CN1483939A - Separated axial flow pump - Google Patents

Separated axial flow pump Download PDF

Info

Publication number
CN1483939A
CN1483939A CNA031420745A CN03142074A CN1483939A CN 1483939 A CN1483939 A CN 1483939A CN A031420745 A CNA031420745 A CN A031420745A CN 03142074 A CN03142074 A CN 03142074A CN 1483939 A CN1483939 A CN 1483939A
Authority
CN
China
Prior art keywords
magnet
pump
impeller
flow pump
pump housing
Prior art date
Application number
CNA031420745A
Other languages
Chinese (zh)
Other versions
CN1260477C (en
Inventor
丁文祥
俞晓青
王伟
Original Assignee
上海第二医科大学附属新华医院
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 上海第二医科大学附属新华医院 filed Critical 上海第二医科大学附属新华医院
Priority to CN 03142074 priority Critical patent/CN1260477C/en
Publication of CN1483939A publication Critical patent/CN1483939A/en
Application granted granted Critical
Publication of CN1260477C publication Critical patent/CN1260477C/en

Links

Abstract

The present ivnention relates to a separated axial flow pump suitable for internal circulation application of infantile operation. Said axial flow pump includes driving device and pump body, said pump body is equipped with inlet end, outlet end, internal magnet and blade wheel. The described inlet end, outlet end, internal magnet and blade wheel. The described inlet end, outlet end and blade wheel of the pump body are positioned on same central axis, and pump body can be separated and axially mounted on the central axis of the driving device, the blade wheel is fixed in the internal magnet, and the interior of driving device is equipped with a transmission device, it includes an external magnet which can be coupled with said internal maget by means of magnetic force to drive blade wheel and make it rotate.

Description

A kind of detachable axial-flow pump

Technical field

The present invention is about a kind of medical pump, especially a kind ofly is adapted at the detachable axial-flow pump that young baby performs the operation and uses in the extracorporal circulatory system.

Background technique

Along with improving constantly of surgical technic and carrying out in a deep going way of each side research, the notion that congenital heart disease should be treated as early as possible to prevent various secondary affections forms gradually.Patient's age of operation constantly descends, and more and more the patient of cradle and even neonatal period operation, this also has higher requirement to the cardiopulmonary bypass technology, needs more advanced, as to be more suitable for young baby's turn of tidal stream equipment.

The equipment of general cardiopulmonary bypass mainly is medical pump and oxygenator.Children baby cardiopulmonary bypass requires the equipment of its use to have following characteristics: 1. low priming volume.The equipment of prior art is young baby, particularly the priming volume in neonate's turn of tidal stream often is equivalent to even greater than infant whole body blood volume, not only is easy to cause infant postoperative tissue edema, and increases the consumption of blood product, and present blood product supply deficiency, and there is pathophorous possibility.This just requires extracorporal circulatory system to use the pump and the oxygenator of small volume, and these equipment preferably can install flexibly, to shorten circulating line.2. blood destroys few.Every function of children baby body is not grown perfect as yet, and neonate's renal function is half for being grown up only, and too much blood destruction can cause the fatal kidney function damage of its postoperative, influences prognosis.3. can meticulous adjusting flow, young infant weight is low, the metabolic rate height, and also tissue space is loose, and requiring in the turn of tidal stream process has suitable flow perfusion whole body internal organs.Too high flow can cause liquid holdup, and low excessively flow then can cause acidosic generation, and therefore meticulous Flow-rate adjustment is that young baby performs the operation with the requisite characteristic of pump.

According to the working principle of medical pump, roughly can be divided into two big classes, positive displacement pump and vane type oil pump, the former comprises rotary type and reciprocating pump, and the latter mainly contains centrifugal pump, axial-flow pump and mixed flow pump.The medical pump of these types all has application in field of extracorporeal circulation, sees and be that roller pump and centrifugal pump comparatively in cardiopulmonary bypass more with drum pump wherein.

Roller pump is to be applied in historical the longest pump type in the extracorporal circulatory system, is resistance enclosed pump, and the change of pressure does not influence the output of its flow behind its pump, and through the clinical practice of nearly half a century, its Security and stability gain public acceptance.But because itself following shortcoming makes it not be adapted at using in neonate, the young infants outer circulation: 1. very flexible, it generally is installed on the base, can not move, and needs the longer pipe road to connect, and priming volume is big.2. blood destruction is heavier, because its squeezing action not only has certain damage to blood formed element, and can cause that extruded tube wall produces the chip that comes off, and is brought in the human body by blood flow, forms embolus, influences perfusion effect.3. certain danger is arranged,,, can behind pump, produce very high pressure, cause that collapsing of pump line take off, and, also a large amount of gas pumps can be advanced in the body, cause serious consequence when before the pump during blood supply deficiency in case blood flow is obstructed because it is resistance closed form pump.

