Medical centrifugal pump head

Abstract

The invention discloses a medical centrifugal pump head, and relates to the technical field of medical instruments, the medical centrifugal pump head comprises a pump shell, a rotating disc and a motor, a liquid flow channel is arranged in the pump shell, a containing cavity is formed in the inner side wall of the liquid flow channel, a soft rubber pressing strip is arranged in the containing cavity, a plurality of connecting ports are formed in the side wall of the liquid flow channel, and a jacking block is slidably arranged in each connecting port; and a crimping part is arranged on the turntable. When the rotating disc rotates, the pressing connection part pushes the jacking block to extrude the soft rubber pressing strip, so that the soft rubber pressing strip generates periodic deformation, a pulsating flow field is formed in the liquid flow channel, blood can be effectively prevented from forming a vortex and a retention area in the flowing process in the liquid flow channel, and the thrombus formation risk is fundamentally reduced. The structure avoids the friction heat problem of a traditional mechanical bearing, protein in blood is not prone to denaturation and the like, the biocompatibility of the blood is ensured, meanwhile, cleaning, disinfection, maintenance and replacement are convenient, and remarkable technical progress and clinical application value are achieved.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and in particular to a medical centrifugal pump head. Background Technology

[0002] Centrifugal blood pumps, as core equipment in extracorporeal life support systems, play a vital role in clinical scenarios such as cardiac surgery and extracorporeal membrane oxygenation (ECMO). Traditional centrifugal pumps drive blood flow by generating centrifugal force through impeller rotation, and their impellers typically use a mechanical shaft and bearing support structure to achieve rotational motion.

[0003] However, this mechanical support method has significant technical drawbacks: First, the mechanical bearing generates considerable frictional resistance during high-speed rotation, which not only reduces energy conversion efficiency but, more seriously, causes localized temperature increases due to frictional heat, potentially leading to protein denaturation in the blood and affecting blood biocompatibility. Second, the complex structure of the mechanical bearing creates a complex flow field distribution within the pump, easily generating blood vortices and flow stagnation zones. These areas exhibit slow or even stagnant blood flow, providing conditions for platelet aggregation and fibrin deposition, significantly increasing the risk of thrombosis. Once a thrombus forms and detaches into the bloodstream, it can trigger fatal complications such as cerebral embolism and pulmonary embolism, seriously threatening the patient's life. Therefore, developing a novel centrifugal pump head that can fundamentally reduce the risk of thrombosis and improve blood compatibility from a structural perspective has become an urgent technical challenge to be solved in this field. Summary of the Invention

[0004] In view of the problems existing in the prior art, this application provides a medical centrifugal pump head.

[0005] This application provides a medical centrifugal pump head, which adopts the following technical solution: A medical centrifugal pump head includes a pump housing, a turntable rotatably disposed within the pump housing, and a motor for driving the turntable to rotate. A fluid flow channel for supplying blood is provided within the pump housing and along the circumference of the turntable. The pump housing has an inlet and an outlet communicating with the fluid flow channel. A receiving cavity is provided on the inner sidewall of the fluid flow channel, and a soft rubber strip is disposed within the receiving cavity. The soft rubber strip is disposed along the extension direction of the fluid flow channel. Multiple connection ports communicating with the receiving cavity are opened on the sidewall of the fluid flow channel. A top support block is slidably disposed within each connection port. Each top support block is distributed along the extension direction of the fluid flow channel and abuts against the soft rubber strip. A pressing part is provided on the turntable, which is used to push each top support block to slide towards the fluid flow channel.

[0006] Optionally, the interior of the soft rubber strip is provided with several air bladder cavities, which are arranged along the extension direction of the soft rubber strip and correspond one-to-one with the top support block.

[0007] Optionally, the pressing part is an arc-shaped protrusion structure.

[0008] Optionally, the pump housing is provided with elastic elements for driving each of the top support blocks to slide away from the liquid flow channel.

