CN113771301A - Connecting piece for blood pump bearing and forming die thereof - Google Patents

Abstract

The invention relates to the technical field of medical instruments, in particular to a connecting piece for a blood pump bearing and a forming die thereof; the cleaning device comprises a cover body, wherein the cover body is provided with a cavity for accommodating a bearing, the inside of the cover body is communicated with a cleaning pipe, and the outside of the cover body is connected with a cable; the invention has the beneficial effects that: (1) the connecting piece is provided, which can be used for accommodating a blood pump bearing, and simultaneously separates cleaning fluid around the bearing from a circuit structure, so that the normal and stable operation of the blood pump function is ensured; (2) the forming die for the connecting piece has the advantages of high production efficiency, stable quality, easiness in demoulding and the like.

Description

Connecting piece for blood pump bearing and forming die thereof

Technical Field

The invention relates to the technical field of medical instruments, in particular to a connecting piece for a blood pump bearing and a forming die thereof.

Background

Blood pumps can support patient cardiac function, providing hemodynamic support for cardiogenic shock or acute heart failure in short-term applications (days or weeks) or long-term applications (weeks or months). Blood pumps are known in various types, such as axial flow blood pumps, centrifugal blood pumps or mixed blood pumps, and include a pump housing having a cavity in which an electric motor is disposed, and an impeller. The rotor of the motor is a permanent magnet, the rotor is arranged on the rotating shaft and coupled to the impeller, the stator is provided with a coil winding and is arranged coaxially with the rotor, after current is introduced, an interactive electromagnetic field can be formed between the winding and the permanent magnet, and axial force and/or radial force are generated to enable the rotor and the impeller to form circumferential synchronous rotation so as to pump blood in a ventricle into an artery to realize blood flow.

To ensure the correct position and attitude of the impeller in the blood pump, the shaft connecting the impeller needs to be mounted within the pump housing by two bearings, with the impeller-side bearing being adjacent to the blood environment and away from the impeller-side bearing being adjacent to the connection site of the cable and windings. On the side adjacent to the blood environment, the rotating shaft and the impeller in the pump move in a coupling manner, and a clearance exists between the pump shell and the rotating shaft in a movable fit manner, so that blood can permeate into the pump shell through the clearance. The blood components are complex, and when the blood components flow through the internal structure of the pump shell, the risk of thrombosis is generated, so that potential safety hazards are caused. To avoid blood infiltration into the blood pump, a cleaning fluid (e.g., heparin, glucose solution, etc.) may be employed to extend from the body of the blood pump into the blood pump and to cause fluid to flow from the impeller side for outward movement of the blood to prevent the blood from entering the blood pump or from condensing into a thrombus. The inflow port of the cleaning fluid is generally adjacent to the connecting site of the cable and the winding, and in order to prevent the cleaning fluid from contacting the electric connecting site and damaging the function of the blood pump, the cleaning fluid passage and the electric connecting passage need to be isolated from each other, and the isolation effect between the water passage and the circuit is difficult to ensure by adopting a polymer encapsulation and solidification mode in the prior art.

Disclosure of Invention

The invention mainly aims to provide a connecting piece for a bearing of a blood pump, which comprises a cover body, wherein the cover body is provided with a cavity for accommodating the bearing, the inside of the cover body is communicated with a cleaning pipe, and the outside of the cover body is connected with a cable. The bearing is accommodated in the inner cavity of the cover body structure through the arrangement, and the cleaning pipe is connected into the cover body, so that the normal flow of fluid in the cleaning pipe is ensured, the contact between the internal fluid and an external circuit structure is also avoided, and the normal operation of the blood pump is effectively ensured.

Preferably, the cover is formed by enclosing a first cover and a second cover. The two housings are combined for use, so that the assembly and the allocation are easy.

Preferably, a gap exists between the first cover and the second cover, and the gap is filled with an adhesive. When the blood pump is applied to a blood pump and operates, a motor in the blood pump runs at a high speed to drive blood to flow and generate heat, and under the thermal expansion effect, a gap structure between the first encloser and the second encloser can provide a buffer space for thermal expansion.

As the preferred technical scheme, the end part of the first cover shell is provided with a through hole for arranging the rotating shaft, and the aperture of the through hole is larger than the radial size of the rotating shaft. Therefore, the first cover shell and the rotating shaft form clearance fit, and a flow path can be provided for the cleaning fluid.

As preferred technical scheme, the aperture of through-hole is not greater than stator core external diameter for when the assembly, stator core's tip and first housing lean on, like this when the embedment, the glue solution can not follow through-hole infiltration cover body in, avoid hindering the relative motion of bearing and pivot.

