US20140271246A1 - Cooperation of platen and pump cassette for pump device - Google Patents

Abstract

A pumping mechanism includes a housing containing the pumping mechanism, the housing defining a seat configured to receive a pump cassette having a fluid lumen that can be acted upon by the pumping mechanism so as to pump fluid through the fluid lumen of the pump cassette. A platen pad is movably attached to the housing mechanism, wherein the platen pad can movably adjust in position relative to the pump cassette as the pump cassette is secured in the seat of the housing.

Description

BACKGROUND
• Infusion pump and sensing device systems are widely used in the medical field for infusing a fluid, such as a medication, to a patient in the environment of intensive care units, cardiac care units, operating rooms or trauma centers. Several types of infusion pump systems permit the infusion of several medications using pumps that are modularly coupled to one another, as it may often be necessary to simultaneously infuse into the patient several different kinds of fluids. Some of the several types of fluids, such as drugs, may not be directly compatible with each other and therefore need to be infused into the patient at different points of the body or at different times.
• In this regard, there exist modular systems in which pump and monitoring modules can be selectively attached, both physically and electrically, to a central management unit. The central management unit controls the operation of pump modules attached to it, and receives and displays information regarding the pump modules. Each module may include a modular pump that is configured to be removably coupled to a corresponding pump cassette that enables the pumping of fluid. The pump cassette may include a platen portion that is positioned relative to a pump segment of a fluid lumen so act as a platen for pumping of fluid through the fluid lumen. It can be important for the platen portion to be properly positioned relative to the fluid lumen to achieve proper pumping of fluid.
• In view of the foregoing, there is a need for infusion pump systems that facilitate the proper positioning and alignment of a pump platen relative to a fluid lumen through which fluid is pumped.
SUMMARY
• Disclosed is a pump device, comprising: a pumping mechanism; a housing containing the pumping mechanism, the housing defining a seat configured to receive a pump cassette having a fluid lumen that can be acted upon by the pumping mechanism so as to pump fluid through the fluid lumen of the pump cassette; and a platen pad movably attached to the housing mechanism, wherein the platen pad can movably adjust in position relative to the pump cassette as the pump cassette is secured in the seat of the housing.
• Further disclosed is a method of coupling a pump cassette with a pump device, comprising: inserting the pump cassette into a seat of the pump device; and closing a door of the pump device to secure the pump cassette in the seat, wherein the door includes a platen pad that adjusts in position relative to the pump as the door is closed.
• The details of one or more variations of the subject matter described herein are set forth in the accompanying drawings and the description below. Other features and advantages of the subject matter described herein will be apparent from the description and drawings, and from the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
• FIG. 1 shows a schematic view an infusion system configured for pumping a fluid to a patient.
• FIGS. 2 and 3 shows perspective views of an exemplary pump cassette for use with the system ofFIG. 1.
• FIGS. 4 and 5 show top and bottom plan views, respectively, of the pump cassette.
• FIG. 6 shows an enlarged view of a valve assembly of the pump cassette.
• FIG. 7 shows a front view of the pump cassette mounted in a seat of a modular pump device.
• FIG. 8 shows the modular pump device with a door in a closed state.
• FIG. 9 shows an enlarged view of an inner portion of the door of the modular pump device.
• FIG. 10 shows a platen region of the door of the modular pump assembly.
• Like reference symbols in the various drawings indicate like elements.
DETAILED DESCRIPTION
• Disclosed is a medical fluid infusion system configured for pumping a fluid to a patient, such as in a hospital environment. The system includes one or more modular pump devices each of which is configured to be removably coupled to a pump cassette. When coupled to one another, the modular pump device and pump cassette can collectively pump a fluid to a patient. The pump cassette is configured to be coupled to the modular pump device such as by inserting the pump cassette into a seat of the pump device.
• The pump cassette forms a platen that is coupled mounted to a door of the modular pump device. The door includes a pad that can translate and rotate relative to the pump cassette as the door is closed. This permits the door to automatically adjust in position relative to the pump cassette as the door is closed so that the platen of the pump cassette automatically achieves a proper position relative to a fluid lumen of the pump cassette.