[0009] Optionally, the end of the top support block away from the soft rubber strip is rotatably provided with several rollers for rolling connection with the pressing part.

[0010] Optionally, the liquid flow channel has an opening at its top, and a cover plate is fixed to the top of the liquid flow channel by screws to close the opening at the top of the liquid flow channel. The soft rubber strip is detachably installed in the receiving cavity, and a fixing structure for fixing the soft rubber strip is provided in the receiving cavity.

[0011] Optionally, the fixing structure includes a crimping frame and a locking screw. The inner sidewall of the liquid flow channel is provided with an installation groove communicating with the accommodating cavity. The crimping frame is adapted to the installation groove. A retaining strip is fixedly provided at the bottom end of the crimping frame. A retaining groove for the retaining strip to be inserted is provided on the lower sidewall of the installation groove. The crimping frame is fixed in the installation groove by the locking screw and is used to press the edge of the soft rubber strip into the installation groove.

[0012] Optionally, a sealing ring is provided on the edge of the soft rubber strip along the circumference of the soft rubber strip, and an annular sealing groove is provided on the side wall of the mounting groove. The annular sealing groove is adapted to the sealing ring and is used for the sealing ring to be inserted.

[0013] Optionally, the inlet and the end connecting the liquid flow channel, as well as the outlet and the end connecting the liquid flow channel, are each provided with a guide section. The sidewall of the guide section is inclined to connect the liquid flow channel with the inlet or outlet.

[0014] Optionally, the pump casing is provided with a heat dissipation channel, and the side wall of the heat dissipation channel is provided with a plurality of heat dissipation ports communicating with the inner cavity of the pump casing. The pump casing is provided with an exhaust port communicating with the heat dissipation channel, and a centrifugal fan is provided in the heat dissipation channel.

[0015] In summary, this application includes at least one of the following beneficial technical effects: 1. This application utilizes a soft rubber strip and a top support block structure. As the turntable rotates, the pressing part pushes the top support block to compress the soft rubber strip, causing it to deform periodically. This creates a pulsating flow field within the fluid channel. This structure effectively prevents the formation of vortices and stagnation zones in the blood flow, thus preventing platelet aggregation and fibrin deposition, fundamentally reducing the risk of thrombosis. Simultaneously, this pulsed blood supply method promotes blood mixing and reduces blood stratification and coagulation to some extent. Furthermore, the optimized flow channel design prevents the formation of high shear stress areas within the fluid channel, effectively protecting the integrity of blood cells. Moreover, this design avoids the frictional heat problems of traditional mechanical bearings, and prevents protein denaturation in the blood, effectively ensuring the biocompatibility of the blood.

[0016] 2. This application provides an air bladder cavity inside the soft rubber strip, with each air bladder cavity corresponding to a top support block. When the top support block compresses the soft rubber strip, the air bladder cavity can more smoothly transition the deformation state at the contact point between the top support block and the soft rubber strip, further improving blood flow and preventing the formation of vortices and stagnation zones during blood flow within the fluid channel.

[0017] 3. This application significantly reduces frictional resistance, energy loss and heat generation by setting rollers at the end of the top support block to form a rolling connection with the pressing part, while improving the service life of the equipment.

[0018] 4. This application provides a heat dissipation channel inside the pump casing, which is connected to the inner cavity of the pump casing through a heat dissipation port. An exhaust port connected to the heat dissipation channel is provided on the pump casing, and a centrifugal fan is installed inside the heat dissipation channel. This allows the heat generated inside the pump casing to be quickly and effectively dissipated through the heat dissipation channel, preventing excessively high local temperatures inside the pump casing from causing denaturation of blood proteins and improving the blood compatibility and operational safety of the equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a cross-sectional view of the overall structure of an embodiment of this application; Figure 3 This is a cross-sectional view of the structure of the fluid flow channel used in the embodiments of this application; Figure 4 This is a structural schematic diagram illustrating a fixed structure according to an embodiment of this application; Figure 5 This is a cross-sectional view of the structure of the heat dissipation channel used in the embodiments of this application.

