VALVE FOR A FLUID, IN PARTICULAR FOR USE IN A MECHANICALLY CLAIMANT HYDRAULIC PUMP

Mechanically claimant hydraulic pump

B e s C h r e i b u n g

The invention concerns a mechanically operated hydraulic pump, in particular for medical or nourish-physiological liquids, as well as liquids in the biological and laboratory range, with a housing and in this flexible element held and expandable for storing and delivering the liquid, furthermore with a lockable entrance for the liquid to the flexible element, an outlet for the liquid from the flexible element and a mechanism to large constant stops and/or limiting of the liquid flow rate spent by the flexible element.

In connection with the promotion of medical, nourish-physiological or biological liquids or liquids within the laboratory range are used the most different types by hydraulic pumps. There is for example electricalenergetically, electro-chemically, gaseously, mechanically, electromechanically and mechanical-physically operated pumps well-known. Many of these pumps can be used and offered in all rule only after a longer starting time the user and consumer often only an insufficient dosing accuracy. The well-known pump systems are in all other respects quite costly and under ecological criterion little favourable. They cannot be often used by the user portable. Mechanically claimant hydraulic pumps are characterised by a drive, which can be arranged quite simple in all rule. Like that are the different execution forms admits become, with which expandable flexible elements find for storing and delivering the liquid use.

A mechanically operated hydraulic pump, in particular for medical or nourish-physiological liquids is well-known from the EP 0,944,405 B1. With this the expandable flexible element is designed as hose. This is arranged within a pipe, which is locked by means of a stationary end cap in the range of an end. In this end cap the hose with its is sealed stored open end. Into the hose end leads a line, which intersperses the end cap. Turned away this end cap is stored in the pipe a further end cap relocatable, those the hose within the range of its different one, open end takes up. There the hose is stored, thus sealed accordingly in this relocatable end cap, and it is through put and into the hose in-led a line by this end cap. That the mobile end cap assigned line is assigned a valve, by which the liquid can into the hose influxes, whereby the hose is stretched, until it rests against the inner wall of the pipe. Due to the stretch of the hose also the mobile end cap is moved away from the stationary end cap. Under the flexible resetting force of the hose, which works radially inward, the liquid is exhausted by those the stationalen end cap assigned line to the patient.

Such an organization of the mechanically operated hydraulic pump is complex, because a flexible element finds within a hose use, which exhibits thus two diametric openings, to which separate lines - one with the function of the entrance, which others with the function of the outlet - are assigned. Foreseen of it the liquid can be delivered not completely from the hose and supplied thus to the patient by means of the hose, because with increasing approach of the hose walls in consequence the flexible resetting forces of the hose leave delivery of the liquid at the patients. Finally the hose expands radially evenly outward, until it rests against the inner wall of the pipe. Due to the default of the rotationally symmetric organization of the pipe an unfavorable dimension of the pump is given in width depth extending. It can do thus none low rise building-ends pump due to the training of the flexible element in kind of a hose to be represented. The sealing of the hose is complex, since it has to take place in two places.

One arranges, mechanically operated hydraulic pump similar is descriptive in the EP 0,424,994 B1.

There is mechanically operated hydraulic pumps, in particular for medical or nourish-physiological liquids admits become, with which a bag finds for the admission of the liquid use, whereby a line connected with the bag serves the liquid from the bag, in the bag, for the expenditure. The bag cooperates with a mechanism for exercising a thrust force on the bag for expenditure of the liquid from this. The mechanism proves a flexible element for effect on a bag side as well as a further element for effect on the opposite bag side up. Such a hydraulic pump is descriptive in the DE 199 28 131 A1. Similar mechanically operated hydraulic pumps, which are based on this effect principle, are descriptive in the DE 100 63 975 A1 and DE 100 58 121 A1.