Liquid in the centrifugal pump is radial motion, relies on centrifugal force to increase its pressure energy, and for example No. 98226532 Chinese patent promptly provides a kind of like this impeller type ventricle of pump machine unification to assist centrifugal pump.Centrifugal pump can be avoided some shortcomings of roller pump, but it mostly is adult's design greatly, imports and exports and is 3/8 inch pipeline, and priming volume is also bigger; And the destruction to blood is similar with roller pump when low discharge, therefore, also is not suitable for using in neonate, baby's cardiopulmonary bypass surgery.

Axial-flow pump is emerging in recent years pump type, and its structure is more compact than centrifugal pump, can reduced volume reduce priming volume; and the fluid in the axial-flow pump is axial motion; can avoid the generation of eddy current in the pump housing, reduce the suffered bump of blood corpuscle, the protection shaped components in blood.Thereby axial-flow pump mostly is applied in multiple occasions such as openheart surgery, ventricular assist device and fetus extracorporal circulatory system at present.

Axial-flow pump generally is made up of impeller and two parts of outlet guide vanes.During the impeller rotation, blood enters in the runner of being made up of blade vertically, and its energy passed to blood, blood is produced advance and rotate two kinds of motions, after blood leaves impeller, enter in the runner of guide vane, the motion of blood sense of rotation is forced to stop, rotation function is converted into pressure energy, makes blood be axial motion, but generally can not obtain pulsatile flow by axial-flow pump.Compare with roller pump, axial-flow pump is small and exquisite, and noise is low, and power consumption is few, and more economical; Compare with centrifugal pump, the blood destructiveness of axial-flow pump is lighter.

Because present blood propagation disease is subjected to people and pays close attention to widely, the preferably disposable use of medical apparatus that similar blood pump is so especially more should be like this in young baby's cardiopulmonary bypass surgery, can guarantee patient's safety.But existing blood pump and motor thereof mostly are integral type greatly or directly link with flexible axle, and this not only brings inconvenience to its disposable use, and make its disposable cost improve greatly.

Summary of the invention

The technical problem to be solved in the present invention is to overcome above-mentioned the deficiencies in the prior art, a kind of detachable axial-flow pump that uses in the extracorporal circulatory system when being adapted at young baby and performing the operation is provided, its pump housing can separatedly from the drive unit get off to change, thereby can effectively reduce disposable cost.

Technological points of the present invention is: a kind of detachable axial-flow pump is provided, comprises the drive unit and the pump housing, the pump housing is provided with entrance point, outlet end, inner magnet and impeller; The entrance point of the described pump housing, outlet end and impeller are on the same central axis, and the pump housing axially is installed on the medial axis of drive unit separably; Impeller fixedly is located in the inner magnet, establishes a transmission device in the drive unit, and it comprises and can carry out the outer magnet of magnetic force coupling with the impeller rotation with this inner magnet.

Described drive unit is a motor, and this transmission device one end is installed on the axis of motor, establishes outer magnet in the other end, and outer magnet and motor axis have same central axis.The motor axis is provided with a central channel, and the outlet end of the pump housing can stretch out in this central channel.

Inner magnet comprises second ring body, and impeller is fixed at the hollow space of ring body coaxially, and sealing is provided with an iron hoop in described second ring body, fixedly installs some magnet steel on it, and the pole-face of magnet steel is for radially being provided with.Described outer magnet comprises first ring body, and sealing is provided with an iron hoop in it, fixedly installs some magnet steel on the iron hoop, and the pole-face of each magnet steel is for radially being provided with.Second ring body of inner magnet is positioned at the hollow space of first ring body of outer magnet, and inner magnet has same central axis.Each magnet steel of each magnet steel of outer magnet and inner magnet is corresponding to be provided with, the alternate cross arrangement of its magnetic pole, and every block of magnet steel all is subjected to the interaction of three blocks of relative magnet steel, makes impeller be suspended in the center of the pump housing.

Described transmission device also comprises a cone, first ring body of outer magnet promptly is fixedly connected on the big opening end of this cone, the osculum end of this cone is fixedly connected on the axis of motor, and the central channel of first ring body of outer magnet and the hollow space of cone and motor axis is interconnected, and has same central axis.

