FLUID REPLACEMENT DEVICE

Abstract

A fluid replacement method including: determining the amount of urine expelled by a patient; infusing via a pump fluid from a first fluid source into a patient; determining an amount of fluid infused into the patient from the first fluid source; adjusting the operating of the pump based on the determined amount of urine expelled and the amount of fluid infused into the patient; setting a desired fluid balance for the patient; setting an amount of at least one additional fluid delivered to the patient, wherein the at least one additional fluid is not pumped into the patient; calculating an actual fluid balance based on the determined urine output, the determined amount of fluid infused into the patient from the first fluid source, and the set amount of said at least one additional fluid delivered to the patient; and automatically controlling the pump based on the actual fluid balance and the set desired fluid balance so the actual fluid balance conforms to the desired fluid balance.

Claims

1-20. (canceled)

21. A method for managing fluid levels of a patient, the method comprising: obtaining a urine output rate of a patient; causing a fluid to be infused to the patient via a pump at a first rate; based on the urine output rate and the first rate, obtaining an actual fluid balance of the patient; receiving an input corresponding to a desired fluid balance of the patient; and based on a difference of the actual fluid balance and the desired fluid balance, causing the fluid to be infused to the patient via the pump at a second rate.

22. The method of claim 21, wherein the second rate is less than to the urine output rate.

23. The method of claim 21, wherein the second rate is less than or equal to the first rate.

24. The method of claim 21, wherein the desired fluid balance is a negative value.

25. The method of claim 21, wherein causing the fluid to be infused to the patient at the second rate comprises causing the fluid to be infused to the patient such that the urine output rate is greater than the first rate by a predetermined threshold.

26. The method of claim 21, wherein causing the fluid to be infused to the patient at the second rate comprises causing the fluid to be infused to the patient such that the second rate is at least 100 mL/hour less than the urine output rate.

27. The method of claim 21, wherein the urine output rate is at least 200 mL/hour and the second rate is at least 100 mL/hour.

28. The method of claim 21, wherein obtaining the actual fluid balance comprises comparing a net fluid output rate to a net fluid input rate, the net fluid output rate including the urine output rate and the net fluid input rate including the first rate.

29. The method of claim 21, wherein the urine output rate and the first rate are approximately equal, and wherein causing the fluid to be infused to the patient at the second rate comprises causing the fluid to be infused at least a predetermined amount of time after causing the fluid to be infused to the patient at the first rate.

30. The method of claim 21, wherein the fluid is a first fluid, the method further comprising: causing a second fluid to be infused into the patient at a third rate, wherein obtaining the actual fluid balance is based on the urine output rate, first rate, and third rate.

31. A fluid therapy system, comprising: a urine measurement device configured to measure urine output from a patient; a pump configured to provide a fluid to the patient; one or more processors; and tangible, non-transitory computer-readable media having instructions that, when executed by the one or more processors, cause the fluid therapy system to perform operations comprising obtaining a urine output rate of a patient via the urine measurement device; based at least in part on the urine output rate, obtaining an actual fluid balance of the patient; receiving an input corresponding to a desired fluid balance of the patient; and based on a difference of the actual fluid balance and the desired fluid balance, causing the fluid to be infused to the patient via the pump at an infusion rate less than or equal to the urine output rate.

32. The fluid therapy system of claim 11, wherein the infusion rate is a second infusion rate, the operations further comprising, prior to causing the fluid to be infused to the patient at the second infusion rate, causing the fluid to be infused to the patient via the pump at a first infusion rate.

33. The fluid therapy system of claim 32, wherein the second infusion rate is less than or equal to at least one of the urine output rate or first infusion rate.

34. The fluid therapy system of claim 32, wherein the actual fluid balance is based on the urine output rate and the first infusion rate.

35. The fluid therapy system of claim 32, wherein causing the fluid to be infused to the patient at the second infusion rate comprises causing the fluid to be infused to the patient such that the urine output rate is greater than the first infusion rate by a predetermined threshold.

36. The fluid therapy system of claim 32, wherein obtaining the actual fluid balance comprises comparing a net fluid output rate to a net fluid input rate, the net fluid output rate including the urine output rate and the net fluid input rate including the first infusion rate.

