Medical valves

Abstract

A medical valve may include a valve stem and an operating portion. The operating portion may include a fixed portion, a movable portion movable relative to the fixed portion and fixed relative to the valve stem, a seal disposed between the fixed portion and the movable portion, and a biasing member. Movement of the movable portion in a first direction may cause the biasing member to deform, such that a restoring force of the biasing member causes the movable portion to move in a second direction opposite to the first direction. Friction between the seal and one of the fixed portion and the movable portion resists movement of the movable portion in the second direction.

Description

[0001] Cross-references to related literature

[0002] This application claims priority to U.S. Provisional Application No. 62 / 862,893, filed June 18, 2019, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates generally to valves for medical devices, and in particular endoscopes. Background Art

[0004] Endoscopes include functions for delivering fluids (including air and water) and suction to the surgical site. Tubing for delivering fluids and / or suction extends from the endoscope's handle, through the endoscope's sheath, and to the distal end of the endoscope. During surgery, body fluids, tissue, or other material can accumulate in the tubing, sometimes leading to blockage. To facilitate reprocessing of reusable endoscopes between procedures, preconditioning is performed in the endoscopy suite. For example, after the endoscope is removed from the patient, water or other fluid is flushed through the tubing to clear debris from the air / water and / or suction tubing. One option for accomplishing this preconditioning is a reusable purge valve. After the endoscope is removed from the patient, the purge valve can be inserted into the endoscope's air / water valve cartridge. The operator can then press the purge valve button to flush the endoscope's air and / or water channels for a predetermined period of time (e.g., 30 seconds) before further reprocessing the endoscope. This purge may require active intervention by the operator. Reusable purge valves themselves must be cleaned between uses, which can increase reprocessing costs. Therefore, there is a need for valves that can perform a purge function. Summary of the Invention

[0005] In one example, a medical valve may include a valve stem and an operating portion. The operating portion may include a fixed portion and a movable portion. The movable portion is movable relative to the fixed portion and fixed relative to the valve stem. A seal may be provided between the fixed portion and the movable portion. The operating portion may further include a biasing member. Movement of the movable portion in a first direction may cause the biasing member to deform, such that a restoring force of the biasing member causes the movable portion to move in a second direction opposite to the first direction. Friction between the seal and one of the fixed portion and the movable portion resists movement of the movable portion in the second direction.

[0006] Any of the medical valves disclosed herein may include any of the following features. The biasing member may be a spring. The movable portion may be movable in a first direction from a first configuration to a second configuration. The relationship between the friction force and the restoring force may be such that, after the movable portion transitions from the first configuration to the second configuration, the movable portion automatically moves in the second direction to return to the first configuration. The radially outer surface of the valve stem may include a first opening and a second opening. The valve stem may include a cavity extending along the longitudinal axis of the valve. The cavity may be in fluid communication with the first opening and the second opening. A proximal seal, a one-way seal, and three distal seals may be disposed on the outer surface of the valve stem. The first opening may be between the proximal seal and the one-way seal. The second opening may be between a first distal seal of the three distal seals and a second distal seal of the three distal seals. The valve may be movable in a proximal direction and a distal direction relative to a valve cylinder receiving the valve. The valve may be rotatable about the longitudinal axis of the valve and relative to the valve cylinder receiving the valve. The first rotatable seal and the second rotatable seal may be disposed on the valve stem. In a first configuration of the valve, the first opening in the first rotatable seal and the second opening in the second rotatable seal may face a first direction. In a second configuration of the valve, the first opening and the second opening may face a second direction different from the first direction. The valve may further include an O-ring seal between the first and second rotatable seals. The first opening may be aligned with the first opening in the radially outer surface of the valve stem. The second opening may be aligned with the second opening in the radially outer surface of the valve stem. Each of the first and second rotatable seals may include a recessed recess that extends partially around the outer circumference of the rotatable seal. The first opening may be within the recessed recess of the first seal. The second opening may be within the recessed recess of the second seal. The movable portion may include an edge that extends between the inner cylindrical portion and the outer cylindrical portion of the fixed portion. The fixed portion may include mating features for mating with the valve barrel of an endoscope. The valve stem may be a single, unitary structure formed from a single material.

[0007] In another example, a medical valve may include a movable portion movable between a first configuration and a second configuration; a fixed portion, a seal disposed between the fixed portion and the movable portion and providing friction between the fixed portion and the movable portion; and a spring. Transitioning the movable portion from the first configuration to the second configuration may deform the spring. The deformed spring may exert a restoring force, urging the movable portion to return to the first configuration. The relationship between the friction force and the restoring force may be such that, after the movable portion transitions from the first configuration to the second configuration, the movable portion automatically returns to the first configuration after a predetermined period of time.

[0008] Any of the medical valves disclosed herein may include any of the following features: The valve may be movable in a proximal direction and a distal direction relative to a valve cylinder receiving the valve. The valve may be rotatable about a longitudinal axis of the valve and relative to the valve cylinder receiving the valve.

[0009] A method for cleaning an endoscope may include applying a force to a valve to transition the valve from a first configuration in which water is not delivered to an air passage to a second configuration in which water is delivered to the air passage, and releasing the force. After the force is released, the valve may continue to deliver water to the air passage for a period of time and then automatically transition back to the first configuration.

[0010] Any of the methods disclosed herein may include the following steps or aspects. The valve may include a movable portion; a fixed portion; a seal disposed between the fixed portion and the movable portion and providing friction between the fixed portion and the movable portion; and a spring. Transitioning the movable portion from a first configuration to a second configuration may deform the spring. The deformed spring may exert a restoring force, urging the movable portion to return to the first configuration. The relationship between the friction force and the restoring force may be such that, after the movable portion transitions from the first configuration to the second configuration, the movable portion automatically returns to the first configuration after a certain period of time.