The entry end of the pump housing is provided with one first vertebra shape body and the outer pipe that extends of the osculum end of this first vertebra shape body certainly, this first vertebra shape body and outer pipe stretch into the ring body of outer magnet and the hollow space of cone respectively, and wherein outer pipe stretches out to be connected with external infusion device from the central channel of motor axis.The ring body of inner magnet is arranged in the big opening end of this first vertebra shape body.

The central authorities of impeller are provided with the auxiliary locator that can help impeller is remained on pump housing central authorities.Described auxiliary locator comprises a support that is fixedly installed between impeller and the described outer pipe, carriage center is corresponding with the impeller center respectively establish one can be involutory hemispherical-shaped aperture, a ball bearing is set in it.With this ball bearing is reference, and the position of the magnet steel of described outer magnet is a little less than the position of the magnet steel of inner magnet.Described bearing ball is made by pottery.

The pump housing also comprises the second vertebra shape body, and its big opening end can cooperate fixing with the big opening end of the first vertebra shape body, and the entry end of the described pump housing promptly extends from the osculum end of the second vertebra shape body.

The present invention further comprises a fixing device, and it comprises some from the axially extended outer magnet of motor axis accommodation section, and this outer magnet accommodation section is provided with some tapped holes near the edge of outer magnet; The big opening end ora terminalis that the first and second vertebra shape bodies of the pump housing cooperatively interact correspondence respectively is provided with some through holes, for bolt first, second vertebra shape body of the pump housing and the outer magnet accommodation section of motor being fixedlyed connected.

First, second vertebra shape body of the present invention, first, second ring body of inner magnet, positioning ring, impeller, first ring body of outer magnet, the cone of transmission device etc. all can be made by polycarbonate (PC).

Axial-flow pump of the present invention has not adopted the method for single-point bearing, uses the hardness height, and is easy to wear and to the main structure of the nontoxic ceramic bead of blood as bearing, all polish a hemispheric hole slot in the central authorities of support and impeller, to hold ceramic bead.In rotary course, this ceramic bead also is used for fixing the position of impeller promptly as bearing, makes it not and pump housing cover attack, in order to avoid aggravation blood destroys.

The detachable axial-flow pump of the present invention adopts the structure that the motor and the pump housing can be disconnected from each other, like this can be so that motor separate fully with blood, the pump housing can adopt the technology manufacturing of molding and forming, and cost is low, and can guarantee the degree of finish of the pump housing, also avoid extra sealing configuration simultaneously.The blood conduit of the pump housing passes through from motor center, but the contact of discord motor leaves certain interval between motor axis and this pipeline, can prevent that the heat of motor from directly sending blood to, has reduced the requirement to electric machine temperature rise.Pump body structure is relatively independent of motor, and the design of runner and impeller is not limited by motor, makes design that bigger flexibility ratio be arranged, and can more effectively improve the efficient of axial-flow pump.Cocoa separate type of the present invention make the pump housing can satisfy disposable requirement, and motor can use repeatedly, has reduced the cost of clinical use.

Description of drawings

Fig. 1 is the cut-away view before the detachable axial-flow pump assembling of the present invention;

Fig. 2 is the cut-away view after the detachable axial-flow pump assembling of the present invention;

Fig. 3 is the schematic perspective view of the outer magnet of the detachable axial-flow pump of the present invention;

Fig. 4 is the inner magnet of the detachable axial-flow pump of the present invention and the schematic perspective view that impeller sets lumps together.

Illustration:

1 motor axis, 10 axis central channels, 12 outer magnet accommodation sections, 14 screws, 16 outer magnet containing spaces

2 outer magnets, 20 magnet steel, 21 iron hoops, 22 interannular grooves, 23 fixing parts, 24 cones 25

One ring body, 26 inwalls

4 pump housings, 40 second vertebra shape bodies, 41 inlet tubes, 42 second transition parts, 43 second channels

440 fixed holes, 45 first vertebra shape bodies, 46 first auxiliary sections, 44 second auxiliary sections, 460 fixed holes

47 outer pipes, 48 first transition parts, 49 first passages

5 inner magnets, 50 second ring bodies, 51 magnet steel, 52 iron hoops, 53 interannular grooves, 54 ball bearings

55 impellers, 56 blades, 560 hemispherical-shaped aperture, 58 positioning rings, 59 supports

Embodiment

Now in conjunction with specific embodiments, a kind of detachable axial-flow pump of the present invention is described in further detail.

