CN209048760U - A kind of aorta extracorporeal counterpulsation ventricular failure auxiliary device - Google Patents
A kind of aorta extracorporeal counterpulsation ventricular failure auxiliary device Download PDFInfo
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Abstract
The utility model provides a kind of aorta extracorporeal counterpulsation ventricular failure auxiliary device, the auxiliary device not with contacting blood, in vivo without wound；By accurate pulsating synchronously control, meet blood of human body flowing law；And easy implantation small in size, patient is movable and longer-term uses.It specifically includes: the counter-pulsation device being mounted on outside aorta, two synchronous electrode, power supply, control device and synchronizing devices being fixed on heart exterior.Wherein counter-pulsation device assists artery to be shunk by the change and recovery of the generation shape under different size electric current bring temperature change.Synchronizing device heart contraction/diastole identification point in electrocardiosignal and pulse signal for identification, then exports trigger signal to control device；After control device receives trigger signal, the size for the driving current that control power supply is exported to counter-pulsation device carries out pulsating control to counter-pulsation device, makes counter-pulsation device at the time of ventricular diastole or contraction, synchronous to execute contraction or diastolic action.
Description
Technical field
The utility model relates to a kind of medical instruments for treating ventricular failure, and in particular to a kind of aorta extracorporeal counterpulsation ventricle
Failure auxiliary device, belongs to medical instruments field.
Background technique
Heart-assist device (VADs) reduces myocardial oxygen consumption, inhibits remodeling ventricle, increase hat by maintaining Efficient Cycle
Arteries and veins perfusion, promotes cardiac muscle to restore, to achieve the purpose that save patient vitals.Currently, severe acute heart failure, openheart surgery
After cannot be detached from cardiopulmonary bypass unit and waiting for heart transplantation and heart disease at final stage people is more and more, be badly in need of the short-term mistake of heart assistance
Cross or maintain the long period to wait the long-term auxiliary of heart donor transplanting.It is therefore desirable to auxiliary device not only to have it is good resistance to
Long property, and to have higher biocompatibility.Currently, axial flow blood pump, centrifugal blood pump and magnetcisuspension that ventricular assist device uses
Floating blood pump etc., can provide very effective circulatory support, but the mechanical valve due to being exposed in blood and artificial conduit etc., pole
It is easy to cause patient the anticoagulant either anticoagulant deficiency of excessively rear bleeding occur and forms thrombus, right heart failure etc. is fatal after Left ventricle assist
Severe complication.
It is cardiogenic to be applied to an acute myocardial infarction AMI merging for the first time from nineteen sixty-eight intra-aortic balloon pump (IABP)
Since shock patients, because its implantation is simple, safety, price is relatively low to be widely used IABP, it has also become one mature to face
Bed technique, IABP improve heart function by reducing afterload.But it in recent years, disputes on for intra-aortic balloon pump clinical application
Gradually increase so that it is newest America and Europe guide lowered to IABP acute myocardial infarction AMI merge cardiogenic shock in apply
Recommendation rank.Main reason is that finding that it has the disadvantage that in process of clinical application: the haemodynamics branch 1. provided
Hold limit, the cardiac function of stronger dependent patient itself plays a role；2. being unable to prolonged application (one due to limitation patient activity
As within 2 weeks)；3. the implantation because of IABP may occur, lead to lower limb ischemia, arterial injury, local infection and bleeding and gas
Capsule such as wears out at the complication.
Carpentier in 1993 et al. is wrapped in the latissimus dorsi on heart using galvanic current stimulation, thus accessory heart into
Row is shunk, and proposes a kind of non-blood contact-type heart assistance contraction mode.It is this directly to heart compression so that heart
The outer squash type artificial heart of the device of normal work, the referred to as heart, also referred to as direct heart-assist device.Analysis shows directly
Heart auxiliary device has reverse Reconstruction of The Function to heart.Simultaneously because not contacting directly with blood, it both can be to avoid biocompatibility
Problem, and the damage caused by human body when can reduce implantation.
Therefore, aorta extracorporeal counterpulsation device is due to the advantages of having IABP and direct heart-assist device, and is ground extensively
Study carefully.William Abraham of Ohio State Univ-Columbus USA in 2014 et al. is to a kind of novel implantable aorta extracorporeal counterpulsation
Feasibility, safety and potential effect of system (C-Pulse system, Sunshine Heart company) are assessed, as a result
Show the auxiliary device safe and feasible, improves the cardiac function and quality of life of patient.The device is by being wrapped in
Air sac cover outside aorta ascendens, to improve cardiac output, increases coronal as the diastole and contraction of heart are acute inflatable and deflatable
The perfusion of artery.But it is biggish must to carry volume when auxiliary device being caused to work using pneumatically for the driving method of the said goods
Also there is percutaneous puncture and are connected to external tracheae etc. in the case of abdomen exit initiation infection in air pump and battery.
