JP-2026514398-A - Catheter pump

JP2026514398AJP 2026514398 AJP2026514398 AJP 2026514398AJP-2026514398-A

Abstract

This application discloses a catheter pump comprising a catheter, a proximal connector, and a pump head. The proximal connector is connected to the distal end of the catheter, and the pump head comprises a stand and an impeller housed within the stand, the impeller being rotationally driven to pump blood. The stand comprises a stand body and proximal connecting legs located at the axial proximal end of the stand body, the number of proximal connecting legs being multiple, and the multiple proximal connecting legs being spaced apart along the circumferential direction of the stand. The proximal connecting legs comprises a proximal connecting rod and a proximal support rod located at the distal end of the proximal connecting rod. The proximal support rod connects to and supports the stand body, and the circumferential width of the proximal support rod is greater than the circumferential width of the proximal connecting rod. The proximal connecting rod is fixedly connected to the proximal connector. The proximal end support rod includes a first connecting portion fixedly connected to the proximal end connection portion and a first outer portion located outside the distal end of the proximal end connection portion. [Selection Diagram] Figure 1

Inventors

暑攣
顔翊凡

Assignees

マグアシストカンパニー，リミテッド

Dates

Publication Date: 20260511
Application Date: 20240425
Priority Date: 20230426

Claims (18)

It is a catheter pump, Catheter and, The catheter has a proximal end connector that is connected to the distal end, A pump head comprising a stand and an impeller housed within the stand, wherein the impeller is used to be rotationally driven to pump blood, Here, the stand can be switched between a radially folded state and a radially extended state, and in the radially extended state, the stand includes a stand body and proximal end connecting legs located at the proximal end of the stand body, the number of proximal end connecting legs is multiple, and the multiple proximal end connecting legs are arranged at intervals along the circumferential direction of the stand. The proximal end connecting leg includes a proximal end connecting rod and a proximal end support rod located at the distal end of the proximal end connecting rod, the proximal end support rod connects to and supports the stand body, and the circumferential width of the proximal end support rod is greater than the circumferential width of the proximal end connecting rod. A catheter pump characterized in that the proximal end connecting rod is fixedly connected to the proximal end connecting portion, and the proximal end support rod includes a first connecting portion fixedly connected to the proximal end connecting portion and a first outer portion located outside the distal end of the proximal end connecting portion.
The catheter pump according to claim 1, characterized in that the proximal end connecting leg further includes a proximal end wide portion fixedly connected to the proximal end connecting portion, the circumferential width of the proximal end wide portion is greater than the circumferential width of the proximal end connecting rod, and the proximal end wide portion is located at the proximal end of the proximal end connecting rod.
The catheter pump according to claim 2, characterized in that the axial length of the first connecting portion is greater than the axial length of the proximal end wide portion and less than the axial length of the proximal end connecting rod.
The catheter pump according to claim 2, characterized in that the outer wall of the proximal end connection portion is provided with a plurality of proximal end support leg grooves for fitting a plurality of proximal end connection legs in a one-to-one correspondence, a proximal end collar is fitted outside the proximal end connection portion, and the proximal end collar is used to hold the proximal end connection legs within the proximal end support leg grooves by fixing the proximal end connection legs along the radial direction of the stand.
The catheter pump according to claim 4, characterized in that the outer wall of the proximal end connection portion forms a proximal end spacing projection between two circumferentially adjacent proximal end support leg grooves, the proximal end spacing projection includes a first projection located between two adjacent first connection portions and a second projection located between two adjacent proximal end connection rods, the circumferential width of the second projection is greater than the circumferential width of the first projection, and/or the material used to manufacture the proximal end collar is a metallic material.
The catheter pump according to claim 2, characterized in that the circumferential width of the proximal end connecting rod does not change along its extending direction, and/or the circumferential width of the proximal end support rod does not change along its extending direction, and/or the circumferential width of the proximal end wide portion does not change along the extending direction of the proximal end connecting rod.
A catheter pump according to claim 1, characterized in that a proximal end transition section is provided between the proximal end support rod and the proximal end connecting rod, and in the direction from the proximal end to the distal end of the proximal end transition section, the circumferential width of the proximal end transition section gradually increases from a width equal to that of the proximal end connecting rod to a width equal to that of the proximal end support rod.
The catheter pump according to claim 1, characterized in that the proximal end connection portion is a proximal end bearing chamber provided at the distal end of the catheter, a proximal end bearing is provided in the proximal end bearing chamber, a drive shaft is drilled into the proximal end bearing, and the drive shaft is connected to the impeller to drive the rotation of the impeller.
The stand further includes distal end connecting legs located at the distal end of the stand body, the number of distal end connecting legs being multiple, and the multiple distal end connecting legs are arranged at intervals along the circumferential direction of the stand. The distal end connecting leg includes a distal end connecting rod and a distal end support rod located at the proximal end of the distal end connecting rod, the distal end support rod connects to and supports the stand body, and the circumferential width of the distal end support rod is greater than the circumferential width of the distal end connecting rod. The catheter pump according to claim 1, characterized in that the distal end connecting rod is fixedly connected to the distal end connecting portion, and the distal end support rod includes a second connecting portion fixedly connected to the distal end connecting portion and a second outer portion located outside the proximal end of the distal end connecting portion.
The catheter pump according to claim 9, characterized in that the distal end connecting leg further includes a distal end wide portion fixedly connected to the distal end connecting portion, the circumferential width of the distal end wide portion is greater than the circumferential width of the distal end connecting rod, and the distal end wide portion is located at the distal end of the distal end connecting rod.
The catheter pump according to claim 10, characterized in that the axial length of the second connecting portion is greater than the axial length of the distal end wide portion and less than the axial length of the distal end connecting rod.
The catheter pump according to claim 10, characterized in that the outer wall of the distal end connection portion is provided with multiple distal end support leg grooves for fitting multiple distal end connection legs in a one-to-one correspondence, a distal end collar is fitted outside the distal end connection portion, and the distal end collar is used to hold the distal end connection legs within the distal end support leg grooves by fixing the distal end connection legs along the radial direction of the stand.
The catheter pump according to claim 12, characterized in that the outer wall of the distal end connection portion forms a distal end spacing projection between two circumferentially adjacent distal end support leg grooves, the distal end spacing projection includes a fourth projection located between two adjacent second connection portions and a fifth projection located between two adjacent distal end connection rods, the circumferential width of the fifth projection is greater than the circumferential width of the fourth projection, and/or the material used to manufacture the distal end collar is a metallic material.
The catheter pump according to claim 10, characterized in that the circumferential width of the distal end connecting rod does not change along its extending direction, and/or the circumferential width of the distal end support rod does not change along its extending direction, and/or the circumferential width of the distal end wide portion does not change along the extending direction of the distal end connecting rod.
A catheter pump according to claim 9, characterized in that a distal end transition section is provided between the distal end support rod and the distal end connecting rod, and in the direction from the distal end to the proximal end of the distal end transition section, the circumferential width of the distal end transition section gradually increases from a width equal to that of the distal end connecting rod to a width equal to that of the distal end support rod.
The catheter pump according to claim 9, characterized in that the distal end connection portion is a distal end bearing chamber connected to the distal end of the stand, a distal end bearing is provided in the distal end bearing chamber, a drive shaft is drilled in the distal end bearing, and the drive shaft is connected to an impeller to drive the rotation of the impeller.
The catheter pump according to claim 9, characterized in that the distal end connection portion is a protective tip connected to the distal end of the distal end connection leg, the protective tip is flexible, and separates the blood inlet of the pump head from the ventricular wall.
The catheter pump according to claim 1, characterized in that a hydrophobic coating layer is provided on the surface of the stand.