[0020] Explanation of reference numerals in the attached drawings: 100, pump casing; 101, turntable; 102, motor; 103, fluid flow channel; 104, inlet; 105, outlet; 106, receiving cavity; 107, soft rubber strip; 108, top support block; 109, crimping part; 110, air bladder cavity; 111, roller; 112, elastic element; 113, cover plate; 114, crimping frame; 115, locking screw; 116, mounting groove; 117, retaining strip; 118, retaining groove; 119, sealing ring; 120, annular sealing groove; 121, heat dissipation channel; 122, heat dissipation vent; 123, exhaust port; 124, centrifugal fan. Detailed Implementation

[0021] The following will be combined with the appendix Figure 1 -Appendix Figure 5 The technical solutions in the embodiments of the present invention are clearly and completely described herein. The described embodiments are only possible technical implementations of the present invention and not all possible implementations. Those skilled in the art can obtain other embodiments in conjunction with the embodiments of the present invention without creative effort, and these embodiments are also within the protection scope of the present invention.

[0022] This application primarily employs a scheme where a rotary table drives a top support block to compress a soft rubber strip, creating a pulsating flow field. This achieves the effects of reducing the risk of thrombosis and improving blood compatibility. The following is a further detailed description of this application: This application discloses a medical centrifugal pump head. (Refer to...) Figure 1 and Figure 2The pump includes a pump housing 100, a turntable 101, and a motor 102. The turntable 101 is rotatably mounted inside the pump housing 100, and the motor 102 is fixedly mounted outside the pump housing 100 to drive the turntable 101 to rotate. A fluid flow channel 103 is provided inside the pump housing 100 along the circumference of the turntable 101 for supplying blood flow. An inlet 104 and an outlet 105 communicating with the fluid flow channel 103 are respectively provided on the pump housing 100. A receiving cavity 106 is provided on the inner wall of the fluid flow channel 103, and a soft rubber strip 107 is provided within the receiving cavity 106, the soft rubber strip 107 being arranged along the extending direction of the fluid flow channel 103. The sidewall of the fluid flow channel 103 has multiple connection ports communicating with the receiving cavity 106. A support block 108 is slidably disposed within each connection port. The support blocks 108 are distributed along the extension direction of the fluid flow channel 103 and abut against the soft rubber strip 107. A pressing part 109 is provided on the turntable 101, which pushes each support block 108 towards the fluid flow channel 103. This structural arrangement allows the pressing part 109 to periodically push the support blocks 108 to compress the soft rubber strip 107 when the turntable 101 rotates under the drive of the motor 102. This causes the soft rubber strip 107 to deform periodically, creating a pulsating flow field within the fluid flow channel 103. This pulsating flow field effectively prevents the formation of vortices and stagnation zones in the blood during flow within the fluid flow channel 103, preventing platelet aggregation and fibrin deposition, and fundamentally reducing the risk of thrombosis. Meanwhile, the pulsed blood supply method promotes blood mixing, reduces blood stratification and clotting. Furthermore, it avoids the frictional heat problems of traditional mechanical bearings, and prevents protein denaturation in the blood, effectively ensuring blood biocompatibility.

[0023] Reference Figure 1 Specifically, the pump housing 100 is generally made of high-strength, corrosion-resistant medical-grade plastic or metal materials, such as stainless steel or titanium alloy, to ensure its structural strength and biocompatibility. It includes an upper housing and a lower housing, which are fixed together by bolts. The position and size of the inlet 104 and outlet 105 are designed according to the actual blood delivery requirements.