In the DE-OS 27 01 100 a pump is descriptive, which finds in particular in the area of the chromatography use. With this a liquid, for example a Eluiermittel, is driven out by supply of a compressed gas. The pump exhibits a flexible container in form of a schlauchförmigen diaphragm, which at an end with a c-clamp is sealed. Sealed a pipe surrounds the hose, with which an area between this and the hose is formed. With chromatographischen application imported nitrogen presses that into this area

Hose together, whereby the entire Eluiermittel or some of it is discharged and pressed by a chromatographische column.

Task of the invention is it to train a mechanically operated hydraulic pump further in such a way the entrance kind mentioned that with simple organization of the drive of the pump a complete expenditure of the liquid is ensured.

The task is solved with a hydraulic pump the entrance kind mentioned by v the following characteristics: the flexible element is as balloon trained, which is provided with an opening, in the housing is stored a core, which is imported into these by the opening of the balloon, - there is means for fastening and sealing the balloon in the range of its opening of exhibiting end at the core or at the housing intended, in distance from its attachment rests the balloon, with relatively eased condition, against the core.

The drive of the mechanically operated hydraulic pump according to invention is characterised already by it in special way that the flexible element is designed as balloon. It concerns thus a flexible element, which is provided with only one opening. Therefore this opening serves both and entrance for the liquid and outlet for the liquid. A further characteristic is to be seen in the fact that with the balloon a core cooperates, which is imported into these by the opening of the balloon. The balloon rests in relatively eased condition against the core. By this it is to be understood that the balloon can quite rest with a certain pre-loading against the core, since the complete emptying of the balloon is to be aimed at. Is fastened and sealed the balloon exclusive within the range of its opening of exhibiting end. This takes place preferably directly at the core. It is just as conceivable to plan the attachment and sealing of the balloon at the housing.

The balloon can be in principle from each material formed, which exhibits the necessary elasticity for storing and delivering the liquid. As preferential material silicone is regarded. It is in particular meant of a capacity of the balloon from 10 ml to 150 ml.

With the hydraulic pump it is regarded as particularly important that this is relatively flat trained, since she is carried directly in all rule by a patient at the body. A hydraulic pump some circular diameter exhibits, is a little favourable under this aspect. In order to preferably reach an expansion of the balloon less in width extending and in its height, a further training of the invention plans that the balloon in a first extending direction perpendicularly to the longitudinal axis of the core and in a second extending direction exhibits relatively thick wall sections perpendicularly to the longitudinal axis of the core and perpendicularly relative to the first extending direction thin wall sections. That means that the balloon deforms more strongly within the range of the thin wall sections, with which in the case of stretching the element one essentially results to the form of a Elypse approximate shape of section. The balloon is in particular manufactured by injection moulding.

In accordance with a preferential further training of the invention intended that with the housing a hood is connectable, in particular one is in the cross section, thus seen transverse to the longitudinal axis of the core, nierenförmig arranged hood is connectable. Within this hood the balloon is arranged. By the nierenförmige organization of the hood this can match the contour favorably the body outline of the carrying within the range its hip, the pump. The balloon arranged with different thick wall sections follows the internal contour of the thin-walled arranged nierenförmigen hood with expanding approximately. When sufficient filling the balloon with liquid this can set itself on the inner wall of the hood. The width/elevator relationship of the hood is relatively large, it amounts to preferably 1, 5: 1 to 3:1, in particular approximately 2: 1. The hood is preferably inseparably tie-clipable with the housing.

With a preferential organization the core is rotationally symmetrically trained, in particular cylindrical. It exhibits thus, apart from a possible Verdickung within the connecting range to the housing, a continuous diameter. Accordingly the balloon in relaxed condition, thus then, exhibits if it is positioned independently of the core, also cylinder form, whereby the diameter of the cylinder is smaller than the diameter of the core, related to which range of the core, with which the balloon in relatively eased condition arrives at the plant. It is regarded as particularly favourable, if the balloon is completely put onable on the core, so that then no more liquid is between balloon and core. To the liquid into the balloon and spending the liquid from the balloon can the core would bring in different way be arranged. Preferably a channel, the component of the entrance and the outlet intersperses the core forms. The channel intersperses the core in particular in its longitudinal axis and in its radial direction. On the basis of the range of the channel running in the longitudinal axle center liquid can arrive into the radial sections of this channel, with which by these axially and radially running channel sections a connection to the inside of the balloon is guaranteed. The length diameter relationship of the core amounts to 3:1 to 8:1, in particular 5:1 to 6: 1.

