Valve seal for an endoscope

Abstract

Endoscopes (e.g., duodenoscopes) include dual-fluid valves for controlling the flow of water and air through a flexible tubular probe to flush or inflate the patient's lumen, respectively. Some examples of these dual-fluid valves include flexible valve seals that allow air to flow in one direction but not in the opposite direction. Different examples of these valve seals include features such as: a set of overlapping flexible flaps arranged in a spiral; a rubber disc with a cross-shaped array of perforations that opens in response to a positive pressure differential across the disc; an elastically expandable cone with multiple concentric ridges; a valve core surrounded by an elastic tubular member capable of radial expansion to open an air passage within the valve core; and an elastic tube that bulges radially outward when compressed or otherwise shortened to block the annular air passage.

Description

Cross-references to related applications

[0001] This application claims the benefit of U.S. Provisional Patent Application Serial No. 63 / 589,863, filed on October 12, 2023, the disclosure of which is incorporated herein by reference. Background Technology

[0002] Endoscopy has revolutionized medical diagnosis and intervention by allowing physicians to directly observe the internal cavities of the human body without invasive surgery. Among the various types of endoscopes, the duodenoscope stands out due to its ability to probe the upper gastrointestinal tract, particularly the duodenum, pancreas, and bile ducts. The duodenoscope not only aids in visual examinations but also facilitates a range of treatment procedures, making it an indispensable tool in modern medicine.

[0003] A duodenoscopy typically includes a flexible tubular probe for insertion into the patient. A light source located at the distal end of the probe provides illumination for observation. Typically, a high-resolution camera is placed adjacent to the light source to capture real-time images or video of the internal lumen. The camera's capabilities ensure detailed and accurate observation.

[0004] Duodenoscope probes typically include a working channel, allowing the insertion of various instruments for procedures such as biopsies, tissue removal, or stent placement. To provide maneuverability and access to complex anatomical structures, many duodenoscope probes have internal threads. The tension in these threads can be adjusted in pairs in opposite directions by manipulating knobs on the duodenoscope's handle. Adjusting the thread tension allows the probe to bend and deflect.

[0005] The handle body typically includes valves (e.g., one-way sealing valves and two-fluid valves) for controlling fluid flow, such as air for inflation and water for flushing. Inflation is a technique used during endoscopic procedures to improve visualization. Inflation involves introducing air or carbon dioxide into the cavity being examined, which helps expand the space, allowing for better visualization of target areas. In duodenoscopy, inflation helps assess the mucosal surface and identify abnormalities that would otherwise be obscured. This technique improves diagnostic accuracy and helps determine appropriate treatment strategies.

[0006] Irrigation typically involves introducing a fluid, such as sterile water or saline. During endoscopic procedures, irrigation serves several purposes. Irrigation can help clear blood, debris, or mucus from the field of vision, ensuring clear visibility. Irrigation can also aid in therapeutic interventions by flushing the area of ​​interest, allowing for better access and manipulation of tissue. This feature can improve the safety and effectiveness of procedures such as polyp removal or tissue sampling. Summary of the Invention

[0007] This disclosure generally relates to dual-fluid valves for endoscopes, wherein these dual-fluid valves can be selectively configured into an inflation configuration and a flushing configuration. In some examples, the dual-fluid valve can be further configured into a venting configuration. Some examples of dual-fluid valves include a valve housing having an inner surface that at least partially defines the interior of the housing. In some examples, the valve housing at least partially defines a gas inlet and a gas outlet. Some examples of dual-fluid valves include a valve core that is elongated to define an axial direction. In some examples, the valve core extends into the interior of the housing. In some examples, the valve core and the inner surface define an annular gap therebetween. Some examples of dual-fluid valves include a valve seal that extends radially across the annular gap between the valve core and the inner surface. In some examples, the valve seal includes a plurality of flaps that are elastically flexible between a deformed shape and a more relaxed shape. In some examples, when the dual-fluid valve is in the inflation configuration, the plurality of flaps are in a deformed shape to fluidly connect the gas inlet and the gas outlet. In some examples, when the dual-fluid valve is in flush configuration, multiple flaps are in a more relaxed shape to block fluid communication between the gas inlet and the gas outlet.

[0008] In some examples, the two-fluid valve may include a valve housing having an inner surface that at least partially defines the interior of the housing. In some examples, the valve housing at least partially defines a gas inlet and a gas outlet. In some examples, the two-fluid valve may include a valve core that is elongated to define an axial direction. In some examples, the valve core extends into the interior of the housing. In some examples, the valve core and the inner surface define an annular gap therebetween. In some examples, the two-fluid valve may include a valve seal that extends radially across the annular gap between the valve core and the inner surface. In some examples, the valve seal is elastically flexible between a deformed shape and a more relaxed shape. In some examples, when the two-fluid valve is in an inflated configuration, the valve seal is in a deformed shape to fluidly connect the gas inlet and the gas outlet. In some examples, when the two-fluid valve is in a closed configuration, the valve seal is in a more relaxed shape to block fluid communication between the gas inlet and the gas outlet. In some examples, the dual-fluid valve includes multiple concentric ridges located on the surface of the valve seal, extending around the valve core and arranged substantially perpendicular to the axial direction. In some examples, the multiple concentric ridges are distributed along an axial length that is greater when the valve seal is in a deformed shape than when it is in a more relaxed shape. In some examples, the valve seal has an outer radial perimeter that is larger when it is in a more relaxed shape than when it is in a deformed shape.

[0009] In some examples, the two-fluid valve may include a valve housing having an inner surface that at least partially defines the interior of the housing. In some examples, the valve housing at least partially defines a gas inlet and a gas outlet 4. Some examples of the two-fluid valve may include a valve core that is elongated to define an axial direction. In some examples, the valve core extends into the interior of the housing. In some examples, the valve core defines a gas passage between the gas inlet and the gas outlet 4. Some examples of the two-fluid valve may include a valve seal that surrounds and is attached to the valve core. In some examples, the valve seal elastically expands from a more relaxed shape to a deformable shape in response to a pressure difference between the gas inlet and the gas outlet exceeding a predetermined threshold. In some examples, when the two-fluid valve is in an inflated configuration, the valve seal is in a deformable shape to open the gas passage and thereby fluidly connect the gas inlet and the gas outlet. In some examples, when the two-fluid valve is in a flushing configuration, the valve seal is in a more relaxed shape to block the gas passage and thereby block the fluid communication between the gas inlet and the gas outlet.

[0010] In some examples, the two-fluid valve may include a valve housing having an inner surface that at least partially defines the interior of the housing. In some examples, the valve housing at least partially defines a gas inlet and a gas outlet. In some examples, the two-fluid valve may include a sleeve supported within the housing by the valve housing. In some examples, the two-fluid valve may include a valve spool that is elongated to define an axial direction. In some examples, the valve spool extends through the sleeve and is selectively movable relative to the sleeve in the axial direction to an initial position, a partially depressed position for an inflation configuration, and a fully depressed position for a flushing configuration. In some examples, the two-fluid valve may include a valve seal having a first end, a second end, and a radially expandable section therebetween. In some examples, the first end is substantially stationary relative to the sleeve. In some examples, the second end is relatively stationary relative to the valve spool. In some examples, when the valve spool is in the initial position, the radially expandable section engages the inner surface of the valve housing. In some examples, when the valve spool is in the partially depressed position, the radially expandable section is spaced apart from the inner surface. In some examples, when the valve core is in the fully depressed position, the radially expandable section is spaced apart from the inner surface.

[0011] In some examples, the two-fluid valve may include a valve body. In some examples, the two-fluid valve may include a valve spool extending into the valve body and capable of selectively moving relative to the valve body to an initial position, a partially depressed position for an inflation configuration, and a fully depressed position for a flushing configuration. In some examples, the two-fluid valve may include a valve seal comprising a first end and a second end. In some examples, the valve seal has a seal length as measured from the first end to the second end. In some examples, the first end is substantially stationary relative to the valve body. In some examples, the second end is substantially stationary relative to the valve spool. In some examples, the seal length is longer when the valve spool is in the fully depressed position. In some examples, the seal length is shorter when the valve spool is in the initial position.

[0012] The foregoing summary is provided to facilitate understanding of some of the features of this disclosure and is not intended to be an exhaustive description. A full understanding of this disclosure can be obtained by reading the entire specification, claims, drawings, and abstract. Attached Figure Description

[0013] Figure 1 This is a perspective view of an exemplary endoscope having a dual-fluid valve incorporating various embodiments of the present disclosure.

[0014] Figure 2 This is a cross-sectional view of an exemplary two-fluid valve in its original position and venting configuration, wherein the two-fluid valve includes an exemplary valve seal shown in its more relaxed shape, and the two-fluid valve and valve seal include various embodiments disclosed herein.

[0015] Figure 3 Is with Figure 2 A similar cross-sectional view, but showing the two-fluid valve in its original position and inflated configuration, while the valve seal is in a deformed shape.

