Display panel and controls for blood mixture delivery system

• US 5,573,502 A
• Filed: 03/01/1994
• Issued: 11/12/1996
• Est. Priority Date: 05/26/1993
• Status: Expired due to Term

• Current Assignee: QMI Medical, Inc. (Atrion Corporation)
• Original Assignee: Quest Medical Incorporated (Atrion Corporation)
• Inventors: LeCocq, Andrew D., Mattson, Andrew P., Thompson, Thomas C., Jones, Kenneth A., Abbott, Martyn, Davis, Albert M.
• Primary Examiner(s): Weiss, John G.
• Assistant Examiner(s): RUHL, DENNIS WILLIAM
• Application Number:
  US08/204,532
• Time in Patent Office: 987 Days
• Field of Search: 604/4-6, 604/113, 604/31, 604/53, 604/65, 604/151, 604/67, 128/637, 128/672, 128/695, 128/DIG. 3, 128/DIG. 13, 128/DIG. 12, 128/660.04, 128/660.05
• US Class Current: 604/4.01
• CPC Class Codes: A61M 1/3613 Reperfusion, e.g. of the coronary vessels, e.g. retroperfusion
• CPC Class Codes: A61M 1/36222 Details related to the interface between cassette and machine
• CPC Class Codes: A61M 1/36225 with blood pumping means or components thereof
• CPC Class Codes: A61M 1/3623 Means for actively controlling temperature of blood
• CPC Class Codes: A61M 1/3664 for preparing cardioplegia solutions
• CPC Class Codes: A61M 2202/047 cardioplegic
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 2205/3344 Measuring or controlling pressure at the body treatment site
• CPC Class Codes: A61M 2205/3355 Controlling downstream pump pressure
• CPC Class Codes: A61M 2205/3606 cooled
• CPC Class Codes: A61M 2205/366 by liquid heat exchangers
• CPC Class Codes: A61M 5/16827 controlling delivery of multiple fluids, e.g. sequencing, mixing or via separate flow-paths infusion of multiple fluids without using a controller A61M5/1407
• CPC Class Codes: A61M 5/44 having means for cooling or heating the devices or media
• CPC Class Codes: Y10S 128/03 Heart-lung

Abstract

A display panel for use with a blood mixture fluid delivery system, which system has mechanisms for infusing blood mixture fluid to a patient and for controlling characteristics of the fluid delivery system. The display panel includes a visible schematic representation of a blood mixture fluid flow path through the fluid delivery system and visible displays of two or more of the controllable characteristics of the fluid delivery system, which visible displays are positioned along the schematic representation of the blood mixture fluid flow path.

Claims

1. A blood mixture fluid delivery system, said system defining a fluid flow path from at least one source to a patient, said system having a display panel, a mechanism for infusing a blood mixture fluid to said patient along said fluid flow path and a control mechanism for controlling a plurality of controllable characteristics of said blood mixture fluid delivery system via a plurality of control elements located at a plurality of locations within said fluid flow path, said display panel of said fluid delivery system comprising:

(a) a panel, having depicted thereon a visible schematic representation of said fluid flow path originating from at least one source, through said blood mixture fluid delivery system, to said patient; and

(b) two or more visible displays, each visible display representing at least one of said plurality of controllable characteristics of said blood mixture fluid delivery system, each visible display taking a position with respect to said visible schematic representation analogous to a location of at least one associated control element within said fluid flow path.

2. A fluid delivery system as in claim 1 wherein one of said two or more visible displays comprises a flow rate display, positioned on said panel at a representative position along said visible schematic representation, for displaying a volumetric flow rate of said blood mixture fluid occurring at a corresponding path location in said fluid flow path.

3. A fluid delivery system as in claim 2 wherein said flow rate display include:

(a) a digital display for digitally displaying said volumetric flow rate occurring at said path location; and

(b) an analog display for visually depicting said volumetric flow rate occurring at said path location relative to a predetermined scale.

4. A fluid delivery system as in claim 3 wherein said analog display includes a number of linearly aligned, sequentially activatable LED indicators, wherein the number of LED indicators correspond to said predetermined scale.

5. A fluid delivery system as in claim 2 wherein said mechanism for infusing said blood mixture fluid to said patient further includes a pump activatable and controllable by said control mechanism to cause said blood mixture fluid to flow along said fluid flow path, wherein one of said two or more visible displays comprises a dynamic display indicative of pump activity.

