Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
  • A61M39/22—Valves or arrangement of valves
  • A61M39/28—Clamping means for squeezing flexible tubes, e.g. roller clamps
  • A61M39/285—Cam clamps, e.g. roller clamps with eccentric axis
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
  • A61M1/34—Filtering material out of the blood by passing it through a membrane, i.e. hemofiltration or diafiltration
  • A61M1/3496—Plasmapheresis; Leucopheresis; Lymphopheresis

Definitions

• This application relates to a simple manual control system, for providing control to a fluid flow apparatus which typically performs a relatively complex series of fluid switching functions through multiple flow paths. Additionally, the control system of this invention can simultaneously control the electrical functions of the same apparatus, in correlation with the fluid flow functions, from a single control knob.
• a control member may be mounted on a door or other separable member of the apparatus, with means being provided so that the connec ⁇ tion of the control knob to the controlled elements may be disconnected and reconnected in a manner which does n permit disruption of the correlation of the position of the control knob with the controlled elements.
• switching means are provided for a flow system comprising a plural ity of flexible, collapsible flow conduits for the selec tive transfer of fluid through the conduit.
• the switchi means is adapted for selectively collapsing a plurality of separate sections of the conduit to block fluid flow through them, for the purpose of selectively defining specific variable fluid flow paths in the flow conduits.
• the switchi means defines a cam plate defining a generally flat face positioned adjacent portions of the flow conduits. Pivo means are provided, causing the cam plate to be rotatabl about an axis normal to the flat face. Cam members are carried on the flat face, with the cam members preferabl defining differing radii from the axis, for the purpose of permitting separate and independent control of a plur ality of flow conduits.
• the cam members are positioned to cause the pressurized collapse of a portion of the flow conduits, block fluid flow through such portion when the cam plate is in one rotational position, and to be disengaged in another rotational position from the pressurized,collaps relation caused by the cam member, to permit flow throug the portion when the cam plate is in the other rotationa
• a versatile, independent control of a plurality of flow conduits is provided.
• Multiple cam members may be placed at the same radii from the axis , if it is desired to close and open a specific flow conduit more than once during a • process cycle, with the cycle control being typically governed by a single 360° rotation of the cam plate. Accordingly, any desired pattern of flow modes may be defined in the plurality of flow conduits as the cam plate is rotated about its axis.
• the cam members are arcuate in shape, each cam member defining a generally constant radius about the axis.
• the flexible, collapsible flow conduits are typically positioned in interconnecting relation with a plurality of containers, and may also include conduit means for communicating with the venous sytem of a blood donor, for example, to provide a blood processing apparatus such as plasmapheresis apparatus, having multi- pie phases or cycles of operation as defined by the position of the cam plate.
• Shaft means typically connect the cam plate with a control knob, with the shaft means optionally defining a pair of separable members to permit mechanical connec- tion and disconnection of the cam plate and control knob by separation of the separable members.
• the separable members define shaped, mating portions at facing ends, permitting the connection of the shaft means by joining of the separable members only when the separable members occupy one specific relative rotational position. Accord ⁇ ingly, reconnection of the shaft means for operation of the control means is not possible unless the control knob is in proper rotational orientation with respect to the cam plate. Indicia may be placed in association with the control knob to show the mode of operation that the system is currently in.
• the shaft means may also connect with and oper ate rotary switch means, which may constitute a control for an electrical system utilized in the device. Accord ingly, the electrical functions controlled by the rotary switch means, the fluid flow functions controlled by the cam plate, and the rotational position of the control knob are all correlated on the shaft means when it is in the connected position.
• the separable members of the shaft are typi ⁇ cally utilized by placing one of the separable members and the control knob on a door member, which is hingedly attached to a housing for the remainder of the flow syst
• the door member may be opened, resulting in discon nection between the cam plate and the control knob, for access to the interior of the device, particularly the flexible conduits, which may be intended for one time us
• the door member may be closed, which can only take place through connection of the shaped, mating por ⁇ tions of the separable members when in proper relative rotational position, indicating proper rotational correl tion of the cam plate and control knob.
• Figure 1 is an elevational view, with portions broken away, of a control switch assembly for a flow system in an electrically operated plasmapheresis apparatus.
• Figure 2 is a sectional view taken along line 2-2 of Figure 1.
• Figure 3 is a perspective view of the apparatu of Figure 1 showing its interior, with the door member i open position.
• Figure 4 is a truth table, illustrating the positions of closure valves of Figures 1 and 2 during the six modes of operation of the specific plasmapheresi device.
• Figure 5 is a fragmentary, perspective view of a cam plate used in this invention, illustrating how the arcuate cam members may be attached to the cam plate to define arcs of generally constant radius about the axis of rotation.
• Figure 6 is a fragmentary, enlarged longitudinal sectional view of a portion of Figure 2, showing a valve assembly in a position closing flow through a flexible, collapsible flow conduit.
• Figure 7 is a fragmentary, elevational view showing a portion of the front face of the door assembly in closed position, and showing the control knob carried by said donor assembly.
• a flow control sys ⁇ tem is disclosed which may be utilized as part of any apparatus for controlling fluid flow, and including corre ⁇ lated control means for an electrical system for the same apparatus.
