CN201020069Y

CN201020069Y - Cardiac apex ventricle wall inner minitype axial flow pump

Info

Publication number: CN201020069Y
Application number: CNU2007201479589U
Authority: CN
Inventors: 李国荣; 朱晓东
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-04-29
Filing date: 2007-04-29
Publication date: 2008-02-13
Anticipated expiration: 2017-04-29

Abstract

A miniature axial flow pump installed in apex chamber wall for treatment of terminal heart failures, which is connected with the heart chambers and large arterial vessels, wherein the pump body consists of a stator, a barrel-shaped pump pipe, a motor rotor, an impeller wheel, tail guide blades and a rotating shaft support system, wherein the front cantilever that is fixed and extends along the pipe wall from the input end to the center of the barrel-shaped pump pipe provides a support to the front end shaft of the impeller wheel rotator; an annular suture skirt inserting groove is arranged in the middle part of the pump outer wall formed by the stator shell, and divides the pump body into an front section and a back section; a knitted suture skirt is tied in the inserting groove, and during implantation, the annular suture of the suture skirt is connected to the outer surface of the apex cardiac muscle to fix the blood pump; the suture skirt can prevent the front section of the pump from projecting into the heart chamber, and the front section of the pump is only implanted into the wall muscle of the apex chamber; therefore no foreign body enters the heart chamber and the pump inlet can be directly communicated with the heart chamber; no guide blades arranged at the inlet end of the pump, blood flow at the inlet end maintains the rotational component to enhance washing of the heart chambers; besides, the absence of inlet pipelines can reduce the contact surface between blood and foreign bodies, which can prevent thrombosis.

Description

Micro axial flow pump in the apex of the heart locular wall

Technical field

This utility model relates to a kind of implantable artificial heart auxiliary device for the treatment of the heart failure in late period, it is a kind of micro axial flow pump that is implanted in the apex of the heart locular wall, connect ventricular chamber and large artery trunks blood vessel, by the ventricle inner blood being delivered directly to the method lightening heart load in the large artery trunks, auxiliary failure heart.

Background technology

The treatment of heart failure is the clinical important topic of present cardiovascular.Though Drug therapy has obtained very much progress in recent years,, adopt medicine to be difficult in separately and keep good peripheral circulation when lowering cardiac load for extreme exhaustion's heart.Explore new treatment means effectively and just become exigence.Many researchers adheres to exploring with the blood pump of implanted auxiliary for a long time or alternative heart pump function.Recently, existing abroad multiple implantable heart-assist device is applied to clinical, has obtained significant curative effect.But because physiology or dissection consistency problem, the various auxiliary device of present stage all can cause severe complications such as thrombosis, thromboembolism, so can not realize the prolonged application of implantable cardiac auxiliary device.In order to reduce complication, people are trying to explore various novel heart-assist devices, develop the focus that small-sized even micro axial flow pump more becomes this field.

