CN117919588A - Foldable impeller and ventricular assist blood pumping device - Google Patents
Foldable impeller and ventricular assist blood pumping device Download PDFInfo
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- CN117919588A CN117919588A CN202311839106.6A CN202311839106A CN117919588A CN 117919588 A CN117919588 A CN 117919588A CN 202311839106 A CN202311839106 A CN 202311839106A CN 117919588 A CN117919588 A CN 117919588A
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- 238000005086 pumping Methods 0.000 title claims description 18
- 230000002861 ventricular Effects 0.000 title claims description 18
- 239000008280 blood Substances 0.000 title claims description 13
- 210000004369 blood Anatomy 0.000 title claims description 13
- 230000006835 compression Effects 0.000 claims abstract description 21
- 238000007906 compression Methods 0.000 claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims description 37
- 230000008878 coupling Effects 0.000 claims description 9
- 238000010168 coupling process Methods 0.000 claims description 9
- 238000005859 coupling reaction Methods 0.000 claims description 9
- HZEWFHLRYVTOIW-UHFFFAOYSA-N [Ti].[Ni] Chemical compound [Ti].[Ni] HZEWFHLRYVTOIW-UHFFFAOYSA-N 0.000 claims description 7
- 229910001000 nickel titanium Inorganic materials 0.000 claims description 7
- 238000003698 laser cutting Methods 0.000 claims description 3
- 238000009941 weaving Methods 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 abstract description 7
- 206010018910 Haemolysis Diseases 0.000 abstract description 5
- 230000008588 hemolysis Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 4
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000004 hemodynamic effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000002107 myocardial effect Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000009885 systemic effect Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 210000000056 organ Anatomy 0.000 description 2
- 238000013146 percutaneous coronary intervention Methods 0.000 description 2
- 208000005189 Embolism Diseases 0.000 description 1
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 206010000891 acute myocardial infarction Diseases 0.000 description 1
- 210000000709 aorta Anatomy 0.000 description 1
- 210000001765 aortic valve Anatomy 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000017531 blood circulation Effects 0.000 description 1
- 210000004204 blood vessel Anatomy 0.000 description 1
- 230000000747 cardiac effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000004087 circulation Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 208000029078 coronary artery disease Diseases 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 208000019622 heart disease Diseases 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008065 myocardial cell damage Effects 0.000 description 1
- 208000031225 myocardial ischemia Diseases 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 229910001256 stainless steel alloy Inorganic materials 0.000 description 1
Classifications
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- 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
- A61M60/10—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
- A61M60/165—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable in, on, or around the heart
- A61M60/178—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable in, on, or around the heart drawing blood from a ventricle and returning the blood to the arterial system via a cannula external to the ventricle, e.g. left or right ventricular 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
- A61M60/80—Constructional details other than related to driving
- A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
- A61M60/804—Impellers
- A61M60/806—Vanes or blades
- A61M60/808—Vanes or blades specially adapted for deformable impellers, e.g. expandable impellers
Landscapes
- Health & Medical Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Engineering & Computer Science (AREA)
- Cardiology (AREA)
- Biomedical Technology (AREA)
- Anesthesiology (AREA)
- Mechanical Engineering (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- External Artificial Organs (AREA)
Abstract
The invention relates to a foldable impeller, comprising: the telescopic shaft comprises a plurality of shaft sections which are arranged at intervals along the axial direction, and springs are connected between the adjacent shaft sections; the impeller skeleton, it includes at least two spiral blade groups that can follow the radial inward compression of telescopic shaft, the difference spiral blade group is followed the radial from inside to outside of telescopic shaft sets gradually, every spiral blade group has at least two spiral blades along circumference evenly distributed, and it has solved among the prior art impeller in the rotation in-process, and the external diameter can outwards extend grow, leads to the technical problem that clearance between impeller and the outside pipe diminishes, prevents to appear the excessive outwards extension of impeller external diameter and makes the phenomenon that clearance between impeller and the peripheral part diminishes or gapless, guarantees the clearance between impeller and the peripheral part, also effectively avoids hemolysis index to rise.
Description
Technical Field
The invention relates to the field of medical equipment, in particular to a foldable impeller and a ventricular assist blood pumping device.