To sum up, presently used heart-assist device can not meet non-contact with blood simultaneously, accurate same in vivo without wound
Step control, meets blood of human body flowing law, and device volume is small and the demand that can use for a long time.
Utility model content
In view of this, the present invention provides a kind of aorta extracorporeal counterpulsation ventricular failure auxiliary devices, and the auxiliary device is not
With contacting blood, in vivo without wound；By accurate pulsating synchronously control, meet blood of human body flowing law；And it is small in size
Easily implantation, patient is movable and longer-term uses.
The aorta extracorporeal counterpulsation ventricular failure auxiliary device includes: counter-pulsation device, synchronizing device, control device and electricity
Source；
The counter-pulsation device is the people that circumferential direction is wrapped on the outside of aorta ascendens, is formed by two or more shape-memory alloy wires
Work muscle；
The power supply is used to provide driving current to the counter-pulsation device；
The synchronizing device identifies that heart therein is received using the physiological signal of collected left ventricle as synchronization signal
Contracting/diastole identification point exports trigger signal to the control device after recognizing heart contraction/diastole identification point；
After the control device receives the trigger signal of synchronizing device, controls the power supply and exported to the counter-pulsation device
Driving current size, to counter-pulsation device carry out pulsating control, make counter-pulsation device at the time of ventricular diastole or contraction, together
Step is shunk or diastole aorta ascendens.
The counter-pulsation device includes: aramid fiber net, shape-memory alloy wire and insulating layer；The aramid fiber net is shape
Shape-memory alloy wire array, the shape is arranged in the side of the aramid fiber net in the installation base body of shape memory alloys silk
Memory alloy wire array is made of two or more the width directions along aramid fiber net shape-memory alloy wire arranged in parallel；?
Insulating layer is arranged in the online alloy wire array external of aramid fiber；The two sides of the shape-memory alloy wire array, which are provided with, leads
The both ends of line, every strip memory alloy wire are connected with the conducting wire at the end respectively, the conducting wires of two sides draw after with the power supply phase
Even.
Every shape-memory alloy wire is in broken line type along the circumferential direction of aramid fiber net.
The utility model has the advantages that
(1) the utility model uses direct heart assistance mode, solves human body to the row of contacting blood type cardiac devices
Different and anticoagulant problem.
(2) the artificial-muscle brake in the utility model selects NiTi system shape-memory alloy wire to constitute, broken line type row
Column mode can provide more powerful auxiliary contraction power in unit area, be wrapped in outside aorta ascendens, can be according to aorta
Size is adjusted and fixes.
(3) the utility model uses electric drive, can greatly reduce the volume of auxiliary device, the burden for alleviating patient is same
When, it also reduces various conduits and pulls possible hidden danger.Moreover, electric drive, which is also more easily realized, improves the sensitive of device
Property with accurate control.
Detailed description of the invention
Fig. 1 is the overall structure diagram of the utility model；
Fig. 2 is the control mode schematic diagram of the heart-assist device of the utility model；
Fig. 3 counter-pulsation device schematic diagram.
Relationship of the Fig. 4 between alloy wire shrinkage and aortic volume；
Fig. 5 is the duty cycle of heart-assist device.
Wherein: 1- aramid fiber net, 2- shape-memory alloy wire, 3- insulating layer, 4- conducting wire, 5- connection hook, 6- connection
Annulus, 7- counter-pulsation device, 8- electrode, 9- pulse pressure sensors
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.
Embodiment 1:
The present embodiment provides a kind of aorta extracorporeal counterpulsation ventricular failure auxiliary device based on artificial-muscle, which can
Satisfaction is non-contact with blood simultaneously, and in vivo without wound, precise synchronization control meets blood of human body flowing law, device volume is small
And the demand that can be used for a long time.
As depicted in figs. 1 and 2, aorta extracorporeal counterpulsation heart-assist device, comprising: the counterpulsation being mounted on outside aorta ascendens
Device 7, two synchronous electrodes 8 for being fixed on heart exterior and it is placed in external power supply, synchronizing device and control device.
