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CN-121971797-A - Inlet window assembly and blood pump

CN121971797ACN 121971797 ACN121971797 ACN 121971797ACN-121971797-A

Abstract

The invention relates to a blood pump distal end extension piece, an inlet window assembly and a blood pump, wherein the blood pump distal end extension piece comprises an extension tube part and a protection end part, the protection end part is connected to one end of the extension tube part, the blood pump distal end extension piece is provided with a guide wire channel, the guide wire channel penetrates through the extension tube part and the protection end part to form a first opening communicated with the guide wire channel on the protection end part, the protection end part is also provided with a plurality of communication holes communicated with the guide wire channel, each communication hole is provided with a second opening positioned on the outer surface of the protection end part, and the second openings of the plurality of communication holes are arranged at intervals around the guide wire channel. Thus, when the distal extension of the blood pump extends into the ventricle and the first opening and the second opening on one side of the outer surface of the guard end portion are blocked by the inner wall of the ventricle, at least one second opening on the other side of the outer surface of the guard end portion is exposed to the ventricle, allowing blood to flow out through the guidewire channel and the second opening, reducing thrombus formation caused by blood remaining in the guidewire channel.

Inventors

  • ZHANG JUNQIANG
  • YU SHUNZHOU

Assignees

  • 深圳核心医疗科技股份有限公司

Dates

Publication Date
20260505
Application Date
20230323

Claims (12)

  1. 1. An entrance window assembly, the entrance window assembly comprising: An inlet window provided with a liquid inlet into which blood can flow, and A blood pump distal extension member comprising an extension tube portion and a protective end portion, the protective end portion being connected to one end of the extension tube portion, the inlet window being connected to one end of the extension tube portion facing away from the protective end portion, wherein, The blood pump distal extension is provided with a guide wire channel which penetrates through the extension tube part and the protection end part to form a first opening communicated with the guide wire channel on the protection end part; The protective end is also provided with a plurality of communication holes communicated with the guide wire channel, each communication hole is provided with a second opening positioned on the outer surface of the protective end and a third opening positioned on the inner wall of the guide wire channel, and the second openings of the communication holes are arranged at intervals around the guide wire channel.
  2. 2. The entry window assembly of claim 1, wherein a plurality of the second openings are disposed one revolution about the guidewire channel and any adjacent two of the plurality of second openings are equally spaced.
  3. 3. The entrance window assembly according to claim 1, wherein a distance from the third opening to the first opening along an extending direction of the extending pipe portion is L1, and a length of the protecting end portion along the extending direction of the extending pipe portion is L2, wherein L1 is equal to or less than L2/2.
  4. 4. The entrance window assembly according to claim 1, wherein the aperture of the second opening is larger than the aperture of the third opening, and the aperture of the communication hole is gradually decreased along the outer circumferential surface of the protection end portion to the central axis of the protection end portion such that the communication hole is horn-shaped.
  5. 5. The entrance window assembly of claim 1, wherein a distance from the third opening to the first opening is a height of the third opening, wherein a plurality of the third openings are located at a same height, or wherein a height difference exists between a plurality of the third openings.
  6. 6. The entry window assembly of claim 1, wherein the extension tube portion is of flexible construction, and wherein an end of the extension tube portion connected to the protective end portion has a stiffness that is less than a stiffness of an end of the extension tube portion facing away from the protective end portion.
  7. 7. The entrance window assembly of claim 1, wherein the extension tube portion comprises a first tube segment and a second tube segment, the first tube segment being connected to the protection end, the second tube segment being located on a side of the first tube segment facing away from the protection end, wherein: The wall thickness of the second pipe section is larger than that of the first pipe section, and/or the extension pipe part further comprises a transition section, wherein the transition section is connected between the first pipe section and the second pipe section, and the radial dimension of the transition section gradually decreases along the direction from the second pipe section to the first pipe section.
  8. 8. The entry window assembly of claim 1, wherein the protective end portion is spherical or ellipsoidal and/or wherein the protective end portion has a maximum outer diameter that is greater than the outer diameter of the extension tube portion.
  9. 9. The access window assembly of claim 1, wherein the outer diameter of the protective end is smaller than the outer diameter of the access window, or wherein the blood pump distal extension includes a developer ring that fits over the extension tube portion.
  10. 10. The inlet window assembly of claim 1, wherein the inlet port communicates with the guidewire channel, the inlet window comprises a connector and an inlet tube, the connector is connected between the inlet tube and the extension tube, the inlet port is formed in the inlet tube, the connector is provided with a butt joint channel for communicating the inlet port with the guidewire channel, and the inlet tube does not exceed the outer peripheral surface of the connector.
  11. 11. The inlet window assembly of claim 10, wherein the inlet tube comprises a plurality of struts, two adjacent struts form one liquid inlet, the connecting piece is provided with a plurality of connecting grooves, the plurality of struts respectively correspond to the plurality of connecting grooves, the end part of each strut extends into the corresponding connecting groove and is connected with the groove wall of the corresponding connecting groove, and the height difference between the outer surface of the end part of the strut and the outer circumferential surface of the connecting piece is between 0.05mm and 0.2 mm; And/or the size of the liquid inlet is gradually reduced along the direction from the outer surface of the inlet window to the axis of the inlet window.
  12. 12. A blood pump comprising an inlet window assembly according to any one of claims 1 to 11.

