CN107854771A - A kind of adjustable pressure differential valve of surgery - Google Patents
A kind of adjustable pressure differential valve of surgery Download PDFInfo
- Publication number
- CN107854771A CN107854771A CN201710263931.4A CN201710263931A CN107854771A CN 107854771 A CN107854771 A CN 107854771A CN 201710263931 A CN201710263931 A CN 201710263931A CN 107854771 A CN107854771 A CN 107854771A
- Authority
- CN
- China
- Prior art keywords
- pressure regulation
- rotating disk
- pressure
- spring
- ruby ball
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
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- 238000001356 surgical procedure Methods 0.000 title claims abstract description 6
- 230000000151 anti-reflux effect Effects 0.000 claims abstract description 13
- 208000003906 hydrocephalus Diseases 0.000 claims abstract description 11
- 201000010099 disease Diseases 0.000 claims abstract description 6
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 claims abstract description 6
- 210000000278 spinal cord Anatomy 0.000 claims abstract description 4
- 239000010979 ruby Substances 0.000 claims description 25
- 229910001750 ruby Inorganic materials 0.000 claims description 25
- 230000005291 magnetic effect Effects 0.000 claims description 19
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 239000003814 drug Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 239000004744 fabric Substances 0.000 claims 1
- 210000001175 cerebrospinal fluid Anatomy 0.000 abstract description 12
- 230000005292 diamagnetic effect Effects 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 description 30
- 230000000694 effects Effects 0.000 description 18
- 238000000034 method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 210000004556 brain Anatomy 0.000 description 5
- 230000004087 circulation Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 3
- 241000270295 Serpentes Species 0.000 description 2
- 210000004289 cerebral ventricle Anatomy 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 235000015170 shellfish Nutrition 0.000 description 2
- 206010010506 Congenital hydrocephalus Diseases 0.000 description 1
- 206010019196 Head injury Diseases 0.000 description 1
- 206010058025 Hypertensive hydrocephalus Diseases 0.000 description 1
- 208000032851 Subarachnoid Hemorrhage Diseases 0.000 description 1
- 210000000576 arachnoid Anatomy 0.000 description 1
- 230000017531 blood circulation Effects 0.000 description 1
- 210000002987 choroid plexus Anatomy 0.000 description 1
- 206010014599 encephalitis Diseases 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000007917 intracranial administration Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 201000003077 normal pressure hydrocephalus Diseases 0.000 description 1
- 230000001717 pathogenic effect Effects 0.000 description 1
- 230000035479 physiological effects, processes and functions Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002980 postoperative effect Effects 0.000 description 1
- 230000003248 secreting effect Effects 0.000 description 1
- 230000028327 secretion Effects 0.000 description 1
- 210000002966 serum Anatomy 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000001225 therapeutic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/22—Valves or arrangement of valves
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3331—Pressure; Flow
Landscapes
- Health & Medical Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Pulmonology (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- External Artificial Organs (AREA)
Abstract
The present invention provides a kind of surgery cerebrospinal fluid shunt solution, is a kind of adjustable pressure differential valve, is mainly used in the cerebrospinal fluid shunt of the diseases such as neurosurgery hydrocephalus, spinal cord empty, it is characterized in that there is pressure adjustable, the functions such as diamagnetic field, anti-reflux, anti-siphon.
Description
Technical field
The present invention relates to a kind of surgery with can adjust pressure differential valve, the shunting of neurosurgery cerebrospinal fluid is mainly used in, being belonged to
In surgical medical equipment field.
Background technology
Hydrocephalus and spinal cord empty are neurosurgery common diseases, are due to the not smooth caused a kind of disease of cerebrospinal fluid circulation
Disease, cerebrospinal fluid circulation are a parts for normal person's physiological circulation, and cerebrospinal fluid is produced by the choroid plexus of telocoele, entered by side opening
Enter three ventricles of the brain, Fourth ventricule, and myelocoele entered by mesotube, after flow through Fourth ventricule medium pore and side opening enters brain table
Face cavum subarachnoidale, the absorbed into serum at arachnoid villi, into the blood circulation of human body, the daily cerebrospinal fluid secretion of normal person
Amount is about 350-500ml, and the cerebrospinal fluid amount of normal ventricular system is about 150-300ml, therefore is inhaled when the secretory volume of cerebrospinal fluid is more than
Just occur that the ventricles of the brain are progressively expanded, and then develop into hydrocephalus during receipts amount.Hydrocephalus can be divided into communicating brain according to type and accumulate
Water, i.e., do not cause freely because cerebrospinal fluid absorbs；Internal hydrocephaly, i.e., there is the position of obstruction in cerebrospinal fluid circulation path, than
Such as：Oncothlipsis etc..It can be divided into children with congenital hydrocephalus, and secondary hydrocephalus, Secondary cases brain according to pathogenic factor
Ponding includes the hydrocephalus caused by factor such as craniocerebral trauma, subarachnoid hemorrhage, encephalitis, neurosurgery be postoperative.According to cranium
The height of interior pressure can be divided into hypertensive hydrocephalus and normal pressure hydrocephalus.
