CN1056088C - A deivce for regulating the flow of cerebrospinai fluid in a drainage circuit - Google Patents

Abstract

The present invention relates to a device for regulating the flow quantity of organic liquid in a drainage loop between a patient's generating site and a patient's absorbing site. The present invention comprises a valve, wherein the valve comprises a valve body, a component part (14) and a control device, the component part (14) is used for regulating the passed cross section, the control device comprises a first chamber (12) and a second chamber (6), a resilient device and a device for regulating restoring force and return force, and the resilient device makes the regulating component parts recovered to the position of closing the connection channel.

Description

The flow regulator in drainage of cerebrospinal fluid loop

The present invention relates to a kind of instrument that is used for regulating the flow of an artificial drainage loop organic liquid, this artificial drainage loop extends in patient on one's body between the generation position and absorption site of organic liquid.Cerebrospinal fluid can be derived or draw to one of main application of the present invention when producing hydrocephalus, for example no matter it is at intracranial or in the lumbar region.

The generation of this disease of hydrocephalus specifically, is blocked the causing of natural drainage channel owing to cerebrospinal fluid.Treat this disease, normally this cerebrospinal fluid is transported to an absorption site from the intracranial chamber or at the bottom of spinal column, specifically the peritoneum place by a bypass channel is installed.

This bypass channel comprises that one has the pipe of a flow control valve, and whole assembly places under patient's the skin.

There is the valve of several types can realize this function in the market.The simplest is unidirectional non-return valve.This valve all is made of a pipe that has otch promptly to cut seam, and when the pressure in this pipe surpassed the elastic force of the pipe that makes cut closure, it is wealthy that its otch just becomes, (this pressure must add or deduct the pressure of the pipe section that is positioned at above-mentioned valve downstream).It also has by a calibrating spring presses the valve member that makes it to be tight against on a valve seat, and the elastic force of this spring equals critical pressure value or the threshold value that valve is opened.

One of big defective of these valves is there is not adjusting device.And unfortunately, the characteristic of valve is will be with the difference of the inherent character of each patient's body tissue and different, and after the problem that characteristic must be adapted to each patient had solved, the characteristic of valve also needs can change or adjusting along with the variation of the state of an illness.No matter it is for the purpose of initial adjustment or for the needs of the development of the state of an illness,, all need to carry out surgical operation, because this valve is to plant below patient skin with an original valve of valve replacement with different qualities.

Therefore, people have developed the valve that can regulate.These valves comprise that one is tight against the spring of its valve seat with a valve member (bead), and the rated value of spring can be regulated from the outside and need not carry out surgical operation.There is one to be connected to control piece on the spring and it can rotate in valve housing.This control piece can play response and it to magnetic field and can see through skin and magnetically be coupled with an actuator that is used to change its position.These valves are more complicated all generally, and size and volume are also bigger, and its reliability is shady, and mistuning joint takes place easily for their when being given a shock.In addition, they also comprise metal parts, and metal parts is that the meeting generation is interferential when clapping X-ray.

Usually, because the valve of those patterns is all only used very little driving force, they are to be difficult to make.In addition, the stability of the operation of these valves also is very uncertain, because set up in valve after the drain, the balance of valve member or stability are very sensitive to the viscosity change of pressure and liquid.In addition, the valve height miniaturization of those patterns, thus can make their weak and easy damages that is highly brittle that becomes.

In addition, the valve of prior art changes under sizable situation in parameter works, and particularly parameter changes along with the variation of patient's position.Patient is when the standing place, and the pressure differential that cerebrospinal fluid generates between position and the absorption site may be up to the 400mm water column, and when lying prostrate state, pressure differential can be 0.In addition, the absolute pressure in the absolute value of pressure, particularly encephalocoele chamber is in standing state along with patient or lies prostrate state and change.(absolute pressure increases when lying prostrate state).In other words, from the angle of valve, it shows as its pressure of a position and changes greatly, and its pressure variation of another position is less, but compares with bigger variation and can not ignore.Because the pressure of opening of the valve of prior art is transferred lessly (between 50mm to the 150mm water column), the concrete pressure of opening is decided on the height of water column in the loop, valve may keep cutting out when patient lies prostrate, and when patient is in sitting posture, generally may stay open, but when patient stands, just excessive drain may be produced, thereby big encephalasthenia or collapse can be caused.

