Dual Sensor Differential Pressure Transducer System

Abstract

The dual differential pressure transducer assembly includes a flow path element that defines a fluid channel from an intravenous (IV) fluid inlet to an IV fluid outlet and defines a centerline axis of the assembly. A first sensor cavity and a second sensor cavity are disposed in parallel alongside the fluid channel and are separately connected to the fluid channel via first and second notches through the flow path element across the centerline axis. A first differential pressure sensor and a second differential pressure sensor abut their respective cavities and are exposed to the fluid channel through the notches. Separate signal conductors are electrically connected to the first differential pressure sensor and the second differential pressure sensor and are housed within a common connector cable.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of U.S. Patent Application No. 63 / 476,363, filed December 20, 2022, and entitled "DUAL-SENSOR DIFFERENTIAL PRESSURE TRANSDUCER SYSTEM." The disclosure of U.S. Patent Application No. 63 / 476,363 is incorporated herein by reference in its entirety.

[0002] The present disclosure relates generally to devices for intravenous (IV) fluid delivery. More particularly, the present disclosure relates to a differential pressure transducer (DPT) system used to monitor fluid pressure in an IV fluid delivery system. [Background technology]

[0003] The DPT system is typically included between the IV bag and needle to sense fluid flow rate and is communicatively coupled to a patient monitor and other electronic devices to, for example, regulate and generate a record of fluid delivery and trigger dose warnings. Fluid flows through the DPT system, which provides an electrical signal reflective of the differential pressure to an attached patient monitor via an electrical connection.

[0004] DPT systems for IV fluid monitoring are sterile elements that are typically placed near the patient along the IV line or, in some cases, secured to the patient, e.g., taped to the patient's arm. When a patient is transported from one location (e.g., an ambulance) to another (e.g., a hospital), the DPT system remains attached to the patient but may be fluidly connected to multiple IV bags, each providing a signal output used by multiple different patient monitoring devices or systems in different environments. To ensure proper hygiene, DPT systems are typically not reused. For these reasons, DPT systems are typically disposable devices configured to connect to and provide sensor signals to a wide variety of electronic systems for patient monitoring. Summary of the Invention [Means for solving the problem]

[0005] In one exemplary embodiment, the present disclosure provides a dual differential pressure transducer assembly, the dual differential pressure transducer assembly including a flow path element forming a fluid channel from an intravenous (IV) fluid inlet to an IV fluid outlet and defining a centerline axis of the assembly. A first sensor cavity and a second sensor cavity are disposed alongside the fluid channel and are separately connected to the fluid channel via first and second notches through the flow path element across the centerline axis. A first differential pressure sensor and a second differential pressure sensor abut the respective cavities and are exposed to the fluid channel through the notches. Separate signal conductors are electrically connected to the first differential pressure sensor and the second differential pressure sensor and are housed within a common connector cable.

[0006] In another exemplary embodiment, the present disclosure provides a differential pressure transducer assembly including a fluid channel for IV fluid, first and second differential pressure sensors disposed to generate respective signals indicative of fluid flow through the fluid channel, and first and second multiple signal conductors electrically connected to the first and second differential pressure sensors, respectively. The conductors are carried within a common connector cable to a connector plug having separate multiple pins that contact the first and second signal conductors. A wire guide separates the first and second multiple signal conductors and guides each signal conductor to its respective pin.

[0007] In yet another exemplary embodiment, the present disclosure provides a sensor signal connector configured to separately transmit sensor signals from a first sensor to a second sensor. The sensor signal connector includes separate first and second signal conductors electrically connected to the first and second sensors, respectively. A common connector cable surrounds both signal conductors, and a wire guide having opposing first and second sides is disposed at the end of the connector cable. The wire guide holds exposed ends of the first and second signal conductors in a connecting position on the first end and holds exposed ends of the second signal conductors on the second end. A plurality of pins are each attached to one of the first or second signal conductors and secured within the wire guide. A modular plug defines an outer form factor of the sensor signal connector securable within the sensor receptacle and surrounds the wire guide, thereby securing the first and second signal conductors to the wire guide and exposing the pins.

[0008] In yet another exemplary embodiment, the present disclosure provides a multifunction signal connector configured to receive both analog and digital sensor signals. The multifunction signal connector includes an oval-shaped socket disposed about a receptacle axis and defining a receptacle space, and a rigid contact support disposed within the oval-shaped socket. The rigid contact support includes a top shelf and a bottom shelf. A first plurality of electrical contacts are disposed between the top shelf and the oval-shaped socket and angled from the top shelf toward the bottom shelf, while a second plurality of electrical contacts are disposed between the bottom shelf and the oval-shaped socket and angled from the bottom shelf toward the top shelf.

[0009] In yet another exemplary embodiment, the present disclosure provides a snap-fit ​​connection between a flow path element and a structural housing of a DPT assembly. The snap-fit ​​connection includes a plurality of protrusions extending from the flow path element or the structural housing. The protrusions are inserted into receptacles on an adjacent component. The protrusion geometry, such as the length, width, and thickness of the protrusions, and optionally, reinforcing ribs, allow for adjustment of insertion and extraction forces along a single line of action.

[0010] In yet another exemplary embodiment, the present disclosure provides an adhesive-free restraint device for a DPT assembly internal component. The restraint device includes a cantilevered support extending from the front or rear cover of the DPT assembly. The cantilevered support resiliently engages a structural housing, which biases a flow path element through the structural housing and into engagement with a tapered stopcock bore. The stopcock includes a collar, which may be divided into two or more segments that engage an equal number of retention slots in the rear cover pedestal to counter the bias imposed by the cantilevered support. When fully assembled, the cantilevered support presses the DPT / stopcock subassembly collar into its retention slot, maintaining the joint under constant compression and maintaining an airtight seal.

[0011] This Summary is provided by way of example only, and not by way of limitation. Other aspects of the disclosure can be understood in light of the entire disclosure, including the entire text, claims, and accompanying drawings. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a schematic diagram of a patient monitoring system having a single monitor and a differential pressure transducer (DPT) system. [Figure 2] 1 is a schematic diagram of a patient monitoring system having multiple connected devices, including a DPT system and a multi-signal pressure cable connected to the DPT system. [Figure 3] FIG. 1 is a perspective view of a DPT system with a hybrid connector. [Figure 4] FIG. 4 is a front plan view of the DPT system of FIG. 3, including a DPT subassembly having a fluid channel with a stopcock. [Figure 5] FIG. 5 is a perspective view of the components of the DPT subassembly of FIG. 4 arranged along the axis of a fluid channel. [Figure 6] FIG. 5 is a cross-sectional perspective view of the components of the DPT subassembly of FIG. 4 disposed along the axis of a fluid channel. [Figure 7] FIG. 7 is an exploded view of the components of the DPT subassembly of FIGS. 4-6, including the rear cover, structural assembly, flow path elements, and stopcock. [Figure 8A] FIG. 1 is an exploded view of the flowpath elements and structural housing. [Figure 8B] FIG. 1 is an exploded view of the flowpath elements and structural housing. [Figure 8C] FIG. 10 is a cross-sectional perspective view of the structural housing showing receptacle features. [Figure 8D] FIG. 10 is a cross-sectional perspective view of the structural housing showing the flow path elements, as well as the protrusions and receptacles. [Figure 8E] FIG. 10 is a cross-sectional view showing the interface of a flow path element, a structural housing, and a connector cable. [Figure 9A]FIG. 1 is a longitudinal cross-sectional view of a DPT subassembly showing the flow path elements, structural housing, and stopcock. [Figure 9B] FIG. 10 is an interior perspective view of the front cover showing an exemplary cantilever support. [Figure 9C] FIG. 10 is an interior perspective view of the front cover showing an exemplary cantilever support. [Figure 9D] FIG. 10 is a perspective detail view of the interface between the flowpath elements, stopcocks, and support pedestals of the rear cover. [Figure 9E] FIG. 10 is a cross-sectional view of the stopcock and rear cover pedestal showing hard stop features. [Figure 10A] FIG. 5 is an exploded view of the DPT subassembly of FIG. 4 showing separate analog and digital sensors with dedicated sensor connectors. [Figure 10B] FIG. 5 is a perspective view of the DPT subassembly of FIG. 4 showing separate analog and digital sensors with dedicated sensor connectors. [Figure 11] FIG. 6 is a top view of the DPT subassembly shown in FIG. 5 with the sensor removed, revealing the sensor cavity. [Figure 12] 10A, 10B, and 11 along the centerline axis of the fluid channel, showing the channel opening of the sensor cutout. FIG. [Figure 13] 13 is a cross-sectional perspective view of the DPT subassembly of FIGS. 10A, 10B, 11, and 12 showing the position of both sensors and their respective notches relative to the fluid channel. FIG. [Figure 14] FIG. 4 is a perspective view of the signal connector of FIG. 3. [Figure 15A] FIG. 15 is an enlarged perspective view of the plug of the signal connector of FIG. 14. [Figure 15B] FIG. 15 is an enlarged perspective view of the plug of the signal connector of FIG. 14. [Figure 16] FIG. 15C is a perspective view showing the internal wires, pins, and wire guides of the plug of FIGS. 15A and 15B. [Figure 17]FIG. 17 is a perspective view of the components of FIG. 16 enclosed within a modular plug. [Figure 18] FIG. 3 is a perspective view of the multi-signal pressure cable of FIG. 2. [Figure 19] FIG. 19 is a perspective view of the receptacle end of the multi-signal pressure cable of FIG. 18 with the outer housing of the multi-signal pressure cable omitted. [Figure 20A] FIG. 20 is a perspective view of the multi-signal pressure cable of FIG. [Figure 20B] FIG. 20 is a perspective view of the multi-signal pressure cable of FIG. [Figure 21] FIG. 21 is a perspective view of the multi-signal pressure cable of FIG. 20 with the overmold omitted to expose the oval socket. [Figure 22A] FIG. 22 is a perspective view of the multi-signal pressure cable of FIG. 21 with the overmold omitted to expose the electrical contacts and contact carrier. [Figure 22B] FIG. 22 is a perspective view of the multi-signal pressure cable of FIG. 21 with the overmold omitted to expose the electrical contacts and contact carrier. [Figure 23] FIG. 22C is a perspective view of the multi-signal pressure cable of FIGS. 22A and 22B with the contact support omitted to show the shape of the electrical contacts. [Figure 24] FIG. 22B is a cross-sectional view of the oval socket and contact carrier of FIGS. 21 and 22A. [Figure 25A] FIG. 4 is a perspective view of a signal connector of the DPT system of FIG. 3 connected to a receptacle. [Figure 25B] FIG. 4 is a cross-sectional perspective view of a signal connector of the DPT system of FIG. 3 connected to a receptacle. DETAILED DESCRIPTION OF THE INVENTION

[0013] The above-identified figures illustrate one or more embodiments described by the present disclosure; however, as noted in the description, modifications and variations of these embodiments are contemplated. In all cases, the present disclosure presents the invention by way of representation, and not limitation. It is to be understood that numerous other modifications may be devised by those skilled in the art from the present disclosure, and therefore, such modifications are within the scope and spirit of the principles of the present invention. The figures may not be drawn to scale, and applications and embodiments of the present invention may include features and components not specifically shown in the drawings.

[0014] The present disclosure provides a dual-sensor or multi-sensor differential pressure transducer system for use in IV fluid delivery. The examples provided below present two sensors, e.g., one analog sensor and one digital sensor, arranged in parallel at a common axial position along the IV fluid flow path. The sensors are contained within and supported by a common assembly including a flow path element, with the fluid channel defining the IV fluid flow path sandwiched between the sensors but extending axially beyond the front and rear covers. The front and rear covers and the flow path element cooperate to hold the stopcock in axial, sealed fluid connection with the downstream end of the flow path element, while a structural support disposed between the DPT housing and the flow path element cooperates with the flow path element to hold both sensors in contact with their respective sensor cavities and in fluid communication with the fluid channel.

[0015] The DPT system disclosed herein includes a DPT subassembly with separate, miniature digital and analog pressure sensors, laterally offset and axially aligned within their respective cavities, connected to the subassembly's fluid channels via symmetrically spaced axial notches. The DPT subassembly connects to a patient monitor via a hybrid signal connector incorporating separate analog and digital signal contacts within a single signal plug that is received by a matching hybrid receptacle. The DPT system includes a signal connector in which sets of electrical conductors contacting the digital and analog sensors are enclosed within a common conductor cable, conducting parallel sensor signals from the sensors to a shared connector plug. This shared connector plug includes separate contacts for each sensor, e.g., one set of digital contacts and one set of analog contacts, within a common form factor that can be accepted by a digital connector socket, an analog connector socket, or a hybrid multi-signal receptacle.

[0016] FIGS. 1 and 2 provide schematic diagrams of two exemplary patient monitoring systems incorporating DPT system 10. FIG. 1 illustrates patient monitoring system 1000, while FIG. 2 illustrates a related patient monitoring system 2000. Patient monitoring systems 1000 and 2000 are non-exclusive examples of possible systems in which DPT system 10 may be used and are provided to illustrate different use cases for each of DPT system 10. Several aspects of FIGS. 1 and 2 are collectively discussed below. Both FIGS. 1 and 2 illustrate an IV fluid source 12, a patient 14, and a patient monitor cable 16. FIG. 1 additionally illustrates a single transport monitor 18, while FIG. 2 illustrates a multi-signal pressure cable 20 that provides signal connections to both a primary monitor 22 and a secondary monitor 24.

[0017] Patient monitoring systems 1000 and 2000 are used to track vital and / or treatment information of patient 14 while the patient 14 receives medical care, including the provision of IV fluids. In one exemplary embodiment, patient monitoring system 1000 may be a system used in a transport environment, such as a mobile device used during transport of a patient from an emergency room or operating room to an intensive care unit. In contrast, patient monitoring system 1000 may be a system in a stationary environment, such as a hospital intensive care unit or operating room. However, more generally, patient monitoring systems 1000 and 2000 may represent any separate systems, including multiple vehicles or separate stationary environments, between which a patient equipped with a single DPT system 10 may be transported.

[0018] Fluid source 12 is shown schematically as an IV bag, but more generally may be any type of IV fluid supply. IV fluid from fluid source 12 may be delivered to patient 14, for example, via an IV shunt or needle inserted into the patient's arm. More generally, fluid source 12 may be any type of reservoir capable of safely delivering IV fluid continuously to patient 14 via an IV attachment. DPT system 10 is a transducer system disposed between fluid source 12 and patient 14 to sense differential fluid pressure between them and thereby detect fluid flow. DPT system 10 generates sensor signals reflecting the IV fluid differential pressure. These sensor signals are received and processed by patient monitoring equipment for various purposes, including, but not limited to, metering medication, tracking IV fluid dispensing, and triggering dose alerts. As shown in subsequent figures and described in detail below, the DPT system 10 includes a fluid channel through which IV fluid flows from a fluid source 12 to a patient 14, and an electrical connector configured to removably connect to a patient monitoring device and provide differential pressure data to the patient monitoring device.

[0019] As shown in FIG. 1 , which illustrates a patient monitoring system 1000, a patient monitor cable 16 connects the DPT system 10 to a transport monitor 18. As noted above, the patient monitoring system 1000 can be a transport environment in which the transport monitor 18 is a mobile patient vitals monitor or similar device. More generally, however, the transport monitor 18 is a first embodiment of an electronic patient monitoring device that differs from subsequent embodiments. Hereinafter, the transport monitor 18 will be described as a device arranged to receive differential pressure data from the DPT system 10 as analog electrical signals. These signals are generated by an on-board analog pressure sensor positioned proximate to the fluid flow path through the DPT system 10, as will be described in detail with reference to subsequent figures.

[0020] The patient monitoring system 2000 of FIG. 2 operates substantially similarly to the patient monitoring system 1000 of FIG. 1, but, as noted above, includes separate primary and secondary monitors 22 and 24. The primary and secondary monitors 22 and 24 are configured to receive different types of signals. To facilitate the DPT system 10 functioning as both monitor types, the DPT system 10 is configured to generate both types of signals, and the multi-signal pressure cable 20 is configured to receive and split these two signal types into separate connector plugs, each arranged to interface with either the primary monitor 22 or the secondary monitor 24. In short, in the more general case, the multi-signal pressure cable 20 has one input fitting and multiple output fittings. The single input fitting receives multiple signal types, while each output fitting provides only one of these signal types to the attached device. In the remainder of this disclosure, these different signal types will be described primarily as analog electrical signals and digital electrical signals, although in the most general case the same processing may be advantageously applied to other combinations of distinct signals, such as digital electrical signals and digital optical signals. Similarly, while this disclosure is directed to an embodiment of DPT system 10 configured to generate two types of signals (i.e., analog and digital signals), alternatives having more than two dedicated sensors, or any number of sensors generating more than two distinct signals, are within the scope and spirit of this disclosure.