37. The fluid therapy system of claim 32, wherein the urine output rate and the first infusion rate are approximately equal, and wherein causing the fluid to be infused to the patient at the second infusion rate comprises causing the fluid to be infused at least a predetermined amount of time after causing the fluid to be infused to the patient at the first infusion rate.

38. The fluid therapy system of claim 31, wherein the infusion rate is at least 100 mL/hour less than the urine output rate.

39. The fluid therapy system of claim 31, wherein the urine output rate is at least 200 mL/hour and the infusion rate is at least 100 mL/hour.

40. The fluid therapy system of claim 31, wherein the fluid is a first fluid, the operations further comprising causing a second fluid to be infused into the patient at a third infusion rate, wherein obtaining the actual fluid balance is based on the urine output rate, first infusion rate, and third infusion rate

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

[0024] Other objects, features and advantages will occur to those skilled in the art from the following description of a preferred embodiment and the accompanying drawings, in which:

[0025] FIG. 1 is a block diagram depicting the primary components associated with an example of a fluid management system in accordance with the subject invention;

[0026] FIG. 2 is a schematic front view of a fluid management device incorporating the components depicted in FIG. 1 in an integrated manner;

[0027] FIG. 3 is a schematic view of the display of the device shown in FIG. 2;

[0028] FIG. 4 is a view of the display shown in FIG. 3 configured to allow the user to set a desired fluid balance;

[0029] FIG. 5 is a view of the display shown in FIG. 3 configured to allow the user to set the amount of another fluid delivered to the patient;

[0030] FIG. 6 is a schematic view of the display shown in FIG. 3 allowing the user to set the amount of fluid expelled by the patient other than urine;

[0031] FIG. 7 is a flow chart depicting the primary steps associated with the programming of the processing subsystem shown in FIG. 1 and also depicting the primary steps associated with a fluid balancing method in accordance with the subject invention;

[0032] FIG. 8 is a graph showing a therapy scenario where the desired fluid balance setting is positive;

[0033] FIG. 9 is a graph showing a therapy scenario where the desired fluid balance setting is negative;

[0034] FIG. 10 is a graph showing a therapy scenario where fluid intake from another source has been set by the user;

[0035] FIG. 11 is a schematic view of the display shown in FIG. 3 configured to allow the user to set a bolus setting; and

[0036] FIG. 12 is a graph showing the results of a patient therapy where a bolus setting has been entered by the user.

DETAILED DESCRIPTION OF THE INVENTION

[0037] Aside from the preferred embodiment or embodiments disclosed below, this invention is capable of other embodiments and of being practiced or being carried out in various ways. Thus, it is to be understood that the invention is not limited in its application to the details of construction and the arrangements of components set forth in the following description or illustrated in the drawings. If only one embodiment is described herein, the claims hereof are not to be limited to that embodiment. Moreover, the claims hereof are not to be read restrictively unless there is clear and convincing evidence manifesting a certain exclusion, restriction, or disclaimer.

[0038] Fluid replacement system 10, FIG. 1, in one example, includes weighing subsystem 12 responsive to both the weight of urine collection chamber 14 and source of fluid 16.

[0039] Pump 18 is configured to pump fluid from source 16 into a patient as shown. Pump 18 is controlled by processing subsystem 20, e.g., a computer, a field programmable gate array, application specific integrated circuit, microprocessor, controller, or the like.

[0040] Processing subsystem 20 is configured to be responsive to weighing subsystem 12 and is configured (e.g., programmed) to determine, based on the weight of fluid source 16, the amount of fluid infused into the patient over some interval (e.g., an hour). Processing subsystem 20 may also monitor the operation history of pump 18 to determine the amount of fluid infused into the patient from source 16. Other means for determining the amount of fluid infused into the patient are within the scope of the subject invention. Processing subsystem 20 further determines, based on the weight of urine collection chamber 14, the patient's urine output over some interval. Other means for determining urine output are possible. The programming associated with processing subsystem 20 then typically controls pump 18 to adjust the operation of pump 18 based on the patient's urine output and the amount of fluid infused into the patient (e.g., manually or from other infusion pumps, IV drops, and the like).

