CN209301837U - An extracorporeal blood pump capable of reducing hemolysis - Google Patents

Abstract

The utility model provides a kind of external blood pump that can reduce haemolysis, including pump case；Pump case is equipped with pump inlet and pump discharge；A cavity is equipped in pump case, the cavity is connected to pump inlet and pump discharge；Rotatable vane rotor is equipped in cavity；The vane rotor lower end stretches out cavity and extends to pump case；The part that vane rotor stretches out pump case is connect by sealing element and bearing with pump case, and vane rotor bottom connects motor.The external blood pump described in the utility model that haemolysis can be reduced, the blood pump are to have an axis centrifugal pump, and to be placed on pump outer for the components such as bearing, and not with contacting blood, processing technology is simple, low cost, and can effectively reduce the generation of haemolysis.

Description

An extracorporeal blood pump capable of reducing hemolysis

technical field

The utility model belongs to the field of medical devices, in particular to an extracorporeal blood pump which can be widely used in extracorporeal circulation devices and can reduce hemolysis.

Background technique

Blood pumps, also known as artificial heart pumps, can be divided into implantable blood pumps and blood pumps in extracorporeal assistive devices. Implantable blood pumps can be divided into total artificial heart and heart assisting devices according to the auxiliary methods. The pumps are small in size, complicated in control and high in cost. The blood pump in the extracorporeal auxiliary device is generally large in size, but the cost is low, so that the important part of the extracorporeal circulation device can partially or completely replace the pump function of the heart and maintain a good blood circulation throughout the body. Cardiovascular surgery, tumor therapy, extracorporeal membrane oxygenation (ECMO), organ transplantation and other shell fields.

Clinical extracorporeal blood pumps include roller pumps and centrifugal pumps. Roller pumps are not easy to move, difficult to manage, and will generate a large extrusion force while pumping blood, causing hemolysis. Therefore, centrifugal pumps are the first choice for extracorporeal blood pumps in first aid professions. However, the current extracorporeal blood pump still has the problems of high price and easy occurrence of complications such as hemolysis.

Contents of the invention

In view of this, the utility model aims to propose an extracorporeal blood pump capable of reducing hemolysis to overcome the defects of the prior art. The blood pump is a centrifugal pump with a shaft, and components such as bearings are placed outside the pump without contact with blood. The processing technology is simple, the cost is low, and the occurrence of hemolysis can be effectively reduced.

In order to achieve the above object, the technical solution of the utility model is achieved in that:

An extracorporeal blood pump capable of reducing hemolysis, comprising a pump casing; a pump inlet and a pump outlet are arranged on the pump casing; a cavity is arranged inside the pump casing, and the cavity communicates with the pump inlet and the pump outlet; A rotatable impeller rotor; the lower end of the impeller rotor protrudes from the cavity and extends to the pump casing; the part of the impeller rotor protruding from the pump casing is connected to the pump casing through a seal and a bearing, and the bottom end of the impeller rotor is connected to a motor.

Further, there is a groove on the outer surface of the bottom of the pump casing, and the seal and the bearing are both engaged in the groove; the seal is located on the upper end of the bearing and fits on the top of the groove.

Further, the groove is stepped, and the inner diameter of the upper end is smaller than the inner diameter of the lower end; the seal is located at the upper end of the groove, the bearing is located at the lower end of the groove, and the bottom of the bearing is flush with the bottom of the groove.

Further, the impeller rotor includes several blades, guide cones, bosses and shafts, and a distance is left between the several blades, guide cones and bosses and the surrounding wall of the cavity; the guide cone and the pump inlet The positions correspond to each other, and there is a gap between the two; the guide cone, several blades and bosses are arranged sequentially from top to bottom, and the adjacent two are fixedly connected; the upper end of the shaft passes through at least sequentially from the bottom The through hole in the middle of the boss and the area surrounded by several vanes are connected to the bottom of the diversion cone; the lower end of the shaft protrudes from the cavity and extends to the pump casing; the position of the shaft below the cavity is connected to the pump casing in a gap.

Further, several blades are evenly distributed along the outer circumference of the bottom of the diversion cone, and the plurality of blades, the diversion cone and the shaft form an "umbrella" shape; all the blades extend to the outside of the boss; the part where the lower end of the shaft protrudes from the pump casing passes The seals and bearings are connected to the pump casing, and the lowest end of the shaft is connected to the motor through a coupling.