Background
The ventricular assist device is a device for providing effective circulatory support for patients with high-risk coronary heart disease and acute myocardial infarction. For Percutaneous Coronary Intervention (PCI) of Gao Weiguan heart disease patients, the clinical goal of an ideal ventricular assist device is to maintain systemic hemodynamic stability while preventing interruption of cardiac output; reducing myocardial ischemia level to minimize myocardial cell damage; reducing complications such as bleeding, peripheral tissue embolism, etc. Thus, an ideal ventricular assist device would provide systemic hemodynamic support and myocardial protection, while being safe and simple,
The ability of ventricular assist devices to provide systemic hemodynamic support and myocardial preservation is based on the rationale that it replicates the original function of the heart: blood is pumped out of the ventricle through the aortic valve into the aortic root, from where it flows through the aorta to the whole body while supplying the myocardial circulation through the coronary inlet.
In the prior art, the blood pump comprises a pump head and a driving component connected with the pump head, the impeller is an important component part of the pump head, has a folding state and an unfolding state, is folded in the intervention or taking out process and is unfolded after intervention in place, so that the intervention size is reduced, and the damage to blood vessels or corresponding organs is prevented.
In some current ventricular pumping devices, when the impeller is rotated at a high speed, the outer diameter of the impeller is extended outwards due to centrifugal force, so that the gap between the impeller and the outer catheter is reduced, the hemolysis index is increased, and even the motor is blocked.
Disclosure of Invention
Based on the above description, the invention provides a foldable impeller to solve the technical problem that in the prior art, in the rotation process of the impeller, the outer diameter can be outwards extended to be large, so that the gap between the impeller and the outer side guide pipe is reduced.
The technical scheme for solving the technical problems is as follows:
A collapsible impeller, comprising:
The telescopic shaft comprises a plurality of shaft sections which are arranged at intervals along the axial direction, and springs are connected between the adjacent shaft sections;
The impeller framework comprises at least two spiral blade groups which can be compressed inwards along the radial direction of the telescopic shaft, different spiral blade groups are sequentially arranged from inside to outside along the radial direction of the telescopic shaft, and each spiral blade group is provided with at least two spiral blades which are uniformly distributed along the circumferential direction.
Compared with the prior art, the technical scheme of the application has the following beneficial technical effects:
When the impeller provided by the application rotates at a high speed, a constraint force is formed between the shaft sections, so that the phenomenon that the clearance between the impeller and the peripheral part is reduced or is not clearance caused by excessive outward extension of the outer diameter of the impeller formed by the spiral blades due to the centrifugal force is prevented, the clearance between the impeller and the peripheral part is ensured, the hemolysis index is effectively avoided, and the device is prevented from being blocked.
On the basis of the technical scheme, the invention can be improved as follows.
Further, the telescopic shaft comprises at least three shaft sections, and two ends of the spiral blade group located at the outermost side are respectively connected to the two shaft sections at the outermost side.
Further, when the number of the shaft sections of the telescopic shaft is greater than 3, the spring comprises at least one compression spring and at least two buffer springs, at least one buffer spring is arranged at two ends of the compression spring, and the length of the compression spring is greater than that of the buffer springs.
Further, the number of the shaft sections of the telescopic shaft is six, the six shaft sections are respectively two outer shaft sections, two secondary shaft sections and two inner shaft sections, the two outer shaft sections are arranged close to the outermost side, the two secondary shaft sections are respectively positioned on one side of the two outer shaft sections, the two inner shaft sections are respectively positioned on one side of the two secondary shaft sections, the compression spring is arranged between the two inner shaft sections, and the buffer spring is arranged between the outer shaft sections and the secondary shaft sections and between the secondary shaft sections and the inner shaft sections;
The impeller skeleton comprises an outer helical blade group, a middle helical blade group and an inner helical blade group, wherein the outer helical blade group comprises outer helical blades with two ends respectively correspondingly connected with two outer shaft sections, the middle helical blade group comprises middle helical blades with two ends respectively correspondingly connected with two secondary shaft sections, and the inner helical blade group comprises inner helical blades with two ends respectively correspondingly connected with two inner shaft sections.
