DEVICE FOR TREATING AN INDIVUDUAL SUFFERING FROM CARDIAC INSUFFICIENCY, CARDIAC ARREST, CIRCULATORY ARREST OR STROKE

Abstract

The invention relates to a device for treating an individual suffering from cardiac or circulatory arrest or from a stroke, comprising a blood withdrawal device (BE) that is applied to the individual (P), an analysis unit (BA) which is directly or indirectly connected to the blood withdrawal device for detecting a blood analysis result (BAE) providing at least one characteristic of the blood, directly or indirectly connected to a blood return device (BR) that is applied to the individual (P) and is designed to deliver a substance to the individual via the return device (BR).

Claims

1. A system providing treatment of cardiac arrest by withdrawing blood from a patient's or an animal's circulatory system during the cardiac arrest and introducing at least modified blood containing the withdrawn blood to which at least one substance has been added to provide whole body reperfusion of the circulatory system with the modified blood during the treatment of cardiac arrest comprising: blood analysis means, for connection during the treatment to the blood withdrawn from the circulatory system, for determining during the treatment of the cardiac arrest, a plurality of parameters of the blood including at least p02, pC02, and pH representing a current condition of the patient or animal in cardiac arrest and an output representing the determination during the treatment, storage means for storing during treatment of at least two substances from which the at least one substance is selected for treating the cardiac arrest, means for selecting during the treatment, based on the analysis, a type and quantity of the at least one substance from the storage means which is added to the withdrawn blood to form the modified blood, which upon introduction into the circulatory system during the treatment of cardiac arrest lessens or prevents ischemic tissue damage; and means for introducing during the treatment at least the modified blood into the circulatory system which provides the whole body reperfusion of the circulatory system to treat the cardiac arrest and which lessens or prevents the ischemic tissue damage during the treatment.

2. A system in accordance with claim 1, wherein the means for selecting, based on the determination of at least the p02, the pC02 and the pH, selects during the treatment a type and quantity of the at least one substance from the stored substances which is added to the blood to form the modified blood which upon introduction into the circulatory system during the cardiac arrest lessens or prevents ischemic tissue damage; and the means for introducing introduces at least the modified blood into the circulatory system during the treatment which provides the whole body reperfusion of the circulatory system to treat the cardiac arrest, and which lessens or prevents ischemic tissue damage during the treatment of cardiac arrest.

3. A system in accordance with claim 1, comprising: a pump for pumping a regulated flow of the modified blood into the circulatory system.

4. A system in accordance with claim 1, comprising: means for monitoring at least one physiological parameter of the patient or animal during the cardiac arrest and providing a representation of the at least one physiological parameter to the means for selecting which selectis, based on the representation, a type and quantity of the at least one substance to form the modified blood.

5. A system in accordance with claim 2, comprising: means for monitoring at least one physiological parameter of the patient or animal during the cardiac arrest and providing a representation of the at least one physiological parameter to the means for selecting which selectis, based on the representation, a type and quantity of the at least one substance to form the modified blood.

6. A system in accordance with claim 3, comprising: means for monitoring at least one physiological parameter of the patient or animal during the cardiac arrest and providing a representation of the at least one physiological parameter to the means for selecting which selectis, based on the representation, a type and quantity of the at least one substance to form the modified blood.

7. A system in accordance with claim 1 comprising: withdrawing blood from the patient's or animal's circulatory system during the treatment of the cardiac arrest and introducing at least modified blood containing the blood to which at least one substance has been added during the treatment of the cardiac arrest to provide whole body reperfusion of the circulatory system with the modified blood.

8. A system in accordance with claim 7, comprising a pump for pumping the modified blood into the circulatory system.

9. A system in accordance with claim 8, comprising: means for monitoring at least one physiological parameter of the patient or animal during the cardiac arrest and providing a representation of the at least one physiological parameter; and the means for selecting selects the at least one substance to form the modified blood which includes selecting a type and a quantity of the at least one substance based on the representation.

10. A system in accordance with claim 1, comprising: means for mixing at least one stored substance with the withdrawn blood to form the modified blood.

11. A system in accordance with claim 2, comprising: means for monitoring at least one physiological parameter of the patient or animal during the cardiac arrest and providing a representation of the at least one physiological parameter; and the means for selecting selects the at least one substance to form the modified blood which includes selecting a type and a quantity of the at least one substance based on the representation.