[0011] It will be understood that the foregoing general description and the following detailed description are merely exemplary and explanatory of the invention as claimed, and are not intended to be restrictive. As used herein, the terms "comprise," "include," or any other variations thereof are intended to encompass non-exclusive inclusions, such that a process, method, article, or apparatus that includes a list of elements may include not only those elements, but may include other elements that are not explicitly listed or are not inherent to such process, method, article, or apparatus. The term "exemplary" is used in the sense of "example" rather than "model." As used herein, the term "proximal" refers to a direction closer to a surface used by an operator to operate a valve (e.g., a button), and the term "distal" refers to a direction away from a surface used by an operator to operate a valve (e.g., a button). Although endoscopes are referenced herein, references to endoscopes or endoscopic examinations should not be construed as limiting the possible applications of the disclosed aspects. For example, the disclosed aspects may be used with duodenoscopes, bronchoscopes, ureteroscopes, colonoscopes, catheters, diagnostic or therapeutic tools or devices, or other types of medical devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate examples of the invention and, together with the description, serve to explain the principles of the invention.

[0013] Figure 1A and Figure 1B A cross-sectional view of a first exemplary valve is shown.

[0014] Figure 2A and Figure 2B A cross-sectional view of a second exemplary valve is shown.

[0015] Figures 3A-3D Shows that Figure 2A and 2B An exemplary seal for use with a second exemplary valve. DETAILED DESCRIPTION

[0016] The valve can be configured to provide a flushing function to the air channel of an endoscope. In at least some embodiments, the valve can be suitable for single use and, therefore, disposable. In a first configuration, the valve can provide no air or water flow to the air and / or water channels of the endoscope. In a second configuration, the valve can provide only water flow to the air channel of the endoscope. The valve can include features that, after the valve transitions from the first configuration to the second configuration, retain the valve in the second configuration for a predetermined time, such as the time specified in a flushing protocol for flushing the air valve. Thus, the valve can be in the second, flushing configuration for a predetermined time without active user interaction, allowing the user to perform other tasks while flushing the air channel of the endoscope. After the predetermined time, the valve can automatically transition from the second configuration back to the first configuration.

[0017] Figures 1A-1B A cross-sectional view of the first exemplary purge valve 10 is shown in the valve cartridge 39 . Figure 1A A first configuration of the valve 10 is shown, Figure 1B A second configuration of the valve 10 is shown. The valve cylinder 39 can have a water inlet A, a water outlet B, an air inlet C, and an air outlet D. The water inlet A can be in fluid communication with a source of water or other liquid (e.g., water, cleaning solution, air, other gases, or a combination thereof). The water outlet B can be in fluid communication with a water channel of an endoscope (not shown), which can extend from the proximal end of the endoscope to the distal end of the endoscope. During medical surgery, the water channel can be used to deliver water to the surgical site. The air inlet C can be in fluid communication with a source of air or other fluid (e.g., air, other gases, water or cleaning solution, or a combination thereof). The air outlet D can be in fluid communication with the air channel of the endoscope. During medical surgery, the air channel can be used to deliver air at the surgical site.

[0018] The valve 10 can have a proximal end 12 and a distal end 14. A valve stem 16 can extend from the proximal end 12 to the distal end 14. A cap 18 (which can be the operating portion of the valve 10) can be disposed at the proximal end 12. The valve stem 16 can be a single, unitary structure formed of a single, continuous material, and can be made of a metal (such as stainless steel, titanium, aluminum, etc.), a polymer (such as polycarbonate, ABS, HDPE, nylon, PEEK, thermoplastics, plastics, etc.), or any other suitable material. Depending on the material used, the valve stem 16 can be machined, injection molded, extruded (via, for example, 3D printing), or otherwise formed. The valve stem 16 can be formed of a transparent thermoplastic so that certain portions of the interior of the valve stem 16 can be visible through the outer wall of the inner cylindrical member.

[0019] The valve stem 16 can have a cavity 22 extending through the central longitudinal axis of the valve stem 16. Alternatively, the cavity 22 can extend through another longitudinal axis of the valve stem 16 (e.g., the cavity 22 can be off-center). The space between the outer surface of the valve stem 16 and the surface defining the cavity 22 can be solid, and the cavity 22 can be a hole formed in the valve stem 16. In another example, the space between the outer surface of the valve stem 16 and the surface defining the cavity 22 can be hollow. In this case, the cavity 22 can be formed by a longitudinal tube within the valve stem 16.

[0020] The cavity 22 can be open to the exterior of the valve stem 16 at the proximal end of the cavity 22 via one or more proximal openings 24. For example, the cavity 22 can be fluidically connected to the proximal opening 24 via a second proximal cavity (not shown), which can span the cavity 22. For example, the second cavity can be perpendicular to the cavity 22 (extending to Figure 1A ). Cavity 22 may open to an exterior region of valve stem 16 at the distal end of cavity 22 via one or more distal openings 26. Cavity 22 may be fluidically connected to distal openings 26 via a third, distal cavity (not shown), which may span cavity 22. For example, the third, distal cavity may be perpendicular to cavity 22 (extending to Figure 1A (the surface in the middle).

[0021] The valve stem 16 may be provided with a first distal seal 32, a second distal seal 34, and a third distal seal 36. The distal seals 32, 34, 36 may be made of an elastomeric material. The distal seals 32, 34, 36 may be identical to one another and, for example, may be O-rings. The distal seals 32, 34, 36 may be disposed in circumferential, annular grooves, or indentations on the valve stem 16. The hardness and outer diameter of the distal seals 32, 34, 36 may provide an interference fit between the distal seals 32, 34, 36 and the inner surface 38 of the endoscopic valve barrel 39 when the valve 10 is inserted into the endoscopic valve barrel 39. This interference fit may be loose enough to allow the valve stem 16 to slide relative to the surface 38, but tight enough to prevent fluid from flowing longitudinally between the radially outermost surfaces of the seals 32, 34, 36 and the surface 38. The third distal seal 36 can be positioned proximate the distal end 14 of the valve 10 and distal to the distal opening 26. The second distal seal 34 can be proximal to the third distal seal 36 and proximal to the distal opening 26. The first distal seal 32 can be proximal to the second distal seal 34 but still distal to the proximal opening 24.