The application provides a ventricular assist blood pumping device, which comprises a transmission component, a supporting framework, a contraction conduit and an impeller as described above;
The transmission assembly comprises an outer tube and a transmission shaft, the transmission shaft is arranged in the outer tube, and one end of the transmission shaft is connected with a motor;
the support framework is arranged at the far end of the outer tube, is of a compressible folding structure and is internally provided with a cavity;
The impeller is in driving connection with the transmission shaft and is arranged in the cavity;
The shrink catheter is arranged on the outer side of the outer tube in a sliding mode, the shrink catheter is provided with a compression cavity, the far end of the compression cavity is open, and the support framework and the impeller can be accommodated to the compression cavity along with the movement of the shrink catheter.
Further, a motor connected with the transmission shaft is arranged outside the device, and the motor drives the impeller to rotate in a magnetic coupling mode.
Further, the transmission shaft comprises a magnetic shaft part positioned at the far end and a flexible part positioned at the near end of the magnetic shaft part, the transmission assembly further comprises a magnetic ring, the magnetic ring is rotatably arranged relative to the magnetic shaft part, the magnetic shaft part drives the magnetic ring to rotate in a magnetic coupling mode, and the impeller is arranged on the magnetic ring.
Further, the magnetic ring comprises a connecting shaft at the distal end and a sleeve at the proximal end of the connecting shaft, the proximal end of the sleeve is open, at least a part of the magnetic shaft part close to the distal end is arranged in the sleeve, and the impeller is mounted on the connecting shaft.
Further, the transmission assembly further comprises an inner tube and a shell, the inner tube is sleeved on the outer side of the transmission shaft and is positioned on the inner side of the outer tube, the sleeve is rotatably sleeved on the distal end of the inner tube, and the part of the magnetic shaft part, which is arranged in the sleeve, is not in contact with the inner tube; the outer shell is connected to the outer tube and wraps the sleeve, and the connecting shaft extends out of the distal end of the outer shell.
Further, the supporting framework comprises a framework main body and a framework coating film, the framework main body is of a bracket structure with a grid-shaped side wall, the framework coating film is arranged on the framework main body in a coating manner, an inflow opening is formed in a surrounding manner at the far end of the framework coating film, an outflow opening is formed in the near end of the framework coating film, and the caliber size of the inflow opening is larger than that of the outflow opening; the skeleton main body is a nickel-titanium weaving structure or a nickel-titanium tube laser cutting structure.
Drawings
FIG. 1 is a schematic view of a foldable impeller according to the present application;
fig. 2 is a schematic structural view of an impeller according to a first embodiment of the present application;
FIG. 3 is a schematic view of an impeller according to a second embodiment of the present application;
Fig. 4 is a schematic structural view of an impeller according to a third embodiment of the present application;
fig. 5 is a schematic structural diagram of a ventricular assist pumping device according to a fourth embodiment of the present application;
FIG. 6 is a schematic diagram of the connection between a motor and a drive shaft in an embodiment of the present application;
FIG. 7 is a schematic view of a supporting framework according to an embodiment of the present application;
FIG. 8 is an external schematic view of a transmission assembly according to an embodiment of the present application;
FIG. 9 is a schematic view in section A-A of FIG. 8;
FIG. 10 is a schematic structural diagram of a magnetic ring according to an embodiment of the present application;
fig. 11 is a schematic structural view of a transmission shaft according to an embodiment of the present application.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Embodiments of the application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be appreciated that spatially relative terms such as "under … …," "under … …," "under … …," "over … …," "over" and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "under" or "beneath" other elements would then be oriented "on" the other elements or features. Thus, the exemplary terms "below … …" and "under … …" may include both an upper and a lower orientation. Furthermore, the device may also include an additional orientation (e.g., rotated 90 ° or other orientations) and the spatial descriptors used herein interpreted accordingly.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. In the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", and the like, if the connected circuits, modules, units, and the like have electrical or data transferred therebetween.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.
As shown in fig. 1, the present application provides a collapsible impeller 30 that includes a telescoping shaft 31 and an impeller skeleton 32.
The telescopic shaft 31 comprises a plurality of shaft sections 310 which are arranged at intervals along the axial direction, and springs 33 are connected between the adjacent shaft sections;
the impeller skeleton 32 includes at least two helical blade groups that can compress inward along the radial direction of the telescopic shaft, different helical blade groups are sequentially arranged from inside to outside along the radial direction of the telescopic shaft 31, and each helical blade group has at least two helical blades uniformly distributed along the circumferential direction.