12. A system in accordance with claim 3, comprising: means for monitoring at least one physiological parameter of the patient or animal during the cardiac arrest and providing a representation of the at least one physiological parameter; and the means for selecting selects the at least one substance to form the modified blood which includes selecting a type and a quantity of the at least one substance based on the representation.

13. A system in accordance with claim 4, comprising: means for monitoring at least one physiological parameter of the patient or animal during the cardiac arrest and providing a representation of the at least one physiological parameter; and the means for selecting selects the at least one substance to form the modified blood which includes selecting a type and a quantity of the at least one substance based on the representation.

14. A system in accordance with claim 5, comprising: means for monitoring at least one physiological parameter of the patient or animal during the cardiac arrest and providing a representation of the at least one physiological parameter; and the means for selecting selects the at least one substance to form the modified blood which includes selecting a type and a quantity of the at least one substance based on the representation.

15. A system in accordance with claim 6, comprising: means for monitoring at least one physiological parameter of the patient or animal during the cardiac arrest and providing a representation of the at least one physiological parameter; and the means for selecting selects the at least one substance to form the modified blood which includes selecting a type and a quantity of the at least one substance based on the representation.

16. A system in accordance with claim 7, comprising: means for monitoring at least one physiological parameter of the patient or animal during the cardiac arrest and providing a representation of the at least one physiological parameter; and the means for selecting selects the at least one substance to form the modified blood which includes selecting a type and a quantity of the at least one substance based on the representation.

17. A system in accordance with claim 1, wherein the means for storing stores a plurality of substances in solid, liquid or gaseous form, from which the at least one substance is selected by a type and quantity to be mixed with the blood to form the modified blood.

18. A system in accordance with claim 2, wherein the means for storing stores a plurality of substances in solid, liquid or gaseous form, from which the at least one substance is selected by a type and quantity to be mixed with the blood to form the modified blood.

19. A system in accordance with claim 3, wherein the means for storing stores a plurality of substances in solid, liquid or gaseous form, from which the at least one substance is selected by a type and quantity to be mixed with the blood to form the modified blood.

20. A system in accordance with claim 4, wherein the means for storing stores a plurality of substances in solid, liquid or gaseous form, from which the at least one substance is selected by a type and quantity to be mixed with the blood to form the modified blood.

21. A system in accordance with claim 7, wherein the means for storing stores a plurality of substances in solid, liquid or gaseous form, from which the at least one substance is selected by a type and quantity to be mixed with the blood to form the modified blood.

22. A system in accordance with claim 18, wherein the means for storing stores a plurality of substances in solid, liquid or gaseous form, from which the at least one substance is selected by a type and quantity to be mixed with the blood to form the modified blood.

23. A system in accordance with claim 1, wherein the means for selecting selects the at least one substance from at least one of an alkaline buffer solution, an acidic buffer solution, substances affecting sodium, potassium and/or calcium content, blood-thinning substances, free radical trapping agents, glutamate, aspartame, heart-rhythm-stabilizing substances, substances influencing leukocyte count and osmotically-active substances including salts, glucoses and proteins.

24. A system in accordance with claim 2, wherein the means for selecting selects the at least one substance from at least one of an alkaline buffer solution, an acidic buffer solution, substances affecting sodium, potassium and/or calcium content, blood-thinning substances, free radical trapping agents, glutamate, aspartame, heart-rhythm-stabilizing substances, substances influencing leukocyte count and osmotically-active substances including salts, glucoses and proteins.

25. A system in accordance with claim 3, wherein the means for selecting selects the at least one substance from at least one of an alkaline buffer solution, an acidic buffer solution, substances affecting sodium, potassium and/or calcium content, blood-thinning substances, free radical trapping agents, glutamate, aspartame, heart-rhythm-stabilizing substances, substances influencing leukocyte count and osmotically-active substances including salts, glucoses and proteins.

26. A system in accordance with claim 4, wherein the means for selecting selects the at least one substance from at least one of an alkaline buffer solution, an acidic buffer solution, substances affecting sodium, potassium and/or calcium content, blood-thinning substances, free radical trapping agents, glutamate, aspartame, heart-rhythm-stabilizing substances, substances influencing leukocyte count and osmotically-active substances including salts, glucoses and proteins.

27. A system in accordance with claim 8, wherein the means for selecting selects the at least one substance from at least one of an alkaline buffer solution, an acidic buffer solution, substances affecting sodium, potassium and/or calcium content, blood-thinning substances, free radical trapping agents, glutamate, aspartame, heart-rhythm-stabilizing substances, substances influencing leukocyte count and osmotically-active substances including salts, glucoses and proteins.