Further, the boss is ring-shaped, and the inner diameter of the boss is larger than the diameter of the shaft; the upper end of the shaft is integrally formed with the diversion cone or is detachably connected, and the detachable connection can be threaded connection, plug-in, etc.; the shaft is located at The gap between the position below the cavity and the pump casing is 0.02-0.2 μm.

Further, the upper surface of the boss slopes downward from the middle to the edge, and the outer surface of the boss is a tapered surface with a large top and a small bottom; the diameter of the blood pump impeller is 40-80mm.

Further, the connection between the outer surface and the lower surface of the boss, the connection between the inner peripheral surface and the lower surface, and the connection between the inner peripheral surface and the upper surface are all rounded.

Further, the cavity is in the shape of a ladder with a large top and a small bottom.

Further, the pump inlet is located at the top of the pump housing, and the pump outlet is located at one side of the pump housing.

Compared with the prior art, an extracorporeal blood pump capable of reducing hemolysis described in the utility model has the following advantages:

(1) Compared with the magnetic levitation type, it has shaft connection, simple control and stable connection;

(2) The bearing is placed outside the pump, without contact with blood, reducing hemolysis; and the processing cost is low, and expensive bearing parts are not required

(3) The processing technology is good, the gap between the heat exchange shafts of the pump bottom shell can be reduced to 0.02-0.2 μm, and the normal diameter of red blood cells is 8 μm, so red blood cells cannot enter the gap, which greatly reduces the occurrence of hemolysis.

(4) The rotation speed is low, so the wear of the blade on the red blood cells is reduced, and the occurrence of hemolysis is greatly reduced.

The utility model relates to an extracorporeal blood pump capable of reducing hemolysis. The blades, diversion cones and bosses form the rotating part of the pump. Compared with the existing general magnetic levitation blood pump whose diameter is between 20-40mm, under the conditions of flow rate 4-6L/min and head 80-120mmHg, the rotational speed of the magnetic levitation blood pump is 2800-3200rpm. An extracorporeal blood pump capable of reducing hemolysis, the distance between the shaft and the lower shell of the pump (that is, the gap between the shaft and the joint of the pump shell at the lower end of the cavity) can be controlled at 0.2- 2μm, and the diameter of the blood pump impeller is between 40-80mm, under the corresponding flow and head conditions, the corresponding speed is 1900-2500rpm. In addition, the distance between the control shaft and the lower shell of the pump (that is, the gap between the shaft and the connection between the pump shell at the lower end of the cavity) is controlled at 0.2-2 μm, while the average diameter of red blood cells is 7-8 μm, and red blood cells cannot enter The gap between the shaft and the lower casing of the pump can reduce the occurrence of hemolysis and thrombus.

Description of drawings

The accompanying drawings constituting a part of the utility model are used to provide a further understanding of the utility model, and the schematic embodiments of the utility model and their descriptions are used to explain the utility model, and do not constitute improper limitations to the utility model. In the attached picture:

Fig. 1 is a perspective view of an extracorporeal blood pump capable of reducing hemolysis described in an embodiment of the present invention;

Fig. 2 is a top view of the extracorporeal blood pump capable of reducing hemolysis described in the embodiment of the present invention;

Fig. 3 is the sectional view of A-A plane among Fig. 2;

Fig. 4 is a front view of the extracorporeal blood pump capable of reducing hemolysis described in the embodiment of the present invention;

Fig. 5 is the sectional view of B-B plane among Fig. 4;

Fig. 6 is a perspective view of the impeller rotor of the extracorporeal blood pump capable of reducing hemolysis according to the embodiment of the present invention.

Explanation of reference signs:

1-pump casing; 2-pump inlet; 3-pump outlet; 4-cavity; 5-impeller rotor; 501-blade; 502-guiding cone; 503-boss; 504-shaft; - bearing; 8 - motor; 9 - coupling.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

In describing the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention. Novel and simplified descriptions do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the utility model. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, a feature defined as "first", "second", etc. may expressly or implicitly include one or more of that feature. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention through specific situations.

The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

As shown in Figures 1-6, an extracorporeal blood pump capable of reducing hemolysis includes a pump casing 1; a pump inlet 2 and a pump outlet 3 are provided on the pump casing 1; a cavity 4 is provided inside the pump casing 1, and the cavity The cavity 4 communicates with the pump inlet 2 and the pump outlet 3; the cavity 4 is provided with a rotatable impeller rotor 5; the lower end of the impeller rotor 5 protrudes from the cavity 4 and extends to the pump casing 1; the impeller rotor 5 extends out of the pump casing 1 The part is connected with the pump casing 1 through the seal 6 and the bearing 7, and the motor 8 is connected to the bottom end of the impeller rotor 5. Seals can be biocompatible glands and gaskets etc.

