CN2326258Y

CN2326258Y - Pump-machine two-in-one impeller-type ventricle-aid apparatus

Info

Publication number: CN2326258Y
Application number: CN 98226532
Authority: CN
Inventors: 钱坤喜
Original assignee: Jiangsu Science & Engineering Univ
Current assignee: Jiangsu Science & Engineering Univ; Jiangsu University of Science and Technology
Priority date: 1998-04-16
Filing date: 1998-04-16
Publication date: 1999-06-30
Anticipated expiration: 2008-04-16

Abstract

The utility model discloses a ventricle-aid device with pump-motor combination of an impeller type, which belongs to the field of medical devices, and the ventricle-aid device is formed by combining a motor and a blood pump. The utility model is characterized in that the housing 1 of the blood pump is fixed to a stator coil 7 of the motor, an impeller 2 is fixed to a rotor 3 of the motor, and an inner hole of the rotor forms a press fit with a shaft sleeve 6 and forms a radial sliding bearing with a central shaft 5. Compared with the common centrifugal blood pump, the structure has the advantages that an outer circle of the coil directly drives and replaces the magnetic-coupling driving of the end surface of the coil, the radial sliding bearing is used for replacing a ball bearing, and an axial thrust bearing is canceled. Therefore, the utility model avoids the danger of bearing blocking caused by thrombus, enhances operational reliability, and prolongs service life.

Description

The vane type ventricular assist device of pump machine unification

This utility model relates to medical instruments field, is mainly used in the heart of auxiliary patient's depletion, to keep normal blood circulation.

At present, more and more widely the ventricular assist device of Ying Yonging is the centrifugal type blood pump, and as the Biomedicus centrifugal blood pump of the U.S., it is made up of the motor and the blood pump of split, as shown in Figure 1.Its primary structure is such: impeller 2 ＇ and rotor magnetic steel 3 ＇ are fixed together, and are supported by axial thrust bearing 11 and radial ball bearing 10.After disc coil 4 ＇ of stator energising produced rotating excitation field, disc magnet steel 3 ＇ that drive rotor through magnetic coupling principle rotated, and blood is executed the living centrifugal force of changing the line of production with impeller, flows into from import 9 ＇, and 8 ＇ flow out by outlet.This auxiliary device does not need to prevent the valve of blood flow refluence; Do not need to produce the diaphragm of haemocoele volume-variation; Simple in structure; Control is convenient; Cost is low.But the place is easy to generate thrombosis because of this blood pump bearing, and generally can only can not satisfy clinical needs far away its service life about 2 days.

The purpose of this utility model provides a kind of motor and blood pump and is combined into an integral body, is directly driven by cylindrical and replace the end face magnetic coupling to drive, replaced ball bearing and cancelled the vane type new equipment of thrust bearing by bush(ing) bearing.

The purpose of this utility model is achieved in that

It is made up of motor and blood pump two parts, and the shell of blood pump is fixed on the shell of coil of stator of motor; Impeller is fixed on the rotor, and rotor can rotate freely on central shaft.Behind the cylindrical stator coil electricity of motor, produce rotating excitation field in the air gap between circle and the rotor cylindrical within it, drive epitrochanterian cylindrical shape magnet steel rotation, thereby drives impeller is rotated, blood just sucks from the import of the pump housing, flows out from outlet, shown among Fig. 29 and 8.Stator coil and rotor complete immersion are in blood, and it is just unnecessary to seal.The contact surface of this ventricle assistor all and blood is all used macromolecule material coating, has avoided the corrosion of material and the destruction of blood component.

Concrete structure of the present utility model is provided by the following drawings and embodiment:

Fig. 1 is a U.S. Biomedicus centrifugal blood pump structural representation

Fig. 2 is this utility model structural representation.

Label among Fig. 1 is represented respectively: 1 ＇. the blood pump shell; 2 ＇. impeller; 3 ＇. rotor magnetic steel; 4 ＇. coil of stator of motor; 7 ＇. motor housing; 8 ＇. blood stream outlet; 9 ＇. the blood flow import; 10. radial ball bearing; 11. axial thrust bearing.

Label among Fig. 2 is represented respectively: 1. blood pump shell; 2. impeller; 3. rotor magnetic steel; 4. coil of stator of motor; 5. central shaft; 6. axle sleeve; 7. motor housing; 8. blood stream outlet; 9. blood flow import.

Now describe concrete structure in conjunction with the accompanying drawings in detail;

As shown in Figure 2, two combine into one constitutes by motor and blood pump two parts for this utility model.It is characterized by: the shell 1 usefulness fine thread of blood pump is fastened on the coil of stator of motor shell 7; Impeller 2 usefulness left-hand threads are fastened on the rotor 3; Rotor 3 can rotate freely on central shaft 5; Rotor inner hole is press-fitted and is embedded with Ceramic shaft sleeve 6.The axial location of rotor 3 allows to have slight endwisely slipping by the power that attracts each other and the hydraulic coupling decision of rotor magnetic guiding principle and iron-core coil on central shaft during working rotor.

Advantage of the present utility model: compare with U.S. Biomedicus centrifugal blood pump, the utility model except Outside the cancellation magnetic coupling drives, directly drive replacement coil end face magnetic coupling by the coil magnetic field cylindrical and drive; And Replace ball bearing by bush(ing) bearing, and the cancellation axial thrust bearing, avoid causing bearing because of thrombus Stuck danger has improved functional reliability, has prolonged working life. According to the attached Jiang Bin doctor of Zhenjiang medical college The cardiothoracic surgery animal experiments such as institute and Fuwai Hospital, Beijing and clinic trial prove, basically can satisfy clinical Upper rescue acute heart failure the need of patient. The utility model can be stablized the aid blood circulation about two months. This To bring glad tidings to the patient.

Claims

1. the vane type ventricular assist device of pump machine unification, it is made up of motor and blood pump, it is characterized in that: the shell of blood pump (1) is fixed on the coil of stator of motor (7); Impeller (2) is fixed on the rotor (3).

2. the vane type ventricular assist device of a kind of pump machine unification according to claim 1, it is characterized in that: impeller (2) connects with left-hand thread.

3. the vane type ventricular assist device of a kind of pump machine unification according to claim 1, it is characterized in that: rotor inner hole is press-fitted axle sleeve (6), forms bush(ing) bearing with central shaft (5).