A kind of heat sink of implantable cardiac auxiliary blood pumpTechnical field
The present invention relates to a kind of medicine equipment, specifically a kind of heat sink of implantable cardiac auxiliary blood pump.
Background technology
Heart failure（Heart failure）It is a kind of disease of serious threat human health.For the maximally effective treatment side of advanced heart failureMethod is heart transplant and artificial heart auxiliary treatment.Because heart transplant donors extremely shortage can not much meet heart failure treatmentNeed, market is continuously increased for the demand of artificial heart, thus the research of artificial heart turns into focus.A variety of artificial heart quiltsFind out.Such as the implantable axial flow type blood pump that patent CN104707194A is supported based on blood flow dynamic pressure and Pivot, using built-inCoil produces alternating magnetic field driving wheel rotation as stator.Patent CN104436338A uses to be made from suspension from suspension technologyAxial flow blood pump, avoid blood damage.Similar, patent CN102247628B embedded type magnetic liquid suspension type centrifugal blood pumps, the hairIt is bright to be suspended and permanent magnet suspension combination technique using dynamic pressure liquid, conventional contact mechanical bearing is instead of, is not had between rotor and statorThere is Mechanical Contact, mechanical wear will not be produced, reduce the effect of rolling to haemocyte, thrombus and haemolysis to greatest extentCan effectively it mitigate.Although current a variety of artificial hearts are devised, the temperature rise of artificial heart is still a limitationThe serious problems of its prolonged application.The reason for causing artificial heart to produce temperature rise is to produce alternating magnetic field by the use of coil to be used as powerDrive wheel rotation.It is artificial so as to cause and the resistance of coil in itself can cause portion of energy to be distributed in the form of heatThe temperature of heart rises, and in turn results in surrounding tissue and produces fire damage.
The content of the invention
It is an object of the invention to provide one kind can reduce temperature rise, make implanted blood pump implant after its temperature rise completely in peopleThe heat sink of assistant blood pump for heart within body physiological range.
The present invention includes pumping system and drive system, and pumping system has blood pump and pump case, and drive system has stator and rotor, alsoFormed including heat orientation conducting parts with vacuum heat-insulation part, heat orientation conducting parts are located at the periphery of blood pump stator, veryEmpty heat insulating member is located in blood pump pump case.Wherein heat orientation caused by blood pump stator is imported blood by heat orientation conducting partsLiquid；Vacuum heat-insulation part reduces heat to external radiation, reduces blood pump surface temperature rise, avoids causing fire damage to tissue.
Above-mentioned heat orientation conducting parts are made up of lattice-shaped structure, and grid shape can be triangle, quadrangle(or other geometries).
Above-mentioned grid is made up of the high material of thermal conductivity.
The high material of above-mentioned thermal conductivity is graphene or CNT or silver etc..
Above-mentioned vacuum heat-insulation part is by one layer, two layers or more stratiform structure compositions, each layer are low by thermal conductivityMetal or nonmetallic composition, are evacuated using pumping process between layers.
The low metal of above-mentioned thermal conductivity can be titanium alloy or stainless steel.
Above-mentioned blood pump can be axial-flow pump or centrifugal pump.
The present invention has the following advantages compared with prior art：
Heat conduction caused by stator can be entered blood by the present invention rapidly, so as to reduce laundry temperature, reduction heat toExternal radiation.Simultaneously as the specific heat capacity of blood is very big, and body surface heat sinking function is very powerful, therefore the heat is notBlood heat can be caused to increase.Vacuum heat-insulation part stratiform structure composition by one layer, two layers or more, each layer is by titanium alloyOr the low metal of the thermal conductivity such as stainless steel or nonmetallic composition, it is evacuated between layers using pumping process, to reduce heatMeasure to external radiation.The effective temperature rise problem for solving intercorporeal artificial heart-ventricle auxiliary system, plants implanted blood pumpIts temperature rise is completely within the scope of Human Physiology after entering in vivo.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is the structural representation that the present invention is used for axial-flow pump.
Fig. 2 is the cross-sectional view that the present invention is used for centrifugal pump.
Fig. 3 is the facade structures schematic diagram that the present invention is used for centrifugal pump.
