Cassette for flow control apparatus

Abstract

To provide a cassette for use with a flow control apparatus.SOLUTION: A pump set for use with a pumping apparatus includes a tube for carrying liquid. A valve mechanism is mounted to the tube between an inlet section and a pump engagement section. The valve mechanism includes a first port connected to the inlet section of the tube, a second port connected to the pump engagement section of the tube, and a valve disposed between the first and second ports. The valve includes a stem 68 rotatably mounted within a stem holder. The stem includes a flow passage 88 extending through the stem and having an open-V shape, whereby a narrow open end of the flow passage communicates with the first port and a wide open end of the flow passage communicates with the second port to place the inlet section of the tube in communication with the pump engagement section of the tube.SELECTED DRAWING: Figure 13B

Description

[Technical Field]

[0001] The present invention generally relates to a flow control system including a flow control device and a supply set, In particular, it relates to cassettes used with flow control devices. [Background technology]

[0002] Administration of medicines or nutrients to patients who cannot take medicines or nutrients orally is performed using peristaltic flow control. This can be done by using a flow control system. The body is mounted on a flow control device, such as a peristaltic pump, which delivers fluid to the patient at a controlled delivery rate. The fluid is delivered to the patient by a pump set containing a flexible elastomeric tube. The pump typically includes a housing containing a rotor that operably engages a motor through a gearbox. The rotor has a rib that is generated by impact, e.g., squeezing, on the rotor by one or more rollers. The flexible tubing of the pump set is compressed by the peristaltic action caused by the reversible compression of the The rotation of the rotor drives the fluid through an elastomer that drives the fluid at a controlled speed. - Gradually compress the tubing. The pump set allows fluid flow through the pump set. The flow control system may also include a valve mechanism to allow or prevent the flow of fluid. The fluid flow control system includes a controller that operatively regulates one or more motors that effectively control the flow of fluid. It is possible.

[0003] Peristaltic pumps work by delivering fluid in small amounts called "aliquots." The rotor engages the elastomer tubing of the pump set, For example, the fluid flow is directed forward of the clamped position, closer to the patient than the source of the fluid going to the patient. Generally, the volumes of fluid to be administered to a patient are each pumped in substantially the same volume. Count the number of aliquots that are the product of the total volume of fluid desired to be delivered. The pump is controlled internally by stopping when a certain volume is reached. Because they are dynamic and generally accurate, they are extremely useful for administering drugs and therapeutic fluids to patients. do. Summary of the Invention [Means for solving the problem]

[0004] In one aspect, a pump set for use with a pumping device generally comprises: The tube has an inlet section for connecting to a liquid source and a chuck section for connecting to a liquid source. a pump configured to engage a pumping device to pump liquid through the tube; and an engagement section. The tube is connected between the inlet section and the pump engagement section. The installed valve mechanism has a first port connected to the inlet section of the tube and a second port connected to the a second port connected to the pump engaging section of the tube; and a second port connected to the first port and the second port. and a valve disposed between the first port and the second port. The valve selectively connects the first port to the second port. The stem includes a rotatable stem for moving the flow channel from the inlet end of the flow channel to the outlet end of the flow channel. a flow path extending through the tube, thereby connecting the inlet section of the tube to the pump The inlet end of the flow passage communicates with the first port and the outlet end of the flow passage communicates with the engagement section. The first port communicates with the second port. The flow passage has a cross-sectional area that increases from the inlet end to the outlet end.

[0005] In another aspect, for use in a cassette configured to attach to a pumping device. The fitting assembly generally includes a first port, a second port, and a and a valve disposed between the first port and the second port. a stem rotatably mounted for selective communication with the inlet end of the flow channel; a flow passage extending through the stem from the inlet end of the tube to the outlet end of the flow passage, thereby The inlet end of the flow passage is connected to a first port for communicating the port with the pump-engaging section of the tubing. The flow passage has an outlet end communicating with the second port, and an outlet end of the flow passage communicates with the second port. The flow passage extends from the inlet end to the outlet end. The cross-sectional area increases.

[0006] In yet another aspect, a cassette for use with a pumping device generally comprises: The pumping device is adapted to be removably attached to the pumping device for attaching the pump to the pumping device. and a fitting removably attachable to the body. The fittings are arranged between the first port, the second port, and the first and second ports. The valve selects the first port from the second port. The stem includes a first port and a second port. The fitting is connected to the pumping device when the stem is rotated to communicate with the two ports. It includes a flange configured to engage a catch on the pumping device for securement.

[0007] In yet another aspect, a cassette for use with a pumping device generally comprises: The pumping device is adapted to be removably attached to the pumping device for attaching the pump to the pumping device. The body has a front, a rear, an upper part, a lower part, and a lower part from the upper part of the body to the lower part. The fitting is attached to the body. The cassette has an inlet port for attaching the inlet tubing to the cassette and an outlet port for attaching the outlet tubing to the cassette. and an outlet port for attachment to the set. The outlet port is recessed from the top of the body. The curved guide wall supports the outlet tube to prevent twisting of the outlet tube. It extends adjacent to the outlet port of the fitting. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a feeding system having a pumping device, a fragmentary portion of a feeding set, and a cassette.

[0009] [Figure 2] FIG. 2 is a perspective view of the system of FIG. 1 showing the pumping apparatus but with a portion of the cassette removed.