Consult Fig. 1 and Fig. 2, the detachable axial-flow pump of the present invention comprises the drive unit (not complete diagram and label) and the pump housing 4, and the pump housing 4 is provided with entrance point (not label), outlet end (not label), inner magnet 5 and impeller 55.The entrance point of the described pump housing 4, outlet end and impeller 55 are on the same central axis, and the pump housing 4 axially is installed on the medial axis of drive unit separably; Impeller 55 fixedly is located in the inner magnet 5, establishes a transmission device (not label) in the drive unit, and it comprises and can carry out the outer magnet 2 of magnetic force coupling with impeller 55 rotations with this inner magnet 5.

Wherein, the pump housing 4 comprises the first vertebra shape body 45, the second vertebra shape body 40, inner magnet 5 and impeller 55.The first vertebra shape body 45 is located at the outlet end of the pump housing 4, comprises first auxiliary section 46 that is positioned at the first vertebra shape body, 45 big opening ends, first transition part 48 and the outer pipe 47 of cone shape.First passage 49 runs through outer pipe 47, and and the hollow space of first auxiliary section 46 and first transition part 48 be communicated with.First auxiliary section 46 is and outer pipe 47 and the coaxial disk of first transition part 48 that its edge is provided with plurality of fixed hole 460, in order to fixedly connected with motor with the second vertebra shape body 40.

Second centrum 40 is located at the entrance point of the pump housing 4, comprises inlet tube 41, second transition part 42 and second auxiliary section 44.Wherein, second channel 43 is located in the inlet tube 41, and is communicated with the hollow space of second transition part 42 and second auxiliary section 44.Second disc of auxiliary section 44 for extending from second transition part 42, its edge is provided with the corresponding fixed hole 440 of fixed hole some and first auxiliary section 46.First and second auxiliary sections 44,46 adopt polycarbonate (PC) to make, and can abut against each other cooperation, and be undertaken fixedly connected by bolt.

Other sees also Fig. 4, and inner magnet 5 is fixed in the hollow space of first transition part 48 of the first vertebra shape body 45 and first auxiliary section 46, comprises second ring body 50.Sealing is installed with an iron hoop 52 in the interannular groove 53 of second ring body 50, fixedly installs some magnet steel 51 on it, and the pole-face of magnet steel 51 is for radially being provided with.

Impeller 55 is fixed at the hollow space of second ring body 50 coaxially, comprises some blades 56.Impeller 55 is provided with a hemispheric circular hole 560 towards the center of outer pipe 47 one sides of the first vertebra shape body 45, in order to accommodate ball bearing 54.Inner magnet 5 is provided with a positioning ring 58 near outer pipe 47 1 ends of the first vertebra shape bodies 45, is used to seal iron hoop 52 and the magnet steel 51 be located in the inner magnet 5, and can play the effect of location to the impeller 55 of the hollow space of being located at inner magnet 5.

Described drive unit is a motor (a not label), and this transmission device one end is installed on the axis 1 of motor, establishes outer magnet 2 in the other end, and outer magnet 2 has same central axis with motor axis 1.Motor axis 1 is provided with a central channel 10, and the outer pipe 47 of the pump housing 4 can stretch out in this central channel 10, to be connected with external infusion device (not icon).

As shown in Figure 3, outer magnet 2 comprises first ring body 25, fixing part 23 and cone 24.Interannular groove 22 is located on first ring body 25, and sealing is provided with an iron hoop 21 in it, fixedly installs some magnet steel 20 on the iron hoop 21, and the pole-face of each magnet steel 20 is for radially being provided with.

Second ring body 50 of second ring body, 50 inner magnets 5 of inner magnet 5 is arranged on the hollow space that is positioned at first ring body 25 of outer magnet 2 in the big opening end of this first vertebra shape body 45, and be close to the inwall 26 of first ring body 25, and inner magnet 5,2 has same central axis.Each magnet steel 51 corresponding setting of each magnet steel 20 of outer magnet 2 and inner magnet 5, the alternate cross arrangement of its magnetic pole, every block of magnet steel all is subjected to the interaction of three blocks of relative magnet steel, makes impeller 55 be suspended in the center of the pump housing 4.

Described transmission device comprises cone 24, first ring body 25 of outer magnet 2 promptly is fixedly connected on the big opening end of this cone 24, the osculum end 23 of this cone 24 is fixedly connected on the axis 1 of motor, and the hollow space of first ring body 25 and cone 24 and the central channel 10 of motor axis 1 are interconnected, and have same central axis.