As a preferable technical scheme, the end part of the second housing is provided with a connecting hole for arranging a cleaning pipe, and the second housing and the cleaning pipe form a fastening fit at the connecting hole, so that the cleaning fluid can be prevented from leaking to damage a circuit structure.

As preferred technical scheme, be equipped with the connecting pipe that is used for connecting the scavenge pipe on the connecting hole, constitute the fastening cooperation between scavenge pipe and the connecting pipe, it is specific, can adopt the mode of gluing between scavenge pipe and the connecting pipe, the setting up of connecting pipe has prolonged the length of gluing of scavenge pipe and second housing, has guaranteed the firm in connection degree of second housing with the scavenge pipe promptly.

As the preferred technical scheme, the near-end pipe diameter of the connecting pipe is large, and the far-end pipe diameter is small, so that the cleaning pipe can be conveniently inserted, glue liquid can be conveniently filled, and a limiting function is provided.

Preferably, the end face of the second housing protrudes outward, so that a gap exists between the internal rotating shaft and the end of the second housing, and a flowing space is provided for the fluid in the cleaning pipe to enter the housing.

As a preferred technical scheme, the contour position of the cover body is optionally provided with a chamfer/rounding structure so as to be suitable for assembly and a blood pump application environment.

Preferably, an annular gasket is attached to an end face of the second housing, and a metal sheet connected to the cable is provided on the gasket. Through the form of peripheral hardware gasket, can make circuit and water route separate completely, guarantee the operating stability of blood pump.

As a preferable technical scheme, the peripheries of the through hole and the connecting hole are provided with steps for mounting the bearing, and the shape of the step surface is matched with that of the bearing so as to fix the correct posture and position of the bearing.

As a preferable technical scheme, the outer walls of the cover body or the first and second housings are axially provided with wire grooves. The winding coil winding on the stator core is electrically connected with the cable, and the groove can be internally provided with an electric wire for realizing the electrical connection between the winding coil winding and the cable, so that the consistency of the thickness of the peripheral wall glue solution can be kept when the blood pump is integrally encapsulated.

As a preferable technical scheme, 1-5 grooves are arranged at intervals in the circumferential direction of the metal sheet.

The invention also aims to provide a forming die of the connecting piece, which comprises an upper die base, a lower die base, an upper die frame and a lower die frame, wherein the upper die frame and the lower die frame are used for fixing the upper die base and the lower die base, an upper male die and a lower female die are respectively arranged on the upper die base and the lower die base, a die cavity for accommodating a cover body is enclosed between the upper male die and the lower female die, a feeding main pipe which extends from the outside to the lower female die is arranged on the lower die base, a power mechanism drives the upper die base to be close to or far away from the lower die base, the number of the die cavities is more than or equal to 2, and feeding branch pipes which lead to each die cavity from the feeding main pipe are arranged on the forming surface of the upper male die and the lower female die. When the die is used, a plurality of sets of connecting pieces can be formed by the die at the same time, and the production efficiency is effectively improved. Preferably, the upper die base and the lower die base are made of metal materials so as to provide enough hardness support and have high temperature resistance and easy demoulding performance.

According to the preferable technical scheme, the upper male die comprises a first male die adaptive to the shape of an inner cavity of a first housing and a second male die adaptive to the shape of an inner cavity of a second housing, the lower female die comprises a first female die adaptive to the shape of the periphery of the first housing and a second female die adaptive to the shape of the periphery of the second housing, a die cavity for containing the first housing is formed by the first male die and the first female die in a surrounding mode, a die cavity for containing the second housing is formed by the second male die and the second female die in a surrounding mode, one end pipe orifice of the feeding branch pipe is communicated with the die cavity, and the other end pipe orifice of the feeding branch pipe is communicated with the feeding main pipe.

According to the preferable technical scheme, one end of the feeding branch pipe, which is adjacent to the die cavity, is in a closing-in shape with the pipe diameter gradually reduced. The contact area between the structure on the feeding pipeline and the die cavity is reduced as much as possible, and after the polymer is solidified and molded, the solidified waste on the pipeline can be conveniently separated from the molded connecting piece.

