Suction valve for an endoscope

Abstract

Devices, systems, and methods for a suction valve assembly for a medical device. The suction valve assembly may include a valve well and a valve stem. The valve 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 lumen. The valve well may include a proximal opening, a distal opening, and an intermediate opening. The valve stem is configured to translate within the valve well and adjust between a first configuration in which the third seal is a barrier between the intermediate opening and the distal opening and the lumen is fluidly isolated from the intermediate opening, and a second configuration in which the first seal is a barrier between the proximal opening and the intermediate opening and the lumen is isolated from the proximal opening.

Description

Technical Field

[0001] The present disclosure generally relates to valve assemblies and methods, and more particularly to aspiration valve assemblies and methods for endoscopes.

Background Art

[0002] A wide variety of in-vivo medical devices and systems have been developed for medical applications, such as endoscopic procedures. Some of these devices and systems include guidewires, catheters, catheter systems, endoscopic instruments, and the like. These devices and systems are manufactured by any one of a variety of different manufacturing methods and can be used according to any one of a variety of methods. Each of the known medical devices, systems, and methods has specific advantages and disadvantages. There is still a need to provide alternative medical devices and systems, as well as alternative methods for manufacturing and using medical devices and systems.

Summary of the Invention

[0003] The present disclosure provides alternative forms of design, materials, manufacturing methods, and use for medical devices and medical systems. In a first example, a suction valve assembly for a medical device includes a valve well having a proximal opening, a distal opening, and an intermediate opening located between the proximal opening and the distal opening, and a valve stem configured to translate within the valve well. The valve stem includes a first opening, a second opening, a lumen extending from the first opening to the second opening, a first seal extending circumferentially around the valve stem at a proximal position of the first opening, a second seal extending circumferentially around the valve stem at a distal position of the first opening, and a third seal extending circumferentially around the valve stem at a distal position of the second seal. The valve stem may have a first configuration within the valve well in which 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 lumen is fluidly isolated from the intermediate opening. The valve stem may have a second configuration within the valve well in which the first seal is proximal to the intermediate opening, the lumen is fluidly isolated from the proximal opening, and the first seal is a barrier between the proximal opening and the intermediate opening.

[0004] 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 the lumen of the valve stem. 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 the lumen of the valve stem.

[0005] 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.

[0006] Alternatively or additionally to any of the above examples, the second seal and the third seal are configured to contact the inner wall of the valve well when the valve stem is in the first configuration.

[0007] Alternatively or additionally to any of the above examples, the first opening is a radial opening of the valve stem and the second opening is an axial opening of the valve stem. Alternatively or additionally to any of the above examples, the valve well includes a body defining an intermediate opening and a distal opening, and a collar connectable to the body, the collar defining a proximal opening.

[0008] 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. Alternatively or additionally to any of the above examples, the suction valve assembly may further include a cap coupled to the valve stem and a biasing mechanism extending between the cap and the valve well, the biasing mechanism being configured to bias the valve stem to the first configuration.

[0009] Alternatively or additionally to any of the above examples, the cap, the biasing mechanism, the valve stem, and the valve well are configured such that actuation of the cap in a direction opposite to the direction of the biasing force of the biasing mechanism adjusts the valve stem from the first configuration to the second configuration.

[0010] Alternatively or additionally to any of the above examples, the valve stem may include a first circumferential recess in which the first seal is located, a second circumferential recess in which the second seal is located, and a longitudinal recess extending between the first circumferential recess and the second circumferential recess.

[0011] Alternatively or additionally to any of the above examples, the valve stem may comprise a first circumferential recess in which the first seal is located, a second circumferential recess in which the second seal is located, a third circumferential recess in which the second seal is located, a first longitudinal recess extending between the first circumferential recess and the second circumferential recess, and a second longitudinal recess extending between the second circumferential recess and the third circumferential recess.

[0012] Alternatively or additionally to any of the above examples, the material forming one or more of the first seal, the second seal, and the third seal extends into one or both of the first longitudinal recess and the second longitudinal recess.

[0013] 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, connecting the first seal to the second seal, and (b) extends along the second longitudinal recess, connecting the second seal to the third seal.

[0014] In another example, a method of forming a valve stem for a suction valve of an endoscope includes forming a valve stem body including a first circumferential recess, a second circumferential recess, and a third circumferential recess from a first material, and forming a first seal in the first circumferential recess, a second seal in the second circumferential recess, and a third seal in the third circumferential recess, where the first seal, the second seal, and the third seal are formed from a second material that is different from the first material.

[0015] Alternatively or additionally to any of the above examples, the valve stem body further comprises a first opening, a second opening, and a lumen extending between the first opening and the second opening, where the first circumferential recess is proximal to the first opening and the second circumferential recess and the third circumferential recess are distal to the first opening.

[0016] 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.

[0017] In another example, a suction valve assembly for use with an endoscope having a lumen configured to extend into a patient's body cavity may include a valve well defining a port configured to be in fluid communication with the lumen, and a valve stem configured to be adjusted within the valve well. The valve stem may include a first circumferential seal, a second circumferential seal, a third circumferential seal, a first connecting component extending between the first circumferential seal and the second circumferential seal, and a second connecting component extending between the second circumferential seal and the third circumferential seal. The valve stem may be configured to fluidly isolate the port from negative pressure when in a first configuration within the valve well, and may be configured to fluidly couple the port to negative pressure and fluidly isolate the port from the atmosphere when in a second configuration within the valve well.

[0018] Alternatively or additionally to any of the above examples, the valve stem may further comprise a first opening, a second opening, and a lumen extending between the first opening and the second opening. The first circumferential seal may be proximal to the first opening, and the second circumferential seal and the third circumferential seal may be distal to the first opening.