The central authorities of impeller 55 are provided with the auxiliary locator (not label) that can help impeller 55 is remained on the pump housing 4 central authorities.Described auxiliary locator comprises the support 59 that is fixedly installed between impeller 55 and the described outer pipe 47, the center of support 59 is corresponding with impeller 55 centers respectively establish one can be involutory hemispherical-shaped aperture 560, a ball bearing 54 is set in it, and described bearing ball 54 is made by pottery.

Like this, structurally inner magnet 5 and impeller 55 are located at inner ring, and outer magnet 2 places the outer ring, and are reference with this ball bearing, and the position of magnet steel 20 of guaranteeing described outer magnet 2 is a little less than the position of the magnet steel 51 of inner magnet 5.So, 6 pairs of magnet steel 51,20 produce the attraction force of a balance simultaneously, can be fixed on impeller 55 firmly on the auxiliary fulcrum ball bearing 54; When interior outer magnet 5,2 rotated with motor axis 1, the motion of other direction can not appear in impeller 55, and impeller 55 is suspended on this ball bearing 54.

The present invention further comprises a fixing device (not label), and it comprises some from motor axis 1 axially extended outer magnet accommodation section 12, and the edge of this outer magnet accommodation section 12 is provided with tapped hole 14 near an end of outer magnet 2; The big opening end ora terminalis that the first and second vertebra shape bodies 45,40 of the pump housing 4 cooperatively interact correspondence respectively is provided with some through holes 460,440, for bolt (not icon) first, second vertebra shape body 45,40 of the pump housing 4 and the outer magnet accommodation section 12 of motor being fixedlyed connected.Also can some pins (not shown) be set, be provided with tapped hole near an end of outer magnet, can cooperate with the through hole 460,440 of first, second vertebra shape body 45,40 of the pump housing 4 at pin at these 12 edges, outer magnet accommodation section.

First, second vertebra shape body 45,40 of the present invention, first, second ring body 50,25 of inner magnet 5,2, positioning ring 58, impeller 55, cone 24 grades of transmission device are all made by polycarbonate (PC).

Below the working process of the detachable axial-flow pump of the present invention is carried out simple declaration:

Step 1: the motor of a quill shaft of preparation;

Step 2: prepare small one and large one two iron hoops, dig 4-8 groove in the inboard and little ring of big ring outside equal angles respectively, place magnet steel in the groove;

Step 3: prepare two annulus, small one and large one, sky is hugged on the ring limit, insert it in together with magnet steel above-mentioned two iron hoops after, seal and to obtain inner magnet;

Step 4: the impeller of a 3-6 blade of preparation, impeller center one side is dug a little hemispherical-shaped aperture, and a little ceramic ball is fixed in this hole;

Step 5: prepare first, second vertebra shape body of the pump housing as previously mentioned;

Step 6: prepare a support, it is recessed that carriage center is also dug a roundlet, and support is bonded between the outer pipe and first transition part of the first vertebra shape body;

Step 7: prepare a similar bell-mouthed cone of profile, the large circle for preparing in the step 3 is bonded in its big opening end;

Step 8: the small circle ring of step 3 gained and the impeller of step 4 preparation are bonded together;

Step 9: inner magnet that step 8 is completed and impeller are inserted the hollow space between first vertebra shape body first transition part and first auxiliary section, make recessed the coincideing of circle on ceramic ball and the support, and two shells are connected and fixed the synthetic pump housing;

Step 10: will be fixedly connected on through the small end of the cone that step 7 is made on the axis of motor;

Step 11:, and be fixed on the motor housing with the hollow space insertion motor axis of the pump housing by outer magnet and cone.

For satisfying disposable requirement, and the distance of dwindling inner magnet 5 and 2, guarantee the effect of magnetic force coupling, the present invention selects the material of polycarbonate (PC) as the pump housing for use; The ring body in the impeller outside of the pump housing is also made for polycarbonate (PC).The pitch of impeller 55 can be the suitable numerical value of 12mm or 16mm or other; The quantity of blade 56 can be made different choice according to its performance demands, such as the impeller of selecting three blades for use; The thickness of blade with to do fatigue strength relevant, also influences the efficient of family dependant's impeller with the inflow of impeller.

Available seal ring seals between first, second vertebra shape body 45,40 two-part of the pump housing 4.The pump housing 4 and two ends polycarbonate (PC) pipeline have certain priming volume.