[0022] A proximal seal 42 may also be provided on the valve stem 16. The proximal seal 42 may have any of the characteristics of the distal seals 32, 34, and 36. For example, the proximal seal 42 may be a resilient O-ring and may be disposed in an annular circumferential groove or notch in the valve stem 16. The hardness and outer diameter of the proximal seal 42 may allow the proximal seal 42 to contact the surface 38 (see FIG. 1 ) when the valve 10 is inserted into the endoscope valve barrel 39. Figures 1A-1B ) have an interference fit. The interference fit can be loose enough to allow the valve stem 16 to slide relative to the endoscope valve barrel surface 39, but tight enough to prevent fluid from flowing longitudinally between the radially outermost surface of the proximal seal 42 and the surface 38. The proximal seal 42 can have a larger inner diameter than the distal seals 32, 34, 36 because the groove in the valve stem 16 at the location of the proximal seal 42 has a smaller diameter. The proximal seal 42 can have a larger outer diameter than the distal seals 32, 34, 36 because the space defined by the surface 38 at the location of the seal 42 is wider than the space defined by the surface 38 at the location of the seals 32, 34, 36. It will be appreciated that the seals 32, 34, 36, and 42 can be of any size to fit around the valve stem 16 and seal against the surface 38 to selectively prevent fluid flow.

[0023] The valve stem 16 may also be equipped with a one-way seal 62, which may be disposed longitudinally along the valve stem 16 between the first distal seal 32 and the proximal seal 42. The one-way seal 62 may be formed of an elastomeric material that may stretch to conform to the valve stem 16. The one-way seal 62 may be disposed in a groove or notch in the valve stem 16. The inner surface of the one-way seal 62 may be sized so that there is a slight interference fit between the outer surface of the valve stem 16 and the inner surface of the one-way seal 62, thereby forming a tight seal. The outer diameter of the one-way seal 62 may be sized so as to form a slight interference fit with the surface 38 (see FIG. Figures 1A-1B The fins of the one-way seal 62 can extend radially outward from the valve stem 16 at an angle transverse to the longitudinal axis of the valve stem 16. For example, the fins can extend at an angle between approximately 10 degrees and 80 degrees relative to the longitudinal axis of the valve stem 16. The fins of the one-way seal 62 can expand so that when the fluid (e.g., water or air) moves in the distal direction, positive pressure will cause the fins to expand, maintaining a seal between the one-way seal 62 and the surface 38 (see FIG. Figures 1A-1B The proximally moving fluid also creates a positive pressure, but the positive pressure creates a force orthogonal to the longitudinal axis of the valve stem 16 to radially compress the wings of the one-way seal 62 toward the valve stem 16. Thus, fluid (e.g., air or water) is permitted to move proximally through the one-way seal 62 between the one-way seal 62 and the surface 38.

[0024] The proximal opening 24 can be axially disposed between the one-way seal 62 and the proximal seal 42. The distal opening 26 can be axially disposed between the third distal seal 36 and the second distal seal 34.

[0025] The cap 18 can have a fixed portion 70 and a movable portion 72. Although the movable portion 72 is described herein as being separate from the valve stem 16, it is understood that the movable portion 72 and the valve stem 16 can be formed from a single, integral piece. When the valve 10 is inserted into the valve cartridge 39, the fixed portion 70 can remain fixed relative to the valve cartridge 39. The fixed portion 70 can include an inner cylindrical member 74 and an outer cylindrical member 76. Figures 1A-1B As shown, the inner cylindrical member 74 and the outer cylindrical member 76 can be made of a single, integral material, which can promote manufacturing efficiency. Alternatively, the inner cylindrical member 74 and the outer cylindrical member 76 can be two separate workpieces that are assembled together. The outer cylindrical member 76 can include one or more mating features 78 for mating the cover 18 with the outer portion of the valve cylinder 39. For example, the mating feature 78 can be a protrusion extending radially inward, and the protrusion can be mated with a corresponding groove or notch of the valve cylinder 39. The distal surface of the inner cylindrical member 74 can rest on the proximal outer surface of the valve cylinder 39. The cross-section of the inner cylindrical member 74 can be "L" shaped, forming a base for the spring (to be described below).

[0026] The movable portion 72 can move proximally and distally (axially) relative to the valve stem 16 and / or the fixed portion 70. The movable portion 72 can be attached to the valve stem 16 so that proximal or distal (axial) movement of the movable portion 72 also causes the same movement of the valve stem 16. As described above, the movable portion 72 can be integrally formed with the valve stem 16. The movable portion 72 of the cap 18 can have a button shape or any other suitable shape. The edge 80 of the movable portion 72 can extend in the longitudinal direction between the outer cylindrical member 76 and the inner cylindrical member 74.

[0027] The lid 18 can be equipped with a spring 82, which can be a biasing member. The spring 82 can be a coil spring, a leaf spring, or other type of resilient member, such as any member having shape memory properties. The spring 82 can be, for example, a compression spring. The spring 82 can be configured in the lid 18 such that when the spring 82 is in a relaxed state, the valve 10 has a first configuration relative to the fixed portion 70. When the movable portion 72 is moved distally, causing the valve 10 to have a second configuration, the spring 82 can be in a deformed, compressed state and can store potential energy due to the deformation (e.g., compression) of the spring 82. The spring 82 can have properties, including a stiffness, such that the spring 82 exerts a known return force on the movable portion 72 after it has moved distally from the first configuration to the second configuration.