Wherein counter-pulsation device 7 is mounted on the outside of aorta ascendens, to form artificial-muscle by shape-memory alloy wire, not
With the change and recovery that shape can occur under current bring temperature change, to assist artery to be shunk.Specific knot
Structure is as shown in Figure 3, comprising: aramid fiber net 1, shape-memory alloy wire 2, insulating layer 3 and connecting component；By transverse and longitudinal weaving
Aramid fiber formed aramid fiber net 1 be shape-memory alloy wire 2 installation base body, be in banded structure, in aramid fiber
Alloy wire array is arranged in the side of net 1, and alloy wire array is equidistantly arranged in parallel by a plurality of width direction along aramid fiber net 1
Shape-memory alloy wire 2 form, every strip memory alloy wire 2 along aramid fiber net 1 length direction be in broken line type, thus
Form artificial-muscle.The broken line type arrangement mode of shape-memory alloy wire 2 can provide more powerful auxiliary in unit area
Contraction power, aramid fiber net 1 are that shape-memory alloy wire 2 provides a supporting role.On aramid fiber net 1 outside alloy wire array
Portion is arranged insulating materials and forms insulating layer 3, and the electric current for completely cutting off in shape-memory alloy wire 2 is contacted with aorta, avoids people
Body is conductive.There are the extraction of conducting wire 4, the both ends of every strip memory alloy wire 24 phase of conducting wire with the end respectively in alloy wire array two sides
Even, the conducting wire 4 of two sides is connected to after abdomen pierces through external carries power supply.At the both ends of aramid fiber net 1, setting is useful
In banded structure both ends to be connected to the connecting component to form ring structure, connecting component is to be separately positioned in the present embodiment
Banded structure both ends connection hook 5 and connection annulus 6, connection annulus 6 have it is multiple rows of, with adjust multiform at ring structure it is straight
Diameter.In use, counter-pulsation device by will connect hook 5 with connect after annulus 6 is engaged be in band-like annulus tighten be wrapped in aorta
Outside, the side for being provided with alloy wire array are contacted with aorta ascendens.Actively according to the normal liter of China adult population
29~34mm of arteries and veins diameter range, aorta ascendens length about 5mm, the band-like annulus perimeter L of auxiliary device are 91~106mm, width W
For 3~5mm.When specifically used, the connection annulus of connection hook and different location can be selected to clasp according to aorta diameter.
Marmem SMAs is a kind of new function material with shape memory effect, when it is plastically deformed
Later, reset condition can be restored to by heating.When heating or cooling, changing in SMAs experience shape and hardness
Biggish power can be generated while change.The mechanism of shape memory effect is the diffusionless transformation of solid, when SMAs is in phase alternating temperature
When spending (martensite) below, plastic deformation can produce.When electric current is heated to phase transition temperature (austenite) or more, it again can be extensive
Its undeformed preceding state is arrived again.The materials'use of shape-memory alloy wire 2 is that NiTi system shape memory closes in the present embodiment
Gold, this material are increasingly becoming medicine neck since its good biocompatibility, radiopacity and nuclear magnetic resonance are without influence property
The most widely used metal material in domain, while it also has highly stable shape memory effect.The aorta of normal adult
Diameter is 32mm, i.e. when aorta Zhou Changwei 100mm, in counter-pulsation device in the shrinkage and aorta unit height of alloy wire
As shown in figure 4, when alloy wire Length Contraction 50%, aortic volume is reduced up to 75% the volume variation relation of (1mm).?
Before counter-pulsation device 7 is wrapped in aorta ascendens, plasticity need to be brought it about to the stretched pretreatment of NiTi shape-memory alloy wire
Deformation.
(two electrocardioelectrodes are used to survey the potential of heart surface to two electrocardioelectrodes 8 being fixed on left ventricle muscular wall
Difference only exports an ecg wave form although two electrodes) for acquiring the electrocardiosignal of left ventricle, while passing through fixation
Pulse pressure sensors 9 on the outside of the internal aorta ascendens on vascular wall acquire pulse signal, and pulse pressure sensors 9 belong to low-power consumption sensing
Device can be conventional blood pressure sensor or flexible skin class implantable blood pressure sensor, provide electricity by counter-pulsation device battery
Source.Be sent to using electrocardiosignal and pulse signal as auxiliary device with the synchronization signal that cardiac synchronous works be placed in it is external same
Device is walked, after synchronizing device receives synchronization signal, synchronization signal is analyzed, identifies the triggering mark of synchronization signal
Point: i.e. dicrotic notch (DN) point of the R wave wave crest point of electrocardiosignal and pulse signal, wherein the R wave wave crest point pair of electrocardiosignal
It should be opened in left ventricular contraction phase, that is, aorta petal, blood is pumped out by left ventricle to the starting point of aorta；Pulse
Dicrotic notch (DN) point of signal, terminates, diastole, that is, aortic valve closing, blood corresponding to the left ventricular contraction phase
Liquid is exported by aorta to the starting point of whole body.Synchronizing device exports triggering letter to control device after recognizing triggering identification point
Number.
