducing the blood flow power loss, has promoted pumping efficiency; in addition, before blood gets into the pump and spouts the passageway, drainage channel drains peripheral blood flow to middle blood flow to utilize the kinetic energy of peripheral blood flow to improve the velocity of flow of middle blood flow, and then further improve the pumping efficiency of blood pump.

Drawings

FIG. 1 is a schematic structural view of a structure of the present invention;

FIG. 2 is an enlarged view of FIG. 1 at A;

FIG. 3 is an enlarged view of FIG. 1 at B;

fig. 4 is a schematic structural diagram of another structure of the present invention.

Detailed Description

In order to make the technical solution of the present invention better understood, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments; of course, the drawings are simplified schematic drawings, and the scale of the drawings does not limit the patented products.

Example 1

As shown in fig. 1 to 3: the embodiment provides a shaftless blood pump, which comprises a blood flow pipeline 1, a rotor arranged in the blood flow pipeline 1 and a drainage cylinder 2 coaxially fixed in the blood flow pipeline 1, wherein the rotor comprises a rotor cylinder 31 coaxially arranged with the blood flow pipeline 1 and rotor blades 32 fixed on the inner wall of the rotor cylinder 31; the two ends (left and right ends) of the drainage tube 2 are open and the interior is hollow.

The blood flow pipeline 1 is used for blood circulation, the length of the blood flow pipeline can be determined according to specific requirements, and a hard pipe structure is adopted; in fig. 1, the left side of the blood flow conduit 1 is a blood inflow port, and the right side is a blood outflow port, so the blood flow direction in this embodiment is a direction from left to right; the rotor cylinder 31 rotates to drive the rotor blades 32 to rotate, so that power for driving blood to flow is generated; the drainage tube 2 is arranged and positioned in the blood flow pipeline 1, and the drainage tube 2 is of a symmetrical rotary structure.

The shaftless blood pump of the embodiment has the main improvement point that a drainage channel 21 and a pump spray channel 22 are coaxially arranged in the hollow part of the drainage cylinder 2, the drainage channel 21 is in a circular truncated cone shape, the diameter of the drainage channel is gradually reduced along the blood flow direction, the pump spray channel 22 is in butt joint with the tail end of the drainage channel 21, and the rotor cylinder 31 is installed on the cylinder wall of the drainage cylinder 2 at the position of the pump spray channel 22 and is coaxially arranged with the pump spray channel 22.

The left end of the drainage channel 21 is a large-diameter end, the right end is a small-diameter end, and the central axis of the drainage channel coincides with the central axis of the blood flow pipeline 1; the drainage channel 21 is used for draining peripheral blood flow to intermediate blood flow so as to improve the flow velocity of the intermediate blood flow by utilizing the kinetic energy of the peripheral blood flow and further improve the pumping efficiency of the blood pump; the pump spraying channel 22 is a circular channel with a constant diameter, and the diameter of the pump spraying channel 22 is the same as that of the small end of the pump spraying channel 22, so that the butt joint of the tail ends of the pump spraying channel 22 and the drainage channel 21 is realized; the pump is located and is spouted passageway 22, and the rotor is established in drainage tube 2 promptly, can effectively reduce the spare part quantity of blood pump, has improved blood pump compact structure degree, has reduced the disorderly possibility of blood flow, and blood is through the pump sending outflow again after the water conservancy diversion simultaneously, is favorable to reducing the blood flow power loss, has promoted pumping efficiency.

In this embodiment, the outer wall of the rotor cylinder 31 is embedded with a permanent magnet 33, an electromagnetic driving coil 4 for driving the rotor cylinder 31 to rotate is further installed in the cylinder wall of the drainage cylinder 2, the electromagnetic driving coil 4 is connected with a controller 6 located outside the blood flow pipeline 1 through a conducting wire 5, and the controller 6 controls the current magnitude and direction in the electromagnetic driving coil 4 to generate an alternating magnetic field matched with the permanent magnet 33 to drive the rotor cylinder 31 to rotate. The electromagnetic driving coil 4 and the permanent magnet 33 form a magnetic coupling driving structure, which is the prior art and is not described herein again; under the control of the controller 6, the rotation speed and the rotation direction of the rotor cylinder 31 can be adjusted according to requirements; the controller 6 may be, for example, an existing one-chip microcomputer.

In this embodiment, the inner wall of the drainage tube 2 is provided with a rotor mounting groove 23 and bearing mounting grooves 24 located at two ends of the rotor mounting groove 23 and communicated with the rotor mounting groove 23, the rotor cylinder 31 is mounted in the rotor mounting groove 23 through a rotating bearing 7 arranged in the bearing mounting groove 24, and the inner wall of the rotor cylinder 31 is flush with the inner wall of the drainage tube 2 after mounting; the rotating bearing 7 is preferably of a ceramic bearing structure, is sleeved outside the rotor cylinder 31 and can improve the rotation flexibility of the rotor cylinder 31; the inner wall of the rotor cylinder 31 is flush with the inner wall of the drainage cylinder 2, which is beneficial to avoiding the contact of blood with the port of the rotor cylinder 31 and reducing the shearing damage to the blood. The wall of the drainage tube 2 is also provided with a coil mounting groove 25 and a wire passing hole 26 communicated with the coil mounting groove 25, the electromagnetic driving coil 4 is fixed (for example, by bonding) in the coil mounting groove 25, and the lead 5 penetrates the wire passing hole 26 to be connected with the electromagnetic driving coil 4. The rotor mounting groove 23 and the coil mounting groove 25 may communicate into one slot.