According to the preferable technical scheme, the heating device further comprises a heating unit, the heating unit comprises heat insulation plates coated around the upper die base and the lower die base and heating pipes for heating the upper die base and the lower die base, and the heating pipes extend through the heat insulation plates from the outside and are inserted into the upper die base and the lower die base. Due to the size limitation of the structure in the blood pump in the blood application scene, the connecting piece is required to be thin enough, have biocompatibility and better mechanical property and mechanical strength, so the types of materials for manufacturing the connecting piece are limited, and exemplarily, the material of the connecting piece selected by the invention is TPU or PEEK; in particular, hard TPU; preferably, it is PEEK. The melting point of PEEK is more than three hundred ℃, and when a molten material is injected into a mold cavity or in the molding process of the mold, if heat preservation is not carried out, the situation that the high-temperature material is solidified suddenly when cooled can occur, so that a fault is formed between the subsequently injected material liquid and the solidified material liquid, and the physical property and the service performance of the molded connecting piece are influenced. Through heat preservation treatment, the stability of the quality of the connecting piece can be ensured.

The invention has the beneficial effects that:

(1) the connecting piece can be used for accommodating a blood pump bearing, and simultaneously separates cleaning fluid around the bearing from a circuit structure, so that the normal and stable operation of the blood pump function is ensured.

(2) The forming die for the connecting piece has the advantages of high production efficiency, stable quality, easiness in demoulding and the like.

Drawings

FIGS. 1 to 2 are schematic views showing the structure of a connector according to embodiment 1 of the present invention;

FIG. 3 is a schematic view showing a state of use of a connector according to embodiment 1 of the present invention;

FIG. 4 is a schematic perspective view of a mold according to example 2 of the present invention;

FIG. 5 is a schematic structural view of the lower die holder of FIG. 4;

FIG. 6 is a schematic structural view of the upper die holder shown in FIG. 4;

fig. 7 is a schematic perspective view of the lower die holder in fig. 4.

Detailed Description

The present invention will be described in further detail with reference to the attached drawings, which are provided for illustrative purposes only and are not intended to limit the scope of the present invention.

EXAMPLE 1 attachment for blood Pump bearings

Referring to fig. 1-2, a connector for a bearing of a blood pump comprises a cover body, wherein a cavity for accommodating a bearing A is arranged in the cover body; during the use, it is internal to make the washing fluid let in the cover, and the circuit is located outside the cover, can avoid inside fluid and external circuit structure's contact like this, effectively guarantees the normal operating of blood pump. Preferably, the contour of the cover body is optionally provided with a chamfer/rounding structure at the position of the contour so as to be suitable for assembly and blood pump application environment.

For ease of assembly and deployment, the housing is formed by enclosing the first and second housings 10,20, and further, to meet the mechanical strength, thermal stability and biocompatibility requirements for a small size structure, the first and second housings 10,20 may be made of a material, such as rigid TPU or PEEK, for example, PEEK. According to the preferable technical scheme, a gap exists between the first encloser 10 and the second encloser 20, when the device is used, the first encloser 10 and the second encloser 20 can be adhered and solidified by using an adhesive, when the device is applied to a blood pump and operates, a motor in the blood pump runs at a high speed to drive blood to flow so as to generate heat, and under the thermal expansion effect, a gap structure between the first encloser 10 and the second encloser 20 can provide a buffer space for thermal expansion. Specifically, the peripheries of the through hole 11 and the connecting hole 21 are provided with steps for mounting the bearing a, and the shape of the step surface is adapted to the shape of the bearing a, so as to fix and ensure the correct posture and position of the bearing a.

The end of the first housing 10 is provided with a through hole 11 for arranging the rotating shaft B, and the aperture of the through hole 11 is larger than the radial dimension of the rotating shaft B, so that the first housing 10 and the rotating shaft B form clearance fit, and a flow path can be provided for cleaning fluid. Preferably, the aperture of the through hole 11 is not larger than the outer diameter of the stator core (not shown), so that when the stator core (not shown) is assembled, the end of the stator core (not shown) abuts against the first housing 10, and thus, when the stator core is encapsulated, the glue solution cannot seep into the housing from the through hole 11, and the obstruction of the relative movement of the bearing a and the rotating shaft B is avoided.