[0024] Reference Figure 2 The turntable 101 is typically made of lightweight, high-strength materials, such as aluminum alloy or carbon fiber, to reduce inertia and energy loss during rotation. The surface of the turntable 101 is smoothed to minimize damage to the blood. A pressing part 109 is located at the edge of the turntable 101, and its shape and size are designed according to the dimensions and movement requirements of the top support block 108. The pressing part 109 has an arc-shaped protrusion structure, which allows for smooth contact with the top support block 108, reducing impact and vibration, ensuring the smooth rotation of the turntable 101, and simultaneously making the deformation of the soft rubber strip 107 more uniform, forming a stable pulsating flow field.

[0025] Reference Figure 2 The inlet 104 and the flow channel 103 are connected by a guide section, as are the outlet 105 and the flow channel 103. The sidewalls of the guide section are inclined to connect the flow channel 103 with the inlet 104 or the outlet 105. The guide section design allows for smoother blood flow, reduces flow resistance and energy loss, and avoids turbulence and vortices at the inlet and outlet, further reducing the risk of thrombosis. The inclination angle and length of the guide section are designed according to actual blood flow requirements.

[0026] Reference Figure 2 and Figure 3 The soft rubber pressure strip 107 is made of a soft rubber material with good elasticity and biocompatibility, such as silicone or natural rubber. The soft rubber pressure strip 107 has several air bladder cavities 110 inside, which are arranged along the extension direction of the soft rubber pressure strip 107 and correspond one-to-one with the top support block 108. When the top support block 108 compresses the soft rubber pressure strip 107, the air bladder cavities 110 can more smoothly transition the deformation state at the contact point between the top support block 108 and the soft rubber pressure strip 107, further improving blood flow and preventing the formation of vortices and stagnation zones during blood flow within the fluid channel 103. The external shape of the soft rubber pressure strip 107 is adapted to the receiving cavity 106 to ensure that it can be tightly installed within the receiving cavity 106, preventing leakage.

[0027] Reference Figure 3 The top support block 108 is generally made of high-strength, wear-resistant materials, such as stainless steel or ceramic. The top support block 108 is typically cylindrical or square in shape, and its dimensions are adapted to the connection port to ensure free sliding within the port. Several rollers 111 are rotatably mounted on the end of the top support block 108 away from the soft rubber strip 107 for rolling connection with the pressing part 109. The rollers 111 employ rolling bearings or other rolling structures to reduce frictional resistance between the top support block 108 and the pressing part 109, thereby improving the operating efficiency and service life of the equipment.

[0028] Reference Figure 2 The pump housing 100 is equipped with elastic elements 112 for driving each support block 108 to slide away from the liquid flow channel 103. The elastic element 112 is generally made of elastic steel sheet, one end of which is fixed to the side wall of the support block 108 by screws, and the other end of the elastic steel sheet abuts against the side wall of the liquid flow channel 103. The elastic element 112 enables the support block 108 to quickly return to its original position, ensuring that the support block 108 always remains in a tight position against the turntable 101. This allows the soft rubber strip 107 to undergo regular periodic deformation while ensuring the smoothness of the deformation, thereby creating a continuous and stable pulsating flow field within the liquid flow channel 103 and preventing blood oscillation. Alternatively, the elastic element 112 can also be a spring.

[0029] Reference Figure 3 The top of the fluid flow channel 103 has an opening, and a cover plate 113 is fixed to the top of the fluid flow channel 103 with screws to seal the opening. A soft rubber strip 107 is detachably mounted within the receiving cavity 106 via a fixing structure. This detachable design facilitates maintenance, cleaning, and disinfection of the pump head's interior, reducing the risk of infection, and also allows for easy replacement of the soft rubber strip 107, improving the maintainability of the equipment. Furthermore, to improve the sealing performance of the cover plate 113 to the opening of the fluid flow channel 103, both the top of the cover plate 113 and the top of the fluid flow channel 103 are smoothed to reduce damage to the blood. A sealing gasket is also provided between the fluid flow channel 103 and the cover plate 113.