In figure：1. pump barrel, 2. axles, 3. orientation heat conduction grid A, B, 4. impellers, 5. tail stators, 6. pump discharges, 7. are pumped intoMouthful, 8. axle sleeves, 9. pump cases, 10. coils I, 11. stator silicon steel sheets, 12. impeller blades, 13. vacuum heat-insulating layers, 14. radiation shells（Stator case）, 15. centrifugal pump housings, 16. centrifugal pump inner casings, 17. centrifugal pump impellers, 18. pump shafts, 19. outlet of centrifugal pump,20. the magnet in impeller, 21. coils II, 22. small orientation heat conduction grid A, B, C, D, 23. centrifugal pump inlets, in 24. pump shaftsMagnetic patch.
Embodiment
Embodiment one
" pump-machine assembly " that heat sink as shown in Figure 1 is made up of pumping system and motor system two large divisions, pumpSystem is axial-flow pump system, including pump barrel 1, pump discharge 6, pump intake 7, axle 2, the axle sleeve of pump case 9 and the installation in pump barrel8th, impeller 4, impeller blade 12, tail stator 5；Motor system includes stator：Silicon steel sheet 11 and coil I 10, rotor：Impeller；Silicon steel sheet 11 is arranged on the periphery of pump barrel 1, and coil I 10 is arranged on silicon steel sheet 11, and stator peripheral has radiation shell 14；Heat orientation passesLead the periphery that part is located at blood pump radiation shell 14 for orientation heat conduction grid 3A, 3B.3A is wider than 3B, is to increase orientation heat conduction gridContact area between lattice 3A and pump barrel 1, heat caused by stator is transmitted to pump barrel 1 as soon as possible and pass through the blood that quickly flowsTake away.Vacuum heat-insulation part is vacuum heat-insulating layer 13, between the outside in blood pump shell with orienting heat conduction grid 3A, 3B.Wherein heat orientation conducting parts are used to heat orientation conduction caused by stator entering blood, reduce the accumulation of blood pump heat；VeryEmpty heat insulating member is used to prevent heat from reducing blood pump outer surface temperature rise to external radiation, avoid causing fire damage to surrounding tissue.
Above-mentioned orientation heat conduction grid can be triangle, quadrangle or other geometries.
Above-mentioned orientation heat conduction grid is made up of the high material of thermal conductivity.
The high material of above-mentioned thermal conductivity is graphene or CNT or silver etc..
Above-mentioned vacuum heat-insulation part is by one layer, two layers or more stratiform structure compositions, each layer are low by thermal conductivityMetal or nonmetallic composition, are evacuated using pumping process between layers.
The low metal of above-mentioned thermal conductivity can be titanium alloy or stainless steel.
Embodiment two
As shown in Figures 2 and 3, " the pump-machine combination that heat sink is made up of pumping system and motor system two large divisionsBody ", pumping system are centrifugal pump system, including centrifugal pump housing 15, centrifugal pump inner casing 16, centrifugal pump impeller 17, pump shaft 18, centrifugationMagnetic patch 24 in magnet 20, centrifugal pump inlet 23, pump shaft in pump discharge 19, impeller；Motor system includes stator：Coil II21st, rotor：Pump shaft 18 and centrifugal pump impeller 17；Heat orientation conducting parts are orientation heat conduction grid 22, positioned at blood pump stator：LineEnclose II 21 periphery, respectively 22A, 22B, 22C, 22D face.Heat is by orienting heat conduction caused by one group of coil located above22A, 22D face of grid are transmitted to 22B, 22C face contacted with blood flow and taken away by the blood quickly flowed as soon as possible.Under being located atHeat caused by one group of coil II 21 in face is transmitted to by orienting 22A, 22C, 22D face of heat conduction grid and connect with blood flow as soon as possibleTaken away by the blood quickly gone out in tactile 22B faces.Wherein heat orientation conducting parts are used to pass heat orientation caused by coilLead and enter blood, reduce the accumulation of blood pump heat；It is vacuum heat-insulation part 13 between centrifugal pump inner casing 16 and centrifugal pump housing 15, veryEmpty heat insulating member 13 is used to prevent heat from reducing blood pump outer surface temperature rise to external radiation, avoid causing fire damage to surrounding tissue.Remaining is the same as example one.
It is found through experiments that, the outer surface temperature rise of artificial heart blood pump is reduced to 0.2 DEG C by 3 DEG C.Here it is the artificial heartCooling overall process of the heat sink of dirty-ventricle auxiliary system in axial-flow pump and centrifugal pump.