In the file of FR-A-2655535, disclosed a kind of valve of regulating drainage speed, it operates the influence of the pressure differential between the upstream and downstream both sides that are not present in valve member, yet this valve is difficult to be made and development, because it is all very high to the requirement of the accuracy of manufacture and manufactured materials.

The objective of the invention is to improve the defective of at present used valve, because the valve in using at present solves the over-drastic problem of drain unsatisfactorily, and the valve that is disclosed in the above-mentioned file never can come into the market because of making and developing difficulty again.

In addition, the design of valve of the present invention can make it comprise a pick off, thereby it can be according to patient's state.Come patient is monitored by obtaining the intracranial pressure value continuously or discontinuously, so just can cause the harmful effect generation that can't reverse owing to intracranial pressure is too high or too low before, promptly take measures.

For this reason, the invention provides the instrument of the organic liquid flow in a kind of generation position that is used for regulating patient and the drain loop between the absorption site, extend between two positions in this drain loop, a position has less pressure and changes, another position has bigger pressure and changes, particularly along with the variation of patient's position and change, this instrument comprise one be used to implant subcutaneous, and be connected to a position by one first conduit, be connected to the valve at another position by second conduit, described valve comprises that one constitutes the valve body of the inner passage of described two conduits of a connection, one is used to regulate described parts by the cross section, and one and described adjusting parts couplings so that regulate parts in the primary importance of closing passage with open the control device that moves between the second position of the scope that passage to controls, be characterized in: described control device comprises first chamber that is formed in the described valve body and cuts out in the mode of sealing by a barrier film, one second chamber that is formed in the described valve body and separates by barrier film and described first chamber, described second chamber forms the part of an inner passage and is connected with conduit from less pressure variation portion, device in order to be coupled this barrier film and this regulating part, with so that the adjusting portion part returns to its position of closing interface channel, and the elastic device that separates with described barrier film, and the device that is used to regulate described elastic device.

Because this basic configuration, even have position that less pressure changes one big area (the membranous area of described chamber) is arranged, thereby might on barrier film, produce a bigger power, be applied to the power that is used to regulate by on the regulating part in cross section thereby change by returning elastically part.Therefore, just may adopt one have one determined by structure itself, corresponding to a single valve of the acceptable operating point of a kind of situation of patient, make this single valve can provide another another kind of situation also can received operating point by the active force of regulating it for same patient.Two selected situations are exactly lying prostrate of patient and standing state, thereby guarantee this valve under physiologically acceptable state, also can suitably work when intermediary posture or situation.

In a preferred embodiment of the present invention, this valve body has one the 3rd Room, the another part that is connected to another supravasal inner passage leads to this chamber, the 3rd Room has the wall of an opening that is surrounded by valve seat by one and separates with second Room, and this regulating part then is a valve member that can move with respect to valve seat.

This barrier film can be the piston that slides in the cylinder-shaped hole that is formed in the part of the valve body that limits first Room, and it preferably includes a membranous ringwise flexible peripheral part of rigidity mid portion and that is connected to the valve member afterbody.

In another embodiment who slightly changes, valve member is directly connected to membranous rigid element, and these three chambers are stacked in valve body.But at another preferably among the embodiment, because it makes valve can make thinlyyer, wherein valve member is connected to membranous rigid element by a connecting rod, and the 3rd Room is arranged in the valve body, and its height is identical with the height of first Room.

It is very favorable that the elastic component that makes the valve member recovery prop up its valve seat is made a blade that is arranged on the elastomeric flexible in first Room.This blade has an one side that only is pressed against at two ends on the valve body strong point (one of them is that the position is adjustable), and the middle body of its another side only is pressed against the central authorities of membranous rigid element.

In a preferred embodiment, valve member is positioned at that side that is exposed to from the valve seat under the pressure at the absorbed position of organic liquid.Therefore, it carries out the function of a non-return, prevents that cerebrospinal fluid from generating the pollution that the position is subjected to absorption site.In addition, first chamber is answered full of liquid (passing through the diffusion of valve wall to prevent gas), and should comprise that one is subjected to the deformable wall (or part of wall) of external skin downforce.Because structure itself makes this chamber constitute a benchmark or reference body, it has constituted compensation automatically acts on one of pressure component on the barrier film opposite side owing to subcutaneous pressure means to the sensitivity of subcutaneous pressure.

