Suction valve for endoscope

Abstract

Devices, systems, and methods for aspiration valve assemblies for medical devices. The suction valve assembly may include a valve well and a valve stem. The stem may include a first seal, a second seal, and a third seal. The valve stem may include a first opening and a second opening fluidly coupled to each other via a cavity. The valve well may include a proximal opening, a distal opening, and an intermediate opening. The valve stem may be configured to translate within the valve well to adjust between a first configuration in which the third seal is a barrier between the intermediate opening and the distal opening, and the cavity is fluidly isolated from the intermediate opening, and a second configuration in which the third seal is fluidly isolated from the distal opening. The first seal is a barrier between the proximal opening and the intermediate opening, and the cavity is isolated from the proximal opening.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of U.S. Provisional Patent Application Serial No. 63 / 396,437, filed on August 9, 2022, entitled Aspiration Valve for an Endoscope, which is incorporated herein by reference. Technical Field

[0002] The present invention relates generally to valve assemblies and methods, and in particular to aspiration valve assemblies and methods for endoscopes. Background Art

[0003] A wide variety of in vivo medical devices and systems have been developed for medical use, such as endoscopic surgery. Some of these devices and systems include guide wires, catheters, catheter systems, endoscopic instruments, and the like. These devices and systems are manufactured by any of a variety of different manufacturing methods and can be used according to any of a variety of methods. Each of the known medical devices, systems, and methods has certain advantages and disadvantages. There is a need to provide alternative medical devices and systems and alternative methods for making and using medical devices and systems. Summary of the invention

[0004] The present invention provides designs, materials, manufacturing methods, and use alternatives for medical devices and medical systems. In a first example, a suction valve assembly for a medical device may include a valve well having a proximal opening, a distal opening, and an intermediate opening positioned between the proximal opening and the distal opening; a valve stem configured to translate within the valve well, the valve stem including a first opening, a second opening, a cavity extending from the first opening to the second opening, a first seal extending circumferentially around the valve stem at a position proximal to the first opening, a second seal extending circumferentially around the valve stem at a position distal to the first opening, and a third seal extending circumferentially around the valve stem at a position distal to the second seal. The valve stem may have a first configuration in the valve well, wherein the second seal is a barrier between the proximal opening and the intermediate opening, the third seal is a barrier between the intermediate opening and the distal opening, and the cavity is fluidly isolated from the intermediate opening; and the valve stem may have a second configuration in the valve well, wherein the first seal is proximal to the intermediate opening and the cavity is fluidly isolated from the proximal opening, and the first seal is a barrier between the proximal opening and the intermediate opening.

[0005] Alternatively or additionally to any of the above examples, when the valve stem is in the first configuration, the proximal opening and the distal opening are in fluid communication through a lumen of the valve stem.

[0006] Alternatively or additionally to any of the above examples, when the valve stem is in the second configuration, the intermediate opening and the distal opening are in fluid communication through a lumen of the valve stem.

[0007] Alternatively or additionally to any of the above examples, when the valve stem is in the first configuration, the third seal is distal to the intermediate opening, and the distal opening is fluidly isolated from the intermediate opening.

[0008] Alternatively or additionally to any of the above examples, the second seal and the third seal are configured to contact an inner wall of the valve well when the valve stem is in the first configuration.

[0009] Alternatively or additionally to any of the above examples, the first opening is a radial opening in the valve stem and the second opening is an axial opening in the valve stem.

[0010] Alternatively or additionally to any of the above examples, the valve well may further include a body defining a middle opening and a distal opening, and a collar coupleable to the body, the collar defining a proximal opening.

[0011] Alternatively or additionally to any of the above examples, the first seal is configured to engage the collar when the valve stem is in the first configuration.

[0012] Alternatively or additionally to any of the above examples, the suction valve assembly may further include a cover coupled to the valve stem, a biasing mechanism extending between the cover and the valve well, and wherein the biasing mechanism is configured to bias the valve stem to the first configuration.

[0013] Alternatively or additionally to any of the above examples, the lid, biasing mechanism, valve stem and valve well are configured such that actuation of the lid in a direction opposite to the direction of the biasing force of the biasing mechanism is configured to adjust the valve stem from a first form to a second form.

[0014] Alternatively or additionally to any of the above examples, the valve stem may include: a first circumferential recessed portion where the first seal is located, a second circumferential recessed portion where the second seal is located, and a longitudinal recessed portion extending between the first circumferential recessed portion and the second circumferential recessed portion.

[0015] Alternatively or additionally to any of the above examples, the valve stem may include: a first circumferential recessed portion in which the first seal is located, a second circumferential recessed portion in which the second seal is located, a third circumferential recessed portion in which the second seal is located, a first longitudinal recessed portion extending between the first circumferential recessed portion and the second circumferential recessed portion, and a second longitudinal recessed portion extending between the second circumferential recessed portion and the third circumferential recessed portion.

[0016] Alternatively or additionally to any of the above examples, material forming one or more of the first seal, the second seal, and the third seal extends within one or both of the first longitudinal recess and the second longitudinal recess.

[0017] Alternatively or additionally to any of the above examples, the material forming the first seal, the second seal and the third seal (a) extends along the first longitudinal recess and links the first seal to the second seal, and (b) extends along the second longitudinal recess and links the second seal to the third seal.

[0018] In another example, a method of forming a valve stem for a suction valve for an endoscope includes forming a valve stem body from a first material, the valve stem body including: a first circumferential recess, a second circumferential recess, and a third circumferential recess; forming a first seal in the first circumferential recess, forming a second seal in the second circumferential recess, and forming a third seal in the third circumferential recess; and wherein the first seal, the second seal, and the third seal are formed from a second material, and the second material is a material different from the first material.

[0019] Alternatively or additionally to any of the above examples, the valve stem body also includes: a first opening, a second opening, and a cavity extending between the first opening and the second opening, wherein the first circumferential recess is located proximal to the first opening, and wherein the second circumferential recess and the third circumferential recess are located distal to the first opening.

[0020] Alternatively or additionally to any of the above examples, the valve stem body further comprises: a first longitudinal recess between the first circumferential recess and the second circumferential recess, and a second longitudinal recess between the second circumferential recess and the third circumferential recess.

[0021] In another example, a suction valve assembly for use in an endoscope having a cavity configured to extend into a patient's body cavity may include a valve well defining a port, the port being configured to be in communication with the cavity fluid; and a valve stem configured to be adjusted within the valve well, the valve stem including a first circumferential seal, a second circumferential seal, a third circumferential seal, a first connecting member extending between the first circumferential seal and the second circumferential seal, and a second connecting member extending between the second circumferential seal and the third circumferential seal, wherein the valve stem may be configured to isolate the port from negative pressure fluid when in a first form within the valve well, and wherein the valve stem may be configured to fluidically connect the port to negative pressure and isolate the port from atmospheric fluid when in a second form within the valve well.