[0041] There are also means for setting a desired fluid balance for a given patient and for setting an amount of at least one additional fluid delivered to the patient. Such means may include user interface 22 (e.g., a monitor and keyboard or touch screen). As shown, the set desired balance may be stored in memory 24 associated with processing subsystem 20 and a set amount of the at least one additional fluid delivered to the patient (“other intake”) may also be stored in memory 24. Memory 24 can also be used to store default values for various parameters.

[0042] Processing subsystem 20 includes programming which takes these parameters as inputs and calculates an actual patient fluid balance based on the determined urine output, the determined amount of fluid infused into the patient from the first fluid source, and the set amount of the at least one additional fluid delivered to the patient by other means. Processing subsystem 20 controls pump 18 based on the actual fluid balance and the set desired fluid balance until the actual fluid balance is the same as or approximately the same as the desired fluid balance.

[0043] FIG. 2 depicts one preferred fluid management device including integrated console 30 including weighing subsystem 12, FIG. 1, pump 18, processing subsystem 20, memory 24, and user interface 22 in the form of menu driven touch screen display 32. Chain 34 is connected on one end to the weighing subsystem inside console 30 (e.g., one or more strain gauges) and includes a hook for hanging fluid source 16 (e.g., a saline bag). Chain 36 is also connected on one end to the weighing subsystem inside console 30 and terminates in a hook for hanging urine bag 14. Tubing 38 extends from fluid source 16 through pump 18 and to a needle inserted into the vein of a patient. Tubing 40 extends from a catheter connected to the patient's urinary tract to urine collection bag 14. See Published Patent Application No. 2006/0052764 incorporated herein by this reference.

[0044] The result is a stand alone integrated device which can be coupled to N pole 42 and moved with the patient when he leaves the cath lab as opposed to multiple units wired together or “networked” units.

[0045] FIG. 3 shows how the processing subsystem is configured to display, on display 32, FIG. 2, the determined infused amount at 50, FIG. 3, the determined urine output at 52, the set “other” patient fluid intake at 54, the calculated actual fluid balance at 56, and the desired fluid balance at 58. All amounts are typically in milliliters. The present urine output rate is calculated and displayed as shown in 60. Touch screen menu area 62 allows the user to input and set a desired fluid balance, the “other intake,” and, in one embodiment, other fluids expelled by the patient, if known. Once set, these parameters are displayed as shown. In FIG. 4, the desired fluid balance can be set using buttons 70a and 70b. In FIG. 5, the other fluid intake can be set using buttons 72a and 72b. In FIG. 6, the other fluid output can be set using buttons 74a and 74b. All three menus are activated by selecting the “settings” area 62, FIG. 3.

[0046] Processing subsystem 20, FIG. 1 is programmed as shown in FIG. 7. A patient may have a contrast agent injected to his veins, and the patient will have been imaged and subject to some form of a therapy such as the introduction of a stent. Or, the patient may be recovering from surgery and administered saline, drugs, nutritional supplements, and the like. Once the patient's urinary tract is connected to urine collection bag 14, FIG. 2 and the saline bag is connected to the patient, therapy begins at some point during the patient's stay in the cath lab or other location. At step 100, the patient's urine output is determined. The set “other intake” is read (see display area 62, FIG. 3) from memory 24, FIG. 1, step 102, FIG. 7. The fluid infused amount is determined, step 104, based on the weight of source 16, FIG. 2. The desired fluid balance is read from memory 24, FIG. 1 (see display area 62, FIG. 3), step 106, FIG. 7. If there has been a setting for fluid expelled by the patient other than collected in urine collection chamber 14, FIG. 2, that quantity is also read, step 108, FIG. 7.

[0047] Then, processing subsystem 20, FIG. 1, determines the actual fluid balance, step 110, FIG. 7 and displays it (see display area 56, FIG. 3). The actual fluid balance is the amount infused via pump 18, FIG. 1 plus the set “other intake” less the urine output collected in chamber 14, FIG. 1 and any set “other output.”