[0010] [Figure 2A] 3 is a fragmentary view of the perspective view of FIG. 2 with portions of the supply set and cassette removed.

[0011] [Figure 3] FIG. 2 is a perspective view of FIG. 1 without the supply set and cassette.

[0012] [Figure 4] FIG.

[0013] [Figure 5] FIG.

[0014] [Figure 6] FIG.

[0015] [Figure 7]FIG. 10 is a rear perspective view of the cassette with the fitting assembly removed from the cassette.

[0016] [Figure 8] FIG. 1 is a front perspective view of a fitting assembly.

[0017] [Figure 9] FIG. 10 is a rear perspective view of the fitting assembly.

[0018] [Figure 10A] FIG. 1 is a top view of the fitting assembly.

[0019] [Figure 10B] FIG. 10 is a front perspective view of the fitting assembly with the stem of the stopcock removed.

[0020] [Figure 11A] 1A and 1B are rear and side perspective views of the stem.

[0021] [Figure 11B] 1A and 1B are front and side perspective views of a stem.

[0022] [Figure 11C] FIG.

[0023] [Figure 12] FIG.

[0024] [Figure 13A] FIG. 10 is a side cross-sectional view of the fitting assembly showing the stem in a fluid flow blocking orientation.

[0025] [Figure 13B] FIG. 10 is a side cross-sectional view of the fitting assembly showing the stem in a cleaning position.

[0026] [Figure 13C]FIG. 10 is a side cross-sectional view of the fitting assembly showing the stem in a fluid delivery configuration.

[0027] [Figure 14] FIG. 10 is a perspective view of another embodiment of a cassette.

[0028] [Figure 15] FIG. 15 is an exploded view of the cassette of FIG. 14.

[0029] [Figure 16] FIG. 15 is an elevational view of a portion of the supply set of the cassette of FIG. 14.

[0030] [Figure 17] FIG. 17 is a vertical cross-sectional view of the feeding set of FIG. 16.

[0031] [Figure 18] FIG. 10 is a perspective view of another embodiment of a cassette.

[0032] [Figure 19] FIG. 19 is an exploded view of the cassette of FIG. 18.

[0033] [Figure 20] FIG. 19 is an elevational view of a portion of the supply set of the cassette of FIG. 18.

[0034] [Figure 21] FIG. 21 is a vertical cross-sectional view of the feeding set of FIG. 20.

[0035] [Figure 22] FIG. 10 is a perspective view of another embodiment of a cassette.

[0036] [Figure 23] FIG. 23 is an exploded view of the cassette of FIG. 22.

[0037] [Figure 24] FIG. 23 is an elevational view of a portion of the supply set of the cassette of FIG. 22.

[0038] [Figure 25] FIG. 25 is a vertical cross-sectional view of the feeding set of FIG. 24.

[0039] Corresponding reference numbers indicate corresponding parts throughout the drawings. DETAILED DESCRIPTION OF THE INVENTION

[0040] One or more aspects of the present invention relate to peristaltic pumps, such as rotary peristaltic pumps, and in particular to pumps for multiple flow applications. A rotary peristaltic pump utilizing a cassette with valves for selecting from a range of flow configurations. The cassette also has a structure that prevents kinking of the outlet tube attached to the cassette. Any one or more advantageous features that provide or promote any one or more of these features. The invention provides a method for implementing various features or structures in peristaltic pumps used in a variety of commercial and industrial applications. Therefore, the detailed description will be directed to enteral feeding pumps with cassettes. However, any one or more features of the present invention may be implemented in other peristaltic pumps, with or without a cassette. For example, the pumps illustratively described may be circulating. Although the present invention is directed to a peristaltic enteral feeding pump, it is also applicable to other types of peristaltic pumps, including medical infusion pumps. This also applies to enteral feeding pumps (not shown). The general structure and operation of enteral feeding pumps is described below. Except as otherwise stated, the "FLOW CONT" published on October 27, 2009 Co-assigned U.S. Patent No. 7,608, entitled "ROL APPARATUS" Issue 059, August 15, 2006, "FLOW MONITORING SY The title is "STEM FOR A FLOW CONTROL APPARATUS" No. 7,092,797 issued on May 19, 2009, and U.S. Patent Application Publication No. 2009-01-199944 issued on May 19, 2009. QUOT CORRECTION FOR FEEDING SET DEGRADAT ION" The disclosures of which are incorporated herein by reference. One or more of the various features and aspects of the present invention may be combined with other components than rollers without departing from the scope of the present invention. This can be implemented in a peristaltic pump, such as a linear peristaltic pump, using a mechanism. Although an exemplary feeding set 7 is shown, other types may be used without departing from the scope of the present invention. A pump set (not shown) can be used.

[0041] Referring now to the drawings, and particularly to FIGS. 1-3, there is shown a system constructed in accordance with any one or more of the principles of the present invention. An exemplary enteral feeding pump (broadly referred to as a "pumping device") is generally designated 1. The nutrient pump is configured to receive a cassette generally designated 5. The housing, shown as 3, is the body of the pump, and the supply set (broadly speaking, the "pump set") and cassette. and a segmental part generally designated 7, which is removably received within the slot 5. The cassette 5 is removably mounted in the housing 3. In an embodiment, the cassette 5 is removably mounted in a cassette recess 6 (FIG. 3) in the housing 3. It should be understood that "housing" as used herein refers to a multi-part This includes, but is not limited to, structures that do not enclose or house the working components of the pump 1. The present invention may include many forms of support structure (not shown), but is not limited to the specific embodiment. In this case, the pump 1 and the pump set 7 form a "supply system." Some aspects and features may be implemented without the recess 6. The pump 1 may also include a housing 3 It has a display screen 9 on which information about the status and operation of the pump can be displayed. A display screen can be used to control and obtain information from Pump 1. One or more buttons 11 accessible to the switch 9 may be provided, and one or more light emitting diodes 13 can provide pump status information for easy viewing by the user or operator. In order to support the housing so that the display screen 10 is tilted slightly upward, At the bottom of the bag 3, feet (not shown) can be arranged.