[0016] Figure 4 Is with Figure 2 A similar cross-sectional view, but showing a two-fluid valve in the depressed position and flush configuration, while the valve seal is in its more relaxed shape.

[0017] Figure 5 It is possible Figures 2 to 4 A perspective view of an exemplary valve seal used in a dual-fluid valve, wherein the valve seal is in its more relaxed shape.

[0018] Figure 6 yes Figure 5 Top view.

[0019] Figure 7 yes Figure 6 The right-side view.

[0020] Figure 8 It is possible Figures 2 to 4 Exploded perspective view and assembled perspective view of an exemplary valve seal used in a dual-fluid valve.

[0021] Figure 9 This is a cross-sectional view of an exemplary two-fluid valve in its original position and venting configuration, wherein the two-fluid valve includes an exemplary valve seal shown in its more relaxed shape, and the two-fluid valve and valve seal include various embodiments disclosed herein.

[0022] Figure 10 Is with Figure 9 A similar cross-sectional view, but showing the two-fluid valve in its original position and inflated configuration, while the valve seal is in a deformed shape.

[0023] Figure 11 Is with Figure 2 A similar cross-sectional view, but showing a two-fluid valve in the depressed position and flush configuration, while the valve seal is in its more relaxed shape.

[0024] Figure 12 yes Figure 9 The right-side view of the valve seal is shown, with the valve seal in a more relaxed shape.

[0025] Figure 13 yes Figure 9 The left-side view of the valve seal shown.

[0026] Figure 14 yes Figure 12 A close-up view.

[0027] Figure 15 yes Figure 13 A close-up view.

[0028] Figure 16 Is with Figure 14 A similar close-up view, but showing the valve seal in a more open, deformed shape.

[0029] Figure 17 Is with Figure 15 A similar close-up view, but showing the valve seal in a more open, deformed shape.

[0030] Figure 18 It is along Figure 14 The cross-sectional view taken from line 18-18.

[0031] Figure 19 It is along Figure 16 The cross-sectional view taken from line 19-19.

[0032] Figure 20 Is with Figure 18A similar cross-sectional view, but showing a second example of a valve seal.

[0033] Figure 21 Is with Figure 19 A similar cross-sectional view, but showing a second example of a valve seal.

[0034] Figure 22 This is a cross-sectional view of another exemplary two-fluid valve in its original position and venting configuration, wherein the two-fluid valve includes an exemplary valve seal shown in its more relaxed shape, and the two-fluid valve and valve seal include various embodiments disclosed herein.

[0035] Figure 23 Is with Figure 22 A similar cross-sectional view, but showing the two-fluid valve in its original position and inflated configuration, while the valve seal is in a deformed shape.

[0036] Figure 24 Is with Figure 22 A similar cross-sectional view, but showing a two-fluid valve in the depressed position and flush configuration, while the valve seal is in its more relaxed shape.

[0037] Figure 25 It is a radial cross-sectional view of the valve seal in its more relaxed shape.

[0038] Figure 26 It is a radial cross-sectional view of the valve seal in its deformed shape.

[0039] Figure 27 Is with Figure 25 A similar radial section view, but showing a second example of a valve seal in a more relaxed shape.

[0040] Figure 28 This is a radial cross-sectional view of the second valve seal in its deformed shape.

[0041] Figure 29 This is a cross-sectional view of an exemplary two-fluid valve in its original position and venting configuration, wherein the two-fluid valve includes an exemplary valve seal shown in its more relaxed shape, and the two-fluid valve and valve seal include various embodiments disclosed herein.

[0042] Figure 30 Is with Figure 29 A similar cross-sectional view, but showing the two-fluid valve in its original position and inflated configuration, while the valve seal is in a deformed shape.

[0043] Figure 31 Is with Figure 29 A similar cross-sectional view, but showing a two-fluid valve in the depressed position and flush configuration, while the valve seal is in its more relaxed shape.

[0044] Figure 32 This is a cross-sectional view of another exemplary two-fluid valve in its original position and venting configuration, wherein the two-fluid valve includes an exemplary valve seal shown in its more relaxed shape, and the two-fluid valve and valve seal include various embodiments disclosed herein.

[0045] Figure 33 Is with Figure 32 A similar cross-sectional view, but showing the two-fluid valve in its original position and inflated configuration, while the valve seal is in a deformed shape.

[0046] Figure 34 Is with Figure 32 A similar cross-sectional view, but showing a two-fluid valve in the depressed position and flush configuration, while the valve seal is in its more relaxed shape.

[0047] Figure 35 This is a cross-sectional view of yet another exemplary two-fluid valve in its original position and venting configuration, wherein the two-fluid valve includes an exemplary valve seal shown in its more relaxed shape, and the two-fluid valve and valve seal include various embodiments disclosed herein.

[0048] Figure 36 Is with Figure 35 A similar cross-sectional view, but showing the two-fluid valve in its original position and inflated configuration, while the valve seal is in a deformed shape.

[0049] Figure 37 Is with Figure 35 A similar cross-sectional view, but showing a two-fluid valve in the depressed position and flush configuration, while the valve seal is in its more relaxed shape. Detailed Implementation

[0050] Figures 1 to 37 Various examples of a dual-fluid valve 12 (e.g., a one-way sealing valve) for endoscope 10 and its usage are shown. When referring to a valve, the term "dual-fluid" means that the valve can handle at least two fluid flows, one of which is a gas and the other a liquid. The valve can be a single component, an interconnecting assembly of components, or multiple separate components. The term "endoscope" refers to any medical device having a flexible tubular probe 14 for insertion into a patient 16 to visually explore the patient's internal tissues and cavities and to introduce water, air, or other fluids as desired. Some exemplary endoscopes 10 have internal lines 18 with adjustable tension for bending and redirecting the flexible tubular probe 14. Figure 1 Some examples of the endoscopes 10 shown include duodenoscopes, colonoscopes, ureteroscopes, bronchoscopes, laparoscopes, sheaths, and catheters.

[0051] Endoscope 10 is shown as an example, and many of the components listed below are optional. Some examples of endoscope 10 include components such as: a handle body 20; a flexible tubular probe 14 extending from the handle body 20; dual-fluid valves 12 (e.g., dual-fluid valves 12a-f) for controlling the flow of fluids 22 (e.g., liquid 22a and gas 22b); a steering knob 24 for adjusting the tension in the internal line 18; a locking lever 26 for locking the position of the steering knob 24; a biopsy port 28 for sampling extracted tissue or fluid; a control unit 30; an umbilical cable 32 connecting the control unit 30 to the handle body 20; and an image capture button 34.

[0052] The control unit 30 provides a variety of functions. Some examples of such functions include: supplying liquid 22a (e.g., water, saline solution, etc.); supplying gas 22b (e.g., air, carbon dioxide, etc.); sending and receiving electrical signals; processing electrical signals; providing a vacuum source, etc. Some of the functions of the control unit listed herein are optional. The umbilical cable 32 connects the control unit 30 to the dual-fluid valve 12, the flexible tubular probe 14, or other endoscope-related components in a signal-communication or fluid-communication manner.

[0053] In some examples, the flexible tubular probe 14 includes various components such as an internal wire 18 for steering, a tube 36 (one or more tubes) for conveying fluid 22, an optical fiber cable 38 for conveying images or light, and an electrical wire 40 for conveying power or signals. Some of these probe components are optional.

[0054] The flexible tubular probe 14 has a proximal end 42 and a distal end 44. The proximal end 42 is connected to the handle body 20, and the distal end 44 extends away from the handle body 20. At the distal end 44, some examples of the flexible tubular probe 14 include a lamp 46 (or a fiber optic cable leading to the lamp) for illuminating the patient's internal cavities, a camera 48 (or a fiber optic cable leading to the camera), an end 48 of the tubing 36, and a lifter 50 for tilting the end 48 of the tubing 36. The lifter 50 is also referred to as a swing support, pivot support, and elevation bed. The end 48 of the tubing 36 is open to allow fluid 22 to pass through for inflating, flushing, or biopsy sampling.

[0055] Inflation and flushing can be controlled in different ways by various examples of the dual-fluid valve 12 (e.g., dual-fluid valves 12a-f). Figures 2 to 8 In the example shown, the dual-fluid valve 12a can be selectively configured in a venting configuration ( Figure 2 ), inflatable configuration ( Figure 3 ) and flushing configuration ( Figure 4A venting configuration can prevent or minimize the outward release of gas 22b through the flexible tubular probe 14. An inflation configuration can be used to deliver gas 22b downward through the flexible tubular probe 14 and outward through the distal end 44 to expand the body cavity for better observation. A flushing configuration can be used to flush certain areas with liquid 22a during examination. To select the desired configuration, some examples of the two-fluid valve 12a include a valve housing 52 in which the valve core 54 can be in its original position ( Figure 2 and Figure 3 ) and pressing position ( Figure 4 They move longitudinally in the axial direction of 100.