• FIG. 1 shows a schematic representation of aninfusion system100 configured to be used in pumping a fluid to a patient. Theinfusion system100 includes a fluid container, such as an intravenous (IV)bag105, fluidly coupled to apump cassette110 via a fluid conduit, such as atube115. Thepump cassette110 is configured to pump fluid from the IVbag105 toward a patient via atube120 when thepump cassette110 is coupled to amodular pump device112. Thepump cassette110 is configured to be removably coupled to themodular pump device112 such as by inserting thepump cassette112 into a seat of themodular pump device112. The following U.S. patent application describes an exemplary pump system and is incorporated by reference herein in its entirety: U.S. patent application Ser. No. ______ entitled “Modular Medical Device System” (attorney docket no. 45004-038F01US), filed concurrently herewith.
• With reference still toFIG. 1, thetube115 has a proximal end fluidly coupled to (such as via a drip chamber) the IVbag105, and a distal end fluidly coupled to afluid lumen205 of thepump cassette110. Likewise, thetube120 has a proximal end fluidly coupled to a fluid lumen of thepump cassette110 and a distal end that attaches to the patient via an IV connection. Either of thetubes105 or100 may be formed of a single tube or may be formed of a series of tubes removably attached to one another, such as in an end-to-end manner using any of a variety of connectors such as Luer connectors. Thetubes115 and120 and the fluid lumen205 (FIG. 2) of thepump cassette110 collectively form a continuous fluid lumen that provides a fluid pathway from the IVbag105 toward the patient. The combinations of components115 (with drip chamber),110 and120 (with luer fitting) comprise what is termed an “IV set”, which can include additional components along the continuous fluid lumen. This continuous fluid lumen may include any of a variety of components that facilitate or otherwise are used in connecting the tubes and/or pumping fluid, including, for example, valves, filters, free-flow stop valves, pressure and air detection regions or components and access connectors, etc. Any of a variety of additional components may be used, including, for example, anti-free flow devices, pressure sensing components, air detection components, etc.
• FIGS. 2 and 3 shows perspective views of anexemplary pump cassette110.FIGS. 4 and 5 show top and bottom plan views, respectively, of thepump cassette110. As mentioned, thepump cassette110 may be in the form of a cassette assembly that removably inserts into a modular pump device. With reference to FIG.2, thepump cassette110 includes afluid lumen205. When thepump cassette110 is attached to thetubes115 and120, thefluid lumen205 fluidly connects thetube115 to thetube120. Thefluid lumen205 may be acted upon by any of a variety of pump mechanisms of the modular pump device to pump fluid through thefluid lumen205 in order to achieve fluid flow from the IVbag105 to or toward the patient.
• As mentioned, thepump cassette110 may be particularly adapted for coupling only to a particular type of modular pump device. For example, the pump cassette may be adapted to be coupled only to a modular pump device having a particular type of pumping mechanism (such as a peristaltic pump) or to a pump that pumps a particular type of fluid, such as a particular type of drug.
• For such circumstances, an identifier may be associated with the pump cassette wherein the identifier matches with a corresponding or complementary identifier on the particular modular pump device to which the pump cassette matches. The identifier may be any type of identifier that uniquely identifies the pump cassette and that can be associated with a corresponding identifier on the modular pump device. For example, the identifier may be a color code on the pump cassette that is identical to or otherwise matches with a corresponding color code on the modular pump device. Any type of identifier may be used, such as, for example, a symbol, sound, or color. The identifier may be used to, for example, to facilitate quick and accurate installation of the pump cassette into the device.
• Any of a variety of structures may be used to form thefluid lumen205 of thepump cassette110. For example, with reference toFIGS. 2 and 5, thefluid lumen205 may be formed of a tubular structure that defines thefluid lumen205. The tubular structure may be formed of any of a variety of materials, including for example polysiloxane (e.g., “silicone rubber”), plasticized Polyvinyl chloride (PVC), silicone, thermoplastic elastomers, elastomeric plastics, butyl rubber, or other materials. Any of a variety of connectors and/or valves may be used to attach thefluid lumen205 to thetubes115 and120.