[0021] As shown in FIG. 2, the patient monitoring system 2000 includes a patient monitor cable 16 for connecting to a secondary monitor 24. The DPT system 10 generates digital and analog signals from separate pressure sensors within a shared housing and provides these separate signals to a primary monitor 22 and a secondary monitor 24, respectively. The patient monitor cable 16 connects the analog output of the multi-signal pressure cable 20 to the secondary monitor 24, while the digital output of the multi-signal pressure cable 20 is connected directly to the primary monitor 22, which is configured to receive the digital signal. FIGS. 1 and 2 show the same cable or type of patient monitor cable 16 used to connect the multi-signal pressure cable 20 to both the (analog) transport monitor 18 and the (analog) secondary monitor 24. However, in some cases, different or additional connectors may be included between the multi-signal pressure cable 20 and either or both of the primary monitor 22 and the secondary monitor 24.

[0022] While FIG. 2 shows both a primary and a secondary monitor communicatively coupled to DPT system 10, either monitor may be redundant depending on the particular environment of patient monitoring system 2000. In such cases, the multiple signal outputs of DPT system 10 and the branching configuration of multi-signal pressure cable 20 allow a single DPT system to be used with either available or appropriate type of system. In this manner, DPT system 10 can act as a multi-function pressure sensing system regardless of monitor type, eliminating the need to swap one DPT system for another, for example, when migrating from an analog environment (e.g., an environment with patient monitoring system 1000) to a digital environment using primary monitor 22 (patient monitoring system 2000). The form and function of DPT system 10 are described in detail below.

[0023] Both Figures 3 and 4 show DPT system 10 in more detail. Figure 3 provides a perspective view of DPT system 10, showing DPT subassembly 26 and hybrid connector 28. DPT subassembly 26 includes flowpath element 30 (including upstream fitting 32), stopcock 34, front cover 36, and rear cover 38. Hybrid connector 28 includes connector cable 40 and signal connector 42. Figure 4 is a front plan view of the DPT system of Figure 3, highlighting DPT subassembly 26.

[0024] The DPT subassembly 26 delivers IV fluid and generates corresponding digital and analog differential pressure signals. The hybrid connector 28 transmits both sets of signals to a connected device configured to receive either the digital or analog signals, or to a device capable of receiving both signals (such as the multi-signal pressure cable 20). In some embodiments, the DPT system 10 may be a factory-sterilized, single-use kit. However, in the most common case, at least the DPT subassembly 26 is sterilized prior to use.

[0025] DPT subassembly 26 is a multi-sensor fluid handling device configured to receive IV fluid from fluid source 12 (see FIGS. 1 and 2) and deliver the IV fluid to a patient IV, for example, via a needle or shunt through stopcock 34. Flow path elements 30 of DPT subassembly 26 are rigid bodies that define fluid channels through DPT subassembly 26 (fluid channel 88; see FIGS. 5 and 6 below). Sensors within DPT subassembly 26 (e.g., sensor 108; see FIG. 6 below) are disposed adjacent to one another and in fluid communication with the interior of flow path elements 30 for sensing differential pressure within DPT subassembly 26.

[0026] The upstream end of the flow path element 30 includes an upstream fitting 32 for forming a fluid-tight connection with a fluid line from the fluid source 12. In the embodiment shown in Figure 3, the upstream fitting 32 is a threaded front portion of the flow path element 30. However, in some cases, the upstream fitting 32 can include other connecting or sealing features, such as a clamp or gasket.

[0027] The downstream end of the flow path element 30 terminates in a stopcock 34. The stopcock 34 is disposed downstream of the sensor element within the DPT subassembly 26 and is a valve or valves capable of stopping the flow of fluid from the DPT subassembly 26.

[0028] The flowpath elements 30 and other components of the DPT subassembly 26 are enclosed between a front cover 36 and a rear cover 38. The front cover 36 and rear cover 38 cooperate to form the necessary fluid seal, secure a connector cable 40, and support the sensor elements, which are described in more detail below with reference to FIG. 6. The front cover 36 and rear cover 38 also define the form factor of the DPT subassembly 26 into which most of the other components, including multiple sensors, fit.

[0029] FIG. 4 illustrates the flow path element 30, upstream fitting 32, and connector cable 40 of the hybrid connector 28 described above, and provides further details of the stopcock 34, front cover 36, and rear cover 38. More specifically, FIG. 4 shows the flow path window 44 and cover snap fitting 46 of the front cover 36, as well as the flush tab 48, and the flow path connector 50, fluid line connectors 52 and 54, and stopcock lever 56 of the stopcock 34. FIG. 4 also defines cross section 6-6, with the planar cross section 6-6 forming the cross section of FIG. 6 (described below).

[0030] The flow path window 44 exposes the flow path element 30 for viewing, allowing for visualization of fluid flow through the flow path element 30. In some embodiments, the flow path window 44 can be an opening in the front cover 36. In other embodiments, where such an opening interrupts the fluid seal formed by the front cover 36 and rear cover 38 around sensitive elements, such as sensors and conductors housed therein, the flow path window 44 can be a transparent portion of the front cover 36 adjacent to the flow path element 30. Cover snap fittings 46 can tightly secure the front cover 36 to the rear cover 38, promoting the aforementioned fluid seal. In some cases, the cover snap fittings 46 can comprise daggers or flanges extending from the rear cover 38 that latch onto corresponding flanges or slots in the front cover 36, as shown in FIG. 4 . More generally, however, the cover snap fittings 46 may include daggers or flanges, or both, extending from the front cover 36 to the rear cover 38 in combination with other locking or latching mechanisms.

[0031] The flush tab 48, also known as a snap tab, acts as a stop valve within the flow path element 30 that prevents fluid flow from the upstream fitting 32 to the stopcock 34. In one embodiment, the flush tab 48 is a single-use flow-blocking element that is installed in a manner that prevents fluid flow through the flow path element 30, as described below. The flush tab 48 prevents premature fluid flow through the flow path element 30 and can be pulled outward (away from the front cover 36 of the DPT subassembly 26) to initiate flow through the DPT subassembly 26.

[0032] As noted above, the stopcock 34 is a fluid-tight valve disposed at the downstream end of the flow path element 30. The stopcock 34 is attached to the flow path element 30 via a flow path connector 50. As shown in FIG. 4 , the stopcock 34 may be a three-way valve having two fluid line connectors 52 and 54 configured to attach to downstream tubing or other fluid lines, such as a patient needle or shunt, and / or a drain. In the illustrated embodiment, the stopcock lever 56 is actuable between at least three valve states: a state that connects the flow path element 30 to the fluid line connector 52, a state that connects the flow path element 30 to the fluid line connector 54, and a state that connects the fluid line connectors 52 and 54 to each other. In some embodiments, the stopcock lever 56 may also be actuated to a position that fluidly isolates the flow path element 30 and fluidly isolates both the fluid line connectors 54 and 56 from each other.

[0033] Figures 5 and 6 provide views of the internal structure and fluid handling of the DPT subassembly 26. Figure 5 is a perspective view of the DPT subassembly 26 with the front cover 36 removed, showing the flowpath element 30 (including the upstream fitting 32), stopcock 34, rear cover 38, and flush tab 48, as generally described above with reference to the previous figures. In addition, Figure 5 shows the structural housing 58, which includes snap slots 60 for snap attachment 62 to the rear cover 38 and a flowpath recess 64 for receiving the flowpath element 30. Figure 5 also shows portions of the rear cover 38 not visible in the previous figures, including the cover opening 66 at the cover inlet side 68, the cover outlet 70 and lateral sides 72, respectively, and the pedestal 74 having a retention slot 76. The flowpath connector 50 includes a flowpath connector sleeve 78 with a collar 80 received in the retention slot 76. The flowpath inlet 82 of the flowpath element 30 is also visible in Figure 5.

[0034] The structural housing 58 is a substantially rigid support disposed between the front cover 36 and the rear cover 38, respectively. The structural housing 58 supports and holds the flowpath element 30 in a fixed position relative to both covers and relative to the stopcock 34. In the illustrated embodiment, the structural housing 58 includes symmetrically arranged snap slots 60 (only one snap slot is visible in FIG. 5; the remaining snap slots are located on the opposite side of the structural housing 58, rearward of the flowpath element 30) through which snap fittings 62 latch to lock the structural housing 58 in place. The snap fittings 62 may be barbed flanges extending from the rear case 38, as shown. The structural housing 58 also includes a flowpath recess 64 and a nested bowl or partial enclosure that receives the flowpath element 30 and positions it relative to both the rear cover 38 and the sensitive electronics (see FIG. 6).

[0035] As previously mentioned, the rear cover 38 cooperates with the front cover 36 to enclose the flowpath elements 30 and the structural housing 58. As shown in FIG. 5 , the rear cover 38 includes a cover opening 66 that allows the upstream fitting 32 to pass through the cover inlet side 68, while the opposite cover outlet side 70 does not obstruct the stopcock 34, which is instead surrounded by the front cover 36. The cover lateral sides 72 are flanges on opposite sides of the rear cover 38 and, together with the cover inlet side 68 and the cover outlet side 70, respectively, define peripheral flanges that fit snugly against the front cover 36.

[0036] The rear cover 38 also includes a pedestal 74, structural support for the flowpath connector sleeve 78, and the upstream-most portion of the stopcock 34 that surrounds the downstream-most portion of the flowpath element 30. The pedestal 74 includes a retention slot 76 and a semi-cylindrical groove that aligns with the collar 80 and corresponding alignment and retention features of the flowpath connector sleeve 78. During installation, the flowpath connector sleeve 78 is fitted around the downstream end of the flowpath element 30 and then pressed down into the pedestal 74 so that the collar 80 is axially retained by the retention slot 76. This attachment supports the flowpath element 30 and the stopcock 34 and prevents the stopcock 34 from disengaging from the flowpath 30.

[0037] FIG. 6 illustrates the internal structure of the DPT subassembly 26 and the connected components, excluding the stopcock 34 and rear cover 38, as described above with respect to FIG. 5. FIG. 6 is a perspective cross-sectional view taken along plane section 6-6 of FIG. 4, showing the hybrid connector 28 (including the connector cable 40), the flow path element 30, the flush tab 48, the structural housing 58, and the flow path inlet 82, as described above. Additionally, FIG. 6 illustrates various fluid flow-related elements, including a flow path outlet 84, a flush tab collar 86, a fluid channel 88 defined by channel walls 90 and separated into an upstream channel portion 92 and a downstream channel portion 94 by a channel dividing wall 96, a flush portion inlet 98 and a flush portion outlet 100, respectively, a flush portion chamber 102, and a flush tab plunger 104 with a flush tab pull 106. FIG. 6 also introduces a sensor 108, which is fluidly connected to the fluid channel 88 by a sensor cutout 110. In addition to the aforementioned pedestal 74, the structural housing 58 also includes a structural housing base 112 and a sensor support 114. The connector cable 40 includes a plurality of conductors 116 separated and aligned by conductor separators 118 and positioned by conductor supports 120. A clamp flange 122 of the flow path element 30 and a clamp flange 124 of the structural housing 58 both abut the connector cable 40, and the flow path element 30 includes a stopcock abutment portion 126 near the flow path outlet 84.

[0038] The flowpath element 30 extends along axis A and includes a flush tab collar 86 that surrounds and retains the flush tab 48. The flowpath element 30 defines a fluid channel 88, which is a generally cylindrical passage circumferentially defined by a channel wall 90 and oriented along axis A. The flowpath element 30 extends from an upstream end adjacent the upstream fitting 32 at a flowpath inlet 82 to a downstream end adjacent the stopcock 34 at a flowpath outlet 84. As shown in FIG. 6 , the fluid channel 88 has a tapered and diverging diameter that is narrowest (having a diameter d) where it is interrupted by a channel divider wall 96. The diameter d may be, for example, 1 mm to 8 mm. The channel divider wall 96 is axially aligned with the flush tab 48 and divides the fluid channel 88 into an upstream channel portion 92 and a downstream channel portion 94. The upstream channel portion 92 extends from the channel inlet 82 to the channel divider wall 96, and the downstream channel portion 94 extends from the channel divider wall 96 to the channel outlet 84. The upstream channel portion 92 and the downstream channel portion 94 are connected only via the flush tab 48. More specifically, the flush tab 48 includes a flush portion inlet 98 and a flush portion outlet 100, which allow flow from the upstream channel portion 92 to a flush portion chamber 102 and from the flush portion chamber 102 to the downstream channel portion 94, respectively. A flush tab plunger 104, a rubberized stopper, or other malleable stopper, defines the flush portion chamber based on its position relative to the flush portion inlet 98 and the flush portion outlet 100, respectively. A flush tab pull 106 forms a handle for pulling the flush tab plunger 104 away from the flush portion inlet 98 and the flush tab outlet 100. When in the closed position, the flush tab plunger 104 prevents fluid flow through the flowpath element 30 by blocking the flush section inlet 98 and the flush section outlet 100 .The flush portion chamber 102, when withdrawn radially away from the axis A of the flowpath element 30, fluidly connects the upstream channel portion 92 to the downstream channel portion 94. As mentioned above, some embodiments of the flush tab 48 may be a single-use seal that is not designed to reclose after being opened, i.e., after the flush tab plunger is withdrawn radially away from the flowpath element 30.

[0039] FIG. 6 also shows a sensor 108, which is a differential pressure transducer disposed alongside and abutting the flow path element 30. While only one sensor 108 is shown in FIG. 6, a second sensor 108 can be located forward in the planar cross section. A sensor cutout 110 forms a fluid connection between the fluid channel 88 and the sensor 108. As shown in FIG. 6, the sensor cutout 110 is axially elongated and located within the downstream channel portion 94.

[0040] The structural housing 58 includes a structural housing base 112, which is a substantially flat plate anchored to the rear cover 38 (see FIG. 5 ). Extending upwardly from the structural housing base 112 are a plurality of flanges or fingers, including a sensor support 114, a conductor separator 118, a conductor support 120, and a clamp flange 124. The sensor support 114 serves as a pedestal that holds the sensor 108 in contact with the flowpath element 30. The sensor 108 generates sensor data in the form of a sensor signal transmitted through connected conductors 116. In the illustrated embodiment, four separate conductors 116 are attached to separate contacts on the sensor 108. The conductors 116 are separated in a common plane by the conductor separators 118 where they separate from the connector cable 40. Conductor separators 118 are flanges that extend vertically from the structural housing base 112 to the supporting conductors 116, with fingers extending between each conductor 116 and adjacent conductors. The conductors 116 are also supported and aligned between the conductor separators 118 and the contacts of the sensor 108 by conductor supports 120.

[0041] The connector cable 40 surrounds the conductors 116 in an insulating and protective cover clamped between a clamp flange 122 extending from the flow path element 30 toward the structural housing base 112 and a clamp flange 124 extending upward from the structural housing base 112 toward the flow path element 30. This clamping holds the connector cable 40, reducing or eliminating tension on the conductors 116 that could destroy contact with the sensor 108, and also forms a fluid seal around the connector cable to protect the sensor 108 and conductors 116 from shorting out.

[0042] The flow path element 30 terminates in an axial flow path abutment portion 126, which is a tapered portion disposed radially inside the flow path connector sleeve 78 (see FIG. 5) and closely overlaps the flow path connector sleeve 78.

[0043] 7 is an exploded view of the components and assembly features of the DPT subassembly 26. The front cover 36 and rear cover 38 have been displaced along axis BB, exposing the flowpath element 30, stopcock 34, flowpath connector 50, structural housing 58, and sensor 108. The flowpath element 30 has been displaced from the structural housing 58 along axis BB, exposing the connector cable 40 and sensor 108. The stopcock 34 and flowpath connector 50, including the flowpath connector sleeve 78 and collar 80, have been separated from the flowpath element 30 along axis AA. As shown, the flush tab 48 is installed within the flowpath element 30.