[0028] A lid seal 90 may be disposed between the movable portion 72 and the fixed portion 70. The lid seal 90 may be, for example, an O-ring seal, a gasket, or other type of structure, and may be formed from an elastic material. Additionally, in addition to a seal that provides resistance or friction between the movable portion 72 and the fixed portion 70, other components may be used in place of the lid seal 90. For example, instead of the lid seal 90, portions of the movable portion 72 or the fixed portion 70 may be textured or may have a structure or substance disposed thereon that increases the resistance therebetween. Figure 1A and 1BAs shown, the cap seal 90 can be fixed to the movable portion 72 within an annular groove within the movable portion 72, and the cap seal 90 can be movable relative to the fixed portion 70. Alternatively, the cap seal 90 can be fixed to the fixed portion 70 and movable relative to the movable portion 72. The cap seal 90 can provide friction between the outer surface of the cap seal 90 and the inner surface of the fixed portion 70. Therefore, when the valve 10 is in the second configuration and the spring 82 is in a deformed, compressed state, the friction caused by the cap seal 90 can counteract the spring 82's rebound force, which urges the movable portion 72 and the valve stem 16 toward the first configuration, in which the spring 82 is relaxed. The relationship between the friction caused by the cap seal 90 and the rebound force caused by the spring 82 can be such that the valve 10 automatically moves from the second configuration to the first configuration within a set, predetermined time. In other words, the friction can delay the valve 10 from returning to the first configuration. This delay can correspond to the time required to flush the air channel of the endoscope, as described below.

[0029] A valve stem seal 91 may be disposed between the fixed portion 70 and the valve stem 16. The valve stem seal 91 may be, for example, an O-ring seal, a gasket, or other type of structure, and may be formed of an elastomeric material. Figure 1A and 1B As shown, the stem seal 91 can be fixed to the fixed portion 70 in an annular groove in the fixed portion 70, and the stem seal 91 can be movable relative to the valve stem 16. Alternatively, the stem seal 91 can be fixed to the valve stem 16 and movable relative to the fixed portion 70. The stem seal 91 can be configured to prevent fluid (e.g., air or water) from passing proximally or distally of the stem seal 91.

[0030] Figure 1A The valve 10 is shown in a first configuration, wherein air is flushed through the water and air channels of the endoscope. In the first configuration, the spring 82 may be in a relaxed state, and therefore the movable portion 72 may be in a raised position. In the first configuration, the third distal seal 36 may be positioned proximal to the water inlet A of the endoscope valve barrel 39, and may also be positioned distal to the water outlet B of the endoscope valve barrel 39. The second distal seal 34 may be proximal to the water outlet B, but distal to the air inlet C. The first distal seal 32 may also be distal to the air inlet C. The one-way seal 62 may be proximal to the air inlet C, and distal to the air outlet D.

[0031] Thus, in the first configuration, water or other fluid from water inlet A may not move proximally through the third distal seal 36 and, therefore, may not move to water outlet B. Due to the first distal seal 32, air or other fluid from air inlet C may not move distally along the outer surface of the valve stem 16. However, air from air inlet C may move proximally through the one-way seal 62. Consequently, air may enter air outlet D and also enter the proximal opening 24. Air entering the proximal opening 24 may pass distally through the lumen 22 and exit through the distal opening 26. Because the distal opening 26 is located between the third distal seal 36 and the second distal seal 34, air exiting the distal opening 26 may not move proximally or distally along the outer surface of the valve stem 16. However, air exiting the distal opening 26 may exit through the water outlet B. The first configuration may be used after flushing the air channel of an endoscope to ensure that the air and water channels are cleared of water before further reprocessing of the scope.

[0032] Figure 1B A second, compressed configuration of the valve 10 is shown, in which water is flushed down the air passage. The spring 82 can be compressed in the second configuration, thereby causing the movable portion 72 to translate distally relative to the first configuration. The entire valve stem 16 is displaced distally by the same amount as the movable portion 72. The proximal seal 42 can remain proximal to the air outlet D. The one-way seal 62 can be displaced distally relative to the first configuration, so that air or other fluid from the air inlet C may not move through the one-way seal 62 (e.g., fluid flow is blocked) because the distal portion of the one-way seal 62 engages the narrow, tapered region of the endoscope valve barrel 39, so that air cannot flow proximally past the distal portion of the one-way seal 62 to reach the proximal movable wing of the one-way seal 62.

[0033] In the second configuration, the third distal seal 36 can be distal to the water inlet A, while the second distal seal 34 can remain proximal to the water inlet A. Thus, water or other fluid from the water inlet A can enter proximal to the third distal seal 36 but may not move proximally along the outer surface of the valve stem 16 past the second distal seal 34. However, the water or other fluid can enter the distal opening 26 and travel through the lumen 22 and the proximal opening 24. After the water or other fluid exits the proximal opening 24, it may not flow distally through the one-way seal 62 or proximally through the one-way seal 62. However, the water or other fluid can flow out of the air outlet D to flush the air channel of the endoscope.

[0034] If the operator is moving the valve 10 from the first configuration ( Figure 1A ) transitions to the second configuration ( Figure 1B), and then releasing the movable portion 72 of the cover 18, the valve 10 will slowly move back to the first configuration due to the restoring force exerted by the spring 82. However, the valve 10 may not immediately return to the first configuration due to the friction caused by the valve cover seal 90. For example, the cover seal 90 can exert a force opposite to the force exerted by the spring 82, thereby delaying the relaxation of the spring 82 and the return to the first structure of the valve 10. The valve 10 can continue to deliver water or other fluid to the air outlet D until the third distal seal 36 approaches the water inlet A. Thus, the valve 10 can deliver water or other fluid to the air outlet D for a predetermined time, which time can be dictated by the cleaning regimen, without the user having to press the portion 72 of the cover 18. For example, the cover seal 90 and the spring 82 can be calibrated to flush the air passage within a specific, predetermined time.

[0035] After the surgery using the endoscope is completed, the operator can remove the air valve / water valve used in the surgery from the valve cartridge 39. The operator can then insert the valve 10 into the valve cartridge 39. The distal portion 76 of the cap 18 can be fixed to the valve cartridge 39 using the mating features 78.