[0048] In step 112, FIG. 7, the calculated actual fluid balance is compared to the set desired balance (see display area 58, FIG. 3). If the balance is perfect or within a predetermined range, no action is taken as shown at step 112 in FIG. 7. If the calculated fluid balance is less than or more than the desired set fluid balance by a predetermined amount, however, processing subsystem 20, FIG. 1 controls pump 18, step 114, FIG. 7 to inject less or more fluid from fluid source 16, FIG. 1 until the actual fluid balance equals or approximates the desired fluid balance.

[0049] FIG. 8 shows how at the beginning of therapy, a desired fluid balance of +100 ml/hr is set, the actual urine output is determined to be 100 ml in the first hour as shown at 120. In response, processing subsystem 20, FIG. 1 controls pump 18 to infuse the patient with 200 ml of fluid from source 16 as shown at 122 in FIG. 8. This particular scenario assumes the “other intake” is set at 0. FIG. 8 also shows the determined urine output is compared to the infused amount during the second through fourth hours of therapy.

[0050] FIG. 9 shows an example of where the desired fluid balance is negative. FIG. 10 shows a scenario where the “other intake” has been set by the nurse (see 54, FIG. 3). In the first hour, this patient has expelled only about 25 ml but has taken in about 100 ml of fluid from the “other intake” source. The desired balance is set to zero. In this case, processing subsystem 20, FIG. 1 detects that the desired urine output is less than a set fluid balance and is programmed, in response, to control pump 18, FIG. 1 to infuse a minimum preset amount of fluid from the source of fluid as shown at 126 in FIG. 10. This minimum preset amount of fluid may be 10 ml per hour, for example, a sufficient amount to keep the patient's vein open, but the default amount may be changed by the user via display 32, FIG. 2.

[0051] In the second hour, the patient's urine output is 200 ml but the amount infused is only about 25 ml and again, the set fluid received by the patient from another source is about 100 ml. Processing subsystem 20, FIG. 1, detects that the urine output is greater than the total of the determined amount of fluid infused into the patient and the set amount of the additional fluid delivered to the patient and, in response, the processing subsystem is programmed to control pump 18, FIG. 1 to infuse fluid from the source of fluid until the actual fluid balance equals or approximates the set desired fluid balance as shown in hours three and four of the therapy depicted in FIG. 10.

[0052] FIG. 11 shows how, via touch screen area 62 of touch screen display 32, the user can select infusion settings as shown at 130 which brings up bolus setting 132 which can be adjusted up or down via arrows 134a and 134b. A bolus may be prescribed by a physician and the invention uniquely allows the nurse to insert a prescribed bolus setting which processing subsystem 20, FIG. 1 automatically delivers by controlling pump 18. In FIG. 12, the bolus has been set by the nurse to 250 ml and in the first 30 minutes of therapy, as shown at 150, the full bolus amount has been delivered to the patient by processing subsystem 20, FIG. 1 controlling pump 18 to deliver a bolus of fluid from fluid source 16. After determining that the patient's urine output was about 25 ml as shown at 152 in FIG. 12, processing subsystem 20, FIG. 1 controls pump 18 to deliver from fluid source 16, 275 mL of fluid as shown at 154. Thereafter, balancing proceeds as shown in FIG. 12. The result is a highly versatile, integrated, easy to use automated system for use in the cath lab or other hospital site to prevent nephropathy, dehydration, over-hydration, and the like.

[0053] Although specific features of the invention are shown in some drawings and not in others, this is for convenience only as each feature may be combined with any or all of the other features in accordance with the invention. The words “including”, “comprising”, “having”, and “with” as used herein are to be interpreted broadly and comprehensively and are not limited to any physical interconnection. Moreover, any embodiments disclosed in the subject application are not to be taken as the only possible embodiments.

[0054] In addition, any amendment presented during the prosecution of the patent application for this patent is not a disclaimer of any claim element presented in the application as filed: those skilled in the art cannot reasonably be expected to draft a claim that would literally encompass all possible equivalents, many equivalents will be unforeseeable at the time of the amendment and are beyond a fair interpretation of what is to be surrendered (if anything), the rationale underlying the amendment may bear no more than a tangential relation to many equivalents, and/or there are many other reasons the applicant can not be expected to describe certain insubstantial substitutes for any claim element amended.

[0055] Other embodiments will occur to those skilled in the art and are within the following claims.