At present, the axial-flow type auxiliary blood pump of development is to make interface from apex the left ventricle inner blood is drained in the blood pump both at home and abroad.Such small-sized axial flow blood pump need connect the pipeline of ventricular chamber and pump intake when implant into body, as: " the MicroMed DeBakey " of the U.S. (DeBakey ME, Teitel ER.Use of theMicroMed DeBakey VAD for the treatment of end-stage heart failure.Expert RevMed Devices.2005; 2 (2): 137-40), not only strengthened wound, and increased the contact area of blood and foreign body, be unfavorable for preventing thrombosis to human body.Also have the minisize axial-flow blood pump directly by the apex otch; passing ventricle wall muscle is implanted in the ventricular chamber; pump intake directly is opened on drain blood in the left ventricular cavity; thereby saved the pump intake pipeline; reduce to form negative pressuren zone in the also evitable flow ipe of contact surface of blood and foreign body; help blood conservation; as: " Jarvik 2000 " (WestabyS. of the U.S.; Katsumata, T., Evans; R.; et al.The Jarvik 2000 Oxford system:increasing thescope of mechanical circulatory support.J.Thorac.Cardiovasc.Surg., 1997,114:467).The construction features of Jarvik 2000 axial blood pumps is: the rotational component with being arranged on the preceding stator elimination inlet blood flow of arrival end in the pump line, support the impeller shaft front end simultaneously.The tail end that will be arranged on the cylindrical pump housing with the implant sewing skirt that myocardium of apex of heart is sewed up is to guarantee that the pump housing all is implanted in the ventricular chamber.From the implantation mode, Jarvik 2000 axial-flow pumps have dissects the compatibility preferably.But,, make long-term existence foreign body in the ventricular chamber because this kind method is all implanted the pump housing in the left ventricular cavity, in around the ventricular chamber of the pump housing, form the slow district of blood flow easily, produce non-physiology blood flows such as eddy current, be unfavorable for washing away in the ventricular chamber, increased in the thrombotic danger of arrival end.

Summary of the invention

This utility model produces the shortcoming of thrombosis easily in the porch at present all kinds of axial-flow pumps, with stitching skirt around pump housing middle part, restriction is implanted the pump housing and is not stretched in the chambers of the heart, and pump intake is communicated with ventricular chamber, and the rotating screw blood flow that the porch is kept can be strengthened washing away of ventricular chamber.

The technical scheme that its technical problem that solves this utility model adopts is: " micro axial flow pump in the apex of the heart locular wall ", the stator of pump intake end is not set, support impeller rotary body front end axle with single front boom, make the inlet blood flow keep rotational component, to strengthen washing away ventricular chamber.The restriction pump housing does not stretch in the chambers of the heart when implanting around the stitching skirt at pump housing middle part, only the part pump housing is implanted to the ventricle wall intramuscular of the apex of the heart, both avoid axial-flow pump to be positioned at the chambers of the heart and increased foreign body in cardiac chamber, disturb the shortcoming of blood flow in the ventricle, pump intake is directly communicated with ventricular chamber, need not inlet duct; This utility model produces the shortcoming of thrombosis easily in the porch at present all kinds of axial-flow pumps, when improving entrance structure, consider behind the implant into body quality with the combinative structure of natural cardiac cycle system, major advantage can only be under specific implantation mode competence exertion, therefore, must use around the stitching skirt at pump housing middle part, restriction is implanted the pump housing and is not stretched in the chambers of the heart, pump intake is communicated with ventricular chamber, and the rotating screw blood flow that the porch is kept can be strengthened washing away of ventricular chamber.

The beneficial effects of the utility model are: implant the pump housing and do not stretch in the chambers of the heart, making does not have foreign body to retain in the ventricular chamber, pump intake is communicated with ventricular chamber, and the blood flow rotational component that pump intake and ventricular chamber junction are kept can fully be washed away ventricular chamber.Remove inlet duct, reduced blood and foreign body contact surface, helped preventing thrombosis.

Description of drawings

Fig. 1 is the fundamental diagram of this utility model when being implanted in the apex of the heart ventricle wall.

Fig. 2 is the vertical section structural map of first embodiment of micro axial flow pump in the apex of the heart locular wall.

Among the figure: 1. pump line enters the mouth, 2. locular wall muscle and pump case contact surface, 3. front slide axle sleeve, 4. micro axial flow pump front end in the apex of the heart locular wall is 5. sewed up skirt, 6. micro axial flow pump back segment in the apex of the heart locular wall, 7. the pump line port of export, 8. front boom, 9. tail stator, 10. sliding shaft sleeve after, 11. silicon steel sheet stator tubes, 12. embedding groove posterior lips, 13. the embedding groove anterior lip, 14. impellers, 15. rotors, 16. enamel-covered wire winding, 17. the tubular stator casing, 18. impeller rotary body rotating shafts, 19. rear end caps, 20. impeller central hub, 21. tail stator wheel hub, 22. cartridge type pump lines, 23. sew up the skirt embedding groove, 24. artificial blood vessel, 25. descending aortas.