Impeller 55 is made up of three blades 56, the inner magnet of being made up of 6 blocks of magnet steel 51 in second ring body 50 5.Impeller 55 1 side central authorities are a flow deflecting cone, and there is a hemispherical-shaped aperture 560 in the central authorities of opposite side relatively, interior edge one ceramic bead, and this ceramic bead is made by silicon nitride (Si3N4), promptly as supporting, the single-point bearing during again as impeller 55 rotations.Impeller 55 is other installs a cross-bar-shaped support 59, and support 59 is fixed in the first vertebra shape body 45, and support 59 central authorities are provided with a hemispherical-shaped aperture 56, holding ceramic balls bearing 54 bonding on the impeller 55, thereby constitutes whole bearing.

Magnet steel 51,20 of the present invention uses rare earth magnetic steel, as rubidium iron boron magnet steel, adopts 6 pairs of magnet steel to make inside and outside two magnetic ring bodies.This material has advantages such as magnetic is strong, magnetic flux is constant, in installation process, for giving full play to the magnetic of every block of magnet steel, N, the S utmost point of the magnet steel 51,20 on the inner magnet 5,2 are alternate cross arrangements, every block of magnet steel is subjected to the effect of relative three blocks of magnet steel like this, produce maximum transmitting torque, coupling effect is comparatively satisfied in actual use.Magnet steel diameter 10mm, thickness 7mm.

Directly advance the condition that directly goes out in order to satisfy axial-flow pump, the pump housing need pass through drive unit central authorities, simultaneously in order to make blood not contact drive unit, therefore opens a central channel on the motor axis.Select for use the brushless type direct current generator as drive unit, it is made up of armature, permanent magnet etc., has cancelled brush and phase changer structure, is increased in Hall subassembly simultaneously and carries out the electronics commutation.The field drives axis that produces by the periphery coil rotates, and at the pipeline of axis opening slot by 3/8 inch of internal diameter.Rotating speed require under load condition, can to reach 0-6000 rev/min continuous adjustable.

The motor external form is cylindrical, adopts stainless steel to make shell and axis, and axis stretches out at motor one end.

External D.C. regulated power supply and arrangements for speed regulation; Motor internal uses two pairs of magnetic poles, cold-reduced silicon sheet winding with 6 grooves, to be that three-phase is star-like be connected in series the mode of coil winding, use the Mageneto-sensitive type position transducer, the commutation of Hall subassembly control staor winding, by changing the commutation order modification axis sense of rotation of staor winding, reach the effect of motor bidirectional movement.Rated power 80W, operating voltage 24V, electric current<4A, away from idle maximum is 8150 rev/mins, and load speed is because of the difference of impeller difference to some extent, when using pitch as the impeller of 16mm, maximum speed is 6820 rev/mins, and during the impeller of 12mm pitch, maximum speed is 7040 rev/mins.

Transmission device divides two-part, and a part plays gearing, is used to realize the coupling of inner magnet 5,2, and another part plays the fixedly pump housing.Its outward appearance is toroidal, and the other end is also formed outer magnet by 6 blocks of magnet steel in the ring ringwise, and is corresponding one by one with the inner magnet in the impeller outer shroud.During motor rotation, axis 1 drives outer magnet 2 rotations, and then makes inner magnet 5 and impeller 55 rotations, produces the thrust to liquid in the pump.

The detachable axial-flow pump of the present invention adopts the structure that the motor and the pump housing can be disconnected from each other, like this can be so that motor separate fully with blood, the pump housing can adopt the technology manufacturing of molding and forming, and cost is low, and can guarantee the degree of finish of the pump housing, also avoid extra sealing configuration simultaneously.The blood conduit of the pump housing 4 passes through from the center of motor, but the contact of discord motor leaves certain interval between motor axis 1 and this pipeline, can prevent that the heat of motor from directly sending blood to, has reduced the requirement to electric machine temperature rise.Pump body structure is relatively independent of motor, and the design of runner and impeller is not limited by motor, makes design that bigger flexibility ratio be arranged, and can more effectively improve the efficient of axial-flow pump.Detachable structure of the present invention make the pump housing can satisfy disposable requirement, and motor can use repeatedly, has reduced the cost of clinical use.