• Thefluid lumen205 has a cross-sectional shape along a plane generally normal to the direction of fluid flow through which fluid can flow. The cross-sectional shape may vary along the interior or exterior of the fluid lumen. For example, the cross-sectional shape may be circular. Or, the cross-sectional shape may be a non-circular shape that facilitates compression of the outer walls of the fluid lumen when a pump mechanism is acting on the fluid lumen. The pump mechanism may achieve pumping through thefluid lumen205 such as by compressing and/or deforming one or more portions of the fluid lumen to achieve fluid flow through the lumen. The non-circular cross-sectional shape may be, for example, a generally flattened shape, such as oval shape, eye, or diamond shape, that facilitates further flattening of the fluid lumen when a pump mechanism acts on the fluid lumen.
• A proximal end of the fluid lumen tubular structure is fluidly and/or mechanically attached to thetube115, such as via avalve assembly210. A distal end of the fluid lumen tubular structure is attached to thetube120, such as via aconnector220. Thefluid lumen205 may also be formed of two or more structures that collectively define thefluid lumen205 therebetween.
• With reference still toFIGS. 2-5, thefluid lumen205 is positioned on aframe225. Theframe225 is formed of a relatively hard or rigid material such that the frame may act as aplaten227 relative to thefluid lumen205 for pumping fluid through thefluid lumen205. Theplaten227 may be flat or curved to cooperate in the reduction of forces required to ensure adequacy of occlusion of the moving occluding elements (such as fingers) of a pump mechanism. That is, theplaten227 may be shaped so as to cooperate with or form the non-circular cross-section of thefluid lumen205 discussed above.
• In addition, the relatively rigid structure of theframe225 can be used to secure thefluid lumen205 in a fixed position and/or shape relative to theframe225, such as to eliminate or reduce the risk of thefluid lumen205 being unintentionally stretched or moved during positioning of theframe225 into the modular pump device.
• As best shown inFIGS. 2 and 5, one or more attachment members, such as clips230, are configured to secure thefluid lumen205 to theframe225. In the illustrated version, twoclips230aand230bare positioned over thefluid lumen205 and attached to theframe225 such that the clips230 secure thefluid lumen205 to theframe225. Thefirst clip230ais located near one end of thefluid lumen205 and thesecond clip230bis located near an opposite end of thefluid lumen205. It should be appreciated, however, that various quantities of clips may be used at any of a variety of locations along thefluid lumen205 and/or theframe225.
• With reference again toFIGS. 2-5, thepump cassette110 may be configured so that it can only be inserted into the modular pump device when aligned in a predetermined manner relative to the modular pump device. This eliminates or reduces the likelihood that thepump cassette110 will be inserted in an incorrect or improper orientation into the modular pump device. In this regard, thepump cassette110 may be shaped so that it can only be inserted into the modular pump device when positioned in a predetermined orientation relative to the modular pump device. For example, theframe225 can have an asymmetric shape that fits into a complementary-shaped seat in the modular pump device housing. Or theframe225 can have one or more prongs or protrusions that must be aligned with complementary-shaped seats in the modular pump device in order for theframe225 to be inserted into the modular pump device.
• In the version ofFIGS. 2-5, theframe225 has shape that is asymmetric about a vertical axis. Theframe225 has a head region that is rounded and enlarged relative to a relatively thinner elongated body region. This provides theframe225 with a key-like shape that can only be inserted into a complementary-shaped seat in the modular pump device housing when theframe225 and the modular pump device housing are properly aligned. Any of a variety of asymmetric shapes can be used. The manner in which theframe225 inserts into the seat of the modular pump is described in more detail below with reference toFIGS. 7-10.
• As mentioned, thepump cassette110 includes avalve assembly210. Thevalve assembly210 includes a valve coupled to thefluid lumen205 for controlling fluid flow through thefluid lumen205. The valve can function in a variety of manners relative to the fluid lumen. For example, the valve can function as a flow stop in that it has an “on” (flow) state that permits flow through thefluid lumen205 and an “off” (no flow) state that stops or blocks flow through thefluid lumen205. Or, the valve can function as flow regulator that permits various levels of flow rate through thefluid lumen205 based upon various, corresponding states of the valve.