[0022] Alternatively or additionally to any of the above examples, the valve stem may also include a first opening, a second opening, and a cavity extending between the first opening and the second opening, wherein the first circumferential seal may be located proximal to the first opening, and wherein the second circumferential seal and the third circumferential seal may be located distal to the first opening.

[0023] Alternatively or additionally to any of the above examples, the valve stem may also include a first circumferential recess where the first circumferential seal is located, a second circumferential recess where the second circumferential seal is located, a third circumferential recess where the third circumferential seal is located, a first longitudinal recess where the first connecting part is located, and a second longitudinal recess where the second connecting part is located, and wherein the first seal, the second seal, the third seal, the first connecting part and the second connecting part can be a single piece of material.

[0024] In yet another example, a medical device includes: a proximal endoscope handle, a distal tip unit suitable for insertion into a patient's body cavity, a slender tube extending between the proximal endoscope handle and the distal tip unit, and a suction valve connected to the cavity of the slender tube to adjustably fluidly connect the cavity to negative pressure, the suction valve including: a valve well and a valve stem configured to be adjusted in the valve well, the valve stem including a first circumferential seal, a second circumferential seal, and a third circumferential seal, and wherein the valve stem is configured to isolate the cavity from negative pressure fluid when in a first form in the valve well, and wherein the valve stem is configured to fluidly connect the cavity to negative pressure and isolate the cavity from atmospheric fluid when in a second form in the valve well.

[0025] Alternatively or additionally to any of the above examples, the valve stem may include: a radial opening, an axial opening, a valve stem cavity having a fluid-connected radial opening and an axial opening, and wherein a first circumferential seal is located proximal to the radial opening, and a second circumferential seal and a third circumferential seal are located between the radial opening and the axial opening.

[0026] Alternatively or additionally to any of the above examples, the valve stem may include: a radial opening, an axial opening, a valve stem cavity having a fluid-connected radial opening and an axial opening, and wherein when the valve stem is in a first form, the radial opening is connected to the atmosphere and a negative pressure fluid, and wherein when the valve stem is in a second form, the radial opening is connected to the negative pressure fluid and is isolated from the atmospheric fluid.

[0027] These and other features and advantages of the present invention will become apparent from the following detailed description, the scope of the claimed invention being set forth in the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate various embodiments and, together with the description, serve to explain the principles of the invention.

[0029] Figure 1 A schematic diagram depicting components of an illustrative endoscope;

[0030] Figure 2 A schematic diagram depicting components of an illustrative endoscope system;

[0031] Figure 3 depicts a schematic perspective view of an illustrative suction valve;

[0032] Figure 4 depicts a schematic cross-sectional view of an illustrative suction valve, wherein the suction valve is in a first configuration;

[0033] Figure 5 Depicted Figure 4 a schematic cross-sectional view of an illustrative suction valve in which the suction valve is in a second configuration;

[0034] Figure 6 depicts a schematic perspective view of an illustrative suction valve;

[0035] Figure 7 depicts a schematic perspective view of an illustrative valve stem;

[0036] Figure 8 a schematic diagram depicting a portion of a valve stem; and

[0037] Fig. 9 A schematic flow chart of an illustrative method of manufacturing a suction valve is depicted.

[0038] Although the present invention is suitable for various modifications and alternative forms, its specific details have been shown in the drawings by way of example and will be described in more detail. However, it should be understood that it is not intended to limit the present invention to the specific embodiments described. On the contrary, it is intended to cover all modifications, equivalents and substitutes that fall within the spirit and scope of the present invention. DETAILED DESCRIPTION

[0039] The present invention will now be described with reference to an illustrative medical system that can be used in an endoscopic medical procedure. However, it should be noted that reference to this particular procedure is provided for convenience only and is not intended to limit the present invention. One of ordinary skill in the art will recognize that the concepts underlying the disclosed apparatus and associated methods of use can be used in any suitable surgical, medical or other context. The present invention may be understood with reference to the following description and accompanying drawings, in which like elements are designated by like reference numerals.

[0040] All numerical values ​​are assumed to be modified by the term "about" herein, whether or not explicitly indicated. In the context of numerical values, the term "about" generally refers to a numerical range that is considered by those skilled in the art to be equivalent to the quoted value (e.g., having the same function or result). In many cases, the term "about" may include numbers rounded to the nearest significant figure. Unless otherwise specified, the term "about" (e.g., in contexts other than numerical values) may be assumed to have its ordinary and customary definition, as understood and consistent with the context of this specification.

[0041] The recitation of numerical ranges expressed by endpoints includes all numbers within that range (including the endpoints) (e.g., 1 to 5 includes 1, 1.5, 2, 2.75, 3, 3.80, 4, and 5). Although some suitable sizes, ranges, and / or values ​​are disclosed for various components, features, and / or specifications, those skilled in the art to which the present invention relates will understand that the desired sizes, ranges, and / or values ​​can be derived from those explicitly disclosed.

[0042] As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the content clearly indicates otherwise. As used in this specification and the appended claims, the term "or" is generally used in a sense that includes "and / or", unless the content clearly indicates otherwise. It should be noted that, for ease of understanding, certain features of the present invention may be described in the singular, even if those features may be plural or repeated in the disclosed embodiments. Each instance in a feature may include and / or contain a singular disclosure unless explicitly indicated to the contrary. For simplicity and clarity, not all elements of the present invention will necessarily be shown in each figure or discussed in detail below. However, it should be understood that, unless explicitly stated to the contrary, the following discussion may be equally applicable to any and / or all of the components where there is more than one. Additionally, for clarity, all instances of some elements or features may not be shown in each figure.

[0043] It should be noted that references to "one embodiment," "some embodiments," "other embodiments," etc. indicate that the described embodiments may include a particular feature, structure, or characteristic, but each embodiment may not necessarily include the particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with one embodiment, whether or not explicitly described, it is within the knowledge of those skilled in the art to implement such feature, structure, or characteristic in conjunction with other embodiments, unless explicitly stated to the contrary. That is, the various individual elements described below, even if not explicitly shown in a particular combination, may still be considered to be combinable or arranged with each other to form other additional embodiments, or to supplement and / or enrich the described embodiments, as will be understood by those of ordinary skill in the art.