[0042] The display screen 9 is part of the front panel (generally designated 19) of the housing 3. The enteral feeding pump 1 can be removably attached to the housing. The pump motor (not shown) is connected to a pump (not shown). The pumping unit shown may further include a pumping unit for powering the pump motor. A battery (not shown) can be received in the housing 3 for this purpose. Pumping unit through the rotor shaft using external or additional power source A pump including one or more prime movers driving the

[0043] The pumping unit 23 comprises a rotor (generally designated 37) which may be coupled to a rotor shaft. The rotor 37 may include an inner disk 39 and an outer disk 41. and an inner disc for free rotation relative to the disc about the longitudinal axis of the disc. Four rollers 43 (only three of which are shown) mounted between the outer disc and the 2 and 3. The roller 43 is configured to When the cassette 5 is received by the cassette feeder 5 and the cassette 5 is attached to the housing 3, the supply set 7 2 to deliver fluid to the subject through the feeding set 7. Any number of rollers are contemplated, for example, five or six rollers, without departing from the scope of this disclosure. A roller may also be used.

[0044] 4-7, the cassette 5 has a front portion 53, a rear portion 55, an upper portion 57, and a lower portion 59. The cassette body 51 may have a side wall 61 and a top wall 63. A rear cap extends from the rear 55 of the body 51 and is configured to receive a fitting 65. The tube 45 is attached to the fitting 65. The fitting 65 is secured or snapped onto the cassette. In some cases, the fitting may have a tab that allows it to be attached to the cassette. The device can be removably fixed to the base 5.

[0045] The fitting 65 includes a base 67, an inlet 69, an outlet 71, and a stem holder 66. The inlet 69 may include a first fitting 73 for insertion into the inlet end of the tube 45. and a pair of second mounting portions 75A, 75B for receiving an inlet tube 77 (FIG. 2). The outlet port 71 may be inserted or otherwise engaged with the outlet end of the tube 45. The outlet tube 83 is connected to a first fitting 79 for attachment to the outlet tube 83. and a second fitting 81 for attachment to the outlet tube 83. The opening of the second mounting portion 81 for receiving the tube 3 is The outlet tube 83 may also be funnel-shaped or tapered away from the fitting 81. The tube may be treated with a solvent to soften it for insertion and bonding with fitting 81. The second attachment portion 75A can be in fluid communication with a supply source (e.g., a nutritional solution bag), and the second attachment portion 75B can be in fluid communication with a supply source (e.g., a nutritional solution bag). The second fitting 75B is connected to a cleaning source (e.g., a cleaning fluid bag) via an inlet tube 77. To aid in identifying the preferred attachment of the fluid source, a second attachment portion The second mounting portion 75A extends above the second mounting portion 75B. The second attachment portion 75A can be easily identified as the supply port. 5B may be attached to a supply source and second fitting 75A may be attached to a cleaning source.

[0046] The tube 45, fitting 65, inlet tube 77, and outlet tube 83 are connected to the port. The cassette 5 may be considered as part of the pump set 7. In a preferred embodiment, the cassette 5 is made of a polycarbonate or other suitable material. Made from polymer material.

[0047] 8 to 13C, the stopcock 64 is attached to the stem of the fitting 65. The stem 68 is received in a cylindrical receptacle 70 within the holder 66. 68 configures the pump set in either a fluid delivery configuration, a flushing configuration, or a fluid flow blocking configuration. In order to selectively connect the second mounting portions 75A and 75B to the first mounting portion 73, an opening 7 The second mounting portions 75A and 75B are movable (i.e., rotatable) within the The first fitting 73 has an outlet that communicates with the opening 70 of the fitting 65. In one embodiment, the stopcock 64 is sized to The outlet of the second mounting portion 75A is a non-uniform circular shape to increase the outlet area without increasing the size. For example, the exemplary oval exit shown in FIG. 10A may be Allows thicker, more viscous feed solutions to be pumped with Pump Set 7 without increasing the stopcock size. The stem 68 is inserted through a first opening 74 ( 11A) and a second opening 76 (FIG. 11B). The mouth 74 has a circular shape and the second opening 76 has a first dimension that intersects with a second orthogonal In the illustrated embodiment, the second opening 76 is elongated so as to have a dimension greater than that of the first opening. The slot dimension is longer than the diameter of the mouth 74. The first and second openings 74, 76 are generally The second mounting portions 75A, 75B are disposed on both sides of the stem body 72, and the fluid flow through the stem 68 is The first mounting portion 73 may be formed on the same or similar planes so that they extend downward from the first mounting portion 73 to the first mounting portion 74 in a substantially single plane. The electrodes are arranged so as to be in approximately the same plane (FIG. 12 and FIGS. 13A-C). More specifically, Fluid flows through the stem 68 along a single axis from the first opening 74 to the second opening 76. This allows the valve to be In other embodiments, the configuration of the openings 74, 76 can be reversed.

