Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/10—Location thereof with respect to the patient's body
  • A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
  • A61M60/126—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel
  • A61M60/148—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/10—Location thereof with respect to the patient's body
  • A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
  • A61M60/126—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel
  • A61M60/13—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel by means of a catheter allowing explantation, e.g. catheter pumps temporarily introduced via the vascular system
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/10—Location thereof with respect to the patient's body
  • A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
  • A61M60/126—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel
  • A61M60/135—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel inside a blood vessel, e.g. using grafting
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/20—Type thereof
  • A61M60/205—Non-positive displacement blood pumps
  • A61M60/216—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller
  • A61M60/237—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller the blood flow through the rotating member having mainly axial components, e.g. axial flow pumps
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/40—Details relating to driving
  • A61M60/403—Details relating to driving for non-positive displacement blood pumps
  • A61M60/408—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being mechanical, e.g. transmitted by a shaft or cable
  • A61M60/411—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being mechanical, e.g. transmitted by a shaft or cable generated by an electromotor
  • A61M60/414—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being mechanical, e.g. transmitted by a shaft or cable generated by an electromotor transmitted by a rotating cable, e.g. for blood pumps mounted on a catheter
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/80—Constructional details other than related to driving
  • A61M60/855—Constructional details other than related to driving of implantable pumps or pumping devices
  • A61M60/857—Implantable blood tubes
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/80—Constructional details other than related to driving
  • A61M60/855—Constructional details other than related to driving of implantable pumps or pumping devices
  • A61M60/865—Devices for guiding or inserting pumps or pumping devices into the patient's body
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M2205/00—General characteristics of the apparatus
  • A61M2205/02—General characteristics of the apparatus characterised by a particular materials
  • A61M2205/0216—Materials providing elastic properties, e.g. for facilitating deformation and avoid breaking
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M2207/00—Methods of manufacture, assembly or production
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/20—Type thereof
  • A61M60/205—Non-positive displacement blood pumps
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49826—Assembling or joining
  • Y10T29/49828—Progressively advancing of work assembly station or assembled portion of work

Definitions

• the present disclosure relates to cannula assemblies. More specifically, the present disclosure relates to cannula assemblies implementable with a blood pump assembly, such as an intravascular heart pump system.
• Blood pump assemblies such as intracardiac or intravascular blood pumps may be introduced in the heart to deliver blood from the heart into an artery. Blood pump assemblies may be introduced percutaneously during a cardiac procedure through the vascular system. Specifically, blood pump assemblies can be inserted via a catheterization procedure through the femoral artery or the axillary/subclavian artery, into the ascending aorta, across the valve and into the left ventricle. The inserted blood pump assembly pulls blood from the left ventricle of the heart through a cannula and expels the blood into the aorta.
• the systems, methods, and devices disclosed herein provide a cannula assembly for an intravascular blood pump.
• the cannula assembly includes a cannula coupled to a dual stiffness pigtail extension.
• the dual stiffness pigtail extension has a relatively stiff proximal section and a relatively soft distal section.
• the intravascular blood pump may produce thrust forces that compress the cannula assembly against a patient's tissue.
• the stiff proximal section is stiff enough to substantially resist buckling under such compression (e.g., a hardness of 60, 70, 80, 90, 100 or higher on the Shore D scale).
• the distal portion may be soft and flexible enough so that it does tend to buckle against the patient's tissue (e.g., a hardness of 50, 40, 30, 20 or lower on the Shore D scale).
• This controlled buckling allows the proximal region of the pigtail extension to substantially maintain its original length so that it can act as a mechanical spacer. This spacing can facilitate the proper positioning of the intravascular blood pump relative to the patient's heart or vasculature.
• the stiff proximal section may prevent a blood inlet from being too close to a ventricular wall to avoid suctioning tissue.
• the stiff proximal section may ensure that an outlet of the blood pump is positioned on the opposite side of a valve (e.g., the aortic valve) relative to the inlet. This allows blood to be pumped out of the ventricle to increase cardiac output.
• the relatively soft distal section may reduce trauma to a patient's tissue.
• the softer material of the distal section may reduce stress locally induced in the patient's tissue.
• the deformation of the distal section of the pigtail may increase the area over which any force transmitted to the tissue is distributed.
• intravascular refers to a component that is positioned, in whole or in part, in a patient's vasculature, within a patient's heart, or within both.
• dual stiffness refers to a component having at least two sections of differing stiffness.
• a kit including a cannula and two or more pigtail extensions having relatively stiff proximal sections of varying lengths (e.g., 10mm, 20mm, 30mm, 40mm, 50mm, 60mm or any other suitable length).