As an alternative embodiment, the number of the shaft sections 310 in the telescopic shaft 31 may be set according to the actual situation, preferably, three or more than three, it is to be understood that, in the present application, different helical blade groups are sequentially set from inside to outside along the radial direction of the telescopic shaft 31, and it is to be understood that the spatial curved surface structures formed when the different helical blade groups rotate do not interfere with each other, and that the spatial curved surfaces form a corresponding inner-outer layer relationship, that is, the spatial curved surfaces formed when the helical blade groups located at the radial side rotate are contained inside the spatial curved surfaces formed when the helical blade groups located at the radial side rotate.
As a preferred embodiment of the present application, the telescopic shaft 31 includes at least three shaft segments, and two ends of the outermost spiral blade group are respectively connected to two outermost shaft segments.
In a first embodiment of the application, the telescopic shaft 31 has three shaft sections, an outer shaft section 311 and an inner shaft section 312, respectively.
The impeller skeleton 32 includes three helical blade groups, an outer helical blade group 32a, an inner helical blade group 32b, and a middle helical blade group 32c, respectively.
The outer spiral blade group 32a comprises three outer spiral blades 321, the three outer spiral blades 321 are uniformly distributed in the circumferential direction of the telescopic shaft 31 and are spirally arranged, and two ends of each outer spiral blade 321 are respectively connected with two outer shaft sections 311 at positions close to the outer side; the inner spiral blade group 32b includes three inner spiral blades 322, the inner spiral blades 322 are uniformly distributed in the circumferential direction of the telescopic shaft 31 and are spirally arranged, and two ends of each inner spiral blade 322 are respectively connected to positions of the inner shaft section 312 near two ends; the middle spiral vane group 32c includes three middle spiral vanes 323, the three middle spiral vanes 323 are uniformly distributed in the circumferential direction of the telescopic shaft 31 and are spirally arranged, and two ends of each outer spiral vane 321 are respectively connected with two outer shaft sections 311 near the inner side.
As a more preferable solution of the present application, when the number of shaft segments of the telescopic shaft 31 is greater than 3, the spring 33 includes at least one compression spring 331 and at least two buffer springs 332, and at least one buffer spring 332 is disposed at both ends of the compression spring 331, and the length of the compression spring 331 is greater than the length of the buffer spring 332.
In a second embodiment of the application, the telescopic shaft 31 has four shaft sections, two outer shaft sections 311 near the outside and two inner shaft sections 312 near the inside, respectively.
The impeller skeleton 32 includes an outer helical blade group 32a, a middle helical blade group 32c, and an inner helical blade group 32b.
The outer spiral blade group 32a comprises three outer spiral blades 321, the three outer spiral blades 321 are uniformly distributed in the circumferential direction of the telescopic shaft 31 and are spirally arranged, and two ends of each outer spiral blade 321 are respectively connected with two outer shaft sections 311 at positions close to the outer side; the inner spiral blade group 32b includes three inner spiral blades 322, the inner spiral blades 322 are uniformly distributed in the circumferential direction of the telescopic shaft 31 and are spirally arranged, and two ends of each inner spiral blade 322 are respectively connected to the two inner shaft sections 312; the middle spiral vane group 32c includes three middle spiral vanes 323, the three middle spiral vanes 323 are uniformly distributed in the circumferential direction of the telescopic shaft 31 and are spirally arranged, and two ends of each outer spiral vane 321 are respectively connected with two outer shaft sections 311 near the inner side.
In the third embodiment of the present application, the number of the shaft sections of the telescopic shaft 31 is six, the six shaft sections are respectively two outer shaft sections 311, two secondary shaft sections 313 and two inner shaft sections 312, the two outer shaft sections 311 are disposed near the outermost side, the two secondary shaft sections 313 are respectively located at the inner sides of the two outer shaft sections 311, and the two inner shaft sections 312 are respectively located at the inner sides of the two secondary shaft sections 313.
The compression springs 331 are disposed between the two inner shaft sections 312, and the buffer springs 332 are disposed between the outer shaft section 311 and the secondary shaft section 313 and between the secondary shaft section 313 and the inner shaft section 312.