[0048] A flow passage 88 extends within the body 72 of the stem 68 from the inlet end of the first opening 74 to the second opening 76. The flow passage 88 widens, thereby increasing its cross-sectional area from the first opening 74 to the second opening 76. 2 opening 76. Channel 88 gives the channel a generally inversely distorted V-shape. The curved inner wall 92 may include a curved inner wall 92 that extends from the first opening 74 to the second opening. A first section 130 that expands at a generally constant rate to the end of the first section, The second section 132 extends non-uniformly from the end of the first section 130 to the end of the second section 132. The rate at which the second section 132 expands is determined by the amount of the second section 132 at the end of the second section 132. The third section 134 increases from the second section 132 to the third section The rate at which the third section 134 expands varies depending on the end of the third section 134. The fourth section 136 is the first section from the third section 134. The stem 68 and the stem holder 66 generally expand at a constant rate from the first opening 76 to the second opening 76. , can be considered as a valve mechanism.

[0049] The contour of the flow passage 88 provides benefits in the molding process of the stem 68. In particular, The modified "V" shape provides a good interface between the flow passage and the cylindrical outer surface on each side of the stem 68. The wall thickness between the two can be kept smaller. Thinner wall thickness results in a more consistent outer surface. This helps maintain the cylindrical shape when the stem 68 is in the fluid flow blocking configuration. A gap is generated between the stem 68 and the stem holder 66, and the fluid between the second attachment portions 75A and 75B The stem 68 prevents the outer surface from shifting, allowing for the flow of fluid. The flow path having a shape (represented by the dashed lines in FIG. 12) may cause misalignment around the stem 68. around the flow channel 88, generally near the middle of the flow channel, which are too large to be produced in the molding process without However, the thickness of the stem at the inlet end (opening 74) and the outlet end (opening 76) and one or more sections intermediate the width (and therefore cross-sectional area) of the By contouring the flow channel 88 to accommodate the flow, the maximum wall thickness is The thickness of the second section 132 is reduced to a thickness that maintains its shape. The wall thickness of the stem 68 around the fourth section 134 and the fourth section 136 is such that the flow passage is This thinner wall thickness is smaller than if the stem 68 follows a "V" profile. This allows the stem 68 to be molded without causing any irregularities in the surface.

[0050] As shown in FIG. 11B, a flange 78 projects radially from the body 72 of the stem 68. , extending partially around the circumference of body 72. In one embodiment, flange 78 is generally sector-shaped The body 72 defines a cavity 80, which accommodates the shaft 93 (see FIG. 3) engages the body of the stem 68 to rotate the body within the opening 70. 8 is a recess in the pump 1 to prevent removal of the supply set 7 when the valve is open 6. The hook 108 is configured to engage with the hook 108 (FIGS. 2A and 3). When the cassette 5 is attached to the pump 1, the recess 110 of the stem holder 66 (FIG. 1) 0B), thereby allowing the flange 78 to contact at least a portion of the hook 108. As will be explained in more detail below, the movement of the stem 68 When the valve is open, the flange 78 is positioned behind the hook 108 to allow the supply set This safety feature prevents uncontrolled discharge that could potentially be harmful to the patient. This prevents a free flow condition in the feeding set 7, which would result in too much fluid being delivered to the patient. The flange 78 provides a stop to limit rotation of the stem 68, as further described below. The fitting 65 and stem 68 together form the fitting. The fitting assembly 82 can be considered as a fitting assembly 82. Remove the body flow selection valve from the inlet tube 77 and place it into the body of the cassette 5. do.

[0051] In the configuration shown in FIGS. 8 and 13A, the fitting assembly 82 is The main body 72 prevents the outlets of 75A and 75B from communicating with the opening 70 and the inlet of the first mounting portion 73. For example, the shaft 93 of the pump 1 engages the cavity 80. Rotation of the stem 68, such as by rotating the body 72 clockwise within the opening 70, , the first opening 74 is connected to the outlet of the second mounting portion 75B, and the second opening 76 is connected to the outlet of the first mounting portion 75C. 3, thereby connecting a fluid source connected to second fitting 75B to tube 4. 5 to the outlet 71 and the outlet tube 83 (FIG. 13B). 5A remains disconnected from the first mounting portion 73. Also, the stem 68 is moved from the closed position When the supply set 7 is rotated from the first position to the second mounting portion 75B, the first opening 74 is connected to the outlet of the second mounting portion 75B. The flange 78 is attached behind the hook 108 of the pump 1 to prevent it from being removed from the pump 1. Further rotation of the stem 68 moves the first opening 74 into the second mounting portion 75. A, the second opening 76 remains in communication with the inlet of the first mounting portion 73, This allows the fluid source connected to the second mounting portion 75A to be connected to the outlet 71 and The second opening 76 is connected to the outlet tube 83 (FIG. 13C). , at least a portion of the second opening is in contact with the entrance of the first mounting portion 73 throughout the entire movement of the stem 68. and connects the first opening 74 to the outlets of the second attachment portions 75A and 75B. At this time, the second mounting portion 75B is disconnected from the first mounting portion 73. A stop 94 on the stem holder 66 engages the flange 78 to hold the body within the opening 70. Limit the rotation of the

