CN113244525B - Transmission support and shunt structure and blood pumping catheter - Google Patents
Transmission support and shunt structure and blood pumping catheter Download PDFInfo
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- CN113244525B CN113244525B CN202110511666.3A CN202110511666A CN113244525B CN 113244525 B CN113244525 B CN 113244525B CN 202110511666 A CN202110511666 A CN 202110511666A CN 113244525 B CN113244525 B CN 113244525B
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Abstract
The invention discloses a transmission supporting and shunting structure and a blood pumping catheter, wherein the transmission supporting and shunting structure comprises an impeller, a first shell and a second shell which are coaxially arranged, the second shell is positioned in the first shell, a ball bearing is arranged in the second shell, the impeller is arranged on an impeller rotating shaft, the second shell forms a baffle plate structure in the area of the proximal end of the impeller, one end of the impeller rotating shaft is fixed on the ball bearing, the other end of the impeller rotating shaft penetrates through the baffle plate structure and is connected with the impeller, and the inner diameter of an inner ring of the baffle plate structure is smaller than the outer diameter of the inner ring of the ball bearing; the inner side of the first shell and the outer side of the second shell form a filling pipeline inlet cavity, and the inner side of the second shell, the inner ring and the outer ring of the ball bearing and the baffle plate structure form a filling pipeline outlet cavity. The invention has compact structure, ensures the reflux flow, can reduce the gap between the bearing and the impeller rotating shaft, and reduces the runout of the impeller shaft and the friction coefficient in the moving process.
Description
Technical Field
The invention relates to a bearing bypass structure, in particular to a transmission supporting and shunting structure and a blood pumping catheter.
Background
The percutaneous auxiliary blood pumping device comprises two classifications, wherein a blood pumping catheter and a driving module are separately arranged and connected through a flexible transmission structure, an active driving module is located outside the body, the device implanted into the blood pumping catheter in the body is driven through the flexible transmission structure to realize an auxiliary blood pumping function, and the driving module is arranged in the body.
The active driving module is positioned outside the human body, the proximal end of the flexible twisted wire is required to be connected with a motor rotating shaft, and the distal end of the flexible twisted wire is required to be connected with an impeller rotating shaft in the blood pumping catheter after passing through a complex human body vascular structure. For lubrication, damping, and evacuation of wear particles generated by the flexible skein, the flexible skein is located in a cavity filled with perfusate. When the blood pumping catheter is inserted, the flexible twisted wire needs to be bent and twisted along with the blood vessel of a human body, so that when the blood pumping device operates, the flexible twisted wire can generate jumping when rotating at a high speed. The phenomenon can lead the impeller in the blood pumping duct to rotate eccentrically or to jump in the radial direction, so that the blood flow of the pump is unstable, and friction can be generated on the contact wall surface of the impeller under serious conditions, on one hand, blood cells are destroyed in the friction process, and on the other hand, the worn particles generated by friction enter a human body to form thrombus, so that the life and the health of the human body are endangered. Therefore, at the distal impeller shaft, a supporting and diverting structure is needed to support the impeller shaft and reduce friction between the rotating member and the fixed member, and at the same time, the flow rate of the perfusion fluid in the perfusion tube needs to be ensured, so that the perfusion fluid brings the wear particles out of the perfusion chamber.
When the active driving module is positioned in a human body, the motor rotates to generate abrasion particles to enter the human body, so that the life and the health of the human body are endangered.
US8597170B2 discloses a bearing structure which is positioned by two bearings to reduce radial runout of the impeller shaft and to achieve reflux of the perfusate from the distal end to the proximal end through the gap between the bearings and the impeller shaft, the perfusate simultaneously serving to lubricate and drain debris from the catheter. As shown in fig. 1, in US8597170B2, 232a and 232B are two bearings, the perfusate is separated at 264, a portion of the perfusate enters the pump blood conduit from the 232B bearing and flows into the body, and a portion flows back from the 232a bearing to the proximal end of the perfusion tube. In order to ensure the backflow flow of the filling pipeline at the 232a bearing, the bearing 232a and the impeller rotating shaft need to have enough clearance, so that the backflow flow cannot be ensured and the radial runout of the impeller cannot be reduced.
The bearing structure mentioned in US patent document US8597170B2 has the following drawbacks:
1. in this patent, the perfusate separation site is located between the two (sleeve) bearings, and the distal bearing and the impeller shaft may rub to generate particles, which may be harmful to the human body as the perfusate enters the blood pump catheter.
2. The patent is unfavorable for the catheter to enter the human body through the complicated vascular structure because of the complex flow path structure between the two bearings, which leads to the increase of the whole length of the impeller main shaft and the increase of the inflexible length thereof, and the risk of intervention failure is increased.