28. A system in accordance with claim 9, wherein the means for selecting selects the at least one substance from at least one of an alkaline buffer solution, an acidic buffer solution, substances affecting sodium, potassium and/or calcium content, blood-thinning substances, free radical trapping agents, glutamate, aspartame, heart-rhythm-stabilizing substances, substances influencing leukocyte count and osmotically-active substances including salts, glucoses and proteins.

29. A system in accordance with claim 17, wherein the means for selecting selects the at least one substance from at least one of an alkaline buffer solution, an acidic buffer solution, substances affecting sodium, potassium and/or calcium content, blood-thinning substances, free radical trapping agents, glutamate, aspartame, heart-rhythm-stabilizing substances, substances influencing leukocyte count and osmotically-active substances including salts, glucoses and proteins.

30. A system in accordance with claim 9, wherein the means for monitoring monitor the at least one physiological parameter monitors at least one of mean arterial pressure, central nervous pressure, pulmonary artery pressure, oxygen saturation and blood temperature.

31. A system in accordance with claim 1, wherein: the plurality of parameters of the blood further includes potassium content, calcium content, base excess, lactate value or glucose content.

32. A system in accordance with claim 7, comprising: a heat exchanger in a blood flow path, disposed between a point of withdrawal of the blood from the circulatory system and point of return of at least the modified blood into the circulatory system which, based on the analysis, controls a temperature of at least the modified blood introduced into the circulatory system.

33. A system in accordance with claim 32, comprising means for controlling, based on the analysis, at least one of pressure, flow rate and temperature of at least the modified blood introduced into the circulatory system.

34. A system in accordance with claim 7, comprising means for providing an oxygen enrichment and a depletion means in a blood flow path, disposed between a point of withdrawal of the blood from the circulatory system and a point of return of at least the modified blood into the circulatory system for analyzing an amount of oxygen in the withdrawn blood and controlling with the oxygen and the depletion means, based on an analysis of oxygen in the withdrawn blood, oxygen present in at least the modified blood.

Description

BRIEF DESCRIPTION OF THE INVENTION

[0066] The invention is described below, without restricting the general concept of the invention, by way of examples of embodiments with reference to the drawings, in which:

[0067] FIG. 1 shows a block diagram of an illustration of the individual components of an example of embodiment;

[0068] FIG. 2 shows a schematic view of the analysis unit;

[0069] FIG. 3 shows a schematic view of a reservoir and dosage unit; and

[0070] FIG. 4 a generalized block diagram of an example of embodiment.

DESCRIPTION OF EMBODIMENTS OF THE INVENTION

[0071] In FIG. 1, a block diagram illustrating all the components of an embodiment of a device in accordance with the invention is shown. The use of the device is explained in more detail using the example of a human patient P as an individual who has suffered a cardiac arrest. Applied to the patient P in the area of femoral vein in order take blood are a blood withdrawal device BE shown as a catheter, from which a blood flow path BL extends extracorporeally, which passes through various technical components and from which at various points lines branch off and into which at various points lines open, which are discussed in more detail below. Finally the blood flow path BL enters the patient again, more particularly in the area of the femoral artery to which a blood returns device BR shown as a catheter is also applied.

[0072] For controlled blood withdrawal from the patient P and for setting the reperfusion parameters under which the device to be described returns “modified blood” or reperfusate into the patient's blood circulation, a conveying unit F is provided along the blood flow path BL, which is more particularly in the form of a centrifugal pump and is to be seen as a component of the lightweight and portable CIRD. The conveying unit F can also be variably adjusted in terms of conveying output, conveying characteristics and duration that is pressure, duration and pulsability, via an evaluation and control unit A/S yet to be described in more detail. In addition, the portable CIRD has an oxygenator O, with which the blood taken from the patient is enriched with oxygen. In certain cases, with the aid of the oxygenator, it is also possible to deplete oxygen from the patient's own blood. There is also a gas blender G, which influences the blood CO.sub.2 content, usually in the form of depletion of the CO.sub.2 content in the patient's own blood. For individual temperature control of the blood flow within the blood flow path BL, the oxygenator O is also connected to a heat exchanger unit. The heat exchanging characteristics are influenced in a controlled manner by the evaluation and control unit A/S. Finally, the portable CIRD unit comprises a leukocyte filter through which the leukocyte content of the patient's blood can be influenced.