[0030] Reference Figure 4 The fixing structure includes a crimping frame 114 and a locking screw 115. The inner wall of the liquid flow channel 103 has a mounting groove 116 communicating with the receiving cavity 106. The sidewall of the mounting groove 116 is inclined, and the crimping frame 114 is adapted to the mounting groove 116. A retaining strip 117 is fixedly installed at the bottom end of the crimping frame 114. The lower sidewall of the mounting groove 116 has a retaining groove 118 for the retaining strip 117 to be inserted into. The crimping frame 114 is fixed in the mounting groove 116 by the locking screw 115, which is used to press the edge of the soft rubber strip 107 into the mounting groove 116. The cooperation of the retaining strip 117 and the retaining groove 118 ensures the stable installation of the crimping frame 114 in the mounting groove 116. The locking screw 115 further strengthens the fixing effect of the crimping frame 114, preventing the soft rubber strip 107 from shifting or falling off during operation, ensuring the stability and safety of the equipment operation.

[0031] Reference Figure 4 A sealing ring 119 is provided around the edge of the soft rubber strip 107 along its circumference. An annular sealing groove 120 is provided on the side wall of the mounting groove 116. The annular sealing groove 120 is adapted to the sealing ring 119 and is used for the sealing ring 119 to be engaged. The sealing ring 119 is generally made of rubber material, possessing good elasticity and sealing performance. The size and shape of the annular sealing groove 120 are adapted to the sealing ring 119 to ensure that the sealing ring 119 can be tightly embedded in the annular sealing groove 120, achieving a reliable seal between the soft rubber strip 107 and the mounting groove 116, preventing blood from seeping into the receiving cavity 106, and avoiding the formation of new thrombosis risk areas.

[0032] Reference Figure 2 and Figure 5The pump casing 100 is equipped with a heat dissipation channel 121, and the side wall of the heat dissipation channel 121 has multiple heat dissipation vents 122 communicating with the inner cavity of the pump casing 100. The pump casing 100 is equipped with an exhaust port 123 communicating with the heat dissipation channel 121. A centrifugal fan 124 is installed inside the heat dissipation channel 121. The heat dissipation channel 121 generally adopts a circular or square pipe structure, and its size is designed according to the heat dissipation requirements. When the centrifugal fan 124 rotates, it can dissipate the heat inside the pump casing 100 through the heat dissipation channel 121, preventing excessively high local temperatures inside the pump casing 100 from causing blood protein denaturation, and improving the blood compatibility and operational safety of the equipment.

[0033] The implementation principle of a medical centrifugal pump head in this embodiment is as follows: The medical centrifugal pump head of this embodiment, through a unique structural design, utilizes the pressing part 109 to push the top support block 108 to squeeze the soft rubber strip 107 when the turntable 101 rotates, causing the soft rubber strip 107 to undergo periodic deformation, forming a pulsating flow field in the liquid flow channel 103. This structure can effectively prevent the formation of vortices and stagnation areas in the blood during the flow of blood in the liquid flow channel 103, prevent platelet aggregation and fibrin deposition, and fundamentally reduce the risk of thrombosis.

[0034] Meanwhile, this pulsed blood supply method can also promote blood mixing and reduce blood stratification and clotting to some extent. Furthermore, the optimized flow channel design prevents the formation of high shear stress areas within the fluid flow channel 103, effectively protecting the integrity of blood cells.

[0035] Furthermore, this design avoids the frictional heat problems of traditional mechanical bearings, and prevents protein denaturation in the blood, effectively ensuring blood biocompatibility. Compared with traditional centrifugal blood pumps, the medical centrifugal pump head of this embodiment has significant advantages in reducing the risk of thrombosis, improving blood compatibility, reducing energy consumption, and improving equipment maintainability, providing a more reliable blood delivery device for clinical medicine.