[0019] Alternatively or additionally to any of the above examples, the valve stem may further comprise a first circumferential recess in which the first circumferential seal is located, a second circumferential recess in which the second circumferential seal is located, a third circumferential recess in which the third circumferential seal is located, a first longitudinal recess in which the first connecting component is located, and a second longitudinal recess in which the second connecting component is located. The first seal, the second seal, the third seal, the first connecting component, and the second connecting component may be a single piece of material.

[0020] In a further example, a medical device includes a proximal endoscope handle, a distal tip unit adapted to be inserted into a patient's body cavity, an elongate tube extending between the proximal endoscope handle and the distal tip unit, and a suction valve in fluid communication with the lumen of the elongate tube and configured to adjustably fluidly couple the lumen to a negative pressure. The suction valve includes a valve well and a valve stem configured to adjust within the valve well, the valve stem including a first circumferential seal, a second circumferential seal, and a third circumferential seal. The valve stem is configured to fluidly isolate the lumen from the negative pressure when in a first configuration within the valve well, and the valve stem is configured to fluidly couple the lumen to the negative pressure and fluidly isolate the lumen from the atmosphere when in a second configuration within the valve well.

[0021] Alternatively or additionally to any of the above examples, the valve stem may include a radial opening, an axial opening, and a valve stem lumen fluidly coupling the radial opening and the axial opening. The first circumferential seal is located proximal to the radial opening, and the second circumferential seal and the third circumferential seal are located between the radial opening and the axial opening.

[0022] Alternatively or additionally to any of the above examples, the valve stem may include a radial opening, an axial opening, and a valve stem lumen fluidly coupling the radial opening and the axial opening. When the valve stem is in a first configuration, the radial opening is in fluid communication with the atmosphere and the negative pressure, and when the valve stem is in a second configuration, the radial opening is in fluid communication with the negative pressure and is fluidly isolated from the atmosphere.

[0023] These and other features and advantages of the present disclosure will become readily apparent from the following detailed description, and the scope of the claimed invention is set forth in the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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 disclosure.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

DETAILED DESCRIPTION OF THE INVENTION

[0025] The present disclosure is subject to various modifications and alternative forms, details of which are shown by way of example in the drawings and will be described in detail. However, it should be understood that the intention is not to limit the invention to the specific embodiments described. On the contrary, the invention encompasses all modifications, equivalents, and alternative forms that fall within the spirit and scope of the present disclosure.

[0026] The present disclosure is described with reference to exemplary medical systems that can be used in endoscopic medical procedures. However, it should be noted that this reference to a particular procedure is provided for convenience only and is not intended to limit the present disclosure. Those skilled in the art will recognize that the concepts underlying the disclosed devices and related methods of use can be utilized in medical or any other suitable procedure. The present disclosure can be understood with reference to the following description and the accompanying drawings, and like elements are referred to with the same reference numbers.

[0027] All numerical values are assumed, in this specification, whether explicitly indicated or not, to be modified by the term "about." The term "about" in the context of numerical values generally refers to a range of numbers that a person skilled in the art would consider to be equivalent (e.g., having the same function or result) to the recited value. In many cases, the term "about" may include numbers rounded to the nearest significant digit. Other uses of the term "about" (e.g., in contexts other than numerical values) can be understood from the context of this specification and are assumed to have their ordinary customary definitions consistent with the context of this specification.

[0028] The recitation of numerical ranges 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 dimensions, ranges, and / or values for various components, features, and / or specifications are disclosed, those skilled in the art will understand that the desired dimensions, ranges, and / or values can deviate from those explicitly disclosed.

[0029] As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. As used in this specification and the appended claims, the term "or" is generally used in the sense of "and / or" unless the context clearly indicates otherwise. For ease of understanding, note that certain features of the present disclosure may be described in the singular even if those features may be plural or repeated within the disclosed embodiment(s). Each example of a feature includes, and / or may be encompassed by, a singular disclosure unless expressly stated to the contrary. For brevity and clarity, not all elements of the present disclosure are necessarily shown in each figure or described in detail below. However, it will be understood that the following description may be equally applicable to any and / or all of two or more existing components unless expressly stated to the contrary. Additionally, not all instances of some elements or features are necessarily shown in each figure for clarity.

[0030] Note that references in this specification to "an embodiment," "some embodiments," "other embodiments," etc., indicate that the described embodiment may include a particular feature, structure, or characteristic, but not all embodiments necessarily include that particular feature, structure, or characteristic. Further, such phrases do not necessarily refer to the same embodiment. Moreover, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is contemplated that, whether or not expressly described, bringing that particular feature, structure, or characteristic in connection with other embodiments is within the knowledge of one of ordinary skill in the art, i.e., various individual elements described below are contemplated to be combinable or arrangeable with each other to form additional embodiments, or to complement and / or enhance the described embodiment, as understood by one of ordinary skill in the art, even if not expressly shown in a particular combination.

[0031] For clarity, a particular identification numbering convention (e.g., first, second, third, fourth, etc.) may be used throughout the description and / or claims to name and / or distinguish the various described features and / or features recited in the claims. It is to be understood that the numerical numbering convention is not intended to be limiting and is merely illustrative. In some embodiments, changes to and departures from previously used numbering conventions may be made for the sake of brevity and clarity. That is, a feature identified as a "first" element may later be referred to as a "second" element, a "third" element, etc., or may be completely omitted, and / or a different feature may be referred to as the "first" element. The meaning and / or designation in each instance will be apparent to those skilled in the art.

[0032] The detailed description is intended to be illustrative rather than limiting of the disclosure. 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 disclosure. The detailed description shows exemplary embodiments of the disclosure.

[0033] Referring to FIG. 1, an exemplary endoscope 100 is shown, and FIG. 2 shows an exemplary endoscope system 200. The endoscope 100 may include an elongated tube or shaft 100a configured to be inserted into a subject (e.g., a patient).