• Each pigtail extension in the kit has a proximal end portion configured to couple to a distal end portion of the cannula.
• the coupling may be detachable to allow the physician to change a pigtail extension that is originally coupled to the cannula assembly. This allows a physician to select a pigtail extension that provides the proper spacing for positioning the intravascular blood pump for a particular patient.
• the appropriate length of the stiff proximal section is determined using imaging (e.g., X-ray, MRI, CT scan, fluoroscopy, or ultrasound) or estimated using patient data (e.g., height, sex, age, or weight).
• imaging e.g., X-ray, MRI, CT scan, fluoroscopy, or ultrasound
• patient data e.g., height, sex, age, or weight
• Various implementations provide blood pump assemblies and methods of manufacturing and implementing blood pump assemblies.
• implementations provide a cannula assembly including a cannula and a pigtail extension coupled to the cannula.
• the pigtail extension includes a proximal section having a first stiffness and a distal section having a second stiffness, the first stiffness greater than the second stiffness.
• the proximal section of the pigtail extension is positioned between the cannula and at least a portion of the distal section.
• the cannula assembly includes a pump coupled to the cannula.
• the cannula is positioned between the pump and the pigtail extension.
• the cannula assembly may include an impeller blade rotatably coupled to the pump motor.
• the impeller blade is positioned at least in part in the pump housing component, in accordance with particular implementations.
• the pump is coupled to the cannula by a pump housing component including a plurality of blood exhaust apertures, in accordance with particular implementations.
• the pump housing component includes a peripheral wall extending about a rotation axis of the impeller blade.
• the peripheral wall includes a plurality of blood exhaust apertures; each blood exhaust aperture in the plurality of blood exhaust apertures is encircled by a circumferential aperture edge.
• the circumferential aperture edge extends across the peripheral wall from an inner peripheral wall surface to an outer peripheral wall surface.
• the circumferential aperture edge includes a rounded edge portion, rounded between the inner peripheral wall surface and the outer peripheral wall surface, in accordance with particular implementations.
• the cannula component may include a blood inlet manifold.
• the blood inlet manifold may include a plurality of inlet openings.
• the proximal section of the pigtail extension is composed of nylon.
• the proximal section of the pigtail extension is composed of a polymer including, but not limited, to one or more of polyurethane or pebax.
• the distal section of the pigtail extension is composed of pebax.
• the distal section of the pigtail extension is composed of a polymer including, but not limited to, polyurethane.
• the proximal section of the pigtail extension may have a hardness or durometer in the range of 60-100 Shore D.
• the distal section of the pigtail extension may have a hardness or durometer in the range of 20-50 Shore D.
• the stiffness of the proximal portion may be altered by the addition of other materials such as glass filler or metal or fiber braids.
• Various implementations provide a method of manufacturing a cannula assembly.
• the method includes coupling a pigtail extension to a cannula.
• the pigtail extension includes a proximal section having a first stiffhess and a distal section having a second stiffhess that is less than the first stiffhess.
• the proximal section is positioned between the cannula and at least a portion of the distal section.
• the method also includes coupling a pump to the cannula.
• the cannula is positioned between the pump and the pigtail extension.
• an impeller blade is rotatably coupled to the pump motor.
• the impeller blade is positioned at least in part in the pump housing component, in accordance with particular implementations.
• the pump is coupled to the cannula by a pump housing component including a plurality of blood exhaust apertures, in accordance with particular implementations.
• the pigtail extension may be coupled to the cannula via a blood inlet manifold.
• the blood inlet manifold may include a plurality of inlet openings.
• the proximal section of the pigtail extension is composed of nylon.
• the proximal section of the pigtail extension is composed of a polymer including, but not limited to, one or more of
• the distal section of the pigtail extension is composed of pebax.
• the distal section of the pigtail extension is composed of a polymer including, but not limited to, polyurethane.
• Figure 1 shows a view of a cannula assembly, in accordance with example implementations.
• Figure 2 shows a sectional side view of a pigtail extension, in accordance with example implementations.
• Figure 3 shows an end view of the pigtail extension of Figure 2.
• Figure 4 depicts a method of manufacturing a cannula assembly, according to certain implementations.
• the systems, methods, and devices disclosed herein provide a cannula assembly for an intravascular blood pump.
• the cannula assembly includes a cannula coupled to a dual stiffness pigtail extension.
• the dual stiffness pigtail extension has a relatively stiff proximal section and a relatively soft distal section.
• the intravascular blood pump may produce thrust forces that compress the cannula assembly against a patient's tissue.