3. To ensure the flow of the perfusate from the distal end, the gap between the (sleeve) bearing and the impeller shaft must be of sufficient size, at least 0.0005 inches (12.7 microns), so that the impeller runout reduction problem is not effectively addressed.
4. The patent mentions that the flow rate of the perfusate backflow can be increased by means of threading grooves on the bearing surface in the bearing, but has great process difficulty in practical machining.
5. The friction coefficient of the bearing used in the patent is between 0.15 and 0.3, and the excessively high friction coefficient may cause heat generation and abrasion between the bearing and the shaft, and simultaneously, the mechanical efficiency of the blood pump is reduced, the required flow is obtained by requiring a larger rotating speed, and the stability of the whole structure is reduced.
From the above, the prior art only considers the abrasion particles possibly generated in the impeller transmission system, but does not consider that the abrasion particles generated by friction when the bearing supports the impeller rotating shaft enter the human body, and the problems of radial runout and inflexible length of the impeller are not well solved, and meanwhile, the problem that the friction coefficient between the bearing and the impeller rotating shaft is high, so that the stability of the product is reduced, and therefore, the long-term intervention use situation of the medical instrument product cannot be satisfied.
Disclosure of Invention
The invention aims to solve the technical problem that the human health is endangered after abrasion particles generated by mechanical operation enter the human body in the field of the prior interventional medical instrument.
The technical scheme adopted by the invention for solving the technical problems is to provide a transmission supporting and shunting structure, which comprises a first shell, a second shell, a ball bearing and an impeller rotating shaft, wherein an impeller is arranged on the impeller rotating shaft, the first shell and the second shell are coaxially arranged, the second shell is positioned in the first shell, the ball bearing is fixed in the second shell, the second shell forms a baffle structure in the area of the near end of the impeller, one end of the impeller rotating shaft is fixed on the ball bearing, the other end of the impeller rotating shaft penetrates through the baffle structure and is connected with the impeller, and the inner diameter of an inner ring of the baffle structure is smaller than the outer diameter of the inner ring of the ball bearing; the inner side of the first shell and the outer side of the second shell form a filling pipeline inlet cavity, the inner side of the second shell, the ball bearing inner ring, the ball bearing outer ring and the baffle plate structure form a filling pipeline outlet cavity, filling liquid flows into the filling pipeline inlet cavity from outside, then is split at the baffle plate structure, flows into the impeller body from one way, flows into the filling pipeline outlet cavity from the other way, flows into the roller bearing from a gap between the baffle plate structure and the impeller rotating shaft, and is discharged from outside.
Further, the second shell comprises a far-end fixing frame, a near-end fixing frame, a far-end sealing cover and a near-end sealing cover; the far-end side of the far-end fixing frame is provided with the far-end sealing cover, the far-end sealing cover is of a baffle structure, the near-end side of the near-end fixing frame is provided with the near-end sealing cover, the far-end fixing frame is fixedly connected with the near-end fixing frame, the ball bearing is fixed on the far-end fixing frame, and the far-end fixing frame and the near-end fixing frame are of hollow structures and form an outlet cavity of the filling pipeline together with the ball bearing; the first shell is arranged outside the far-end fixing frame and the near-end fixing frame, the impeller rotating shaft penetrates through the far-end sealing cover and the near-end sealing cover, and a slot is formed in the far-end fixing frame, so that a perfusion pipeline inlet cavity is formed between the far-end fixing frame and the inner wall of the first shell; the proximal end fixing frame, the distal end sealing cover and the outer side of the proximal end sealing cover form an inflow pipeline of a perfusion pipeline, perfusate flows into the impeller through the inflow pipeline of the inflow cavity of the perfusion pipeline, and is separated into two paths at the distal end sealing cover, one path enters the body from the position between the proximal end of the impeller and the distal end fixing frame, the other path flows into the outflow cavity of the perfusion pipeline from a gap between the rotating shaft of the impeller and the distal end sealing cover, and the perfusate is discharged from the body after flowing through the ball.
Further, the number of the ball bearings is a plurality, and the plurality of the ball bearings are completely positioned in the outlet cavity of the filling pipeline; the impeller rotating shaft is provided with a shaft shoulder, the ball bearing close to the far end is abutted with the far-end sealing cover, and the ball bearing close to the near end is abutted with the shaft shoulder on the impeller rotating shaft.
Further, the first casing and the second casing are respectively designed in half, each half of the second casing is formed by integral injection molding, after the ball bearing and the impeller rotating shaft are assembled in the second casing, the two halves of the second casing are connected into an integral structure, each half of the first casing is formed by integral injection molding, and after the first casing and the second casing are coaxially assembled, the two halves of the first casing are connected into an integral structure.