[0044] For the sake of clarity, certain identifying digital nomenclature (e.g., first, second, third, fourth, etc.) can be used throughout the specification and / or claims to name and / or distinguish various descriptions and / or claimed features. It should be understood that the digital nomenclature is not intended to be limiting and is merely illustrative. In certain embodiments, for the sake of brevity and clarity, the digital nomenclature previously used can be changed and deviated from. That is, the feature identified as a "first" element can be referred to as a "second" element, a "third" element, etc., later, or can be omitted completely, and / or different features can be referred to as a "first" element. The meaning and / or name in each case will be apparent to the technician.

[0045] The detailed description is intended to illustrate, rather than limit, the present invention. Those skilled in the art will recognize that the various elements described may be arranged in various combinations and configurations without departing from the scope of the present invention. The detailed description describes example embodiments of the present invention.

[0046] refer to Figure 1 , depicting an illustrative endoscope 100, and Figure 2 An illustrative endoscope system 200 is depicted. Endoscope 100 may include an elongated tube or shaft 100a configured to be inserted into a subject (eg, a patient).

[0047] The light source 205 of the endoscope system 200 can feed illumination light to the distal portion 100b of the endoscope 100. The distal portion 100b of the endoscope 100 can accommodate an imager (e.g., a CCD or CMOS imager) (not shown). The light source 205 (e.g., a lamp) can be located in a video processing unit 210, which processes the signal input from the imager and outputs the processed video signal to a video monitor (not shown) for viewing. The video processing unit 210 can also be used as a component of the air supply circuit / water supply circuit by accommodating a pressurizing pump 215, such as an air supply pump, in the unit 210.

[0048] The endoscope shaft 100a may include a distal tip 100c (e.g., a distal tip unit) disposed at a distal portion 100b of the shaft 100a, and a flexible curved portion 105 proximal to the distal tip 100c. The flexible curved portion 105 may include an articulated joint (not shown) to assist in steering the distal tip 100c. On the end face 100d of the distal tip 100c of the endoscope 100 is a gas / lens cleaning fluid nozzle 220 for supplying gas for insufflation of the interior of the patient at the treatment area, and for supplying water for cleaning the lens covering the imager. An irrigation opening 225 in the end face 100d supplies irrigation fluid to the treatment area of ​​the patient. An illumination window (not shown) for transmitting illumination light to the treatment area and an opening 230 to a working channel 235 extending along the shaft 100a for delivering tools to the treatment area may also be included on the face 100d of the distal tip 100c. The working channel 235 may extend along the shaft 100a to a proximal channel opening 110 positioned distally of an operating handle 115 (eg, a proximal handle) of the endoscope 100. The channel opening 110 may be sealed with a biopsy valve 120 to prevent unwanted fluid outflow.

[0049] The operating handle 115 may be provided with a knob 125 for providing remote 4-way steering of the distal tip (e.g., one knob controls up and down steering, and another knob controls left and right steering) via a wire connected to an articulated joint in the bendable flexible portion 105. A plurality of video switches 130 for remotely operating the video processing unit 210 may be arranged on the proximal side of the handle 115.

[0050] The handle 115 may be provided with dual valve locations 135. One of the valve locations 135 may receive the gas / water valve 140 for operating the insufflation gas and lens water supply operations. The gas supply line 240a and the lens cleaning fluid supply line 245a run distally from the gas / water valve 140 along the shaft 100a and converge at the distal tip 100c proximal to the gas / cleaning fluid nozzle 220 ( Figure 2 ).

[0051] Another valve location 135 can receive a suction valve 145 for a suction operation. A suction supply line 250a can run distally from the suction valve 145 along the shaft 100a to a junction in fluid communication with the working channel 235 of the endoscope 100.

[0052] The operating handle 115 can be electrically and fluidically connected to the video processing unit 210 via a connector portion 265 extending between the flexible umbilicus 260 and the endoscope. The flexible umbilicus 260 has a gas (e.g., air or CO2) supply line 240b, a lens cleaning fluid supply line 245b, a suction supply line 250b, an irrigation supply line 255b, a light guide (not shown), and an electrical signal cable (not shown). The connector portion 265 connects the light source 205 in the video processing unit to the light guide when inserted into the video processing unit 210. The light guide runs along the length of the umbilicus 260 and the endoscope shaft 100a to transmit light to the distal tip 100c of the endoscope 100. The connector portion 265 also connects the air pump 215 to the gas supply line 240b in the umbilicus 260 when inserted into the video processing unit 210.

[0053] A water reservoir or container 270 (e.g., a water bottle) can be fluidly connected to the endoscope 100 through the connector portion 265 and the umbilicus 260. A length of gas supply tubing 240c passes from one end positioned in the air gap 275 between the top 280 (e.g., a bottle cap) of the reservoir 270 and the remaining water 285 in the reservoir to a removable gas / lens cleaning fluid connector 290 on the exterior of the connector portion 265. The gas supply line 240b from the umbilicus 260 branches in the connector portion 265 to be in fluid communication with the gas supply tubing 240c at the removable gas / lens cleaning fluid connector 290 and the air pump 215. When the gas supply tubing 240c is on the connector portion 265, a length of lens cleaning fluid tubing 245c, one end of which is positioned at the bottom of the reservoir 270, can pass through the top 280 of the reservoir to the same removable connector 290. In other embodiments, the connectors may be separate and / or separate from one another. The connector portion 265 may also have a detachable irrigation connector 293 for traveling from an irrigation water source (not shown) to an irrigation supply tubing (not shown) of an irrigation supply line 255b in the umbilicus 260. In some embodiments, irrigation water is supplied from a water source (not shown) independent of the water reservoir 270 via a pump (e.g., a peristaltic pump). In some embodiments, the irrigation supply tubing and the lens cleaning fluid tubing 245c may obtain water from the same reservoir. The connector portion 265 may also include a detachable suction connector 295 for fluidly connecting a vacuum source (e.g., hospital house suction) (not shown) to the suction supply line 250b and suction supply line 250a of the umbilicus 260 and the endoscope 100.

[0054] Gas supply line 240b and lens cleaning fluid supply line 245b may be fluidly connected to valve position 135 of gas / water valve 140 and configured such that operation of the gas / water valve in the well controls the supply of gas or lens cleaning fluid to distal tip 100c of endoscope 100. Suction supply line 250b is fluidly connected to valve position 135 of suction valve 145 and configured such that operation of suction valve 145 in the well controls suction applied to working channel 235 of endoscope 100.