[0034] The light source 205 of the endoscope system 200 can supply illumination light to the distal portion 100b of the endoscope 100. The distal portion 100b of the endoscope 100 may house an imaging device (e.g., a CCD or CMOS imaging device) (not shown). The light source 205 (e.g., a lamp) may be located within a video processing unit 210 that processes signals input from the imaging device and outputs the processed video signal to a video monitor (not shown) for observation. The video processing unit 210 can also function as a component of an air / water supply circuit by housing a pressurizing pump 215, such as an air supply pump, within the unit 210.

[0035] The endoscope shaft 100a may include a distal tip 100c (e.g., a distal tip unit) provided at the distal portion 100b of the shaft 100a and a flexible bending portion 105 proximal to the distal tip 100c. The flexible bending portion 105 may include an articulating joint (not shown) to assist in maneuvering the distal tip 100c. On the end face 100d of the distal tip 100c of the endoscope 100, there is a gas / lens cleaning nozzle 220 for supplying gas to insufflate the patient's interior in the treatment area and supplying water to clean the lens covering the imaging device. The cleaning opening 225 on the end face 100d supplies cleaning fluid to the patient's treatment area. 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 passing tools through to the treatment area may 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 located distally of the operation handle 115 (e.g., a proximal handle) of the endoscope 100. A biopsy valve 120 may be utilized to seal the channel opening 110 against the outflow of unwanted fluids.

[0036] The operating handle 115 can be provided with a knob 125 for providing remote four-direction steering of the distal tip via a wire connected to an articulation joint within the bendable flexible portion 105 (for example, one knob controls up-and-down steering and another knob controls left-and-right steering). A plurality of video switches 130 for remotely operating the video processing unit 210 may be arranged on the proximal end side of the handle 115.

[0037] The handle 115 can be provided with two valve positions 135. One of the valve positions 135 can receive a gas / water valve 140 for performing gas injection and lens water supply operations. The gas supply line 240a and the lens cleaning supply line 245a extend distally from the gas / water valve 140 along the shaft 100a and converge at the distal tip 100c proximal to the gas / cleaning nozzle 220 (FIG. 2).

[0038] The other valve position 135 can receive a suction valve 145 for performing a suction operation. The suction supply line 250a can extend distally from the suction valve 145 along the shaft 100a to a junction point that is in fluid communication with the working channel 235 of the endoscope 100.

[0039] The operating handle 115 may be electrically and fluidly connected to the video processing unit 210 via a flexible umbilical 260 and a connector portion 265 extending therebetween. The flexible umbilical 260 has a gas (e.g., air or CO2) supply line 240b, a lens cleaning supply line 245b, a suction supply line 250b, a cleaning supply line 255b, an optical guide (not shown), and an electrical signal cable (not shown). When the connector portion 265 is plugged into the video processing unit 210, it connects the light source 205 within the video processing unit to the optical guide. The optical guide extends along the length of the umbilical 260 and the endoscope shaft 100a and transmits light to the distal tip 100c of the endoscope 100. When the connector portion 265 is plugged into the video processing unit 210, it connects the air pump 215 to the gas supply line 240b within the umbilical 260.

[0040] The 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 umbilical 260. The length of the gas supply tube 240c extends from one end located in the gap 275 between the upper part 280 of the reservoir 270 (e.g., the bottle cap) and the remaining water 285 in the reservoir to the detachable gas / lens cleaning connection 290 outside the connector portion 265. The gas supply line 240b from the umbilical 260 branches at the connector portion 265 and is in fluid communication with the gas supply tube 240c at the detachable gas / lens cleaning connection 290 and also with the air pump 215. The length of the lens cleaning tube 245c, one end of which is located at the bottom of the reservoir 270, can pass through the upper part 280 of the reservoir 270 and reach the same detachable connection 290 as the gas supply tube 240c on the connector portion 265. In other embodiments, the connections may be separate and / or may be separated from each other. The connector portion 265 may also have a detachable cleaning connection 293 for a cleaning supply tube (not shown) that extends from a cleaning water source (not shown) to the cleaning supply line 255b in the umbilical 260. In some embodiments, the cleaning water is supplied via a pump (e.g., a peristaltic pump) from a water source (not shown) independent of the water reservoir 270. In other embodiments, the cleaning supply tube and the lens cleaning tube 245c can supply water from the same reservoir. The connector portion 265 may also include a detachable suction connection 295 for the suction supply lines 250a and 250b that fluidly connect a vacuum source (e.g., hospital suction) (not shown) to the umbilical 260 and the endoscope 100.

[0041] The gas supply line 240b and the lens cleaning supply line 245b are fluidly connected to the valve position 135 of the gas / water valve 140, and the operation of the gas / water valve in the well may be configured to control the supply of gas or lens cleaning to the distal tip 100c of the endoscope 100. The suction supply line 250b is fluidly connected to the valve position 135 for the suction valve 145, and the operation of the suction valve 145 in the well is configured to control the suction applied to the working channel 235 of the endoscope 100.

[0042] The suction valve 145 may be configured to enable or block suction and / or the suction effect within the working channel 235. When the suction valve 145 is in the valve closed position (e.g., the first configuration), the flow of suction fluid through the working channel 235 can be blocked by the suction valve 145. If suction is desired in the working channel 235, the operator or user can actuate the suction valve 145 to move the suction valve 145 to the valve open position (e.g., the second configuration) (e.g., by pressing a button on the valve and / or actuating the suction valve 145 in one or more other suitable ways). When the suction valve 145 is in the valve open position, the flow path inside the suction valve can connect the working channel 235 to a suction device coupled to the suction connection 295, and the suction device can generate a negative pressure for exchanging fluid with the working channel 235 through an outlet provided in the suction valve. When the operator or user releases the suction valve 145, the valve 145 returns to its valve closed position and can reduce or block the flow of suction fluid from the working channel 235.