Further, a motor winding coil is arranged in the second shell, a magnet is arranged at one end, far away from the impeller, of the impeller rotating shaft, the second shell is externally connected with a wire harness, and after the motor winding coil is electrified, a stable magnetic field with magnetism opposite to that of the magnet is formed, so that the impeller rotating shaft drives the impeller to rotate.
Further, a motor winding coil is arranged in the second shell, one end, far away from the impeller, of the impeller rotating shaft is connected with a rotor with a magnet, the second shell is externally connected with a wire harness, and after the motor winding coil is electrified, a stable magnetic field with opposite magnetism is formed by the motor winding coil and the magnet, so that the rotor is driven to rotate after rotating.
Further, the bearing outer ring of the ball bearing and the second shell are fixed in a close-fit mode.
The invention also provides a blood pumping catheter for solving the technical problems, wherein the transmission supporting and shunting structure is arranged at the far end of the blood pumping catheter entering a human body.
Further, the middle part of the blood pumping catheter also comprises a perfusion pipeline, the perfusion pipeline is connected with the first shell and the second shell, the perfusion pipeline comprises a first pipeline and a second pipeline, after the perfusion liquid flows into the perfusion liquid inlet cavity from the first pipeline, the perfusion liquid is split at the near end of the impeller, one path of perfusion liquid flows out of the impeller into the body, and the other path of perfusion liquid flows out of the second pipeline to the outside of the body after flowing out of the impeller out of the cavity.
Compared with the prior art, the invention has the following beneficial effects: the transmission supporting and shunting structure provided by the invention has a compact structure, reduces the length of the inflexible part in the guide pipe, is beneficial to guide pipe intervention, reduces the friction coefficient in the moving process of the impeller rotating shaft, provides enough clearance and ensures the backflow flow. In addition, the bearing is completely positioned in the backflow cavity of the perfusion pipeline, so that abrasion particles generated by the bearing can be prevented from entering a human body, and the safety and the effectiveness of a product are well ensured; and the clearance between the bearing and the impeller rotating shaft can be reduced, and the runout of the impeller rotating shaft is reduced.
Drawings
FIG. 1 is a schematic diagram of a perfusion fluid circuit of a conventional pump catheter;
FIG. 2 is an exploded view of the drive support and shunt structure of the present invention;
FIG. 3 is a schematic cross-sectional view of a transmission support and shunt structure according to the present invention;
FIG. 4 is a schematic view of the transmission support and shunt structure of the present invention partially broken away;
FIG. 5 is a schematic cross-sectional view of the ball bearing and retainer structure of FIG. 2;
FIG. 6 is an exploded view of the drive support and shunt structure of the present invention employing an integral process;
FIG. 7 is a schematic view of the ball bearing and stop structure of FIG. 6 mated;
FIG. 8 is a schematic cross-sectional view of a transmission support and shunt structure of the present invention using an integral process;
FIG. 9 is a schematic cross-sectional view of a drive support and shunt structure in an in-vivo motor using an integrated design in accordance with the present invention;
fig. 10 is a schematic diagram showing the separate arrangement of the impeller shaft and rotor in the in-vivo motor of the present invention.
Fig. 11 is a schematic diagram of a perfusion circuit of a pump catheter of the present invention.
In the figure:
1 far-end fixing frame 2 near-end fixing frame 3 far-end sealing cover
4 proximal seal cover 5 impeller 6 ball bearing
7 impeller rotating shaft 8 first shell 9 filling pipeline inlet cavity
10 pouring pipeline outlet cavity 11 slotting 12 shaft shoulder
13 second housing 14 rotor 15 magnet
16 first pipeline 17 second pipeline 18 external transfusion device
601 bearing inner race 602 bearing outer race 1301 separation blade structure
Detailed Description
The invention is further described below with reference to the drawings and examples.
Referring to fig. 2, 3 and 4, the transmission supporting and shunting structure provided by the present invention includes a first casing 8, a second casing, a ball bearing 6 and an impeller rotating shaft 7, wherein an impeller 5 is disposed on the impeller rotating shaft 7, the first casing 8 and the second casing are coaxially disposed, the second casing is located inside the first casing 8, the ball bearing 6 is fixed in the second casing, the second casing forms a baffle structure 1301 in a region of a proximal end of the impeller 5, one end of the impeller rotating shaft 7 is fixed on the ball bearing 6, the other end of the impeller rotating shaft 7 passes through the baffle structure and then is connected with the impeller 5, and an inner diameter D1 of an inner ring of the baffle structure is smaller than an outer diameter D2 of an inner ring 601 of the ball bearing, as shown in fig. 5;
the inner side of the first shell 8 and the outer side of the second shell form a filling pipeline inlet cavity 9, the inner side of the second shell, the bearing inner ring 601, the bearing outer ring 602 and the baffle plate structure 1301 form a filling pipeline outlet cavity 10, the filling liquid flows into the filling pipeline inlet cavity 9 from outside and then is split at the baffle plate structure 1301, flows into the impeller 5, flows into the filling pipeline outlet cavity 10 from the gap between the baffle plate structure 1301 and the impeller rotating shaft 7, and flows into the roller bearing 6 in the filling pipeline outlet cavity 10 and then is discharged outside.