• In the version shown inFIGS. 2-5, thevalve assembly210 comprises a rotary valve that transitions between an off state and an on state. Thevalve assembly210 is located at the head region of theframe225 where thetube115 attaches to thefluid lumen205, although the position of thevalve assembly210 may vary. Thevalve assembly210 includes avalve handle250 that is functionally coupled to abody255 so as to collectively form a rotary valve, as best shown inFIGS. 2 and 5. The valve handle250 can be actuated to open and close thevalve assembly210. For example, the valve handle250 can rotate between an open and a closed position. When valve handle250 is in the open position, the valve is open to permit fluid flow through thefluid lumen205. Likewise, when thevalve handle250 is in the closed position, the valve is closed to stop or block fluid flow through thefluid lumen205.
• Thevalve assembly210 may also functional as a “dial-a-flow.” That is, thevalve assembly210 is able to be utilized to control the flow rate (e.g., mL/hr). For example, the valve handle250 may have markings that indicate flow rates. A user may actuate the valve handle250 (e.g., manually or automatically) and indicate the desired flow rate based on the markings/indications onvalve handle250. Thevalve assembly210 may be shipped to a customer in a closed or open position based on the customer's desires.
• FIG. 6 shows an enlarged view of thevalve assembly210 and the attachedfluid lumen205. For clarity of illustration, the remaining components of thepump cassette110 are not shown inFIG. 6. Thevalve handle250 and thebody255 collectively form a rotary valve, although the type of valve may vary. Thebody255 is fluidly attached to thefluid lumen205. Thehandle250 has portion that extends into thebody255 such that thehandle250 can be rotated relative to the body to a variety of positions. Depending on the position of the valve handle250 relative to thebody255, fluid flow from thebody255 into thefluid lumen205 can be opened or blocked. Thus, the valve handle250 can be actuated via rotation so as to open or close the valve assembly.
• Due to the use of a rotary valve, fluid flow is able to be consistent because it is difficult to unintentionally actuate the rotary valve during use. In contrast, during use, tubing wants to relax to its original form. As such, pinch clamps or roller clamps are unintentionally urged to open up which may unintentionally change flow rate.
• Thevalve assembly210 may be configured to be actuated to an open position when a pumping mechanism (e.g., pumping fingers) occludes the fluid lumen. For example, the pump cassette may be properly seated in the modular pump device but thevalve assembly210 is not allowed to open because the pumping mechanism is not occluding the fluid lumen. However, once the pumping segment is occluded, thevalve assembly210 is allowed to be actuated into an open position.
• With reference toFIGS. 3 and 6, the valve handle250 may have a disk-like shape in that thevalve handle250 is relatively round and planar or substantially flat. In the illustrated version, thevalve handle250 is circular with an undulating circumference that forms a series of knobs. One or more coupling elements, such asslots305, are located on thevalve handle250. As described more fully below, theslots305 are configured to mate with complementary coupling elements, such as tabs, of the modular pump device. When properly coupled to the modular pump device, the act of coupling (or a portion thereof) causes the modular pump device to automatically transition the valve handle250 to an open position that opens the valve body so as to permit fluid flow through thefluid lumen205.
• FIG. 7 shows a front view of thepump cassette110 mounted in aseat700 of amodular pump device705. Theseat700 has a shape that is configured to snugly receive thepump cassette110. The seat may have one or more features, such as tabs or prongs, configured to yield when thepump cassette110 is pushed into theseat700 and then snap into place to secure thepump cassette700 within theseat700 once thepump cassette110 is mounted therein. A feedback, such as a tactile, audio, or visual feedback, may be provided when thepump cassette110 is securely mounted in theseat700. For example, a snapping sound may occur when thepump cassette110 is securely mounted in the seat.
• With reference still toFIG. 7, themodular pump device705 is formed of anouter housing710 having afront panel715 on which a user interface or display panel may be positioned. Thehousing710 defines an internal cavity in which is mounted a pump mechanism that is configured to act on the fluid lumen205 (FIG. 2) of thepump cassette110 for pumping fluid through thefluid lumen205. Any type of pump mechanism may be used, including a peristaltic pump mechanism.
• In the example shown inFIG. 7, theseat700 is positioned adjacent thefront panel715 although the relative positions may vary. Themodular pump device705 includes an access element, such as anaccess door720. Theaccess door720 can be opened to access and expose a seat where thepump cassette110 can be inserted into the pump. Theaccess door720 is movably attached to thehousing710 such as via a hinge assembly that permits thedoor720 to transition between an open state (as shown inFIG. 7) and a closed state (as shown inFIG. 8.)