[0044] DPT subassembly 26 includes several features that simplify assembly, eliminate manufacturing steps, and / or reduce manufacturing time. For example, snap-fit ​​features can secure flow path element 30 to structural housing 58. In the example shown in Figures 7, 8A, 8B, 8C, and 8D, the snap-fit ​​features include protrusions 150A, 150B, 150C, and 150D extending from flow path element 30 that are received by receptacles 152A, 152B, 152C, and 152D in structural housing 58. In other examples, protrusions 150A, 150B, 150C, and 150D can extend from structural housing 58 and engage receptacles 152A, 152B, 152C, and 152D on flow path element 30. During assembly, the flow path element 30 translates along the BB axis until the protrusions 150A, 150B, 150C, and 150D engage the receptacles 152A, 152B, 152C, and 152D and the flow path recess 64 receives the outer periphery of the flow path element 30, securing the flow path element 30 to the structural housing 58.

[0045] In each embodiment, protrusions 150A, 150B, 150C, and 150D are parallel to one another along axis BB, facilitating engagement with receptacles 152A, 152B, 152C, and 152D along a single line of action (i.e., axis BB). Completing the process using a minimal number of actions simplifies the assembly process compared to processes requiring multiple steps assembled along multiple lines of action. In this embodiment, assembling flowpath element 30 into structural housing 58 only requires application of force to flowpath element 30 along axis BB, thereby simplifying assembly of DPT subassembly 26. Further improvements to the assembly process come through automated assembly techniques, which are more easily implemented when assembly steps and lines of action are minimized.

[0046] 8A and 8B are perspective views of flow path element 30 and structural housing 58 prior to assembly, showing exemplary snap-fit ​​portion projections 150A, 150B, 150C, and 150D and receptacles 152A, 152B, 152C, and 152D. While this embodiment shows four projections 150A, 150B, 150C, and 150D and four receptacles 152A, 152B, 152C, and 152D, other embodiments may form the snap-fit ​​portion with fewer or more projections and an equal number of receptacles.

[0047] As shown, the flowpath element 30 includes a side plate 154 extending laterally away from the channel wall 90 such that an axis BB is perpendicular to the side plate 154. The projections 150A, 150B, 150C, and 150D include respective beams 156A, 156B, 156C, and 156D, barbs 158A, 158B, 158C, and 158D, and, in some embodiments, ribs 160A, 160B, 160C, and 160D. The beams 156A, 156B, 156C, and 156D extend perpendicularly from an exterior corner of the side plate 154 that is parallel to the axis BB. The direction of extension of each beam is defined by a respective beam axis 162A, 162B, 162C, and 162D. Each beam axis extends longitudinally through the geometric center of the respective beam cross-section. The distal ends of opposing beams 156A, 156B, 156C, and 156D of shroud 154 include barbs 158A, 158B, 158C, and 158D that project laterally outward from their respective beams 156A, 156B, 156C, and 156D. Each barb 158A, 158B, 158C, and 158D defines a trapezoidal portion as viewed along axis AA formed by a respective tapered surface 164A, 164B, 164C, and 164D and a respective lip surface 166A, 166B, 166C, and 166D. Tapered surfaces 164A, 164B, 164C, and 164D face away from side plate 154 to engage mating surfaces of structural housing 58 during insertion.

[0048] In some embodiments, one or more of beams 156A, 156B, 156C, and 156D include ribs 160A, 160B, 160C, or 160D to increase the flexural modulus of the respective projections 150A, 150B, 150C, and 150D. Each of ribs 160A, 160B, 160C, or 160D extends longitudinally along one of beams 156A, 156B, 156C, and 156D from side plate 154 to a respective barb 158A, 158B, 158C, and 158D, or extends an intermediate distance between side plate 154 and a respective barb 158A, 158B, 158C, and 158D. The cross section perpendicular to the beam axes 162A, 162B, 162C, and 162D and the length of each rib 160A, 160B, 160C, and 160D can be adjusted for each beam 156A, 156B, 156C, and 156D, with some protrusions 150A, 150B, 150C, and 150D having a greater or lesser flexural modulus than other protrusions 150A, 150B, 150C, and 150D. Ribs 160A, 160B, 160C, and 160D can have a constant or variable cross-sectional area along beam axes 162A, 162B, 162C, and 162D, and in some embodiments, foam gussets 168A, 168B, 168C, and 168D (see FIG. 8D ) join beams 156A, 156B, 156C, and 156D to side panels 154 to further increase the flexural modulus of one or more protrusions 150A, 150B, 150C, and 150D.

[0049] As shown in FIG. 8A, upstream beams 156A and 156B are closest to channel inlet 82, while downstream beams 156C and 156D are closest to channel outlet 84. Upstream beams 156A and 156B include ribs 160A and 160B that have larger cross-sectional areas than corresponding ribs 160C and 160D of downstream beams 156C and 156D. Ribs 160A and 160B extend the entire length of beams 156A and 156B from side plate 154, while ribs 160C and 160D extend an intermediate distance from side plate 154 toward barbs 158C and 158D, as represented by rib 160C shown in FIG. 8A. Additionally, the cross-sectional area of ​​ribs 160A and 160B increases toward side panel 154 to form gussets 168A and 168B (see FIG. 8D ). In the illustrated embodiment, upstream beams 156A and 156B and associated ribs 160A and 160B are identical. Similarly, downstream beams 156C and 156D and associated ribs 160C and 160D are identical. Thus, the flexural modulus of beams 156A and 156B about their minor dimensions is increased to a greater extent than the flexural modulus of beams 156C and 156D about their minor dimensions. In other embodiments, the flexural modulus of beams 156C and 156D about their minor dimensions may be higher than that of beams 156A and 156B. In still other embodiments, each of beams 156A, 156B, 156C, and 156D may have a different flexural modulus.

[0050] Increasing the flexural modulus for the minor dimension of beam 156 increases the insertion force as well as the extraction force required to separate flow path element 30 from structural housing 58, although an increase in insertion force does not necessarily equate to an increase in withdrawal force. The geometry of protrusions 150A, 150B, 150C, and 150D, such as the length, width, and thickness of beams 156A, 156B, 156C, and 156D and / or ribs 160A, 160B, 160C, and 160D, and the material of flow path element 30, can be selected to adjust the insertion and / or withdrawal force. In some embodiments, the force required to engage protrusions 150A, 150B, 150C, and 150D of flow path element 30 with receptacles 152A, 152B, 152C, and 152D of structural housing 58 ranges from 4 kilograms to 14 kilograms (or approximately 9 pounds to 30 pounds). In some embodiments, the pull-out force can range from 9 kilograms to 16 kilograms (or about 20 pounds to 35 pounds). In some embodiments, the pull-out force is greater than 11 kilograms (or about 25 pounds).

[0051] Each of receptacles 152A, 152B, 152C, and 152D is formed by a void, cavity, or slot in structural housing base 112 and / or sidewall 170 of structural housing 58. Receptacles 152A, 152B, 152C, and 152D include respective pockets 172A, 172B, 172C, and 172D, undercuts 174A, 174B, 174C, and 174D, and, in some embodiments, openings 176A, 176B, 176C, and 176D. Pockets 172A, 172B, 172C, and 172D are open along axis BB to receive barbs 158A, 158B, 158C, and 158D of projections 150A, 150B, 150C, and 150D. The cross-sectional areas of pockets 172A, 172B, 172C, and 172D perpendicular to axis BB accommodate protrusions 150A, 150B, 150C, and 150D throughout insertion of flow path element 30 into structural housing 58. For example, the cross-sectional area of ​​one or more pockets 172A, 172B, 172C, and 172D can expand in the direction of deflection associated with each of protrusions 150A, 150B, 150C, and 150D during insertion. With reference to the example shown by FIGS. 8A and 8B, beams 156A and 156C bend inward toward opposing beams 156B and 156D, and beams 156B and 156D also deflect inward during insertion. 8A, pockets 172A, 172B, 172C, and 172D can extend further inward (i.e., toward axis AA) to accommodate respective beams 156A, 156B, 156C, and 156D (i.e., larger lateral dimensions), while the centers of pockets 172A, 172B, 172C, and 172D can extend to accommodate ribs 160A, 160B, 160C, and 160D, if desired. Thus, the cross-sectional areas of pockets 172A, 172B, 172C, and 172D perpendicular to axis BB match the cross-sections of respective beams 156A, 156B, 156C, and 156D, and, as required for insertion, match the cross-sections of respective ribs 160A, 160B, 160C, and 160D.

[0052] Undercuts 174A, 174B, 174C, and 174D represent portions of receptacles 152A, 152B, 152C, and 152D that extend into structural housing 58 from one of pockets 172A, 172B, 172C, and 172D and that are not open to flow path element 30 along axis BB. Undercuts 174A, 174B, 174C, and 174D receive one of barbs 158A, 158B, 158C, and 158D after flow path element 30 is fully inserted into structural housing 58. 8A also shows openings 176A, 176B, 176C, and 176D, which are optional features of receptacles 152A, 152B, 152C, and 152D. Openings 176A, 176B, 176C, and 176D extend through structural housing base 112 opposite pockets 172A, 172B, 172C, and 172D to interrupt one of undercuts 174A, 174B, 174C, and 174D. Openings 176A, 176B, 176C, and 176D enable undercuts 174A, 174B, 174C, and 174D to be formed using a two-color molding process, in which a first mold forms pockets 172A, 172B, 172C, and 172D, and a second mold forms openings 176A, 176B, 176C, and 176D and undercuts 174A, 174B, 174C, and 174D, as well as other features of structural housing 58. Forming structural housing 58 using a two-color mold, as opposed to a three-color mold (or four-color or more), further simplifies the manufacture of DPT subassembly 26.

[0053] Figure 8C is a perspective cross-sectional view perpendicular to axis AA showing receptacles 152A and 152B of structural housing 58. Features of receptacles 152A and 152B represent analogous features of receptacles 152C and 152D (not shown in Figures 8C and 8D). While the size and shape of receptacles 152C and 152D may differ from receptacles 152A and 152B, the features of receptacles 152A and 152B function in the same manner as analogous features of receptacles 152C and 152D.

[0054] As shown by the illustrated embodiment, pockets 172A and 172B extend into structural housing base 112 along axis BB from a first side, while openings 176A and 176B extend into structural housing base 112 from an opposite second side. Undercuts 174A and 174B extend laterally outward from respective pockets 172A and 172B below sidewall 170 of structural housing 58. Central portions of pockets 172A and 172B extend laterally inward to a greater extent than peripheral portions of pockets 172A and 172B to accommodate the full lengths of ribs 160A and 160B of upstream projections 150A and 150B. Because projections 150C and 150D do not include the full length of ribs, central portions of pockets 172C and 172D (not shown) do not necessarily extend laterally inward to a greater extent than peripheral portions of pockets 172C and 172D.

[0055] 8C illustrates additional features of the structural housing 58 that aid in assembly with the flow path element 30. The structural housing 58 includes a flow path recess 64 defined around the distal periphery of the side wall 170. The flow path recess 64 defines a lip that coincides with the periphery of the side plate 154 and a ledge that abuts the side plate 154 to support the flow path element 30. In some embodiments, the structural housing 58 includes a shelf surface 178 formed around the distal periphery of the side wall 170 that coincides with each of the receptacles 152A, 152B, 152C, and 152D. The shelf surface 178 is oblique to the axis BB and complementary to the respective tapered surfaces 164A, 164B, 164C, and 164D of the flow path element 30. As shown, shelf surface 178 is angled toward the interior of structural housing 58 , while tapered surfaces 164 A, 164 B, 164 C, and 164 D are angled toward the exterior of flowpath element 30 .

[0056] 8D is a cross-sectional view of flow path element 30, structural housing 58, and connector cable 40 parallel to axis BB, illustrating the complementary geometries of beams 156A and 156B, barbs 158A and 158B, pockets 172A and 172B, and undercuts 174A and 174B. Protrusions 150A, 150B, receptacles 152A, and 152B represent features of a snap-fit ​​connection between flow path element 30 and structural housing 58, while similar features of protrusions 150C, 150D, receptacles 152C, and 152D function in the same manner as described. Initially, as shown in FIG. 8D by the dotted lines representing tapered surfaces 164A and 164B, tapered surfaces 164A, 164B, 164C, and 164D abut shelf surface 178 during insertion of flowpath element 30 into structural housing 58. Upon application of an insertion force to flowpath element 30 along axis BB, beams 156A, 156B, 156C, and 156D (beams 156C and 156D not shown) deflect inwardly and clear shelf surface 178. When the flow path element 30 is engaged with the structural housing 58, the lip surfaces 166A, 166B, 166C, and 166D of the barbs 158A, 158B, 158C, and 158D abut the restraining surfaces 180A, 180B, 180C, and 180D of the respective undercuts 174A, 174B, 174C, and 174D to restrain the flow path element 30 relative to the structural housing 58 along the axis BB (undercuts 174C and 174D not shown).

[0057] FIG. 8E is a cross-sectional view perpendicular to axis AA of the flow path element 30, the structural housing 58, and the connector cable 40, illustrating additional features of the flow path snap fit. The flow path element 30 includes a cable pedestal 182, and the structural housing 58 includes a saddle 184. The cable pedestal 182 is a beam member extending from the channel wall 90 and / or the side panel 154 toward the connector cable 40. In some embodiments, the cable pedestal 182 is centered between two of the protrusions 150A, 150B, 150C, and 150D. As shown, the cable pedestal 182 extends between the upstream protrusions 150A and 150B. An end face 186 of the cable pedestal 182 engages a protective cover 188 of the connector cable 40. The end face 186 can be flat or contoured to accommodate the protective cover 188 of the connector cable 40.

[0058] The saddle 184 is the region of the structural housing 58 opposite the cable pedestal 182 that engages the protective cover 188 of the connector cable 40. In some embodiments, the saddle 184 is a recessed region of the structural housing base 112. In other embodiments, the saddle 184 protrudes from the structural housing base 112 and engages the protective cover 188 of the connector cable 40 at a saddle surface 190. Like the end surface 186, the saddle surface 190 can be flat or contoured to accommodate the protective cover 188 of the connector 40. Exemplary contours for the end surface 186 and the saddle surface 190 include a semi-cylindrical, semi-elliptical, semi-circular, or semi-oval shape. The contours of the end surface 186 and the saddle surface 190 can be the same or different. As shown in FIG. 8E , the end surface 186 and the saddle surface 190 are semi-elliptical and each engages the semi-elliptical contour of the connector cable 40.

[0059] The protective cover 188 of the connector cable 40 provides electrical insulation and environmental protection for the conductors extending between the sensor 108 and the signal connector 42. Additionally, the protective cover 188 of the connector cable 40 is a resilient material that exerts a restoring force under compression, thus acting as a spring. One or both of the cable pedestal 182 and the saddle 184 may interfere with the protective cover 188 of the connector cable 40 when the flow path element 30 is fully inserted into the structural housing 58. For example, the interference distance between the protective cover 188 and the cable pedestal 182 and the interference distance between the protective cover 188 and the saddle 184 is between about 0.10 millimeters and about 0.50 millimeters, inclusive (i.e., between about 0.004 inches and about 0.020 inches, inclusive). In some embodiments, the interference distance between the protective cover 188 and the cable pedestal 182 is the same as the interference distance between the protective cover 188 and the saddle 184, while in other embodiments, the interference distances of each interface may be different. The interference distance between protective cover 188 and one or both of cable pedestal 182 and saddle 184 imposes a restoring force on flowpath element 30 along axis BB, displacing lip surfaces 166A, 166B, 166C, and 166D of flowpath element barbs 158A, 158B, 158C, and 158D into engagement with restraining surfaces 180A, 180B, 180C, and 180D of structural housing undercuts 174A, 174B, 174C, and 174D.

[0060] When lip surfaces 166A, 166B, 166C, and 166D abut their respective restraining surfaces 180A, 180B, 180C, and 180D, certain embodiments may include a residual interference distance between protective cover 188 and cable pedestal 182, saddle 184, or both. The residual interference distance compresses protective cover 188 and restricts movement of connector cable 40 along axis AA. This restraint of connector cable 40 acts as a strain relief for conductor 116 connecting to sensor 108 within DPT subassembly 26. Any residual interference distance also acts to inhibit relative movement of flowpath element 30 and structural housing 58 along axis BB, reducing or eliminating rattle of DPT subassembly 26. Additionally, the residual compressive stresses can prevent damage to the sensor 108 during the assembly process and subsequent use by separating the flow path element 30 and the structural housing 58 and causing the lip surfaces 166A, 166B, 166C, and 166D of the protrusions 150A, 150B, 150C, and 150D to engage with the retention surfaces 180A, 180B, 180C, and 180D of the undercuts 174A, 174B, 174C, and 174D.