6. A fluid delivery system as in claim 1 wherein one of said two or more visible displays comprises a pressure display, positioned on said panel at a representative position along said visible schematic representation, for displaying a pressure of said blood mixture fluid occurring at a corresponding path location in said fluid flow path.

7. A fluid delivery system as in claim 6 wherein said pressure display is for displaying a patient delivery pressure, wherein said path location is substantially adjacent to a point of infusion in said patient.

8. A fluid delivery system as in claim 6 wherein said pressure display is for displaying a system pressure, wherein said path location is distal to a point of infusion in said patient.

9. A fluid delivery system as in claim 6 wherein said pressure display includes:

(a) a digital pressure display for digitally displaying said pressure occurring at said path location; and

(b) an analog pressure display for visually depicting said pressure occurring at said path location relative to a predetermined scale.

10. A fluid delivery system as in claim 9 wherein said analog display includes a number of linearly aligned, sequentially activatable LED indicators, wherein the number of LED indicators correspond to said predetermined scale.

11. A fluid delivery system as in claim 1 wherein said two or more visible displays of said plurality of controllable characteristics, comprise:

(a) an upper limit display selectable between displaying an upper flow rate limit or displaying an upper pressure limit;

(b) a lower limit display for displaying a lower flow rate limit or displaying a lower pressure limit;

(c) an analog rate display for displaying a measured volumetric flow rate within said fluid flow path, only upon selection of said upper and lower flow rate limit; and

(d) an analog pressure display for displaying a measured pressure within said fluid flow path, only upon selection of said upper and lower pressure limits.

12. A fluid delivery system as in claim 11 further comprising:

(a) a microprocessor operatively connected to said panel for automatically converting said upper and lower pressure limits to corresponding upper and lower flow rate limits based upon measured fluid pressure and measured volumetric flow rate; and

(b) a automatic mode switch operatively connected for selecting said upper and lower pressure limit display and for activating said microprocessor to convert said upper and lower pressure limits to upper and lower flow rate limits based upon a measured volumetric flow rate and a measured fluid pressure measured when said automatic mode switch is actuated.

13. A fluid delivery system as in claim 1 wherein one of said two or more visible displays comprises a temperature display, positioned on said panel at a representative position along said visible schematic representation, for displaying a temperature of said blood mixture fluid occurring at a corresponding path location in said fluid flow path.

14. A fluid delivery system as in claim 13 wherein said temperature display is for displaying a system temperature, wherein said path location is in a heat exchanger fluid circulation path in said blood mixture fluid delivery system.

15. A fluid delivery system as in claim 13 wherein said temperature display is for displaying a patient temperature, wherein said path location is substantially adjacent to a point of infusion in said patient.

16. A fluid delivery system as in claim 1 wherein one of said two or more visible displays comprises a delivery indicator, positioned on said panel at a representative position along said visible schematic representation, for displaying whether the delivery of the blood mixture fluid is to a first path location or a second path location, said representative position, relative to said visible schematic representation, being analogous to said first and second path locations in said fluid flow path.

17. A fluid delivery system as in claim 1 wherein one of said two or more visible displays comprises an additive display, positioned on said panel at a representative position along said visible schematic representation, for displaying a quantity of additive in said blood mixture fluid at a corresponding path location in said fluid flow path.

18. A fluid delivery system as in claim 1 wherein said blood mixture is a cardioplegia fluid and said blood mixture fluid delivery system is a cardioplegia fluid delivery system.

19. A fluid delivery system as in claim 18 wherein one of said two or more visible displays comprises a flow rate display, positioned on said panel at a representative position along said visible schematic representative, for displaying a volumetric flow rate of said cardioplegia fluid occurring at a corresponding path location in said fluid flow path.

20. A fluid delivery system as in claim 19 wherein said mechanism for infusing said cardioplegia fluid to said patient further includes a pump activatable and controllable by said associated control mechanism to cause said cardioplegia fluid to flow along said fluid flow path, wherein one of said two or more visible displays comprises a dynamic display indicative of pump activity.

21. A fluid delivery system as in claim 18 wherein one of said two or more visible displays comprises a pressure display, positioned on said panel at a representative position along said visible schematic representation of said fluid flow path, for displaying a pressure of said cardioplegia fluid occurring at a corresponding path location in said fluid flow path.