[0043] In some cases, the suction valve 145 may rely on the path of least resistance to directly draw the flow of suction fluid through the endoscopic system 200. In some cases, when the suction pump is turned on for a procedure, the pump remains on throughout the procedure, continuously drawing air from the flexible umbilical 260 and then drawing fluid from the line side of the endoscope 100 that runs up the umbilical 260 and connects to the port of the suction valve 145. When the suction valve 145 is in the first position and / or configuration (e.g., 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 the second position and / or configuration (e.g., open position) (e.g., when a button or cap associated with the suction valve 145 is pressed and / or actuated in one or more other suitable ways), the opening from the atmosphere through the suction valve 145 to the suction pump is effectively closed or blocked by the suction valve 145, and the fluid path between the working channel 235 through the suction valve 145 and the suction pump can be opened. Thus, the fluid moving to the suction pump can follow the path of least resistance, and the path can vary depending on whether the suction valve 145 is in the first position (e.g., closed position) or the second position (e.g., open position).

[0044] In some cases, the valve stem of the suction valve 145 may be configured to have a close fit with a valve well configured to receive the valve stem in the endoscope 100. In such a suction valve 145, when the valve stem is in the first position, the close fit blocks the flow path between the working channel 235 and the suction pump or increases the resistance to flow and decreases the resistance to flow between the atmosphere and the suction pump. Similarly, when the valve stem is in the second position, the close fit blocks the flow path between the atmosphere and the suction pump or increases the resistance to flow and decreases the resistance to flow between the working channel 235 and the suction pump.

[0045] The suction valve 145 configured to block the flow using a close fit between the valve stem and the valve well requires a precisely manufactured valve stem. The accuracy required to manufacture a suction valve with a close fit requires expensive materials (e.g., metals, etc.), high-precision machinery, and is time-consuming to achieve.

[0046] In addition, the suction valve 145 with a closely fitting valve stem and valve well is manufactured to have at least some clearance to allow the valve stem to adjust its position within the valve well. This clearance can lead to leakage during use, which can lead to two problems that a physician can notice. The first is that even when the suction valve 145 is in the position intended to block the suction from the working channel 235, there is still some suction flow passing through the working channel 235 and the suction valve 145 to reach the suction pump. The smaller the clearance between the valve stem and the valve well, the less unwanted flow through the resulting working channel 235, and the larger the clearance, the more unwanted flow through the working channel 235, but clearance is required to facilitate the movement of the valve stem within the valve well. In such a configuration of the suction valve 235, when the flow is actively going up the working channel 235, even when the suction valve 145 is in the position intended to block the suction flow from the working channel 235, the user may perceive the suction as "insufficient air supply" because the volume is drawn out of the body lumen where the user is working by the suction of the suction pump. Second, when the valve stem of the suction valve 145 is in a position within the valve well to promote the suction flow through the suction valve 145 between the working channel 235 and the suction pump, the flow from the atmosphere to the suction pump may not be completely blocked. Such a leak from the atmosphere can reduce the pressure difference between the suction valve and the distal end of the working channel 235, which can lead to a decrease in the suction force or negative pressure, a decrease in the flow rate, and an inflow of air into the suction pump through the fluid path.

[0047] The aspiration valve 145 configured to operate with a valve stem and valve well that fit snugly may justify manufacturing the aspiration valve 145 with the necessary precision from materials such that the price point of such an aspiration valve can achieve and maintain the desired tolerances over the life of the reusable aspiration valve 145, and thus may function well if intended for reuse in multiple procedures. However, the price point of a single-use aspiration valve may not allow for the use of the necessary materials, tools, and / or precision manufacturing required to achieve and / or maintain tolerances over the life of the single-use aspiration valve.

[0048] The configuration of the aspiration valve for the endoscope 100 and / or other suitable scopes discussed herein addresses the aforementioned concerns regarding existing aspiration valves and is configured to reduce and / or eliminate leakage along unintended flow paths through the aspiration valve 145. FIG. 3 shows a schematic perspective view of an exemplary aspiration valve 145 configured to reduce and / or eliminate leakage along an unintended flow path through the aspiration valve 145.

[0049] The aspiration valve 145 depicted in FIG. 3 includes a cap or button 146, a collar 148, and a body 150, and the body 150 can define an aspiration port 152 and a working channel port 154. The collar 148 can define an opening 156 (e.g., a proximal opening of the valve well 158 as shown in FIGS. 4 and 5 described below) for fluid from the atmosphere (e.g., air) to flow through the aspiration valve 145. Although specific components of the aspiration valve 145 are illustrated and described, other suitable components of the aspiration valve 145 are contemplated, and / or the specifically illustrated and described components of the aspiration valve may be combined to form a single component, and / or separated to form multiple components.

[0050] In some cases, the collar 148 and the body 150 can form, be components of, and / or define a valve well 158 (such as shown in FIGS. 4 and 5 described below). Although the collar 148 and the body 150 are depicted as separate components, the valve well 158 can, if desired, be formed from a single component and incorporate one or more of the features of the collar 148 and the body 150 discussed herein.

[0051] During operation, the suction valve 145 shown in FIG. 3 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 form a fluid path between an aperture 156 that communicates with the atmosphere and the suction port 152. When the suction valve 145 is in the second position, the suction valve 145 is configured to form a fluid path between the working channel port 154 and the suction port 152.