[0056] In some examples of the dual-fluid valve 12a, the valve core 54 has a vent 72 that a user 70 (e.g., a practicing physician) can manually cover or expose. Figure 2 As shown, when the valve core 54 is in its original position, and the vent 72 is exposed, the dual-fluid valve 12a is in the vent configuration. Figure 3 As shown, when the valve core 54 is in its original position and the vent 72 is covered, the dual-fluid valve 12a is in an inflatable configuration. Figure 4 As shown, when the valve core 54 is in the depressed position and the vent 72 is covered, the dual-fluid valve 12a is in the flushing configuration.

[0057] Some examples of a dual-fluid valve 12a include a valve body 52, a valve core 54, a valve seal 74, a first set of seals 76, a second seal 78, and a spring 80. The spring 80 pushes the valve core 54 to its original position. In some examples, the valve seal 74 surrounds and is attached to the valve core 54. In some examples, the valve seal 74 extends radially across an annular gap 82 between the OD (outer diameter) of the valve core 54 and the ID (inner diameter) of the inner surface 84 of the valve body.

[0058] In some examples, the first set of seals 76 is carried by the valve core 54 and positioned within the valve housing 52 to control the flow of liquid 22a through the dual-fluid valve 12a. In some examples, a second seal 78 on the valve core 54 helps prevent any fluid 22 from leaking from the dual-fluid valve 12a between the OD of the valve core 54 and the ID of the valve housing 52.

[0059] The valve housing 52 is supported by the handle body 20, such as Figures 2 to 4 As shown, the support device is schematically illustrated because the valve housing 52 can be connected in any desired manner and at any position and orientation relative to the handle body 20. In some examples, the valve housing 52 is a seamless, one-piece extension of the handle body 20.

[0060] The valve housing 52 is shown as a seamless monolithic piece (i.e., a single part rather than an assembly of parts); however, other examples of the valve housing 52 include multiple parts. In some examples, the multiple parts are interconnected as assemblies. In some examples, the multiple parts are separate and spaced apart from each other. In some examples, the valve core 54 is made of metal (e.g., stainless steel, brass, bronze, titanium, aluminum, etc.), while the valve housing 52 is made of polymer (e.g., nylon, PEEK (polyetheretherketone), polycarbonate, ABS (acrylonitrile-butadiene-styrene), HDPE (high-density polyethylene), UHMW (ultra-high molecular weight polyethylene), POM (polyoxymethylene, polyacetal, Delrin, Celcon, etc.), POM-C (polyoxymethylene copolymer), and POM-H (polyoxymethylene homopolymer)). This combination of metal and polymer materials can provide a precise fit and low friction between the valve core 54 and the valve housing 52.

[0061] Some examples of valve housing 52 at least partially define or otherwise provide a liquid inlet 60, a liquid outlet 62, a gas inlet 64, and a gas outlet 66. The terms "inlet" and "outlet" refer to areas through which fluid can pass. Some examples of inlets and outlets include valve ports, valve orifices, pipes connected to the valve, fluid delivery chambers within the valve, etc.

[0062] The liquid inlet 60 of the valve housing 52 receives liquid 22a from the control unit 30 via an umbilical cable 32. A fitting 36 within the flexible tubular probe 14 connects the liquid outlet 62 to the distal end 44 of the probe. Similarly, the gas inlet 64 of the valve housing 52 receives gas 22b from the control unit 30 via an umbilical cable 32. A fitting 36 within the flexible tubular probe 14 connects the gas outlet 66 to the distal end 44 of the probe.

[0063] The axial position of valve core 54 within valve housing 52 determines whether liquid 22a can flow from liquid inlet 60 to liquid outlet 62. When valve core 54 is in its original position ( Figure 2 and Figure 3 When the valve core 54 is in the depressed position, the first set of seals 76 is positioned within the valve housing 52 to prevent liquid 22a from flowing through the dual-fluid valve 12a. Figure 4 When the first set of seals 76 is in position, it fluidly connects the liquid inlet 60 and the liquid outlet 62, so that the liquid 22a can flow through the dual fluid valve 12a and be released outward through the distal end 44 of the flexible tubular probe 14.

[0064] In some examples, the axial position of the valve core 54 within the valve housing 52 and whether the vent 72 is covered determine whether the valve seal 74 allows gas 22b to flow from the gas inlet 64 to the gas outlet 66. In some examples, the gas 22b at the gas inlet 64 is approximately 5-9 psig. In some examples, the shape of the valve seal 74, particularly its shape, determines whether gas 22b can flow past the valve seal. In some examples, the valve seal 74 responds to a positive pressure differential between the gas inlet 64 and the gas outlet 66 exceeding a predetermined threshold (e.g., positive 0.1 psi) from a more relaxed shape. Figure 2 and Figures 4 to 7 ) elastically expands into deformable shape ( Figure 3 Therefore, a positive pressure difference (the pressure at gas inlet 64 is greater than the pressure at gas outlet 66) essentially pushes valve seal 74 open. However, a negative pressure difference (the pressure at gas inlet 64 is less than the pressure at gas outlet 66) forces valve seal 74 to close, thereby preventing unwanted backflow.

[0065] In some examples, the valve seal 74 includes a plurality of flaps 86, which are in a deformable shape ( Figure 3 ) and a more relaxed shape ( Figure 2 and Figures 4 to 7 The relationship between the two fluid valves is flexible and elastic. In some examples, when the two-fluid valve 12a is in the venting configuration ( Figure 2 When multiple lobes 86 are in a more relaxed shape, Figure 2 and Figures 5 to 7 This prevents or minimizes the leakage of gas 22a through the flexible tubular probe 14. In the venting configuration, the pressure at the gas inlet 64 is relatively low (close to atmospheric pressure) because the vent 72 fluidly connects the gas inlet 64 to the atmosphere 88 (i.e., the ambient air surrounding the endoscope 10). Therefore, the pressure difference between the gas inlet 64 and the gas outlet 66 is insufficient to open the valve seal 74.

[0066] In some examples, when the dual-fluid valve 12a is in the inflation configuration ( Figure 3 When the gas is inflated, multiple flaps 86 deform into a shape, thereby fluidly connecting the gas inlet 64 and the gas outlet 66. In the inflation configuration, the valve core 54 is in its original position and the vent 72 is covered. With the vent 72 closed, the pressure at the gas inlet 64 can rise above atmospheric pressure and push the valve seal 74 open. Then, the gas 22a flows freely in sequence through the gas inlet 60, through the valve seal 74, through the gas outlet 66, through the flexible tubular probe 14, and out through the distal end 44 of the probe.

[0067] In some examples, when the dual-fluid valve 12a is in the flushing configuration ( Figure 4When multiple lobes 86 are in a more relaxed shape, Figures 4 to 7 In the flushing configuration, the shoulder 90 on the valve core 54 seals against the valve seat 92 of the valve housing 52. This seal of the shoulder 90 against the valve seat 92 blocks fluid communication between the gas inlet 64 and the gas outlet 66. This results in the equalization of the pressure differential across the valve seal 74, causing the valve seal 74 to return to its more relaxed shape, such as... Figure 4 As shown.

[0068] In some examples, the shape and arrangement of the multiple flaps 86 of the valve seal are as follows: Figures 5 to 8 As shown. The example shown illustrates a valve seal 74 with eighteen discs 86. Other examples of valve seal 74 have more than eighteen discs. Other examples have fewer than eighteen discs.

[0069] exist Figures 2 to 8 In the example shown, the inner periphery 94 of the valve seal 74 is attached to the valve core 54, and a plurality of flaps 86 are distributed in a circular pattern around the valve core 54. Each flap 86 includes an inlet edge 96 and an outlet edge 98. Each inlet edge 96 faces or is otherwise exposed to the gas inlet 64. Each outlet edge 98 faces or is otherwise exposed to the gas outlet 66. Thus, the inlet edge 96 and the outlet edge 98 are located on opposite surfaces of the valve seal 74. The plurality of flaps 86 are arranged in an overlapping manner such that the inlet edge 96 of each flap 86 covers the outlet edge 98 of the adjacent flap 86. This causes the plurality of flaps 86 to slide in overlapping contact with each other at the inlet edge 96 and the outlet edge 98. The sliding contact of the plurality of flaps 86 allows the valve seal 74 to flex freely in the axial direction 100 without generating excessive circumferential strain along the outer periphery 102 of the valve seal 74.

[0070] When in its deformed shape, the outer periphery 102 of the seal is spaced apart from the inner surface 84 of the valve body, such as... Figure 3 As shown. In a more relaxed shape ( Figures 5 to 7 When the outer periphery 102 is joined to the inner surface 84, such as Figure 2 and Figure 4 As shown.

