CN-122006054-A - Medical tube and method of manufacture

Abstract

The present invention relates to medical tubes and methods of manufacture. A medical tube includes an elongate catheter having a first opening, a second opening, a longitudinal axis, a lumen extending along the longitudinal axis between the first opening and the second opening, and a corrugated wall formed of extruded material extending between the first opening and the second opening and surrounding the lumen. The wall is stiffer in a first length of the conduit adjacent the first opening than in a second length of the conduit adjacent the second opening. The variable hardness of the tube wall may improve the heat distribution of the tube and improve the reflux of condensate into the humidifier that provides humidified gas to the tube.

Inventors

• PK Graham Sodd method of investing
• E.A. Garcia
• DJ SIMS

Assignees

• 费雪派克医疗保健有限公司

Dates

Publication Date

20260512

Application Date

20121012

Priority Date

20111014

Claims (1)

1. 1. A medical tube for providing humidified gas to a patient, comprising: An elongated conduit having a first opening as a humidified gas inlet for receiving humidified gas, a second opening as a humidified gas outlet for exhausting humidified gas, a longitudinal axis, a lumen extending along the longitudinal axis between the first opening and the second opening, and a conduit wall formed of extruded material extending between the first opening and the second opening and surrounding the lumen, Wherein the conduit wall is stiffer adjacent the first opening than adjacent the second opening.

Description

Medical tube and method of manufacture The present application is a divisional application of patent application 202210728125.0 entitled "medical tube and manufacturing method" filed on 24 th month 6 of 2022. Technical Field The present disclosure relates generally to tubing suitable for medical use, and in particular to tubing for use in medical circuits suitable for providing gas to and/or removing gas from a patient, such as in Positive Airway Pressure (PAP), respirators, anesthesia, ventilators, and insufflation systems. Background In a medical circuit, various components deliver warm, humidified gases to a patient. For example, in some breathing circuits, such as PAP or assisted breathing circuits, gases inhaled by a patient are delivered from a heater-humidifier through an inhalation tube. As another example, a tube may deliver humidified gas (typically CO 2) into the abdominal cavity in the insufflation circuit. This may help prevent "dehydration" of the patient's internal organs and may reduce the amount of time required for post-operative recovery. In these medical applications, the gases are preferably delivered under conditions having a humidity close to saturation level and at a temperature close to body temperature (typically at a temperature between 33 ℃ and 37 ℃). Condensation or "rain" may form on the interior surfaces of the breathing tube as the high humidity breathing gas cools and/or comes into contact with the relatively cooler breathing tube surfaces. There remains a need for tubing that isolates heat losses and enables improved temperature and/or humidity control in medical circuits, for example. It is therefore an object of the present invention to provide a medical tube and/or a method of manufacturing a medical tube which will at least to some extent solve the aforementioned problems or which will at least provide the industry or the public or both with a useful choice. In this specification, where reference has been made to patent specifications, other external documents, or other sources of information, this is generally for the purpose of providing a context for discussing the features of the invention. Unless specifically stated otherwise, reference to such external documents is not to be construed as an admission that such documents, or sources of such information, are prior art, or form part of the common general knowledge in the art, in any jurisdiction. Other aspects and advantages of the present invention will become apparent from the following description, given by way of example only. Disclosure of Invention Medical tubes and breathing tubes, and methods of manufacturing such tubes, are disclosed herein in various embodiments. In at least one embodiment, a medical tube for providing humidified gas to a patient can include an elongate conduit having a first opening sized and shaped for connection to a source of humidified gas, a second opening sized and shaped for connection to a patient interface, a longitudinal axis, a lumen extending along the longitudinal axis between the first opening and the second opening, and a wall formed of extruded material extending between the first opening and the second opening and surrounding the lumen. The wall is stiffer in a first region of the conduit adjacent the first opening than in a second region of the conduit adjacent the second opening. In at least one embodiment, the heated breathing tube may include a single corrugated extruded conduit including a proximal patient end and a distal chamber end, and one or more heating elements on or in the conduit, wherein the conduit has a first region having a first stiffness at the chamber end and a second region having a second stiffness at the patient end, and the first stiffness is greater than the second stiffness. In various embodiments, in the foregoing medical tube and/or heated breathing tube, the first region is configured to extend vertically from a humidified gas source. The vertical extension may define a reflow length. For example, the reflow length may be between about 350mm and about 400 mm. In various embodiments, the foregoing medical tube and/or heated breathing tube have one, some, or all of the following characteristics, as well as those described elsewhere in this disclosure. The medical or breathing tube may further include one or more conductive filaments in or on the catheter. At least one of the one or more conductive filaments may be a heating filament. At least one of the one or more conductive filaments may be a sense line. The conduit may be generally cylindrical. The wall may be corrugated. The extruded material may be foam. The foam may be a polymer foam. The foam may be a closed cell foam. The extruded material may include one or more surface modifying agents. The walls may have an average contact angle of less than 50 degrees (or about 50 degrees). The thickness of the wall in the first region may be between 0.5mm and 2.0mm (or about 0.5mm and about 2.0 mm).