CN109821098A - A kind of piezoelectric stack drive-type infusion device - Google Patents
A kind of piezoelectric stack drive-type infusion device Download PDFInfo
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- CN109821098A CN109821098A CN201910187870.7A CN201910187870A CN109821098A CN 109821098 A CN109821098 A CN 109821098A CN 201910187870 A CN201910187870 A CN 201910187870A CN 109821098 A CN109821098 A CN 109821098A
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Abstract
The present invention relates to a kind of piezoelectric stack drive-type infusion devices, belong to medical instruments field.Base top is equipped with into hole, through outlet plenum and the vestibule being connected to and at least two body cavity groups that are made of body cavity of portalling；Only one body cavity is equipped with snout cavity and venthole in each body cavity group, is provided only with venthole on other body cavitys；Diaphragm is crimped on pedestal by main body, and bottom part body, which is equipped with, distinguishes equal guide hole group and guide hole with body cavity group and its contained body cavity quantity, and guide hole is equal with body lumen diameter and balanced configuration is in diaphragm two sides, diaphragm and body cavity and inlet valve composition compression chamber；Compression chamber in same body cavity group is simultaneously unified into compression chamber group, each compression chamber group series connection；Piston is pressed on diaphragm by the piezoelectric stack in guide hole；The blister cavities of body top is provided with the medicine bag being made of medicine cavity and air cavity；Air cavity is connected to through appendix with portalling, and is equipped with flow valve and syringe needle on the perfusion tube of medicine cavity；Same compression chamber group septation deformation direction is identical, and two adjacent compression chamber group septation deformation directions are opposite.
Description
Technical field
The invention belongs to medical instruments fields, and in particular to a kind of piezoelectric stack drive-type infusion device.
Background technique
Existing drug administration by injection mainly has intravenous injection, intramuscular injection and subcutaneous injection etc..Intravenous injection is also referred to as infusion administration,
Existing infusion device is mostly made of infusion bottle, perfusion tube and infusion support, and infusion bottle hanging is self-possessed on infusion support, by medical fluid
It flows and is injected into the blood vessel of people through perfusion tube.This infusion mode can bring many problems in actual use: pass through hand
Dynamic method adjusts flow, and flow control accuracy is inadequate；Patient walks about, go to the toilet when need other people to hold infusion bottle high, activity is not
Blood backflow can also be made when convenient and infusion bottle insufficient height；It needs patient or nursing staff to guard for a long time, such as sends out not in time
Now infusion is completed to may also result in accident；Medical fluid is contacted with air, and there are also contaminated possibilities when surrounding air is unclean.In addition to
Outside above-mentioned immediate problem, also it can shorten transfusion time by reducing the methods of amount of solution, quickening transfusion speed sometimes, this not only adds
Weighed heart burden, also affected therapeutic effect: intramuscular injection is with subcutaneous injection by drug injection within the relatively short time
To muscle or subcutaneously, maximum drawback is that blood concentration differs greatly in an injection cycle, is unfavorable for effective absorption of drug
With utilization, because are as follows: most drugs have preferred concentration range in human body, when drug concentration is excessively high have toxic side effect, mistake
To not have therapeutic effect when low.Therefore, the microminiature Portable medicine that the drug injection time can be extended, keep reasonable drug concentration
Controlled-release device or system are urgently needed for current medical field.