[0071] In some examples, the valve seal 74 is first injection molded into plastic, followed by a second operation: cutting the valve seal 74 between the overlapping edges of adjacent flaps 86. In some examples, the cutting angle 104 is larger near the inner periphery 94 than at the outer periphery 102, for the same reason that the helix angle of a screw is larger near the root diameter of the thread than at the outer diameter of the thread.

[0072] Although manufacturing valve seal 74 may seem challenging, it is possible. In some examples, such as Figure 8As shown, the valve seal 74 is injection molded into two parts: a first half 74a and a second half 74b. The first half 74a includes a first half hub 106a having a plurality of integrally formed lobes 86a. Similarly, the second half 74b includes a second half hub 106b having a plurality of integrally formed lobes 86b. After injection molding, the two halves 74a and 74b are placed back-to-back and rotated a few degrees, such that the two halves 74a and 74b interlock, with their respective lobes 86a and 86b overlapping. In some examples, the two halves 74a and 74b are injection molded in separate cavities and then assembled. In some examples, the first half 74a is overmolded onto the second half 74b in the same cavity. In some examples, the first half 74a and the second half 74b are identical. In some examples, the first half 74a and the second half 74b are made of different materials to facilitate overmolding one onto the other.

[0073] In some examples, the flaps 86 are made of a rubber-like material (such as silicone or TPE (thermoplastic elastomer)). In some examples, the material thickness of the flaps 86 is thin enough that it can be made of a harder material. In some examples, the valve seal 74 is overmolded onto the valve core 54 in a manner similar to some examples of the first set of seals 76 and the second seal 78. In some examples, the flaps 86 are substantially coplanar and arranged edge-to-edge rather than overlapping.

[0074] Figures 9 to 11 An exemplary dual-fluid valve 12b is shown, which is similar to dual-fluid valve 12a in many respects. Dual-fluid valve 12b includes the same valve housing 52 and valve spool 54 as dual-fluid valve 12a. Similar to dual-fluid valve 12a, the valve spool 54 in dual-fluid valve 12b is movable to its original position (…). Figure 9 and Figure 10 ) and pressing position ( Figure 11 The vent 72 in the dual-fluid valve 12b can be manually covered. Figure 10 and Figure 11 ) or exposed ( Figure 9 Depending on the position of the valve core 54 and whether the vent 72 is covered or exposed, the dual-fluid valve 12b can be selectively configured in a venting configuration. Figure 9 ), inflatable configuration ( Figure 10 ), or flushing configuration ( Figure 14 ).

[0075] Nevertheless, some examples of the dual-fluid valve 12b have different valve seals 108, such as Figures 12 to 21As shown. In the example shown, the valve seal 108 has an inner periphery 110 attached to the valve core 54 and an outer periphery 112 that maintains a sliding seal contact with the valve housing 52.

[0076] In some examples, the valve seal 108 includes a plurality of flaps 114 defining a plurality of slits 116, such as Figures 12 to 21 As shown. When multiple lobes 114 are in a deformed shape ( Figure 10 , Figure 16 , Figure 17 , Figure 19 and Figure 21 When multiple lobes 114 are in a more relaxed shape ( Figure 9 , Figures 11 to 15 , Figure 18 and Figure 20 Compared to the previous method, each slit 116 is more open to allow gas 22a to flow through.

[0077] In some examples, multiple lobes 114 are divided into multiple groups 118, such that each group 118 defines a cluster of intersecting slits 116. Each cluster of intersecting slits 116 is spaced apart from the inner periphery 110 and the outer periphery 112 to minimize leakage in these regions. The examples shown have four lobes 114 per group 118. Other examples have fewer than four lobes 114 per group 118, for example, three lobes per group 118. There are also other examples with more than four lobes 114.

[0078] Multiple flaps 114 and slits 116 operate on a unidirectional flow principle (similar to that of a conventional duckbill valve), wherein slits 116 open in response to a sufficient positive pressure differential applied across valve seal 108. In some examples, flaps 114 and slits 116 include a tapered inlet 120 to facilitate opening of slits 116 in response to a pressure differential. In some examples, flaps 114 and slits 116 include a protruding outlet 122 that further facilitates opening of slits 116.

[0079] Figures 22 to 24 An exemplary dual-fluid valve 12c is shown, which is similar to dual-fluid valve 12a in many respects. Dual-fluid valve 12c includes the same valve housing 52 and valve spool 54 as dual-fluid valve 12a. Similar to dual-fluid valve 12a, the valve spool 54 in dual-fluid valve 12c is movable to its original position (…). Figure 22 and Figure 23 ) and pressing position ( Figure 24 The vent 72 in the dual-fluid valve 12c can be manually covered. Figure 23 and Figure 24 ) or exposed ( Figure 22Depending on the position of the valve core 54 and whether the vent 72 is covered or exposed, the dual-fluid valve 12c can be selectively configured in a venting configuration. Figure 22 ), inflatable configuration ( Figure 23 ), or flushing configuration ( Figure 24 In various configurations, the control of fluid flow through the two-fluid valve 12c is as described with reference to the two-fluid valve 12a.

[0080] Some examples of the dual-fluid valve 12c have different valve seals 124, such as Figure 25 and Figure 26 As shown. Valve seal 124 extends radially 126 across an annular gap 82 between valve core 54 and the inner surface 84 of housing. Valve seal 124 is deformed in shape ( Figure 23 and Figure 26 ) and a more relaxed shape ( Figure 22 , Figure 24 and Figure 25 The relationship between them is elastic and flexible.

[0081] Sufficient pressure differential between gas inlet 64 and gas outlet 66 is what drives valve seal 124 to its deformed shape. In its deformed shape, the outer periphery 128 of valve seal 124 is radially spaced from the inner surface 84 of valve housing, allowing gas 22b to flow between the outer periphery 128 and the inner surface 84 of valve housing through valve seal 124. When the dual-fluid valve 12c is in its inflation configuration (… Figure 23 When the valve seal 124 is in a deformed shape, the gas inlet 64 and the gas outlet 66 are in fluid communication.

[0082] In a more relaxed configuration, when the differential pressure across valve seal 124 is below a predetermined threshold (e.g., below 0.1 psi), the outer periphery 128 of valve seal 124 sealably engages the inner surface 84 of the valve housing to block fluid communication between gas inlet 64 and gas outlet 66 in either direction. When the dual-fluid valve 12c is in a closed or open configuration, valve seal 124 is in a more relaxed configuration ( Figure 22 and Figure 24 ).

[0083] To increase flexibility and reduce circumferential strain at the outer periphery 128 of the seal, some examples of valve seal 124 include a surface 130 having multiple concentric ridges 132. The ridges 132 extend around the valve core 54 and are arranged substantially perpendicular to the axial direction 100. When referring to the ridges 132, the term "substantially perpendicular" means that each concentric ridge 132 is arranged along an imaginary plane at an angle of less than 10 degrees to the direction perpendicular to the axial direction 100. The multiple ridges 132 are distributed along an axial length 134, which is the length of the valve seal 124 in its deformed shape (…). Figure 23 and Figure 26 When in a more relaxed shape () Figure 22 , Figure 24 and Figure 25 The outer radial periphery 128 of the valve seal is larger when it is in a more relaxed shape than when it is in a deformed shape, in order to effectively seal radially against the inner surface 84 of the valve body.

[0084] In some examples, such as Figure 25 and Figure 26 As shown, the ridge 132 is formed by the valve seal surface 130 having multiple progressively increasing steps 136. In some examples, such as Figure 27 and Figure 28 As shown, the ridge 132 is formed by the wavy shape of the surface 130 of the valve seal.

[0085] Figures 29 to 31 An example of a dual-fluid valve 12d is shown. In some examples, the dual-fluid valve 12d includes a valve core 138 that can be in its original position within the valve housing 52. Figure 29 and Figure 30 ) and pressing position ( Figure 31 The valve core 138 has a gas passage 140 for moving between the two fluid valves 12d in the gas-filled configuration. Figure 30 When gas inlet 64 is fluidly connected to gas outlet 66.

[0086] In some examples, valve core 138 has a vent 72 that is fluidly connected to gas passage 140. In some examples, vent 72 can be manually covered. Figure 30 and Figure 31 This isolates the gas passage 140 from the atmosphere 88, or allows the vent 72 to be exposed. Figure 29 This allows the gas passage 140 to be directed to the atmosphere 88.

[0087] The dual-fluid valve 12d also includes a valve seal 142. The valve seal 142 surrounds and is attached to the valve core 138. The valve seal 142 can relax from a more relaxed shape in response to a pressure differential between the gas inlet 64 and the gas outlet 66 exceeding a predetermined threshold (e.g., 0.1 psi). Figure 29 and Figure 31 ) elastically expands into deformable shape ( Figure 30 ).

[0088] Depending on the position of the valve core 138 and whether the vent 72 is covered or exposed, the dual-fluid valve 12d can be selectively configured in a venting configuration. Figure 29 ), inflatable configuration ( Figure 30 ) and flushing configuration ( Figure 31In various configurations, the control of fluid flow through the two-fluid valve 12d is similar to the control described with reference to the two-fluid valve 12a.