[0061] 9A is a cross-sectional view of the assembled DPT subassembly 26 along axis AA, which is perpendicular to axis BB. FIG. 9A is a simplified diagram of another configuration in which the flow path element 30, stopcock 34, and structural housing 58 are restrained along axis AA to the front cover 36 and rear cover 38 without adhesive.

[0062] The restraint includes one or more cantilever supports 192, a flow path connector 50, a pedestal 74, and one or more segments 194 of the collar 80. The cantilever supports 192 are beam members that extend from the front cover 36 or the rear cover 38 and resiliently engage the structural housing 58, applying a restraining force along axis AA toward the stopcock 34. The flow path connector 50 forms an integral part of the stopcock 34 or is fixed to the stopcock 34. The internal bore of the flow path connector 50 tapers from a maximum dimension at the end of the bore to a minimum dimension within the stopcock 34. The collar segments 194, adjacent to the flow path connector 50, engage one or more retention slots 76 in the rear cover pedestal 74 to counter the restraining force of the cantilever supports 192. Thus, the restraining force applied by the one or more cantilever supports 192 to the structural housing 58 along axis AA is transmitted to the flow path element 30 via the flow path recess 64 (not shown in FIG. 9A ). Under the action of the binding force, the flow path element 30 engages the tapered bore of the flow path connector 50. One or more collar segments 194 of the stopcock 34 press into and engage the retention slots 76 of the pedestal 74 to counter the binding force, thereby preventing displacement of the structural housing 58, flow path element 30, connector sleeve 50, and stopcock 34 along the axis AA.

[0063] 9B is a perspective view of the interior of the front cover 36 including an exemplary implementation of the cantilevered support 192. The front cover 36 includes a flow path window 44, a cover snap fitting 46, a cover inlet opening 196, a cover outlet opening 198, a cover inlet side 200, a cover outlet side 202, a lateral side 204, and a front side 206. The lateral side 204, the cover inlet side 200, and the cover outlet side 202 define a peripheral flange that fits snugly with the rear cover 38. The front side 206 extends between and joins the cover inlet side 200, the cover outlet side 202, and the lateral side 204. The cover snap fittings 46 extend from the peripheral flange and engage corresponding features on the rear cover 38, joining the front cover 36 to the rear cover 38. A cover inlet opening 196 extends through the cover inlet side 200 to provide clearance for the flow path element 30. A cover outlet opening 198 extends through the cover outlet side 202 to provide clearance for the flow path element 30, the flow path connector 50, and the stopcock 34. A flow path window 44 extends through the front side 204 to expose the flow path element 30 for viewing from the exterior of the front cover 36.

[0064] The cantilevered supports 192 extend away from the interior of the front cover 36 (i.e., from the front side 206). In the illustrated embodiment, the front cover 36 includes two cantilevered supports 192, each located on either side of a cover inlet opening 196. As shown in FIG. 9A , the cantilevered supports 192 are closer to and adjacent the cover inlet side 200, thereby applying a restraining force along axis AA toward the cover outlet opening 198 and the stopcock 34 through engagement with the structural housing 58. The front cover 36 may include side gussets 208 extending from the lateral sides of each cantilevered support 192 toward the lateral sides 204 and the front side 206 to increase the lateral stiffness of the front cover 36. The cantilever supports 192 may include longitudinal ribs 210 (see FIG. 9C ) that extend along the side of each spring support 192 facing the structural housing 58 to resist deflection imposed on the cantilever supports 192 by engagement with the structural housing 58.

[0065] FIG. 9C is a perspective view of region R of FIG. 9B from the cover inlet side 200, showing in more detail the cantilevered supports 192 and longitudinal ribs 210, which are also shown in FIG. 9A using dotted lines. The restraining force applied by each cantilevered support 192 to the structural housing 58 can be adjusted by adjusting the geometry of the cantilevered supports 192. Factors that affect the flexural modulus of the cantilevered supports 192 include the cross-sectional area / shape of each cantilevered support 192 perpendicular to the longitudinal direction (i.e., direction of extension) of the respective cantilevered support 192, the length of the cantilevered support 192 measured from the front cover 36 to its distal tip, and the longitudinal location of the contact zone with the structural housing 58. As shown in FIG. 9A, the cantilevered supports 192 engage the surface of the structural housing 58 opposite the cover inlet opening 196.

[0066] In some embodiments, the flexural modulus of the cantilever supports 192 can be increased using longitudinal ribs 210. The longitudinal ribs 210 extend along the sides of each cantilever support 192 that face engagement with the structural housing 58. The cross-sectional area of ​​each longitudinal rib 210 complements the cross-sectional area of ​​the cantilever support 192. In each case, the cross-sectional area of ​​the cantilever support 192, the longitudinal ribs 210, or both, can vary along the length of one or more cantilever supports 192. As shown, the cross-sectional area of ​​the cantilever supports 192 remains constant along the length of the cantilever supports 192, while the cross-sectional area of ​​the longitudinal ribs 210 varies from the front cover 36 toward the distal tip (e.g., free end) of the cantilever supports 192. Specifically, the cross-sectional area of ​​the longitudinal ribs 210 decreases linearly from the front cover 36 toward the distal tip (i.e., free end) of the cantilever supports 192. In other embodiments, the cross-sectional area of ​​the longitudinal ribs may include a combination of regions of constant cross-sectional area and regions of increasing or decreasing cross-sectional area.

[0067] 9D is a perspective detail view showing the interface of the flow path element 30, flow path connector 50, and stopcock 34 with the pedestal 74. The flow path connector 50 receives the flow path element 30 and is defined by a larger diameter region of the stopcock 34. The stopcock 34 includes a collar 80 adjacent the flow path connector 50. The collar 80 may include one or more collar segments 194 that extend circumferentially around the cylindrical body 211 of the stopcock 34. The pedestal 74 includes a semi-cylindrical channel 212 that extends along the axis AA and receives the cylindrical portions of the flow path element 30, flow path connector 50, and stopcock 34. At least one retention slot 76 extends from the semi-cylindrical channel 212 into the pedestal 74 and receives an equal number of the collar segments 194.

[0068] FIG. 9E is a cross-sectional view taken along line CC in FIG. 9D , illustrating the stopcock 34, collar segment 194, pedestal 74, and retention slot 76. In the illustrated embodiment, the stopcock 34 includes two collar segments 194, each extending circumferentially around the cylindrical body 211 and defining a sector of the stopcock 34. The collar segments 194 are semi-annular and circumferentially spaced apart from one another. As shown, the collar segments 194 are symmetrical about the plane bisecting the pedestal 74 and the intersecting axis AA. The pedestal 74 includes two retention slots 76, each of which receives one of the collar segments 194 of the stopcock 34. Thus, each retention slot 76 defines a sector of the semi-cylindrical channel 212 that coincides with one of the collar segments 194. The retention slot 76 includes an end surface 214 that abuts a side surface of the collar segment 194 to counter the restraining force generated by the cantilevered support 192. Additionally, a circumferential surface 216 of the retention slot 76 abuts a corresponding circumferential surface 218 of the collar segment 194 to restrain the stopcock 34 against rotation about the axis AA.

[0069] 5 and 9A, the partial DPT subassembly 26, consisting of the stopcock 34, flowpath element 30, and structural housing 50, engages the rear cover 38 at the snap fittings 62 and retention slots 76 of the pedestal 74, while engaging the front cover 36 at the cantilevered supports 192. The partial DPT subassembly 26 is retained to the rear cover 38 along axis BB by the snap fittings 62 engaging the snap slots 60 of the structural housing 58. The cantilevered supports 192 bend elastically, deflecting in a direction parallel to axis AA. The resiliently engaging cantilevered supports 192 with the structural housing 58 exerts a retention force on the structural housing 58 along axis AA. The retention slots 76 receive a collar 80, which may include one or more segments 194, to respond to the retention force. The distance, measured parallel to axis AA, between the outwardly facing surface of collar segment 194 and the surface of structural housing 58 abutting cantilevered support 192 is greater than the distance between the inwardly facing end face 214 of retention slot 76 and the contact surface of cantilevered support 192. Interference between structural housing 58 and cantilevered support 192 causes cantilevered support 192 to resiliently bend outward along axis AA. The cantilevered support 192, collar 80 (i.e., collar segment 194), and retention slot 76 retain stopcock 34 to flowpath element 30 without adhesive. Eliminating the need for adhesive simplifies construction of DPT subassembly 26 by eliminating the need to apply adhesive to mating surfaces of stopcock 34, flowpath connector 50, and flowpath element 30, as well as the associated adhesive curing time and adhesive curing equipment.

[0070] FIGS. 10A and 10B are exploded and perspective views, respectively, of the DPT subassembly 26, showing separate analog and digital sensors with dedicated sensor connectors. Taken together, FIGS. 10A and 10B illustrate the attachment of the connector cable 40 to the sensor 108, which is supported in contact with the flowpath element 30 by a structural housing 58 (not shown, see FIGS. 5 and 6 ). As noted above, the connector cable 40 includes multiple conductors 116. While generally described above as the sensor 108, FIGS. 10A and 10B more specifically illustrate the sensor 108 as including an analog sensor 400 and a digital sensor 402, which are contacted by analog sensor conductors 404 and digital sensor conductors 406, respectively. 10A and 10B, conductors 116 include four separate analog sensor conductors 404 and four separate digital sensor conductors 404, with each set including one ground conductor and three corresponding signal conductors. However, in alternative embodiments, more or fewer conductors may be used depending on the desired connector design and signal type.

[0071] As noted above, the multi-sensor architecture is described herein with reference to one analog differential pressure sensor and one digital differential pressure sensor, but the multi-sensor architecture more broadly encompasses any system having multiple separate, parallel differential pressure sensors arranged to generate different types of signals, the signals carried separately within a common connector cable 40. As shown herein, the analog sensor conductors 404 and the digital sensor conductors 406 all lie in a common plane that is parallel to the separate, common plane shared by the analog sensor 400 and the digital sensor 402. More generally, the analog sensor conductors 404 lie in a plane that is parallel to and immediately adjacent to the analog sensor 400, and the digital sensor conductors 406 similarly lie in a plane that is parallel to and immediately adjacent to the digital sensor 402.

[0072] 10A and 10B, sensors 400 and 402 are positioned and held by outer sensor standoffs 408 and 410 and inner sensor standoff 412 (shown in FIG. 10B). Outer sensor standoffs 408 and 410 are flanged shelves whose flanges extend laterally beyond the outer edges of analog sensors 400 and 402, respectively, while inner sensor standoff 412 is a central positioning support disposed on opposing inner edges of analog sensors 400 and 402. Thus, analog sensor 400 is positioned and held laterally between the flange of outer sensor standoff 408 and inner sensor standoff 412, while digital sensor 402 is similarly positioned and held laterally between the flange of outer sensor standoff 410 and inner sensor standoff 412. The outer sensor standoffs 408 and 410 and the inner sensor standoffs 412 cooperate with the sensor support 114 of the flowpath element 30 (see FIG. 6 and accompanying description) to lock both the analog sensor 400 and the digital sensor 402 in place relative to the flowpath element 30, and thereby relative to the fluid channel 88 (see FIG. 6). More specifically, as described in more detail below with reference to FIG. 13, the sensor support 114 and the inner sensor standoffs 412 and the outer sensor standoffs 408 and 410 cooperate to position each sensor in contact with a corresponding opening in the flowpath element 30 to form a separate, fluid-tight sensor cavity.

[0073] Contact pins 414 and 416 provide electrical contact between analog sensor 400 and digital sensor 402, and between analog sensor conductor 404 and digital sensor conductor 406, respectively. Contact pins 414 and 416 are omitted from FIG. 10A to better show other components, but as shown in FIG. 10B, are electrically insulated spring tips arranged in parallel and extending from their respective sensors to their respective conductors. More generally, contact pins 414 and 416 are separate electrical contacts between their respective conductors and sensors and are disposed, along with sensor 108 and conductor 116, within the sealed interior space between flow-path element 30 and structural housing 58 (not shown in FIGS. 10A or 10B; see FIGS. 5 and 6).

[0074] Figure 11 is a bottom view of flowpath element 30 and conductors 404 and 406 with sensors 400 and 402 removed, revealing the sensor cavities. Figure 11 shows outer centerline axis A and flowpath element 30, along with sensor standoffs 408 and 410 and inner sensor standoff 412, as described above, and analog sensor conductor 404 and digital sensor conductor 406, respectively. In addition, Figure 11 shows sensor cavity 418 positioned to abut analog sensor 400 and sensor cavity 420 positioned to abut digital sensor 402.

[0075] Cavities 418 and 420 include fluidic connection portions 422 and 424, respectively, and include sensor abutments 426 and 428, respectively. As shown in Figure 11, sensor cavities 418 and 420 are recesses in fluidic element 30 disposed between retention locations for sensors 402 and 404, respectively, and fluid channel 88. As shown in Figure 11, sensor abutments 426 and 428 are circular peripheries of sensor cavities 418 and 420 that directly abut analog sensor 400 and digital sensor 402, respectively. More generally, sensor abutments 426 and 428 are mating openings that face analog sensor 400 and digital sensor 402, respectively. As described in more detail below with respect to FIG. 13 , sensors 400 and 402 are seated in close contact with sensor abutments 426 and 428, respectively, such that sensor cavities 418 and 420 form a fluid seal with their respective sensors 400 and 402, surrounding the fluid-facing membrane of each sensor, and each cavity cooperates with its respective sensor to enclose a respective fluid chamber adjacent to and fluidly connected to fluid channel 88. Fluid connections 422 and 424 are preferably narrow passages, but in the most common implementation, each can have an angular width of up to about 25% of the circumference of fluid channel 88 at its axial location. In the illustrated embodiment, fluid connections 422 and 424 can have a circumferential width of at least 0.005 inches. Fluid connections 422 and 424 have equal axial lengths of at least 0.005 inches, selected to enable reliable molding, i.e., to avoid blockage of fluid connections 422 and 424 during part molding. Fluid connections 422 and 424 have an axial length comparable to the axial extent of the sealing faces of sensors 400 and 402. In an exemplary embodiment, fluid connections 422 and 424 may have an axial length of 0.07 inches to 0.08 inches. Fluid connections 422 and 424 are sized to allow fluid communication between channel 88 and both sensors 400 and 402, while reducing or minimizing bubble formation within fluid channel 88.

[0076] Figure 12 illustrates the intersection of fluidic connections 422 and 424 (not shown separately in Figure 12) with fluidic channel 88. Figure 12 illustrates a perspective view of the interior of fluidic element 30, oblique to centerline axis A, with fluidic channel 88 defined by channel wall 90. As shown in Figure 12, sensor cutouts 110 (see Figure 6) and 430 are openings in channel wall 90 that define the intersection of fluidic connections 422 and 424, respectively, with channel 88.

[0077] Figure 13 is a cross-sectional perspective view of flow path element 30 through a plane transverse to centerline axis A, showing the location of both sensors 400 and 402 and their respective cutouts relative to fluid channel 88. Figure 13 also shows sensor cavities 418 and 420, which include flow path connections 422 and 424, sensor abutments 426 and 428, and sensor cutouts 430 and 110, respectively. Sensor faces 432 and 434 of sensors 400 and 402, respectively, are also shown.

[0078] As described above with reference to FIGS. 11 and 12 , sensors 400 and 402 have sensor faces 432 and 434 that are in fluid contact with IV fluid flowing through fluid channel 88 in flow path element 30. Sensor faces 432 and 434 can be, for example, deformable pressure-sensitive membranes. Sensor cavities 418 and 420 in flow path element 30 cooperate with sensor faces 432 and 434, respectively, to define sensor chambers fluidly connected to fluid channel 88 through sensor cutouts 430 and 110, respectively, at the same axial location relative to centerline axis A (see, e.g., FIGS. 11 and 12 ). In the illustrated embodiment, sensor cutouts 110 and 430 are separated by an angle of approximately 135° relative to centerline axis A. More generally, sensor notches 110 and 430 can be separated by an angle greater than 90° and less than 180°, allowing fluid to flow directly and linearly from channel 88 to sensor faces 432 and 434, minimizing bubble formation.