Hydrocephalus preferred ventriculo-peritoneal shunt in the treatment, the ventricles of the brain-atrium shunting, the ventricles of the brain-mistake shape can also be selected in addition
Sinus shunts, and therapeutic modality, the shunt operation such as the ventricles of the brain-bladder shunting need to apply isocon, and isocon is divided into constant pressure shunting at present
Pipe, i.e., can not carry out pressure controlled isocon, and pressure adjustable type isocon, you can set to adjust isocon as needed
The pressure put.Due to the particularity of ventricular system, and the continually changing feature of pressure, therefore pressure-adjustable isocon more meets physiology
Feature, also it is more suitable for neurosurgery needs.
At present, the pressure adjustable type isocon clinically applied is essentially from Johnson ＆ Johnson of the U.S., U.S.'s Medtronic, the German bright snake of shellfish
Board, the product of French Sophysa Inc., the pressure-adjustable principle of each producer's isocon is different, such as：Johnson Co.
The wireless servo motor principle used, Medtronic Inc. of the U.S. use compression spring principle, the German bright snake board of shellfish and French Suo Fei
Sa companies are using pressure shell fragment etc..The isocon product of the domestic and international market in the field is all from above-mentioned four company.In this hair
In bright, inventor employs brand-new voltage regulating mode, i.e. the elastic principle of pressure regulation spring, and pressure lock mode, i.e. pressing are eccentric
The principle of circle unblock, can be good at realizing pressure adjustable, and the effect of diamagnetic field, can allow the present apparatus under magnetic field, such as
Pressure is constant in the presence of magnetic resonance.Meanwhile the present invention is provided simultaneously with one-directional fluid flow, anti-backflow function and anti-siphon
Function.
The content of the invention
It is an object of the invention to provide a kind of adjustable pressure differential valve of new cerebrospinal fluid shunt, it has pressure can
Adjust, diamagnetic field, anti-reflux, the function such as anti-siphon.
A kind of adjustable pressure differential valve of surgery, it includes：
Pressure regulating part point, including：
Pressure regulation ruby ball, pressure regulation lever, pressure regulation spring, pressure regulation magnetic, rotating disk, locking teeth, curved surface spring, sliding block.
Housing part, including：
With reference to magnet, engaging tooth, being unlocked by pressing switch, center pillar.
Anti-reflux part, including：
Non-return ruby ball, spring.
Anti-siphon part, including can be with the pressing plate of folding.
Liquid communication part, including：
Entrance, outlet, and through the cavity inside described device.
Closure entrance above the pressure regulation ruby ball of described device, lower section connection pressure regulation lever, passes through pressure regulation spring and rotating disk
It is connected.
The pressure regulation spring of described device is connected with rotating disk, and can be done clockwise or counterclockwise with rotating disk.When rotating disk is done
When turning clockwise, coupled pressure regulation spring is more nervous, therefore bigger to the drag force of pressure regulation lever, so as to the red treasured of pressure regulation
Pressure caused by stone ball is bigger, and then the pressure of the stifled entrance of pressure regulation ruby ball sealing is bigger.
The pressure regulation magnetic potential of described device is symmetric inside rotating disk, is respectively made up of one piece of magnet, and can be with rotating disk one
Play rotation.
The sliding block of described device is located at rotating disk center of inside, and can be slid laterally in rotating disk, is engraved among it for a circle
Empty part, hollow-out parts are an inclined-plane, are affixed with center pillar, and the rear of locking teeth is connected bullet of the side in curved surface spring with curved surface spring
Under power effect, it is bonded by locking teeth with engaging tooth.