The impeller skeleton 32 includes an outer helical blade group 32a, a middle helical blade group 32c and an inner helical blade group 32b, the outer helical blade group 32a includes an outer helical blade 321 with both ends respectively corresponding to the two outer shaft sections 311, the middle helical blade group 32c includes a middle helical blade 323 with both ends respectively corresponding to the two secondary shaft sections 313, and the inner helical blade group 32b includes an inner helical blade 322 with both ends respectively corresponding to the two inner shaft sections 312.
The impeller 30 provided by the application forms a constraint force between shaft sections when rotating at a high speed, so that the impeller formed by the spiral blades is prevented from extending outwards due to centrifugal force, the phenomenon that the clearance between the impeller and peripheral parts is reduced or is not clearance caused by the excessive outwards extension of the impeller outer diameter is avoided, the clearance between the impeller and the peripheral parts is ensured, the rise of hemolysis index is effectively avoided, and the device is prevented from being blocked.
Based on the impeller, in a fourth embodiment of the present application, a ventricular assist pumping device is disclosed, which includes a transmission assembly 10, a support frame 20, an impeller 30 as provided in the third embodiment, and a constriction catheter 40.
As shown in fig. 5-9, the transmission assembly 10 includes an outer tube 11 and a transmission shaft 12, the transmission shaft 12 is disposed inside the outer tube 11, and one end of the transmission shaft 12 is connected to the motor 50.
The supporting framework 20 is arranged at the distal end of the outer tube 11, the supporting framework 20 is of a compressible folding structure, and a cavity is formed in the supporting framework 20.
In a preferred embodiment of the present application, the support frame 20 includes a frame body 21 and a frame cover 22, the frame body 21 is a frame structure with a side wall in a grid shape, the frame cover 22 is covered on the frame body 21, the frame body 21 is a nickel titanium woven structure or a nickel titanium tube laser cutting structure, the distal end of the frame cover 22 is enclosed to form an inflow port 201 and the proximal end is formed with an outflow port 202, and the caliber size of the inflow port 201 is larger than the caliber size of the outflow port 202, so as to ensure that the inflow port 201 provides enough blood inflow when the device operates and improve the blood flow of the pump.
The impeller 30 is drivingly connected to the transmission shaft 12 and disposed in the cavity, and the impeller 30 is in a compressible and foldable structure, in this embodiment, the impeller 30 is disposed near the proximal end of the supporting frame 20, and it is understood that in other embodiments of the present application, the impeller 30 may be disposed in the middle of the supporting frame 20 or near the distal end thereof, which are freely selected and designed by those skilled in the art, and it is not described herein, that the position of the impeller 30 on the supporting frame 20 and the number of the impellers 30 are not limited, that is, the impellers may be single, disposed near the proximal end or the distal end of the supporting frame 20, and the impellers 30 may be plural, preferably 2, and disposed at the front end and the rear end of the supporting frame 20, respectively.
The motor 50 can be driven by an internal motor or an external motor in a magnetic coupling way, the internal micro motor directly drives the impeller 300 to work, so as to achieve the purpose of pumping blood, the current ventricular assist pumping device generally adopts the internal motor to drive, when the device is started in operation, the internal motor runs at a high speed, so that a heating problem exists in a motor shell, a hemolysis index is increased, the risk of operation on a patient is increased, in addition, the internal motor has limited motor torque and impeller size due to the limitation of the internal motor, the matched inflow and outflow areas are limited, and the flow is limited, therefore, in the preferred embodiment of the application, the motor 50 connected with the transmission shaft 12 is arranged outside the device, the motor 50 drives the impeller 30 to rotate in a magnetic coupling way, the external motor 50 is driven in a magnetic coupling way, the external motor does not enter a human body in a mode, the internal heating problem can be effectively solved, in addition, the external motor 50 can freely set the torque within the range of the size allowed, the impeller can be fully unfolded under the torque driving, and the flow of the pump blood is ensured.
