DE4140015A1 - System for production of pulsating fluid flow - has pump and two-part heat exchanger with tubular winding - Google Patents

Abstract

A closed hydraulic system containing fluid A generates flow in fluid B and also acts as a heat source for the exchanger (16). Systems A and B have the same flow rate and volume displacement per stroke, and the amount of heat exchanged is automatically adjusted to flow rate. USE/ADVANTAGE - Allows regulation of volume per stroke, frequency and temperature; particularly suited to heart support systems.

Description

The invention relates to a pump and heat exchange system or a system for generating a pulsating flow, hereinafter also referred to as a pulsation flow pump net or as a pump to produce a pulsating Fluid flow.

In particular, the invention relates to a pump for manufacture len a pulsating liquid flow, in which the Vo lumens per stroke, the frequency and other parameters arbitrary Lich can be varied. The pump system according to the Erfin According to a preferred embodiment, manure comprises a Heat exchange device for heating one of the two Liquids flowing through the pump pass by right temperature.

The pump system according to the invention is particularly advantageous Adheres to any application where a pulsating liquid speed flow at a predetermined frequency and tempera is required. The pump system according to the invention is especially advantageous for use in Herzun support systems in which it is necessary to produce a pul blood flow with a predetermined volume per Maintain stroke, and in which the blood a warmth  is subject to exchange to it by means of heat exchange device included in the system bring a predetermined temperature.

In brief, the invention relates to a system for Establish or generate a pulsating flow of a certain liquid, preferably with a device device for a predetermined heating of the liquid a given temperature is provided. The system includes a pulsating pump and a two-part split Tube heat exchanger with a meandering path. The current of this liquid in a pulsed manner by means of a closed hydraulic circuit another ren liquid which has the additional function has to serve as a heat source for the liquid that between the meandering pipes of the heat exchanger exchangers circulates. The two fluid flows have same flow rate or flow throughput and an equal stroke volume, and it's an on direction for setting the flow rate or the flow throughput and for heating the volume of liquid speed per stroke and the frequency of each cycle. More specifically, the system comprises a number of each other the connected chambers, the arrangement being such that the first chamber by means of a movable partition is connected to another container, which is a Betä means for a rhythmic movement of the intermediate contains wall, the first chamber with a Kammerge mäanderarti split tubular heat exchanger housing according to the route via an inlet channel leading to one half of the Heat exchanger leads, is connected, and being the first Chamber also with the other half of the heat build-up Schers is connected via a line that is in one directional valve ends. The chamber mentioned, which prevents the heat  exchanger is from another chamber through one Partition separated, the first part of the heat exchangers via a one-way valve with this additional chamber is connected, and being a line from this further Chamber leads to the second half of the heat exchanger.

The top chamber described above is over a flexible membrane connected to a pump head, and the Actuation of the membrane causes a corresponding liquid flow through the pump head. This pump head is via a one-way valve with the heat exchanger chamber connected, this liquid (preferably blood) over or circulated through the narrow gaps, which Liquid through an outlet channel, generally diago nal is arranged opposite the inlet channel, exits, from where they have a cardiac support device or a Similar system, which as such or sol ches is not part of the invention, back to the entry channel of the pump head circulates.

Accordingly, two separate synchronized pulsating Flows of two liquids with or with identical Volume generated per stroke. In the lowest chamber is gene rell a thermostatted heater is provided, which the Heat exchange fluid to a desired temperature heats.

One of the features of the novel pump / heat exchange System is the flow of heat exchange fluid in the closed circuit and the actuation of the pulsating Flow by means of movable partitions, such as wise pistons or two flexible membranes through a Volume of fluid coupled between them and synchronized are based. Stream in a cardiac support device  generally both liquids, namely heat exchange medium and blood, through closed cycles.

When the lower membrane moves up and down the volume changes in the chamber that wel the other side of the membrane is limited accordingly the driven volume of the hydraulic fluid. These Chamber is provided with one-way valves that ver with pipes are bound, and accordingly the second liquid, ge nerell blood exposed to a pulsating flow. A Heat exchange takes place in a unidirectional or on flow away through this chamber instead.

If the invention ver in a cardiac assist system some of the preferred parameters are about like follows:

• a) The water (heat exchange liquid) is in his Container warmed to 40 ° C and this is the hottest Temperature, which by means of the tubular heat exchanger through which this water circulates; and
• b) the other liquid, blood, enters at about 32 ° C and leaves the heat exchange chamber at a temperature temperature, which does not exceed about 38 ° C;
• c) the pumped by means of the piston or the membrane Water also circulates through the "jacket and pipe" - Heat exchanger; and
• d) the water flows through the pipes (the heat rope schers), which are preferably in a vertical position tion in the chamber mentioned while the blood is around these around in a diagonal direction from the one  exit channel or passage to the exit channel or - Passage flows over and through narrow interstices spaces between the heat exchange tubes.