22. A fluid delivery system as in claim 18 wherein one of said two or more visible displays comprises a blood-to-crystalloid ratio display, positioned on said panel at a representative position along said visible schematic representation, for displaying a ratio of blood-to-crystalloid in said cardioplegia fluid occurring at a corresponding path location in said fluid flow path.

23. A fluid delivery system as in claim 18 wherein one of said two or more visible displays comprise an arresting agent display, positioned on said panel at a representative position along said visible schematic representation, for displaying a quantity of arresting agent in said cardioplegia fluid at a corresponding path location in said fluid flow path.

24. A fluid delivery system as in claim 23 wherein said path location is where said arresting agent is introduced into said fluid flow path, said cardioplegia fluid delivery system providing,

(a) a means for delivering a user-definable high concentration of arresting agent or a user-definable low concentration of arresting agent from a single arresting agent source, and

(b) a means of adjusting such user-defined concentrations below and above such initial concentration settings during operation.

25. A fluid delivery system as in claim 18 wherein said two or more visible displays of said plurality of controllable characteristics, comprise:

(a) an upper limit display and a lower limit display alternatively selectable between displaying upper and lower flow limits or upper and lower pressure limits;

(b) a flow rate analog display for visibly displaying a measured volumetric flow rate only upon selection of said display of upper and lower flow rate limits; and

(c) a pressure analog display for visibly displaying a measured fluid pressure only upon selection of said upper and lower pressure limits.

26. A fluid delivery system as in claim 25 further comprising:

(a) a microprocessor operatively connected to said panel for automatically converting said upper and lower pressure limits to corresponding upper and lower flow rate limits based upon measured fluid pressure and measured volumetric flow rate; and

(b) a automatic mode switch operatively connected for selecting said upper and lower pressure limit display and for activating said microprocessor to convert said upper and lower pressure limits to upper and lower flow rate limits based upon a measured volumetric flow rate and a measured fluid pressure measured when said automatic mode switch is actuated.

27. A fluid delivery system as in claim 1 further comprising:

(a) an upper pressure limit display; and

(b) a lower pressure limit display.

28. A fluid delivery system as in claim 27 further comprising an analog display, positioned on said panel and interposed between said upper pressure limit display and said lower pressure limit display, for visually depicting a measured fluid pressure in said fluid flow path relative to said upper limit and said lower limit for said pressure.

29. A fluid delivery system as in claim 1 further comprising:

(a) communication means operatively connected between said two or more visible displays and said associated control mechanism, wherein at least one of said plurality of control elements is responsive to a set value displayed in at least one of said two or more visible displays to obtain in said blood mixture fluid delivery system an operational value for said at least one of said plurality of controllable characteristic, such operational value being a physical equivalence to said displayed set value; and

(b) adjustment means, operatively connected to said at least one visible display, for adjusting said set value.

30. A fluid delivery system as in claim 29 wherein said adjustment means comprises:

(a) an adjustment mode switch positioned on said panel adjacent to said at least one visible display, said switch manually operable to select an adjustment mode of operation; and

(b) a set knob, positioned on said panel and operatively connected to said associated control mechanism upon manually selecting said adjustment mode of operation, for setting said set value of said at least one of said plurality of controllable characteristics.

31. A fluid delivery system as in claim 30 wherein;

(a) said blood mixture fluid is a cardioplegia fluid;

(b) said at least one visible display comprises a blood;

crystalloid ratio display, wherein said blood;

crystalloid ratio display indicates a set value for said ratio of blood to crystalloid in said cardioplegia fluid; and

(c) said adjustment mode switch is positioned on said panel adjacent to said blood;

crystalloid ratio display, said adjustment mode, when active, allowing the adjustment of said set value via said set knob, wherein upon adjustment at least one of said plurality of control elements are actuated to adjust said ratio of blood to crystalloid in said cardioplegia fluid to obtain a corresponding operational value in said fluid flow path.

32. A fluid delivery system as in claim 30 wherein:

(a) said blood mixture fluid is a cardioplegia fluid;

(b) said at least one visible display comprises an arresting agent display, wherein said arresting agent display indicates a set value for a quantity of arresting agent in said cardioplegia fluid; and

(c) said adjustment mode switch is positioned on said panel adjacent to said arresting agent display, said adjustment mode, when active, allowing the adjustment of said set value via said set knob, wherein upon adjustment at least one of said plurality of control elements are actuated to adjust said quantity of arresting agent in said cardioplegia fluid to obtain a corresponding operational value in said fluid flow path.