[0079] 14 is a perspective view of hybrid connector 28 showing the distal end of connector cable 40 terminating in signal connector 42. Signal connector 42 includes plug 500, overmolded portion 502, seal ring 503, and shroud 504. Overmolded portion 502 includes grip 506.

[0080] Signal connector 42 is an electrical connector sized and shaped to mate with a corresponding receptacle (see FIGS. 18-25B below) to transmit alternative or multiple types of electrical signals through a single mechanical connection. Plug 500 is a rigid insert received within the receptacle, while shroud 504 is a deformable cover that generally cylindrically surrounds but is spaced from plug 500 so as to surround and abut the receptacle while plug 500 is installed. The plug and receptacle connection is described in more detail below with reference to FIGS. 25A and 25B. Shroud 504 helps secure plug 500 within the receptacle and forms a partial fluid seal that prevents fluid ingress to the electrical contacts of signal connector 42 while signal connector 42 is installed in the receptacle. In the illustrated embodiment, the shroud 504 is a separate component attached to the overmolded portion 502, which is a flexible or deformable base that surrounds the distal end of the connector cable 40. However, in some alternative embodiments, the overmolded portion 502 and the shroud 504 are functional components of a single protective element. The overmolded portion 502 and the shroud 504 may be flexible polymeric components, such as, for example, a rubber or rubberized sheath. As shown in FIG. 14 , the overmolded portion 502 includes a grip 506, which is a ridged, deformable portion on the proximal end of the signal connector 42 that grips the signal connector 42 to facilitate installation or removal of the plug 500 from an appropriate receptacle. The sealing ring 503 is a ring of compressible material, such as an O-ring, that helps hold the plug 500 in place in a complementary receptacle and prevents exposure of the electrical components to moisture when the plug 500 is installed.

[0081] Figures 15A and 15B show plug 500 in more detail. Figures 15A and 15B are enlarged perspective views showing oval perimeter 508, top wall 510, notches 512 and 514, keyway 516, vertical and horizontal walls 518 and 520, respectively, top pin slot 522, bottom pin slot 524, analog signal pins 526a-526d (collectively referred to as analog signal pins 526), ​​and digital signal pins 528a-528d (collectively referred to as digital signal pins 528). Figures 15A and 15B differ only in their viewing angles, with Figure 15A providing a diagonal downward view of plug 500 to more clearly show top wall 510 and analog signal pins 526, and Figure 15B providing a diagonal upward view of plug 500 to more clearly show keyway 516 and digital signal pins 528.

[0082] As noted above, plug 500 is shaped to fit into a mating receptacle, thereby compressing analog signal pins 526, digital signal pins 528, or both, against corresponding electrical contacts. The analog and digital signal pins provide electrical contacts for pressure signals from analog sensor 400 and digital sensor 402, respectively. By providing both digital and analog sensor connections in a single plug, signal connector 42 allows DPT subassembly 26 to be freely connected to digital and analog monitors without the need for additional hardware. In the illustrated example, analog signal pins 526 are arranged in a row along top wall 510, while digital signal pins 528 are arranged in a parallel row disposed opposite analog signal pins 526. The analog signal pins 526 face the distal and upward facing surface (with respect to Figures 15A and 15B), i.e., are exposed on the distal and upward facing surface, while the digital signal pins 528 face the distal and downward facing surface, i.e., are exposed on the distal and downward facing surface.

[0083] Notches 512 and 514 and keyway 516 are alignment and retention features that facilitate alignment and insertion of plug 500 into an appropriate receptacle while preventing misalignment, such as reversal of the positions of the digital and analog signal pins 526, 528. Thus, the particular form factor of plug 500 is complementary to its intended receptacle to receive and securely retain plug 500. Specifically, the overall size and shape of plug 500 is primarily represented by oval perimeter 508, which is shown in FIGS. 15A and 15B as an oval or rounded-elliptical cross-sectional shape with its major axis (i.e., longest axis) generally parallel to both the rows of analog signal pins 526 and digital signal pins 528. The periphery of plug 500 defined by oval perimeter 508 is interrupted by top wall 510, notches 512 and 514, and keyway 516. In an exemplary embodiment, the oval perimeter 508 may have a major axis no greater than 0.5 inches and a minor axis no greater than 0.37 inches to allow for engagement with a corresponding oval socket (described below).

[0084] Top wall 510 is a flat wall at the top of plug 500 (relative to FIGS. 15A and 15B ). Top pin slots 522 are evenly spaced across the top wall in the illustrated example to allow access to analog signal pins 526. In the most common case, there will be at least as many top pin slots 522 and bottom pin slots 524 as there are analog signal pins 526 and digital signal pins 528, respectively. The example provided in FIGS. 15A and 15B includes four digital signal pins 528, four analog signal pins 526, and five top pin slots 522, each disposed in a respective bottom pin slot 524. In this example, one analog signal pin 526 (specifically, analog signal pin 526a) is a U-shaped pin that occupies two adjacent top pin slots. This U-shaped geometry can be seen in more detail in FIG. 16 . In contrast to analog signal pins 526, which are uniformly offset from top wall 510 via top pin slots 522, digital signal pins 528 are variably offset from oval perimeter 508 by aligned bottom pin slots 524 of multiple depths. As shown in Figures 15A and 15B, digital signal pins 528a and 528d are recessed in shallow pin slots, while digital signal pins 528b and 528c are recessed in relatively deep pin slots.

[0085] 15A and 15B show notches 512 and 514 as angled (specifically, right-angled) recesses into oval perimeter 508. More generally, notch 512 is a feature within the form factor defined by oval perimeter 508 that mates with a corresponding receptacle shelf (see FIGS. 18-24, described below) to hold and align plug 500. Similarly, keyway 516 is a slot through the bottom of plug 500 between digital signal pins 528b and 528c, both of which align plug 500 and gently lock it into place upon installation. Specifically, keyway 516 includes snap slot 530 (shown in FIG. 15B), which is a laterally widened axial portion within keyway 516 and is arranged to receive a spring-deformable mating receptacle component to prevent inadvertent removal of plug 500 from a mated receptacle.

[0086] The particular shape of plug 500 distributes multiple analog signal pins 526 and digital signal pins 528 across a small form factor while ensuring proper alignment of both sets of pins with corresponding electrical contacts, holding plug 500 in its installed position. As described below, the outer form factor of plug 500 matches the interior geometry of receptacle (612; see, e.g., FIG. 18 ).

[0087] Figures 16 and 17 are perspective views of connector plug 500, showing the internal components of the connector plug. Figure 16 shows the internal wires, pins, and wire guides of plug 500, while Figure 17 shows the positioning of the modular plug around these internal components to define its form factor.

[0088] 16 shows connector cable 40 including analog signal conductors 404 and digital signal conductors 406 as described above, as well as analog signal pin 526 and digital signal pin 528. In addition, FIG. 16 shows pin U-turn portion 532, wire guide 534 (including conductor slot 536), and pin teeth 538.

[0089] As previously noted, in some embodiments, one or more pins may be collocated within multiple pin slots. Pin U-turn portion 532 is an exemplary turn on analog signal pin 526a that is disposed within multiple slots for contacting one or more corresponding contacts on a mating receptacle. While only one pin U-turn portion is shown and pin U-turn portion 532 is the only illustrated example of a pin disposed within multiple slots, other embodiments may include any number of multi-slot pins appropriate for the anticipated number of electrical contacts.

[0090] Wire guide 534 is a support structure that separates and holds analog signal conductors 404 and digital signal conductors 406. More specifically, as shown in FIG. 16 , wire guide 534 includes a plurality of conductor slots 536, one slot for each conductor. Wire guide 534 is disposed between analog signal conductors 404 and digital signal conductors 406, with analog signal conductors 404 being held in conductor slots 536 in the top surface of wire guide 534 (relative to the orientation in FIG. 16 ) and digital signal conductors 406 being held in conductor slots 536 in the bottom surface of wire guide 534. Conductor slots 536 not only receive and hold signal conductors 404, 406, but also serve to position signal conductors 404, 406 relative to digital signal pins 528 and analog signal pins 526 and top pin slots 522 and bottom pin slots 524. Each analog signal pin 526 or digital signal pin 528 has a plurality of pin teeth 538 that capture and electrically contact one signal conductor 404, 406. The pin teeth 538 are embedded in and held within the conductor slots 536, thereby securing the distal ends of all analog signal conductors 404 and digital signal conductors 406 within the plug 500.

[0091] FIG. 17 provides a perspective view of a modular plug 540 enclosing wire guide 534 (not shown in FIG. 17 ) and the other illustrated elements generally described above. Modular plug 540 is a protective cover that defines the previously described outline of plug 500, which includes notches 512 and 514, keyway 516, top pin slot 522, and bottom pin slot 524. In addition, modular plug 540 includes seal ring slot 542 for receiving and accommodating seal ring 503 (shown in FIG. 14 ) and overmold slot 544 for anchoring overmold portion 502 (shown in FIG. 14 ) to plug 500. Modular plug 540 also includes receiving gaps 546 disposed between adjacent top pin slots 522 to accommodate analog signal pin 526 a and pin U-turn portion 538. The proximal end of modular plug 540 relative to DPT subassembly 26 includes connector cap 548, which is a fitting that contains the terminal end of conductor cable 40 within modular plug 540. Overall, modular plug 540 captures analog conductors 404 and digital conductors 406, prevents unwanted electrical contact with all conductors, receives and positions analog signal pins 526 and digital signal pins 528, collectively defines the retention and alignment features of plug 500 (i.e., notches 512, 514 and keyway 516), and seals the terminal end of connector cable 40. During assembly, after wire guide 534 and signal conductors 404, 406 are inserted into modular plug 540, pins 526, 528 are seated through top pin slot 522 and bottom pin slot 524, serving as an additional retention feature for modular plug 540.

[0092] Figure 18 is a perspective view of multi-signal pressure cable 20, previously introduced in Figure 2. Multi-signal pressure cable 20 includes a hybrid connector 600 adapted to receive plug 500. An analog signal cable 602 connects hybrid connector 600 to an analog signal connector 604, and a digital signal cable 606 connects hybrid connector 600 to a digital signal connector 608. Hybrid connector 600 includes an outer shell 610 and a receptacle 612.

[0093] As noted above, the hybrid connector 600 includes separate contacts arranged to independently receive both the analog signal from the analog sensor 400 and the digital signal from the digital sensor 402. As shown in FIG. 18 , the hybrid connector 600 serves as a common signal input with a split output. Specifically, the analog signal connector 604 conveys the analog signal received at the hybrid connector 600 to a complementary device expecting an analog pressure signal, while the digital signal connector 608 similarly conveys the digital signal received at the hybrid connector 600 to a complementary device expecting a digital pressure signal. Because the analog signal generation and transmission and the digital signal generation and transmission are independent according to the embodiments provided herein, the multi-signal pressure cable 20 can be connected to a digital monitor (e.g., primary monitor 22, see FIG. 2 ), an analog monitor (e.g., secondary monitor 24, see FIG. 2 ), or both simultaneously. The connector types of the analog signal connector 604 and the digital signal connector 608 can have any shape suitable for mating with the expected monitoring equipment. The receptacle 612 is a plug receiver disposed at the combined distal end of both the analog signal connector 604 and the digital signal connector 608. The outer shell 610 is a protective housing, e.g., a clamshell assembly, located immediately adjacent to the receptacle 612 and between the signal connectors 604, 608 to protect the interior of the hybrid connector 600.

[0094] Figure 19 is a perspective view of the components of hybrid connector 600, including receptacle 612, substrate 614, structural anchors 616, electrical connections 618, and receptacle overmold 620. Substrate 614, structural anchors 616, and electrical connections 618 are internal components of hybrid connector 600 that are surrounded and protected by outer shell 610 (see Figure 18). Figures 20A and 20B are perspective and front views, respectively, of receptacle 612 of hybrid connector 600. Figures 19, 20A, and 20B will be described together.

[0095] Receptacle 612 is configured to receive plug 500, as noted above and described in more detail below with reference to Figures 25A and 25B. Electrical connections 618 extending to analog signal connector 604 and digital signal connector 608 are fitted within and / or attached to substrate 614. Substrate 614 is securely connected to receptacle 612 via at least one structural anchor 616, as described in more detail below with reference to Figure 24. Structural anchor 616 may be an extension of a separate connector or another element of receptacle 612, as described below.

[0096] The receptacle 612 includes a receptacle overmold portion 620 that surrounds an oval socket 622. The oval socket 622 is a rigid structural component that defines the interior shape of the receptacle 612, sized and shaped to receive the plug 500. Specifically, the oval socket 622 includes retention and alignment features that align with complementary features on the plug 500, including a shelf 628 that aligns with the notches 512 and 514 and a snap key 630 that is received via a snap fit within the keyway 516. The overall interior shape of the oval socket 622 has a substantially oval cross-section that generally matches the oval perimeter 508 of the plug 500 to snugly receive the plug 500. In the example shown in FIG. 20A , the shelf 628 is a separate platform on a common plane that is generally parallel to and near the long axis of the oval cross-section of the oval socket 622. More generally, shelf 628 is a geometric key that matches a corresponding shape of an alignment and retention feature of plug 500, such as notches 512 and 514. As shown in FIG. 20B, snap key 630 is a protrusion that extends axially along the bottom (relative to the viewing angle of FIGS. 20A and 20B) and has an enlarged cross-section that is internal to ovular socket 622 and compresses slightly to snap fit into snap slot 530 (see FIG. 15B above) of keyway 516. As shown in FIGS. 20A and 20B, the exterior cross-section of ovular socket 622 is circular in contrast to its ovular interior cross-section.

[0097] Analog signal contacts 624 and digital signal contacts 626 are electrical contacts that extend through the interior oval wall of oval socket 622 via contact openings 631 to engage analog signal pins 526 and digital signal pins 528, respectively. The number and location of analog signal contacts 624 and digital signal contacts 626 can match the number and location of analog signal pins 526 and digital signal pins 528, respectively. Alternatively, the number of contacts may be varied to match multiple contacts to a complex pin, such as analog signal pin 526a having a U-shaped geometry, as shown in FIG. 20B . Analog signal contacts 624 and digital signal contacts 626 are further illustrated and described below.

[0098] Receptacle overmold portion 620 is a flexible or deformable cover that surrounds and protects ovular socket 622. Receptacle overmold portion 620, in some examples, can form a seal against fluid ingress into the electrical components of hybrid connector 600. The receptacle overmold portion can have a rounded or chamfered cylindrical shape, or a tapered or frustoconical shape, as shown in FIGS. 20A and 20B , and surrounds but is offset from the center of the ovular internal cavity defined by ovular socket 622.

[0099] Figures 21, 22A, 22B, 23, and 24 are cutaway or peeled-away perspective views of hybrid connector 600 showing the internal components. Figure 21 shows the parts generally described above with respect to Figures 19, 20A, and 20B, but omits overmolded portion 620 to expose additional portions of ovular socket 622, including structural receptacle 632 and receptacle face 634. As shown in Figure 21, structural anchor 616 can be an integral plate or extension of ovular socket 622 that extends parallel to and abuts substrate 614. In contrast to the smoothly tapered interior geometry of the oval socket adapted to receive the plug 500, the exterior of the oval socket 622 may include ridges, flanges, and notches arranged to anchor the receptacle overmold portion 620 to the oval socket 622 and prevent rotation of the receptacle overmold portion 620, as shown in FIG. 21 .