[0089] However, the valve seal 142 of the dual-fluid valve 12d includes a fixed end 144, a movable end 146, and a flange 148. In some examples, the valve seal 142 (including the fixed end 144, the movable end 146, and the flange 148) is a seamless monolithic piece to minimize leakage and manufacturing costs. The fixed end 144 is substantially stationary relative to the valve core 138. When referring to two parts, the term "substantially stationary" means that there is no relative sliding, rotation, or translation between the two parts except for some possible deflection, tension, compression, torsion, or other strain. The movable end 146 is flexible and movable relative to the valve core 138, such that the movable end 146 is in a more relaxed shape when the valve seal 142 is in a more relaxed shape. Figure 29 and Figure 31 When the valve seal 142 is in a deformed shape ( ) Figure 30 (When it is closer to the valve core 138)

[0090] Flange 148 is located at the fixed end 144 of valve seal 142 and extends radially from valve core 138, so flange 148, fixed end 144, and valve core 138 can move as a unit. Therefore, flange 148, fixed end 144, and valve core 138 can be in their original positions relative to valve housing 52 in the axial direction 100 ( Figure 29 and Figure 30 ) and pressing position ( Figure 31 Move between ).

[0091] As the valve core 138 moves, the flange 148 slides along the inner surface 84 of the valve housing 52 in a sealing contact. This sealing contact causes any gas 22b flowing from the gas inlet 64 to the gas outlet 66 to flow through the gas passage 140, rather than bypassing the gas passage 140 by flowing over the flange 148. In some examples, the flange 148 has an axial thickness 150 greater than the radial wall thickness 152 of the movable end 146 of the valve seal. This relative thickness ensures that the flange 148 can resist significant pressure differentials while allowing the movable end 146 to flex as needed.

[0092] like Figure 29As shown, when the dual-fluid valve 12d is in the vent configuration, the vent 72 connects the gas passage 140 to the atmosphere 88. This results in insufficient pressure in the gas passage 140 to deform the valve seal 142, thus keeping the valve seal 142 in its more relaxed shape. In its more relaxed shape, the valve seal 142 prevents gas 22b from flowing in either direction between the gas inlet 64 and the gas outlet 66, so almost no gas 22b is delivered to the flexible tubular probe 14. Furthermore, the flange 148 prevents gas 22b from bypassing the valve seal 142.

[0093] like Figure 30 As shown, when the dual-fluid valve 12d is in the inflated configuration, the manually blocked vent 72 allows the pressure in the gas passage 140 to equalize with the pressure in the gas inlet 64. This creates a sufficient pressure differential between the gas passage 140 and the gas outlet 66 to force the valve seal 142 open, allowing gas 22b to flow sequentially from the gas inlet 64 through the gas passage 140, through the deflected valve seal 142, through the gas outlet 66, and out through the distal end 44 of the flexible tubular probe 14.

[0094] like Figure 31 As shown, when the dual-fluid valve 12d is in the flushing configuration, the first set of seals 76 is positioned to fluidly connect the liquid inlet 60 and the liquid outlet 62, thereby allowing liquid 22a to flow sequentially from the liquid inlet 60 through the liquid outlet 62 and out through the distal end 44 of the flexible tubular probe 14. In the flushing configuration, the shoulder 90 of the valve core seals against the valve seat 92, blocking the fluid communication between the gas inlet 64 and the gas outlet 66. This results in the equalization of the pressure differential across the valve seal 142, causing the valve seal 142 to return to its more relaxed shape.

[0095] Figures 32 to 34 An example of a dual-fluid valve 12e is shown. In some examples, the dual-fluid valve 12e includes a valve core 138 that can be in its original position within the valve housing 52. Figure 32 and Figure 33 ) and pressing position ( Figure 34 The valve core 138 has a gas passage 140 for moving between the two fluid valves 12e in the gas-filled configuration. Figure 32 When gas inlet 64 is fluidly connected to gas outlet 66.

[0096] In some examples, valve core 138 has a vent 72 that is fluidly connected to gas passage 140. In some examples, vent 72 can be manually covered. Figure 33 and Figure 34 This isolates the gas passage 140 from the atmosphere 88, or allows the vent 72 to be exposed. Figure 32This allows the gas passage 140 to be directed to the atmosphere 88.

[0097] The dual-fluid valve 12e also includes a valve seal 154. The valve seal 154 surrounds and is attached to the valve core 138. The valve seal 154 can relax from a more relaxed shape in response to a pressure differential between the gas inlet 64 and the gas outlet 66 exceeding a predetermined threshold (e.g., 0.1 psi). Figure 32 and Figure 34 ) elastically expands into deformable shape ( Figure 33 ).

[0098] Depending on the position of the valve core 138 and whether the vent 72 is covered or exposed, the dual-fluid valve 12e can be selectively configured in a venting configuration. Figure 32 ), inflatable configuration ( Figure 33 ) and flushing configuration ( Figure 34 In various configurations, the control of fluid flow through the two-fluid valve 12e is similar to the control described with reference to the two-fluid valves 12a and 12d.

[0099] However, the valve seal 154 of the dual-fluid valve 12e includes a fixed end 156, a movable end 158, and a raised section 160 axially inserted therebetween. The fixed end 156 is substantially stationary relative to the valve core 138. The movable end 158 is flexible and movable relative to the valve core 138, such that the movable end 158 is in a more relaxed shape within the valve seal 154. Figure 32 and Figure 34 When the valve seal 154 is in a deformed shape ( ) Figure 33 When it is closer to the valve core 138, the protruding section 160 sealably engages the inner surface 84 of the valve body. In some examples, the valve seal 154 (including the fixed end 156, the movable end 158, and the protruding section 160) is a seamless integral part to minimize leakage and manufacturing costs.

[0100] As the valve core 138 moves, the protruding section 160 slides along the inner surface 84 of the valve housing 52 in a sealing contact. This sealing contact causes any gas 22b flowing from the gas inlet 64 to the gas outlet 66 to flow through the gas passage 140, rather than around the gas passage 140 around the protruding section 160.

[0101] like Figure 32As shown, when the dual-fluid valve 12e is in the vent configuration, the vent 72 connects the gas passage 140 to the atmosphere 88. This results in insufficient pressure in the gas passage 140 to deform the valve seal 154, thus keeping the valve seal 154 in its more relaxed shape. In its more relaxed shape, the valve seal 154 prevents gas 22b from flowing in either direction between the gas inlet 64 and the gas outlet 66, so almost no gas 22b is delivered to the flexible tubular probe 14. Furthermore, the raised section 160 prevents gas 22b from bypassing the valve seal 154.

[0102] like Figure 33 As shown, when the dual-fluid valve 12e is in the inflated configuration, the manually blocked vent 72 allows the pressure in the gas passage 140 to equalize with the pressure in the gas inlet 64. This creates a sufficient pressure differential between the gas passage 140 and the gas outlet 66 to force open the valve seal 154, allowing gas 22b to flow sequentially from the gas inlet 64 through the gas passage 140, through the deflected valve seal 154, through the gas outlet 66, and out through the distal end 44 of the flexible tubular probe 14.

[0103] like Figure 34 As shown, when the dual-fluid valve 12e is in the flushing configuration, the first set of seals 76 is positioned to fluidly connect the liquid inlet 60 and the liquid outlet 62, thereby allowing liquid 22a to flow sequentially from the liquid inlet 60 through the liquid outlet 62 and out through the distal end 44 of the flexible tubular probe 14. In the flushing configuration, the shoulder 90 of the valve core seals against the valve seat 92, blocking the fluid communication between the gas inlet 64 and the gas outlet 66. This results in the equalization of the pressure differential across the valve seal 154, causing the valve seal 154 to return to its more relaxed shape.

[0104] Figures 34 to 36 This demonstrates that it can be selectively configured into a ventilation configuration. Figure 35 ), inflatable configuration ( Figure 36 ) and flushing configuration ( Figure 37 Examples of dual-fluid valves 12f. In some examples, the dual-fluid valve 12f includes a valve body 52, a sleeve 162 fixed within the valve body 52, a valve core 164 extending through the sleeve 162, and a valve seal 166. In some examples, the combination of the valve body 52 and the sleeve 162 is a seamless integral piece.

[0105] In the example shown, point 168 schematically represents any interface between valve body 52 and sleeve 162. Some examples of interfaces represented by point 168 include O-rings, sealants, adhesives, interference fits between valve body 52 and sleeve 162, threaded connections between valve body 52 and sleeve 162, chemical fusion joints, ultrasonic welded joints, or integral seamless connections between valve body 52 and sleeve 162.

[0106] In the example where point 168 represents a seamless integral connection, the combination of valve housing 52 and sleeve 162 is a seamless monolithic piece. In other examples, valve housing 52 and sleeve 162 are discrete components to facilitate the assembly of the dual-fluid valve 12f.