• the stiff proximal section is stiff enough to substantially resist buckling under such compression (e.g., a hardness of 60, 70, 80, 90, 100 or higher on the Shore D scale).
• the distal portion may be soft and flexible enough so that it does tend to buckle against the patient's tissue (e.g., a hardness of 50, 40, 30, 20 or lower on the Shore D scale).
• This controlled buckling allows the proximal region of the pigtail extension to substantially maintain its original length so that it can act as a mechanical spacer. This spacing can facilitate the proper positioning of the intravascular blood pump relative to the patient's heart or vasculature.
• the stiff proximal section may prevent a blood inlet from being too close to a ventricular wall to avoid suctioning tissue.
• the stiff proximal section may ensure that an outlet of the blood pump is positioned on the opposite side of a valve (e.g., the aortic valve) relative to the inlet. This allows blood to be pumped out of the ventricle to increase cardiac output.
• the relatively soft distal section may reduce trauma to a patient's tissue.
• the softer material of the distal section may reduce stress locally induced in the patient's tissue.
• the deformation of the distal section of the pigtail may increase the area over which any force transmitted to the tissue is distributed.
• intravascular refers to a component that is positioned, in whole or in part, in a patient's vasculature, within a patient's heart, or within both.
• dual stiffness refers to a component having at least two sections of differing stiffness.
• FIG. 1 shows a view of a blood pump assembly, in accordance with example implementations.
• the blood pump assembly 100 includes a blood pump 101, a housing component 102, an impeller blade 103 rotatably coupled to the blood pump 101, a cannula 104, a blood inlet manifold 105, a pigtail extension
• the blood pump 101 is coupled to the cannula 104 by the housing component 102 at a distal end of the cannula 104.
• the blood pump 101 is also coupled to the catheter 107.
• the blood pump 101 includes a motor.
• the catheter 107 may house electrical lines communicably coupling the pump 101 to one or more electrical controllers or other sensors.
• the pump 101 is driven by a flexible shaft.
• the drive portion of the motor may be located outside of the patient's body, and the catheter 107 may house the flexible shaft.
• the catheter 107 may also house other components, such as a purge fluid conduit, or other conduits configured to receive a guidewire or other procedure related components.
• the housing component 102 includes one or more apertures or openings 109 configured to expel or exhaust blood drawn into the cannula 104 out of the blood pump assembly 100.
• the housing component 102 encapsulates the blood pump 101.
• the blood pump 101 includes a micro-axial pump having a pumping capability including, but not limited to, a range of 5L/min to 2.5L/min.
• the blood pump 101 includes a micro axial pump having a diameter including, but not limited to, a range of 21 Fr to 10 Fr.
• the cannula 104 may include an elongated flexible hose portion and may include a shape memory coil, such as a nitinol coil.
• the cannula 104 is composed, at least in part, of a polyurethane material.
• the cannula 104 has a diameter including, but not limited to, a range of 12 Fr to 9 Fr.
• the cannula 104 includes a 45 ° bend.
• the cannula 104 includes the blood inlet manifold 105 coupled to the cannula 104 at a proximal end of the cannula 104 to receive blood flow into the blood pump assembly 100.
• the blood inlet manifold 105 includes one or more blood inlet openings positioned in the inlet manifold 105.
• the blood inlet manifold 105 couples the pigtail extension 106 to the cannula 104.
• the pigtail extension 106 assists with stabilizing and positioning the blood pump assembly 100 in the correct position in the left ventricle of a heart.
• the pigtail extension has an outer diameter including, but not limited to, a range of 4 Fr- 8 Fr.
• the blood pump assembly 100 is inserted percutaneously through the femoral artery or the axillary/subclavian artery and into the left ventricle. When properly positioned, the blood pump assembly 100 delivers blood from the inlet area at the blood inlet manifold 105, which sits inside the left ventricle, through the cannula 104, to the outlet openings of the housing component 102 positioned in the ascending aorta.
• the pigtail extension 106 is configurable from a straight configuration to a partially curved configuration.
• Figure 1 shows the pigtail extension in the curved configuration.
• the curve is about an axis substantially orthogonal to the central axis of the cannula.
• the curve is greater than 180 degrees (e.g., 200, 220, 240, 260, 270, 300, 320 degrees, or any suitable angle).
• the curve is less than 180 degrees (e.g., 90, 100, 120, 140, 160 degrees or any suitable angle).
• the pigtail extension 106 may be composed, at least in part, of a flexible material.
• the pigtail extension 106 has a dual stiffness.
• the pigtail extension 106 includes a distal section 107 and a proximal section 108, wherein the proximal section 108 is composed of a material having a higher stiffness than the distal section 107.