[0073] A first by-pass line A1 is provided in the blood flow path BL directly leaving the patient, via which some of the patient's blood is branched off into an analysis unit BA in which the patient's blood is analyzed by sensors with respect to various blood parameters.

[0074] In an expanded form of embodiment, the device of FIG. 1 may be supplemented with further functional units, which are able to modify or manipulate the patient's blood in the following manner.

[0075] Units are thus provided for influencing the patient's blood through extracorporeal pressure exertion on the patient in such a way that in terms of time and space the pressure exertion takes place in a predeterminable manner on the patient evenly or selectively. Such units for the mechanical influencing of the patient's blood can alternatively also be applied invasively and for intracorporeal pressure exertion on the patient's blood.

[0076] In addition, units for the thermal influencing of the patient's blood for extracorporeal temperature control can be provided and designed so that in terms of time and space, the temperature control takes place in a predeterminable manner on the patient evenly or selectively. Such units for the thermal influencing of the patient's blood can alternatively also be applied invasively and for intracorporeal temperature control of the patient's blood so that in terms of space and time the temperature control takes place in a predeterminable manner within the patient evenly or selectively.

[0077] Preferably, to return the blood to the body of the patient P, along the blood flow path, before or after the leukocyte filter LF at least one further, separate conveying device (not shown) can be provided, with which conveying characteristics can be set which are individual and above all independent in relation to pulsability, flow pressure and speed.

[0078] In FIG. 2, an analysis unit BA is shown schematically for more detailed explanation. It is assumed that via line A1, part of the patient's blood reaches the blood analyzing analysis unit BA. Within the analysis unit BA, more particularly in the form of a sensor unit, a number of individual sensors SE.sub.1 to SE.sub.n are provided, which analyze the blood with regard to various blood parameters. Advantageously brought together in the analysis/sensor unit are known sensors each one of which is able to record at least one of the following non-exhaustively listed parameters: pH-value, partial oxygen pressure (pO.sub.2), partial carbon dioxide pressure (pCO.sub.2), potassium content (K), sodium content (NA), calcium content (Ca), the base deviation designated as BE, also known as base excess/base deficit with which metabolic disorders of the acid-base balance can be detected, lactate value (La), glucose content (Gu) to name but a few.

[0079] Each individual sensor SE.sub.1 . . . n determines one blood parameter SEE.sub.1 . . . n, characteristic of the patient's blood, which together produce the so-called blood analysis result BAE which reflects the current quality of the patient's own blood. More particularly, the blood analysis result is transmitted via a data transmission cable to the evaluation and control unit A/S in which the blood analysis result BAE undergoes separate analysis and evaluation based on medical evaluation criteria.

[0080] The purpose of the device in accordance with the invention is ultimately to transform, through the addition of certain substances, the patient's blood into a modified state which can be characterized in the fact that the specially “modified blood” or the reperfusate should not cause any tissue damage during initial reperfusion into the patient for the purpose of the patient's resuscitation. In addition, it is intended to reduce/heal ischaemic damage which may have already occurred in certain tissue areas.

[0081] Within the evaluation and control unit A/S the current sensor-recorded individual blood parameters SEE.sub.1 . . . n of the patient's blood are compared with blood parameter-specific references or nominal values, which are to be restored through modification of the patient's blood. In accordance with such an evaluation the type and quantity of the relevant substances to be added to the patient's blood are determined. The evaluation/control unit is in informal communication with a reservoir unit R as well as a dosage unit D combined therewith, which are both shown schematically in FIG. 3. In accordance with FIG. 3 the reservoir unit R comprises four individual reservoir chambers in which four different substances S.sub.1, S.sub.2, S.sub.3 and S.sub.4 are stored. More such reservoir chambers can of course be provided, that is in general reservoir chambers for storing n different substances. The individual reservoirs are each connected to a mixing container MB, whereby along the connection lines dosage units in the form of stop valves V.sub.1, V.sub.2, V.sub.3 and V.sub.4 are provided. Depending on the current blood analysis result BAE and the additive requirement determined by the evaluation/control unit for the substance to be mixed to the patient's blood, the evaluation/control unit generates control signals Si.sub.1, Si.sub.2, Si.sub.3, Si.sub.4 for operating the dosage units V.sub.1 to V.sub.4. Finally, the mixture of the individual substance prepared in the mixing container MB is introduced into the blood flow path BL.