[0055] The suction valve 145 can be configured to allow or prevent suction and / or suction effects in the working channel 235. When the suction valve 145 is in a valve closed position (e.g., a first configuration), the flow of suction fluid through the working channel 235 may be blocked by the suction valve 145. When suction is required in the working channel 235, the operator or user can actuate the suction valve 145 (e.g., by pressing a button on the valve and / or actuating the suction valve 145 in one or more other suitable ways) to bring the suction valve 145 to a valve open position (e.g., a second configuration). When the suction valve 145 is in the valve open position, the flow channel inside the suction valve can connect the working channel 235 to the suction valve, which is coupled to the suction connection 295, and the suction device can create a negative pressure that draws fluid into and out of the working channel 235 through an outlet disposed in the suction valve. When the operator or user releases the suction valve 155 , the valve 145 may return to its valve closed position and reduce or block the flow of suction fluid from the working channel 235 .

[0056] In some cases, the suction valve 145 can rely on the path of least resistance to direct the flow of suction fluid to be drawn through the endoscope system 200. In some cases, when the suction pump is turned on for a procedure, the pump remains on throughout the procedure and continuously draws air from the flexible umbilicus 260, which in turn draws fluid from the wire side of the endoscope 100, which travels up the umbilicus 260 and connects to a port at the suction valve 145. When the suction valve 145 is in a first position and / or configuration (e.g., a closed position), the suction force or negative pressure from the suction pump is blocked from the working channel 235, and fluid can be drawn from the atmosphere through the suction valve 145. When the suction valve 145 is actuated to a second position and / or configuration (e.g., an open position) (e.g., when a button or cap associated with the suction valve 145 is depressed and / or actuated in one or more other suitable manners), the opening from the atmosphere through the suction valve 145 to the suction pump can be effectively closed or blocked by the suction valve 145, and a fluid path between the working channel 235 and the suction pump through the suction valve 145 can be opened. Thus, fluid moving to the suction pump can follow a path of least resistance, where the path can change depending on whether the suction valve 145 is in the first position (e.g., closed position) or the second position (e.g., open position).

[0057] In some cases, the valve stem of the suction valve 145 can be configured to have a tight fit with a valve well configured to receive the valve stem in the endoscope 100. In the suction valve 145, when the valve stem is in the first position, the tight fit blocks the flow path or increases the flow resistance between the working channel 235 and the suction pump, and reduces the flow resistance between the atmosphere and the suction pump. Similarly, when the valve stem is in the second position, the tight fit blocks the flow path or increases the flow resistance between the atmosphere and the suction pump, and reduces the flow resistance between the working channel 235 and the suction pump.

[0058] The suction valve 145 configured to block flow using a tight fit between the valve stem and the valve well requires a precisely manufactured valve stem. The precision required to produce a suction valve with a tight fit requires expensive materials (e.g., metal, etc.), highly accurate machinery, and takes a lot of time to achieve.

[0059] Additionally, the suction valve 145 with a close-fitting valve stem and valve well is manufactured to have at least some clearance to allow the valve stem to adjust its position in the valve well. This clearance may cause leakage during use, which may cause two problems that can be noticed by the physician. The first problem is that when the suction valve 145 is in a position intended to block suction from the working channel 235, there is still some suction flow through the working channel 235 and the suction valve 145 to the suction pump. The smaller the clearance between the valve stem and the valve well, the less unwanted flow through the working channel 235 occurs, and the larger the clearance, the more unwanted flow through the working channel 235, however, the clearance is still needed to facilitate the movement of the valve stem in the valve well. When the flow actively moves up along the working channel 235 in this form of the suction valve 235, even when the suction valve 145 is in a position intended to block the suction flow from the working channel 235, the user may also perceive the suction as "bad gas" because the suction of the suction pump draws volume from the body cavity where the user is working. Second, flow from the atmosphere to the suction pump may not be completely blocked when the valve stem of the suction valve 145 is in a position within the valve well for facilitating suction flow between the working channel 235 and the suction pump through the suction valve 145. Any such leakage from the atmosphere can reduce the pressure differential between the suction valve and the distal end of the working channel 235, which can result in reduced suction force or negative pressure, reduced flow rate, and inflation flow through the flow path to the suction pump.

[0060] When intended for repeated use in multiple procedures, an aspiration valve 145 configured to operate with a close-fitting valve stem and valve well may work well enough because the price point of such aspiration valve may be high enough to justify manufacturing the aspiration valve 145 with materials and with the necessary precision to achieve and maintain the desired tolerances over the useful life of the reusable aspiration valve 145. However, the price point of a single-use aspiration valve may not allow for the use of the necessary materials, tooling, and / or precision manufacturing required to achieve and / or maintain the tolerances over the useful life of the single-use aspiration valve.

[0061] The configuration of the aspiration valve for endoscope 100 and / or other suitable scopes discussed herein addresses the above-mentioned problems with existing aspiration valves and is configured to mitigate and / or eliminate leakage along unintended flow paths through aspiration valve 145 . Figure 3 A schematic perspective view of an illustrative suction valve 145 configured to mitigate and / or eliminate leakage along an unintended flow path through the suction valve 145 is depicted.

[0062] Figure 3The suction valve 145 depicted in FIG. 1 includes a cap or button 146, a collar 148, and a body 150, wherein the body 150 can define a suction port 152 and a working channel port 154. The collar 148 can define an opening 156 (e.g., a proximal opening of a valve well 158, such as Figure 4 and 5 14 and 15 (see Figure 14A and 14B ) for fluid from the atmosphere (e.g., air) to flow through the suction valve 145. Although certain components of the suction valve 145 are depicted and described, it is also contemplated that other suitable components of the suction valve 145 and / or certain depicted and described components of the suction valve may be combined to form a single component and / or separated to form multiple components.

[0063] In some cases, collar 148 and body 150 can form, be part of, and / or define valve well 158 (e.g., Figure 4 and Figure 5 Although the collar 148 and body 150 are depicted as separate components, the valve well 158 may be formed from a single component if desired and incorporate one or more of the features of the collar 148 and body 150 discussed herein.

[0064] In operation, Figure 3 The suction valve 145 depicted in FIG can have a first position or configuration (e.g., a relaxed or closed position) and a second position or configuration (e.g., an actuated or open position). When the suction valve 145 is in the first position, the suction valve is configured to create a fluid path between the opening 156 to the atmosphere and the suction port 152. When the suction valve 145 is in the second position, the suction valve 145 is configured to create a fluid path between the working channel port 154 and the suction port 152.