In addition, the advantage of valve constitution of the present invention is to provide in fairly simple mode one to be used for measuring and monitor the device with position pressure that less pressure changes.

At it on the one side of first Room, membranous rigid element has a bossing, spring leaf is tight against on it, and, wherein be combined with an electric induction element, the characteristic of this electric induction element can induction blade and projection between contact force, said elements is connected on the coil and constitutes a passive oscillating circuit.In addition, this coil is arranged in first chamber, and after valve was implanted, its axis was basically perpendicular to patient's skin surface.

Therefore, this valve can with a pressure gauge collaborative work, described valve plays the effect of the passive element of a responder, this pick off then is an active component, and, comprise an oscillating circuit for this purpose, this oscillating circuit comprises a coil and an electric induction element identical with element in the valve, but be not subjected to stress, and send the variable magnetic field of a given reference frequency, and it is suitable for placing with valve is close; Also be useful on the device in the magnetic field that acceptance sent by the pressure sensing oscillating circuit that is combined in the valve, purpose is that reference frequency and the frequency of replying magnetic field are compared, therefrom can derive the mechanical stress on the electric induction element of the oscillating circuit that acts on valve, then this stress transmission be become the force value of cerebrospinal fluid.

Understand easily, a kind of like this instrument has very big advantage in that the patient who is in distress phase is observed and obtain data continuously, and can be after valve at ordinary times is implanted in order to patient is monitored so that its running parameter obtains the optimum adjustment this point also is very favourable.

Other characteristics of the present invention and advantage from following to obtaining clearer understanding the description of each embodiment.

Fig. 1 is the sectional view of a valve of simplifying, and is used for illustrating how it works;

Fig. 2 is the sectional view that is positioned at perpendicular on the planar plane of Fig. 1, similarly cut one and be used for the valve that illustration purpose is simplified, but it represents a preferred embodiment of the present invention;

Fig. 3,4,5 and 6 is that Fig. 3 and 5 is respectively the sectional view along III-III in Fig. 4 and 6 and V-V line by the view of the specific embodiment of valve of the present invention, Fig. 4 and 6 is the outside drawing of valve of the present invention;

Fig. 7 is for by a schematic section that the valve of passive balise element is housed;

Fig. 8 is the sketch map that is used to measure and monitor a system of the present invention of intracranial pressure.

Comprise that with the valve of the present invention shown in the section form one is connected to a conduit 3 by aperture 2 among Fig. 1, be connected to the valve body 1 of conduit 5 by aperture 4.Aperture 2 leads to and is formed in the valve body 1 and has in the chamber 6 of a barrier film 7.This barrier film comprises that a rigidity mid portion is 8 and one cyclic, mid portion is connected to the deformable flexible barrier film 9 on the sidewall of chamber 6.Facing to barrier film 7, chamber 6 is limited by a wall 10 with an aperture 11.Barrier film 7 also limits with valve body 1 or forms a chamber 12, and to be full of pressure in the chamber 12 be atmospheric liquid.The wall that constitutes the valve body 1 relative with barrier film of chamber 12 comprises a flexible portion 1a, thereby the outer pressure of valve body can be passed in the chamber 12.

Being formed on aperture 11 on the wall 10 is communicated with chambers 6 and is formed in the valve body and leads to the 3rd chamber 13 of conduit 5.In the example of Fig. 1, barrier film 7 directly is equipped with the valve member 14 that can close aperture 11, and the edge of aperture 11 constitutes the valve seat of valve member 14, and has any material that good valve seat is provided for the valve member that is in primary importance that is suitable for.Valve member 14 is fixed on the above-mentioned membranous rigid element 8, and its position with respect to valve seat has just formed between chamber 6 and 13 passes through the cross section.The working portion of this valve member is more much smaller than being subjected to being present in chamber 12 and 6 the membranous area of pressure, thereby has reduced the influence that the pressure in the chamber 13 moves barrier film.

