Devices, assemblies, and methods for delivering agents

A device for delivering an agent, comprising:

• a pressurized fluid source configured to store a pressurized fluid;
• an enclosure configured to store the agent, the enclosure including an inlet region in fluid communication with the agent and an outlet region having a porous funnel that is in fluid communication with the pressurized fluid source;
• and
• a valving assembly disposed within the enclosure, the valving assembly including a piston having a chamber disposed along a sidewall of the piston, wherein the piston is configured to move between a first position and a second position relative to the enclosure to selectively guide the agent from the inlet region to the outlet region;
• wherein, in the first position, the chamber is positioned within the inlet region such that the piston is configured to receive the agent in the chamber;
• and
• wherein, in the second position, the chamber is positioned within the outlet region such that the piston is configured to release the agent from the chamber to mix with the pressurized fluid received from the pressurized fluid source and passing through the porous funnel.

A method of delivering an agent from a medical device, the method comprising:

• moving a piston to a first region of an enclosure of the medical device, the first region is in fluid communication with a source of the agent such that a chamber disposed on a sidewall of the piston receives a volume of the agent when the piston is in the first region;
• moving the piston to a second region of the enclosure, thereby releasing the volume of the agent received in the chamber into the second region, wherein the second region is in fluid communication with a source of fluid and the enclosure includes a porous funnel within the second region;
• releasing fluid into the second region from the source of fluid through the porous funnel, thereby mixing the volume of the agent with the fluid within the second region;
• and
• delivering a mixture of the volume of the agent and the fluid from the second region through an outlet of the medical device that is in fluid communication with the second region.