[0065] Figure 4 Depicted Figure 3 Schematic cross-sectional view of the suction valve 145 depicted in FIG, wherein the suction valve 145 is in a first position (eg, a relaxed or closed position). Figure 4 , the collar 148 can be coupled to the body 150. The collar 148 can be coupled to the body 150 directly or indirectly in any suitable manner, including but not limited to via an adhesive, a threaded connection, a Luer lock connection, a snap connection, a ball-and-pawl connector, a friction fit, and / or additional or alternative coupling techniques. In some cases, the collar 148 can be coupled to the body 150 via an intermediate component 151 that is threadedly coupled to the body 150 and coupled to the collar 148 via a snap connection, such as Figure 4 and Figure 5 , but this is not required.

[0066] Figure 4 The body 150 of the valve well 158 depicted in the figure can be configured to receive a valve stem 160 that is in communication with the cover 146. For example, the body 150 can define a first cavity 162 (e.g., a suction cavity) that opens to or extends from the suction port 152, a second cavity 164 (e.g., a working channel cavity) that is defined at or extends from the working channel port 154, and a body opening 166 (e.g., a proximal opening of the body 150) that is configured to receive the valve stem 160. In some cases, the body opening 166 can be configured to receive fluid from the atmosphere, which travels through the opening 156 to the atmosphere and enters the valve stem 160. In addition to the body opening 166, the valve well 158 can also include a distal opening 167 that opens to the suction port 152 through the first cavity 162, and an intermediate opening 169 between the body opening 166 and the distal opening 167 that opens to the working channel port 154 through the second cavity 164. Additionally or alternatively, the valve well 158 may include one or more other suitable openings and / or opening configurations.

[0067] In some cases, the valve well 158 can be configured to facilitate translation (e.g., longitudinal translation and / or rotational translation) of the valve stem 160 in the body 150 and / or the collar 148 in response to forces acting on the valve stem 160. In addition, the valve well 158 can have openings to the first cavity 162 and the second cavity 164, as discussed. In some cases, the valve well 158 can be in fluid communication with and / or define the suction port 152, the first cavity 162, the working channel port 154, the second cavity 164, and the body opening 166, wherein translation of the valve stem 160 within the valve well 158 can adjust the flow path through the suction valve 145.

[0068] The suction valve 145 may also include one or more biasing mechanisms 168. The biasing mechanism 168 may be any suitable type of biasing mechanism configured to bias the lid 146 to a first position, allow the lid 146 to adjust to a second position in response to a force applied to the lid 146, and return the lid 146 to the first position when the force applied to the lid 146 is completely or at least partially removed from the lid 146. In one example, the biasing mechanism 168 may be a spring, such as a Figure 4 , but this is not required and other suitable biasing mechanisms are contemplated.

[0069] When the suction valve 145 includes a cap 146 and a collar 148, the biasing mechanism 168 can extend between the cap 146 and the valve well 158 (e.g., between the cap 146 and the collar 148 when the collar 148 is included) to facilitate adjustment of the cap 146 relative to the body 150 and / or the collar 148. In some cases, the biasing mechanism 168 can extend between the cap 146 and a shelf or shoulder 170 of the collar 148, wherein the collar 148 can at least partially define the opening 156 to the atmosphere. Alternatively or additionally, the biasing mechanism 168 can extend between the cap 146 and / or one or more other suitable components of the suction valve 145 to facilitate adjustment of the cap 146 relative to the body 150.

[0070] The valve stem 160 can be coupled to the cap 146 in any suitable manner. In some cases, a portion 178 (e.g., a proximal portion) of the valve stem 160 that extends proximally of the first opening 172 can be coupled to the cap 146 via one or more suitable coupling mechanisms. Example suitable coupling mechanisms include, but are not limited to, adhesives, threaded connections, Luer lock connections, snap connections, ball-and-detent connectors, friction fits, and / or additional or alternative coupling mechanisms.

[0071] The valve stem 160 can have any suitable configuration configured to adjust a position within the valve well 158, adjust a flow path to the suction port 152, and couple to the cap 146. In one example, the valve stem 160 can be elongated and define a first opening 172, a second opening 174, and a cavity 176 extending between the first opening 172 and the second opening 174. In addition, the valve stem 160 can include a portion 178 extending proximally of the first opening 172, which can be configured to couple to the cap 146.

[0072] The first opening 172, the second opening 174, and the cavity 176 can have any suitable configuration that is configured or otherwise designed to facilitate adjustment of the flow path within the suction valve 145 based on the position of the valve stem 160 relative to the valve well 158. In one illustrative configuration, the first opening 172 of the valve stem 160 can be a proximal opening of the valve stem 160. In some cases, as desired, the first opening 172 can be a side or radial opening in fluid communication with the cavity 176, but this is not required, and the first opening 172 can be an axial or end opening in the valve stem 160. Although not required, the second opening 174 of the valve stem 160 can be a distal opening of the valve stem 160. The second opening 174 can be located at the distal end of the valve stem or at least distal to the first opening 172. In some cases, as desired, the second opening 174 can be an axial or end opening in the valve stem 160 in fluid communication with the cavity 176, such as Figure 4As depicted, this is not required, and the second opening 174 may be a side opening.

[0073] The valve stem 160 may include one or more seals 179 configured to translate with the valve stem 160. Figure 4 , the valve stem 160 may include a first seal 179a, a second seal 179b, and a third seal 179c. The seals 179 may be configured around the valve stem 160 in any suitable manner to interact (e.g., contact) with the inner wall or walls of the valve well 158 to create a barrier to fluid flow. Illustratively, the first seal 179a may extend completely or at least partially around the valve stem 160 at a location proximal to the first opening 172 of the valve stem 160, the second seal 179b may extend completely or at least partially around the valve stem 160 at a location distal to the first opening 172, and the third seal 179c may extend completely or at least partially around the valve stem 160 at a location distal to the second seal 179b, although other suitable configurations are also contemplated.

[0074] The valve stem 160 can be configured to have an increased clearance within the valve well 158 when compared to conventional valve stems, and particularly when compared to reusable valve stems. For example, a conventional valve stem can be configured to have a clearance of less than about 0.002 inches within the valve well, such as a clearance of about 0.002 to about 0.0005 inches, wherein the body of the valve stem 160 of the present invention can have a circumferential clearance of at least about 0.005 inches from the inner wall of the valve well 158. In one example, the body of the valve stem 160 can be sized (e.g., configured) to have a clearance of about 0.005 inches to about 0.010 inches from the inner wall of the valve well 158. The ability to form the valve stem 160 to have a greater clearance within the valve well 158 relative to conventional valve configurations facilitates the creation of the suction valve 145 using less precise manufacturing techniques and / or materials with more variable tolerances than conventionally used for endoscopic suction valves. Other suitable clearances and / or dimensions are contemplated.