Summary of the invention
The present invention proposes a kind of piezoelectric stack drive-type infusion device, and embodiment of the present invention is: base top is equipped with
Enter hole, through outlet plenum and the vestibule being connected to and at least two body cavity groups that are made of body cavity of portalling, from left to right in each body cavity group
Contained body cavity quantity is successively reduced；A body cavity in each body cavity group is equipped with snout cavity and venthole, only sets on other body cavitys
There is venthole；Snout cavity in the body cavity group of the leftmost side is connected to hole is entered, and the venthole in the body cavity group of the rightmost side is connected to outlet plenum；
Venthole in same body cavity group is connected to through intercommunicating pore with venthole, and the snout cavity and venthole in two or so adjacent body cavity groups connect
It is logical；Disengaging oral cavity and the valve block installed in it respectively constitute terminal valve, and valve block is cantilever valve or disc valve；Main body is through spiral shell
It binds on pedestal and diaphragm is crimped on pedestal, bottom part body is equipped with equal with body cavity group and its contained body cavity quantity difference
Guide hole group and guide hole, guide hole is equal with the diameter of body cavity, guide hole and body cavity the balanced configuration two sides above and below diaphragm, diaphragm and bottom
It is equipped with sealing ring, diaphragm and body cavity between seat and inlet valve constitutes compression chamber；Compression chamber in same body cavity group is simultaneously unified into compression chamber
Group, each compression chamber group series connection；Piston is crimped on diaphragm by the piezoelectric stack in guide hole, piston be T-type structure and its small end with
Membrane contacts, big end side wall are contacted with guide hole inner wall；Body top is equipped with blister cavities, and blister cavities, which is provided with, to be made of medicine cavity and air cavity
Medicine bag；Air cavity is connected to through appendix with portalling, and is equipped with flow valve and syringe needle on the perfusion tube of medicine cavity；In work, same compression
The deformation direction of chamber group septation is identical, piezoelectric stack elongates or shortens in i.e. same guide hole group, in two adjacent compression chamber groups
The deformation direction of diaphragm is opposite；Each compression chamber group, which accumulate step by step after compression to gas, enters air cavity, air cavity through appendix
Product increases and squeezes medicine cavity, and the medical fluid pressure increase in medicine cavity is simultaneously discharged from perfusion tube and syringe needle, and medical fluid discharge rate can be through piezoelectricity
The driving voltage stacked or flow valve regulation.
For having the infusion device there are three compression chamber group, from right to left, guide hole group is successively defined as guide hole group one, two
With three, body cavity group is successively defined as body cavity group one, two and three, and inlet valve is successively defined as inlet valve one, two and three, compression chamber group
It is successively defined as compression chamber group one, two and three, then specific work process are as follows: the piezo stack in upper half, in guide hole group one and three
Heap shortens, the piezoelectric stack in guide hole group two extends, and the volume of compression chamber group one and three increases, two volume of compression chamber group reduces, into
Mouth valve one and three is opened, inlet valve two and outlet valve are closed, and compression chamber group one and three sucks gas, gas is discharged in compression chamber group two
Body, this is suction process；In lower half, piezoelectric stack shortens in the piezoelectric stack elongation, guide hole group two in guide hole group one and three,
The volume of compression chamber group one and three reduces, two volume of compression chamber group increases, and inlet valve one and three is closed, inlet valve two and outlet valve are opened
It opens, gas is discharged in compression chamber group one and three, compression chamber group two sucks gas, this is discharge process；Above-mentioned sucking and discharge process
In, gas experienced the compression of accumulation step by step of compression chamber group three, two and one, and output pressure improves step by step.
In the present invention, the maximum gas storage pressure in air cavity is Pmax=P0ηp{(1+α)/(1-α)[β+(1+α)/(1-α)]n-1-
1 }, in which: P0For standard atmospheric pressure, ηpFor efficiency factor, α > 0 is compression ratio, i.e. pressure caused by piezoelectric stack dilatation
The ratio between volume variable quantity and the volume of compression chamber of contracting chamber, β > 1 be each adjacent compression chamber group in contained compression chamber quantity ratio most
Small value, n >=2 are the quantity of compression chamber group；To obtain maximum compression ratio, when the beryllium-bronze of diaphragm 0.1,0.2 and 0.3mm thickness most
Good piston small end and big end radius ratio is respectively 0.79,0.65 and 0.55, and compression chamber height is that piezoelectric stack is acted on by voltage
Elongation；When two adjacent compression chamber groups are interconnected, valve block i.e. therebetween is opened, a fairly large number of compression chamber group containing compression chamber
Volume variable quantity not less than the negligible amounts containing compression chamber compression chamber group volume variable quantity.
Advantage and characteristic: gas pressure can be increased substantially using the method for accumulation compression；Using gas-powered medical fluid, easily
In accurately controlling transfusion speed by driving voltage, without erecting by overhang, it is moved easily and carries；Medical fluid does not connect with air
It touches, phenomena such as medical fluid is contaminated, gas enters blood vessel and backflow of blood will not occur, without guard in real time, securely and reliably.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of infusion device in a preferred embodiment of the present invention；
Fig. 2 is the A-A cross-sectional view of Fig. 1；
Fig. 3 is structural schematic diagram when infusion device works in a preferred embodiment of the present invention；
Fig. 4 is the structural schematic diagram of main body in a preferred embodiment of the present invention；
Fig. 5 is the bottom view of Fig. 4；
Fig. 6 is the structural schematic diagram of pedestal in a preferred embodiment of the present invention；
Fig. 7 is the top view of Fig. 6.