According to a preferred embodiment, the particular suitable for use in cardiac assist systems a pump frequency of approximately 90 per minute is indicated turns, each stroke output in the order of about Is 30 to 50 ml. The speed of the suction and off tidal flow need not be identical, and can, if desired, be varied arbitrarily.

The spatial position of the entire system is of none Importance.

The foregoing, as well as other advantages and features of Invention are based on a preferred embodiment with reference to the attached single figure of the Drawing explained in more detail, which is schematic and not to scale a partial longitudinal section through Pump system according to a preferred embodiment of the lying invention shows.

The pulsating flow heat exchange system according to a preferred embodiment of the invention, as shown in the single figure of the drawing, comprises in combination an elongated chamber 11 , an upper loading container 12 , which is the pump or pump head, and a lower container 13 , wherein the upper container 12 is separated from an adjacent upper chamber 23 by means of a membrane 14 , while it is separated from the chamber 11 by an intermediate wall 19 . The chamber 11 for its part is separated from the lower container 13 by an intermediate wall 15 which limits the lower container 13 (in the present case partially). Provided within the chamber 11 is a multi-tube or multi-tube heat exchanger 16 with tubes which delimit or form a meandering circuit which, on the one hand, consists of a left part 17 , which via a valve 18 , in the present case a one-way valve, with the container 13 and is connected via a tube 27 to the interior of the upper chamber 23 . Furthermore, the meandering circuit consists of a right part 20 and the tubular heat exchanger 16 from a right side 20 , which or via an inlet channel or passage 21 with the lower container 13 and a one way valve 22 with the upper compartment 23 or the upper chamber 23 is connected. Within the lower container 13 , a heating or heating element 24 is provided with a thermostat 25 , and this heats liquid A, which circulates from this container 13 through the chamber 11 , the compartment or the chamber 23 , and back.

Periodic movement of the intermediate wall, swinging wall, resilient plate or the like (membrane) 26 , which separates a liquid column 28 (which causes this periodic movement) from the lower container 13 , produces a flow of heated liquid A through the tubes of the heat exchanger schers 16 . As a result of this, a simultaneous periodic movement of the upper diaphragm 14 takes place, which leads to a flow of the second liquid B through the pump head, ie the upper container 12 . When the membrane 14 moves upward, the valve 22 opens, and the valve 18 closes, and warm liquid flows through the inlet 21 into the meandering pipes 20 and through the valve 22 into the upper reservoir 23 or the upper chamber 23 .

When the diaphragm 26 moves downward, the valve 22 closes and the valve 18 opens, and as a result, the warm liquid flows through the inlet 27 into the arcuate pipes 17, and through the valve 18 in the lower one Container 13 , and as a result, the dividing membrane 14 moves downward.

The periodic movement of the dividing diaphragm 14 within the pump head 12 and the one-way valves 29 and 30 produce a pulsating one-way flow or a unidirectional flow of the liquid B in the following manner:
When the dividing membrane 14 moves upwards, the valve 29 closes and the valve 30 opens, thereby causing liquid B from the pump head 12 through the valve 30 and the line or the pipe 31 and through the inlet 32 into the heat exchanger pressed. In the heat exchanger section 11 , the liquid B flows over the outer surfaces of the warm pipes 17 and 20 , absorbs heat, flows out through the outlet 33 , and is forced through the pipe or line 34 into the system 35 . When the dividing diaphragm 14 (resilient plate, swinging wall, partition, diaphragm or the like) moves downward, the valve 29 opens and the valve 30 closes, so that liquid B through the suction pipe 36 and the one-way valve 29 from the System 35 is sucked.

As described above, there are two separate flow cycles which are generated by a single source. Liquid A fulfills two functions:

• a) It is a hydraulic fluid which produces the pump 12 or the pump action or the pressure level of the pump in the upper container 12 , and
• b) it is a warm liquid, which serves that the liquid B reaches the desired temperature.

The preheated hydraulic fluid A, which produces the pump head 12 or the pressure head of the pump in the upper loading container 12 , also serves as the heat source for the heat exchanger, which heats the flowing fluid B through the pump head 12 or the pressure head Pump in the upper container 12 is driven.

The two currents are in such a way synchronizes that amount of heat that is exchanged the larger the stroke volume and the larger the Flow rate or flow rate.

Due to the property of the liquid A that it is incompressible, the periodically controlled movement of the diaphragm 26 is transferred precisely to the dividing diaphragm 14 . Accordingly, the supply of liquid B to the system 25 is precisely controlled by controlling the source of movement (liquid column 28 ).

With the invention, a device for producing egg a pulsating flow of a certain liquid Provided, with means of arbitrary Varying the stroke volume, stroke frequency and others Parameter. A preferred embodiment makes this possible Heating the liquid to a certain, predetermined tight or temperature controlled within narrow limits. Another Liquid is used for heat exchange as well as to give the pulsating flow, to impress and / or  to create. The device is especially advantageous Way suitable for cardiac support systems where he is it is necessary to raise the blood to a certain temperature warm it up with a predetermined pulsating flow feed.