[0036] The valve 10 can be inserted into the valve cylinder 39 in the first configuration of the valve 10. The operator can depress the movable portion 72, which compresses the spring 82 and displaces the valve stem 16 downward relative to the valve cylinder 39 and the fixed portion 70. The user can then release the movable portion 72 and can attend to other aspects of the postoperative procedure. Even without operator intervention, the valve 10 can be maintained in the second compressed configuration for a predetermined time (e.g., 30 seconds) to flush water through the air channel of the endoscope, thereby clearing debris from the air channel. As described above, the interaction between the spring 82 and the cover seal 90 can facilitate automatic flushing within a predetermined time. As described above, due to the force applied by the spring 82, the movable portion 72 (and the valve stem 16) may eventually return to the first configuration. After the flushing of water through the air channel is completed, the valve 10 can be set.

[0037] Steering Figure 2A and 2B The second exemplary valve 100 may include a valve stem 116 and a cap 118 (which may be the operative portion of the valve 100). The valve 100 may be mounted in a valve cartridge 139, which may have any of the characteristics of the valve cartridge 39. The valve 100 may have any of the characteristics of the valve 10.

[0038] Valve stem 116 can be formed from any suitable material, including any of the materials described above with respect to valve stem 16, and can have any of the characteristics of valve stem 16. Valve stem 116 can include a cavity 122, which can have any of the characteristics of cavity 22. Cavity 122 can be formed substantially along the central longitudinal axis of valve stem 116 or along another eccentric longitudinal axis of valve stem 116. Alternatively, at least a portion of cavity 122 can span the longitudinal axis of valve stem 116. Cavity 122 can have a proximal bend 124 and a distal bend 126. A midsection 128 of cavity 122 can be located between proximal bend 124 and distal bend 126. Cavity 122 can bend at proximal bend 124 / distal bend 126 by up to 90 degrees, approximately 90 degrees, or any other suitable amount. The proximal end of cavity 122 can terminate at a proximal opening or aperture 130. Proximal opening 130 may extend through the wall of valve stem 116 and fluidly connect lumen 122 to an area outside valve stem 116. The distal end of lumen 122 may terminate at distal opening or aperture 132. Distal opening 132 may extend through the wall of valve stem 116 and fluidly connect lumen 122 to an area outside valve stem 116. Proximal opening 130 and distal opening 132 may be radially aligned on valve stem 116. Proximal bend 124 / distal bend 126 may be omitted. If proximal bend 124 is omitted, proximal opening 130 may be in direct communication with midsection 128 of lumen 122. Similarly, if distal bend 126 is omitted, distal opening 132 may be in direct communication with midsection 128 of lumen 122. Valve stem 116 may be equipped with a proximal rotary seal 140, a distal rotary seal 142, and an intermediate rotary seal 150.

[0039] Figure 3A An exemplary seal 200 is shown, the basic structure of which may be used for distal rotary seal 142. Seal 200 or features of seal 200 may also be used for proximal rotary seal 140 and / or intermediate rotary seal 150. Seal 200 may be made of any suitable material and may be resilient. Figure 3AAs shown, seal 200 can be annular and can have the general shape of a gasket or O-ring. Seal 200 can have an inner opening 202 defined by an inner surface 203. Surface 203 can mate with the circumference of valve stem 116, such that inner surface 203 contacts the outer surface of valve stem 116. When valve 100 is inserted into valve cartridge 139, outer surface 204 of seal 200 can contact inner surface 138 of valve cartridge 139. Surfaces 203 and 204 can be flat; in other words, the wall defining opening 202 can have a substantially uniform thickness, except in the areas of through-hole 210 and recess 212, which will be described. Through-hole 210 can be formed through the wall of seal 200, extending from the surface defined by recess 212 to inner surface 203. Outer surface 204 of seal 200 can define a recessed recess 212, which can surround through-hole 210. The recess 212 can have a substantially rectangular cross-section and can extend at least partially around the circumference of the outer surface 204, extending through the through-hole 210. The recess 212 can extend circumferentially through the through-hole 210 in both directions (as shown) or in only one direction or the other (e.g., the recess 212 can terminate adjacent to the through-hole 210). The width of the recess 212 (in the axial direction) can be similar to the diameter of the through-hole 210, or the width of the recess 212 (in the axial direction) can be less than the diameter of the through-hole 210. The recess 212 can have a thickness (in the radial direction) such that it partially passes through the wall defining the opening 202, but does not completely pass through the wall defining the opening 202. The function of the recess 212 will be discussed in further detail below.

[0040] Figure 3B An exemplary seal 300 is shown, the basic structure of which may be used for the intermediate rotary seal 150. The seal 300 may have any of the features of the seal 200 discussed above. The seal 300 or features of the seal 300 may also be used for the proximal rotary seal 140 and / or the distal rotary seal 142. The seal 300 may be made of any suitable material and may be resilient. Figure 3BAs shown, seal 300 can be annular and can have a general gasket or O-ring shape. Seal 300 can have an inner opening 302 defined by an inner surface 303. Surface 303 can mate with the circumference of valve stem 116, such that inner surface 303 contacts the outer surface of valve stem 116. When valve 100 is inserted into valve cartridge 139, outer surface 304 of seal 300 can contact inner surface 138 of valve cartridge 139. Surfaces 303 and 304 can be flat; in other words, the walls defining opening 302 can have a substantially uniform thickness, except in the area of ​​recess 320, which will be described. Outer surface 304 of seal 300 can define a recessed recess 320 extending along the longitudinal length of seal 300. Recess 320 can have a substantially rectangular cross-section. The function of recess 320 will be discussed in further detail below. Alternatively, the seal 300 may not have a complete annular shape, but instead extend only partially around the circumference of the valve stem 116. In such a configuration, the recess 320 may be omitted from the seal 300.