In this embodiment, the rotor blade 32 is a helical blade structure, and a helical blood flow channel is formed between the side wall of the rotor blade 32 and the inner wall of the rotor cylinder 31; when the rotor blades 32 rotate, blood enters the spiral blood flow channel and is accelerated in the spiral blood flow channel, so that damage to the blood is reduced, and the blood flow rate is improved.

In this embodiment, a fixed blade 27 is installed on the wall of the drainage tube 2 at the position of the drainage channel 21, the fixed blade 27 is a helical blade structure, and a helical blood channel is formed between the side wall of the fixed blade 27 and the inner wall of the drainage tube 2; the structure of the fixed blade 27 is similar to that of the rotor blade 32, but the fixed blade 27 is always fixed, and only the spiral blood channel is formed to accelerate blood, and when the accelerated blood enters the action area of the rotor blade 32, the circumferential speed is increased, so that the cavitation can be effectively avoided, the noise generated when the blood pump operates is reduced, and the damage to blood cells can be reduced.

In this embodiment, monitoring holes 11 are formed in the tube wall of the blood flow pipeline 1 at the positions on the left side and the right side of the drainage tube 2, and two blood flow detection probes 8 are respectively installed in the two monitoring holes 11 and are respectively used for detecting the blood flow velocity on the left side and the right side of the drainage tube 2 in real time; the two blood flow detection probes 8 are both in communication connection with the controller 6, so that the controller 6 performs feedback control on the electromagnetic driving coil 4 according to the blood flow velocity. The monitoring hole 11 is arranged along the radial direction of the blood flow pipeline 1 and can be a through hole or a blind hole, and when the monitoring hole is arranged as the through hole, sealing is needed to prevent blood from leaking; blood flow velocity before being located the effect of the 8 real-time detection rotors of blood flow detection probe on the left side of drainage tube 2, the blood flow velocity after the effect of the 8 real-time detection rotors of blood flow detection probe on the right side of drainage tube 2, these two blood flow velocity values have the interval of predetermineeing, when blood flow velocity after the effect of the blood flow velocity before the effect of the rotor or the effect of the rotor is less than the threshold value, controller 6 then reduces the rotational speed of rotor, thereby reach the effect of reducing power, then raise the power when the blood flow velocity after the effect of the rotor is greater than the threshold value, thereby realize automatic control. Preferably, the blood flow probe 8 is an ultrasonic doppler probe structure. The blood flow probing probe 8 may be connected to the controller 6 by wire or wirelessly.

In this embodiment, the drainage tube 2 is fixed in the sleeve by a bracket, and a gap is formed between the outer wall of the drainage tube 2 and the inner wall of the blood flow pipeline 1; the drainage tube 2 can be arranged in the blood flow pipeline 1 in a floating way through the bracket, so that a blood stagnation area is prevented from being formed between the side wall of the drainage tube 2 and the inner wall of the blood flow pipeline 1; as can be seen from fig. 1, this gap is gradually increased, and the size of the gap can be determined according to the needs. The support includes two piece at least along the bracing piece 28 of the circumference evenly distributed of same circle, the lateral wall that the inner of bracing piece 28 was fixed in drainage tube 2, the outer end is fixed in the blood flow pipeline 1 lateral wall, wire 5 links to each other with controller 6 after passing one of them bracing piece 28. The number of the supporting rods 28 is preferably three, and a triangular positioning structure is formed to support the drainage cylinder 2 together. The support rod 28 is a round rod structure to reduce the blockage of blood.

In this embodiment, the support rod 28 is a rigid rod structure, and the support rod 28 may be integrally disposed on the drainage tube 2 for easy forming; the blood flow pipeline comprises a blood flow pipeline 1 and is characterized in that positioning holes 12 corresponding to supporting rods 28 one to one are formed in the pipe wall of the blood flow pipeline 1, a flexible ring sleeve 91 covers the hole wall of each positioning hole 12, the top end of each flexible ring sleeve 91 extends out of the corresponding positioning hole 12 and then extends along the radial direction to form a pressing ring portion 92, the supporting rods 28 are in interference fit with the central holes of the flexible ring sleeves 91 and penetrate out of the pressing ring portions 92 to be in threaded fit with a pressing nut 93, and the pressing nut 93 is pressed and fixed on the. The flexible loop 91 may be made of rubber or silicone, for example; the aperture of the central hole of the flexible ring sleeve 91 is smaller than the rod diameter of the support rod 28, so that the flexible ring sleeve 91 can be radially extruded through the support rod 28, and the flexible ring sleeve 91 is fixed to achieve the effect of sealing the positioning hole 12; the pressing ring part 92 and the flexible ring sleeve 91 are connected to form a T shape; the pressing ring part 92 and the flexible ring sleeve 91 not only play a role in sealing, but also form flexible support for the support rod 28 so as to reduce the vibration transmitted along the support rod 28 generated during the movement of the rotor, reduce the running noise of the blood pump and prevent the support rod 28 and the blood flow pipeline 1 from being loosened due to resonance; the top end of the support rod 28 is provided with an external thread which is in threaded connection with the compression nut 93.