33. A fluid delivery system as in claim 30 wherein:

(a) said at least one visible display comprises a fluid temperature display, wherein said fluid temperature display indicates a set value for a temperature in said blood mixture fluid; and

(b) said adjustment mode switch is positioned on said panel adjacent to a said fluid temperature display, said adjustment mode, when active, allowing the adjustment of said set value via said set knob, wherein upon adjustment at least one of said plurality of control elements are actuated to adjust said temperature in said blood mixture fluid to obtain a corresponding operational value in said fluid flow path.

34. A fluid delivery system as in claim 30 wherein:

(a) said at least one visible display with which said adjustment mode switch is associated comprises a digital display having at least two levels of light intensity; and

(b) said digital display is activated from a low level of light intensity to a high level of light intensity upon selection of said adjustment mode.

35. A fluid delivery system as in claim 1 wherein said two or more visible displays, each representing at least one of said plurality of controllable characteristics of said blood mixture fluid delivery system, comprise:

(a) a first display of a controllable characteristic of primary significance and a second display of a controllable characteristic of secondary significance; and

(b) wherein said first display of said controllable characteristic of primary significance is constructed on said display panel with greater visibility than said second display of a controllable characteristic of secondary significance.

36. A fluid delivery system as in claim 35 wherein said construction by which said first display has greater visibility than said second display comprises said first display being larger than said second display, said primary significance of said first display being determined by said plurality of controllable characteristic and which of such plurality is critical to the delivery of said blood mixture fluid.

37. A fluid delivery system as in claim 35 wherein said construction by which said first display has greater visibility than said second display comprises said first display being brighter than said second display, said primary significance of said first display being determined by said plurality of controllable characteristic and which of such plurality is critical to the delivery of said blood mixture fluid.

38. A fluid delivery system as in claim 35 wherein said construction by which said first display has greater visibility than said second display comprises said first display having a first color of primary prominence and said second display having a second color of secondary prominence, said primary significance of said first display being determined by said plurality of controllable characteristic and which of such plurality is critical to the delivery of said blood mixture fluid.

39. A fluid delivery system as in claim 35 wherein said construction by which said first display has greater visibility than said second display comprises said first display which has a first color red of primary prominence and said second display has a second color green of secondary prominence.

40. A fluid delivery system as in claim 35 wherein said construction by which said first display of said characteristic of primary significance has greater visibility than said second display of said characteristic of secondary significance comprises positioning said first display of said primarily significant characteristic along a vertical center line of said display panel and positioning said second display of said characteristic of secondary significance adjacent to said vertical center line of said display panel, said primary significance being attributable to the criticality of said characteristic of primary significance to the delivery of said blood mixture fluid.

41. A fluid delivery system as in claim 1 further comprising:

(a) an information screen positioned adjacent to and viewable simultaneously with said visible schematic representation of said fluid flow path, said information screen visibly presenting a plurality of selectable informational messages regarding said blood mixture fluid delivery system; and

(b) means for selecting one or more of said plurality of informational messages to be visibly presented.

42. A fluid delivery system as in claim 41 wherein said means for selecting said one or more of said plurality of informational messages to be visibly presented on said information screen comprises:

(a) a plurality of independently activatable function keys by which a function of the blood mixture fluid delivery system can be selected, corresponding to an activated function key, thereby determining the informational messages to be displayed; and

(b) automatic circuitry connected to said panel, said information screen and said function keys for causing informational messages to be displayed regarding said plurality of controllable characteristics of said blood mixture fluid system and which of said plurality of function key is selectably activated.

43. A fluid delivery system as in claim 41 wherein said means for selecting said informational messages to be presented further comprises a plurality of variable function keys, a function of one or more of said variable function keys being indicated in one or more of a plurality of display fields within said information screen.

44. A fluid delivery system with an information screen as in claim 41 further comprising:

(a) a plurality of information presentation fields, each at a predetermined position on said information screen;

(b) a plurality of manually actuatable variable function keys positioned adjacent various ones of said plurality of presentation fields;

(c) preprogrammed circuitry by which a current function of each of said variable function keys is determined so that activation of a selected one of said keys adjacent a particular information field generates another visible presentation, so that said presentation is thereby selected.