The center pillar of described device is located at below casing, is connected with being unlocked by pressing switch, and for cylinder in cylinder, tip is in diagonal
Circular cone sample, it is relative with the rotating disk round dot of lower section, and be affixed with sliding block circle openwork part.When being unlocked by pressing is switched by from outer
In the presence of square pressure, center pillar internally produces displacement, and under the ramp effect of the inclined-plane of center pillar and circular hollow-out parts, sliding block exists
Moved on rotating disk, so as to which locking teeth separates with engaging tooth.
The engaging tooth of described device is located at casing internal, and inner side is bonded with the locking teeth of sliding block.
The reference magnet of described device is located at casing internal, is made up of one piece of magnet, for read pressure set numerical value and
Reference point during pressure regulation.
The non-return ruby ball sealing of described device blocks up the efferent tract of pressure regulation part, and lower section is connected with spring.Pass through in fluid
When pressure-regulating portion shunts the anti-reflux part through described device, in the case of Fluid pressure acts on non-return ruby ball, spring quilt
Compression, so as to which fluid flows through anti-part of backflowing.When fluid inversely enters anti-reflux part, due to non-return ruby ball and spring
Effect, ensure the efferent tract sealing-in with pressure regulation part all the time of non-return ruby ball, play a part of anti-reflux.
The anti-siphon part side of described device is connected with device anti-reflux part, lower section connection outlet, and inside has one can
The pressing plate cover outlet of folding.Pressing plate is open under the pressure effect from fluid, when the efferent tract of described device is outside negative pressure
During state, due to siphonage, pressing plate is closed, so as to prevent fluid is excessive, too fast outflow.
Preferably, pressure of the described device under regulator effect adjusts process：Regulator act on casing by
Pressure solution lock-switch, makes it be acted on by the pressure from regulator, center pillar internally produces displacement, in the inclined-plane of center pillar and circle
Under the ramp effect of shape hollow-out parts, sliding block is moved on rotating disk, and curved surface spring is compressed, so as to which locking teeth separates with engaging tooth,
The magnetite of pressure regulation magnetic and regulator " N-S " is attracting, clockwise or counterclockwise regulator, and pressure regulation magnetic is with regulator
Rotation, then drive rotating disk clockwise or counterclockwise, the rotation of driven by rotary disc pressure regulation spring, bring it about nervous or relaxation, after
And act on the drag force on pressure regulation lever and produce corresponding size variation, the pressure for being ultimately applied to pressure regulation ruby ball produces
Corresponding size variation.The pressure effect that release regulator switchs to being unlocked by pressing, sliding block act in the elastic force of curved surface spring
Under, locking teeth is bonded again with engaging tooth, the pressure as set.
Described regulator is a kind of pressure regulator that can act on apparatus of the present invention, and it can be filled to the present invention
Put being unlocked by pressing switch and produce pressure effect, while the magnetite of its bottom can attract each other with the pressure regulation magnetic of apparatus of the present invention,
Then the rotation of rotating disk can be driven.
Described device is under magnetic fields, such as under magnetic resonance, anti-magnetic field process：Under magnetic fields, in the dress
The a direction put can produce an extra magneticaction, because the moving part of described device is rotating disk and pressure regulation spring,
And it can only do clockwise or counterclockwise, it is impossible to move up and down, under locking teeth and the effect of the snap-lock of engaging tooth, turn
Disk and pressure regulation spring can not be done clockwise or counterclockwise, immovable under the magneticaction of extraneous either direction, therefore
Do not influenceed after pressure setting by external magnetic field.
The process fluid flow of described device：After fluid enters from the porch of described device, pressure regulation ruby is acted on
On ball, when Fluid pressure is more than the pressure that described device is set, fluid can press off pressure regulation ruby ball downwards, and rear fluid is walked
In pressure regulation partial interior, non-return ruby ball is pressed off afterwards, and fluid flows through anti-reflux part, and rear fluid presses off pressing plate and flows through anti-rainbow
Part is inhaled to flow out from described device exit.
Purposes of the described device in the medicine equipment for preparing the diseases such as treatment hydrocephalus, spinal cord empty.It can root
According to the different situations of intracranial pressure, dynamic adjustment sets pressure, to adapt to the demand of clinical treatment.
In this application, if be not particularly described, the position relationship of each component is to be based on position shown in the drawings
Relation, used device, instrument, component, size and other conditions etc. is put all to be well-known in the art, or ability
Field technique personnel combine what prior art can be realized according to the description of application.