Specific embodiment
The top of pedestal c is equipped with into hole c1, the vestibule c3 and at least two being connected to through outlet plenum c6 with the c7 that portals by body cavity
The body cavity group Ci that c2 is constituted, from left to right the quantity of contained body cavity c2 is successively reduced in each body cavity group Ci；In each body cavity group Ci
One body cavity c2 is equipped on snout cavity c4 and venthole c5, other body cavity c2 and is provided only with venthole c8；Leftmost side body cavity group Ci
In snout cavity c4 be connected to hole c1 is entered, the venthole c5 in the body cavity group Ci of the rightmost side is connected to outlet plenum c6；Same body cavity group
Venthole c5 in Ci is connected to through intercommunicating pore c9 with venthole c8, the snout cavity c4 and venthole in two or so adjacent body cavity group Ci
C5 connection；Snout cavity c4 and outlet plenum c6 and the valve block t installed in it respectively constitute inlet valve vi and outlet valve v, and valve block t is
Cantilever valve or disc valve；The bottom of main body a, which is equipped with, distinguishes equal guide hole group with body cavity group Ci and its contained body cavity c2 quantity
Ai and guide hole a2, guide hole a2 is equal with the diameter of body cavity c2, and main body a is crimped on pedestal through screw on pedestal c and by diaphragm g
On c, guide hole a2 and body cavity c2 balanced configuration in the two sides up and down of diaphragm g, between diaphragm g and pedestal c be equipped with sealing ring, diaphragm g with
Body cavity c2 and inlet valve vi constitutes compression chamber Y；Compression chamber Y in same body cavity group Ci is simultaneously unified into compression chamber group Yi, each compression chamber
Group Yi series connection；Piston e is crimped on diaphragm g by the piezoelectric stack d in guide hole a2, and piston e is T-type structure and its small end and diaphragm
G contact, big end side wall are contacted with the inner wall of guide hole a2；The top of main body a is equipped with blister cavities a1, blister cavities a1 be provided with by medicine cavity b1 and
The medicine bag b that air cavity b2 is constituted；Air cavity b2 is connected to through appendix with the c7 that portals, be equipped on the perfusion tube q of medicine cavity b1 flow valve m and
Syringe needle；In work, the deformation direction of same compression chamber group Yi septation g is identical, piezoelectric stack d stretches in i.e. same guide hole group Ai
Long or shortening, the deformation direction of two adjacent compression chamber group Yi septation g are opposite；Each compression chamber group Yi accumulates gas step by step
Enter air cavity b2 through appendix after compression, air cavity b2 volume increases and squeezes medicine cavity b1, the medical fluid pressure increase in medicine cavity and from
Perfusion tube q and syringe needle discharge, medical fluid discharge rate can driving voltage through piezoelectric stack d or flow valve m adjust.
In the present invention, guide hole group Ai, body cavity group Ci, inlet valve vi, the i in compression chamber group Yi represent sequence from right to left
Number, i=1,2,3 ...；For having the infusion device there are three compression chamber group Yi, from right to left, guide hole group Ai is successively defined
For one A1 of guide hole group, two A2 and three A3, body cavity group Ci is successively defined as one C1 of body cavity group, two C2 and three C3, and inlet valve vi is successively
One v1 of inlet valve, two v2 and three v3 are defined as, compression chamber group Yi is successively defined as one Y1 of compression chamber group, two Y2 and three Y3, then has
Body running process are as follows: the piezo stack in piezoelectric stack d shortening, two A2 of guide hole group in upper half, in guide hole group one A1 and three A3
Heap elongation, the volume of compression chamber group one Y1 and three Y3 increase, two Y2 volume of compression chamber group reduces, and inlet valve one v1 and three v3 are opened
It opening, inlet valve two v2 and outlet valve v closing, compression chamber group one Y1 and three Y3 suck gas, gas is discharged in two Y2 of compression chamber group, this
For suction process；The piezoelectric stack in piezoelectric stack d elongation, two A2 of guide hole group in lower half, in guide hole group one A1 and three A3
Shortening, the volume of compression chamber group one Y1 and three Y3 reduce, two Y2 volume of compression chamber group increases, inlet valve one v1 and three v3 closing,
Inlet valve two v2 and outlet valve v are opened, and gas is discharged in compression chamber group one Y1 and three Y3, two Y2 of compression chamber group sucks gas, this is
Discharge process；In above-mentioned sucking and discharge process, gas experienced the accumulation pressure step by step of three Y3 of compression chamber group, two Y2 and a Y1
Contracting, output pressure improve step by step.