• With reference toFIG. 10, amovable platen pad1005 is disposed on an inner region of thedoor720. Theplaten pad1005 is a movable, rigid structure that protrudes from the inner region of thedoor720. In the illustrated version, theplaten pad1005 is a substantially elongated body with straight sides and rounded ends. Theplaten pad1005 defines a flat or substantiallyflat surface1010 that is juxtaposed or spaced from thepump cassette110 when thepump cassette110 is seated in themodular pump device705 and the door is closed. Thesurface1010 provides a hard surface against which thepump cassette110 is positioned when the door is closed. In this manner, theplaten pad1005 secures the pump cassette and its platen in place relative to the pump mechanism of the pump device. The pump mechanism may be, for example, a plurality of fingers that progressively compress thefluid lumen205 in sequence and thereby pump fluid throughfluid lumen205.
• Theplaten pad1005 is disposed on or in thedoor720 such that theplaten pad1005 may move relative to the door and relative to thepump cassette110 seated in thepump device705. That is, theplaten pad1005 is movably disposed in thedoor720 such that theplaten pad1005 may move along an axis parallel and/or normal to thesurface1010 and may also rotate relative to the door. This permits theplaten pad1005 to “give” as a force is exerted onto the platen pad, such as onto thesurface1010. This permissible movement of theplaten pad1005 enables theplaten pad1005 to self-adjust in position relative to thepump cassette110 as thedoor720 so as to achieve an optimal position relative to thepump cassette110. In this manner, theplaten pad1005 is essentially pliable so that it automatically achieves proper positioning relative to thepump cassette110 as the door of the pump device is closed.
• One or more biasing members, such as springs, may be disposed within thedoor720 and coupled to theplaten pad1005 to bias the platen pad toward a certain position. The spring may vary and may be, for example, a non-linear spring. That is, the spring may be “soft” as thedoor720 is initially closing. However, as thedoor720 is fully seated and locked, the compression force of the spring may increase in order to provide sufficient force for proper seating of theplaten pad1005 relative to thepump cassette110.
• As best shown inFIG. 8, an actuator, such asknob805, is coupled to thedoor720. Theknob805 can be actuated by a user to lock thedoor720 once the door is closed with thepump cassette110 mounted in theseat700 of themodular pump device705. Actuation of theknob805 to the locked state actuates a lock assembly, such as via a pair oflatches915 that latch with or otherwise engage thehousing710 to secure the door in the closed state. In the illustrated version, theknob805 can be actuated via rotation. It should be appreciated that mechanisms other than knobs can be used as well as non-rotational actuation.
• As will be described in more detail below, the actuation of theknob805 to the locked state also automatically transitions the valve assembly of thepump cassette110 to the “on” state to permit fluid flow through thepump cassette110. In addition, actuation of theknob805 to the unlocked state automatically transitions the valve assembly of thepump cassette110, when mounted in themodular pump device705, to the “off” state. This acts as a safeguard to ensure that the valve of the pump cassette is always closed upon removal of the pump cassette from the modular pump device and that the valve opens automatically upon being seated and secured (with thedoor720 closed) in themodular pump device700.
• The operation of theknob805 and its interaction with thepump cassette110 is now described in more detail with reference toFIG. 9, which shows an enlarged view of an inner region of thedoor720 where theknob805 is located. As mentioned, the inner portion of the door includes a pair of protrusions, such astabs905. Thetabs905 protrude toward thepump cassette110 when the pump cassette is mounted in theseat700 of themodular pump device700. Thetabs905 may move inward and outward relative to thedoor720. Thetabs905 may be spring-mounted such that they are biased toward the protruded state shown inFIG. 9. In addition, thetabs905 are positioned such that they can be aligned with and inserted into the slots305 (FIG. 3) of the valve handle250 when thepump cassette110 is seated in the modular pump device and thedoor720 closed. Rotation of the knob805 (FIG. 8) results in corresponding rotation of thetabs905. In this manner, thetabs905 can be rotated to a position that align with and insert into theslots305 of thevalve handle250.
• For example,FIG. 7 shows the pump cassette with both theslots305 and thetabs905 positioned at a “12 o'clock and 6 o'clock” alignment. If thedoor720 is closed, thetabs905 will insert into and engage theslots305 of thevalve handle250. Thedoor720 can then be manually or automatically closed such that the prongs insert into the slots of thevalve handle250. In this manner, thedoor720 of the modular pump device physically engages the valve handle250 via thetabs905. Upon closing of the door, theknob805 can be rotated to a locked position. Because theknob805 is engaged with the valve handle250 via thetabs905, locking of theknob805 rotates and actuates the valve handle250 to the open position to permit fluid flow through the fluid lumen of the valve set. Upon unlocking of theknob805, the knob automatically rotates the valve handle250 back to the closed position.