Description

Inlet window assembly and blood pump Technical Field The invention relates to the technical field of medical equipment, in particular to an inlet window assembly and a blood pump. Background Interventional blood pumps, also known as endocardial or intravascular blood pumps, may be inserted into a blood vessel and advanced into the patient's heart to function as left or right ventricular assist devices. The distal end of the conventional interventional blood pump is prone to poor blood circulation, leading to thrombus formation, and improvement is needed. Disclosure of Invention Based on this, it is necessary to provide a blood pump distal extension, an inlet window assembly and a blood pump for the problem of poor blood circulation and thrombus formation at the distal end of the blood pump. In a first aspect, the present invention provides a blood pump distal extension comprising: Extension pipe portion The blood pump comprises a protective end part, wherein the protective end part is connected to one end of an extension tube part, a guide wire channel is arranged on the blood pump distal end extension part, the guide wire channel penetrates through the extension tube part and the protective end part, a first opening communicated with the guide wire channel is formed on the protective end part, a plurality of communication holes communicated with the guide wire channel are further formed in the protective end part, each communication hole is provided with a second opening located on the outer surface of the protective end part, and the second openings of the communication holes are arranged at intervals around the guide wire channel. In one embodiment, a plurality of the second openings are disposed one revolution around the guide wire channel, and the spacing between any adjacent two of the plurality of second openings is equal. In one embodiment, each of the communication holes further has a third opening on an inner wall of the guide wire passage, a distance from the third opening to the first opening is L1 along an extending direction of the extension pipe portion, and a length of the protecting end portion along the extending direction of the extension pipe portion is L2, wherein L1 is less than or equal to L2/2. In one embodiment, the extension pipe portion is of a flexible structure, and the rigidity of the end of the extension pipe portion connected with the protection end portion is smaller than the rigidity of the end of the extension pipe portion facing away from the protection end portion. In one embodiment, the extension pipe part comprises a first pipe section and a second pipe section, the first pipe section is connected with the protection end part, the second pipe section is positioned on one side of the first pipe section, which is away from the protection end part, wherein the wall thickness of the second pipe section is larger than that of the first pipe section, and/or the extension pipe part further comprises a transition section, the transition section is connected between the first pipe section and the second pipe section, and the radial dimension of the transition section gradually decreases along the direction from the second pipe section to the first pipe section. In one embodiment, the protecting end portion is spherical or ellipsoidal, and/or the maximum outer diameter of the protecting end portion is greater than the outer diameter of the extension tube portion. In a second aspect, the present invention also provides an inlet window assembly comprising an inlet window and a blood pump distal extension member according to any of the embodiments described above, the inlet window being connected to an end of the extension tube portion facing away from the protective end portion. In one embodiment, the inlet window is provided with a liquid inlet through which blood can flow in, the liquid inlet is communicated with the guide wire channel, the inlet window comprises a connecting piece and an inlet pipe, the connecting piece is connected between the inlet pipe and the extension pipe, the liquid inlet is provided with a butt joint channel which is communicated with the liquid inlet and the guide wire channel, and the inlet pipe does not exceed the outer peripheral surface of the connecting piece. In one embodiment, the inlet pipe comprises a plurality of struts, two adjacent struts form one liquid inlet, the connecting piece is provided with a plurality of connecting grooves, the struts respectively correspond to the connecting grooves, the end part of each strut extends into the corresponding connecting groove and is connected with the groove wall of the corresponding connecting groove, and the height difference between the outer surface of the end part of the strut and the outer circumferential surface of the connecting piece is between 0.05mm and 0.2 mm; And/or the size of the liquid inlet is gradually reduced along the direction from the outer surface of the inlet window to the a