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An adapter assembly including a manifold and a valve assembly. The valve assembly includes a seat and a valve body having a circular base and a wall. The wall extends from a trailing side of the base to form a dome-like shape terminating at an end at which a slit is formed, with the wall defining op

An adapter assembly including a manifold and a valve assembly. The valve assembly includes a seat and a valve body having a circular base and a wall. The wall extends from a trailing side of the base to form a dome-like shape terminating at an end at which a slit is formed, with the wall defining opposing sealing edges at the slit. The seat has an upper circumferential surface and a lower circumferential surface. The upper surface engages a leading side of the base, whereas the lower surface engages a trailing side. At least one of the upper and lower surfaces forms a segment of increased height. Upon final assembly, the valve body is disposed across a passageway of the manifold, with the slit providing a selectively openable path. A force imparted by the segment of increased height flexes the base and biases the sealing edges into engagement.

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1. A method of connecting a respiratory device to an artificial airway, the method comprising: providing a valve seat in an access port of a manifold, the valve seat having an upper circumferential surface and a lower circumferential surface;retaining a valve assembly via the valve seat, the valve a

1. A method of connecting a respiratory device to an artificial airway, the method comprising: providing a valve seat in an access port of a manifold, the valve seat having an upper circumferential surface and a lower circumferential surface;retaining a valve assembly via the valve seat, the valve assembly including: a base with a substantially planar upper surface contacting the upper circumferential surface of the valve seat and a lower surface contacting the lower circumferential surface of the valve seat and a wall extending from the base with a slit that is formed through the wall with opposing sealing edges, wherein two circumferentially discontinuous portions are on the upper surface at opposing sides of the slit, each forming a segment of increased height from the planar upper surface, the circumferentially discontinuous portions contacting the upper circumferential surface of the valve seat and forcing the opposing sealing edges into engagement;connecting the manifold within a breathing circuit that fluidly connects a respiratory device to an artificial airway. 2. The method of claim 1, wherein the segment of increased height is positioned perpendicular to a plane of the slit. 3. The method of claim 1, wherein a first portion of the wall extends from the base and a second portion of the wall extends from the first portion to the slit, and further wherein a thickness of the wall in a region of the slit is greater than a thickness of the wall along the first portion. 4. The method of claim 1, further comprising: inserting a distal end of a medical instrument into the access port; andadvancing the distal end through the slit and toward a respiratory port of the manifold;wherein the sealing edges of the slit separate about the distal end. 5. The method of claim 4, further comprising withdrawing the distal end from the valve body; wherein upon withdrawal of the distal end from the slit, the valve body returns to a sealed state in which the opposing edges seal against one another. 6. The method of claim 5, wherein segment of increased height of the valve seat structure imparts a force onto the base that forces the valve body to return to the sealed state. 7. The method of claim 1 wherein the lower circumferential surface of the valve seat comprises a rib having circumferentially spaced, first and second raised segments, the first and second raised segments causing the base to more overtly flex at regions in contact with the raised segments. 8. The method of claim 7, wherein the upper circumferential surface of the valve seat comprises a shoulder having circumferentially spaced, first and second raised segments, the first and second raised segments causing the base to more overtly flex at regions in contact with the raised segments. 9. The method of claim 8, wherein upon assembly, the raised segments of the lower circumferential surface are longitudinally aligned with respective ones of the raised segments of the upper circumferential surface. 10. A method of connecting a respiratory device to an artificial airway, the method comprising: fluidly connecting a ventilator port of an adapter assembly to a ventilating device;fluidly connecting a respiratory port of the adapter assembly to the artificial airway;establishing a fluid connection between the ventilating device and the artificial airway via the adapter assembly;connecting a catheter assembly to an access port of the adapter assembly, wherein the adapter assembly includes a manifold, the manifold comprising a valve assembly having a base with a substantially planar upper surface contacting the upper circumferential surface of the valve seat and a lower surface contacting the lower circumferential surface of the valve seat and a wall extending from the base with a slit that is formed through the wall with opposing sealing edges,wherein two circumferentially discontinuous portions are on the upper surface at opposing sides of the slit, each forming a segment of increased height from the planar upper surface, the circumferentially discontinuous portions contacting the upper circumferential surface of the valve seat and forcing the opposing sealing edges into engagement. 11. The method of claim 10, wherein the segment of increased height is positioned perpendicular to a plane of the slit. 12. The method of claim 10, wherein a first portion of the wall extends from the base and a second portion of the wall extends from the first portion to the slit, and further wherein a thickness of the wall in a region of the slit is greater than a thickness of the wall along the first portion. 13. The method of claim 10, further comprising: inserting a distal end of a medical instrument into the access port; andadvancing the distal end through the slit and toward a respiratory port;wherein the sealing edges of the slit separate about the distal end. 14. The method of claim 13, further comprising withdrawing the distal end from the valve body; wherein upon withdrawal of the distal end from the slit, the valve body returns to a sealed state in which the opposing edges seal against one another. 15. The method of claim 14, wherein the segment of increased height of the valve seat structure imparts a force onto the base that forces the valve body to return to the sealed state. 16. The method of claim 10, wherein the lower circumferential surface of the valve seat comprises a rib having circumferentially spaced, first and second raised segments, the first and second raised segments causing the base to more overtly flex at regions in contact with the raised segments. 17. The method of claim 16, wherein the upper circumferential surface of the valve seat comprises a shoulder having circumferentially spaced, first and second raised segments, the first and second raised segments causing the base to more overtly flex at regions in contact with the raised segments. 18. The method of claim 17, wherein upon assembly, the raised segments of the lower circumferential surface are longitudinally aligned with respective ones of the raised segments of the upper circumferential surface.