Example 2

As shown in fig. 4, the shaftless blood pump of this embodiment is substantially the same as the shaftless blood pump of embodiment 1, except that in this embodiment, the support rod 28 is made of an elastic material, and the outer end of the support rod 28 is fixed on the inner wall of the blood flow conduit 1; the vibration transmitted along the supporting rod 28 and generated during the movement of the rotor can be reduced, the running noise of the blood pump is reduced, and the supporting rod 28 and the blood flow pipeline 1 are prevented from being loosened due to resonance. The structure is particularly suitable for the occasions when the blood flow pipeline 1 is made of flexible materials, and the blood flow pipeline 1 and the supporting rod 28 can also be designed into an integrated mode.

Finally, it is stated that the specific individual example is used herein to explain the principle and the implementation of the present invention, and the explanation of the above embodiment is only used to help understand the core idea of the present invention, without departing from the principle of the present invention, it is also possible to make the present invention undergo several improvements and modifications, and these improvements and modifications also fall into the protection scope of the present invention.

Claims

1. A shaftless blood pump comprises a blood flow pipeline, a rotor arranged in the blood flow pipeline and a drainage cylinder coaxially fixed in the blood flow pipeline, wherein the rotor comprises a rotor cylinder coaxially arranged with the blood flow pipeline and rotor blades fixed on the inner wall of the rotor cylinder; the two ends of the drainage cylinder are open, and the interior of the drainage cylinder is hollow; the method is characterized in that:

2. A shaftless blood pump according to claim 1, wherein:

the outer wall of the rotor cylinder is embedded with a permanent magnet, an electromagnetic driving coil used for driving the rotor cylinder to rotate is further installed in the cylinder wall of the drainage cylinder, the electromagnetic driving coil is connected with a controller located outside the blood flow pipeline through a conducting wire, and the controller controls the size and the direction of current in the electromagnetic driving coil to generate an alternating magnetic field matched with the permanent magnet to drive the rotor cylinder to rotate.

3. A shaftless blood pump according to claim 2, wherein:

the inner wall of the drainage cylinder is provided with a rotor mounting groove and bearing mounting grooves which are positioned at two ends of the rotor mounting groove and communicated with the rotor mounting groove, the rotor cylinder is mounted in the rotor mounting groove through a rotating bearing arranged in the bearing mounting groove, and the inner wall of the rotor cylinder is flush with the inner wall of the drainage cylinder after mounting;

4. A shaftless blood pump according to claim 1, wherein:

the rotor blade is of a spiral blade type structure, and a spiral blood flow channel is formed between the side wall of the rotor blade and the inner wall of the rotor cylinder.

5. A shaftless blood pump according to claim 1, wherein:

the wall of the drainage tube, which is positioned at the drainage channel, is provided with a fixed blade, the fixed blade is of a helical blade type structure, and a helical blood flow channel is formed between the side wall of the fixed blade and the inner wall of the drainage tube.

6. A shaftless blood pump according to claim 2, wherein:

monitoring holes are formed in the positions, located on the left side and the right side of the drainage cylinder, on the tube wall of the blood flow pipeline, and the two blood flow detection probes are respectively installed in the two monitoring holes and are respectively used for detecting the blood flow speeds on the left side and the right side of the drainage cylinder in real time; the two blood flow detection probes are in communication connection with the controller, so that the controller performs feedback control on the electromagnetic drive coil according to the blood flow velocity.

7. The shaftless blood pump of claim 6, wherein:

the blood flow detection probe is of an ultrasonic Doppler probe structure.

8. A shaftless blood pump according to claim 3, wherein:

the drainage tube is fixed in the sleeve through a bracket, and a gap is formed between the outer wall of the drainage tube and the inner wall of the blood flow pipeline;

9. A shaftless blood pump according to claim 8, wherein:

the bracing piece adopts elastic material to make, the outer end of bracing piece is fixed in the blood flow pipeline inner wall.

10. A shaftless blood pump according to claim 8, wherein:

the supporting rod is of a rigid rod structure; the blood flow pipeline is characterized in that a positioning hole in one-to-one correspondence with the supporting rod is formed in the pipe wall of the blood flow pipeline, a flexible ring sleeve covers the hole wall of the positioning hole, the top end of the flexible ring sleeve extends out of the positioning hole and then extends along the radial direction to form a pressing ring portion, the supporting rod is in interference fit with a central hole of the flexible ring sleeve and penetrates out of the pressing ring portion to be in threaded fit with a compression nut, and the compression nut is fixedly pressed on the top surface of.