[0052] FIG. 4 shows a schematic cross-sectional view of the suction valve 145 shown in FIG. 3, where the suction valve 145 is in a first position (e.g., a relaxed or closed position). As shown in FIG. 4, the collar 148 can be coupled to the body 150. The collar 148 can be directly or indirectly coupled to the body 150 in any suitable manner via, but not limited to, adhesives, screw connections, luer lock connections, snap connections, ball check connectors, friction fits, and / or additional or alternative coupling techniques. In some cases, the collar 148 can be threaded onto the body 150 and coupled to the body 150 via an intermediate component 151 coupled to the collar 148 via a snap connection, as shown in FIGS. 4 and 5, although this is not essential.

[0053] The body 150 of the valve well 158 shown in FIG. 4 may be configured to receive a valve stem 160 that communicates with the cap 146. For example, the body 150 may define a first lumen 162 (e.g., a suction lumen) that extends to or from the suction port 152, and a second lumen 164 (e.g., a working channel lumen) that extends to or from the working channel port 154, and may define a body opening 166 (e.g., a proximal opening of the body 150) configured to receive the valve stem 160. In some cases, the body opening 166 may be configured to move to the atmosphere through the opening 156 and receive fluid from the atmosphere entering the valve stem 160. In addition to the body opening 166, the valve well 158 may include a distal opening 167 that connects to the suction port 152 through the first lumen 162, and an intermediate opening 169 between the body opening 166 and the distal opening 167 that connects to the working channel port 154 through the second lumen 164. Additionally or alternatively, the valve well 158 may include one or more other suitable openings and / or configurations of openings.

[0054] In some cases, the valve well 158 may 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 a force acting on the valve stem 160. Further, the valve well 158 may have openings to the first lumen 162 and the second lumen 164 as described. In some cases, the valve well 158 may be in fluid communication with and / or define the suction port 152, the first lumen 162, the working channel port 154, the second lumen 164, and the body opening 166, and translation of the valve stem 160 within the valve well 158 may regulate the flow path through the suction valve 145.

[0055] The suction valve 145 can further include one or more biasing mechanisms 168. The biasing mechanism 168 biases the cap 146 to a first position, enables the cap 146 to be adjusted to a second position in response to the force applied to the cap 146, and is configured to return the cap 146 to the first position when the force applied to the cap 146 is completely or at least partially removed from the cap 146. The biasing mechanism 168 can be any suitable type of biasing mechanism. In one example, the biasing mechanism 168 can be a spring as shown in FIG. 4, but this is not essential and other suitable biasing mechanisms are contemplated.

[0056] When the suction valve 145 includes the cap 146 and the 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 if 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 ledge or shoulder 170 of the collar 148, and the collar 148 can at least partially define an opening 156 to the atmosphere. Alternatively or additionally, the biasing mechanism 168 can extend between the cap 146 and one or more other suitable components of the suction valve 145 to facilitate adjustment of the cap 146 relative to the body 150.

[0057] 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 proximal to the first opening 172 can be coupled to the cap 146 via one or more suitable coupling mechanisms. Examples of suitable coupling mechanisms include, but are not limited to, adhesives, screw connections, luer lock connections, snap connections, ball detent connectors, friction fits, and / or additional or alternative coupling mechanisms.

[0058] The valve stem 160 can have any suitable configuration configured to adjust its position within the valve well 158, adjust the 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 lumen 176 that extends between a first opening 172, a second opening 174, and the first opening 172 and the second opening 174. Further, the valve stem 160 can include a portion 178 that extends proximally to the first opening 172 and is configured to couple to the cap 146.

[0059] The first opening 172, the second opening 174, and the lumen 176 can have any suitable configuration configured or designed to facilitate adjusting 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 exemplary configuration, the first opening 172 of the valve stem 160 can be the proximal opening of the valve stem 160. In some cases, the first opening 172 can be a lateral or radial opening in fluid communication with the lumen 176, but this is not essential, and the first opening 172 can be an axial or end opening of the valve stem 160 as desired. Although not essential, the second opening 174 of the valve stem 160 can be the 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, the second opening 174 can be an axial or end opening of the valve stem 160 in fluid communication with the lumen 176 as depicted in FIG. 4, but this is not essential, and the second opening 174 can be a lateral opening as desired.

[0060] The valve stem 160 can include one or more seals 179 configured to translate with the valve stem 160. In one example, as shown in FIG. 4, the valve stem 160 can include a first seal 179a, a second seal 179b, and a third seal 179c. The seals 179 can be configured around the valve stem 160 in any suitable manner to interact with (e.g., contact) one or more inner walls of the valve well 158 to form a barrier to fluid flow. Exemplarily, the first seal 179a can extend circumferentially around the valve stem 160 either wholly or at least partially at a proximal position of the first opening 172 of the valve stem 160, the second seal 179b can extend circumferentially around the valve stem 160 either wholly or at least partially at a distal position of the first opening 172, and the third seal 179c can extend circumferentially around the valve stem 160 either wholly or at least partially at a distal position of the second seal 179b, although other suitable configurations are contemplated.

[0061] The valve stem 160 can be configured to have a greater clearance within the valve well 158 as compared to a conventional valve stem, and particularly as compared to a reusable valve stem. For example, a conventional valve stem can be configured to have a clearance within the valve well of less than about 0.002 inches (about 50.8 μm), such as a clearance of from about 0.002 inches (about 50.8 μm) to about 0.0005 inches (about 12.7 μm), whereas the body of the valve stem 160 of the present disclosure can have a clearance of at least about 0.005 inches (about 127 μm) circumferentially 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 from about 0.005 inches (about 127 μm) to about 0.010 inches (254 μm) from the inner wall of the valve well 158. Forming the valve stem 160 to have a greater clearance within the valve well 158 as compared to a conventional valve configuration allows the aspiration valve 145 to be fabricated using manufacturing techniques of lower precision and / or materials with greater variable tolerances than those conventionally used for aspiration valves of endoscopes. Other suitable clearances and / or dimensions are contemplated.