[0100] 22A and 22B show the components of the receptacle 612 substantially as described above with reference to FIG. 21 , but omit the overmold portion 620 to expose the contact support 636 having a contact support body 638 and a contact support arm 640. FIG. 23 further omits the contact support 636 to show the shape and internal location of the analog and digital signal contacts 624 and 626, including when the analog and digital signal contacts 624 and 626 contact the substrate 614 via the electrical connections 618. The contact support 636 is a rigid structure that is housed within the oval socket 622 and outer shell 610 and is configured to separate, position, and support the analog and digital signal contacts 624 and 626. The contact support 636 includes a contact support body that is positioned between the substrate 614 and the rear wall of the interior chamber of the oval socket 622. The contact support 636 also includes a plurality of contact support arms 640 that extend distally away from the contact support body 638 and act as shelves that engage the analog signal contacts 624 and the digital signal contacts 626. In the illustrated example, the contact support arms 640 are received within upper and lower (relative to the orientation in FIGS. 20A and 20B ) spaces defined between the inner wall of the oval socket 622, which has an oval cross-section, and the generally cylindrical outer wall of the oval socket 622. More specifically, as best seen in FIG. 22B , the contact support 636 includes one contact support arm 640 that abuts the row of analog signal contacts at a predetermined position to engage the row of analog signal contacts with the analog signal pins 526, and two separate contact support arms 640 that support sets of digital signal contacts 626 disposed on either side of the snap key 630.

[0101] 23 , both the analog signal contacts 624 and the digital signal contacts 626 are attached to the substrate 614 via electrical connections 618. Each analog signal contact 624 includes an electrical contact portion 644 and an axial portion 642 that are bent inward and backward toward the digital signal contacts 626 and the substrate 614. Similarly, each digital signal contact 626 includes an electrical contact portion 648 and an axial portion 646 that are bent inward and backward toward the analog signal contact 624 and the substrate 614. This arrangement spring-loads the electrical contact portions 644 and 648 of the analog signal contacts 624 and the digital signal contacts 626, respectively, into engagement with the pins of the plug 500.

[0102] FIG. 24 provides a further cross-sectional view of elements of receptacle 612 in a plane disposed between analog signal contacts 624 and digital signal contacts 626. FIG. 24 shows oval-shaped socket 622 having structural receptacle 632, as previously described, cylindrically surrounding digital signal contacts 626 and snap key 630. Oval-shaped socket 622 also includes receptacle face 634 and overmolded retention flange 650. Overmolded retention flange 650 forms an anchor for receptacle overmolded portion 620 (not shown; see FIGS. 19-21 ). In some examples, receptacle face 634 can extend distally beyond the axial extent of receptacle overmolded portion 620, while in other examples, receptacle face 634 can be at least partially captured within receptacle overmolded portion 620. As shown in Figure 24, the ovular socket 622 includes two separate integral structural anchors 616 that are fastened to the substrate 614 (see Figure 21). More generally, any number or shape of structural anchors 616 can be used to securely attach the ovular socket 622, and thereby the contact carrier 634 and analog and digital signal contacts 624, 626, to the substrate 614. Figure 24 shows a snap engagement 652 between the contact carrier 636 and the ovular socket 622, which holds the contact carrier 636 against the rear wall of the ovular socket 622.

[0103] 25A and 25B are simplified perspective and cross-sectional views, respectively, of plug 500 mating with hybrid connector 600. Once mated as described above, plug 500 is inserted into oval socket 622, thereby electrically contacting analog signal pins 526 with analog signal contacts 624 and digital signal pins 528 with digital signal contacts 626. Snap keys 630 snap-fit ​​into keyways 516, oval perimeter 508 of plug 500 smoothly abuts the inner surface of oval socket 622, and shroud 504 overlaps receptacle overmold portion 620 to form a durable, fluid-tight connection. The row of electrical contact portions 644 of the analog signal contact 624 engages the analog signal pin 526 from above, while the row of electrical contact portions 648 of the digital signal contact 626 engages the digital signal pin 528 from below, thereby allowing differential pressure signals from both the analog sensor 400 and the digital sensor 402 to be received and transmitted to the analog signal connector 604 and the digital signal connector 608, respectively, and from the analog signal connector 604 and the digital signal connector 608 to an appropriate patient monitor expecting digital and / or analog pressure signals.

[0104] While the present invention has been described with reference to exemplary embodiments, it will be recognized by those skilled in the art that various modifications may be made and various equivalents may be substituted for elements of the embodiments without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but will include all embodiments within the scope of the appended claims.

[0105] Description of Possible Embodiments The following is a non-exclusive description of possible embodiments of the present invention.

[0106] 1. A dual differential pressure transducer assembly, comprising: an intravenous (IV) fluid inlet configured to receive fluid from an IV bag; an IV fluid outlet configured to supply fluid to a patient IV needle; a flow path element defining a fluid channel connecting the IV fluid inlet to the IV fluid outlet, the fluid channel defining a centerline axis of the dual differential pressure transducer assembly; a first sensor cavity disposed alongside the fluid channel and fluidly connected to the fluid channel via a first cutout through the flow path element, the first cutout extending transverse to the centerline axis; and a second sensor cavity disposed alongside the fluid channel and parallel to the first sensor cavity and through the flow path element. a second sensor cavity fluidly connected to the fluid channel through a notch, the second notch extending transversely to the centerline axis and axially aligned with but angularly offset from the first notch relative to the centerline axis; a first differential pressure sensor abutting the first sensor cavity and having a first sensor face exposed to the fluid channel through the first notch; a second differential pressure sensor abutting the second sensor cavity and having a second sensor face exposed to the fluid channel through the second notch; and separate signal conductors connected to the first and second differential pressure sensors, respectively.

[0107] The dual differential pressure transducer assembly of the preceding paragraph may optionally additionally and / or alternatively include any one or more of the following features, configurations, and / or additional components.

[0108] A further embodiment of the above dual differential pressure transducer assembly, wherein the separate signal conductors comprise a first plurality of signal conductors arranged to carry analog electrical signals from the first differential pressure sensor and a second plurality of signal conductors arranged to carry digital signals from the second differential pressure sensor, the first plurality of signal conductors and the second plurality of signal conductors being disposed side by side with the first and second sensors in a common plane and enclosed with the first and second differential pressure sensors within a common housing.

[0109] A further embodiment of the dual differential pressure transducer assembly described above, wherein a common housing surrounds the first differential pressure sensor, the second differential pressure sensor, and at least a portion of the fluid channel aligned with the first notch and the second notch.

[0110] A further embodiment of the above dual differential pressure transducer assembly, wherein the first notch and the second notch are separated by an angle less than 180° relative to the centerline axis.

[0111] A further embodiment of the above dual differential pressure transducer assembly, wherein the first notch and the second notch are separated by an angle greater than 90° relative to the centerline axis.

[0112] A further embodiment of the dual differential pressure transducer assembly described above, wherein the fluid channel has a diameter of 1 mm to 8 mm at the axial location of the first notch and the second notch.

[0113] A further embodiment of the dual differential pressure transducer assembly described above, wherein a cross-sectional area of ​​the fluid channel through a plane perpendicular to the centerline axis is narrowest at a location upstream of the first notch and the second notch.

[0114] A further embodiment of the dual differential pressure transducer assembly described above, wherein the first notch and the second notch intersect with the fluid channel at the first channel opening and the second channel opening.

[0115] A further embodiment of the above dual differential pressure transducer assembly, wherein the first channel opening and the second channel opening each subtend an angle relative to the centerline axis of less than 5°.

[0116] A further embodiment of the dual differential pressure transducer assembly described above, wherein the first notch and the second notch each extend from their narrowest portions at the first and second channel openings, respectively, to their widest portions at the first and second sensor faces, respectively, depending on their radial position relative to the centerline axis.

[0117] A further embodiment of the dual differential pressure transducer assembly described above, wherein the first notch and the second notch are each defined in part by a wall extending from the fluid channel to the first differential pressure sensor and the second differential pressure sensor, respectively, the walls being parallel to each other and to the centerline axis but offset from each other and to the centerline axis.

[0118] A further embodiment of the above dual differential pressure transducer assembly, wherein the first channel opening and the second channel opening are elongated openings having a major dimension parallel to the centerline axis.

[0119] A further embodiment of the above dual differential pressure transducer assembly, wherein the first channel opening and the second channel opening each have a circumferential width relative to the centerline axis that is greater than 0.005 inches (0.133 mm).

[0120] A further embodiment of the above dual differential pressure transducer assembly, wherein the first channel opening and the second channel opening each have a circumferential width relative to the centerline axis that is less than 25% of the entire circumference of the channel at the location of the first channel opening and the second channel opening.

[0121] A further embodiment of the dual differential pressure transducer assembly described above, wherein the first channel opening and the second channel opening each have an axial length relative to the centerline axis that is at least 0.005 inches and is less than the axial extent of the sealing faces of the first differential pressure sensor and the second differential pressure sensor.

[0122] A further embodiment of the above dual differential pressure transducer assembly, wherein the first channel opening and the second channel opening each have an axial length relative to the centerline axis of between 0.07 inches and 0.08 inches.

[0123] A further embodiment of the above dual differential pressure transducer assembly, wherein at least one of the first sensor surface and the second sensor surface is defined by a flexible gel diaphragm.

[0124] A further embodiment of the above dual differential pressure transducer assembly, further comprising a stopcock disposed along the fluid channel downstream of the first notch and the second notch, the stopcock being actuable between a plurality of valve states including a first state fluidly isolating the IV fluid inlet from the IV fluid outlet and a second state fluidly connecting the IV fluid inlet to the IV fluid outlet.

[0125] A further embodiment of the above dual differential pressure transducer assembly, wherein the stopcock is a three-way valve.

[0126] A further embodiment of the dual differential pressure transducer assembly described above, further comprising a flush tab disposed alongside a wall within the fluid channel to selectively permit flow from upstream to downstream over the wall and through the fluid channel.

[0127] A further embodiment of the dual differential pressure transducer assembly described above, wherein the flush tab is disposed upstream of the first notch and the second notch.

[0128] A further embodiment of the dual differential pressure transducer assembly described above, wherein the dual differential pressure transducer assembly is sterilized.

[0129] A further embodiment of the dual differential pressure transducer assembly described above, further comprising a connector cable terminating in a connector plug and enclosing separate signal conductors from the first and second differential pressure sensors to the connector plug.

[0130] A further embodiment of the above dual differential pressure transducer assembly, wherein the connector plug comprises a plug body arranged for insertion into a receiving receptacle, a first plurality of pins electrically connected to a first differential pressure sensor via a first subset of distinct signal conductors, and a second plurality of pins electrically connected to a second differential pressure sensor via a second subset of distinct signal conductors distinct from the first subset of distinct signal conductors, the first and second pluralities of pins being disposed on opposite sides of the plug body.

[0131] A differential pressure transducer assembly comprising: an intravenous (IV) fluid channel; a first differential pressure sensor disposed to generate a first sensor signal indicative of fluid flow through the IV fluid channel; a first plurality of signal conductors electrically connected to the first differential pressure sensor for carrying the first sensor signal; a second differential pressure sensor disposed to generate a second sensor signal indicative of fluid flow through the IV fluid channel, the second sensor signal being different from the first sensor signal; a second plurality of signal conductors electrically connected to the second differential pressure sensor for carrying the second sensor signal; a connector cable extending from a first differential pressure sensor and a second differential pressure sensor and including a first plurality of signal conductors and a second plurality of signal conductors; and a connector plug terminating the connector cable and defining a plug axis, the connector plug comprising: a first plurality of pins electrically connected to the first plurality of signal conductors and a second plurality of pins electrically connected to the second plurality of signal conductors; and a wire guide separating the first plurality of signal conductors from the second plurality of signal conductors in the connector plug and holding and guiding the first plurality of signal conductors and the second plurality of signal conductors to the first plurality of pins and the second plurality of pins, respectively.

[0132] The differential pressure transducer assembly of the preceding paragraph may optionally and / or alternatively include any one or more of the following features, configurations, and / or additional components.

[0133] A further embodiment of the above differential pressure transducer assembly, wherein the first differential pressure sensor and the second differential pressure sensor are an analog sensor and a digital sensor, respectively, whereby the first sensor signal is an analog signal and the second sensor signal is a digital signal.

[0134] A further embodiment of the above differential pressure transducer assembly, further comprising a substantially cylindrical or frusto-conical shroud disposed coaxially around the connector plug and about the plug axis.

[0135] A further embodiment of the above differential pressure transducer assembly, further comprising a grip secured to the connector cable and the shroud.

[0136] A further embodiment of the above differential pressure transducer assembly, wherein the grip is a resilient overmolded portion.

[0137] A further embodiment of the above differential pressure transducer assembly, wherein the connector plug further comprises a modular plug that surrounds and captures the wire guide while exposing both the first plurality of pins and the second plurality of pins.

[0138] A further embodiment of the above differential pressure transducer assembly, wherein the first plurality of pins and the second plurality of pins are disposed on opposite sides of the modular plug.

[0139] A further embodiment of the above differential pressure transducer assembly, wherein all of the first plurality of pins and the second plurality of pins are insertable into the wire guide through a modular plug to form electrical connections with the first plurality of pins and the second plurality of pins, respectively.

[0140] A further embodiment of the above differential pressure transducer assembly, wherein the modular plug has an oval or elliptical cross-section through at least one cross-section in a plane orthogonal to the plug axis, the oval or elliptical cross-section being defined by a major axis, whereby opposing first and second portions of the modular plug are separated by the major axis of the oval or elliptical cross-section.

[0141] A further embodiment of the above differential pressure transducer assembly, further comprising a fluid-tight element disposed about the modular plug.

[0142] A further embodiment of the differential pressure transducer assembly described above, wherein the modular plug includes a plurality of alignment features configured to prevent misalignment of the connector plug with an improper receptacle or misalignment of the connector plug at a non-functional angle.

[0143] A further embodiment of the above differential pressure transducer assembly, wherein the alignment feature comprises an angled notch from the periphery of the modular plug, the angled notch being defined by a surface substantially parallel to the plug axis.

[0144] A further embodiment of the differential pressure transducer assembly described above, wherein there are two angled cutouts, the angled cutouts being located generally within the first portion and defined in part by parallel surfaces symmetrically surrounding the central portion of the modular plug.

[0145] A further embodiment of the above differential pressure transducer assembly, wherein the alignment feature further comprises a keyway in the second portion that is symmetrically disposed relative to the two angled notches.

[0146] A further embodiment of the above differential pressure transducer assembly, wherein the keyway extends axially across a subset of the axial length of the modular plug and expands to a maximum width near an axially central position of the subset of the axial length.

[0147] A further embodiment of the above differential pressure transducer assembly, wherein the first plurality of pins are disposed within and exposed through a first portion of the modular plug, and the second plurality of pins are disposed within and exposed through a second portion of the modular plug.

[0148] A further embodiment of the above differential pressure transducer assembly, wherein the first plurality of pins and the second plurality of pins are exposed axially and laterally through the modular plug.

[0149] A further embodiment of the above differential pressure transducer assembly, wherein each of the first and second plurality of pins electrically contacts only one of the first and second plurality of signal conductors, respectively.

[0150] A further embodiment of the above differential pressure transducer assembly, wherein at least one of the first plurality of pins is a U-shaped double pin.

[0151] A further embodiment of the above differential pressure transducer assembly, wherein the first plurality of signal conductors and the second plurality of signal conductors are equal in number.

[0152] A further embodiment of the above differential pressure transducer assembly, wherein at least one of each of the first plurality of signal conductors and the second plurality of signal conductors corresponds to ground.

[0153] A sensor signal connector configured to separately transmit sensor signals from a first sensor and a second sensor, the sensor signal connector comprising: a first plurality of signal conductors electrically connected to the first sensor; a second plurality of signal conductors electrically connected to the second sensor; a connector cable surrounding the first plurality of signal conductors and the second plurality of signal conductors; and a wire guide disposed at an end of the connector cable and having a first side and a second side opposite each other, the wire guide holding exposed ends of the first plurality of signal conductors at connection positions on the first side and a second side. a wire guide arranged to hold exposed ends of a second plurality of signal conductors at a portion of the first plurality of signal conductors; a plurality of pins secured within the wire guide, each pin attached to one of the first plurality of signal conductors or the second plurality of signal conductors; and a modular plug defining an outer form factor of the sensor signal connector securable within a sensor receptacle, the modular plug surrounding the wire guide, securing the first plurality of signal conductors and the second plurality of signal conductors to the wire guide, and exposing the plurality of pins.

[0154] The sensor signal connector of the preceding paragraph may optionally and / or alternatively include any one or more of the following features, configurations, and / or additional components.

[0155] A further embodiment of the sensor signal connector described above, wherein each of the plurality of pins has a chamfered or beveled edge furthest from the wire guide.