• the flow control system dis- closed may be utilized as part of a plasmapheresis apparatus as described in the application of Richard I. Brown, et al. filed concurrently herewith and entitled "Blood Fractionation Apparatus".
• Housing 10 may carry the flow control apparatus of this invention.
• Door member 12 is attached by hinges 14 to housing 10.
• a plurality of flexible, collapsible flow con ⁇ duits 16, 18, 20 and 22 are shown to be positioned in corresponding slots 24, 26, 28 for receiving the respec- tive flexible, collapsible flow conduits.
• the flow con ⁇ duits may be part of a disposable set or sets for the handling of blood plasma and saline solution during the operation of the plasmaphersis device.
• flexible conduit 16 may communi- cate at the top with a first source of saline parenteral solution, and at the bottom with the remainder of the fl circuits of the plasmaphersis apparatus.
• Flexible conduit 18 may communicate at its top with a second source of saline parenteral solution, and at the bottom with the remainder of the flow circuits.
• Flow conduit 20 may communicate at its top wit an empty container for collecting plasma extracted from whole blood by the plasmapheresis device, and at its bottom communicating with an enlarged, flexible chamber, as part of a disposable set which fits into a blood dete tion device, and which also connects with the remainder of the flow conduits.
• Conduit 22 communicates at one end with condui 20 through Y-connection chamber 30, as part of the dis- posable set, and leads at its other end to a bypass plas ma line for returning plasma to the donor.
• switching means including a cam plate 32, positioned behind wall 34 of housing 10.
• Cam plate 32 defines a generally flat face 35 which, in turn, may define a seri of concentric, annular grooves 36 for receiving separate preferably generally arcuate cam members 38, 38a posi ⁇ tioned in grooves 36, to define arcs of generally consta radius of about the axis of rotation 40 of the cam plate
• the pivoting means of cam plate 32 is provided by rotatable shaft means 42.
• Shaft means 42 defines a pair of separable members 44, 46, to permit mechanical connection and disconnection of the cam plate and contro knob 48.
• shaped mating portion 50 defines a generally V-shaped groove
• mating portion 48 is a projection from the end of member 44 shaped to fit within the V-shaped groove 50.
• cams 38 which are attached in predetermined positions within grooves 36 of cam plate 32, occupy differing radii from the axis of rotation 40, depending upon the specific annular groove 36 that they occupy.
• Two separate cams 38, 38a are shown in Figure 2 to occupy differing radii from axis 40.
• apertures 54 are provided in wall 34 of housing 10.
• Anvil members 56 are positioned on the inside of door member 12 so that
• Figure 4 illustrates a truth table which shows a typical mode of valving operation in the six different valving modes provided in the specific embodiment of the flow control system of this invention.
• the six modes ar as indicated on knob 48, with the system being shown in the "load” mode in Figure 7.
• the symbol “0” indicates an open position and "1” indicates a closed position. It can be seen that in this rotation position of knob 48 and cam plate 32 all of the valves are open, with each plunger 56 being in its retracted position, permitting flow through all of the tubes 16, 18, 20 and 22.
• cam 38 moves into engagement with the plunger 57 which controls flow through flexible conduit 20 to close flow through that line.
• cam plate 32 rotates to close conduits 16 and 18, while conduit 20 remains closed.
• cam plate 32 is rotated to close conduits 20 and 22, while the saline source conduits 16, 18 are opened.
• cam plate 32 is rotated to close only conduit 20, so that a flow path leads through conduit 22 for reinfusion of plasma to the donor.
• Shaft member 42 communicates as shown in Figure 2 with shaft extension 60, with a connection which does not permit relative rotation between extension 60 and the rest of shaft 42.
• Shaft extension 60 communi ⁇ cates with rotary switch 62, of conventional design, to provide appropriate multiple switching modes to the elec- trical components of the plasmapheresis device in a manner which correlates with the rotational position of cam plate 32 and knob 48.
• Rotary switch 62 may be connec ⁇ ted to any desired number of 'leads which, in turn, connect
• Door 12 is selectively latched so that it can only open in the "load” mode as indicated by knob 48, as follows.
• Projection 64 carried by wall 34 of housing 1 defines a latching groove 66 about at least a portion, of its periphery.
• disc member 68 Positioned on separable member 46 of shaft 42, behind knob 48, is disc member 68, defining a generally circular periphery 70 about the majority of its peripher and further defining a cutaway portion 72 at one portion of its periphery.
• the periphery 70 of disc member 68 engages locking groove 66, thus preventing opening of the door.
• cutaway portion 72 is positioned adjacent projecting mem ber 64 so that there is no engagement of disc 68 in groo 66, and the door is unlatched for opening.
• Added manual safety latch 72 is also provided to hold door 12 in locked position.
• a flow control system in accordan with this invention which permits complex an multiple valving functions throughout a plurality of flo modes, while at the same time providing simultaneous, correlated electrical switching for operation of the ele trical components of a system.
• the control knob for this system may be mounted on a door so as to b separable from the remainder of the system, but may be reliably brought back into connection upon closing of th door without rotational misalignment of the control knob

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• Health & Medical Sciences (AREA)
• Heart & Thoracic Surgery (AREA)
• Hematology (AREA)
• Engineering & Computer Science (AREA)
• Anesthesiology (AREA)
• Biomedical Technology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Pulmonology (AREA)
• Vascular Medicine (AREA)
• External Artificial Organs (AREA)

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Citations (7)

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• 1981
  • 1981-03-16 JP JP56501605A patent/JPS57500632A/ja active Pending
  • 1981-03-16 EP EP19810901223 patent/EP0050147A4/en not_active Withdrawn
  • 1981-03-16 BR BR8108315A patent/BR8108315A/pt unknown
  • 1981-03-16 WO PCT/US1981/000335 patent/WO1981002980A1/en not_active Ceased
  • 1981-03-24 CA CA000373735A patent/CA1144037A/en not_active Expired
  • 1981-04-10 IT IT8121080A patent/IT1137339B/it active
  • 1981-04-13 BE BE0/204461A patent/BE888390A/fr unknown

Patent Citations (7)

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