The description as described in term in the present invention, if with the difference of the description before this area, should be with retouching in the application
State and be defined.
Brief description of the drawings
Fig. 1 is the front cross-sectional view of apparatus of the present invention；
Fig. 2 is the side cut away view of apparatus of the present invention；
Fig. 3 is the schematic diagram of the pressure regulation part of apparatus of the present invention；
Fig. 4 is that the pressure-regulating portion of apparatus of the present invention decomposes the schematic diagram of lock status；
Fig. 5 is the schematic diagram of the pressure regulation part lock-out state of apparatus of the present invention；
Fig. 6 is the side profile schematic diagram of the lock-out state of apparatus of the present invention；
Fig. 7 is the side profile schematic diagram of the released state of apparatus of the present invention；
Fig. 8 is the side profile schematic diagram that the fluid stream of apparatus of the present invention does well；
Fig. 9 regulator schematic diagrames；
Label title in figure：(1) entrance；(2) pressure regulation ruby ball；(3) with reference to magnet；(4) pressure regulation lever；(5) pressure regulation
Spring；(6) rotating disk；(7) pressure regulation magnetic；(8) sliding block；(9) curved surface spring；(10) locking teeth；(11) engaging tooth；(12) center pillar；(13)
Being unlocked by pressing switchs；(14) non-return ruby ball；(15) spring；(16) pressing plate；(17) export；(18) regulator；(19) machine
Shell.
Embodiment
The present invention will be further described below in conjunction with the accompanying drawings
Embodiment 1：For a preferable implementation process of apparatus of the present invention.
Pressure of the described device under regulator effect adjusts process：As shown in accompanying drawing 1-9, regulator (18) effect
(13) are switched in the being unlocked by pressing of casing (19), it is acted on by the pressure from regulator (18), center pillar (12) is inside
Portion produces displacement, and under the ramp effect of the inclined-plane of center pillar (12) and sliding block (8) circular hollow-out parts, sliding block (8) is on rotating disk (6)
Mobile, curved surface spring (9) is compressed, so as to which locking teeth (10) separates with engaging tooth (11), pressure regulation magnetic (7) and regulator (18)
Magnetite " N-S " it is attracting, regulator (18) clockwise or counterclockwise, pressure regulation magnetic (7) rotates with regulator (18),
Then drive rotating disk (6) clockwise or counterclockwise, driven by rotary disc pressure regulation spring (5) rotation, bring it about nervous or relaxation, after
And act on the drag force on pressure regulation lever (4) and produce corresponding size variation, it is ultimately applied to the pressure of pressure regulation ruby ball (2)
Power produces corresponding size variation.The pressure effect that regulator (18) switchs (13) to being unlocked by pressing is discharged, sliding block (8) is in song
Under the elastic force effect of diaphragm flexures (9), locking teeth (10) is bonded again with engaging tooth (11), the pressure as set.
Embodiment 2：
The process fluid flow of described device：As shown in accompanying drawing 1 or 8, fluid enters from the entrance (1) of described device
Afterwards, act on pressure regulation ruby ball (2), when Fluid pressure is more than the pressure that described device is set, fluid can press off downwards
Pressure regulation ruby ball (2), rear fluid navigate within pressure regulation partial interior, press off non-return ruby ball (14) afterwards, fluid flows through anti-
Backflow part, rear fluid presses off pressing plate (16) and flows through anti-siphon part to flow out from described device outlet (17).
Embodiment 3：
The anti-reflux process of described device：As shown in Figure 1, anti-through described device is shunted by pressure-regulating portion in fluid to return
During stream part, in the case of Fluid pressure acts on non-return ruby ball (14), spring (15) is compressed, so as to fluid flow through it is anti-
Backflow part.When fluid inversely enters anti-reflux part, due to the effect of non-return ruby ball (14) and spring (15), ensure
The efferent tract sealing-in with pressure regulation part all the time of non-return ruby ball, plays a part of anti-reflux.
Embodiment 4：
The anti-siphon process of described device：As shown in accompanying drawing 6,7 or 8, when fluid flows through the anti-siphon part of described device,
Pressing plate (16) is flowed out by the lower opening of pressure effect from fluid, rear fluid by outlet (17) place of described device, works as institute
When the outlet (17) for stating device is negative pressure state outside, due to siphonage, pressing plate (16) is closed, so as to prevent that fluid is excessive, mistake
Fast outflow.