• the proximal section 108 may be composed of a different material and may have a different structure than the blood inlet manifold 105 and the cannula 104.
• the proximal section 108 is stiff enough to substantially prevent section 108 from buckling, thereby spacing the blood inlet openings in the blood inlet manifold 105 away from the ventricle apex of the heart.
• proximal section 108 also reduces the probability of the blood outlet openings or blood exhaust apertures 109 in the housing component 102 moving into the aortic valve of the heart or into the ventricle of the heart.
• the distal section 107 of the pigtail extension 106 is flexible compared to the proximal section 108 to provide an atraumatic tip for contact with the ventricle wall. The flexibility also allows a guidewire to be inserted through an inner conduit 210 of the pigtail extension 106.
• the proximal section 108 and the distal section 107 of the pigtail extension are composed of different materials having different stiffness. In certain
• the proximal section 108 and the distal section 107 of the pigtail extension are composed of the same material having different stiffness.
• the length of the proximal section 108 of the pigtail extension is selected based on the size of a left ventricle of a specific patient.
• a physician may be provided with a kit including two or more pigtail extensions having stiff proximal sections of varying lengths.
• Each pigtail extension in the kit may have a proximal end portion that is configured to couple to the cannula (e.g., at the blood inlet manifold 105).
• the proximal end portion of the pigtail extension may be configured for detachable coupling to the cannula.
• the proximal end portion of the pigtail extension may include a snap connection, an interference fit, a screw type connector, or any other suitable reversible or detachable connector.
• This allows the physician to change the pigtail extension originally coupled to the cannula, while the connection to the pigtail extension is also secure enough to prevent disconnection within the patient's vasculature.
• this allows the kit to initially include a cannula having a "standard" sized pigtail initially coupled to the catheter 104 that can be exchanged for a larger or smaller pigtail size as needed.
• the "standard" pigtail extension can be sized to
• the physician may select the pigtail extension having a proximal section of the appropriate length based on medical imaging. For example, the physician may use MRI, CT, X-ray, ultrasound, fluoroscopy or any other suitable imaging technique, to determine ventricle size. In certain
• this size is determined pre-operatively.
• the physician estimates the ventricle size using patient data (e.g., age, height, weight, sex).
• Figure 2 shows a sectional side view of a pigtail extension 206, in accordance with example implementations.
• Figure 3 shows an end view of the pigtail extension 206 of Figure 2.
• the pigtail extension 206 includes a proximal section 208, a distal section 207 including a curved tip 212, and a conduit 210 for use with a guidewire.
• the pigtail extension 206 has a dual stiffness because the proximal section 208 has a greater stiffness than the distal section 207.
• the distal section 207 and the proximal section 208 are composed of one or more layers of materials provided to give the two sections different stiffness.
• the proximal section and the distal section have a corresponding diameter.
• the proximal section 208 may be composed of a single layer of a first material having a first thickness and a first stiffness
• the distal section 207 may be composed of two layers of material.
• the two layers may include a first layer of the first material at a second thickness less than the first thickness and a second layer of a second material at a third thickness (the second and third thickness in aggregate corresponding to the first thickness) and at a second stiffness.
• the distal section 207 has an overall lower stiffness than the proximal section 208 and may specifically be configured to curl or buckle.
• the stiff proximal section 208 is stiff enough to substantially resist buckling under such compression (e.g., a hardness of 60, 70, 80, 90, 100 or higher on the Shore D scale).
• the distal portion 207 is soft and flexible enough so that it does tend to buckle against the patient's tissue (e.g., a hardness of 50, 40, 30, 20 or lower on the Shore D scale). In some implementations the distal portion may be of greater stiffness due to the incorporation of additional materials such as metals, fibers, braided metal or fiber, glass or any other suitable material.
• the proximal section may be of greater stiffness than the distal section due to the incorporation of additional materials, such as metals, fibers, braided metal or fiber, glass or any other suitable material, into the proximal section.
• additional materials may be added by injection molding, coextrusion, bonding, a thermal reflow process, or any other suitable process.
• the additional materials form a matrix or other suitable structure within the proximal section.
• the additional material may extend from the proximal section partially into the distal section to reinforce the transition from the proximal section to the distal section.
• the additional materials may be deposited between a first material layer and a second material layer of the stiff proximal section.
• incorporación of additional materials into the proximal section allows a difference in stiffness to be achieved using a single base material between the proximal and distal sections.