Control device controls counter-pulsation device, makes counter-pulsation device after the trigger signal for receiving synchronizing device output
It is synchronous to execute contraction or diastolic action at the time of ventricular diastole or contraction, to oppress or loosen aorta.The present embodiment
The power supply that middle control device controls counter-pulsation device 7 when exporting low level is closed, the power supply of output high level control counter-pulsation device 7
It opens, thus control device exports low level when the left ventricular contraction phase starts, high level is exported at the end of the systole phase, thus
The size for controlling electric current in counter-pulsation device makes counter-pulsation device execute corresponding diastole and contractive action by the variation of temperature.
Its working principle is that:
It, first will be collected synchronous with the sensor for acquiring pulse signal by synchronous electrode within a cardiac cycle
Signal is sent to synchronizing device: when synchronizing device detects LV Diastolic identification point (dicrotic notch (DN) point), to control
Device exports trigger signal, and control device exports high level to power supply, and power supply opening closes the NiTi shape memory of counter-pulsation device
Spun gold electrified regulation, temperature reach phase transition temperature or more, so that counter-pulsation device is retracted to the state before stretching, and generate binding force
Aorta is squeezed, auxiliary aorta is shunk, and blood vessel local volumetric is reduced, and pressure rises, to improve blood pressure potential energy, pushes blood
Flowing, blood is pumped out to whole body.
When synchronizing device detects left ventricular contraction identification point (R wave wave crest point), control device exports low electricity to power supply
Flat, the NiTi shape-memory alloy wire temperature of power cut-off, counter-pulsation device is cooled to phase transition temperature hereinafter, restoring to stretching shape
State, i.e. counter-pulsation device diastole, aortic diastolic reduce vascular resistence, and ventricular diastole sucks atrial veins blood.
Working sequence in one cycle aroused in interest cooperates the human body heart as shown in figure 5, from there through pulsating synchronously control
Dynamic period, the continuous repeated work of counter-pulsation device can be realized the contraction of auxiliary aorta and diastole, reduce the left heart of paradoxical expansion
Room afterload increases the whole body and coronary perfusion of blood pressure and diastole, realizes heart assistance function.
In addition, the small in size and reachable 10 years radioactive isotope electricity as long as the service life can be selected in the external power supply that carries
Pond not only avoids conducting wire and pierces through the possible displacement risk of skin, has also prevented and the extraneous infection for contacting and causing.
Synchronizing device and control device can use existing the relevant technologies.
Embodiment 2:
On the basis of above-described embodiment 1, for the reliability for improving the auxiliary device, the cardiechema signals for increasing left ventricle are made
It is tied when can't detect dicrotic notch (DN) point of pulse signal using cardiechema signals as the left ventricular contraction phase for synchronization signal
Beam, the id signal that diastole starts, i.e. synchronizing device export trigger signal after detecting cardiechema signals, to control device,
Control device exports high level, power supply opening to power supply, and counter-pulsation device assists aorta to shrink.
Embodiment 3:
Difference with above-described embodiment 1 is: control device controls counter-pulsation device 7 when exporting low level in the present embodiment
Power supply opening, output high level control counter-pulsation device 7 power supply close；Thus control device is when the left ventricular contraction phase starts
High level is exported, low level is exported at the end of the systole phase, to control the size of electric current in counter-pulsation device, passes through the change of temperature
Change makes counter-pulsation device execute corresponding diastole and contractive action.
Embodiment 4:
Entire auxiliary device (including power supply, synchronizing device, control device, counter-pulsation device) is placed in vivo, it such as will be electric
Source is placed in thoracic cavity, and patient also can get maximum freedom of movement.
To sum up, the above is only the preferred embodiments of the present utility model only, is not intended to limit the protection of the utility model
Range.Within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on should be included in
Within the protection scope of the utility model.