[0052] 5 to 7, the second attachment portion 81 of the outlet 71 of the fitting 65 is Before the tube 83 is inserted into the second mounting portion 81, it is arranged so as to extend downward within the cassette body 51. 5. The cassette 5 is recessed from the top 57 of the cassette 5. This allows a portion of the outlet tube 83 extends adjacent to a curved guide wall 96 that extends downward from the upper wall 63. provides a gradually decreasingly inclined arcuate surface for the outlet tube 83 to rest on, and The lateral edges prevent the tube from bending sharply. As a result, the outlet tube 83 This prevents kinks that could impede fluid flow through the outlet tube. 3 between the top 57 of the cassette 5 and the attachment of the tube to the fitting 65. The second fitting 81 is inserted into the second fitting 81, which may have been softened by the solvent treatment. The portion of the tube that is removed is not located where the tube is subjected to bending forces. The portion is spaced from the top 57 of the cassette 5 and is kept generally straight by the curved guide wall 96. This further reduces the possibility of the outlet tube 83 becoming kinked or pinched. It will be reduced.

[0053] As illustratively shown, tabs 84 (FIGS. 8 and 9) extend from the sides of base 67. 1 and 4) in the front 53 of the cassette 5. and configured to removably attach the fitting 65 to the cassette 5. A pair of guide ramps 91 (FIGS. 6 and 7) in the side wall 61 guide the opening 86 The tabs 84 on the fitting 65 may be funneled along the slope 91. and is received in opening 86 to retain the fitting in cassette body 51. The stem holder 66 of the fitting 65 is formed in the body 51 of the cassette 5. The fitting 65 is received in a valve holder 98 (FIG. 7). Alternatively, the fitting 65 may be a cassette. It may be integrally formed with the main body 51 or omitted.

[0054] 5 and 7, the notches 85A and 85B are located at the inlet 6 9, second fittings 75A, 75B and outlet tube 83, respectively. A positioning wall 87 may be formed on the top wall 63 of the cassette body 51. A generally U-shaped wall 89 can extend generally along the cassette body between the side walls 61. The base 67 of the fitting 65 is U-shaped with the positioning wall 87. The base 67 is received between the shaped wall 89 of the cassette 5 and the fitting 65. 89. The vertical projection 89 engages with the lower portion of the positioning wall 87 and the upper portion of the vertical projection 89 of the U-shaped wall 89 to position the It is possible.

[0055] When the cassette 5 is attached to the housing 3, at least one of the rotors 37 of the pump 1 The arcuate wall 9 is formed to at least partially define a rotor recess 97 for receiving a portion of the rotor. The rotor recess 97 may be disposed approximately in the center of the cassette body 51. The inlet and outlet outer curved guides may include a bump-out 99 at the front 53 of the guide (FIG. 4). Door walls 101 may extend generally parallel to either side of arc wall 95. The curved guide wall 103 extends upward from the arc wall 95 to the inlet and outlet outer curved guide wall 101. extending generally parallel to each other for receiving and supporting the inlet and outlet portions of the tubes 45, respectively. The guide walls 101, 103 and the arc wall 95 form the inlet and outlet openings. When the cassette 5 is attached to the housing 3, the tube is fitted to the rotor 37. a tube channel for receiving the looped lower portion of the tube 45 for proper placement; The arc wall 95 and the curved guide walls 101 and 103 form the rotor. The tube can be received in a tight fitting relationship around the sides of the recess 97. extends over the tube channel 114 to hold the tube 45 within the tube channel 114. and holds the tube 45 within the cassette, restraining the tube according to the third axis. The outer curved guide wall 101 guides the tube 45 at the bottom of the rotor recess 97. Generally below the rotor recess 97 so as not to directly face the walls 101, 103 or the arc wall 95. It can be terminated.

[0056] To help secure the cassette 5 and tube 45 within the cassette recess 6, an insert The insert 105 can be received in the cassette recess 6 in the housing 3 (FIG. 3). The insert 105 is bayonet-mounted when the cassette 5 is attached to the housing 3. The cassette 5 is positioned above the guide walls 101 and 103 so that it can be received in the rear cavity of the cassette 5. The insert 105 can be placed in the recess 6 as shown in FIG. a pair of opposing first protrusions 107 disposed on the inlet side of the insert for receiving the tube; a pair of opposing second projections disposed on the outlet side of the insert for receiving the outlet portion of the 109. The rib 111 (FIGS. 6 and 7) on the rear portion 55 of the cassette body 51 may be provided. 7) engages the outlet portion of the tube 45 between the second projections 109 and inserts the outlet portion between the projections. Indicia indicating the direction of fluid flow within the tube 45 may be positioned to aid in the entry of fluid into the tube. 112 may be disposed on at least one of the second protrusions 109. In the illustrated embodiment, The symbol 112 is in the shape of an arrow.