The means for fastening and sealing the balloon are preferably designed as case, which, with balloon, wedges this drawn up on the core between the case and the core.

Further characteristics of the invention are represented in the Unteransprüchen, the description of the figures as well as the figures themselves, whereby it is noticed that all single characteristics and all combinations of single characteristics are invention substantial.

In the figures the invention is for example represented on the basis an execution form, without being on that limited. It shows:

Figure 1 an explosion representation of the mechanically operated hydraulic pump according to invention,

Figure 2 a vertical longitudinal middle section by in figure 1 the pump shown, with balloon resting against the core,

Figure 3 a cut in accordance with figure 2, with balloon filled with liquid,

Figure 4 a vertical profile by in figure 1 the pump shown, in distance to the longitudinal axle center of the pump, in the range of a valve of the pump cut, figure 5 a cut, straight through the pump cut, within the range of the valve, illustrated in figure 1,

Figure 6 a horizontal longitudinal middle section by in figure 1 the pump shown, with balloon resting against the core,

Figure 7 a cut in accordance with figure 6, with balloon filled with liquid,

Figure 8 a cut by the pump, crosswise cut within the range of the storage of the core,

Figure 9 a cut by the pump, crosswise cut within the range not of the stored section of the core and the balloon filled with liquid,

Figure 10 an increased sectional view from core, balloon and locking ring to connecting balloon and core, with balloon resting against the core,

Figure 11 a cut, transverse to the longitudinal extending of the core cut, by the core and the balloon, with balloon resting against the core,

Figure 12 a sectional view in accordance with figure 11 for a modified shape of section of the balloon,

Figure 13 an increased sectional view of the valve shown in figure 4, and

Figure 14 a chart for the elucidation of the effect principle of the mechanically operated hydraulic pump with indication physical dimension.

In figure the 1 illustrated mechanically operated hydraulic pump 1 serves in particular the application of medical or nourish-physiological liquids, for example the application of a liquid medicine. The pump 1 exhibits a multipart housing 2, which by a center section is formed 3, with this cooperating upper section 4 and lower part 5, an overhead panel 6 cooperating with the upper section and a lower shell 7 cooperating with the lower part 5.

The center section 3 is provided on its top side with to the free edge of the center section 3 open recess 8 semicircular in the cross section and the upper section 4 in the appropriate boundary region on its lower surface with an appropriate semicircular recess 9. With the center section the two recesses 8 and 9 a circular cross section form 3 connected upper section 4 for the admission of a konusförmig extended final range 10 of a core 11. This exhibits, apart from its final range 10, a constant outside diameter. This cylindrical section of the core 11 is named the reference number 12. A channel 13 intersperses the core 11 in its longitudinal axle center (see yourself to figure 2) of that several radial by the core of 11 extending channels 14 within the range of the section 12 branches (figure 6). In the range of the outside range of the core 10 the radial channels 14 flow into circulating slots 15 of the core 11.

With the core 11 a flexible element cooperates that as from silicone existing balloon 16 is designed. This is manufactured in the injection moulding procedure. The balloon exhibits a conical extended final range 17 with opening 17a and one according to the final range 10 of the core 11 the outside form of the section 12 of the core 11 appropriate section 18, which causes balloon into that, closed final range 19 flows itself, which is turned away the final range 17.