[0107] In some examples, the valve core 164 is elongated in the axial direction 100. Some examples of the valve core 164 include a vent 72, which can be manually covered by the user 70. Figure 36 and Figure 37 ) or expose the vent ( Figure 35 In some examples, the valve core 164 is movable relative to the sleeve 162 in the axial direction 100. In some examples, the valve core 164 is selectively moved to its original position 65. Figure 34 ), the partial compression position 170 for the inflatable configuration ( Figure 36 ), and the fully depressed position 172 for flushing configuration ( Figure 37 ).

[0108] In some examples, the valve seal 166 is an elastomeric tube including a first end 174, a second end 176, and a radially expandable section 178 therebetween. The valve seal 166 has a seal length 180 as measured from the first end 174 to the second end 176. The first end 174 is attached to the valve core 164, and therefore the first end 174 is substantially stationary relative to the valve core 164. The second end 176 is attached to the sleeve 162, and therefore the second end 176 is relatively stationary relative to the sleeve 162 and the valve body 52.

[0109] Axial movement of valve core 164 relative to valve housing 52 changes the length 180 of valve seal 166. When valve core 164 is in its original position ( Figure 35 When the valve core 164 is in the fully depressed position, the length of the seal 180 is shorter. Figure 37 When the valve core 164 is in the partially depressed position, the length of the seal 180 is longer. Figure 36 When the length of the seal is 180, it is at the middle length.

[0110] As the length of the seal 180 decreases, the radially expandable section 178 expands radially. Conversely, as the length of the seal 180 increases, the radially expandable section 178 retracts radially. In some examples, such as Figure 35 As shown, when the valve core 164 is in its original position 65, the radially expandable section 178 sealably engages the inner surface 84 of the valve housing. When the valve core 164 is in the partially depressed position 170... Figure 36 ) or fully press down position 172 ( Figure 37 When ), the radially expandable section 178 is separated from the inner surface 84.

[0111] In some examples, the radially expandable section 178 has a thinner material wall thickness 182 than the material wall thickness 184 of the first end 174 and the second end 176. This helps ensure that the valve seal 166 expands along the valve seal 166 in the desired area. In some examples, the first end 174 of the valve seal extends on the shoulder 186 on the valve core 164, so that when the dual-fluid valve 12f is in the flush configuration ( Figure 37 When the valve seal 166 is relatively soft, it provides a more compliant sealing surface between the shoulder 186 and the valve seat 92 on the valve housing 52.

[0112] In some examples, when valve seal 166 is in Figure 35 When the shape shown is such that the radially expandable section 178 is in a relatively relaxed state, the valve spool 164 moves from its original position 65 to its fully depressed position 172, stretching the valve seal 166 in the axial direction 100. In some examples where the valve spool 164 stretches the valve seal 166 as it is depressed, the axial elasticity of the valve seal 166 provides a restoring force that can be used to push the valve spool 164 back to its original position 65. In examples where the restoring force is so strong that the spring 80 is no longer needed and can be omitted, a surprising and unexpected result is achieved. In other words, the valve seal 166 can also be used as a return spring.

[0113] In other examples, when valve seal 166 is in Figure 37 When the shape is shown, the radially expandable section 178 is in a relatively relaxed state. In such an example, the valve core 164 moving from the fully depressed position 172 to the original position 65 will compress the valve seal 166 in the axial direction 100.

[0114] In other examples, when valve seal 166 is in Figure 36When the shape shown is such that the radially expandable section 178 is in a relatively relaxed state, the valve core 164 moves from the partially depressed position 170 to the original position 65, compressing the valve seal 166 in the axial direction 100, while moving from the partially depressed position 170 to the fully depressed position 172, stretching the valve seal 166 in the axial direction 100.

[0115] like Figure 35 As shown, when the dual-fluid valve 12f is in the vented configuration (with the valve core 164 in its original position 65), the radially expandable section 178 of the seal sealably engages the inner surface 84 of the valve housing, thereby preventing gas 22b from flowing in either direction between the gas inlet 64 and the gas outlet 66. Additionally, the vent 72 connects the gas inlet 64 to the atmosphere 76, minimizing the pressure in the gas inlet 64 and thus reducing the likelihood that gas 22b in the gas inlet 64 could force itself through the valve seal 166. Therefore, almost no gas 22b is delivered to the flexible tubular probe 14.

[0116] like Figure 36 As shown, when the dual-fluid valve 12f is in the inflated configuration (where the valve core 164 is in the partially depressed position 170), the manually blocked vent 72 prevents gas 22b in the gas inlet 64 from escaping to the atmosphere 88. Conversely, when the valve core 164 is partially depressed, the radially expandable section 178 of the valve seal retracts from the inner surface 84 of the valve housing. This forms an annular gap 188 that allows gas 22b to flow from the gas inlet 64 to the gas outlet 66 and out through the distal end 44 of the flexible tubular probe 14.

[0117] like Figure 37 As shown, when the dual-fluid valve 12f is in the flushing configuration (with the valve core 164 in the fully depressed position 172), the first set of seals 76 is positioned to fluidly connect the liquid inlet 60 and the liquid outlet 62, thereby allowing liquid 22a to flow sequentially from the liquid inlet 60 through the liquid outlet 62 and out through the distal end 44 of the flexible tubular probe 14. In the flushing configuration, the shoulder 186 of the valve core seals against the valve seat 92, blocking the fluid communication between the gas inlet 64 and the gas outlet 66. This restricts the flow of gas 22b to the flexible tubular probe 14.

[0118] It should be noted that valve seal 166 provides a non-sliding, airtight seal between the moving valve core 164 and the valve housing 52. A surprising and unexpected result of this design is that the sliding second seal 78 used in dual-fluid valves 12a-e is no longer required, and can be omitted in dual-fluid valve 12f, while providing excellent sealing at a lower cost.

[0119] It should also be noted that, Figures 2 to 37 Any of the seals shown can be made of any suitable sealing material. Some exemplary sealing materials include silicone resins, TPE (thermoplastic elastomers), TPU (thermoplastic polyurethanes), TPR (thermoplastic rubbers), TPC (thermoplastic copolyesters), PTFE (polytetrafluoroethylene), VersaFlex, neoprene rubber, latex, nitrile, and any other flexible or rubber-like material known to those skilled in the art. In some examples, the sealing material has a hardness of about 50.

[0120] Some examples of dual-fluid valves 12a-f can be defined as described in Examples 1 through 29 below.

[0121] Example-1 A dual-fluid valve for use in an endoscope, the dual-fluid valve being selectively configured into an inflation configuration and a flushing configuration, the dual-fluid valve comprising: a valve housing having an inner surface at least partially defining an interior of the housing, the valve housing at least partially defining a gas inlet and a gas outlet; a valve core, the valve core being elongated to define an axial direction, the valve core extending into the interior of the housing, the valve core and the inner surface defining an annular gap therebetween; and a valve seal extending radially across the annular gap between the valve core and the inner surface, the valve seal comprising a plurality of flaps elastically flexible between a deformed shape and a more relaxed shape, the plurality of flaps being in the deformed shape when the dual-fluid valve is in the inflation configuration to fluidly connect the gas inlet and the gas outlet, and the plurality of flaps being in the more relaxed shape when the dual-fluid valve is in the flushing configuration to block fluid communication between the gas inlet and the gas outlet.

[0122] Example-2 As described in Example-1, the dual-fluid valve includes an inner periphery and an outer periphery, the inner periphery being attached to the valve core, the outer periphery being spaced apart from the inner surface when the plurality of flaps are in the deformed shape, and the outer periphery engaging the inner surface when the flaps are in the more relaxed shape.

[0123] Example-3As described in Example-1, in a dual-fluid valve, the plurality of flaps are distributed in a circular pattern around the valve core, each of the plurality of flaps including an inlet edge and an outlet edge, the inlet edge of each flap covering the outlet edge of an adjacent flap, the inlet edge of each flap being exposed to the gas inlet, and the outlet edge of each flap being exposed to the gas outlet, the plurality of flaps overlapping and slidingly contacting each other at the inlet edge and the outlet edge to facilitate the plurality of flaps flexing between the deformed shape and the more relaxed shape.

[0124] Example-4 As described in Example-1, the dual-fluid valve has a valve housing that at least partially defines a liquid inlet and a liquid outlet, a valve core that is movable relative to the valve housing in the axial direction between an initial position and a depressed position, wherein the valve core, when in the depressed position, configures the dual-fluid valve into the flushing configuration to establish fluid communication between the liquid inlet and the liquid outlet, wherein the valve core, when in the initial position, blocks the fluid communication between the liquid inlet and the liquid outlet, and wherein the valve seal moves with the valve core in the axial direction as the valve core moves between the initial position and the depressed position.