[0062] The cross-sectional views of FIGS. 4 and 5 illustrate the operation of the aspiration valve 145. As shown in FIG. 4, the valve stem 160 and the aspiration valve 145 are in an exemplary first configuration (e.g., a relaxed or closed position). As shown in FIG. 5, the valve stem 160 and the aspiration valve 145 are in an exemplary second configuration (e.g., an actuated or open position).

[0063] When the valve stem 160 and the suction valve 145 are in the exemplary first configuration, the biasing force of the biasing mechanism 168 (e.g., the force acting in the direction of arrow 180) can bias the valve stem 160 at least partially proximally within the valve well 158 such that the atmosphere opening 156, the body opening 166, and the distal opening 167 are in fluid communication. For example, as shown in FIG. 4, the valve stem 160 can be biased proximally such that the flow path along arrow 182 connects the atmosphere to the suction pressure via the atmosphere opening 156, the body opening 166, the first opening 172 of the valve stem 160, the second opening 174 of the valve stem 160, and the lumen 176 between the first opening 172 and the second opening 174. When the valve stem 160 is in the first configuration, the first seal 179a can engage the collar 148 (when included), can be proximal to the intermediate opening 169 and the body opening 166, the second seal 179b can be distal to the body opening 166, can be proximal to the intermediate opening 169, can contact the inner wall of the valve well 158, the second seal 179b can be a barrier between the body opening 166 and the intermediate opening 169, the third seal 179c can be distal to the intermediate opening 169, 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 the intermediate opening 169 and / or the fluid therein (represented by arrow 184) can be fluidly isolated from the lumen 176 of the valve stem 160, the distal opening 167, and the suction pressure by the arrangement of the second seal 179b, the third seal 179c, and the walls of the valve stem 160.

[0064] When the valve stem 160 and the suction valve 145 are in an exemplary second configuration, a force in the direction of arrow 185 acting on the cap or button 146 (e.g., in a direction opposite or substantially opposite to arrow 180) acts against (e.g., counteracts) the biasing force of the biasing mechanism 168 and adjusts the valve stem 160 at least partially distally within the valve well 158 to adjust the valve stem 160 from a first configuration to a second configuration such that the intermediate opening 159 and the distal opening 167 are in fluid communication. For example, as shown in FIG. 5, the valve stem 160 is adjusted distally such that the flow path along arrow 184 connects fluid from the working channel of the endoscope to the suction pressure via the working channel port 154, the second lumen 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 lumen 176 between the first opening 172 and the second opening 174. When the valve stem 160 is in the second configuration, the first seal 179a may be located proximally of the intermediate opening 169 and distally of the body opening 166, and the first seal 179a may be a barrier between the proximal opening or the opening to the atmosphere 156 and the intermediate opening 169. The third seal 179c may be located distally of the intermediate opening 169 and may be a barrier between the intermediate opening 169 and the distal opening 167. Fluid from the proximal opening 156 and / or the atmosphere through it (represented by arrow 182) may be fluidly isolated from the lumen 176 of the valve stem 160 and the suction pressure by the arrangement of the first seal 179a and the wall of the valve stem 160. In some cases, the valve stem 160 may be configured such that when the valve stem 160 is in the second configuration, the second seal 179b is located distally of the intermediate opening 169 and one or both of the second seal 179b and the third seal 179c are barriers between the intermediate opening 169 and the distal opening 167, but this is not essential.

[0065] FIG. 6 shows a perspective view of an exemplary valve stem body 186 (e.g., the body of valve stem 160 without seal 179 thereon). 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 lumen 176 extending between the first opening 172 and the second opening 174. Additionally or alternatively, the valve stem body 186 may define one or more recesses 188. As shown in FIG. 6, the valve stem body 186 can define a first recess 188a, a second recess 188b, and a third recess 188c. Optionally, the first recess 188a may be associated with at least a portion of the first seal 179a and / or may be configured to receive at least a portion of the first seal 179a, may be located proximal to the first opening 172, the second recess 188b may be associated with at least a portion of the second seal 179b and / or may be configured to receive at least a portion of the second seal 179b, may be located distal to the first opening 172, and the third recess 188c may be associated with at least a portion of the third seal 179c and / or may be configured to receive at least a portion of the third seal 179c, and may be located distal to the second recess 188b.

[0066] In some cases, the valve stem body 186 may include one or more recesses 190 (e.g., channels or runners) extending between a plurality of recesses 188 configured to receive the seal 179, as discussed in more detail below. In one example, a first elongated or longitudinally extending recess 190a may extend between a first recess 188a and a second recess 188b, and a second elongated or longitudinally extending recess 190b may extend between the second recess 188b and a third recess 188c. The first elongated recess 190a and the second recess 190b are shown aligned in FIG. 6, but this is not essential, and the elongated recesses 190a, 190b may be offset from each other. Further, although two elongated recesses 190a, 190b are shown in FIG. 6, other suitable numbers of recesses 190 connecting the recesses 188 configured to receive the seal 179 are contemplated.

[0067] The proximal portion 178 of the valve stem 160 and the valve stem body 186 can take any suitable configuration. In one example, as shown in FIGS. 4 and 5, the proximal portion 178 may be elongated and may have a consistent cross-sectional diameter along its length. In another example, the proximal portion 178 may have a varying diameter along its length to facilitate the receipt and / or connection of the cap or button 146 and / or for one or more other suitable purposes.

[0068] The valve stem body 186 can be formed in any suitable manner. In some cases, although not essential, the valve stem 160 can be formed using a molding process, an injection molding process, a casting process, a finishing process, sanding, and / or one or more additional or alternative manufacturing techniques, or using them. In one exemplary example, the valve stem body 186 can be formed using an injection molding process.