In addition, valve of the present invention comprises that one is used for valve member 14 is tight against elastic component on it.This elastic component places the soft blade 17 of elasticity of chamber 12 to constitute by one, this soft blade 17 is bearing on the valve body by the mode with simple (or hinged) of one end 17a, and be bearing on adjustable strong point in simple mode by its other end 17b, this strong point is made of the screw 18 that its head can touch outside valve body.In the centre of its another side, blade 17 is against on the bossing 19, and this bossing 19 is contained on the rigid element 8 of opposite side of installation valve member one side of barrier film 7.In a unshowned embodiment, this bossing can place the globule of the little recess on the blade 17 to be replaced by one, and is tight against the rigid element 8 of barrier film 9.

The structure of valve, work and regulate as follows:

Barrier film 9 and spring 17 are installed in the valve body 1, chamber 12 fulls of liquid, and to satisfy the requirement of following first time of test: the liquid stream of carrying a fixed flow rate to valve by aperture 2 is (for example: 10 centimetres ³/ hour), and regulating spring 17, so that the liquid of input flows to aperture 4 from aperture 2 under atmosphere pressure state.Then, aperture 4 is connected on the conduit, in chamber 13, sets up the vacuum of about 300mm water column, and measure the pressure in the chamber 6.This pressure must be born (vacuum) some (for example, at the 0mm water column between-100mm the water column).The valve that can not satisfy this first test index on any structure all can not use.

, regulate thereafter, promptly adjustment screw 18 so that valve member move to its seat, make when the pressure in the chamber 13 be approximately-during the 300mm water column, the pressure in the chamber 6 is actual to be 0, (that is, equaling atmospheric pressure) and flow velocity continues as 10 centimetres ³/ hour.After this, this valve just can be implanted the usefulness for first kind of application, promptly as in a drainage catheter that extends between the ventricles of the brain (cerebrospinal fluid generation position) and a peritoneum absorption site.This implanted valve working condition is as follows.Suppose that valve institute's determined value in its structured testing is-50mm water column, and suppose that it is to be used to have on one's body the patient of such physiological data, when promptly this patient lies prostrate, pressure in the chamber is the 50mm water column, when it was stood, the pressure in the chamber was 0 substantially, and average cerebrospinal fluid flow velocity is 10 centimetres ³/ hour.

Therefore, when this patient stood, the pressure in the chamber 6 was 0, and the pressure in the ventricles of the brain 13 is-the 300mm water column that with the same in the adjustment process, the transporting velocity of valve is 10 centimetres ³/ hour.The fluctuation of pressure causes the position of valve member 14 to be arrived above-mentioned surge pressure by SERVO CONTROL in the chamber.If pressure descends, spring 17 is pushed valve member to its valve seat, and flow velocity reduces, the pressure of chamber rise gradually until it on the occasion of.In this case, barrier film will make valve member move apart valve seat, and the flow velocity unlifting pressure descends like this.

When patient lay prostrate, the pressure of chamber was the value of 50mm water column, and the pressure in the chamber 13 is 0 substantially simultaneously.In the case, because barrier film 9 makes valve member 14 move apart its valve seat, even the pressure differential when this pressure makes the pressure differential that increases the flow velocity chamber 6 that makes by aperture 11 and 13 fully by the cross section stand than patient also can keep constant when much smaller.

Therefore, suitably drain of valve of the present invention, it is excessive that drain takes place in the time of can not occurring in the standing place, also choking phenomenon can not take place lying prostrate the position.We can say that in this application, from the viewpoint of measures of valve, having the position that big pressure changes (300mm water column) is absorption site, and have position that less pressure changes (50mm water column) for generating the position.

On structure, valve shown in Figure 1 also is suitable for second kind " waist peritoneum " and uses.It is that the lumbar region (generation position) of cerebrospinal fluid from spinal column drained into the peritoneum zone (absorption site).

In the case, the structure of valve must lead to followingly excessively test condition (for example, adopting value as before):

Under atmospheric pressure the liquid stream with a fixed flow rate is transported to valve by aperture 4, and is provided with spring to such an extent that make liquid leave Shi Buhui by aperture 2 to be added to mouth pressure 4;

Thereafter, aperture 4 connects a conduit and rises to the 500mm water column to make pressure in the porch from the 400mm water column, and in chamber 6 pressure negative value (the 50mm water column is to the 100mm water column) slightly still under the identical situation of flow velocity.

Thereafter, to make the pressure in the chamber 6 be 0 to adjustment screw 18 substantially.