Axial-flow pump of the present invention adopts the design of single-point bearing, with hardness height, not easy to wear and to the main structure of the nontoxic ceramic ball 54 of blood as bearing; Central authorities at support 59 and impeller 55 are provided with a hemispherical-shaped aperture 560 respectively, to hold ceramic ball 54 jointly.In impeller 55 rotary courses, this ceramic ball 54 also is used for fixing the position of impeller 55 promptly as bearing, make it not with the i.e. first vertebra shape body, 45 collisions of pump housing shell, thus the destruction of being avoided aggravating blood.

Claims (18)

1, a kind of detachable axial-flow pump comprises the drive unit and the pump housing, and the pump housing is provided with entrance point, outlet end and impeller; It is characterized in that: the entrance point of the described pump housing, outlet end and impeller are on the same central axis, the pump housing axially is installed on the medial axis of drive unit separably, this pump housing is provided with inner magnet, impeller fixedly is located in the inner magnet, establish a transmission device in the drive unit, it comprises and can carry out the outer magnet of magnetic force coupling with the impeller rotation with this inner magnet.
2, detachable axial-flow pump as claimed in claim 1 is characterized in that: described drive unit is a motor, and this transmission device one end is installed on the axis of motor, establishes outer magnet in the other end, and this outer magnet and motor axis have same central axis.
3, detachable axial-flow pump as claimed in claim 2 is characterized in that: the motor axis is provided with a central channel, and the outlet end of the pump housing can stretch out in this central channel.
4, detachable axial-flow pump as claimed in claim 3, it is characterized in that: inner magnet comprises second ring body, impeller is fixed at the hollow space of second ring body coaxially.
5, detachable axial-flow pump as claimed in claim 4 is characterized in that: sealing is provided with an iron hoop in described second ring body, fixedly installs some magnet steel on it, and the pole-face of magnet steel is for radially being provided with.
6, detachable axial-flow pump as claimed in claim 5, it is characterized in that: described outer magnet comprises first ring body, and sealing is provided with an iron hoop in it, fixedly installs some magnet steel on the iron hoop, and the pole-face of each magnet steel is for radially being provided with.
7, detachable axial-flow pump as claimed in claim 6 is characterized in that: second ring body of inner magnet is positioned at the hollow space of first ring body of outer magnet, and inner magnet has same central axis.
8, detachable axial-flow pump as claimed in claim 7, it is characterized in that: each magnet steel of each magnet steel of outer magnet and inner magnet is corresponding to be provided with, the alternate cross arrangement of its magnetic pole, every block of magnet steel all is subjected to the interaction of three blocks of relative magnet steel, makes impeller be suspended in the center of the pump housing.
9, detachable axial-flow pump as claimed in claim 8, it is characterized in that: described transmission device also comprises a cone, the ring body of outer magnet promptly is fixedly connected on the big opening end of this cone, the osculum end of this cone is fixedly connected on the axis of motor, and the central channel of the hollow space of first, second ring body and cone and motor axis is interconnected, and has same central axis.
10, detachable axial-flow pump as claimed in claim 9, it is characterized in that: the entry end of the pump housing is provided with one first vertebra shape body and the outer pipe that extends of the osculum end of this first vertebra shape body certainly, this first vertebra shape body and outer pipe stretch into the ring body of outer magnet and the hollow space of cone respectively, and wherein outer pipe stretches out to be connected with external infusion device from the central channel of motor axis.
11, detachable axial-flow pump as claimed in claim 10 is characterized in that: the ring body of inner magnet is placed in the big opening end of this first vertebra shape body.
12, detachable axial-flow pump as claimed in claim 11, it is characterized in that: the central authorities of impeller are provided with the auxiliary locator that can help impeller is remained on pump housing central authorities.
13, detachable axial-flow pump as claimed in claim 12, it is characterized in that: described auxiliary locator comprises a support that is fixedly installed between impeller and the described outer pipe, carriage center is corresponding with the impeller center respectively establish one can be involutory the hemisphere hole slot, a ball bearing is set in it.
14, detachable axial-flow pump as claimed in claim 13 is characterized in that: with this ball bearing is reference, and the position of the magnet steel of described outer magnet is a little less than the position of the magnet steel of inner magnet.
15, detachable axial-flow pump as claimed in claim 14, it is characterized in that: described bearing ball is made by pottery.
16, detachable axial-flow pump as claimed in claim 15 is characterized in that: the pump housing also comprises the second vertebra shape body, and its big opening end can cooperate fixing with the big opening end of the first vertebra shape body, and the entry end of the described pump housing promptly extends from the osculum end of the second vertebra shape body.
17, detachable axial-flow pump as claimed in claim 16, it is characterized in that: further comprise a fixing device, it comprises some from the axially extended outer magnet of motor axis accommodation section, and this outer magnet accommodation section is provided with some tapped holes near the edge of outer magnet; The big opening end ora terminalis that the first and second vertebra shape bodies of the pump housing cooperatively interact correspondence respectively is provided with some through holes, for the usefulness of being fixedlyed connected in the outer magnet accommodation section of first, second vertebra shape body of the pump housing and motor with bolt.
18, detachable axial-flow pump as claimed in claim 1, it is characterized in that: the described pump housing is made by polycarbonate (PC).
CN 03142074 2003-08-06 2003-08-06 Separated axial flow pump CN1260477C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 03142074 CN1260477C (en) 2003-08-06 2003-08-06 Separated axial flow pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 03142074 CN1260477C (en) 2003-08-06 2003-08-06 Separated axial flow pump

