Abstract: In some examples, a catheter includes an expandable member configured to expand radially outward from a collapsed configuration to an expanded configuration. The expandable member is configured to be expanded and contracted in a controlled manner, e.g., in response to user actuation or automatically under the control of control circuitry of a device. For example, in some examples, control circuitry of a device can be configured to control the expandable member to expand and contract according to a predetermined expansion frequency or according to an expansion frequency determined based on a cardiac cycle of a patient.

Abstract: In some examples, a catheter includes an elongated body that includes a proximal portion and a distal portion, and one or more electroactive elements in at least one of the proximal portion or the distal portion of the elongated body. The one or more electroactive elements each include a contractive material configured contract in response to an application of an electrical signal to the respective electroactive element. The contraction of the electroactive elements is configured to change a dimension or a shape of the elongated body. The electroactive elements may be distributed around the elongated body at the distal portion of the elongated body, such as in different axial or radial positions. The electroactive elements may comprise a nickel titanium (NiTi) alloy having a Ni:Ti composition of about 50:50.

Abstract: In some examples, a catheter includes a catheter body including an outer jacket and an inner liner. The inner liner may include a proximal section including a proximal end of the inner liner and a distal section including a distal end of the inner liner. The distal section may include an inner liner defining a plurality of cuts. Each cut may extend at least partially through the liner wall. The one or more cuts defined in the liner wall of the distal section of the inner liner may increase a bending flexibility of the distal section relative to the proximal section of the inner liner, while maintaining a suitable tensile strength of the distal section.

Abstract: In some examples, a catheter includes an elongated body comprising proximal and distal portions. The distal portion of the elongated body comprises an inner liner that includes a proximal liner section and a distal liner section that include different materials, and an outer jacket positioned over the inner liner. The distal liner section has a first hardness and the proximal liner section has a second hardness, where the first hardness is less than the second hardness.

Abstract: Example compliant hydrophilic coatings including a base coat and a lubricious top coat for coating a medical device including a flexible substrate. The coatings exhibit reduced cracking and peeling in response to deformation or expansion of the flexible substrate. Example techniques for coating a medical device including a flexible substrate with compliant hydrophilic coatings.

Abstract: In some examples, a catheter includes an elongated body and an expandable member at a distal portion of the elongated body and defining at least part of a distal tip of the catheter. The expandable member is formed from materials that enable a distal tip of the catheter to be radiopaque without the addition of a separate radiopaque marker (e.g., a solid metal ring of radiopaque material separate from and connected to the elongated body) at the distal tip of the catheter.

Abstract: In some examples, a catheter includes a structural support member including bamboo. For example, a catheter may include a bamboo coil and/or a bamboo braided member positioned between an inner liner and an outer jacket. The structural support member comprising bamboo may be configured to be biodegradable.

Abstract: In some examples, a catheter includes an elongated body comprising proximal and distal portions. The distal portion of the elongated body comprises an inner liner that includes a proximal liner section and a distal liner section that include different materials, and an outer jacket positioned over the inner liner. The distal liner section has a first hardness and the proximal liner section has a second hardness, where the first hardness is less than the second hardness.

Abstract: In some examples, a catheter includes an elongated body comprising proximal and distal portions. The distal portion of the elongated body comprises an inner liner that includes a proximal liner section and a distal liner section that include different materials, and an outer jacket positioned over the inner liner. The distal liner section has a first hardness and the proximal liner section has a second hardness, where the first hardness is less than the second hardness.

Abstract: Example compliant hydrophilic coatings including a base coat and a lubricious top coat for coating a medical device including a flexible substrate. The coatings exhibit reduced cracking and peeling in response to deformation or expansion of the flexible substrate. Example techniques for coating a medical device including a flexible substrate with compliant hydrophilic coatings.

Abstract: In some examples, a catheter includes an elongated body that includes a proximal portion and a distal portion, and one or more electroactive elements in at least one of the proximal portion or the distal portion of the elongated body. The one or more electroactive elements each include a contractive material configured contract in response to an application of an electrical signal to the respective electroactive element. The contraction of the electroactive elements is configured to change a dimension or a shape of the elongated body. The electroactive elements may be distributed around the elongated body at the distal portion of the elongated body, such as in different axial or radial positions. The electroactive elements may comprise a nickel titanium (NiTi) alloy having a Ni:Ti composition of about 50:50.