Waist peritoneum valve of Gou Chenging such as following mode are worked by this way.When patient stood, valve was carried as is had the liquid of 400mm water column to the inlet pressure of 500mm water column during test.When lying prostrate the position, pressure in the chamber 6 rises, and makes valve member 14 move apart its valve seat, thereby increases the cross section of pass through of liquid, and this liquid is in zero inlet pressure substantially, and it need not overcome any loss in head when mobile but make nature.

In the waist peritoneum was used, from the viewpoint of measures of valve, absorption site has less pressure to be changed, and has bigger pressure variation and generate the position.

Fig. 2 shows above-described a part of parts (numbering same Fig. 1).In this embodiment, barrier film 9 does not well have elastic hardness.(binding agent, the ultrasonic bonding in any suitable manner of this barrier film ...) be fixed on chamber wall and the middle body, chamber 6,12, the surface of the wall of the surface of all walls of 13 and aperture 2 and 4 all uses known processing mode to cover carbon, thereby cracking is an acetylene atmosphere under vacuum state.In the case, valve member 14 is connected to one and is fixed on the connecting rod 15 of rigidity middle body 8 of barrier film 7, and an end 16 of above-mentioned connecting rod 15 is bearing on the valve body 1 simply or in the mode of a hinge, and this end 16 is opposite with that end that valve member 14 is housed.The existence of this connecting rod has two advantages.At first, it makes chamber 13 and chamber 12 can place sustained height, thereby compares with embodiment illustrated in fig. 1, can reduce the height of valve of the present invention, and this can see more definitely from following numeral.In addition, this connecting rod can make the displacement of barrier film 7 amplify concerning valve member, thereby, can promptly on valve seat, obtain a bigger cross section of passing through.In addition, in the present embodiment, valve member 14 is installed to such an extent that can play check-valves.Be appreciated that differently with the structure of Fig. 1, be connected to the application of aperture 4 for absorption site, it is opened in mobile direction.Any reverse flowing all will impel it to be tight against on its seat.The sensitivity of this effect can be provided with the gap along valve member by the junction between connecting rod 15 and valve member 14 and be improved.

In Fig. 2, be used for the elastic component that valve member 14 is tight against on it is occurred with the form of a stiff spring 21, this spring places chamber 6, therefore can regulate by moving its junction point 22.In this figure, the device of the position of regulating this Connection Element 22 is not shown.

In this figure, it can also be seen that the part of a deformable wall 1a, it can make the pressure in the chamber 12 equate with patient's subcutaneous pressure.The advantage of this set is that it can eliminate the variation of the pressure on the barrier film that acts in the chamber 6, and this pressure changes and only is because patient's subcutaneous pressure variation causes.

Fig. 3 to 6 shows the more actual valve of a kind of structure of the present invention.All the label with several the figure in front is identical for the numbering of most of components in these accompanying drawings.Here, valve body has ovate-oblong shape, it be use with biology compatibility synthetic material make, and a midfeather 23 with a central aperture of being closed by barrier film 7 is arranged, above-mentioned wall 23 separates chamber 6 and chamber 12.By same and also being limited by the lid shown in the label 30,31 respectively that biology, compatible material was made, the inner surface of lid is covered with carbon to two chambers 6 and 12 similarly together with valve body 1.This covers available any suitable mode and places on the valve body.One end 16 of connecting rod 15 is articulated in and covers on 30 the boss 32, and its other end is the shape of jaw 33, the afterbody cooperation of it and valve member 14, thus under the effect of the motive force of the spring leaf 17 that the membranous rigid element 8 by bossing 19 and connecting rod 15 is transmitted, it is tight against on its seat.Can the sensitivity that valve is improved in the gap be set by the afterbody along valve member in the connection between connecting rod 15 and valve member 14.Having under the situation that makes fluid turn back to the buffer brake that generates the position from absorption site, connecting rod is removed and shut off valve under the influence of reverse flow from seat.Fig. 4 represents that from Fig. 3 along the being seen valve of F line, the lid 30 among the figure has been removed.