[0036] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A medical centrifugal pump head, characterized in that: The system includes a pump housing (100), a turntable (101) rotatably disposed within the pump housing (100), and a motor (102) for driving the turntable (101) to rotate. A fluid flow channel (103) for supplying blood flow is provided within the pump housing (100) and circumferentially along the turntable (101). The pump housing (100) is provided with an inlet (104) and an outlet (105) communicating with the fluid flow channel (103). An accommodating cavity (106) is provided on the inner wall of the fluid flow channel (103), and a soft rubber strip (107) is provided within the accommodating cavity (106). The adhesive strip (107) is arranged along the extension direction of the liquid flow channel (103). The side wall of the liquid flow channel (103) is provided with multiple connection ports communicating with the accommodating cavity (106). A top support block (108) is slidably arranged in each connection port. Each top support block (108) is distributed along the extension direction of the liquid flow channel (103), and the top support block (108) abuts against the soft adhesive strip (107). A pressing part (109) is provided on the turntable (101). The pressing part (109) is used to push each top support block (108) to slide towards the liquid flow channel (103).

2. A medical centrifugal pump head according to claim 1, characterized in that: The soft rubber strip (107) has several air bladder cavities (110) inside. The air bladder cavities (110) are arranged along the extension direction of the soft rubber strip (107) and correspond one-to-one with the top support block (108).

3. A medical centrifugal pump head according to claim 1, characterized in that: The pressing part (109) is an arc-shaped protrusion structure.

4. A medical centrifugal pump head according to claim 3, characterized in that: The pump housing (100) is provided with elastic elements (112) for driving each of the top support blocks (108) to slide away from the liquid flow channel (103).

5. A medical centrifugal pump head according to claim 3, characterized in that: The top support block (108) is rotatably provided with several rollers (111) at the end away from the soft rubber strip (107) for rolling connection with the pressing part (109).

6. A medical centrifugal pump head according to claim 1, characterized in that: The liquid flow channel (103) has an opening at the top, and a cover plate (113) is fixed to the top of the liquid flow channel (103) by screws to close the opening at the top of the liquid flow channel (103). The soft rubber strip (107) is detachably installed in the accommodating cavity (106), and a fixing structure for fixing the soft rubber strip (107) is provided in the accommodating cavity (106).

7. A medical centrifugal pump head according to claim 6, characterized in that: The fixing structure includes a crimping frame (114) and a locking screw (115). The inner sidewall of the liquid flow channel (103) is provided with an installation groove (116) that communicates with the accommodating cavity (106). The crimping frame (114) is adapted to the installation groove (116). A retaining strip (117) is fixedly provided at the bottom end of the crimping frame (114). The lower sidewall of the installation groove (116) is provided with a retaining groove (118) for the retaining strip (117) to be inserted. The crimping frame (114) is fixed in the installation groove (116) by the locking screw (115) and is used to press the edge of the soft rubber strip (107) into the installation groove (116).

8. A medical centrifugal pump head according to claim 7, characterized in that: A sealing ring (119) is provided on the edge of the soft rubber strip (107) along the circumference of the soft rubber strip (107), and an annular sealing groove (120) is provided on the side wall of the mounting groove (116). The annular sealing groove (120) is adapted to the sealing ring (119) and is used for the sealing ring (119) to be inserted.

9. A medical centrifugal pump head according to claim 1, characterized in that: The inlet (104) and the liquid flow channel (103) are connected by a flow guide section, as are the outlet (105) and the liquid flow channel (103). The sidewall of the flow guide section is inclined and is used to connect the liquid flow channel (103) with the inlet (104) or the outlet (105).

10. A medical centrifugal pump head according to claim 1, characterized in that: The pump casing (100) is provided with a heat dissipation channel (121), and the side wall of the heat dissipation channel (121) is provided with a plurality of heat dissipation ports (122) communicating with the inner cavity of the pump casing (100). The pump casing (100) is provided with an exhaust port (123) communicating with the heat dissipation channel (121), and a centrifugal fan (124) is provided in the heat dissipation channel (121).

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