Abstract: In some examples, a catheter body includes an outer jacket positioned over a structural support member. A proximal portion of the structural support member comprises a straight or tapered polymer hypotube and a distal portion of the structural support member comprises a distal support member that is more flexible than the polymer hypotube. In some examples, the polymer hypotube defines one or more openings, through which an adhesive may be introduced between the polymer hypotube and an inner liner of the catheter body.

Abstract: Example compliant hydrophilic coatings including a base coat and a lubricious top coat for coating a medical device including a flexible substrate. The coatings exhibit reduced cracking and peeling in response to deformation or expansion of the flexible substrate. Example techniques for coating a medical device including a flexible substrate with compliant hydrophilic coatings.

Abstract: In some examples, a catheter includes a catheter body including an outer jacket and an inner liner. The inner liner may include a proximal section including a proximal end of the inner liner and a distal section including a distal end of the inner liner. The distal section may include an inner liner defining a plurality of cuts. Each cut may extend at least partially through the liner wall. The one or more cuts defined in the liner wall of the distal section of the inner liner may increase a bending flexibility of the distal section relative to the proximal section of the inner liner, while maintaining a suitable tensile strength of the distal section.

Abstract: In some examples, a catheter may include a catheter body, a first expandable member, and a second expandable member. The catheter body may define a first lumen, a second lumen, a delivery port, and a surface extending from the delivery port into the first lumen. The first lumen may define a first central longitudinal axis. The second lumen may define a second central longitudinal axis spaced from the first central longitudinal axis in a direction orthogonal to the second central longitudinal axis. The delivery port may be in fluid communication with the first lumen. The surface extending from the delivery port into the first surface may be oriented at an obtuse or acute angle relative to the first central longitudinal axis.

Abstract: A catheter may include a hypotube defining an inner circumferential surface, an outer circumferential surface, and an end. The hypotube may include a metal or alloy. The catheter also may include an inner liner attached to the inner circumferential surface of the hypotube and extending beyond the end of the hypotube, and the inner liner may include a fluoropolymer. The catheter further may include a hub and a single bonding layer attached to the outer circumferential surface of the hypotube and bonded to the hub. The single bonding layer may include a polyamide, a polyether-co-polyamide, or polyurethane and is the only layer between the outer circumferential surface of the hypotube and the hub.

Abstract: In some examples, a catheter includes a catheter body including an outer jacket and an inner liner. The inner liner may include a proximal section including a proximal end of the inner liner and a distal section including a distal end of the inner liner. The distal section may include an inner liner defining a plurality of cuts. Each cut may extend at least partially through the liner wall. The one or more cuts defined in the liner wall of the distal section of the inner liner may increase a bending flexibility of the distal section relative to the proximal section of the inner liner, while maintaining a suitable tensile strength of the distal section.

Abstract: Example compliant hydrophilic coatings including a base coat and a lubricious top coat for coating a medical device including a flexible substrate. The coatings exhibit reduced cracking and peeling in response to deformation or expansion of the flexible substrate. Example techniques for coating a medical device including a flexible substrate with compliant hydrophilic coatings.

Abstract: In some examples, a catheter includes a catheter body including an outer jacket and an inner liner. The inner liner may include a proximal section including a proximal end of the inner liner and a distal section including a distal end of the inner liner. The distal section may include an inner liner defining a plurality of cuts. Each cut may extend at least partially through the liner wall. The one or more cuts defined in the liner wall of the distal section of the inner liner may increase a bending flexibility of the distal section relative to the proximal section of the inner liner, while maintaining a suitable tensile strength of the distal section.

Abstract: In some examples, a catheter includes an elongated body comprising proximal and distal portions. The distal portion of the elongated body comprises an inner liner that includes a proximal liner section and a distal liner section that include different materials, and an outer jacket positioned over the inner liner. The distal liner section has a first hardness and the proximal liner section has a second hardness, where the first hardness is less than the second hardness.