Fig. 6 is along the being seen view of G line among Fig. 3, and lid 30 has also been removed.Therefrom as seen, slinky spring blade 17 is tiltedly to wear connecting rod 15 and be provided with, boss 34 collaborative works of above-mentioned blade 17 and screw 18 and connecting rod 31.When screw 18 is unscrewed, blade 17 be forced to be against the rigid element 8 that is fixed in barrier film 7 bossing 9 above.Otherwise when screw 18 was turned inwardly, spring leaf 17 was released.Fig. 5 is a sectional view by the valve of Fig. 6 center line V-V, that is, along one along spring leaf 17 cross sectional view of line longitudinally.

At last, in Fig. 3 and 4, the shape of visible wall part 1a, that is, one on can closing cap 30 aperture have a hollow plug through accurately machined wall.

Fig. 7 is a sectional view identical with Fig. 5, and it is the sectional view by the embodiment that another changes to some extent of the present invention, and this embodiment can make the flow rate regulating valve can also be as an instrument that is used for measuring and observe the pressure of intracranial cerebrospinal fluid.Except described and in Fig. 7 with those parts shown in the same numeral, for the pick off that provides can detect intracranial pressure, this valve also comprises an oscillating circuit, this circuit comprises: a coil 35; One element 36 that constitutes by quartz crystal in the present embodiment, it is arranged on membranous rigid element 8 and is bearing between the bossing on the spring leaf 17, and has a resonant frequency that has functional relation and change with suffered compression stress; Also has the reference crystal 36a of pressurized not.Perhaps, element 36 also can place the deformeter on the face of spring leaf 17 to constitute by one.Like this, this loop just will constitute a relaxation oscillator.The characteristic that changes with the pressure of chamber 12 that is appreciated that element 36 will make the resonant frequency of oscillating circuit change.

Be combined in oscillating circuit in the valve of the present invention and constituted the passive component of a responder, the active parts of this responder is made of an activator oscillation circuit with a coil 37.Fig. 8 shows this active parts that is installed on the electrode 39, and this electrode 39 can place near the position of the valve of the present invention under implanted patient's the skin 40.Produced the magnetic field that preset frequency arranged after oscillation circuit 37 is energized, it will induce an electric current in the passive oscillation circuit in valve, and the frequency of this electric current is the function of the difference between the strain regime of element 36 and 36a.Faradic current after the modulation can be responded by the magnetic field that electrode 39 receives or answer by producing one by this way, and this magnetic field has a beat frequency, and it is representing the strain regime of crystal 36.In order to ensure the coupling of the maximum magnetic flux between active and the passive oscillation loop, coil must be parallel to each other, so the axis of coil 35 must be perpendicular to patient skin when valve is implanted.

Certainly, active and passive oscillation loop comprises the electric induction element, they are not described at this, but they all is well-known, for example capacitor and transistor etc.

The output 41 of electrode 39 send by transmit and response signal between the beat frequency that frequency difference produced, this difference on the frequency can transmit and handle by a microprocessor 42, thereby can observe and follow the tracks of the variation of pressure.

Fig. 8 shows the microprocessor 43 with a memorizer 44 and printer 45, and it can be used for observing a plurality of patients that pick off of the present invention is housed respectively.It can also be connected to the output 41 of responder on the one portable monitor, suitably works making it in order to check and the valve implanted of monitoring.

The above-mentioned parts of carrying can be made of any suitable valve member.Specifically, it can support thereon bead by two relative springs by one, acts on the spring leaf 17 at membranous rigidity position, and by make act on the direction of spring load make on the bead that valve member opens connecting rod 15 form.

The present invention also can be used for other organic fluid, for example the artificial drainage of ascites (serosity of peritoneum).

Claims (16)

1. the instrument of the organic liquid flow in generation position that is used for regulating patient and the drain loop between the absorption site, extend between two positions in this drain loop, a position has less pressure and changes, another position has bigger pressure and changes, particularly along with the variation of patient's position and change, this instrument comprise one be used to implant subcutaneous, and be connected to a position by one first conduit, be connected to the valve at another position by second conduit, described valve comprises that one constitutes the valve body (1) of the inner passage of described two conduits of a connection, one is used to regulate described parts by the cross section (14), and one and described adjusting parts (14) couplings so that regulate parts (14) in the primary importance of closing passage with open the control device (7 that moves between the second position of the scope that passage to controls, 15), it is characterized in that: described control device comprises first chamber (12) that is formed in the described valve body (1) and cuts out in the mode of sealing by a barrier film (7), one is formed on second chamber (6) that also separates by barrier film (7) and described first chamber in the described valve body, described second chamber forms the part (2) of an inner passage and is connected with conduit (3) from less pressure variation portion, device in order to be coupled this barrier film (7) and this regulating part (14), with so that the adjusting portion part returns to its position of closing interface channel, and the elastic device (17 that separates with described barrier film, 21), and the device that is used to regulate described elastic device.