• Thetabs905 andslots305 do not have to be initially aligned when the pump cassette is positioned in theseat700 of themodular pump device705. Rather, the valve handle250 may be in any position (open, closed, or between the two) and thetabs905 will automatically engage the valve handle250 upon rotation of theknob805. If not aligned, when thedoor720 is closed thetabs905 will just be pushed inward of the door. When theknob805 is rotated, thetabs905 will eventually align with theslots305 and spring into the slots by virtue of their spring loading. In this manner, the locking of thedoor720 will automatically transition the valve assembly to the on position. Likewise, unlocking of the door automatically transition the valve assembly to the off position.
• One or more aspects or features of the subject matter described herein may be realized in digital electronic circuitry, integrated circuitry, specially designed ASICs (application specific integrated circuits), computer hardware, firmware, software, and/or combinations thereof. These various implementations may include implementation in one or more computer programs that are executable and/or interpretable on a programmable system including at least one programmable processor, which may be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device (e.g., mouse, touch screen, etc.), and at least one output device.
• These computer programs, which can also be referred to as programs, software, software applications, applications, components, or code, include machine instructions for a programmable processor, and can be implemented in a high-level procedural and/or object-oriented programming language, and/or in assembly/machine language. As used herein, the term “machine-readable medium” refers to any computer program product, apparatus and/or device, such as for example magnetic discs, optical disks, memory, and Programmable Logic Devices (PLDs), used to provide machine instructions and/or data to a programmable processor, including a machine-readable medium that receives machine instructions as a machine-readable signal. The term “machine-readable signal” refers to any signal used to provide machine instructions and/or data to a programmable processor. The machine-readable medium can store such machine instructions non-transitorily, such as for example as would a non-transient solid state memory or a magnetic hard drive or any equivalent storage medium. The machine-readable medium can alternatively or additionally store such machine instructions in a transient manner, such as for example as would a processor cache or other random access memory associated with one or more physical processor cores.
• To provide for interaction with a user, the subject matter described herein can be implemented on a computer having a display device, such as for example a cathode ray tube (CRT) or a liquid crystal display (LCD) monitor for displaying information to the user and a keyboard and a pointing device, such as for example a mouse or a trackball, by which the user may provide input to the computer. Other kinds of devices can be used to provide for interaction with a user as well. For example, feedback provided to the user can be any form of sensory feedback, such as for example visual feedback, auditory feedback, or tactile feedback; and input from the user may be received in any form, including, but not limited to, acoustic, speech, or tactile input. Other possible input devices include, but are not limited to, touch screens or other touch-sensitive devices such as single or multi-point resistive or capacitive trackpads, voice recognition hardware and software, optical scanners, optical pointers, digital image capture devices and associated interpretation software, and the like.
• The subject matter described herein can be embodied in systems, apparatus, methods, and/or articles depending on the desired configuration. The implementations set forth in the foregoing description do not represent all implementations consistent with the subject matter described herein. Instead, they are merely some examples consistent with aspects related to the described subject matter. Although a few variations have been described in detail above, other modifications or additions are possible. In particular, further features and/or variations can be provided in addition to those set forth herein. For example, the implementations described above can be directed to various combinations and subcombinations of the disclosed features and/or combinations and subcombinations of several further features disclosed above. In addition, the logic flow(s) when depicted in the accompanying figures and/or described herein do not necessarily require the particular order shown, or sequential order, to achieve desirable results. Other implementations may be within the scope of the following claims.