Claims (11)
1. a kind of aorta extracorporeal counterpulsation ventricular failure auxiliary device, it is characterised in that: include: counter-pulsation device, synchronizing device, control
Device and power supply；
The counter-pulsation device is the artificial muscle that circumferential direction is wrapped on the outside of aorta ascendens, is formed by two or more shape-memory alloy wires
Meat；
The power supply is used to provide driving current to the counter-pulsation device；
The synchronizing device identifies heart contraction therein/relax using the physiological signal of collected left ventricle as synchronization signal
Identification point is opened, exports trigger signal to the control device after recognizing heart contraction/diastole identification point；
After the control device receives the trigger signal of synchronizing device, the drive that the power supply is exported to the counter-pulsation device is controlled
The size of streaming current carries out pulsating control to counter-pulsation device, makes counter-pulsation device at the time of ventricular diastole or contraction, synchronous to receive
Contracting or diastole aorta ascendens.
2. aorta extracorporeal counterpulsation ventricular failure auxiliary device as described in claim 1, it is characterised in that: the counter-pulsation device packet
It includes: aramid fiber net, shape-memory alloy wire and insulating layer；The aramid fiber net is the installation base of shape-memory alloy wire
Shape-memory alloy wire array is arranged in the side of the aramid fiber net in body, and the shape-memory alloy wire array is by two
The shape-memory alloy wire composition arranged in parallel along the width direction of aramid fiber net above；In the online alloy of the aramid fiber
Insulating layer is arranged in silk array external；The two sides of the shape-memory alloy wire array are provided with conducting wire, every bar shaped shape memory alloys
The both ends of silk are connected with the conducting wire at the end respectively, and the conducting wire of two sides is connected after drawing with the power supply.
3. aorta extracorporeal counterpulsation ventricular failure auxiliary device as claimed in claim 2, it is characterised in that: every shape note
Alloy wire is recalled along the circumferential direction of aramid fiber net in broken line type.
4. aorta extracorporeal counterpulsation ventricular failure auxiliary device as claimed in claim 2 or claim 3, it is characterised in that: the aramid fiber is fine
Tieing up net is in banded structure, and both ends are provided with for banded structure both ends to be connected to the connecting component to form ring structure.
5. aorta extracorporeal counterpulsation ventricular failure auxiliary device as claimed in claim 4, it is characterised in that: the connecting component is
It is separately positioned on the connection annulus of the connection hook and a row at banded structure both ends or more.
6. aorta extracorporeal counterpulsation ventricular failure auxiliary device as claimed in claim 1,2 or 3, it is characterised in that: the shape
The material of memory alloy wire is NiTi system marmem.
7. aorta extracorporeal counterpulsation ventricular failure auxiliary device as claimed in claim 1,2 or 3, it is characterised in that: the synchronization
Signal is the electrocardiosignal and pulse signal of left ventricle, and wherein heart contraction identification point is the R wave wave crest point of electrocardiosignal, heart
Diastole identification point is dicrotic notch (DN) point of pulse signal.
8. aorta extracorporeal counterpulsation ventricular failure auxiliary device as claimed in claim 7, it is characterised in that: the synchronization signal is also
Including cardiechema signals, when can't detect dicrotic notch (DN) point of pulse signal, using the cardiechema signals as diastole
Identification point.
9. aorta extracorporeal counterpulsation ventricular failure auxiliary device as claimed in claim 7, it is characterised in that: by being fixed on a liter master
Pulse pressure sensors on the outside of artery on vascular wall measure the pulse signal.
10. aorta extracorporeal counterpulsation ventricular failure auxiliary device as claimed in claim 7, it is characterised in that: by being fixed on a left side
The electrocardiosignal of two electrocardioelectrodes acquisition left ventricle on ventricular muscle wall.
11. aorta extracorporeal counterpulsation ventricular failure auxiliary device as claimed in claim 1,2 or 3, it is characterised in that: the electricity
Source, synchronizing device and control device are placed in external or are placed in vivo.
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| CN201721833543.7U CN209048760U (en) | 2017-12-25 | 2017-12-25 | A kind of aorta extracorporeal counterpulsation ventricular failure auxiliary device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108175882A (en) * | 2017-12-25 | 2018-06-19 | 清华大学深圳研究生院 | A kind of aorta extracorporeal counterpulsation ventricular failure auxiliary device |
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2017
- 2017-12-25 CN CN201721833543.7U patent/CN209048760U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108175882A (en) * | 2017-12-25 | 2018-06-19 | 清华大学深圳研究生院 | A kind of aorta extracorporeal counterpulsation ventricular failure auxiliary device |
| CN108175882B (en) * | 2017-12-25 | 2023-11-07 | 清华大学深圳研究生院 | Aortic external counterpulsation ventricular failure auxiliary device |
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Granted publication date: 20190702 Effective date of abandoning: 20231107 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20190702 Effective date of abandoning: 20231107 |