# US 2016/0250412 A1 · Drip chamber with hydrophobic interior surface > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2016/0250412 A1 - Document ID: US20160250412A1 - Status: Published application - Kind: A1 - Application number: 15/154,048 - Filed: 2016-05-13 - Published: 2016-09-01 - Earliest claimed: 2013-03-14 - Assignees: Baxter Healthcare S.A.; Baxter International Inc. - Applicants: Baxter Healthcare SA; Baxter International Inc. - Inventors: James F. Munro; Tuan Bui - Web page: https://patentgrep.com/patent/US20160250412A1 ## CPC - A61M 5/1689: {Drip counters} - A61M 5/1411: {Drip chambers (A61M5/1689, A61M5/40 take precedence)} - A61M 2205/3306: Optical measuring means - A61M 2207/00: Methods of manufacture, assembly or production - Y10T 29/49826: Assembling or joining - A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)} - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A drip chamber for an infusion tube, including: a first end including a drip tube; a second end including an exit port; and a wall connecting the first and second ends and including an interior surface with a hydrophobic portion. The drip chamber includes a space enclosed by the interior wall and the first and second ends. The hydrophobic portion of the interior surface repels liquid contacting the hydrophobic coating. The hydrophobic portion of the interior surface enables light to refract through the hydrophobic portion and the wall in the same manner as is the case when the hydrophobic portion is not present on the interior surface. ## Claims ### Claim 1 A method of fabricating a drip chamber for an infusion tube, comprising: forming a first end including a drip tube; forming a second end including an exit port; forming a wall connecting the first and second ends and including an interior surface with a hydrophobic portion; and, enclosing a space with the interior surface and the first and second ends, wherein: the hydrophobic portion of the interior surface repels liquid contacting the hydrophobic coating; and, the hydrophobic portion of the interior surface enables light to refract through the hydrophobic portion and the wall in the same manner as is the case when the hydrophobic portion is not present on the interior surface. ### Claim 2 (depends on 1) The method of claim 1, wherein the hydrophobic portion of the interior surface enables direct mapping of the light passing through the hydrophobic portion of the interior surface from a point within the drip chamber to a point on an image of the point in the drip chamber. ### Claim 3 (depends on 1) The method of claim 1, wherein the hydrophobic portion of the interior surface is aligned with the end of the drip tube in a direction orthogonal to a longitudinal axis for the drip chamber passing through the first and second ends of the drip chamber. ### Claim 4 An optical imaging system for an infusion tube, comprising: a drip chamber including: a first portion with a drip tube; a second portion with an exit port; a third portion located between the first and second portions; and, a wall: connecting the first and second ends; and, including an interior surface with a hydrophobic portion aligned with at least one of the first or third portions in a direction orthogonal to a longitudinal axis for the drip chamber passing through the first and second ends; at least one light source for emitting light; an optics system including: at least one lens for receiving and transmitting the light transmitted through the hydrophobic portion of the interior surface and the at least one of the first or third portions; and, an image sensor for: receiving the transmitted light from the at least one lens; and, generating and transmitting data characterizing the transmitted light from the at least one lens; a memory element configured to store computer readable instructions; and, at least one specially programmed processor configured to execute the computer readable instructions to generate, using the data, at least one image of the at least one of the first or third portions, wherein: the hydrophobic portion of the interior surface repels liquid contacting the hydrophobic portion of the interior surface; and, the hydrophobic portion of the interior surface enables the light to pass through the hydrophobic portion of the interior surface without scattering. ### Claim 5 (depends on 4) The optical imaging system of claim 4, wherein the hydrophobic portion of the interior surface enables direct mapping of the light from respective points within the first or third portions to respective points on the at least one image. ### Claim 6 A method of imaging an infusion tube having a drip chamber including a first portion with a drip tube, a second portion with an exit port, a third portion located between the first and second portions, and a wall connecting the first and second ends and including an interior surface with a hydrophobic portion aligned with at least one of the first or third portions in a direction orthogonal to a longitudinal axis for the drip chamber passing through the first and second ends, comprising: repelling liquid contacting the hydrophobic portion of the interior surface; emitting, using at least at least one light source, light; transmitting the light through the hydrophobic portion of the interior surface and at least one of the first or third portions without scattering the light; receiving, using at least one lens, the light transmitted through the hydrophobic portion of the interior surface and the at least one of the first or third portions; transmitting, through the at least one lens, the light transmitted through the hydrophobic portion of the interior surface and the at least one of the first or third portions; receiving, using an image sensor, the transmitted light from the at least one lens; generating and transmitting, using the image sensor, data characterizing the transmitted light from the at least one lens; storing computer readable instructions in a memory element; and, executing the computer readable instructions, using at least one specially programmed processor and the data, to generate at least one image of the at least one of the first or third portions. ### Claim 7 (depends on 6) The method of claim 6, further comprising: directly mapping, using the at least one specially programmed processor, the light from respective points within the at least one of the first or third portions to respective points on the at least one image.