[0156] A further embodiment of the sensor signal connector described above, wherein at least one of the first plurality of signal conductors and the second plurality of signal conductors corresponds to ground.

[0157] A further embodiment of the above sensor signal connector, wherein the wire guide and connector cable are formed from an insulating material and the plurality of pins are formed from a conductive material.

[0158] A further embodiment of the sensor signal connector described above, wherein all of the first plurality of signal conductors and the second plurality of signal conductors are disposed within a plane within the connector cable.

[0159] A further embodiment of the sensor signal connector described above, wherein the wire guides separate and align the first plurality of signal conductors in a first plane on the first side and separate and align the second plurality of signal conductors in a second plane on the second side.

[0160] A further embodiment of the sensor signal connector described above, wherein the plurality of pins includes a first plurality of pins contacting a first plurality of signal conductors and extending away from the first side, and a second plurality of pins contacting a second plurality of signal conductors and extending away from the second side and the first plurality of pins.

[0161] A further embodiment of the above sensor signal connector, further comprising a cylindrical or frusto-conical shroud extending from the connector cable and surrounding the modular plug.

[0162] A further embodiment of the sensor signal connector described above, further comprising a resilient grip that abuts the connector cable, the shroud, and the wire guide.

[0163] A further embodiment of the sensor signal connector described above, wherein the modular plug includes a plurality of alignment features configured to prevent misalignment of the connector plug with an improper receptacle or misalignment of the connector plug at a non-functional angle.

[0164] A further embodiment of the above sensor signal connector, wherein the alignment feature comprises an inwardly flared keyway on the distal end of the modular plug.

[0165] A further embodiment of the sensor signal connector described above, wherein the modular plug includes an angled notch.

[0166] A further embodiment of the above sensor signal connector, wherein the modular plug has an oval or elliptical cross-section in at least one position, the oval or elliptical cross-section having a major axis parallel to the first plane and the second plane.

[0167] A further embodiment of the above sensor signal connector, wherein the major axis is at most 0.5 inches wide.

[0168] A further embodiment of the above sensor signal connector, wherein the oval cross-section of the modular plug is further defined by a minor axis perpendicular to the major axis, the minor axis having a width of at most 0.37 inches.

[0169] A further embodiment of the sensor signal connector described above, wherein the plurality of pins consists of eight pins, and each of the eight pins is electrically connected to only one signal conductor of the first plurality of signal conductors and the second plurality of signal conductors.

[0170] A further embodiment of the sensor signal connector described above, wherein one of the plurality of pins is a U-shaped double pin.

[0171] A further embodiment of the above sensor signal connector, wherein the modular plug exposes a plurality of pins through a plurality of slots, each slot aligned with one of the plurality of pins.

[0172] 1. A multifunction signal connector configured to receive both analog and digital sensor signals, the multifunction signal connector comprising: an oval-shaped socket disposed about a receptacle and defining a receptacle space; a rigid contact support disposed within the oval-shaped socket, the rigid contact support including a top shelf and a bottom shelf; a first plurality of electrical contacts disposed along the top shelf and angled from the top shelf toward the bottom shelf; and a second plurality of electrical contacts disposed along the bottom shelf and angled from the bottom shelf toward the top shelf.

[0173] The multi-function signal connector of the preceding paragraph may optionally and / or alternatively include any one or more of the following features, configurations, and / or additional components:

[0174] A further embodiment of the above multi-function signal connector, wherein the oval socket is attached to the rigid contact support via a snap connection.

[0175] A further embodiment of the above multi-function signal connector, wherein a first plurality of electrical contacts are configured to receive analog signals and are routed to an analog signal output, while a second plurality of electrical contacts are configured to receive digital signals and are routed to a digital signal output.

[0176] A further embodiment of the above multi-function signal connector, further comprising a substantially cylindrical or frusto-conical resilient outer shell surrounding the oval socket.

[0177] A further embodiment of the above multi-function signal connector, wherein the oval socket has a substantially circular outer cross-section and a substantially oval or elliptical inner cross-section.

[0178] A further embodiment of the above multi-function signal connector, wherein the oval socket includes a plurality of alignment features.

[0179] A further embodiment of the above multi-function signal connector, wherein the alignment features comprise alignment shelves at substantially opposite ends of the receptacle space.

[0180] A further embodiment of the above multi-function signal connector, wherein the alignment features further comprise snap keys symmetrically disposed between the alignment shelves.

[0181] A further embodiment of the above multi-function signal connector, wherein the snap key separates a subset of the second plurality of electrical contacts from the remainder of the second plurality of electrical contacts.

[0182] A further embodiment of the above multi-function signal connector, wherein the snap key comprises an expanded portion of resilient material.

[0183] A further embodiment of the above multi-function signal connector, wherein the oval socket is formed entirely of an elastic material.

[0184] A further embodiment of the above multi-function signal connector, further comprising a common substrate to which both the first plurality of electrical contacts and the second plurality of electrical contacts are anchored.

[0185] A further embodiment of the above multi-function signal connector, wherein the first plurality of electrical contacts are anchored opposite the second plurality of electrical contacts in the common substrate.

[0186] A further embodiment of the above multi-function signal connector, wherein the first plurality of electrical contacts and the second plurality of electrical contacts are spring loaded.

[0187] A differential pressure transducer assembly, comprising: a flow path element, the flow path element including: channel walls defining a fluid channel connecting a fluid inlet to a fluid outlet and defining a centerline axis of the differential pressure transducer assembly; side plates extending perpendicularly outward from opposite sides of the channel walls; a plurality of protrusions cantilevered from the side plates, each protrusion of the plurality of protrusions extending perpendicularly to the side plates; a beam extending parallel to a beam axis; a barb disposed at a distal end of the beam; and a structural housing, the structural housing including a base and a base. a structural housing comprising: a sidewall extending from the side plate and defining a recess conforming to an outer periphery of the side plate; and a plurality of receptacles adapted to receive respective protrusions of the plurality of protrusions, each receptacle of the plurality of receptacles comprising a pocket open along a beam axis and an undercut extending from the pocket into the structural housing perpendicular to the beam axis, wherein each protrusion of the plurality of protrusions is insertable into a respective receptacle along the beam axis.

[0188] The differential pressure transducer assembly of the preceding paragraph may optionally and / or alternatively include any one or more of the following features, configurations, and / or additional components.

[0189] A further embodiment of the above differential pressure transducer assembly, wherein the pocket of each receptacle is disposed inside the side wall.

[0190] A further embodiment of the above differential pressure transducer assembly, wherein the undercut of each receptacle extends outwardly within the base relative to the centerline axis and below the sidewall.

[0191] A further embodiment of the above differential pressure transducer assembly, wherein each receptacle of the plurality of receptacles includes an opening extending through a first surface of the base and intersecting with the undercut of the respective receptacle, and the sidewall extends from a second surface of the base opposite the first surface.

[0192] A further embodiment of the above differential pressure transducer assembly, wherein a pocket in each receptacle receives a beam of a respective prong, and an undercut in each receptacle receives a barb of a respective prong through the pocket.

[0193] A further embodiment of the above differential pressure transducer assembly, wherein the barb of each projection includes a lip surface extending perpendicularly from the beam, the lip surface facing the retaining surface of the undercut of each receptacle.

[0194] A further embodiment of the above differential pressure transducer assembly, wherein the barb of each projection includes a tapered surface oblique to the beam axis.

[0195] A further embodiment of the above differential pressure transducer assembly, wherein the structural housing further comprises a plurality of shelf surfaces formed by the side walls, each shelf surface being oblique to the beam axis and oriented to abut against a respective tapered surface of the plurality of protrusions during assembly of the flow path element to the structural housing.

[0196] A further embodiment of the above differential pressure transducer assembly, wherein each shelf surface of the plurality of shelf surfaces is positioned at a distal end of a sidewall opposite the base.

[0197] A further embodiment of the above differential pressure transducer assembly, wherein each shelf surface of the plurality of shelf surfaces is positioned at a distal end of a sidewall opposite the base.

[0198] A further embodiment of the above differential pressure transducer assembly, wherein each barb of the plurality of projections faces outward relative to the centerline axis of the flow path element, and each pocket of the plurality of receptacles is inward of the sidewall.

[0199] A further embodiment of the differential pressure transducer assembly described above, wherein at least one protrusion of the plurality of protrusions includes a rib extending along a first surface of the beam, and a barb extending from a second surface of the beam opposite the first surface of the beam.

[0200] A further embodiment of the above differential pressure transducer assembly, wherein the plurality of protrusions includes a first protrusion and a second protrusion, and each of the first protrusion and the second protrusion includes a first rib extending from the side plate to a distal end of the respective beam.

[0201] A further embodiment of the above differential pressure transducer assembly, wherein the plurality of protrusions includes a third protrusion and a fourth protrusion, and each of the third protrusion and the fourth protrusion includes a second rib extending from the side plate and terminating between the side plate and the distal tip of the respective beam.

[0202] A further embodiment of the above differential pressure transducer assembly, wherein a cross section of each pocket perpendicular to the beam axis matches a cross section of the respective beam and rib perpendicular to the beam axis.

[0203] A further embodiment of the above differential pressure transducer assembly, further comprising: a sensor housed within a cavity defined by the flow path element; and a connector cable extending along the centerline axis between the flow path element and the structural housing, the connector cable comprising a plurality of conductors electrically connecting the connector cable to the sensor; and a protective cover surrounding the plurality of conductors.

[0204] A further embodiment of the above differential pressure transducer assembly, wherein the flow path element includes a cable pedestal extending from the channel wall parallel to the beam axis and engaging a protective cover for the connector cable.

[0205] A further embodiment of the above differential pressure transducer assembly, wherein the structural housing is formed by the base and includes a saddle that engages a protective cover for the connector cable.

[0206] A further embodiment of the above differential pressure transducer assembly, wherein the cable pedestal includes an end face that mates with the protective cover of the connector cable.

[0207] A further embodiment of the differential pressure transducer assembly described above, wherein the saddle is matched with a protective cover for the connector cable.

[0208] A further embodiment of the differential pressure transducer assembly described above, wherein the cable pedestal and saddle interfere with the protective cover of the connector cable, whereby the protective cover of the connector cable urges the flow path element toward the structural housing to engage the abutting surfaces of the barb and the undercut.

[0209] A further embodiment of the above differential pressure transducer assembly, wherein the cable pedestal is disposed between two of the plurality of protrusions and the saddle is disposed between two of the plurality of receptacles.

[0210] A differential pressure transducer assembly comprising: a flow path element having a channel wall defining a fluid channel connecting a flow path inlet to a fluid outlet, the fluid channel defining a centerline axis of the differential pressure transducer assembly; a stopcock comprising a cylindrical body and a first semi-annular collar segment forming a first sector of the cylindrical body; a structural housing mated with and supporting the flow path element; a front cover mated with a rear cover and cooperating with the rear cover to enclose the structural housing and the flow path element; and a stopcock having a stopcock and a front cover. a pair of cantilevered supports extending from the rear cover or the back cover and resiliently engaging the structural housing to bias the structural housing and the flow path element into engagement with the stopcock; and a support pedestal extending from the back cover and defining a semi-cylindrical channel and a first retention slot, wherein the semi-cylindrical channel receives the flow path element and the stopcock, the first retention slot receives a first semi-annular rib, and abutting surfaces of the first semi-annular rib and the first retention slot press against each other to restrain the stopcock, the flow path element, and the structural housing against the pair of cantilevered supports.

[0211] The differential pressure transducer of the preceding paragraph may optionally and / or alternatively include any one or more of the following features, configurations, and / or additional components.

[0212] A further embodiment of the above differential pressure transducer, wherein the pair of cantilevered supports includes a pair of longitudinal ribs, each longitudinal rib extending along one of the cantilevered supports opposite the structural housing.

[0213] A further embodiment of the above differential pressure transducer, wherein the cross-sectional area of ​​the pair of longitudinal ribs decreases towards the free ends of the pair of longitudinal ribs.

[0214] A further embodiment of the above differential pressure transducer, wherein the cross-sectional area of ​​the pair of longitudinal ribs decreases linearly towards the free ends of the pair of longitudinal ribs.

[0215] A further embodiment of the above differential pressure transducer, wherein the pair of cantilevered supports includes a pair of side gussets, each side gusset extending from one of the cantilevered supports to the front cover or the rear cover.

[0216] A further embodiment of the above differential pressure transducer, wherein the first retention slot of the pedestal is semi-annular, and circumferentially abutting surfaces of the first retention slot and the semi-annular rib restrain rotation of the stopcock about the centerline axis.

[0217] A further embodiment of the above differential pressure transducer, wherein the stopcock includes a second semi-annular collar segment forming a second sector of the cylinder circumferentially spaced from the first semi-annular collar segment, the pedestal includes a second retention slot that receives the second semi-annular collar segment, and abutment surfaces of the second retention slot and the second semi-annular collar segment press and restrain the stopcock, the flow path element, and the structural housing against the pair of cantilever supports.

[0218] A further embodiment of the above differential pressure transducer, wherein the first and second retention slots of the pedestal are semi-annular, and the circumferential abutting surfaces of the first retention slot and the first semi-annular collar segment and the second retention slot and the second semi-annular collar segment resist rotation of the stopcock about the centerline axis.

[0219] A further embodiment of the above differential pressure transducer, wherein the first semi-annular collar segment is coincident with the second semi-annular collar segment along the centerline axis.

[0220] A further embodiment of the above differential pressure transducer, wherein the pair of cantilevered supports includes a pair of longitudinal ribs, each longitudinal rib extending along one of the cantilevered supports opposite the structural housing, and wherein the first retention slot of the pedestal is semi-annular, and wherein circumferentially abutting surfaces of the first retention slot and the semi-annular collar segment resist rotation of the stopcock about the centerline axis.

[0221] A further embodiment of the above differential pressure transducer, wherein the stopcock includes a second semi-annular collar segment forming a second sector of the cylinder circumferentially spaced from the first semi-annular collar segment, the pedestal includes a second retention slot that receives the second semi-annular collar segment, and abutment surfaces of the second retention slot and the second semi-annular collar segment press and restrain the stopcock, the flow path element, and the structural housing against the pair of cantilever supports.

[0222] A further embodiment of the above differential pressure transducer, wherein the first and second retention slots of the pedestal are semi-annular, and the circumferential abutting surfaces of the first retention slot and the first semi-annular collar segment and the second retention slot and the second semi-annular collar segment resist rotation of the stopcock about the centerline axis.

[0223] A further embodiment of the above differential pressure transducer, wherein the first semi-annular collar segment is coincident with the second semi-annular collar segment along the centerline axis.

[0224] A further embodiment of the above differential pressure transducer, wherein the structural housing includes a snap slot and the rear cover includes a snap fitting with a plurality of barbed flanges, the barbed flanges engaging the snap slots to restrain the structural housing in a first direction perpendicular to the base and to allow sliding movement of the structural housing relative to the rear cover in a second direction parallel to the centerline axis.

[0225] a plurality of protrusions cantilevered from the side plates, each protrusion of the plurality of protrusions extending perpendicularly from the side plates and comprising a beam extending parallel to a beam axis and a barb disposed at a distal end of the beam; and a structural housing, the structural housing having a base and a sidewall extending from the base and defining a recess conforming to an outer periphery of the side plates; and a plurality of receptacles adapted to receive a respective protrusion of the plurality of protrusions, each receptacle of the plurality of receptacles comprising a pocket open along the beam axis and an undercut extending from the pocket into the structural housing perpendicular to the beam axis, each protrusion of the plurality of protrusions being inserted into a respective receptacle along the beam axis. a front cover mated with the rear cover and cooperating with the rear cover to enclose the structural housing and the flow path elements; a pair of cantilevered supports extending from the front cover or the rear cover and resiliently engaging the structural housing to bias the structural housing and the flow path elements into engagement with the stopcock; and a support pedestal extending from the rear cover and defining a semi-cylindrical channel and a first retention slot, wherein the semi-cylindrical channel receives the flow path elements and the stopcock, the first retention slot receives the first semi-annular collar segment, and abutting surfaces of the first semi-annular collar segment and the first retention slot press against and restrain the stopcock, the flow path elements, and the structural housing against the pair of cantilevered supports.

[0226] The differential pressure transducer assembly of the preceding paragraph may optionally and / or alternatively include any one or more of the following features, configurations, and / or additional components.