2. instrument as claimed in claim 1, it is characterized in that, described valve body has one the 3rd chamber (13), be used to constitute the another part (4) that is connected to from the inner passage of described conduit with big pressure changing unit, described chamber has the wall (10) of an opening (11) that is surrounded by valve seat by one and separates with described second chamber, and described regulating part (14) is a valve member that can move relative to described valve seat.

3. instrument as claimed in claim 2 is characterized in that, described barrier film (7) comprises that one is used for being connected to the rigidity middle body (8) on the described valve rod of described valve member (14), and a soft peripheral part (9).

4. instrument as claimed in claim 3 is characterized in that, described valve member (14) is connected directly to the rigid element (8) of described barrier film (7), and described three chambers (12,6,13) are stacked in the valve body (1) of described valve.

5. instrument as claimed in claim 3 is characterized in that, described valve member (14) is connected to the rigid element (8) of described barrier film (7) by a connecting rod (15), and described the 3rd chamber (13) is identical with the height of first chamber (12) in valve body.

6. instrument as claimed in claim 3 is characterized in that, described elastic recovery part (17) is arranged in described first chamber (12), and with rigid element (8) co-operating of described barrier film (7).

7. instrument as claimed in claim 2 is characterized in that, this valve member (14) is positioned at that side that is exposed to from the valve seat under the pressure of organic liquor absorption site.

8. instrument as claimed in claim 1 is characterized in that, the described first chamber full of liquid, and comprise the deformable wall of bearing external pressure.

9. instrument as claimed in claim 6, it is characterized in that, being used to make described valve member (14) to return the described elastic component (17) that leans against on it is the soft blade of an elasticity (17), its one side rests on the strong point of described valve body (1) (34 with plain mode at its two ends, 20), the mid portion of its another side leans against with plain mode on the central part (19) of rigid element (8) of described barrier film (7), and one position (20) in two strong points of valve body (1) can be regulated on the direction perpendicular to described blade (17) face.

10. instrument as claimed in claim 9, it is characterized in that, described adjustable support point by with valve body (1) in screwed hole one work and the tail end that stretches into the screw (1 8) in described first chamber (12) constitutes, the front end of described screw can be from the outside of the valve body (1) of described valve (11) in addition turn.

11. instrument as claimed in claim 9, it is characterized in that, the rigid element (8) of described barrier film (7) has a bossing at it on the face of described first chamber (12), described spring leaf (17) is tight against on it, and it comprises an electric induction element (36), this element can be responded to contact force between described blade and the described projection, and described element is connected on the coil (35), forms a passive oscillation circuit.

12. instrument as claimed in claim 11 is characterized in that, described coil (35) is arranged in described first chamber (12), and when described valve was implanted, its axis was basically perpendicular to patient's skin (40) surface.

13. instrument as claimed in claim 11 is characterized in that, described electric induction element (36) is a quartz crystal that is located between described rigid element of barrier film and described projection (19).

14. instrument as claimed in claim 11 is characterized in that, described electric induction element is one to be positioned over the deformeter on the described spring leaf (17).

15. instrument as claimed in claim 1 is characterized in that, described body internal surface near the place, inner passage is covered by carbon.

16. instrument as claimed in claim 11, it is characterized in that, also comprise an oscillation circuit, this oscillation circuit comprise a coil (37) with one with the identical electrical equipment (38) of element in the described valve, described electrical equipment (38), be not subjected to stress, be used for producing one and have the variable electromagnetic field of set reference frequency, and be suitable for placing described valve near; Also comprise the receptor oscillation circuit (35 that is used for receiving by being combined in the described valve, 36) device in the magnetic field that is produced, compare in order to frequency reference frequency and response magnetic field, thereby derive the described oscillation circuit (35 in the valve, 36) mechanical stress that electrical equipment is suffered, and the value that described stress transmission is become cerebrospinal pressure.

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