The motor 50 drives the impeller 30 to rotate by means of magnetic coupling in the present embodiment as follows:
Referring to fig. 11, the transmission shaft 12 includes a magnetic shaft portion 121 located at a distal end and a flexible portion 122 located at a proximal end of the magnetic shaft portion 121, the transmission assembly 10 further includes a magnetic ring 13, the magnetic ring 13 is rotatably disposed relative to the magnetic shaft portion 121, the magnetic shaft portion 121 drives the magnetic ring 13 to rotate in a magnetic coupling manner, and the magnetic ring 13 is connected with the impeller 30.
Specifically, the magnetic ring 13 is integrally made of a magnetic material, and as shown in fig. 10, includes a connecting shaft 131 at a distal end and a sleeve 132 at a proximal end of the connecting shaft 131, the proximal end of the sleeve 132 is open, at least a portion of the magnetic shaft 121 near the distal end is embedded in the sleeve 132, and the impeller 30 is mounted on the connecting shaft 131.
When the motor 50 drives the transmission shaft 12 to rotate, the sleeve 132 and the magnetic shaft 121 of the transmission shaft 12 realize rotation in a magnetic coupling mode, so that the impeller 30 is driven to rotate, and the purpose of pumping blood is achieved.
In a preferred embodiment of the present application, the transmission assembly 10 further includes an inner tube 14, the inner tube 14 is sleeved outside the transmission shaft 12 and is located inside the outer tube 11, the sleeve 132 is rotatably sleeved at the distal end of the inner tube 14, the portion of the magnetic shaft 121 embedded in the sleeve 132 is not in contact with the inner tube 14, more preferably, the transmission shaft 12 is entirely wrapped by the inner tube 14 and is not in direct contact with the magnetic ring 13, so that friction is reduced and heat is reduced.
Wherein the transmission assembly 10 further comprises a housing 15, the housing 15 is connected to the outer tube 11 and encloses a sleeve 132, and a connecting shaft 131 extends from the distal end of the housing 15.
The contracting catheter 40 is slidably disposed outside the outer tube 11, the contracting catheter 40 has a compression cavity 41, the distal end of the compression cavity 41 is open, the supporting framework 20 and the impeller 30 can be accommodated in the compression cavity 41 along with the movement of the contracting catheter 40, the whole device is recovered and released by the forward and backward movement of the contracting catheter 40, and when the device is conveyed to a proper position of the heart and released, the transmission assembly 10 drives the impeller 30 to rotate, so that the blood pumping function is realized, and the state in release is shown in fig. 5.
In a preferred embodiment of the present application, a protective head 60 is provided at the distal end of the support frame 20, the protective head 60 being configured to be flexible so as not to injure the organ tissue of the patient, the protective head 60 being made of a flexible material. Specifically, the protection head 6 is a flexible protrusion with an arc-shaped or winding-shaped end, and the flexible end is supported on the inner wall of the ventricle in a non-invasive or non-invasive manner, so that the inflow port 201 is separated from the inner wall of the ventricle, the inflow port 201 is prevented from being attached to the inner wall of the ventricle due to the reaction force of fluid (blood) in the working process of the device, and the effective area of pumping is ensured.
It can be understood that the materials used in the structure of the application are medical grade materials, and are mainly processed by medical grade TPU/ABS/TPE/PTFE/PEEK and other macromolecules and nickel titanium and stainless steel alloy, so that the structure has better structural strength on the premise of ensuring the safety.
The foregoing is only illustrative of the present invention and is not to be construed as limiting thereof, but rather as various modifications, equivalent arrangements, improvements, etc., within the spirit and principles of the present invention.
Claims (10)
1. A collapsible impeller, comprising:
The telescopic shaft comprises a plurality of shaft sections which are arranged at intervals along the axial direction, and springs are connected between the adjacent shaft sections;
The impeller framework comprises at least two spiral blade groups which can be compressed inwards along the radial direction of the telescopic shaft, different spiral blade groups are sequentially arranged from inside to outside along the radial direction of the telescopic shaft, and each spiral blade group is provided with at least two spiral blades which are uniformly distributed along the circumferential direction.
2. The collapsible impeller of claim 1 wherein the telescoping shaft comprises at least three shaft segments, and the two ends of the outermost set of helical blades are connected to the two outermost shaft segments, respectively.
3. The collapsible impeller of claim 2 wherein when the number of telescopic shaft sections is greater than 3, the springs comprise at least one compression spring and at least two buffer springs, at least one buffer spring being provided at each end of the compression spring.