In the present invention, the maximum gas storage pressure in air cavity b2 is Pmax=P0ηp{(1+α)/(1-α)[β+(1+α)/(1-α)]n-1-
1 }, in which: P0For standard atmospheric pressure, ηpFor efficiency factor, α > 0 is compression ratio, i.e. pressure caused by piezoelectric stack d dilatation
The volume variable quantity of contracting chamber Y and the ratio between the volume of compression chamber Y, β > 1 are contained compression chamber Y quantity in each adjacent compression chamber group Yi
The minimum value of ratio, n >=2 are the quantity of compression chamber group Yi；To obtain maximum compression ratio, diaphragm g is 0.1,0.2 and 0.3mm thick
Optimal piston e small end and big end radius ratio are respectively 0.79,0.65 and 0.55 when beryllium-bronze, and compression chamber height is piezoelectric stack
The elongation that d is acted on by voltage；When two adjacent compression chamber group Yi are interconnected, valve block t i.e. therebetween is opened, the number of Y containing compression chamber
The volume variable quantity for measuring more compression chamber group Yi changes not less than the volume of the compression chamber group Yi of the negligible amounts of Y containing compression chamber
Amount.
Claims (1)
1. a kind of piezoelectric stack drive-type infusion device, it is characterised in that: base top is equipped with into hole, through outlet plenum and company of portalling
The body cavity group that logical vestibule and at least two is made of body cavity, from left to right contained body cavity quantity is successively reduced in each body cavity group；
A body cavity in each body cavity group is equipped with snout cavity and venthole, is provided only with venthole on other body cavitys；Leftmost side body cavity group
In snout cavity be connected to hole is entered, the venthole in the body cavity group of the rightmost side is connected to outlet plenum；Venthole in same body cavity group
It is connected to through intercommunicating pore with venthole, the snout cavity in two or so adjacent body cavity groups is connected to venthole；Pass in and out oral cavity and its interior institute
The valve block of installation respectively constitutes terminal valve；Main body is crimped on pedestal on the pedestal and by diaphragm, bottom part body be equipped with
Body cavity group and its contained body cavity quantity distinguish equal guide hole group and guide hole, and guide hole is equal with the diameter of body cavity, guide hole and body cavity
Balanced configuration two sides above and below diaphragm, are equipped with sealing ring, diaphragm and body cavity between diaphragm and pedestal and inlet valve constitutes compression chamber；Together
Compression chamber in one body cavity group is simultaneously unified into compression chamber group, each compression chamber group series connection；Piston is crimped on by the piezoelectric stack in guide hole
On diaphragm, piston is T-type structure and its small end is contacted with membrane contacts, big end side wall with guide hole inner wall；Body top is equipped with capsule
Chamber, blister cavities are provided with the medicine bag being made of medicine cavity and air cavity；Air cavity is connected to through appendix with portalling, and is installed on the perfusion tube of medicine cavity
There are flow valve and syringe needle；In work, the deformation direction of same compression chamber group septation is identical, two adjacent compression chamber group septations
Deformation direction is opposite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910187870.7A CN109821098B (en) | 2019-03-01 | 2019-03-01 | Piezoelectric stack driving type infusion device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910187870.7A CN109821098B (en) | 2019-03-01 | 2019-03-01 | Piezoelectric stack driving type infusion device |
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| Publication Number | Publication Date |
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| CN109821098A true CN109821098A (en) | 2019-05-31 |
| CN109821098B CN109821098B (en) | 2021-05-28 |
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| CN201910187870.7A Active CN109821098B (en) | 2019-03-01 | 2019-03-01 | Piezoelectric stack driving type infusion device |
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