The specific embodiment

Below in conjunction with drawings and Examples this utility model is further specified.

Micro axial flow pump is cylindric in the apex of the heart locular wall, as seen Fig. 1 only is implanted to micro axial flow pump leading portion 6 the ventricle wall intramuscular of the apex of the heart, locular wall muscle is closely contacted with pump case contact surface 2, pump line inlet 1 directly communicates with ventricular chamber, sew up skirt 5 and sew up with apex muscle, the artificial blood vessel 24 that connects by the pump line port of export 7 is connected with descending aorta 25.

The visible pump housing outer wall of Fig. 2 is made by medical stainless steel or titanium alloy that histocompatibility is good for wrapping by the tubular stator casing 17 of motor stator.The working mechanism of pump is identical with general axial-flow pump, can be divided into the pump housing and stator two large divisions.The pump housing is by cartridge type pump line 22, rotor 15, and impeller 14, tail stator 9 and rotating shaft support system four parts are formed.The cartridge type pump line is made by the titanium alloy of thin-walled, 13 millimeters of the diameters of first embodiment, and length is 55 millimeters.Arrival end at cartridge type pump line 22 stretches out fixed front boom 8 by tube wall to the center, supports front slide axle sleeve 3 at the place, axle center of cartridge type pump line 22.Rotor, the impeller rotary body that impeller constitutes is made up of aial flow impeller 14 and rotor 15.The impeller 14 of titanium alloy is the spiral vane of one group of coiling central hub 20, and central hub 20 is a hollow structure, and cavity is used to hold rotor 15.Rotor 15 is a column type, adopts high-performance rare-earth permanent magnet material to make, and sealing is coated in the wheel hub 20 of impeller central authorities behind the radial magnetizing, forms the impeller rotation body structures jointly with titanium alloy impeller 14, and along the axis of impeller rotary body rotating shaft 18 is set.The impeller rotary body places in the cartridge type pump line 22, and rotating shaft pro-sliding bearing sleeve 3 is free to rotate under the support of back sliding bearing sleeve 10.The port of export in the cartridge type pump line 22 is provided with tail stator 9.Tail stator 9 is the spiral vane of another group coiling tail stator wheel hub 21, and vane tip closely contacts with cartridge type pump line 22 inwalls whole tail stator 9 is fixed.The blade screw direction and the impeller rotary body blade of tail stator 9 are reverse, so that the rotational component of outlet blood flow is changed into axial flow, raise the efficiency.Tail stator 9 wheel hub centers contain back sliding shaft sleeve 10 to support impeller rotary body shaft rear end, with the front slide axle sleeve 3 common rotating shaft support systems of forming of front boom 8.Impeller rotation axon with before, the rear axle housing socket is with sliding mechanism contact rotation.Stator builds up stator tube 11 by annular silicon steel sheet, around cartridge type pump line 22 outer walls.In the outer wall of cartridge type pump line 22 and the space between stator tube 11 inwalls, inlay when " drag cup " formula three-phase enamel-covered wire winding 16, three phase windings 16 orders are switched on and to produce and the concentric rotating excitation field of pump line, promote the rotation of impeller rotary body.Stator tube 11 outer walls closely wrap the outer wall welding of carrying on the back and passing through rear end cap 19 and pump line 22 by the tubular stator casing 17 of thin-walled, and silicon steel sheet stator and winding are sealed fully, reach the purpose that prevents the liquid infiltration.There is annular stitching skirt embedding groove 23 that the pump housing is divided into leading portion leading portion 4 and back segment 6 on the pump housing outer wall that stator casing 17 constitutes.Ring-type embedding groove anterior lip 13 and posterior lip 12 by projection are formed.The embedding groove anterior lip of first embodiment and posterior lip spacing are 2 millimeters, can be in embedding groove the stitching skirt 5 of colligation braiding.To sew up skirt 5 ring-types during implantation is seamed in the apical myocardium outer surface and can reaches the fixedly purpose of blood pump.