[0075] Figure 4 and Figure 5 The cross-sectional view of FIG. 1 depicts the operation of the suction valve 145. Figure 4 As shown, the valve stem 160 and the suction valve 145 are in an illustrative first configuration (e.g., a relaxed or closed position). Figure 5 As shown, the valve stem 160 and the suction valve 145 are in an illustrative second configuration (eg, an actuated or open position).

[0076] When the valve stem 160 and the suction valve 145 are in the illustrative first configuration, the biasing force of the biasing mechanism 168 (e.g., a force acting in the direction of arrow 180) can bias the valve stem 160 at least partially in the valve well 158 in a proximal direction such that the opening 156 to atmosphere, the body opening 166, and the distal opening 167 are in fluid communication. Figure 4 As shown, the valve stem 160 can be biased proximally so that the flow path along the arrow 182 connects the atmosphere with the suction pressure through the opening 156 to the atmosphere, the body opening 166, the first opening 172 of the valve stem 160, the second opening 174 of the valve stem 160, and the cavity 176 between the first opening 172 and the second opening 174. When the valve stem 160 is in the first form, the first seal 179a can engage the retaining ring 148 (when included) and can be located proximal to the intermediate opening 169 and the main body opening 166, the second seal 179b can be located distal to the main body opening 166 and proximal to the intermediate opening 169 and can contact the inner wall of the valve well 158, the second seal 179b can be a barrier between the main body opening 166 and the intermediate opening 169, the third seal 179c can be located distal to the intermediate opening 169 and can contact the inner wall of the valve well 158, the third seal 179c can be a barrier between the intermediate opening 169 and the distal opening 167, and due to the positioning of the second seal 179b, the third seal 179c and the wall of the valve stem 160, the intermediate opening 169 and / or the fluid therein (indicated by arrow 184) can be isolated from the cavity 176 of the valve stem 160, the distal opening 167 and the suction pressure fluid.

[0077] When the valve stem 160 and the suction valve 145 are in the illustrative second configuration, a force acting on the cap or button 146 in the direction of arrow 185 (e.g., in a direction opposite or substantially opposite to arrow 180) resists (e.g., opposes) the biasing force of the biasing mechanism 168 to adjust the valve stem 160 at least partially in the valve well 158 in a distal direction to adjust the valve stem 160 from the first configuration to the second configuration such that the intermediate opening 159 and the distal opening 167 are in fluid communication. For example, as Figure 5As shown, the valve stem 160 can be adjusted proximally so that the flow path along the arrow 184 connects the fluid from the working channel of the endoscope with the suction pressure through the working channel port 154, the second cavity 164, the intermediate opening 169, the first opening 172 of the valve stem 160, the second opening 174 of the valve stem 160, and the cavity 176 between the first opening 172 and the second opening 174. When the valve stem 160 is in the second form, the first seal 179a can be located proximal to the intermediate opening 169 and distal to the main body opening 166, the first seal 179a can be a barrier between the proximal opening or the opening 156 to the atmosphere and the intermediate opening 169, the third seal 179c can be located distal to the intermediate opening 169 and can be a barrier 167 between the intermediate opening 169 and the distal opening, and due to the positioning of the first seal 179a and the wall of the valve stem 160, the proximal opening 156 and / or the fluid from the atmosphere passing therethrough (indicated by arrow 182) can be isolated from the cavity 176 of the valve stem 160 and the suction pressure fluid. In some cases, the valve stem 160 can be configured such that when the valve stem 160 is in the second form, the second seal 179b can be located distal to the intermediate opening 169, and one or both of the second seal 179b and the third seal 179c can be a barrier between the intermediate opening 169 and the distal opening 167, but this is not required.

[0078] Figure 6 A perspective view of an illustrative valve stem body 186 (e.g., the body of the valve stem 160 without the seal 179 thereon) is depicted. The valve stem body 186 can define a first opening 172 of the valve stem 160, a second opening 174 of the valve stem 160, and a cavity 176 extending between the first opening 172 and the second opening 174. Additionally or alternatively, the valve stem body 186 can define one or more recessed portions 188. Figure 6 , the valve stem body 186 can define a first recessed portion 188a, a second recessed portion 188b, and a third recessed portion 188c. Although not required, the first recessed portion 188a can be associated with at least a portion of the first seal 179a and / or configured to receive at least a portion of the first seal 179a and can be located proximal to the first opening 172, the second recessed portion 188b can be associated with at least a portion of the second seal 179b and / or configured to receive at least a portion of the second seal 179b and can be located distal to the first opening 172, and the third recessed portion 188c can be associated with at least a portion of the third seal 179c and / or configured to receive at least a portion of the third seal 179c and can be located distal to the second recessed portion 188b.

[0079] In some cases, the valve stem body 186 can include one or more recessed portions 190 (e.g., channels or flow passages) extending between recessed portions 188 configured to receive the seal 179, as discussed in more detail below. In one example, a first elongated or longitudinally extending recessed portion 190a can extend between a first recessed portion 188a and a second recessed portion 188b, and a second elongated or longitudinally extending recessed portion 190b can extend between the second recessed portion 188b and a third recessed portion 188c. Although the first elongated recessed portion 190a and the second recessed portion 190b are substantially parallel to each other, the first elongated recessed portion 190a and the second elongated longitudinally extending recessed portion 190b can extend between the second recessed portion 188b and the third recessed portion 188c. Figure 6 Although shown as aligned, this is not required and the elongated recessed portions 190a, 190b may be offset from each other. Figure 6 Two elongated recessed portions 190a, 190b are depicted, but other suitable numbers of recessed portions 190 connected to the recessed portion 188 configured to receive the seal 179 are also contemplated.

[0080] The proximal portion 178 and the valve stem body 186 of the valve stem 160 can be of any suitable configuration. In one example, the proximal portion 178 can be elongated and can have a consistent cross-sectional diameter along its length, such as Figure 4 and Figure 5 In another example, the proximal portion 178 can have different diameters along its length to facilitate receiving and / or connecting to the cap or button 146 and / or for one or more other suitable purposes.

[0081] The valve stem body 186 can be formed in any suitable manner. In some cases, although not required, the valve stem 160 can be formed using a molding process, an injection molding process, a casting process, a finishing process, grinding, and / or by or using one or more additional or alternative manufacturing techniques. In one illustrative example, the valve stem body 186 can be formed using an injection molding process.