Description

(Cross-reference of related applications) This application claims priority to the patent application filed with the China National Intellectual Property Administration on April 26, 2023, with application number 2023104596624 and application title "Catheter Pump". This disclosure relates to the medical device field, and more particularly to catheter pumps. Catheter pumps come in both non-foldable and foldable types. Foldable catheter pumps have the advantage of being more convenient and faster to use during intervention because they create a smaller wound. Since it is necessary to pre-fold the pump head to reduce its size and then expand and release it after interposition at a specific location (e.g., the left ventricle), the pump housing portion must be constructed using the appropriate structure. To simplify the process as much as possible, the stand portion of the pump housing is fabricated by engraving or laser cutting a single precast tube, and a connecting ring sleeve is provided at the proximal end of the stand to enable connection and fixation with the catheter. Thus, the diameter of the bushing-shaped connecting ring sleeve portion is the same as the diameter of the precast tube forming the stand portion. The diameter of the precast tubing is relatively small because it ultimately needs to meet a small size requirement for easy placement and intervention. Furthermore, the stand section needs to ultimately meet a relatively large unfolded diameter, resulting in a larger amount of material being carved, which reduces the rod width of the stand and weakens its rigidity. Conversely, if the rod width and rigidity of the stand meet the requirements, the amount of material removed during carving is reduced, resulting in a smaller unfolded diameter of the stand. Furthermore, the stand may be fabricated by sculpting using relatively large-diameter precast tubing, and finally, the connecting ring sleeve at the proximal end may be hollowed out. However, this method generates waste, is costly, and complicates the process. In practice, according to known embodiments in disclosure number CN114588533A, the distal end connection structure of the stand typically employs distributed support legs (specifically, multiple support legs arranged at intervals along the circumferential direction). However, in order to maintain a high-strength fixed connection with the catheter or proximal end bearing chamber, the proximal end connection structure of the stand currently often employs a circumferentially continuous ring sleeve structure. The reasons for this will be explained in detail below, but primarily, the circumferentially continuous ring sleeve structure prevents the pump head from lifting due to the lever principle when folded, and also maintains a fixed connection relationship with the catheter at all times. In light of this, the proximal end connection structure of the stand cannot employ the same or similar distributed support leg structure as the distal end connection structure. Furthermore, the connection structures at both ends of the stand are connected to fixed components (for example, the proximal and distal end bearing chambers, respectively), and these connection structures at both ends have portions that structurally connect to or overlap with the fixed components, with the portions extending from the fixed components forming a cantilever structure. The inlet and outlet of the stand require support from this cantilever structure, and the main body portion housing the impeller is further supported by the inlet and outlet. Therefore, how well the cantilever structure in this portion provides support rigidity is extremely important for the overall rigidity of the stand when it is deployed. In particular, the proximal end connection structure, in some cases, for example, when the pump head is folded from the proximal end, is subjected to forced compression and deformation of the proximal end cantilever structure as the sheath folds. Such compressive deformation must be recovered by the memory elasticity of the cantilever structure itself (the entire stand is made of memory material) after the sheath is removed, supporting the deployment of the inlet and main body. Therefore, maintaining good support rigidity of the proximal end cantilever structure is extremely important. A schematic diagram of the structure of a stand according to one embodiment of this disclosure is shown.A schematic diagram of the structure of a catheter pump according to one embodiment of the present disclosure is shown.A schematic diagram of the connection point between the proximal end bearing chamber and the proximal end connecting leg according to one embodiment of the present disclosure is shown.A schematic diagram of the connection point between the distal end bearing chamber and the distal end connecting leg according to one embodiment of the present disclosure is shown.This diagram shows experimental data of a stand provided with a