[0041] Figure 3C and 3DAnother exemplary seal 400 is shown, the basic structure of which may be used for the proximal rotary seal 140. Seal 400 may have any of the features discussed above for seals 200 and 300. Seal 400, or features of seal 400, may also be used for the distal rotary seal 142 and / or the intermediate rotary seal 150. Seal 400 may be made of any suitable material and may be elastic. Seal 400 may be annular, generally in the shape of a gasket or O-ring. Seal 400 may have an inner opening 402 defined by an inner surface 403. Surface 403 may mate with the circumference of valve stem 116, such that inner surface 403 contacts the outer surface of valve stem 116. When valve 100 is inserted into valve cylinder 139, outer surface 404 of seal 200 may contact inner surface 138 of valve cylinder 139. Surfaces 403 and 404 may have any of the features discussed above for surfaces 303 and 304. A through-hole 410 may be formed through the wall of seal 400, extending from the surface defined by recess 412 to inner surface 403. The outer surface 404 of seal 400 may define a recessed recess 412 that may surround through-hole 410. As described above, through-hole 410 and recess 412 may have any of the characteristics of through-hole 210 and recess 212, respectively. The outer surface 404 of seal 400 may define a recessed recess 420 that extends along the longitudinal length of seal 400. Recess 420 may have any of the characteristics of recess 320, described above. Recess 420 may be positioned completely opposite through-hole 410 or at another angle relative to hole 410. Alternatively, seal 400 may not have a fully annular shape and may extend only partially around the circumference of valve stem 116. In such a configuration, recess 420 may be omitted from seal 400.

[0042] As described above, the proximal rotary seal 140, the distal rotary seal 142, and the intermediate rotary seal 150 can have the features of the seals 200, 300, and 400 discussed above. The proximal rotary seal 140, the distal rotary seal 142, and the intermediate rotary seal 150 can have different inner and / or outer diameters to accommodate valve stems 116 and / or valve cylinders 139 of different diameters at various locations of the proximal rotary seal 140 and the distal rotary seal 142.

[0043] Proximal rotary seal 140 (which may have any of the structures described above with respect to seal 400) may be positioned such that through-hole 146 of proximal rotary seal 140 (which may have any of the characteristics of through-hole 410) is aligned with proximal opening 130. Recess 147 of proximal rotary seal 140 (which may have any of the characteristics of recess 420) may be positioned 180 degrees (diametrically opposite) from proximal opening 130 or at a different angle relative to proximal opening 130 (as described below).

[0044] Distal rotary seal 142 (which may also have any of the structures described above with respect to seal 200) may be positioned so that through-hole 148 (which may have any of the characteristics of through-hole 210) of distal rotary seal 142 is aligned with distal opening 132. Thus, cavity 122 may be in fluid communication with the outer surfaces of proximal rotary seal 140 and distal rotary seal 142 via through-hole 146 and through-hole 148, respectively.

[0045] Intermediate rotary seal 150 (which may also have any of the features described above with respect to seal 300) may be positioned so that recess 151 (which may have any of the characteristics of recess 320) coincides with recess 147 of proximal rotary seal 140. Intermediate rotary seal may be positioned 180 degrees (diametrically opposed) from proximal and distal openings 130, 132, or at another angle relative to proximal and distal openings 130, 132 (as described below).

[0046] The proximal rotary seal 140, the distal rotary seal 142, and the intermediate rotary seal 150 can be configured to each have a slidable interference fit with the inner surface 138 of the valve cylinder 139 when the seals 140, 142, 150 are positioned about the valve stem 116. Fluids, such as air and / or water, may not move proximally or distally between the outer surface of the valve stem 116 and the inner surface 138 of the valve cylinder 139 through the distal rotary seal 142. Fluids, such as air and / or water, may not move proximally or distally between the outer surface of the valve stem 116 and the inner surface 138 of the valve cylinder 139 through the proximal rotary seal 140 or the intermediate rotary seal 150, except at the recesses 147, 151.

[0047] The cap 118, which may have any of the characteristics of the cap 18, may include a fixed portion 170 and a rotatable portion 172. Although the rotatable portion 172 is described herein as being separate from the valve stem 116, it is understood that the rotatable portion 172 may be integrally formed with the valve stem 116. When the valve 100 is inserted into the valve cylinder 139, the fixed portion 170 may remain fixed relative to the valve cylinder 139. The fixed portion 170 may include an inner cylindrical member 174 and an outer cylindrical member 176. Figures 2A-2BAs shown, the inner cylindrical member 274 and the outer cylindrical member 276 can be made of a single integral material, which may be beneficial for improving manufacturing efficiency. Alternatively, the inner cylindrical member 274 and the outer cylindrical member 276 can be two separate workpieces that are assembled together. The outer cylindrical member 176 can include one or more mating features 178 for mating the cover 118 with the outer portion of the valve cylinder 139. For example, the mating features 178 can be radially inwardly extending protrusions that can mate with corresponding grooves or notches in the valve cylinder 139. The distal surface of the inner cylindrical member 174 can rest on the proximal outer surface of the valve cylinder 139. The cross-section of the inner cylindrical member 174 can be "L"-shaped, forming a radially outward flange, or a base for a spring (to be described).

[0048] The rotatable portion 172 is rotatable relative to the valve cylinder 139 and / or the fixed portion 170. Although the rotatable portion 172 is depicted separately from the valve stem 116, it will be appreciated that the rotatable portion 172 and the valve stem 116 may be formed from a single, integral structure. The rotatable portion 172 may be attached to the valve stem 116 such that rotation of the rotatable portion 172 also causes rotation of the valve stem 116. The rotatable portion 172 of the cap 118 may have a button shape, a knob shape, or any other suitable shape. The outer surface of the rotatable portion 172 may include a gripping surface to assist the user in gripping the rotatable portion 172. The edge 180 of the rotatable portion 172 may extend longitudinally between the outer cylindrical member 176 and the inner cylindrical member 174. The rotatable portion 172 may also be movable proximally and distally. The rotatable portion 172 may rotate when it is translated proximally or distally. For example, a user may depress the rotatable portion 172, which may engage a ramp or other surface, causing the rotatable portion 172 to rotate as it translates proximally or distally.