[0082] In a variant, a monitoring unit M (see FIG. 1) is provided, which via sensors applied to the patient P, records physiological patient parameters, for example the mean arterial pressure, the central venous pressure, the pulmonary arterial pressure, oxygen saturation, as well as body temperature, to name but a few. The physiological patent parameters are also transmitted by the monitoring unit M to the evaluation and control unit A/S, where after being taken into consideration the evaluation and control unit generates the control signals Si.sub.1 . . . n for the dosage unit.

[0083] Before the reperfusate is returned to the patient P via the blood flow path BL, with the aid of the analysis unit BA, an analysis of the “modified blood”/reperfusate is carried out to ensure that a correctly composed/modified reperfusate is being returned to the patient. For this, a second by-pass line A2 is provided immediately upstream of the blood return device BR which diverts some of the “modified blood”/reperfusate into the analysis unit BA. In the analysis unit BA, repeat sensor recording of the individual blood parameters SEE.sub.1 . . . n takes place, which undergoes a nominal/actual comparison in the evaluation and control unit A/S. If deviations occur, the generated control signals Si.sub.1, Si.sub.2, Si.sub.3, Si.sub.4 are corrected in order influence the dosage unit V.sub.1 to V.sub.4.

[0084] Furthermore, on the basis of the blood analysis results BAE and the physiological patient parameters determined by the monitoring unit M, the evaluation and control unit generates control signals to control the conveying unit F determining the flow characteristics within the blood flow path BL, as well as the heat exchanger WT determining the temperature level of the reperfusate being infused into the patient, ultimately with the aim of tissue-protecting reperfusion of the “modified blood” back into the patient's blood circulation. In doing so, the parameters of the flow pressure, the flow rate, the pulsability, flow duration and temperature of the repefusate are individually matched to the patient.

[0085] FIG. 4 shows a schematic blood diagram of a further embodiment of the invention. Sensor unit SEH, provides information obtained from the bodily fluid, more particularly blood, of a patient P. The sensor signals generated by the sensor unit SEH are forwarded to an analysis unit A which generates an analysis result representing the current state of the bodily fluid/blood. Based on at least one evaluation criterion, for example, the analysis result is evaluated by an evaluation and control unit A/S. The evaluation and control unit then generates control or regulating signals for the controlled activation of an operative unit KE which influences the bodily fluid and, in particular, can be composed of at least one of the following sub-units: units which add at least one substance to the bodily fluid MS, units which mechanically influence bodily fluid MM and units which thermally influence bodily fluid. Each of these units can be combined with joining units. Depending on the units that can be activated by the evaluation and control unit A/S, the bodily fluid of the patient P undergoes therapeutic manipulation or modification for the purpose of preventing ischaemic tissue damage.

[0086] The device in accordance with the invention is particularly compact and, if possible, in a single housing to assure as simple and fully automatic operation as possible. The processes of taking the blood, blood analysis, addition of at least one substance to the patient's blood to obtain “modified blood,” and the reperfusion of the “modified blood” take place automatically and in situ, without further knowledge about the person to be resuscitated having to be available. The device obtains all information for successful reperfusion from the described sensor data sensors in the form of data from the automatic blood screening and sensor-detectable physiological data.

[0087] With the benefit of the device in accordance with the invention, controlled whole-body reperfusion can be carried out with which the duration of ischaemia, until irreversible damage to individual organs or even the entire body, can be considerably increased compared with the current narrow time limits.

LIST OF REFERENCES

[0088] BE Blood withdrawal device [0089] BR Blood return device [0090] BL Blood flow path [0091] BA Analysis unit [0092] R Reservoir unit [0093] D Dosage unit [0094] A1 Diversion line [0095] A2 By-pass line [0096] CIRD Basis module of the controlled integrated resuscitation device [0097] F Conveying unit [0098] O Oxygenator [0099] G Gas blender [0100] LF Leukocyte filter [0101] A/S Evaluation/control unit [0102] WT Heat exchanger [0103] M Monitoring unit [0104] S.sub.1, S.sub.2 . . . Substance [0105] Si.sub.1 . . . Control signal [0106] V.sub.1, V.sub.2 . . . Dosage unit, valve [0107] MB Mixing container [0108] SE.sub.1, SE.sub.2 . . . Sensors [0109] SEE.sub.1,SEE.sub.2 . . . Sensor result [0110] BAE Blood analysis result [0111] A Analysis unit [0112] SEH Sensor unit [0113] KE Operative unit [0114] MS Unit for adding at least one substance to the bodily fluid [0115] MM Unit for mechanically influencing the bodily fluid [0116] MT Unit for thermally influencing the bodily fluid [0117] A/S Control Unit