4. A collapsible impeller as claimed in claim 3, wherein,
The number of the shaft sections of the telescopic shaft is six, the six shaft sections are respectively two outer shaft sections, two secondary shaft sections and two inner shaft sections, the two outer shaft sections are arranged close to the outermost side, the two secondary shaft sections are respectively positioned on one side of the two outer shaft sections, the two inner shaft sections are respectively positioned on one side of the two secondary shaft sections, the compression spring is arranged between the two inner shaft sections, and the buffer spring is arranged between the outer shaft sections and the secondary shaft sections and between the secondary shaft sections and the inner shaft sections;
The impeller skeleton comprises an outer helical blade group, a middle helical blade group and an inner helical blade group, wherein the outer helical blade group comprises outer helical blades with two ends respectively correspondingly connected with two outer shaft sections, the middle helical blade group comprises middle helical blades with two ends respectively correspondingly connected with two secondary shaft sections, and the inner helical blade group comprises inner helical blades with two ends respectively correspondingly connected with two inner shaft sections.
5. A ventricular assist pumping device comprising a transmission assembly, a support frame, a constriction catheter and an impeller according to any one of claims 1 to 4;
The transmission assembly comprises an outer tube and a transmission shaft, the transmission shaft is arranged in the outer tube, and one end of the transmission shaft is connected with a motor;
the support framework is arranged at the far end of the outer tube, is of a compressible folding structure and is internally provided with a cavity;
The impeller is in driving connection with the transmission shaft and is arranged in the cavity;
The shrink catheter is arranged on the outer side of the outer tube in a sliding mode, the shrink catheter is provided with a compression cavity, the far end of the compression cavity is open, and the support framework and the impeller can be accommodated to the compression cavity along with the movement of the shrink catheter.
6. The ventricular assist pumping device of claim 5, wherein a motor coupled to the drive shaft is external to the device, the motor driving the impeller to rotate by magnetic coupling.
7. The ventricular assist pumping device of claim 6 wherein the drive shaft includes a magnetic shaft portion at a distal end and a flexible portion at a proximal end of the magnetic shaft portion, the drive assembly further includes a magnetic ring rotatably disposed with respect to the magnetic shaft portion, the magnetic shaft portion magnetically coupled to rotate the magnetic ring, the impeller mounted to the magnetic ring.
8. The ventricular assist pumping device of claim 7, wherein the magnetic ring includes a connecting shaft at a distal end and a sleeve at a proximal end of the connecting shaft, the sleeve being open at a proximal end, at least a portion of the magnetic shaft portion near the distal end being disposed within the sleeve, the impeller being mounted to the connecting shaft.
9. The ventricular assist pumping device of claim 8, wherein the transmission assembly further comprises an inner tube and an outer shell, the inner tube is sleeved outside the transmission shaft and positioned inside the outer tube, the sleeve is rotatably sleeved at the distal end of the inner tube, and the portion of the magnetic shaft portion arranged in the sleeve is not in contact with the inner tube; the outer shell is connected to the outer tube and wraps the sleeve, and the connecting shaft extends out of the distal end of the outer shell.
10. The ventricular assist blood pumping device according to claim 5, wherein the support frame comprises a frame body and a frame film, the frame body is a frame structure with a side wall in a grid shape, the frame film is covered on the frame body, a distal end of the frame film encloses an inflow port and a proximal end of the frame film forms an outflow port, and a caliber size of the inflow port is larger than a caliber size of the outflow port; the skeleton main body is a nickel-titanium weaving structure or a nickel-titanium tube laser cutting structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311839106.6A CN117919588A (en) | 2023-12-28 | 2023-12-28 | Foldable impeller and ventricular assist blood pumping device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311839106.6A CN117919588A (en) | 2023-12-28 | 2023-12-28 | Foldable impeller and ventricular assist blood pumping device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117919588A true CN117919588A (en) | 2024-04-26 |
Family
ID=90749941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311839106.6A Pending CN117919588A (en) | 2023-12-28 | 2023-12-28 | Foldable impeller and ventricular assist blood pumping device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117919588A (en) |
-
2023
- 2023-12-28 CN CN202311839106.6A patent/CN117919588A/en active Pending
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