[0057] 5-9, the stator member 113 is generally located at or near the bottom of the rotor recess 97. The cassette body 51 is placed in a cavity such as the stator opening 115 located nearby. Therefore, when the cassette 5 is attached to the housing 3, the stay The rotor member 113 is generally located generally opposite the bottom of the rotor 37. The data member 113 serves as a roller 43 when engaging the tube, as described below. Optionally, the stator member 11 may support the tube 45 of the supply set 7. 3 may have an arcuate shape extending along the length of the stator member. As in the previous embodiment, the stator member 113 is fixed to the cassette body 51 only at the first end. and at least partially free within the stator opening 115 relative to the cassette body 51. As shown, the flexible stator member 113 can be a floating cantilever member. The roller 4 can pivot about a connection or anchor to the rest of the cassette 5. 3. For example, the stator member may be partially or completely flat when engaged with It may have a first end secured to the cassette body and a second end that is not secured. The second end has a surface of the stator member that allows the reaction segment to have a deflection displacement. For example, at least one roller may be As it traverses along the tube while rotating about the rotation axis of the rotor, the flexible stator member 11 3 is the force exerted by one or more rollers 43 during the rotation of the rollers about their axes of rotation The actuator may be displaced or deflected into a deflection displacement in response to a force.

[0058] Transverse ribs 116 on the underside of the first portion provide structural rigidity to the flexible stator member 113. The flexible stator member can be removed by ejecting it from the mold cavity. In the illustrated embodiment, the flexible stator The member 113 may be formed integrally with the cassette body 51. However, flexible steel The data member 113 is formed separately from the cassette body 51 and attached to the cassette by suitable means. For example, a flexible stator (not shown) may be attached to the cassette body. The engagement cavity may have an elongated extension portion that engages with the engagement cavity of the The stator member is sized and shaped to receive the extension accordingly. is selected from multiple candidates with different mechanical properties such as elastic modulus and radius of curvature, and the tube characteristics are The cassette operating parameters may be adjusted to control the pump operation with or without consideration of either The fluidity of the fluid can be increased by providing specific flow performance attributes.

[0059] The stop 117 is located on the bottom of the stator opening 115 to prevent the flexible stator member 113 from The stop 117 limits the floating movement to a maximum displacement. against the underside of the flexible stator member 113 to prevent bending of the stator member causing For example, the stop members may be spaced apart to provide a deflection displacement distance of the free end. In the illustrated embodiment, stop 117 may be positioned to limit the magnitude of the maximum displacement. However, the stop 117 is formed as part of the cassette body 51. It may be formed separately from the set body 51 and attached to the cassette body in an appropriate manner. In other cases, the stops 117 are formed in the housing 3 and are attached to the flexible stator member 113. The stop 117 may be configured to limit the displacement of the stator portion to a maximum displacement. The width of the flexible stator member 113 is adjusted to provide sufficient surface area to restrict material movement. The stop 117 may have a width greater than that of the flexible stator member 113. This can help shield the member 113 and generally reduce the possibility of it getting caught or caught. The dimension is such that the ion exchange reaction is prevented or reduced.

[0060] Before installing the cassette 5 in the pump housing 3, the inlet tube 77 and the outlet tube The cassette can be fitted with a pair of nozzles 83 at the inlet 69 and outlet 71, respectively. 5 to the pump housing 3, one or more of the lower portions 59 of the cassette body 51 The pin or raised protrusion 119 is inserted into the slot 124 at the bottom of the recess 6 of the housing 3. The engagement of the raised projections 119 with the slots 124 generally allows the cassette 5 to The cassette body 51 is then placed in the housing 3. The ledge 123 of the tab 125 is captured by the catch 127 at the top of the recess 6. In the illustrated embodiment, the raised protrusion 119 and ledge 123 However, the raised protrusion 119 and ledge 123 is formed separately from the cassette body 51 and attached to the cassette body in an appropriate manner. To remove the cassette 5 from the pump housing 3, press the tab 125. It can be lowered to disengage shelf 123 from catch 127.

[0061] When the cassette 5 is attached to the pump housing 3, the tubing 45 of the supply set 7 The rollers 43 of the pump 1 are arranged to engage the flexible stator member The roller 43 engages the tube 45 at the portion of the tube supported by 113. By engaging the rod 45, the flexible stator member 113 is deflected away from the roller. Specifically, this movement causes the tube 45 to move slightly toward a more straight configuration. The roller 43 closes the tube in a semi-straight manner. Therefore, the tube 45 can be moved in the same way as the rollers of conventional pumps. Instead of pulling and stretching, the roller 43 slides along the tube, reducing tension. As a result, the roller 43 closes the actual straight line of the tube 45. Produces an aliquot that matches the dimensions. Therefore, the calculated aliquot volume for Pump 1 more closely matches the actual aliquot volume produced by the pump, resulting in more accurate delivery results.

[0062] 14-17, another embodiment of a pump set is generally designated 7'. The pump set includes a cassette 5' including a cassette body 5G and a pump body receiving the pump. A fitting 65' that can be inserted and a stem that can be movably received within the fitting 68' and a fitting assembly 82' including a chuck 68' attached to the fitting. The cassette 5' is provided with a fitting 65', in particular a fitting This is the same as the cassette of the first embodiment except for the configuration of the second attachment portion 8G of the outlet 7G. In this embodiment, the second mounting portion 8G extends laterally away from the inlet 69' and The outlet tube 83' extends through a notch 102' in the side wall 6G of the second mounting portion 5'. 5G of the cassette 5'. The laterally extending outlet tube 83' is connected to the outlet tube 83 extending vertically upward from the second mounting portion 8G. This provides a more kink-resistant orientation than the tube. The downward force generated by the flowing fluid reduces bending of the laterally extending outlet tube. This reduces the likelihood of kinks forming. Bend downward from the cassette 5' to reach the patient, so the outlet tubing is By extending the tube laterally from the The tube is directed to a location that is better suited to reach.