Claims (11)

A system for generating a pulsating flow of a liquid B at a predetermined rate or throughput, a predetermined stroke volume and a predetermined temperature, which comprises a pulsating pump and a two-part split tubular heat exchanger ( 16 ) with a winding or meandering path, the Flow of liquid B is generated by a closed hydraulic circuit of a liquid A, which also serves as the heat source for the heat exchanger ( 16 ), the two flows of liquids A and B having the same rates or flow rates and stroke volumes and the amount exchanged heat is automatically related to the flow rate or flow rate. 2. System according to claim 1 for generating a pulsation of the flow of a liquid B with a predetermined stroke volume, while the liquid is heated by heat exchange by means of a liquid A, which circulates through a two-part split tubular heat exchanger ( 16 ) with a winding or meandering path, the A system, particularly in combination, comprises: means ( 28 ) for moving up and down a partition ( 26 ); a lower chamber ( 13 ) which is in contact with this intermediate wall ( 26 ) and which is separated from another chamber ( 11 ) above it by another intermediate wall ( 15 ) which comprises one or two tubular heat exchangers consisting of two units ( 16 ) with a winding or meandering path; an upper chamber ( 23 ) above the heat exchange section or chamber ( 11 ) which is separated by an intermediate wall ( 19 ) and is in contact via a movable intermediate wall ( 14 ) with a pump head ( 12 ) for pumping liquid A; the tube ( 20 ) forming part or half of the heat exchanger ( 16 ) being connected to the lower chamber ( 13 ) by means of an inlet channel or passage (21) for the liquid A, and wherein the upper end of the or this tube ( 20 ) is connected to the upper chamber ( 23 ) via a one-way valve ( 22 ); the other part or the second half ( 17 ) of the split heat exchanger tube ( 16 ) being connected to the upper part or chamber ( 23 ) through an inlet channel or passage (27), while the lower end of the tube or tube ( 17 ) ends in a one-way valve ( 18 ) leading into the lower chamber ( 13 ); the movement of the lower intermediate wall ( 26 ) leads to a corresponding movement of the hydraulically connected upper intermediate wall ( 14 ), so that in this way a certain volume of the liquid A which is passed through a heating device ( 24 , 25 ) in the lower chamber ( 13 ) has been heated, is pumped into the upper section or chamber ( 23 ), with a downward stroke being effected that the liquid A through the other part or the other half of the heat exchanger ( 16 ) into the lower section or chamber ( 13 ) flows; wherein further the movement of the upper movable partition ( 14 ) is a volume of liquid B, which is identical to the moving volume of liquid A, through the upper pump ( 12 ) and through the heat exchange section ( 11 ), where the same is heated by contact with the heat exchanger ( 16 ), and pumps from there to the user ( 35 ). 3. System according to claim 1 or 2, characterized ge indicates that the liquid A a hydraulic fluid, water or saline.   4. System according to claim 1, 2 or 3, characterized ge indicates that the liquid B blood or is a blood substitute or substitute. 5. System according to any one of claims 1 to 4, since characterized in that the liquid B from an initial temperature of about 32 ° C to about 38 ° C brought. 6. System according to any one of claims 1 to 5, characterized in that the user subsystem ( 35 ) is a cardiac assist device. 7. System according to any one of claims 1 to 6, characterized in that a Einrich device for individually adjusting the upward and downward stroke of the liquid column ( 28 ) is provided. 8. System according to any one of claims 1 to 7, since characterized in that the materia lines that are in contact with the liquid B with Blood are compatible. 9. System according to any one of claims 1 to 8, since characterized in that it is in transpor animal form is provided. 10. A pulsating heat exchange pump system for pumping a liquid in a predetermined pulsating manner and for bringing this liquid to a desired temperature, comprising a closed circuit of this first liquid, which contacts the exterior of a tubular heat exchanger ( 16 ) and through one Cardiac assist device ( 35 ) circulates; another liquid A, which circulates in a closed circuit through two parts ( 17 , 20 ) of this heat exchanger ( 16 ) after or with suitable heating; a reciprocating piston, which operates the first liquid speed A via a flexible membrane ( 26 ) and the heat exchanger ( 16 ) and actuates in a synchronous manner a second membrane ( 14 ) which generates a pulsating flow of a second liquid B actuated via a heart support system ( 35 ) after warming up by contact with the warming system. 11. A pulsating heat exchange pump system for pumping a liquid in a predetermined pulsating manner and for bringing this liquid to a desired temperature, comprising a closed circuit of this first liquid B, which contacts and passes through the exterior of a tubular heat exchanger ( 16 ) a cardiac assist device ( 35 ) circulates; another, second liquid A, which circulates in a closed circuit through two parts ( 17 , 20 ) of this heat exchanger after and / or with suitable heating; a reciprocating piston, which actuates the second liquid A via a flexible membrane ( 26 ) and the heat exchanger ( 16 ), and in a synchronous manner actuates a second membrane ( 14 ) which generates a pulsating flow of the first liquid B. actuated via a cardiac support system ( 35 ) after heating by contact with the heating system ( 16 ).