Claims

1. micro axial flow pump in the apex of the heart locular wall, pump line, impeller rotary body, tail stator and rotating shaft support system by stator, cartridge type are formed, and the cartridge type pump line is made by the titanium alloy of thin-walled, and the impeller rotary body places in the cartridge type pump line, the rotating shaft pro-, free to rotate under the support of back sliding bearing sleeve; The port of export in the cartridge type pump line is provided with the tail stator; Tail stator wheel hub center contains the back sliding shaft sleeve to support the impeller shaft rear end, forms the rotating shaft support system jointly with the front slide axle sleeve of front boom; P-m rotor places interior impeller rotary body wheel hub; Stator builds up stator tube by annular silicon steel sheet, around the pump line outer wall; In the outer wall of pump line and the space between the stator tube inwall, inlay the enamel-covered wire winding; Stator casing constitutes pump housing outer wall; It is characterized in that: at cartridge type pump line arrival end preceding stator is not set, stretches out fixed front boom to the center, support the front slide axle sleeve at the place, axle center of pump line by the pump line wall; There is annular stitching skirt embedding groove at the pump housing outer wall middle part that stator casing constitutes, is made up of the ring-type embedding groove anterior lip and the posterior lip of projection; Skirt is sewed up in the colligation braiding in the pro-, the embedding groove that forms between posterior lip, and the pump housing is divided into pump housing leading portion and pump housing back segment two parts, with the intramuscular of pump housing leading portion heeling-in at apex of the heart locular wall, sews up the hoop shape and is seamed in fixedly blood pump of myocardium outer surface during implantation; Sew up the skirt restriction pump housing, pump housing leading portion is excessively stretched in the ventricular chamber.

2. micro axial flow pump in the apex of the heart locular wall according to claim 1 is characterized in that, does not have guide vane at the arrival end of cartridge type pump line, and what support front shaft sleeve is a cantilever structure that stretches out from tube wall, and front boom supports the front slide axle sleeve at the place, axle center of pump line.

3. micro axial flow pump in the apex of the heart locular wall according to claim 1 is characterized in that cartridge type pump line arrival end is not provided with preceding stator, keeps the rotational component of inlet blood flow.

4. micro axial flow pump in the apex of the heart locular wall according to claim 1 is characterized in that, stator casing constitutes pump housing outer wall; There is annular stitching skirt embedding groove at pump housing outer wall middle part, is made up of the ring-type embedding groove anterior lip and the posterior lip of projection, and skirt is sewed up in the colligation braiding in the pro-, the embedding groove that forms between posterior lip.

5. micro axial flow pump in the apex of the heart locular wall according to claim 1 is characterized in that, skirt is sewed up in the colligation braiding in the embedding groove at pump housing outer wall middle part, is seamed in fixedly blood pump of myocardium outer surface when being used to implant.

6. micro axial flow pump in the apex of the heart locular wall according to claim 1, it is characterized in that, colligation is divided into pump housing leading portion and pump housing back segment at the stitching skirt at pump housing outer wall middle part with the pump housing, and the heeling-in of pump housing leading portion is sewed up skirt restriction pump housing leading portion and do not stretched in the chambers of the heart at the intramuscular of the apex of the heart locular wall during implantation.

7. micro axial flow pump in the apex of the heart locular wall according to claim 1, it is characterized in that, the cartridge type pump line is made by the titanium alloy of thin-walled, stator builds up stator tube by annular silicon steel sheet, around the pump line outer wall, in the outer wall of pump line and the space between the stator tube inwall, inlay hollow cup type three-phase enamel-covered wire winding.