There is a groove on the outer surface of the bottom of the pump housing 1, and the seal 6 and the bearing 7 are engaged in the groove; the seal 6 is located on the upper end of the bearing 7 and fits on the top of the groove.

The groove is stepped, and the inner diameter of the upper end is smaller than the inner diameter of the lower end; the seal 6 is located at the upper end of the groove, the bearing 7 is located at the lower end of the groove, and the bottom of the bearing 7 is flush with the bottom of the groove.

The impeller rotor 5 includes several blades 501, guide cones 502, bosses 503 and shafts 504, and some blades 501, guide cones 502 and bosses 503 all leave a distance with the peripheral wall of the cavity 4; The guide cone 502 corresponds to the position of the pump inlet 2, and there is a gap between the two; the guide cone 502, several blades 501 and the boss 503 are arranged in sequence from top to bottom, and the adjacent two are fixedly connected The upper end of the shaft 504 passes through at least the cylindrical through hole in the middle of the boss 503 and the area surrounded by several blades 501 from the bottom to connect with the bottom of the diversion cone 502; the lower end of the shaft 504 extends out of the cavity 4 and extends to the pump The casing 1; the position of the shaft 504 located below the cavity 4 is in clearance connection with the pump casing 1 . There is a space between the cylindrical through hole and the shaft. The diversion cone, the vane and the boss are fixedly connected to form a rotating part. During processing, the shaft and the boss can be processed together, and then the vane and the boss, the diversion cone and the vane are welded by laser.

Several blades 501 are evenly distributed along the outer circumference of the bottom of the guide cone 502, and several blades 501, guide cone 502 and shaft 504 form an "umbrella" shape; several blades 501 extend outside the boss 503; the lower end of the shaft 504 protrudes Parts of the pump casing 1 are connected to the pump casing 1 through a seal 6 and a bearing 7 , and the lowermost end of the shaft 504 is connected to the motor 8 through a coupling 9 .

The boss 503 is annular, and the inner diameter of the boss 503 is larger than the diameter of the shaft 504; the upper end of the shaft 504 is integrally formed with the guide cone 502; the gap between the shaft 504 below the cavity 4 and the pump housing 1 is 0.05 μm.

The upper surface of the boss 503 slopes downward from the middle to the edge, and the outer surface of the boss 503 is a tapered surface with a large upper part and a smaller lower part; the diameter of the impeller of the blood pump is 60mm; the inner periphery of the boss 503 is a cylindrical surface.

The connection between the outer surface and the lower surface of the boss 503, the connection between the inner peripheral surface and the lower surface, and the connection between the inner peripheral surface and the upper surface are all rounded.

The cavity 4 is in the shape of a ladder with a large top and a small bottom.

The pump inlet 2 is located at the top of the pump housing 1 , and the pump outlet 3 is located at one side of the pump housing 1 .

The total number of the blades 501 is five.

The working process of this embodiment is:

The motor 8 drives the shaft 504 to rotate, and then drives the guide cone 502 and the vanes 501 to rotate. During operation, blood flows in from the pump inlet 2, and due to the centrifugal force generated by the rotation of the blades 501, the blood flows to the pump outlet 3 to complete the blood flow process. During this process, since there is a gap between the shaft 504 and the circular through hole in the center of the boss 503, blood can flow out from the gap between the two, increasing the fluid's scouring of the central cylindrical wall of the boss 503 and the surface of the shaft 504. At the same time, the fluid at the bottom of the boss 503 is driven to flow upward along the gap between the boss 503 and the shaft 504 . Avoid blood stagnation at the bottom of the boss 503, further reduce the formation of thrombus.

Compared with the magnetic levitation pump, the extracorporeal blood pump described in this embodiment that can reduce hemolysis adopts the shafted 504 pump, the processing technology is simpler, no complex control system is needed, and the operation is very stable. Since the sealing member 6 and the bearing 7 are placed in the pump lower casing (the bottom of the pump casing is away from the side of the cavity 4), they are not in contact with blood, which can avoid the problem of bearing 7 wearing and tearing blood, and effectively reduce the occurrence of hemolysis. Because the bearing 7 is placed outside the blood, the material of the bearing 7 does not need expensive special materials, which effectively reduces the cost of the bearing 7 . At the same time, the existing processing technology can control the distance between the shaft 504 and the lower casing of the pump at 0.05 μm, while the average diameter of red blood cells is 7-8 μm, and the red blood cells cannot enter the gap between the shaft 504 and the lower casing of the pump, reducing hemolysis and thrombosis. The extracorporeal blood pump that can reduce hemolysis described in this embodiment is slightly larger than the general magnetic levitation blood pump, but the rotation speed is smaller, which can effectively ensure the lift, reduce the wear of the blades 501 on red blood cells, and reduce hemolysis to the greatest extent.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in the Within the protection scope of the present utility model.