Dimensions of core 11 and balloon 16 are so limited that, as it is to be taken from the figure 2, to which on the core 11 attached balloon rests completely against the core 11, thus the final range 17 of the balloon the final range 10 of the core contacted and the section 18 of the balloon 16 contacts the section 12 of the core 11 finally the final range 19 of the balloon 16 against the front side free end of the core 11 rests. The dimensions of the balloon 16 concerning the core 11 are here in such a way selected that the balloon 16 with relatively small pre-loading rests, thus in relatively eased condition against the core 11. For fastening the balloon 16 within the range of its final range 17 at the core of 11 within the range its final range 10 a locking ring 20 is intended, which is attached outside to the balloon 16 within the range of its final range 17. In such a way created thing is connected 4 with the center section 3 to the upper section with the locking ring 20 inserted into the recess 8 of the center section 3, afterwards, with which the locking ring 20 and thus the core 11 as well as the balloon 16 are firmly in the recesses 8 and 9 of center section 3 and upper section 4 held. The recesses 8 and 9 exhibit themselves a conical admission for the locking ring 20, away extending of the respective free edge of the center section 3 and/or upper section 4, in order to ensure a safe stop of the locking ring 20.

The center section 3, the upper section the 4 and the lower part the 5 serve the admission of further functional elements of the pump 1:

With the upper section 4 a LuerLock valve 21 is connected that an opening intersperses 22 in the upper section 4 and possesses, as it is to be inferred purchase taken description of the figure 2 in the following from that a LuerLock valve housing 23 and a LuerLockVentilkern 24. Over a channel 25 the LuerLock valve 21 with a channel 26 stands in connection, between the upper section 4 and the center section 3 is formed for which and which stand with the core 11 interspersing channel 13 in connection.

By the LuerLock valve 31 and the channels 25, 26 and 13 the pump with liquid is filled. On the basis of in figure 2 illustrated unbefüllten condition stretches with increasing addition of liquid the balloon 16 in that range, that not with the locking ring 20 is wedged and does not accept the end form illustrated in figure 3 with complete filling. The area, which is taken by the liquid, is there named the reference number 27. It is to be taken from the figures 2, 3 and 6 to 12 that the balloon 16 changes, on the basis of its starting situation resting against the core 11 when filling with liquid its form both in longitudinal direction of the core and in its transverse directions, i.e. in a first transverse direction and senkrechten seen for this a second transverse direction.

The upper section the 4 and the lower part the 5 are provided with rest projections/leads 28, which arranged the admission of one in the cross section hood 29 approximately nierenförmig serve. This hood possesses, like it descriptive from the figure 9 to infer is, an extending in width direction, which is substantially larger than in elevator direction. The width/elevator relationship amounts to for example 2: 1. The length/elevator relationship of the hood 29 is, like it for example from the figure 2 to infer is, approximately 2,5: 1. The hood 29 is preferably inseparably verclipst with the housing 2. With completely balloon filled with liquid this takes 16 as much as possible from the interior of the hood 29.

This is obtained because, as it is to be taken 11 for the balloon 16 resting against the core 11 from the representation of the figure the balloon exhibits 16 in a first extending direction X perpendicularly to the longitudinal axis of the core of 11 relatively thick wall sections 30 and in a second extending direction Y perpendicularly to the longitudinal axis of the core of 11 and perpendicularly to the first extending direction X relatively thin wall sections 31. Therefore the balloon 16 has to expand when bringing liquid into its area 27 the tendency preferentially in extending direction X, with which the expanded oval cross-sectional shape, how it is illustrated in the representation of the figure 9, results. Altogether the pump presents itself 1 as flat, favorably functional part which can be carried at the body, whereby the balloon 16 in condition filled with liquid takes also a flat form, which is adapted to the outside outline of the pump 1.

The channels 26 and 13 do not only serve supplying the liquid of the LuerLockVentil 21 into the balloon 16, but also would drive off the liquid from the inside of the balloon 16 to the patient. Like that the channel 26 is extended over the entrance place of the channel 25 outside to in the center section 3 and a valve 32 stored in the upper section 4 for limiting the liquid flow rate spent by the balloon 16. This valve 32 is formed by one edge-laterally between center section 3 and upper section 4 flexible valve diaphragm held 33, with this cooperating valve core 34, itself a compression spring 35 supporting on the valve diaphragm 33 and the upper section 4 and a set screw 36, which are bringable in effect connection with the valve diaphragm 33, stored in a thread of the upper section 4.