The end part of the second housing 20 is provided with a connecting hole 21 for arranging a cleaning pipe C, and the second housing 20 and the cleaning pipe C form fastening fit at the connecting hole 21; the cleaning fluid can be prevented from leaking out to damage the circuit structure. The connecting hole 21 is provided with a connecting pipe 22, and the connecting pipe 22 is tightly matched with the connecting hole 21 and the cleaning pipe C; specifically, can adopt the mode of gluing between scavenge pipe C and the connecting pipe 22, the setting up of connecting pipe 22 has prolonged the length of gluing of scavenge pipe C and second housing 20, has guaranteed second housing 20 and scavenge pipe C's firm in connection degree promptly. The near-end pipe diameter of the connecting pipe 22 is large, and the far-end pipe diameter is small, so that the cleaning pipe C can be conveniently inserted, glue liquid can be conveniently filled, and a limiting function is provided. Preferably, the end surface of the second housing 20 protrudes outward, so that a gap exists between the internal rotation shaft B and the end of the second housing 20, and a flowing space is provided for the fluid in the cleaning pipe C to enter the housing. Preferably, an annular gasket 30 is attached to the end of the second housing 20, the annular gasket 30 is disposed around the connection hole 21, a metal sheet 31 connected to the cable D is disposed on the gasket 30, and the cable D can be conveniently mounted and the operation stability of the blood pump can be ensured by externally disposing the gasket 30, so that the circuit and the water path can be completely separated and the operation stability of the blood pump can be ensured.

The outer walls of the housing or first and second housings 10,20 are provided with wire grooves 12 in the axial direction. The coil winding (not marked in the figure) wound on the stator iron core (not marked in the figure) is electrically connected with the cable D, and an electric wire (not marked in the figure) for realizing the electrical connection between the coil winding and the cable D can be placed in the groove 12, so that when the blood pump is integrally encapsulated, the consistency of the thickness of glue solution on the peripheral wall of the blood pump can be kept. Preferably, the grooves 12 are arranged 1-5, for example 3, at intervals in the circumferential direction of the metal sheet 31.

EXAMPLE 2 Molding die for connecting Member

Referring to fig. 3 to 6, a molding die for a connecting member, the structure of which is shown in example 1, includes upper and lower bases 100 and 200, a heating unit 300, and upper and lower mold frames 410 and 420.

The upper die holder 100 and the lower die holder 200 are made of metal, an upper male die 110 and a lower female die 210 are respectively arranged on the upper die holder 100 and the lower die holder 200, and a die cavity for accommodating the cover body is enclosed between the upper male die 110 and the lower female die 210; a feeding manifold 220 extending from the outside to the lower female die 210 is arranged on the lower die holder 200, feeding branch pipes 230 leading from the feeding manifold 220 to the die cavities are arranged on the molding surfaces of the upper male die 110 and the lower female die 210, and a power mechanism (not shown) drives the upper die holder 100 to be close to or far away from the lower die holder 200; the upper male die 110 comprises a first male die 111 adapting to the shape of the inner cavity of the first housing 10 and a second male die 112 adapting to the shape of the inner cavity of the second housing 20, the lower female die 210 comprises a first female die 211 adapting to the shape of the outer periphery of the first housing 10 and a second female die 212 adapting to the shape of the outer periphery of the second housing 20, a die cavity A for accommodating the first housing 10 is enclosed between the first male die 111 and the first female die 211, a die cavity B for accommodating the second housing 20 is enclosed between the second male die 112 and the second female die 212, one end pipe orifice of the feeding branch pipe 230 is communicated with the die cavity, and the other end pipe orifice is communicated with the feeding main pipe 220, so that the feed liquid can be dispersed into the die cavity A and the die cavity B, particularly, the number of the die cavities (formed by the die cavities A and the die cavities B) is not less than 2, namely, the dies can simultaneously form a plurality of connecting pieces, and the production efficiency is effectively improved; specifically, one end of the feeding branch pipe 230 adjacent to the mold cavity is in a shape of a mouth with a gradually decreasing pipe diameter. The contact area between the structure on the feeding pipeline and the die cavity is reduced as much as possible, and after the material liquid is solidified and formed, the solidified waste on the pipeline can be conveniently separated from the formed connecting piece.

The heating unit 300 includes a heat-insulating plate 310 wrapped around the upper and lower die holders 100,200 and a heating pipe 320 for heating the upper and lower die holders 100,200, and the heating pipe 320 extends through the heat-insulating plate 310 from the outside and is inserted into the upper and lower die holders 100, 200. Due to the size limitations of structures in blood pumps in the blood application scenario, which leads to the necessity of a connector that is sufficiently thin, biocompatible, and mechanically strong, the materials used to make the connector are limited, for example, rigid TPU or PEEK, preferably PEEK. The melting point of PEEK is more than three hundred ℃, and when a molten material is injected into a mold cavity or in the molding process of the mold, if heat preservation is not carried out, the situation that the high-temperature material is solidified suddenly when cooled can occur, so that a fault is formed between the subsequently injected material liquid and the solidified material liquid, and the physical property and the service performance of the molded connecting piece are influenced. Through heat preservation treatment, the stability of the quality of the connecting piece can be ensured.