[0069] FIG. 7 shows a perspective view of valve stem 160, where seal 179 is formed in and / or to cover recess 188 shown in FIG. 6, and is configured to span the clearance between valve stem body 186 and the inner wall of valve well 158 so as to form a barrier that prevents fluid from crossing seal 179. Seal 179 can be applied to valve stem body 186 in any suitable manner. In one example, seal 179 may be overmolded onto valve stem body 186 (e.g., within recess 188) by a suitable process such as an injection molding process. Alternatively or additionally, seal 179 may be wound around valve stem body 186 and inserted into recess 188. Other suitable techniques including, but not limited to, coextrusion are contemplated for forming valve stem body 186 and seal 179 of valve stem 160.

[0070] Recess 190 can facilitate overmolding of seal 179 within recess 188. For example, in an overmolding process, the material used for seal 179 is applied to circumferentially extending recess 188 through one or more of elongate recesses 190 that join circumferentially extending recess 188, thereby forming one or more lengths of material 192 (e.g., first length of material 192a and second length of material 192b as depicted in FIG. 7) that connect each of seals 179 to adjacent seals 179. Exemplary recesses 188, 190 can facilitate application of the material forming seal 179 to valve stem body 186 at a single gate or injection point that is not located on seal 179. Utilizing a gate or injection point for applying the material of seal 179 to valve stem body 186 at a location spaced from seal 179 (e.g., along recess 190), if any, can facilitate post-treatment of the gate by isolating the post-treatment of the material for smoothing the gate to a location spaced from seal 179. For example, there may be a slight depression or nipple of material at the gate after injection, which is undesirable if located on the seal.

[0071] The valve stem body 186 and the seal 179 can be formed from any suitable material. In some cases, the valve stem body 186 may be formed from a first material and the seal 179 may be formed from a second material, and the second material may be the same as or different from the first material. The valve stem body 186 may be formed from a rigid or stiff polymer, and the seal 179 may be formed from a flexible polymer, although this is not essential. In one example, the valve stem body 186 can be formed from one or more of metal, polymer, acrylonitrile butadiene styrene (ABS), polycarbonate, and / or other suitable materials. In another example, the seal 179 can be formed from one or more of polymer, thermoplastic elastomer (TPE), thermoplastic polyurethane (TPU), liquid silicone rubber (LSR), and / or other suitable materials.

[0072] The material of the seal 179 can have any suitable durometer. In one example, the material of the seal 179, when formed on the valve stem body 186, can have other suitable values of durometer in the range of about 20 to 80 Shore A, about 30 to 60 Shore A, and / or one or more other suitable ranges, but can be made softer or harder depending on the geometry used for the seal and the desired amount of interference with the valve well 158. In one example, the seal 179 can be formed from silicone with a durometer in the range of 40 to 50 Shore A, although this is not essential.

[0073] Seal 179 can have any suitable shape configured to form a barrier against fluid 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 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 disk-shaped ring, a pre-configured seal applied to the circumferentially extending recess 188, and / or other suitable shapes and / or configurations of seal 179.

[0074] As depicted in FIG. 8, the distal end of valve stem 160 includes a seal 179 that is a protruding disk configured to wipe along the inner surface of valve well 158 as valve stem 160 translates within valve well 158. Nevertheless, the geometry of the seal can be wider or narrower than seal 179 depicted in FIG. 8 with respect to the width or diameter of valve stem body 186 and / or recess 188, depending on the material selected to form seal 179, in order to achieve a desired frictional force in the interference with valve well 158. In some cases, the geometry and / or material of seal 179 can be configured to minimize the normal force on the wall of valve well 158 while allowing seal 179 to maintain a fluid barrier between valve stem body 186 and the inner wall of valve well 158, although this is not essential.

[0075] FIG. 9 shows a method 300 for forming a valve stem (e.g., valve stem 160 and / or other suitable valve stem) for an endoscope (e.g., an endoscope and / or other suitable endoscope). The method can include forming the body of the valve stem (e.g., valve stem body 188 and / or other suitable body of the valve stem) 302 and forming one or more seals (e.g., seal 179 and / or other suitable seals) around the body 304. Once the valve stem is formed, the valve stem can be inserted into a valve well, coupled to a cap or button, and form a suction valve (e.g., suction valve 145 and / or other suitable suction valve).

[0076] In some cases, forming the body of the valve stem 302 can include forming the body from a first material. Further, the body can include one or more circumferential recesses (e.g., recess 188 and / or other suitable recesses) configured to receive the seals. In one example, forming the body of the valve stem 302 can include forming a first circumferential recess in the body of the valve stem, forming a second circumferential recess in the body of the valve stem, and forming a third circumferential recess in the body of the valve stem. The recesses can be formed in a single forming step (e.g., using injection molding and / or other suitable manufacturing techniques) and / or individually, as desired.

[0077] In some cases, the recesses can be connected by one or more longitudinally extending recesses (e.g., elongate recess 190 and / or other suitable recesses) configured to couple the circumferential recesses to each other. In one example, a first longitudinally extending recess can be formed between the first circumferential recess and the second circumferential recess, and a second longitudinally extending recess can be formed between the second circumferential recess and the third circumferential recess.

[0078] Further, forming the body of the valve stem 302 may include forming a first opening (e.g., a lateral or radial opening and / or other suitable opening), a second opening (e.g., an end or terminal opening and / or other suitable opening), and a lumen extending between the first opening and the second opening. When the first and second openings are included in the valve stem body, 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.