[0125] Example-5 As described in Example-4, the dual-fluid valve has a valve core that at least partially defines a vent that can be manually selectively covered and exposed. When exposed, the vent connects the gas inlet in fluid communication with the atmosphere. When covered, the vent blocks the fluid communication between the gas inlet and the atmosphere. When the valve core is in the original position, the dual-fluid valve is configured to be in a venting configuration when the vent is exposed.

[0126] Example-6 As described in Example-1, the dual-fluid valve includes an inner periphery attached to the valve core and an outer periphery engaging the inner surface of the valve housing, wherein the plurality of lobes define a plurality of slits spaced apart from the inner and outer peripheries, each of the plurality of slits being more open when the plurality of lobes are in the deformed shape than when the plurality of lobes are in the more relaxed shape.

[0127] Example-7 As described in Example-1, the dual-fluid valve includes an inner periphery attached to the valve core and an outer periphery engaging the inner surface of the valve housing. The plurality of lobes are divided into multiple groups such that each group defines a cluster of intersecting slits spaced apart from the inner and outer peripheries, each cluster of intersecting slits being more open when the plurality of lobes are in the deformed shape than when the plurality of lobes are in the more relaxed shape.

[0128] Example-8 A dual-fluid valve for use in an endoscope, the dual-fluid valve being selectively configured into an inflation configuration and a flushing configuration, the dual-fluid valve comprising: a valve housing having an inner surface at least partially defining an interior of the housing, the valve housing at least partially defining a gas inlet and a gas outlet; a valve core, the valve core being elongated to define an axial direction, the valve core extending into the interior of the housing, the valve core and the inner surface defining an annular gap therebetween; and a valve seal extending radially across the annular gap between the valve core and the inner surface, the valve seal being elastically flexible between a deformable shape and a more relaxed shape, the valve seal being elastically flexible between the deformable shape and a more relaxed shape when the dual-fluid valve is in the inflation configuration. The valve seal is in the deformed shape to fluidly connect the gas inlet and the gas outlet; when the dual-fluid valve is in the closed configuration, the valve seal is in the more relaxed shape to block the fluid communication between the gas inlet and the gas outlet; and a plurality of concentric ridges are located on the surface of the valve seal, the plurality of concentric ridges extend around the valve core and are arranged substantially perpendicular to the axial direction; the plurality of concentric ridges are distributed along an axial length that is greater when the valve seal is in the deformed shape than when it is in the more relaxed shape, the valve seal having an outer radial periphery that is greater when it is in the more relaxed shape than when it is in the deformed shape.

[0129] Example-9 As described in Example-8, the dual-fluid valve has a surface comprising a plurality of progressive steps forming a plurality of concentric ridges.

[0130] Example-10 As in Example-8, the surface of the valve seal is corrugated to form the plurality of concentric ridges.

[0131] Example-11 As described in Example-8, the dual-fluid valve has a valve housing that at least partially defines a liquid inlet and a liquid outlet, a valve core that is movable relative to the valve housing in the axial direction between an initial position and a depressed position, wherein when the valve core is in the depressed position, fluid communication is established between the liquid inlet and the liquid outlet to configure the dual-fluid valve in the flushing configuration, and when the valve core is in the initial position, fluid communication between the liquid inlet and the liquid outlet is blocked, and when the valve core moves between the initial position and the depressed position, the valve seal moves with the valve core in the axial direction.

[0132] Example-12As described in Example-11, the dual-fluid valve has a valve core that at least partially defines a vent that can be manually selectively covered and exposed, the vent connecting the gas inlet in fluid communication with the atmosphere when exposed, and blocking fluid communication between the gas inlet and the atmosphere when covered, and the dual-fluid valve being configured in a venting configuration when the vent is exposed while the valve core is in the original position.

[0133] Example-13 A dual-fluid valve for use in an endoscope, the dual-fluid valve being selectively configured into an inflation configuration and a flushing configuration, the dual-fluid valve comprising: a valve housing having an inner surface at least partially defining an interior of the housing, the valve housing at least partially defining a gas inlet and a gas outlet 4; a valve core, the valve core being elongated to define an axial direction, the valve core extending into the interior of the housing, the valve core defining a gas passage between the gas inlet and the gas outlet 4; a valve seal surrounding and attached to the valve core, the valve seal being capable of elastically expanding from a more relaxed shape to a deformable shape in response to a pressure difference between the gas inlet and the gas outlet exceeding a predetermined threshold; when the dual-fluid valve is in the inflation configuration, the valve seal is in the deformable shape to open the gas passage and thereby fluidly connecting the gas inlet and the gas outlet; and when the dual-fluid valve is in the flushing configuration, the valve seal is in the more relaxed shape to block the gas passage and thereby block the fluid communication between the gas inlet and the gas outlet.

[0134] Example-14 The dual-fluid valve as described in Example-13, wherein the valve seal includes a fixed end that is substantially stationary relative to the valve core, and the valve seal includes a movable end that is closer to the valve core when the valve seal is in the more relaxed shape than when the valve seal is in the deformed shape.

[0135] Example-15 The dual-fluid valve as described in Example-13, wherein the valve seal further includes a flange extending radially from the valve core, the valve core being movable relative to the valve housing in the axial direction between an original position and a depressed position, and the flange slidingly contacting the inner surface of the valve housing when the valve core moves between the original position and the depressed position.

[0136] Example-16The dual-fluid valve as described in Example-13, wherein the valve seal comprises: a fixed end that is substantially stationary relative to the valve core; a movable end that is closer to the valve core when the valve seal is in the more relaxed shape than when the valve seal is in the deformed shape; and a flange that extends radially from the valve core and contacts the inner surface of the valve housing, and further wherein the valve seal having the fixed end, the movable end and the flange is a seamless integral part.

[0137] Example-17 The dual-fluid valve as described in Example-16, wherein the flange has an axial thickness greater than the radial wall thickness of the valve seal at the movable end.

[0138] Example-18 As described in Example-13, the dual-fluid valve includes a fixed end, a movable end, and a raised section axially inserted therebetween. The fixed end is substantially stationary relative to the valve core. The movable end is closer to the valve core when the valve seal is in the more relaxed shape than when the valve seal is in the deformed shape. The raised section engages the inner surface of the valve housing.

[0139] Example-19 The dual-fluid valve as described in Example-18, wherein the valve seal having the fixed end, the movable end, and the raised section is a seamless integral part.

[0140] Example-20 The dual-fluid valve as described in Example-13, wherein the valve housing at least partially defines a liquid inlet and a liquid outlet, the valve spool being movable relative to the valve housing in an axial direction between an initial position and a depressed position, the valve spool establishing fluid communication between the liquid inlet and the liquid outlet when in the depressed position, and blocking fluid communication between the liquid inlet and the liquid outlet when in the initial position.

[0141] Example-21 As described in Example-20, the dual-fluid valve has a valve core that at least partially defines a vent that can be manually selectively covered and exposed, the vent connecting the gas inlet in fluid communication with the atmosphere when exposed, and blocking fluid communication between the gas inlet and the atmosphere when covered, and the dual-fluid valve being configured in a venting configuration when the vent is exposed while the valve core is in the original position.

[0142] Example-22A dual-fluid valve for use in an endoscope, the dual-fluid valve being selectively configured into an inflation configuration and a flushing configuration, the dual-fluid valve comprising: a valve housing having an inner surface at least partially defining a housing interior, the valve housing at least partially defining a gas inlet and a gas outlet; a sleeve supported by the valve housing within the housing interior; and a valve core, the valve core being elongated to define an axial direction, the valve core extending through the sleeve and being selectively movable relative to the sleeve in the axial direction to an original position and a partially depressed position for the inflation configuration. and a fully depressed position for the flushing configuration; and a valve seal comprising a first end, a second end, and a radially expandable section therebetween; the first end being substantially stationary relative to the sleeve, the second end being relatively stationary relative to the valve core, the radially expandable section engaging the inner surface of the valve housing when the valve core is in the original position, spaced apart from the inner surface when the valve core is in the partially depressed position, and spaced apart from the inner surface when the valve core is in the fully depressed position.

[0143] Example-23 As described in Example-22, in a dual-fluid valve, in response to the valve core moving from the partially depressed position to the original position, the radially expandable section expands radially outward against the inner surface of the valve housing.

[0144] Example-24 The dual-fluid valve as described in Example-22, wherein the combination of the sleeve and the valve body is a seamless integral part.

[0145] Example 25: A dual-fluid valve as described in Example 22, wherein each of the first end, the second end, and the radially expandable section has a material wall thickness, and the material wall thickness of each of the first end and the second end is greater than the material wall thickness of the radially expandable section.

[0146] Example-26 As described in Example-22, the dual-fluid valve has a valve core that defines a vent that can be manually selectively covered and exposed. When the vent is exposed, the vent connects the gas inlet in fluid communication with the atmosphere, and when the vent is covered, it prevents the gas inlet from communicating with the atmosphere.