[0227] A further embodiment of the above differential pressure transducer assembly, wherein each barb of the plurality of projections faces outward relative to the centerline axis of the flow path element, and each pocket of the plurality of receptacles is inward of the sidewall.

[0228] A further embodiment of the differential pressure transducer assembly described above, wherein at least one protrusion of the plurality of protrusions includes a rib extending along a first surface of the beam, and a barb extending from a second surface of the beam opposite the first surface of the beam.

[0229] A further embodiment of the above differential pressure transducer assembly, wherein the plurality of protrusions includes a first protrusion and a second protrusion, and each of the first protrusion and the second protrusion includes a first rib extending from the side plate to a distal end of the respective beam.

[0230] A further embodiment of the above differential pressure transducer assembly, wherein the plurality of protrusions includes a third protrusion and a fourth protrusion, and each of the third protrusion and the fourth protrusion includes a second rib extending from the side plate and terminating between the side plate and the distal tip of the respective beam.

[0231] A further embodiment of the above differential pressure transducer assembly, further comprising: a sensor housed within a cavity defined by the flow path element; and a connector cable extending along the centerline axis between the flow path element and the structural housing, the connector cable further comprising a plurality of conductors electrically connecting the connector cable to the sensor; and a protective cover surrounding the plurality of conductors.

[0232] A further embodiment of the above differential pressure transducer assembly, wherein the flow path element includes a cable pedestal extending from the channel wall parallel to the beam axis and engaging a protective cover for the connector cable, and the structural housing is formed by a base and includes a saddle engaging the protective cover for the connector cable.

[0233] A further embodiment of the differential pressure transducer assembly described above, wherein the cable pedestal and saddle interfere with the protective cover of the connector cable, whereby the protective cover of the connector cable urges the flow path element toward the structural housing and engages the abutting surfaces of the barb and the undercut.

[0234] A further embodiment of the above differential pressure transducer assembly, wherein the cable pedestal is disposed between two of the plurality of protrusions and the saddle is disposed between two of the plurality of receptacles.

[0235] A further embodiment of the above differential pressure transducer assembly, wherein the structural housing includes a snap slot and the rear cover includes a snap fitting with a plurality of barbed flanges, the barbed flanges engaging the snap slots to restrain the structural housing in a first direction perpendicular to the base and to allow sliding movement of the structural housing relative to the rear cover in a second direction parallel to the centerline axis.

[0236] A further embodiment of the above differential pressure transducer assembly, wherein the pair of cantilevered supports includes a pair of longitudinal ribs, each longitudinal rib extending along one of the cantilevered supports opposite the structural housing.

[0237] A further embodiment of the above differential pressure transducer assembly, wherein the cross-sectional area of ​​the pair of longitudinal ribs decreases towards the free ends of the pair of longitudinal ribs.

[0238] A further embodiment of the above differential pressure transducer assembly, wherein the cross-sectional area of ​​the pair of longitudinal ribs decreases linearly towards the free ends of the pair of longitudinal ribs.

[0239] A further embodiment of the above differential pressure transducer assembly, wherein the pair of cantilevered supports includes a pair of side gussets, each side gusset extending from one of the cantilevered supports to the front cover or the rear cover.

[0240] A further embodiment of the above differential pressure transducer assembly, wherein the pair of cantilevered supports includes a pair of longitudinal ribs, each longitudinal rib extending along one of the cantilevered supports opposite the structural housing, and wherein the first retention slot of the pedestal is semi-annular, and wherein circumferentially abutting surfaces of the first retention slot and the semi-annular collar segment resist rotation of the stopcock about the centerline axis.

[0241] A further embodiment of the above differential pressure transducer assembly, wherein the stopcock includes a second semi-annular collar segment forming a second sector of the cylinder circumferentially spaced from the first semi-annular collar segment, the pedestal includes a second retention slot that receives the second semi-annular collar segment, and abutting surfaces of the second retention slot and the second semi-annular collar segment press and restrain the stopcock, the flow path element, and the structural housing against the pair of cantilever supports.

[0242] A further embodiment of the above differential pressure transducer assembly, wherein the first and second retention slots of the pedestal are semi-annular, and the circumferential abutting surfaces of the first retention slot and the first semi-annular collar segment and the second retention slot and the second semi-annular collar segment resist rotation of the stopcock about the centerline axis.

[0243] A further embodiment of the above differential pressure transducer assembly, wherein the first semi-annular collar segment is coincident with the second semi-annular collar segment along the centerline axis.

[0244] Any relative terms or terms of degree used herein, such as "substantially," "essentially," "generally," "approximately," etc., should be construed in accordance with and dependent upon any applicable definitions or limitations expressly set forth herein. In all instances, any relative terms or terms of degree used herein should be construed broadly to encompass any suitable disclosed embodiments, and such ranges or variations will be understood by those skilled in the art in view of the entirety of this disclosure to encompass, for example, normal manufacturing tolerance variations, accidental alignment variations, variations in alignment or shape induced by thermal, rotational, or vibrational operating conditions, etc.

[0245] Although the present disclosure has been provided with reference to specific illustrative embodiments, those skilled in the art will recognize that various modifications may be made and equivalents may be substituted for elements of the embodiments without departing from the scope or spirit of the disclosure. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the disclosure without departing from the essential scope thereof. [Explanation of symbols]

[0246] 10 DPT System 12 Fluid source 14 patients 16 Patient Monitor Cable 18 Transport Monitor 20 Multi-signal pressure cable 22 Primary Monitor 24 Secondary Monitor 26 DPT Subassembly 28 Hybrid Connector 30 Flow Element 32 Upstream fitting 34 Stopcock 36 Front cover 38 Rear cover 40 connector cable 44 Channel window 46 Cover snap fitting 48 Flash Tab 52, 54 Fluid line connector 56 Stopcock lever 58 Structural Housing 62 Snap attachment 64 Channel depression 66 Cover opening 68 Cover entrance side 70 Cover outlet side 72 Side of cover 74 Pedestal 76 Retention Slots 78 Flow path connector sleeve 80 colors 82 Channel inlet 84 Flow path outlet 86 Flash Tab Color 88 fluid channels 90 Channel Wall 92 Upstream channel section 94 Downstream channel section 96 Channel Divider Wall 98 Flash entrance 100 Flash outlet 102 flash chamber 104 Flush tab plunger 106 Flash Tab Pull 108 sensors 110 Sensor cutout 112 Structural housing base 114 Sensor support 116 Conductor 118 Conductor separator 120 Conductor support 122 Clamp flange 124 Clamp flange 126 Stopcock contact part 150A, 150B, 150C, 150D protrusion 152A, 152B, 152C, 152D Receptacles 154 Side Panel 156A, 156B, 156C, 156D protrusions 158A, 158B, 158C, 158D Barb 160A, 160B, 160C, 160D Ribs 162A, 162B, 162C, 162D Beam axis 164A, 164B, 164C, 164D Tapered surface 166A, 166B, 166C, 166D lip surface 168A, 168B, 168C, 168D Gazette 170 Side wall 172A, 172B, 172C, 172D pockets 174A, 174B, 174C, 174D Undercut 176A, 176B, 176C, 176D opening 178 Shelf surface 180A, 180B, 180C, 180D restraining surface 182 Pedestal 184 Saddle 186 End Surface 188 Protective Cover 190 saddle surface 192 Cantilever support 194 segments 196 Cover entrance opening 198 Cover outlet opening 200 Cover entrance side 202 Cover outlet side 204 Side 206 Front side 208 Side Gusset 210 Longitudinal Rib 211 Cylinder 212 Semi-cylindrical channel 214 End face 218 Circumferential surface 400 Analog Sensor 402 Digital Sensor 404 Analog Sensor Conductor 406 Digital Sensor Conductor 408, 410 Outer sensor standoffs 412 Inner sensor separator 414, 416 Contact pin 418, 420 Sensor cavity 422, 424 Flow path connection 426, 428 Sensor contact part 430 Sensor cutout 432, 434 sensor surface 500 plug 502 Overmolded part 503 Seal ring 504 Shroud 506 Grip 508 Oval Area 510 Top wall 512, 514 Notch 516 Keyway 518 Vertical Wall 520 horizontal wall 522 Top pin slot 524 bottom pin slot 526a~526d Analog signal pins 528a~528d Digital signal pins 530 Snap Slot 532 Pin U-turn section 534 Wire Guide 536 Conductor Slot 538 Pin U-turn section 540 Modular Plug 542 Seal Ring Shot 544 Overmolded Slot 546 Accommodation Gap 600 Hybrid Connector 602 Analog signal cable 604 Analog Signal Connector 606 Digital Signal Cable 608 Digital Signal Connector 610 outer shell 612 Receptacle 614 Substrate 616 Structural Anchor 618 Electrical Connections 620 Receptacle Overmold 622 oval socket 624 Analog signal contact 626 Digital signal contact 628 Shelf 630 Snap Key 634 Receptacle surface 636 Contact support 638 Contact support body 640 Support Arm 644 Electrical contact part 646 Axial section 648 Electrical contact part 650 Overmolded Retention Flange 652 Snap engagement part 1000 Patient Monitoring System 2000 Associated Patient Monitoring Systems

Claims

1. 1. A dual differential pressure transducer assembly comprising: an intravenous (IV) fluid inlet configured to receive fluid from an IV bag; an IV fluid outlet configured to deliver the fluid to a patient IV needle; a flow path element defining a fluid channel connecting the IV fluid inlet to the IV fluid outlet, the fluid channel defining a centerline axis of the dual differential pressure transducer assembly; a first sensor cavity disposed alongside the fluid channel and fluidly connected to the fluid channel via a first cutout through the flowpath element, the first cutout extending transversely to the centerline axis; a second sensor cavity disposed alongside the fluid channel and parallel to the first sensor cavity and fluidly connected to the fluid channel via a second cutout through the flowpath element, the second cutout extending transversely to the centerline axis and axially aligned with but angularly offset from the first cutout relative to the centerline axis; a first differential pressure sensor having a first sensor face abutting the first sensor cavity and exposed to the fluid channel through the first cutout; a second differential pressure sensor having a second sensor face abutting the second sensor cavity and exposed to the fluid channel through the second cutout; separate signal conductors connected to the first differential pressure sensor and the second differential pressure sensor, respectively; 1. A dual differential pressure transducer assembly comprising:

2. 10. The dual differential pressure transducer assembly of claim 1, wherein the first differential pressure sensor is an analog sensor and the second differential pressure sensor is a digital sensor.

3. The separate signal conductors are: a first plurality of signal conductors arranged to carry analog electrical signals from the first differential pressure sensor; a second plurality of signal conductors arranged to carry digital signals from the second differential pressure sensor; Equipped with 3. The dual differential pressure transducer assembly of claim 2, wherein the first plurality of signal conductors and the second plurality of signal conductors are disposed side-by-side with the first sensor and the second sensor in a common plane and are enclosed with the first differential pressure sensor and the second differential pressure sensor in a common housing.

4. 4. The dual differential pressure transducer assembly of claim 3, wherein the common housing encloses the first differential pressure sensor, the second differential pressure sensor, and at least a portion of the fluid channel aligned with the first notch and the second notch.

5. 2. The dual differential pressure transducer assembly of claim 1, wherein the first notch and the second notch are separated by an angle less than 180 degrees or greater than 90 degrees relative to the centerline axis.

6. 2. The dual differential pressure transducer assembly of claim 1, wherein the fluid channel has a diameter of 1 mm to 8 mm at the axial location of the first notch and the second notch.

7. 2. The dual differential pressure transducer assembly of claim 1, wherein a cross-sectional area of ​​the fluid channel through a plane perpendicular to the centerline axis is narrowest at a location upstream of the first notch and the second notch.

8. 2. The dual differential pressure transducer assembly of claim 1, wherein the first and second notches intersect with the fluid channels at first and second channel openings, the first and second channel openings being elongated openings with a major dimension parallel to the centerline axis.

9. 9. The dual differential pressure transducer assembly of claim 8, wherein the first channel opening and the second channel opening each have a circumferential width relative to the centerline axis that is greater than 0.005 inches (0.133 mm) at the location of the first channel opening and the second channel opening, or less than 25% of the total circumference of the channel.

10. 10. The dual differential pressure transducer assembly of claim 9, wherein the first channel opening and the second channel opening each have an axial length relative to the centerline axis that is at least 0.005 inches and is less than the axial extent of a sealing face of the first differential pressure sensor and the second differential pressure sensor.

11. 10. The dual differential pressure transducer assembly of claim 9, wherein the first channel opening and the second channel opening each have an axial length relative to the centerline axis of between 0.07 inches and 0.08 inches.

12. 9. The dual differential pressure transducer assembly of claim 8, wherein the first channel opening and the second channel opening each subtend an angle of less than 5 degrees relative to the centerline axis.

13. 9. The dual differential pressure transducer assembly of claim 8, wherein the first and second notches each extend from a narrowest portion at the first and second channel openings, respectively, to a widest portion at the first and second sensor faces, respectively, depending on radial position relative to the centerline axis, and are defined in part by walls extending from the fluid channel to the first and second differential pressure sensors, respectively, the walls being parallel to each other and the centerline axis but offset from each other and the centerline axis.

14. 10. The dual differential pressure transducer assembly of claim 1, wherein at least one of the first sensor surface and the second sensor surface is defined by a flexible gel diaphragm.

15. a stopcock disposed along the fluid channel downstream of the first notch and the second notch, the stopcock being actuable between a plurality of valve states, the plurality of valve states comprising: a first condition fluidly isolating the IV fluid inlet from the IV fluid outlet; a second state fluidly connecting the IV fluid inlet to the IV fluid outlet; 10. The dual differential pressure transducer assembly of claim 1, comprising:

16. 2. The dual differential pressure transducer assembly of claim 1, further comprising a flush tab disposed alongside a wall within the fluid channel to selectively permit flow from upstream to downstream over the wall through the fluid channel, the flush tab being disposed upstream of the first notch and the second notch.

17. The dual differential pressure transducer assembly of claim 1 , wherein the dual differential pressure transducer assembly is sterile.

18. 10. The dual differential pressure transducer assembly of claim 1, further comprising a connector cable terminating in a connector plug and surrounding the separate signal conductors from the first and second differential pressure sensors to the connector plug.

19. The connector plug a plug body disposed for insertion into a receiving receptacle; a first plurality of pins electrically connected to a first differential pressure sensor via a first subset of the separate signal conductors; a second plurality of pins electrically connected to the second differential pressure sensor via a second subset of the separate signal conductors separate from the first subset of the separate signal conductors; Equipped with 20. The dual differential pressure transducer assembly of claim 18, wherein the first and second plurality of pins are disposed on opposite sides of the plug body.

20. 1. A differential pressure transducer assembly comprising: A flow path element, a channel wall defining a fluid channel connecting a fluid inlet to a fluid outlet and defining a centerline axis of the differential pressure transducer assembly; side plates extending vertically outward from opposite sides of the channel wall; A plurality of protrusions cantilevered from the side plate, each of the plurality of protrusions comprising: a beam extending perpendicularly from the side plate and parallel to a beam axis; a barb disposed at a distal end of the beam; a plurality of protrusions, a flow path element comprising: A structural housing comprising: With the base, a sidewall extending from the base and defining a recess conforming to the outer periphery of the side plate; a plurality of receptacles adapted to receive a respective protrusion of the plurality of protrusions, each receptacle of the plurality of receptacles comprising: a pocket open along the beam axis; an undercut extending from the pocket into the structural housing perpendicular to the beam axis; Equipped with a receptacle, each protrusion of the plurality of protrusions being insertable along the beam axis into a respective receptacle along the beam axis; a structural housing comprising: A stopcock, A cylindrical body; a first semi-annular collar segment forming a first sector of the cylinder; a stopcock comprising: a front cover mated with a rear cover and cooperating with the rear cover to enclose the structural housing and the flow path elements; a pair of cantilever supports extending from the front cover or the rear cover and resiliently engaging with the structural housing to bias the structural housing and the flow path element into engagement with the stopcock; a support pedestal extending from the rear cover and defining a semi-cylindrical channel and a first retention slot, the semi-cylindrical channel receiving the flow path element and the stopcock, the first retention slot receiving the first semi-annular collar segment, and abutting surfaces of the first semi-annular collar segment and the first retention slot restraining the stopcock, the flow path element, and the structural housing against the pair of cantilever supports.

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