As is to be taken 13 from the representation of the figure in the detail, the channel 26 flows into a radially running channel 37 of the valve diaphragm 33 and from there into a radial channel 38 of the valve body 34, which flows into an axial channel 39 of the valve core 34. This channel 39 is openly trained in the range of its, a strengthened section 40 of the valve diaphragm 33 of turned end. On that the channel 39 turned away side of the section 40, to which the function of a catch element comes, an attack, which is designed as set screw 36, is arranged. In principle this attack could be also stationary. Between the projections/leads 41 of the valve diaphragm 33 the valve core 34 axially non-relocatable concerning the valve diaphragm 33 is held and im Übrigen also concerning these not swivelling.

The valve 32 serves closing the volume stream with requests of a too high pressure. In the valve two separate chambers 42 and 43 are formed, which are interconnected to interspersing, parallel to the channel 40 arranged channel 44 by the valve core 34. The chamber serves 42, which in direction of flow to the entrance, so to the channel 26 lies, as check chamber. The chamber 43 lies in direction of flow to the outlet 45. For filtering the liquid spent by the valve 32 a filter 46 is intended, which is edge-laterally between the center section 3 and the lower part 5 wedged. On the basis of the chamber 43 and the outlet 45 the liquid arrives at a channel 47 (figure 5) and from there for a LuerLock connection 48, held standing with the outlet 45 in flow connection, between the center section 3 and the lower part 5. With this a Luer LOCK link 49 is connectable, which is provided with a hose 50, which leads to the patient.

As is to be taken 5 from the representation of the figure, a glass capillary 53 is assigned into the channel 47. This represents a flow limiter, which is able, the flow rate, which withdraws by the channel 47 from the pump to limit because the flow limiter exhibits a smaller cross section, as the channel 37 lying in the entrance. By the choice of different flow limiters the attitude of different constant flow rates is possible, as long as the entrance of the entrance lying close pressure does not fall below a certain value. In principle it is intended that the flow cross-section of the entrance is larger than the flow cross-section of the outlet. Of course the flow limiter can be differently implemented, than in kind of a glass capillary. It is quite conceivably, behind the valve in the outlet of the pump, for example a Mäander chip, which limits the flow, to plan. Due to indicated the diameters of the channels, those the area 27 of the balloon with the valve 32 and the diameter of the channels arranged behind the valve 32 as the flow limiter 53, is the resistance, which the channel 47 with the flow limiter 53 opposes to the Auströmen of the liquid from the housing 2, connects more largely than the resistance, which is against set for the liquid with influxes into the valve 32.

In a starting situation is the valve diaphragm 33 in the position, in which the valve diaphragm 33, shown in figure 13, without it would require an effect of the compression spring 35, to a large extent against the center section 3 rests. Due to the positioning of the valve core is a small gap between the section 40 and a circulating, thus circular projection/lead 54 of the valve core 34 given to 34 concerning the section 40 of the valve diaphragm 33. This projection/lead 54 encloses the channel 43. Therefore liquid flows over the channel 13 of the core 11 and the following, housing-lateral channel 26 into the channel 37 of the valve diaphragm 33 and from there into the channels 38 and 39 of the valve core 34. From the channel 39 of the valve core 34 the liquid flows by the gap formed between the projection/lead 54 and the section 40 of the valve diaphragm 33 into the chamber there present 42, and of the chamber to 42 over the channel 44 between valve diaphragm 33 and valve core 34 to the chamber 43, passes the filter 46 and arrives over the outlet to 45 at the channel 47 with the flow limiter 53. If a higher liquid pressure adjusts itself in the inlet, thus also in the channel 39, without in consequence of the flow limiter 43 a larger flow rate can withdraw from the pump, this leads to it that the valve diaphragm 33, which is wedged in the boundary region between the center section 3 and the upper section 4 deforms within the central range toward the set screw 36 exhibiting the attack function, against Kraft of the compression spring 35. If the valve diaphragm 34 with their section 40 arrives against the projection/lead 55 of the set screw 36, the section 40 it is turned to which the section 40 contacts the set screw 36 there, with which, since the valve diaphragm 33 can upward move not further toward the overhead panel, the section 40 against the projection/lead 54 of the valve core 34 is pressed and thus the flow through the channel 39 locks. With the drain of the liquid by the flow limiter the pressure in the chamber 43 reduces itself 53, so that the diaphragm, quite due to their own elasticity, moves backward again toward their starting position in accordance with figure 13, so that the section 40 arrives except contact with the set screw 36 and is again released the flow gap between the projection/lead 54 and the section 40. As a function of the pressure, which prevails in the balloon 16, this condition can only with reaching the starting position of the valve diaphragm 33, how it is represented in figure 13, or quite already in former times, thus with still out-guided valve diaphragm 33, to enter. The set screw 36 serves the change of the opening closing behavior of the valve 32. The further the screw opens the regulating distance of the valve diaphragm, the secondary pressure is the larger in the valve. In principle it is not necessary to plan the compression spring 35. It is of advantage if larger pressures with the pump 1 are to be controlled and therefore the flexible resetting behavior of the valve diaphragm 33 is not sufficient, in order to transfer them into the starting position in accordance with figure 13.