45. A fluid delivery system as in claim 41 further comprising:

(a) a plurality of message fields at predetermined separate locations on the face of said information screen;

(b) a plurality of variable function keys positioned around a border of said information screen at predetermined locations adjacent to said predetermined locations of said message fields; and

(c) input/output circuitry by which said message fields display preprogrammed queries to which an operator may respond with one or another query responses through actuation of one or another of said variable function keys, which one or other variable function key is positioned adjacent to a corresponding message field in which said query responses are displayed.

46. A fluid delivery system as in claim 41 wherein:

(a) said means for selecting said informational message to be displayed on said information screen further comprises switches positioned on said display panel actuatable to select a designated mode of operation from a predetermined set of modes of operation, including a set-up mode, a system priming mode, a system running mode, a volume delivered and dose mode, a default value setting mode, and a timer mode; and

(b) automatic control means responsive to each of said selective actuation of said mode selection switches for automatically displaying preprogrammed messages corresponding to system characteristics appropriate for display in each of said selected modes of operation.

47. A fluid delivery system as in claim 41 wherein said means for selecting said message to be displayed further comprises a switch actuatable to initiate a priming sequence, said priming sequence requiring said associated control mechanism to ready said fluid delivery system for blood mixture fluid delivery by moving said blood mixture fluid into said delivery system from said at least one source and placing said plurality of control elements in a ready condition.

48. A cardioplegia delivery system having a display panel, which said cardioplegia fluid delivery system has mechanisms for infusing blood, crystalloid, heart arresting agent and for controlling a plurality of controllable characteristics along a fluid flow path defined by said fluid delivery system, said display panel of said cardioplegia fluid delivery system comprising:

(a) a digital display of numeric values that display a settable upper limit and a settable lower limit for a specified controllable characteristic; and

(b) an analog display depicting an actual value of said specified controllable characteristic measured along said fluid flow path, for which said upper and lower limits are represented and provide a basis of relative measurement for said actual value, wherein such combination of digital and analog displays empowers a user to immediately assess potentially critical conditions relating to infusion of cardioplegia fluid.

49. A fluid delivery system as in claim 48 wherein:

(a) said upper limit digital display is positioned on said panel vertically above and spaced apart a predetermined linear distance from said lower limit digital display; and

(b) said analog display is positioned between said lower and upper limit digital displays and comprises a visual depiction of a variable length line extending from said lower limit partially toward said upper limit along said linear distance therebetween, said variable length line being representative of said measured actual value relative to said settable upper and lower limits.

50. A fluid delivery system as in claim 49 wherein said visible depiction of said variable length line comprises a series of LED indicators aligned along said linear distance between said upper and said lower limit digital displays, which LED indicators are sequentially lighted to produce a depiction of a line corresponding to a proportional length signifying the actual value relative to the settable upper and lower limits.

51. A fluid delivery system as in claim 49 wherein said specified controllable characteristic is a volumetric flow rate of said cardioplegia fluid along said fluid flow path, wherein said analog display depicts a measured volumetric flow rate relative to set upper and lower limits, such set upper and lower limits being respectively displayed in said upper limit digital display and said lower limit digital display.

52. A display panel as in claim 49 wherein said specified controllable characteristic is a cardioplegia fluid pressure substantially at a point of delivery to said patient, wherein said analog display depicts a measured pressure at said point of delivery relative to set upper and lower limits, such set upper and lower limits being respectively displayed in said upper limit digital display and said lower limit digital display.

53. A fluid delivery system as in claim 49 wherein said digital display of numeric values that display a settable upper limit and a settable lower limit for a specified controllable characteristic comprise a single display, said single display being selectably switchable between displaying an upper limit and a lower limit for said specified characteristic and displaying an upper limit and a lower limit for another characteristic, and said analog display comprises a first analog display for depicting a first measured actual value for said specified characteristic and a second analog display for depicting a second measured actual value for said other characteristic, which analog first and second displays are side by side, but which are activatable separately for displaying said specified or said other characteristic corresponding to the selected specified or other characteristic for which said upper and lower limits are displayed.

54. A fluid delivery system as in claim 53 wherein said first and second analog displays further comprise illuminated labels to identify the characteristic for which said upper and lower limits are associated and which of first or second measured actual values are being displayed in said respective analog display.