Claims (10)

1. the external blood pump that one kind can reduce haemolysis, it is characterised in that: including pump case (1)；Pump case (1) be equipped with pump into Mouth (2) and pump discharge (3)；A cavity (4) are equipped in pump case (1), the cavity (4) and pump inlet (2) and pump discharge (3) are even It is logical；Rotatable vane rotor (5) are equipped in cavity (4)；Vane rotor (5) lower end is stretched out cavity (4) and is extended to outside pump Shell (1)；The part that vane rotor (5) stretches out pump case (1) is connect by sealing element (6) and bearing (7) with pump case (1), and Vane rotor (5) bottom connects motor (8).

2. the external blood pump according to claim 1 that haemolysis can be reduced, it is characterised in that: pump case (1) bottom There are a groove, sealing element (6) and bearings (7) to be fastened in the groove for outer surface；Sealing element (6) is located at bearing (7) Upper end, and be bonded with the top of groove.

3. the external blood pump according to claim 2 that haemolysis can be reduced, it is characterised in that: the groove be it is ladder-like, The internal diameter of upper end is less than the internal diameter of lower end；The sealing element (6) is located at the upper end of groove, and bearing (7) is located at the lower end of groove, and The bottom of bearing (7) is concordant with the bottom of groove.

4. the external blood pump according to claim 1 that haemolysis can be reduced, it is characterised in that: vane rotor (5) packet Include several blades (501), deflection cone (502), boss (503) and axis (504), and several blades (501), deflection cone (502) and There are spacing between the peripheral wall of cavity (4) for boss (503)；The deflection cone (502) is opposite with the position of pump inlet (2) It answers, and there are spacing between the two；The deflection cone (502), several blades (501) and boss (503) are successively set from top to bottom It sets, and adjacent the two is fixedly connected；Axis (504) upper end boss (503) is at least sequentially passed through under if intermediate through-hole and The region that cured leaf piece (501) surrounds is connect with deflection cone (502) bottom；The lower end of axis (504) is stretched out cavity (4) and is extended to outside pump Shell (1)；Axis (504) is located at the position below cavity (4) and connect with pump case (1) gap.

5. the external blood pump according to claim 4 that haemolysis can be reduced, it is characterised in that: lead on several blades (501) edges Flow cone (502) bottom cylindrical week is uniformly distributed, and several blades (501), deflection cone (502) and axis (504) constitute " umbrella " shape；If Cured leaf piece (501) all extends to boss (503) outside；The position that pump case (1) is stretched out in axis (504) lower end passes through sealing element (6) it is connect with bearing (7) with pump case (1), and the bottom of axis (504) passes through shaft coupling (9) connection motor (8).

6. the external blood pump according to claim 4 that haemolysis can be reduced, it is characterised in that: the boss (503) is cyclic annular, And the internal diameter of boss (503) is greater than the diameter of axis (504)；The upper end of axis (504) and deflection cone (502) integrated molding or detachable Connection；Axis (504) is located at position below cavity (4) and pump case (1) gap is 0.02-0.2 μm.

7. the external blood pump of haemolysis can be reduced according to claim 4 or 6, it is characterised in that: boss (503) upper surface It is tilted down from centre to edge, the lateral surface of boss (503) is the up big and down small conical surface；Blood pump impeller diameter is 40-80mm.

8. the external blood pump according to claim 7 that haemolysis can be reduced, it is characterised in that: on the outside of the boss (503) The junction of face and lower surface, the junction of inner peripheral surface and lower surface, inner peripheral surface and upper surface junction be equipped with rounding.

9. the external blood pump according to claim 1 that haemolysis can be reduced, it is characterised in that: the cavity (4) is upper big Under it is small ladder-like.

10. the external blood pump according to claim 1 that haemolysis can be reduced, it is characterised in that: the pump inlet (2) is located at The top of pump case (1), pump discharge (3) are located at the side of pump case (1).