[0049] The lid 118 may be equipped with a spring 182, which may be a biasing member. The spring 182 may be a coil spring, a leaf spring, or another type of resilient member, such as any member having shape memory properties. For example, the spring 182 may be a torsion spring. Alternatively, the spring 182 may be a compression spring. The spring 182 may be configured in the lid 118 so that when the spring 182 is in a relaxed state, the valve 100 has a first configuration. When the rotatable portion 172 is rotated about the longitudinal axis of the valve (e.g., in a clockwise or counterclockwise direction) to cause the valve 100 to have a second configuration, the spring 182 may be in a deformed state and may store potential energy due to the deformation of the spring 182. The spring 182 may have properties, including stiffness, such that the spring 182 exerts a known rebound force on the rotatable portion 172 after it rotates from the first configuration to the second configuration.

[0050] A lid seal 190 may be provided between the rotatable portion 172 and the fixed portion 170. The lid seal 190 may have any of the characteristics of the lid seal 90. Alternatively, other components may be used in place of the lid seal 190 in addition to a seal that provides resistance or friction between the movable portion 172 and the fixed portion 170. For example, instead of the lid seal 190, portions of the movable portion 172 or the fixed portion 170 may be textured or may have a structure or substance disposed thereon that increases the resistance therebetween. The lid seal 190 may be, for example, an O-ring, a gasket, or other shape, and may be formed from a resilient material. As Figure 2A and 2B As shown, cap seal 190 can be fixed relative to rotatable portion 172 in an annular groove within rotatable portion 172, and cap seal 190 can rotate relative to fixed portion 170. Alternatively, cap seal 190 can be fixed relative to fixed portion 170 and rotatable relative to rotatable portion 172. Cap seal 190 can provide friction between the outer surface of cap seal 190 and the inner surface of fixed portion 170. Therefore, when valve 100 is in the second configuration and spring 182 is deformed, the friction caused by cap seal 190 can counteract the rebound force of spring 182, which urges valve 100 into the first configuration, in which spring 182 is relaxed. The relationship between the friction caused by cap seal 190 and the rebound force caused by spring 182 can be such that valve 100 automatically moves from the second configuration to the first configuration within a set, predetermined time. In other words, the friction can delay the valve 100 from returning to the first configuration. This delay can correspond to the time required to flush the air channels of the endoscope, as described below.

[0051] A valve stem seal 191 can be disposed between the valve stem 116 and the inner surface 138 of the valve cylinder 139. The valve stem seal 191 can be, for example, an O-ring, a gasket, or other type of structure, and can be formed from an elastomeric material. The valve stem seal 191 can be fixed to the valve stem 116. The valve stem seal 191 can be configured to prevent fluid (e.g., air or water) from passing proximally or distally from the valve stem seal 191.

[0052] Figure 2A The valve 100 is shown positioned in the valve cylinder 139 and in the first configuration described above. The spring 182 is in a relaxed, neutral state such that the spring 182 exerts no force to rotate the rotatable portion 172 and the valve stem 116.

[0053] The proximal rotary seal 140 can be positioned so that the through-hole 146 is axially aligned with the air outlet D, but is angularly offset from the air outlet D (relative to the longitudinal axis). For example, the through-hole 146 can be offset from the air outlet D by 180 degrees or another angle (e.g., 90 degrees or 45 degrees). Similarly, the distal rotary seal 142 can be positioned so that the through-hole 148 is axially aligned with the water inlet A, but is angularly offset from the water inlet A (relative to the longitudinal axis). For example, the through-hole 148 can be offset from the water inlet A by 180 degrees or another angle (e.g., 90 degrees or 45 degrees). The through-hole 146 and the through-hole 148 can be offset by the same angle (e.g., 180 degrees) from the air outlet D and the water inlet A, respectively.

[0054] The proximal rotary seal 140 may further be positioned such that the notch 147 is axially and radially aligned with the air outlet D. The intermediate rotary seal 150 may also be positioned such that the notch 151 is axially and radially aligned with the air inlet C.

[0055] In the first configuration, water or other fluid from water inlet A may not be able to pass proximally through distal rotary seal 142. Consequently, water or other fluid may not exit water outlet B or air outlet D. Air or other fluid from water inlet C can pass proximally and distally through intermediate rotary seal 150 because groove 151 is aligned with air inlet C. Thus, in the first configuration, air or other fluid passes from air inlet C through water outlet B and air outlet D. The first configuration can be used after flushing the air channel of an endoscope to ensure that the air and water channels are cleared of water before further reprocessing of the scope.

[0056] Figure 2B The valve 100 is shown in the second configuration discussed above. To convert the valve 100 from the first configuration to the second configuration, the user can rotate the rotatable portion 172 of the cap 118. For example, Figures 2A-2B As shown, the rotatable portion 172 can be rotated 180 degrees to transition the valve 100 from the first configuration to the second configuration. Alternatively, the rotatable portion 172 can be rotated another amount, which may correspond to the offset of the through-holes 146, 148 in the first configuration. In the second configuration, the through-hole 146 of the proximal rotary seal 140 can be axially and radially (angularly) aligned with the air outlet D, while the recess 147 can be misaligned with the air outlet D. Similarly, the through-hole 148 of the distal rotary seal 142 can be axially and radially aligned with the water inlet A. The intermediate rotary seal 150 can be rotated so that the recess 151 is no longer aligned with the air inlet C.