[0079] Forming a seal around the body 304 may include forming a seal in each circumferential recess of the body. In one example, a first seal may be formed in the first circumferential recess, a second seal may be formed in the second circumferential recess, and a third seal may be formed in the third circumferential recess. In some cases, a first seal is formed in the first circumferential recess, a second seal is formed in the second circumferential recess, a third seal is formed in the third circumferential recess, a first length of material connecting the first seal to the second seal is formed in the first longitudinal recess, and a second length of material connecting the second seal to the third seal is formed in the second longitudinal recess, whereby the seal may be formed around the body. Further, forming the seal 304 may include forming the seal from a second material different from the first material, although this is not essential. In some cases, the second material may be overmolded onto the first material, although this is not essential. Alternatively or additionally, the seal may be pre-formed (e.g., as an O-ring and / or other suitable pre-formed configuration) and formed around the body by applying the pre-formed seal to a desired position along the body.

[0080] In some cases, forming a seal around the body may include forming the seal while forming the body. In one example, the body and seal of the valve stem may be co-extruded using one or more materials. In another example, the valve stem may be monolithic such that the body and seal are formed from a single material using molding and / or machining techniques.

[0081] It should be understood that the present disclosure is merely exemplary in many respects. Without departing from the scope of the present disclosure, changes may be made in details, particularly with regard to the shape, size, and arrangement of steps. This can include, within appropriate limits, the use of any of the features of one exemplary embodiment used in other embodiments. The scope of the invention is, of course, defined by the language in which the appended claims are expressed.

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 located 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 lumen 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; a third seal extending circumferentially around the valve stem at a position distal to the second seal; wherein the valve stem has a first configuration in which, within the valve well, 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 lumen is fluidly isolated from the intermediate opening; and the valve stem has a second configuration in which, within the valve well, the first seal is proximal to the intermediate opening, the lumen is fluidly isolated from the proximal opening, and the first seal is a barrier between the proximal opening and the intermediate opening.

2. The suction valve assembly according to 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 lumen of the valve stem.

3. The suction valve assembly according to claim 1 or 2, wherein when the valve stem is in the second configuration, the intermediate opening and the distal opening are in fluid communication through the lumen 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 distal to the intermediate opening and the distal opening is fluidly 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 the inner wall of the valve well when the valve stem is in the first configuration.

6. ​ ​ The first opening is a radially-opening portion of the valve stem, and the second opening is an axially-opening portion of the valve stem. The suction valve assembly according to any one of claims 1 to 5.

7. The valve well a body defining the intermediate opening and the distal opening, and a collar connectable to the body further includes, and the collar defines the proximal opening, The first seal is configured to engage the collar when the valve stem is in the first configuration. The suction valve assembly according to any one of claims 1 to 6.

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

9. The valve stem a first circumferential recess in which the first seal is located, a second circumferential recess in which the second seal is located, and a longitudinal recess extending between the first circumferential recess and the second circumferential recess The suction valve assembly according to any one of claims 1 to 8.

10. The valve stem a first circumferential recess in which the first seal is located, a second circumferential recess in which the second seal is located, a third circumferential recess in which the second seal is located, a first longitudinal recess extending between the first circumferential recess and the second circumferential recess, and a second longitudinal recess extending between the second circumferential recess and the third circumferential recess including, The material forming one or more of the first seal, the second seal, and the third seal extends into one or both of the first longitudinal recess and the second longitudinal recess. The suction valve assembly according to any one of claims 1 to 9.

11. A suction valve assembly for use with an endoscope having a lumen configured to extend into a patient's body cavity, A valve well defining a port configured to be in fluid communication with the lumen; A valve stem configured to be adjusted within the valve well; The valve stem includes a first circumferential seal, a second circumferential seal, a third circumferential seal, a first connection component extending between the first circumferential seal and the second circumferential seal, and a second connection component extending between the second circumferential seal and the third circumferential seal; When the valve stem is in a first configuration within the valve well, it is configured to fluidly isolate the port from negative pressure; When the valve stem is in a second configuration within the valve well, it is configured to fluidly couple the port to the negative pressure and fluidly isolate the port from the atmosphere. A suction valve assembly.

12. The valve stem further includes a first opening, a second opening, and a lumen extending between the first opening and the second opening; The first circumferential seal is proximal to the first opening; The suction valve assembly according to claim 11, wherein the second circumferential seal and the third circumferential seal are distal to the first opening.

13. The valve stem; A first circumferential recess in which the first circumferential seal is located; A second circumferential recess in which the second circumferential seal is located; A third circumferential recess in which the third circumferential seal is located; A first longitudinal recess in which the first connection component is located; A second longitudinal recess in which the second connection component is located; Further comprising; The suction valve assembly according to claim 11 or 12, wherein the first circumferential seal, the second circumferential seal, the third circumferential seal, the first connection component, and the second connection component are of an integral material.

14. A medical device comprising; A proximal endoscope handle; A distal tip unit adapted to be inserted into a patient's body cavity; An elongated tube extending between the proximal endoscope handle and the distal tip unit; A suction valve in communication with the lumen of the elongated tube and configured to fluidly couple the lumen to negative pressure in an adjustable manner; Comprising, the suction valve; A valve well; A valve stem configured to be adjusted within the valve well, the valve stem including a first circumferential seal, a second circumferential seal, and a third circumferential seal, and comprising when the valve stem is in a first configuration within the valve well, the valve stem is configured to fluidly isolate the lumen from the negative pressure, when the valve stem is in a second configuration within the valve well, the valve stem is configured to fluidly couple the lumen to the negative pressure and fluidly isolate the lumen from the atmosphere, a medical device. **Claim 15** The valve stem a radial opening, an axial opening, and a valve stem lumen fluidly coupling the radial opening and the axial opening comprising when the valve stem is in the first configuration, the radial opening is in fluid communication with the atmosphere and the negative pressure, when the valve stem is in the second configuration, the radial opening is in fluid communication with the negative pressure and is fluidly isolated from the atmosphere, the medical device according to claim 14.

Images