[0082] Figure 7 Depicted is a perspective view of a valve stem 160 wherein a seal 179 has been formed on the Figure 6158 and is configured to span the gap between the stem body 186 and the inner wall of the valve well 158 so as to form a barrier between the stem body 186 and the valve well 158 to prevent fluid from passing the seal 179. The seal 179 can be applied to the stem body 186 in any suitable manner. In one example, the seal 179 can be overmolded onto the stem body 186 (e.g., in the recessed portion 188) by a suitable process, such as an injection molding process. Alternatively or additionally, the seal 179 can be wrapped onto the stem body 186 and into the recessed portion 188. Other suitable techniques for forming the seal 179 of the stem body 186 and the valve stem 160 are contemplated, including but not limited to co-extrusion.

[0083] The recessed portions 190 can facilitate overmolding of the seals 179 into the recessed portions 188. For example, during an overmolding process, material for the seals 179 can be applied to the circumferentially extending recessed portions 188 via one or more of the elongated recessed portions 190 connecting the circumferentially extending recessed portions 188, thereby forming one or more lengths 192 of material (e.g., a first length 192a of material and a second length 192b of material, such as a seal 179) that connect each of the seals 179 to an adjacent seal 179. Figure 7 ). The illustrative recessed portions 188, 190 can facilitate application of the material forming the seal 179 to the valve stem body 186 at a single gate or injection point that is not located at the seal 179. Utilizing a gate or injection point to apply the material of the seal 179 to the valve stem body 186 at a location spaced apart from the seal 179 (e.g., along the recessed portion 190) can facilitate post-processing of the material to smooth the gate by isolating post-processing of the gate (if any) to a location spaced apart from the seal 179. For example, after injection, there may be a slight pit or slight small protrusion of material at the gate, which would be undesirable if it were located at the seal.

[0084] The valve stem body 186 and the seal 179 can be formed of any suitable material. In some cases, the valve stem body 186 can be formed of a first material and the seal 179 can be formed of a second material, wherein the second material can be the same as or different from the first material. The valve stem body 186 can be formed of a hard or rigid polymer, and the seal 179 can be formed of a flexible polymer, but this is not required. In one example, the valve stem body 186 can be formed of one or more of a metal, a polymer, acrylonitrile butadiene styrene (ABS), polycarbonate, and / or other suitable materials. In another example, the seal 179 can be formed of one or more of a polymer, a thermoplastic elastomer (TPE), a thermoplastic polyurethane (TPU), a liquid silicone rubber (LSR), and / or other suitable materials.

[0085] The material of the seal 179 can have any suitable hardness. In one example, the material of the seal 179 when formed on the valve stem body 186 can have a hardness in the range of about 20 to 80 Shore A, about 30-60 Shore A, and / or other suitable values ​​in one or more other suitable hardness ranges, but can be softer or harder depending on the geometry used for the seal and the amount of interference required for the valve well 158. In one example, the seal 179 can be formed of silicone having a hardness in the range of 40 to 50 Shore A, but this is not required.

[0086] The seal 179 can have any suitable shape that is configured to form a fluid barrier along the space between the valve stem body 186 and the inner wall of the valve well 158. For example, suitable shapes and / or configurations of the seal 179 can include, but are not limited to, an O-ring (e.g., circular cross-section), an X-shaped cross-section O-ring, a wiper seal ring, a disc ring, a pre-configured seal applied to a circumferentially extending recess 188, and / or other suitable shapes and / or configurations of the seal 179.

[0087] like Figure 8 As depicted in , the distal end of the valve stem 160 includes a seal 179, which is a protruding disc configured to scrape along the inner surface of the valve well 158 as the valve stem 160 translates within the valve well 158. Even so, the geometry of the seal relative to the width or diameter of the valve stem body 186 and / or recess 188 may be larger than Figure 8 The depicted seal 179 is wider or narrower, depending on the material selected to form the seal 179, in order to achieve the desired friction force under interference with the valve well 158. In some cases, the geometry and / or material of the seal 179 can be configured to minimize the forces normal to the wall of the valve well 158 while allowing the seal 179 to maintain a fluid barrier between the valve stem body 186 and the inner wall of the valve well 158, but this is not required.

[0088] Fig. 9 A method 300 of forming a valve stem (e.g., valve stem 160 and / or other suitable valve stem) for an endoscope (e.g., endoscope and / or other suitable endoscope) is depicted. The method may include forming 302 a body of the valve stem (e.g., valve stem body 188 and / or other suitable body of the valve stem) and forming 304 one or more seals (e.g., seal 179 and / or other suitable seals) around the body. Once the valve stem is formed, the valve stem may be inserted into a valve well and coupled to a cap or button to form a suction valve (e.g., suction valve 145 and / or other suitable suction valve).

[0089] In some cases, forming 302 the body of the valve stem can include forming the body from a first material. In addition, the body can include one or more circumferential recesses (e.g., recess 188 and / or other suitable recesses) configured to receive a seal. In one example, forming 302 the body of the valve stem can include forming a first circumferential recess, forming a second circumferential recess, and forming a third circumferential recess in the body of the valve stem. As desired, the recesses can be formed in a single forming step (e.g., using injection molding and / or other suitable manufacturing techniques) and / or formed separately.

[0090] In some cases, the recesses can be connected by one or more longitudinally extending recesses (e.g., elongated recessed portion 190 and / or other suitable recesses) configured to couple the circumferential recessed portions to each other. In one example, a first longitudinal recess can be formed between a first circumferential recess and a second circumferential recess, and a second longitudinal recess can be formed between a second circumferential recess and a third circumferential recess.

[0091] In addition, the body forming 302 the valve stem may include a first opening (e.g., a side or radial opening and / or other suitable openings), a second opening (e.g., an end or terminal opening and / or other suitable openings), and a cavity extending between the first opening and the second opening. When the valve stem body includes the first opening and the second opening, the first circumferential recess may be formed proximal to the first opening, and the second and third circumferential recesses may be formed distal to the first opening.

[0092] Forming 304 seals around the body can include forming seals in each circumferential recess of the body. In one example, a first seal can be formed in a first circumferential recess, a second seal can be formed in a second circumferential recess, and a third seal can be formed in a third circumferential recess. In some cases, a seal can be formed around the body by forming a first seal in a first circumferential recess, a second seal in a second circumferential recess, a third seal in a third circumferential recess, a material of a first length linking the first seal to the second seal in a first longitudinal recess, and a material of a second length linking the second seal to the third seal in a second longitudinal recess. In addition, forming 304 seals can include forming a seal by a second material different from the first material, but this is not necessary. In some cases, the second material can be overmolded onto the first material, but this is not necessary. Alternatively or additionally, the seal can be preformed (e.g., as an O-ring and / or other suitable preformed configuration) and formed around the body by applying the preformed seal to a desired position along the body.