Claims (17)

1. A pump device, comprising:

a pumping mechanism;

a housing containing the pumping mechanism, the housing defining a seat configured to receive a pump cassette having a fluid lumen that can be acted upon by the pumping mechanism so as to pump fluid through the fluid lumen of the pump cassette;

a platen pad movably attached to the housing mechanism, wherein the platen pad can movably adjust in position relative to the pump cassette as the pump cassette is secured in the seat of the housing.

2. A pump device as inclaim 1, further comprising a door movably attached to the housing, wherein the platen pad is movably mounted in the door.

3. A pump device as inclaim 2, wherein the door is rotatably attached to the housing.

4. A pump device as inclaim 2, wherein the platen pad is spring-mounted in the door.

5. A pump device as inclaim 1, wherein the pump cassette defines a platen.

6. A pump device as inclaim 1, wherein the pumping mechanism is a peristaltic pumping mechanism.

7. A pump device as inclaim 1, further comprising:

the pump cassette for coupling with the pump device, the pump cassette comprising: a fluid lumen adapted for passage of an infusion fluid toward a patient; a valve assembly that can be actuated to regulate fluid flow through the fluid lumen; and a frame coupled to the fluid lumen and the valve assembly, the frame adapted to be inserted into a seat of a pump device.

8. A pump device as inclaim 2, wherein the door transitions between an open position wherein the seat is exposed for receipt of the pump cassette and a closed position wherein the door secures the pump cassette within the seat.

9. A pump device as inclaim 8, further comprising a door actuator configured to transitioned to a locked state that locks the door in the closed position, wherein the door actuator is configured to automatically transition a valve assembly of the pump cassette to the open state when the door actuator is transitioned to the locked state.

10. A pump device as inclaim 9, wherein the door actuator automatically transitions the valve assembly to the off state when the door actuator is transitioned to the unlocked state.

11. A device as inclaim 7, wherein the pump cassette can only be inserted into the seat when the pump cassette is aligned in a predetermined orientation relative to the seat.

12. A method of coupling a pump cassette with a pump device, comprising:

inserting the pump cassette into a seat of the pump device;

closing a door of the pump device to secure the pump cassette in the seat, wherein the door includes a platen pad that adjusts in position relative to the pump as the door is closed.

13. A method as inclaim 12, further comprising locking the door, wherein locking the door automatically causes a valve of the pump cassette to open.

14. A method as inclaim 12, further comprising unlocking the door, wherein locking the door automatically causes a valve of the pump cassette to close.

15. A method as inclaim 12, further comprising activating a pump mechanism of the pump device such that the pump mechanism cooperates with the pump cassette and the platen pad to pump fluid through the pump device.

16. A method as inclaim 12, wherein closing the door comprises rotating the door from an open position to a closed position.

17. A method as inclaim 12, wherein the pump cassette comprises a fluid lumen adapted for passage of an infusion fluid toward a patient; a valve assembly that can be actuated to regulate fluid flow through the fluid lumen; and a frame coupled to the fluid lumen and the valve assembly, the frame adapted to be inserted into a seat of a pump device.

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