The upper and lower die holders 100,200 are fixed to upper and lower die frames 410,420, respectively.

According to the preferable technical scheme, the upper die base and the lower die base are respectively fixed on the upper die base and the lower die base so as to be convenient for demolding.

The above description of the specific embodiments of the present invention is not intended to limit the present invention, and those skilled in the art may make various changes and modifications according to the present invention without departing from the spirit of the present invention, which is defined in the appended claims.

Claims (10)

1. A connecting piece for a blood pump bearing is characterized in that: the cleaning device comprises a cover body, wherein the cover body is provided with a cavity for accommodating a bearing (A), the inside of the cover body is communicated with a cleaning pipe (C), and a cable (D) is connected to the outside of the cover body.

2. A connector for a bearing of a blood pump according to claim 1, wherein: the cover body is formed by enclosing a first cover shell (10) and a second cover shell (20), preferably, a gap exists between the first cover shell (10) and the second cover shell (20), and the gap is filled with adhesive.

3. A connector for a bearing of a blood pump according to claim 2, wherein: the end of the first housing (10) is provided with a through hole (11) for arranging a rotating shaft (B), the aperture of the through hole (11) is larger than the radial size of the rotating shaft (B), and preferably, the aperture of the through hole (11) is larger than the outer diameter of the stator core.

4. A connector for a bearing of a blood pump according to claim 2, wherein: a connecting hole (21) for arranging a cleaning pipe (C) is formed in the end part of the second housing (20), and the second housing (20) and the cleaning pipe (C) are tightly matched at the connecting hole (21); preferably, a connecting pipe (22) is arranged on the connecting hole (21), and the connecting pipe (22) is tightly matched with the connecting hole (21) and the cleaning pipe (C); it is also preferable that the connecting tube (22) has a large proximal tube diameter and a small distal tube diameter.

5. A connector for a bearing of a blood pump according to claim 2, wherein: the end face of the second cover shell (20) protrudes outwards; preferably, an annular gasket (30) is attached to the end face of the second housing (20), and a metal sheet (31) connected with the cable (D) is arranged on the gasket (30).

6. A connector for a bearing of a blood pump according to claim 2, wherein: the outer walls of the cover body or the first and second cover shells (10,20) are axially provided with lead grooves (12); it is also preferable that the grooves (12) are arranged at intervals of 1 to 5 in the circumferential direction of the metal sheet (31).

7. A forming die of a connecting piece according to any one of claims 1 to 6, which comprises an upper die base (100), a lower die base (100,200), an upper die frame (410) and a lower die frame (420) for fixing the upper die base (100,200), wherein an upper male die (110) and a lower female die (210) are respectively arranged on the upper die base (100) and the lower die base (200), a die cavity for accommodating a cover body is enclosed between the upper male die (110) and the lower female die (210), a feeding manifold (220) extending from the outside to the lower female die (210) is arranged on the lower die base (200), and a power mechanism drives the upper die base (100) to be close to or far away from the lower die base (200), and is characterized in that: the number of the die cavities is more than or equal to 2, and feeding branch pipes (230) leading to each die cavity from a feeding main pipe (220) are arranged on the molding surface of the upper male die (110) and the lower female die (210).

8. The molding die for a connecting member according to claim 7, wherein: the upper male die (110) comprises a first male die (111) adapting to the shape of an inner cavity of the first housing (10) and a second male die (112) adapting to the shape of an inner cavity of the second housing (20), the lower female die (210) comprises a first female die (211) adapting to the shape of the periphery of the first housing (10) and a second female die (212) adapting to the shape of the periphery of the second housing (20), a die cavity for accommodating the first housing (10) is enclosed between the first male die (111) and the first female die (211), a die cavity for accommodating the second housing (20) is enclosed between the second male die (112) and the second female die (212), one end pipe orifice of the feeding branch pipe (230) is communicated with the die cavity, and the other end of the feeding branch pipe (230) is communicated with the feeding main pipe (220).

9. The molding die for a connecting member according to claim 7, wherein: one end of the feeding branch pipe (230) adjacent to the die cavity is in a closing-in shape with the pipe diameter gradually reduced.

10. The molding die for a connecting member according to claim 7, wherein: the heating device further comprises a heating unit (300), wherein the heating unit (300) comprises an insulation board (310) wrapped around the upper die holder (100) and the lower die holder (200) and a heating pipe (320) for heating the upper die holder (100) and the lower die holder (200), and the heating pipe (320) extends through the insulation board (310) from the outside and is inserted into the upper die holder (100) and the lower die holder (200).

Images