• the use of a single base material between the proximal and distal sections may help achieve melting in the transition region between the proximal section and the distal section. This may facilitate the joining of the proximal section to the distal section during
• the intravascular or intracardiac blood pump may produce thrust forces that compress the cannula assembly against a patient's tissue, and the stiffness of the proximal portion allows the proximal region to maintain its original length and act as a mechanical spacer to maintain proper positioning of the blood
• the stiff proximal portion 208 may prevent a blood inlet from being too close to a ventricular wall to avoid suctioning tissue.
• the stiff distal portion 208 may ensure that an outlet of the blood pump (e.g., blood pump 101) is positioned on the opposite side of a valve (e.g., the aortic valve) relative to the inlet. This allows blood to be pumped out of the ventricle to increase cardiac output.
• the relatively soft distal region may reduce trauma to a patient's tissue.
• the softer material of the distal section may reduce stress locally induced in the patient's tissue.
• the deformation of the distal section of the pigtail may increase the area over which any force transmitted to the tissue is distributed.
• the pigtail extension 206 includes a curved tip 212.
• the pigtail extension 206 is configurable from a straight configuration to a partially curved configuration.
• the curve of the curved tip is about an axis substantially orthogonal to the central axis of the cannula.
• the curve is greater than 180 degrees (e.g. 200, 220, 240, 260, 270, 300, 320 degrees, or any suitable angle).
• the curve is less than 180 degrees (e.g., 90, 100, 120, 140, 160 degrees or any suitable angle).
• the pigtail extension 206 also includes the conduit 210 extending through the proximal section and the distal section.
• the conduit 210 is sized to receive a guidewire through the pigtail extension 206.
• the proximal section 208 of the pigtail extension 206 is composed of nylon.
• the proximal section 208 of the pigtail extension 206 is composed of a polymer including, but not limited to, one or more of polyurethane or pebax.
• the distal section 207 of the pigtail extension 206 is composed of pebax.
• the distal section 207 of the pigtail extension 208 is composed of a polymer including, but not limited to, polyurethane.
• the proximal section 208 of the pigtail extension 206 may have a hardness or durometer in the range of 60-100 Shore D.
• the distal section 207 of the pigtail extension 208 may have a hardness or durometer in the range of 20-50 Shore D.
• the distal section 207 of the pigtail extension 206 includes 25-75% of the total length of the pigtail extension 206.
• Figure 4 depicts a method 400 for the manufacture of a cannula assembly according to certain implementations.
• the method 400 may be implemented to manufacture the cannula assembly 100 in any of the aforementioned
• a dual stiffness pigtail extension such as the pigtail extensions 106 or 206 of Figures 1 and 2, is coupled to the cannula.
• the pigtail extension includes a relatively stiff proximal section and a relatively flexible distal section.
• the pigtail extension may be detachably coupled to the cannula or the pigtail extension may be permanently coupled to the cannula.
• a pump is coupled to the cannula such that the cannula is positioned between the pump and the pigtail extension.
• the term “coupled” means the joining of two members directly or indirectly to one another. Such joining may be stationary or moveable in nature. Such joining may be achieved with the two members or the two members and any additional intermediate members being integrally formed as a single unitary body with one another or with the two members or the two members and any additional intermediate members being attached to one another. Such joining may be permanent in nature or may be removable or releasable in nature.
• inventive implementations may be practiced otherwise than as specifically described and claimed.
• Inventive implementations of the present disclosure are directed to each individual feature, system, article, material, kit, and/or method described herein.
• any combination of two or more such features, systems, articles, materials, kits, and/or methods, if such features, systems, articles, materials, kits, and/or methods are not mutually inconsistent, is included within the inventive scope of the present disclosure.
• the technology described herein may be implemented as a method, of which at least one example has been provided.
• the acts performed as part of the method may be ordered in any suitable way unless otherwise specifically noted. Accordingly, implementations may be constructed in which acts are performed in an order different than illustrated, which may include performing some acts simultaneously, even though shown as sequential acts in illustrative
• the phrase "at least one,” in reference to a list of one or more elements, should be understood to mean at least one element selected from any one or more of the elements in the list of elements, but not necessarily including at least one of each and every element specifically listed within the list of elements and not excluding any combinations of elements in the list of elements.
• This definition also allows that elements may optionally be present other than the elements specifically identified within the list of elements to which the phrase "at least one" refers, whether related or unrelated to those elements specifically identified.
• “at least one of A and B" can refer, in one implementation, to at least one, optionally including more than one, A, with no B present (and optionally including elements other than B); in another implementation, to at least one, optionally including more than one, B, with no A present (and optionally including elements other than A); in yet another implementation, to at least one, optionally including more than one, A, and at least one, optionally including more than one, B (and optionally including other elements); etc.

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• Engineering & Computer Science (AREA)
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