[0063] 18-21, another embodiment of a pump set is generally designated 7''. The pump set includes a cassette 5 ″ including a cassette body 51 ″, and a cassette body Acceptable in fitting 65" and movable in fitting a fitting assembly 82'' including a stem 68'' attached to the fitting; The cassette 5'' has a fitting 65'' , and is similar to the cassette of the previous embodiment, except in particular for the configuration of the outlet 71 ″ of the fitting. In this embodiment, the outlet 71'' has an angled arcuate portion 104'' and an arcuate portion 105''. and a flow guide 106'' received within the arch-shaped portion. The outlet 71 of the fitting 65 is closed by the arched portion 104. Tube 45" has an open top that provides an arcuate flow path through the tube. The portion connects to the first mounting portion 79'' of the flow guide 106'' and the second mounting portion of the flow guide. The arched shape of the outlet 71'' allows the second The mounting portion 81'' extends downward through an opening 102'' in the front 53'' of the cassette 5''. The outlet tube 83'' is received in the second fitting 81 and extends to the cassette 5''. The downwardly extending outlet chuck 51 extends adjacent to the front portion 53'' of the housing 51''. The tube 83'' is longer than the outlet tube that extends vertically upward from the second mounting portion 81''. This provides a kink-resistant orientation due to the fluid flowing through the outlet tube 83''. The downward force generated by this reduces the bending of the exit tube, which is already pointing downward. , which reduces the likelihood of kinks forming. must bend downward from cassette 5 to reach the patient, so By having an outlet tube extending downward from the nozzle, the weight of the fluid can be used to This prevents the tube from kinking and directs the tube to a better position to reach the patient.

[0064] 22-25, another embodiment of a pump set is generally designated 7'''. The pump set includes a cassette 5''' including a cassette body 51''' and a cassette Fitting 65'' that is received in the body of the valve and a fitting that is movably received in the fitting a fitting assembly 82''' including a stem 68''' that is inserted into the fitting; The cassette 5''' is provided with a tube 45''' attached to the fitting. The previous embodiment, except for the configuration of the fitting 65''', in particular the outlet 7G'' of the fitting. In this embodiment, the outlet 71''' has an arcuate portion 104' and a flow guide 106''' received on the arched portion. The shaped portion 104''' is closed by a flow guide 106''' to form a fitting 6 5''' has an open top that provides an arcuate flow path through the outlet 7G''. The downstream portion of the tube 45''' connects to the first attachment portion 79''' of the arched portion 104'''. , the second attachment portion 8'' of the arched portion connects to the outlet tube 83'''. The arch shape of the second mounting portion 8G'' allows the second mounting portion 8G'' to fit into the opening in the lateral protrusion of the cassette 5'''. The outlet tube 83'' extends downward through the second mounting portion 81''. and extends downward adjacent to the side wall 6G'' of the cassette 5''. The outlet tube 83''' extends vertically upward from the second mounting portion 8G''. This provides a more twist-resistant orientation than the outlet tube 83''. The downward force generated by the incoming fluid causes the bending of the outlet tube, which is already pointing downward. This reduces the strain on the outlet tube 8 and reduces the likelihood of kinks forming. 3'' must generally bend downward from the cassette 5'' to reach the patient. Since the cassette does not have a flow path, having an outlet tube already extending downward from the cassette allows for The tube can be positioned to better reach the patient without being twisted by the body weight. The beam is directed at it.

[0065] In one non-exclusive description of the present invention, a cassette for use with a pumping device is provided. The cassette is generally removed from the pumping system to allow it to be attached to the pumping system. The body has a front, rear, upper, lower, and and a curved guide wall extending downward from the top of the body. The cassette has an inlet port for attaching the inlet tubing to the cassette and an outlet port for attaching the outlet tubing to the cassette. and an outlet port for attachment to a set. The outlet port is recessed from the top of the body. The curved guide wall supports the outlet tube to prevent it from twisting. The fitting extends adjacent to the outlet port.

[0066] When introducing elements of the present invention or preferred embodiments thereof, the articles "a," "an," "t" and "t" are used. The words "he" and "said" are intended to mean that one or more of an element is present. The terms "comprise," "include," and "have" are intended to be inclusive. means that there may be additional elements other than the listed elements.

[0067] In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained. You will understand that.

[0068] Various modifications may be made to the above structure without departing from the scope of the present invention. All matter contained in the above description or shown in the accompanying drawings is intended to be illustrative and not restrictive. No limiting sense is intended.

Claims

1. 1. A pump set for use with a pumping apparatus, comprising: a tube for conveying a liquid, the tube having an inlet section for connection to a liquid source; the pumping device is configured to engage the tube to pump the liquid through the tube. a tube having a pump-engaging section; attached to the tube between the inlet section and the pump engagement section a valve mechanism connected to an inlet section of the tube; a first port, a second port connected to a pump-engaging section of the tubing; a valve disposed between the first port and the second port, the valve a rotatable stem for selectively placing a port in communication with the second port, the stem includes a flow channel extending through the stem from an inlet end of the flow channel to an outlet end of the flow channel, thereby and connecting the inlet section of the tube with the pump-engaging section of the tube. To this end, the inlet end of the flow path communicates with the first port, and the outlet end of the flow path communicates with the second port. the flow passage is in communication with the valve, the cross-sectional area of ​​the flow passage increasing from the inlet end to the outlet end. mechanism and A pump set comprising:

2. The cross-sectional area of ​​the flow passage varies at different rates throughout the flow passage from the inlet end to the outlet end. The pump set according to claim 1 .