[0147] Example-27As described in Example-22, the dual-fluid valve has a valve housing that at least partially defines an inlet and an outlet, wherein when the valve core is in the fully depressed position, the inlet and the outlet are fluidly connected, and when the valve core is in the partially depressed position, the valve core blocks the fluid communication between the inlet and the outlet.

[0148] Example-28 A dual-fluid valve for use in an endoscope, the dual-fluid valve being selectively configured in an inflation configuration to deliver gas through the valve and in a flushing configuration to deliver liquid through the valve, the dual-fluid valve comprising: a valve housing; a valve core extending into the valve housing and selectively movable relative to the valve housing to an original position, a partially depressed position for the inflation configuration, and a fully depressed position for the flushing configuration; and a valve seal including a first end and a second end, the valve seal having a seal length as measured from the first end to the second end, the first end being substantially stationary relative to the valve housing, the second end being substantially stationary relative to the valve core, the seal length being longer when the valve core is in the fully depressed position, and shorter when the valve core is in the original position.

[0149] Example-29 As described in Example 28, the valve seal includes a radially expandable section located between the first end and the second end, wherein the radially expandable section engages the valve housing when the valve spool is in the original position, the radially expandable section is spaced apart from the valve housing when the valve spool is in the partially depressed position, and the radially expandable section is spaced apart from the valve housing when the valve spool is in the fully depressed position.

[0150] This disclosure should not be considered limited to the examples described above. Various modifications, equivalent processes, and numerous structures to which this disclosure may be applied will be apparent to those skilled in the art upon reading this specification.

Claims

1. A dual-fluid valve for use in an endoscope, the dual-fluid valve being selectively configured into an inflation configuration and a flushing configuration, the dual-fluid valve comprising: A valve housing having an inner surface that at least partially defines an interior of the housing, and the valve housing at least partially defines a gas inlet and a gas outlet 4; A valve core, which is elongated to define an axial direction, extends into the interior of the housing, and the valve core and the inner surface define an annular gap therebetween; as well as A valve seal extending radially across the annular gap between the valve core and the inner surface, the valve seal comprising a plurality of flaps that are elastically flexible between a deformed shape and a more relaxed shape. When the dual-fluid valve is in the inflation configuration, the plurality of flaps are in the deformed shape to fluidly connect the gas inlet and the gas outlet. When the dual-fluid valve is in the flushing configuration, the plurality of flaps are in the more relaxed shape to block the fluid communication between the gas inlet and the gas outlet.

2. The dual-fluid valve as described in claim 1, wherein, The valve seal includes an inner periphery and an outer periphery, the inner periphery being attached to the valve core, the outer periphery being spaced apart from the inner surface when the plurality of flaps are in the deformed shape, and the outer periphery engaging the inner surface when the flaps are in the more relaxed shape.

3. The dual-fluid valve as claimed in any one of claims 1 or 2, wherein, The plurality of lobes are distributed in a circular pattern around the valve core. Each of the plurality of lobes includes an inlet edge and an outlet edge. The inlet edge of each lobe covers the outlet edge of the adjacent lobe. The inlet edge of each lobe is exposed to the gas inlet, and the outlet edge of each lobe is exposed to the gas outlet. The plurality of lobes overlap and slide in contact with each other at the inlet edge and the outlet edge to facilitate the flexing of the plurality of lobes between the deformed shape and the more relaxed shape.

4. The dual-fluid valve as described in any one of claims 1, 2, or 3, wherein, The valve housing at least partially defines a liquid inlet and a liquid outlet, the valve core is movable relative to the valve housing in the axial direction between an initial position and a depressed position, the valve core in the depressed position configuring the dual-fluid valve into the flushing configuration to establish fluid communication between the liquid inlet and the liquid outlet, the valve core in the initial position blocking the fluid communication between the liquid inlet and the liquid outlet, and the valve seal moving with the valve core in the axial direction as the valve core moves between the initial position and the depressed position.

5. The dual-fluid valve as described in claim 4, wherein, The valve core at least partially defines a vent that can be manually selectively covered and exposed, the vent connecting the gas inlet to the atmosphere in fluid communication when exposed, and blocking the fluid communication between the gas inlet and the atmosphere when covered, and the dual-fluid valve being configured in a venting configuration when the vent is exposed while the valve core is in the original position.

6. The dual-fluid valve as described in any one of claims 1 to 5, wherein, The valve seal includes an inner periphery attached to the valve core and an outer periphery engaging the inner surface of the valve housing. The plurality of lobes define a plurality of slits spaced apart from the inner and outer peripheries, each of the plurality of slits being more open when the plurality of lobes are in the deformed shape than when the plurality of lobes are in the more relaxed shape.

7. The dual-fluid valve according to any one of claims 1 to 6, wherein, The valve seal includes an inner periphery attached to the valve core and an outer periphery engaging the inner surface of the valve housing. The plurality of lobes are divided into multiple groups such that each group defines a cluster of intersecting slits spaced apart from the inner and outer peripheries, each cluster of intersecting slits being more open when the plurality of lobes are in the deformed shape than when the plurality of lobes are in the more relaxed shape.

8. A dual-fluid valve for use in an endoscope, the dual-fluid valve being selectively configured into an inflation configuration and a flushing configuration, the dual-fluid valve comprising: A valve housing having an inner surface that at least partially defines an interior of the housing, and the valve housing at least partially defines a gas inlet and a gas outlet; A valve core, which is elongated to define an axial direction, extends into the interior of the housing, and the valve core and the inner surface define an annular gap therebetween; A valve seal extends radially across the annular gap between the valve core and the inner surface. The valve seal is elastically flexible between a deformed shape and a more relaxed shape. When the dual-fluid valve is in the inflated configuration, the valve seal is in the deformed shape to fluidly connect the gas inlet and the gas outlet. When the dual-fluid valve is in the closed configuration, the valve seal is in the more relaxed shape to block the fluid communication between the gas inlet and the gas outlet. as well as Multiple concentric ridges are located on the surface of the valve seal, extending around the valve core and arranged substantially perpendicular to the axial direction; the multiple concentric ridges are distributed along an axial length that is greater when the valve seal is in the deformed shape than when it is in the more relaxed shape, and the valve seal has an outer radial periphery that is greater when it is in the more relaxed shape than when it is in the deformed shape.

9. The dual-fluid valve as claimed in claim 8, wherein, The surface of the valve seal includes a plurality of progressively increasing steps, which form a plurality of concentric ridges.

10. The dual-fluid valve as claimed in any one of claims 8 or 9, wherein, The surface of the valve seal is wavy to form the plurality of concentric ridges.

11. The dual-fluid valve as claimed in any one of claims 8, 9, or 10, wherein, The valve housing at least partially defines a liquid inlet and a liquid outlet, the valve core is movable relative to the valve housing in the axial direction between an initial position and a depressed position, the valve core in the depressed position establishing fluid communication between the liquid inlet and the liquid outlet to configure the dual-fluid valve in the flushing configuration, the valve core in the initial position blocking the fluid communication between the liquid inlet and the liquid outlet, and the valve seal moving with the valve core in the axial direction as the valve core moves between the initial position and the depressed position.

12. The dual-fluid valve as claimed in claim 11, wherein, The valve core at least partially defines a vent that can be manually selectively covered and exposed, the vent connecting the gas inlet to the atmosphere in fluid communication when exposed, and blocking the fluid communication between the gas inlet and the atmosphere when covered, and the dual-fluid valve being configured in a venting configuration when the vent is exposed while the valve core is in the original position.

13. A dual-fluid valve for use in an endoscope, the dual-fluid valve being selectively configured into an inflation configuration and a flushing configuration, the dual-fluid valve comprising: A valve housing having an inner surface that at least partially defines an interior of the housing, and the valve housing at least partially defines a gas inlet and a gas outlet 4; A valve core, which is elongated to define an axial direction, extends into the housing and defines a gas passage between the gas inlet and the gas outlet 4; A valve seal that surrounds and is attached to the valve core, the valve seal being able to elastically expand from a more relaxed shape to a deformable shape in response to a pressure difference between the gas inlet and the gas outlet exceeding a predetermined threshold. When the dual-fluid valve is in the inflation configuration, the valve seal is in the deformed shape to open the gas passage, thereby fluidly connecting the gas inlet and the gas outlet; and When the dual-fluid valve is in the flushing configuration, the valve seal is in the more relaxed shape to block the gas passage and thereby block the fluid communication between the gas inlet and the gas outlet.

14. The dual-fluid valve as claimed in claim 13, wherein, The valve seal includes a fixed end that is substantially stationary relative to the valve core, and a movable end that is closer to the valve core when the valve seal is in the more relaxed shape than when the valve seal is in the deformed shape.

15. The dual-fluid valve as claimed in any one of claim 13 or claim 14, wherein, The valve seal further includes a flange extending radially from the valve core, the valve core being movable relative to the valve housing in the axial direction between an original position and a depressed position, and the flange slidingly contacting the inner surface of the valve housing when the valve core moves between the original position and the depressed position.

Images