With the valve 32 the liquid flow rate as a function of the lining up pressure in the balloon 16 is thus limited and kept to a large extent constant over the flow limiter 53 the liquid flow rate. In principle the hydraulic pump could be modified in such a way that only one mechanism is intended to large constant stops of the liquid flow rate spent by the flexible element or a mechanism for limiting the liquid flow rate spent by the flexible element.

Before using the mechanically operated hydraulic pump liquid is supplied by the Luer LOCK valve 21, with which the liquid arrives into the balloon 16 and the level of the balloon can be read off by the transparent hood 29 on the basis the markings 51 attached in transverse direction of the hood, which are a reference for the transverse extension of the balloon as a function of its filling. After filling the pump 1 and attaching the pump at the patients over the hose 50, under flexible pre-loading of the expand balloon 16, liquid is spent over the valve 32 from the pump, until the balloon is completely emptied and rests against the core 11.

By the particularly simple organization of the descriptive hydraulic pump offers these various possibilities of the use and/or application. The user can use everywhere, immediately, without longer starting time the pump. It can of the user portable, how are used also statically, in all normal areas of life outside, as within the medicine. The pump is sterilized applicable and ensures a minimum operating/handling expenditure. The pump is economically producible due to the simple construction of the few construction units. This is Vorraussetzung for the fact that she can be used in particular in ambulatory and financially weak markets. The small weight of the pump makes the employment in the accident, emergency surgeon, Lazarettsowie for disaster range possible. The functional elements of the pump are individual or altogether exchangeable. The pump is suitable for short or long production times, for example with a balloon with a capacity of 25 ml for a flow rate of 2,5 ml per hour, thus a running time of 10 hours. Of course other balloons use can find, which other volumes exhibit, e.g. 10 ml, 50 ml, 100 ml or 150 ml. The running time can be quite substantially longer, for example until 24 hours. Although flow rates of > 1000 are quite conceivable ml per hour, as preferential area of application a flow rate is regarded from 0,5 to 10 ml per hour.

In accordance with the remark example injection moulding-technically manufactured balloon is described, which serves as collector for the medicine solution and printing reservoir. The balloon exhibits a defined outline in the cross section and in the expansion, for filling flat housing areas and for the avoidance of pressure peaks. It stands radially and/or axially under pre-loading over a more einoder multipart core, for the increase of the resetting forces. The balloon is locked on one side over the core stationarily by means of a locking ring positively, hermetically. The balloon is freely mobile in axial and radial direction ductile during filling and emptying, thereby flexibly and can move frictionlessly within the hood.

The pump 1 can be additionally provided with a Bolusreservoir. In the figure 1 such a Bolus planning with the reference number 52 is illustrated. If necessary the pump can be reequipped to that extent.

The figure 14 illustrates the effect principle of the mechanically operated hydraulic pump with indication physical dimension, described before, in a chart. With cord-dotted line the outline of the pump is explanatory.