55. A fluid delivery system as in claim 53 wherein:

(a) said specified characteristic, for which upper and lower limits are selectably displayed and for which said first analog display is provided, corresponds to a cardioplegia fluid volumetric flow rate; and

(b) said other characteristic, for which upper and lower limits are selectably displayed and for which said second analog display is provided, corresponds to a cardioplegia fluid delivery pressure measured at said patient.

56. A cardioplegia fluid delivery system having a display panel and controls for use by an operator to control delivery of a cardioplegia fluid, which system has mechanisms for infusing said cardioplegia solution into a patient'"'"'s heart, said display panel and controls of said system comprising:

(a) a panel;

(b) a visible representation of alternative cardioplegia fluid delivery points in said patient'"'"'s heart, positioned on said panel, such visible representation including a delivery point in said patient'"'"'s aortic root for antegrade delivery and a delivery point in said patient'"'"'s coronary sinus for retrograde delivery;

(c) control means in said cardioplegia fluid delivery system, by which said delivery point in the patient'"'"'s heart may be alternative selected by said operator; and

(d) indicia means, coupled to said control means and positioned on said panel adjacent to said visible representation, for indicating whether said delivery point of said cardioplegia fluid is consistent with said retrograde delivery or said antegrade delivery.

57. A cardioplegia fluid delivery system as in claim 56 wherein:

(a) said visible representation includes a visible schematic depiction of a heart, including a schematic depiction of an aortic root and/or a coronary ostia on one side of said schematic depiction of the heart and a schematic depiction of a coronary sinus on another side of the schematic depiction of the heart;

(b) a first flow path representation line, positioned on said panel, beginning at a point adjacent to said schematic depiction of the heart and terminating at a point in said schematic depiction of an aortic root and/or a coronary ostia and a second flow path representation line, positioned on said panel, beginning at a point adjacent to said schematic depiction of the heart and terminating at a point in said schematic depiction of a coronary sinus; and

(c) wherein said indicia means comprises a first light positioned along said first flow path representation line, said first light indicating, when in an "on" state, that cardioplegia fluid is being delivered to said heart in an antegrade fashion and a second light positioned along said second flow path representation line, said second light indicating, when in an "on" state, that cardioplegia fluid is being delivered to said heart in a retrograde fashion.

58. A cardioplegia fluid delivery system as in claim 57 wherein said indicia means comprising said first and second lights further comprises a dynamic first set of lights and a dynamic second set of lights, such dynamic sets flash sequentially along said first and second path representation lines to visually depict movement of cardioplegia fluid toward the aortic root and/or coronary ostia or, alternatively, movement of cardioplegia fluid toward the coronary sinus according to said selection of antegrade delivery or retrograde delivery, respectively.

59. A cardioplegia fluid delivery system as in claim 57 wherein,

(a) said control means includes a selection valve mechanism and a selector means;

(b) said first flow path representation line corresponds to an antegrade cardioplegia feed line coupled to an antegrade catheter positioned within the aortic root of said patient'"'"'s heart, said antegrade feed line being operatively coupled to and selectable by said selection valve mechanism;

(c) said second flow path representation line corresponds to a retrograde cardioplegia feed line coupled to a retrograde catheter positioned within the coronary sinus of said patient'"'"'s heart, said retrograde feed line being operatively coupled to and selectable by said selection valve mechanism; and

(d) said selector means, positioned on said panel, permits said operator to select antegrade delivery or retrograde delivery to said patient'"'"'s heart, such selected delivery being (i) visibly indicated to said operator along said first or second flow path representation lines, and (ii) established by said selection valve mechanism to direct flow of said cardioplegia fluid through said selected cardioplegia feed line to such line'"'"'s respective catheter.

60. A cardioplegia fluid delivery system as in claim 59 further comprising:

(a) a valve position sensor at said selection valve mechanism for producing a signal representative of a position of said selection valve mechanism;

(b) a sensory input signal communicating between said valve position sensor and said selector means for automatically signaling said indicia means to display between said antegrade or said retrograde delivery corresponding to said position of said selection valve mechanism.

61. A cardioplegia fluid delivery system means as in claim 60 further comprising:

(a) a controllable valve positioning device connected to said selection valve mechanism;

(b) said sensory signal connector capable of providing control signals from said selector means to said controllable valve positioning device; and

(c) said selector means capable of generating control signals receivable by said valve positioning means for positioning said selection valve according to said selected delivery point.