[0057] In the second configuration, water or other fluid from water inlet A can pass through through-hole 148 and through distal opening 132 and into lumen 122. Water or other fluid can travel proximally through lumen 122, through proximal opening 130, through through-hole 146, and into air outlet D. Water or other fluid from water inlet A may not pass proximally through distal rotary seal 142. Water or other fluid exiting through through-hole 146 cannot pass distally through proximal rotary seal 140. Air or other fluid from air inlet C may not pass distally through intermediate rotary seal 150 because notch 151 is not aligned with air inlet C. Therefore, in the second configuration, only water or other fluid can exit through air outlet D to flush the air channel of the endoscope and clear debris from the air channel after surgery.

[0058] In the second configuration, if the user does not operate the lid 118 of the valve 100, the valve 100 may remain in the second configuration for a period of time due to the interaction between the spring 182 and the lid seal 190. Over a period of time (e.g., a predetermined period of time), the restoring force of the spring 182 may return the valve 100 to the first configuration. For example, the lid seal 190 may exert a force opposite to the force exerted by the spring 182, thereby delaying the relaxation of the spring 182 and the return to the first configuration of the valve 100. The valve 100 may gradually return to the first configuration (e.g., it may slowly move from the second configuration to the first configuration). Because the proximal and distal rotary seals 140, 142 may include recessed notches (such as notch 212) adjacent to the through-hole 146 and through-hole 148, respectively, water or other fluid may continue to flow through the through-hole 146 and through-hole 148 even after the through-hole 146 is no longer directly aligned with the air outlet D and the through-hole 148 is no longer directly aligned with the water inlet A. For example, the recess can extend around a portion of the circumference of proximal rotary seal 140 and / or distal rotary seal 142, such that as rotary seal 140 or rotary seal 142 rotates with valve stem 116, the recess can continue to be adjacent to air outlet D or water inlet A. Water or other fluid can flow from water inlet A into the recess of distal rotary seal 142, into through-hole 146, through distal opening 132, through cavity 122, through proximal opening 130, out through-hole 148, through the recess of proximal rotary seal 140, and into water outlet D. When the recess of proximal rotary seal 140 and / or distal rotary seal 142 is no longer in communication with air outlet D and / or water inlet A, respectively, the flow of water or other fluid can cease. Thus, valve 100 can deliver water to air outlet D for a predetermined period of time, which can be dictated by a cleaning schedule. For example, cap seal 190 and spring 182 can be calibrated to flush the air passageway within a specific, predetermined period of time.

[0059] An exemplary method for using valve 100 is provided herein. After an endoscope-based procedure, the endoscope can be removed from the patient. To prepare the endoscope for reprocessing, the air / water valve can be removed from valve cartridge 139. Then, while valve 100 is in a first configuration, it can be inserted into valve cartridge 139. In the first configuration, as described above, neither air nor water can be flushed through any of the endoscope's channels. The user can rotate rotatable portion 172 of cap 118 to transition valve 100 to a second configuration. The user can then release rotatable portion 172 of cap 118 and attend to other aspects of the postoperative procedure. Even after rotatable portion 172 is released, water or other fluid can continue to flow through the endoscope's air channel from water inlet A and air outlet D for a predetermined period of time. After valve 100 has flushed water or other fluid through the air channel for the predetermined period of time, valve 100 can be removed from valve cartridge 139 and optionally disposed of.

[0060] Although the principles of the present invention have been described herein with reference to illustrative examples for specific applications, it should be understood that the present invention is not limited thereto. Personnel with ordinary skill in the art and access to the teachings provided herein will recognize that additional modifications, applications, and substitutions of equivalents fall within the scope of the examples described herein. Therefore, the present invention should not be considered to be limited by the foregoing description.

Claims

1. A medical valve inserted into a valve barrel of an endoscope, wherein the valve barrel includes a water inlet, a water outlet, an air inlet, and an air outlet; the medical valve comprises: a valve stem; wherein the radially outer surface of the valve stem includes a first opening and a second opening, wherein the valve stem includes a cavity extending along the longitudinal axis of the valve, and the cavity is in fluid communication with the first opening and the second opening; as well as An operating part, comprising: Fixed part; a movable portion movable relative to the fixed portion and fixed relative to the valve stem; the movable portion movable along a first direction from a first configuration to a second configuration; a seal disposed between the fixed portion and the movable portion; and offset member; wherein movement of the movable portion in the first direction causes the biasing member to deform such that a restoring force of the biasing member urges the movable portion to move in a second direction opposite the first direction, and wherein friction between the seal and one of the fixed portion and the movable portion resists movement of the movable portion in the second direction; wherein the friction delays return of the medical valve to the first configuration, the delay being consistent with a time required to flush an air channel of an endoscope; When the movable part is in the first structure, the seal and the valve cylinder are positioned so that the fluid enters through the air inlet, passes through the first opening, the cavity, the second opening in sequence, and leaves through the water outlet; when the movable part is in the second structure, the seal and the valve cylinder are positioned so that the fluid enters through the water inlet, passes through the second opening, the cavity, the first opening in sequence, and leaves through the air outlet.

2. The medical valve of claim 1, wherein the biasing member is a spring.

3. The medical valve of any one of the preceding claims, wherein the relationship between the friction force and the restoring force is such that, after the movable portion transitions from the first configuration to the second configuration, the movable portion will automatically move in the second direction to return to the first configuration.

4. The medical valve of claim 1 , wherein a proximal seal, a one-way seal, and three distal seals are disposed on an outer surface of the valve stem, wherein the first opening is between the proximal seal and the one-way seal, and wherein the second opening is between a first distal seal of the three distal seals and a second distal seal of the three distal seals.

5. The medical valve of claim 1, wherein the valve stem is movable in a proximal direction and a distal direction relative to a valve barrel receiving the valve stem.

6. The medical valve of claim 1, wherein the movable portion includes a rim extending between the inner cylindrical portion and the outer cylindrical portion of the fixed portion.

7. The medical valve of claim 1, wherein the securing portion includes mating features for mating with a valve barrel of an endoscope.

8. The medical valve of claim 1, wherein the valve stem is a unitary, unitary structure formed from a single material.

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