3. the maximum rate of increase in the cross-sectional area of ​​the flow channel occurs approximately midway between the inlet end and the outlet end of the flow channel; 3. The pump set according to claim 2.

4. The flow path includes a first section extending from the inlet end toward the outlet end, 3. The pump set of claim 2, wherein the first section diverges as it extends from the inlet end. to.

5. The flow path includes a second section extending from the first section toward the outlet end. and the second section extends from the first section toward the outlet end.

5. The pump set of claim 4, wherein the first section expands at a different rate than the second section.

6. The flow path includes a third section extending from the second section toward the outlet end. and the third section extends from the second section toward the outlet end.

6. The pump set of claim 5, wherein the first section expands at a different rate than the second section.

7. The flow path includes a fourth section extending from the third section to the outlet end, The fourth section extends from the third section to the outlet end.

7. The pump set of claim 6, wherein the pump section expands at a different rate than the pump section.

8. The tube has a first inlet element for connecting to a first liquid source and a second inlet element for connecting to a second liquid source. and a second inlet element for connecting the first port to the first inlet element of the tube. the valve mechanism includes a third port connected to a second inlet element of the tube; The stem selectively connects the outlet end of the flow path to the first port and the third port. the outlet end of the flow passage is rotatably mounted such that the inlet end is in front of the first port.

2. The method of claim 1, wherein the second port remains in communication with the third port when the second port rotates between the first port and the second port. Pump set as described.

9. The first port, the second port, the third port, and the flow passage are generally on the same plane.

9. The pump set according to claim 8.

10. a cassette configured to be removably attached to the pumping device; wherein the tubing and the valve mechanism are removably attached to the cassette.

2. The pump set of claim 1.

11. The first port has a non-uniform circular shape for communicating fluid to a flow path within the valve stem. The pump set of claim 1 having an opening.

12. Fitting for use in a cassette configured to be attached to a pumping device 1. A gasket assembly comprising: A first port; A second port; a valve disposed between the first port and the second port, the valve comprising: a rotatably mounted switch for selectively communicating said first port with said second port; a stem extending through the stem from an inlet end of the flow channel to an outlet end of the flow channel; a flow path through which the inlet section of the tube is connected to the pump engagement of the tube; an inlet end of the flow passage communicates with the first port to communicate with the section; The outlet end of the second port communicates with the second port, and the flow path extends from the inlet end to the outlet end. The cross-sectional area increases, and the valve A fitting assembly comprising:

13. The cross-sectional area of ​​the flow passage varies at different rates throughout the flow passage from the inlet end to the outlet end. The fitting assembly of claim 12 .

14. the maximum rate of increase in the cross-sectional area of ​​the flow channel occurs approximately midway between the inlet end and the outlet end of the flow channel; 14. The pump set of claim 13.

15. The first port has a non-uniform circular shape for communicating fluid to a flow path within the valve stem. The fitting assembly of claim 14 having an opening.

16. 1. A cassette for use with a pumping device, comprising: The cassette is removed from the pumping device for installation in the pumping device. a body configured to be operably attached to the a fitting removably attachable to the body, The hose includes a first port, a second port, and a hose disposed between the first port and the second port. and a valve connected to the first port, a stem rotatably mounted for selective communication with said The fitting is rotated when the stem is rotated to connect the first port to the second port. a catch on the pumping device to secure the pumping device to the pumping device; a fitting including a flange configured to A cassette comprising:

17. The valve includes a stem holder for mounting the stem, and the stem holder the flange engages to limit rotation of the stem within the stem holder.

17. The cassette of claim 16, defining a stop disposed as follows:

18. The stem holder is configured to hold the cap when the main body is attached to the pumping device.

20. The cassette of claim 17, having a recess configured to receive a latch.

19. 17. The cassette of claim 16, wherein the flange projects radially outward from the stem. to.

20. the flange has a generally sectorial shape extending radially around the stem. Item 20. The cassette according to Item 19.

21. 1. A pump set for use with a pumping apparatus, comprising: a tube for conveying a liquid, the tube having an inlet section for connection to a liquid source; a pump configured to engage a pumping device to pump liquid through the tube; a tube having a cap engaging section; a valve attached to the tube between the inlet section and the pump engagement section; a valve mechanism, the valve mechanism comprising a first valve connected to an inlet section of the tube; a valve member, the first port including a first port member and a second port member; The pump mechanism includes a second port connected to the pump-engaging section of the tube and a second port connected to the first port. and a valve disposed between the first port and the second port, a rotatable stem selectively connecting one port to the second port, the stem comprising: a flow channel extending through the stem from an inlet end of the flow channel to an outlet end of the flow channel, thereby to communicate an inlet section of the tube with a pump-engaging section of the tube; The inlet end of the flow channel communicates with the first port, and the outlet end of the flow channel communicates with the second port. When the inlet end of the flow passage communicates with the first port member, the outlet end of the flow passage communicates with the second port member. and when said outlet end is in communication with the second port member, said outlet end is in communication with the second port member. a valve mechanism sized and shaped to communicate with two ports; A pump set comprising:

Images