[0093] In some cases, forming the seal around the body can include forming the seal while forming the body. In one example, the body and the seal of the valve stem can be co-extruded and molded with one or more materials. In another example, the valve stem can be integral so that the body and the seal are formed from a single material using molding and / or machining techniques.

[0094] It should be understood that the present invention is in many respects merely illustrative. Changes may be made in details, particularly in matters of shape, size, and arrangement of steps, without exceeding the scope of the present invention. To the extent appropriate, this may include using any of the features of an example embodiment used in other embodiments. Of course, the scope of the present invention is defined by the language of the appended claims.

Claims

1. A suction valve assembly for a medical device, comprising: a valve well having a proximal opening, a distal opening, and an intermediate opening positioned between the proximal opening and the distal opening; A valve stem configured to translate within the valve well, the valve stem comprising: First opening; a second opening; and a cavity extending from the first opening to the second opening; a first seal extending circumferentially around the valve stem at a location proximal to the first opening; a second seal extending circumferentially around the valve stem at a location distal to the first opening; and a third seal extending circumferentially around the valve stem at a location distal to the second seal; and wherein the valve stem has a first configuration in the valve well, wherein the second seal is a barrier between the proximal opening and the intermediate opening, the third seal is a barrier between the intermediate opening and the distal opening, and the cavity is fluidly isolated from the intermediate opening; wherein the valve stem has a second configuration in the valve well, wherein the first seal is proximal to the intermediate opening and the cavity is fluidly isolated from the proximal opening, and wherein the first seal is a barrier between the proximal opening and the intermediate opening.

2. The suction valve assembly of claim 1, wherein when the valve stem is in the first configuration, the proximal opening and the distal opening are in fluid communication through the cavity of the valve stem.

3. The suction valve assembly of claim 1 or claim 2, wherein when the valve stem is in the second configuration, the intermediate opening and the distal opening are in fluid communication through the cavity of the valve stem.

4. The suction valve assembly according to any one of claims 1 to 3, wherein when the valve stem is in the first configuration, the third seal is located distal to the intermediate opening, and the distal opening is fluidically isolated from the intermediate opening.

5. The suction valve assembly according to any one of claims 1 to 4, wherein the second seal and the third seal are configured to contact an inner wall of the valve well when the valve stem is in the first configuration.

6. The suction valve assembly according to any one of claims 1 to 5, wherein the first opening is a radial opening in the valve stem and the second opening is an axial opening in the valve stem.

7. The suction valve assembly according to any one of claims 1 to 6, wherein the valve well further comprises: a body defining said intermediate opening and said distal opening; as well as a collar coupleable to the body, the collar defining the proximal opening; as well as Wherein the first seal is configured to engage the collar when the valve stem is in the first configuration.

8. The suction valve assembly according to any one of claims 1 to 7, further comprising: a cap coupled to the valve stem; a biasing mechanism extending between the cover and the valve well; as well as wherein the biasing mechanism is configured to bias the valve stem to the first configuration; and Wherein the cover, the biasing mechanism, the valve stem and the valve well are configured such that actuation of the cover in a direction opposite to the direction of the biasing force of the biasing mechanism is configured to adjust the valve stem from the first configuration to the second configuration.

9. The suction valve assembly according to any one of claims 1 to 8, wherein the valve stem comprises: a first circumferential recessed portion where the first sealing member is located; a second circumferential recessed portion where the second sealing member is located; as well as A longitudinal recessed portion extends between the first circumferential recessed portion and the second circumferential recessed portion.

10. The suction valve assembly according to any one of claims 1 to 9, wherein the valve stem comprises: a first circumferential recessed portion where the first sealing member is located; a second circumferential recessed portion where the second sealing member is located; a third circumferential recessed portion where the second sealing member is located; a first longitudinal recess extending between the first circumferential recessed portion and the second circumferential recessed portion; as well as a second longitudinal recess extending between the second circumferential recessed portion and the third circumferential recessed portion; and Wherein material forming one or more of the first seal, the second seal and the third seal extends within one or both of the first longitudinal recess and the second longitudinal recess.

11. A suction valve assembly for use in an endoscope, the endoscope having a lumen configured to extend into a body cavity of a patient, the suction valve assembly comprising: a valve well defining a port configured to be in fluid communication with the cavity; as well as a valve stem configured to be adjusted within the valve well, the valve stem comprising a first circumferential seal, a second circumferential seal, a third circumferential seal, a first connecting member extending between the first circumferential seal and the second circumferential seal, and a second connecting member extending between the second circumferential seal and the third circumferential seal; as well as wherein the valve stem is configured to isolate the port from negative pressure fluid when in a first configuration within the valve well; and Wherein the valve stem is configured to fluidly couple the port to the negative pressure and fluidly isolate the port from atmosphere when in a second configuration within the valve well.

12. The suction valve assembly of claim 11, wherein the valve stem further comprises: a first opening, a second opening, and a cavity extending between the first opening and the second opening; wherein the first circumferential seal is located proximal to the first opening; as well as The second circumferential seal and the third circumferential seal are located at the distal side of the first opening.

13. The suction valve assembly according to one of claims 11 or 12, wherein the valve stem further comprises: a first circumferential recess where the first circumferential seal is located; a second circumferential recess in which the second circumferential seal is located; a third circumferential recess where the third circumferential seal is located; a first longitudinal recess where the first connecting member is located; a second longitudinal recess where the second connecting member is located; and The first circumferential seal, the second circumferential seal, the third circumferential seal, the first connecting component and the second connecting component are a single piece of material.

14. A medical device comprising: proximal endoscope handle; a distal tip unit adapted for insertion into a body cavity of a patient; an elongated tube extending between the proximal endoscope handle and the distal tip unit; as well as a suction valve in communication with the lumen of the elongated tube so that the lumen is adjustably fluidly coupled to negative pressure, the suction valve comprising: valve well; as well as a valve stem configured to be adjusted within the valve well, the valve stem comprising a first circumferential seal, a second circumferential seal, and a third circumferential seal; and wherein the valve stem is configured to isolate the cavity from the negative pressure fluid when in a first configuration within the valve well; and Wherein the valve stem is configured to fluidly couple the cavity to the negative pressure and fluidly isolate the cavity from atmosphere when in a second configuration within the valve well.

15. The medical device of claim 14, wherein the valve stem comprises: Radial opening; Axial opening; a valve stem cavity fluidly coupling the radial opening and the axial opening; as well as wherein when the valve stem is in the first configuration, the radial opening is in communication with the atmosphere and the negative pressure fluid; and When the valve stem is in the second configuration, the radial opening is in communication with the negative pressure fluid and is isolated from atmospheric fluid.

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