Publications (2)

Publication Number Publication Date
CN1483939A true CN1483939A (en) 2004-03-24
CN1260477C CN1260477C (en) 2006-06-21

Family

ID=34155595

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 03142074 CN1260477C (en) 2003-08-06 2003-08-06 Separated axial flow pump

Country Status (1)

Country Link
CN (1) CN1260477C (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014019274A1 (en) * 2012-08-03 2014-02-06 上海交通大学医学院附属上海儿童医学中心 Single-fulcrum magnetomotive centrifugal blood pump
CN104436338A (en) * 2013-09-17 2015-03-25 上海市东方医院 Implantable self-suspension axial-flow blood pump
WO2015127846A1 (en) * 2014-02-28 2015-09-03 浙江创美机电有限公司 High speed axial flow pump
CN111249551A (en) * 2020-01-21 2020-06-09 深圳汉诺医疗科技有限公司 Worm type pump head for artificial heart, artificial heart pump and ECMO equipment

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014019274A1 (en) * 2012-08-03 2014-02-06 上海交通大学医学院附属上海儿童医学中心 Single-fulcrum magnetomotive centrifugal blood pump
CN104436338A (en) * 2013-09-17 2015-03-25 上海市东方医院 Implantable self-suspension axial-flow blood pump
WO2015127846A1 (en) * 2014-02-28 2015-09-03 浙江创美机电有限公司 High speed axial flow pump
CN111249551A (en) * 2020-01-21 2020-06-09 深圳汉诺医疗科技有限公司 Worm type pump head for artificial heart, artificial heart pump and ECMO equipment
CN111249551B (en) * 2020-01-21 2020-11-24 深圳汉诺医疗创新技术有限公司 Worm type pump head for artificial heart, artificial heart pump and ECMO equipment

Also Published As

Publication number Publication date
CN1260477C (en) 2006-06-21

Similar Documents

Publication Publication Date Title
US10251985B2 (en) Axial flow pump with multi-grooved rotor
US10500321B2 (en) Implantable blood pump
US10835652B2 (en) Magnetically-levitated blood pump with optimization method enabling miniaturization
US10731652B2 (en) Hydrodynamic thrust bearings for rotary blood pump
US10232099B2 (en) Blood pump
US10568998B2 (en) High efficiency blood pump
US9050405B2 (en) Stabilizing drive for contactless rotary blood pump impeller
JP6009421B2 (en) Centrifugal rotary blood pump
US5591404A (en) Integrated low priming volume centrifugal pump and membrane oxygenator
JP3012308B2 (en) Disposable pump action unit
US6074180A (en) Hybrid magnetically suspended and rotated centrifugal pumping apparatus and method
US3970408A (en) Apparatus for use with delicate fluids
CN1196866C (en) Hydraulic seal for rotary pumps
JP5653932B2 (en) Centrifugal pump with offset volute
EP0810374B1 (en) Centrifugal fluid pump assembly
US10159773B2 (en) Blood pump
US3957389A (en) Pumping apparatus and process characterized by gentle operation
CN1293310C (en) Device for axially conveying fluids
EP0901797B1 (en) Sealless rotary blood pump
US5205721A (en) Split stator for motor/blood pump
JP4648602B2 (en) Viscous resistance impeller elements incorporated in pumps, turbines and transmissions
US5112200A (en) Hydrodynamically suspended rotor axial flow blood pump
US5658136A (en) Centrifugal blood pump
CA2533252C (en) Electric fluid pump
US6176848B1 (en) Intravascular blood pump

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
C14 Grant of patent or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20060621

Termination date: 20100806

C17 Cessation of patent right