Embodiment 5：
The pressure of described device sets locking process：As shown in Figure 1, under magnetic fields, such as under magnetic resonance, in institute
An extra magneticaction can be produced by stating a direction of device, due to described device moving part for rotating disk (6) and
Pressure regulation spring (5), and it can only do clockwise or counterclockwise, it is impossible to move up and down, in locking teeth (10) and engaging tooth (11)
Snap-lock effect under, rotating disk (6) and pressure regulation spring (5) can not be done clockwise or counterclockwise, in extraneous either direction
Magneticaction under it is immovable, therefore pressure setting after do not influenceed by external magnetic field.
The purpose of embodiment as described above is to be further described the embodiment of the present invention, not
The present invention is imposed any restrictions, every any simple modification, change and equivalent structure substantially made according to the technology of the present invention becomes
Change, be still within the scope of the technical scheme of the invention.
Claims (10)
1. a kind of adjustable pressure differential valve of surgery, it includes：
(1) pressure regulating part point, including：
Pressure regulation ruby ball, pressure regulation lever, pressure regulation spring, pressure regulation magnetic, rotating disk, locking teeth, curved surface spring, sliding block.
(2) housing part, including：
With reference to magnet, engaging tooth, being unlocked by pressing switch, center pillar.
(3) anti-reflux part, including：
Non-return ruby ball, spring.
(4) anti-siphon part, including can be with the pressing plate of folding.
(5) liquid communication part, including：
Entrance, outlet, and through above-mentioned (1), (2), (3), the cavity of (4) 4 parts.
2. device according to claim 1, it is characterized in that：Closure entrance above pressure regulation ruby ball, lower section connection pressure regulation
Lever, it is connected by pressure regulation spring with rotating disk.Pressure regulation spring is connected with rotating disk, and can be done clockwise or counterclockwise with rotating disk.
3. according to the device any one of claim 1-2, it is characterized in that：Pressure regulation magnetic potential is inside rotating disk, in symmetrical point
Cloth, respectively it is made up of, and can be rotated together with rotating disk one piece of magnet.
4. according to the device any one of claim 1-3, it is characterized in that：Sliding block is located at rotating disk center of inside, and can be
Slid laterally in rotating disk, be among it a circular openwork part, hollow-out parts are an inclined-plane, are affixed with center pillar, side passes through locking
Tooth is bonded with engaging tooth, and locking teeth rear is connected with curved surface spring.
5. according to the device any one of claim 1-4, it is characterized in that：Center pillar is located at below casing, with being unlocked by pressing
Switch be connected, cylinder in cylinder, tip is in diagonal circular cone sample, relative with the rotating disk round dot of lower section, and with sliding block circle hollow out
Part is affixed.
6. according to the device any one of claim 1-5, it is characterized in that：Engaging tooth is located at casing internal, inner side and cunning
The locking teeth fitting of block.
7. device according to claim 1, it is characterized in that：It is located at casing internal with reference to magnet, is made up of one piece of magnet.
8. according to the device any one of claim 1-6, it is characterized in that：Non-return ruby ball sealing blocks up the stream of pressure regulation part
Engage in this profession, lower section is connected with spring.
9. the device according to claim 1 or 8, it is characterized in that：Anti-siphon part side is connected with device anti-reflux part,
There is a retractable pressing plate cover outlet lower section connection outlet, inside.
10. according to the device described in claim 1-9 in the medicine equipment for preparing the diseases such as treatment hydrocephalus, spinal cord empty
Purposes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710263931.4A CN107854771A (en) | 2017-04-21 | 2017-04-21 | A kind of adjustable pressure differential valve of surgery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710263931.4A CN107854771A (en) | 2017-04-21 | 2017-04-21 | A kind of adjustable pressure differential valve of surgery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107854771A true CN107854771A (en) | 2018-03-30 |
Family
ID=61699175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710263931.4A Pending CN107854771A (en) | 2017-04-21 | 2017-04-21 | A kind of adjustable pressure differential valve of surgery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107854771A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022087900A1 (en) * | 2020-10-28 | 2022-05-05 | Medtronic Xomed, Inc. | Flow regulating shunt valve |
-
2017
- 2017-04-21 CN CN201710263931.4A patent/CN107854771A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022087900A1 (en) * | 2020-10-28 | 2022-05-05 | Medtronic Xomed, Inc. | Flow regulating shunt valve |
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