The second shell comprises a far-end fixing frame 1, a near-end fixing frame 2, a far-end sealing cover 3 and a near-end sealing cover 4, wherein the far-end sealing cover 3 is positioned on the far-end fixing frame 1, the near-end sealing cover 4 is positioned on the near-end fixing frame 2, the far-end sealing cover 3 and the near-end sealing cover 4 seal a ball bearing 6 and an impeller rotating shaft 7, and the far-end sealing cover 3 is a baffle structure; the second housing is provided with a first housing 8. The sealing is to seal the wear particle generating component in the outlet cavity 10 of the perfusion tube by using a distal sealing cover and a proximal sealing cover, but a gap is left between the distal sealing cover 3 and the impeller rotating shaft 7 for backflow of perfusion liquid.
As shown in fig. 5, the inner diameter D1 of the inner ring of the distal seal cover 3 is smaller than the outer diameter D2 of the bearing inner ring 601 of the ball bearing 6, so that when the perfusate enters the perfusate outlet chamber 10 of the perfusate pipe from the gap between the distal seal cover 3 and the impeller rotating shaft 7, the perfusate flows through the gap between the inner ring and the outer ring of the ball bearing, so that the wear particles generated in the ball are carried out of the body, and the function of bearing lubrication can be also achieved.
According to the invention, the flowing perfusate is adopted in both shells, so that the flowing perfusate is utilized to carry away abrasion particles generated by mechanical movements of the ball bearing 6, the impeller rotating shaft 7 and the like, friction is avoided between the blade rotating shaft 7 and the baffle plate structure, and zero abrasion particles can enter the body.
The invention adopts the ball bearing 6 as a bearing piece, and the ball bearing 6 is arranged outside the impeller rotating shaft 7; the impeller rotating shaft 7 penetrates through the far-end fixing frame 1 and the near-end fixing frame 2 and is connected with the impeller 5. The impeller rotating shaft 7 is provided with a shaft shoulder 12, the bearing piece is abutted with the far-end fixing frame 1, and the bearing piece is abutted with the shaft shoulder 12 on the impeller rotating shaft 7. The far-end sealing cover 3 and the impeller 5 are positioned on the far-end side of the far-end fixing frame 1, the near-end sealing cover 4 is positioned on the near-end side of the near-end fixing frame 2, the far-end fixing frame 1 and the near-end fixing frame 2 are fixedly connected, and the far-end fixing frame 1 and the near-end fixing frame 2 are of hollow structures to form a filling pipeline outlet cavity 10, namely a filling pipeline outlet cavity. A slot 11 is arranged on the far-end fixing frame 1, so that a filling pipeline inlet cavity is formed between the far-end fixing frame 1 and the inner wall of the shell 8; the proximal end fixed frame 2, the distal end sealing cover 3, the inflow pipeline of the perfusion pipeline is formed outside the proximal end sealing cover 4, the perfusion fluid flows into the proximal end of the impeller 5 through the inflow pipeline of the inflow cavity 9 of the perfusion pipeline, and is separated into two paths at the proximal end of the impeller, one path flows out from between the proximal end of the impeller 5 and the distal end fixed frame 1 to the blood pumping catheter, and the other path flows into the outflow cavity 10 of the perfusion pipeline from the gap between the impeller rotating shaft 7 and the distal end sealing cover 3, so that the perfusion fluid flows from the distal end of the pipeline to the proximal end of the perfusion pipeline.
One or more of the distal fixing frame 1, the distal sealing cover 3, the proximal fixing frame 2 and the proximal sealing cover 4 adopted by the invention can be integrally processed, so that the structure is more compact, and as shown in fig. 6 and 8, the distal fixing frame 1, the distal sealing cover 3, the proximal fixing frame 2 and the proximal sealing cover 4 can be all radially and integrally processed in half, and then the two halves are welded to form the second shell 13. Specifically, the first casing 8 and the second casing 13 are respectively designed in half, each half of the second casing 13 is formed by integral injection molding, and after the ball bearing 6 and the impeller rotating shaft 7 are assembled in the second casing 13, the two halves of the second casing 13 are connected into an integral structure; each half of the first housing 8 is integrally injection molded, and after the first housing 8 and the second housing 13 are coaxially assembled, the two halves of the first housing 8 are connected into an integral structure, such as by welding. The second housing 13 forms a flap arrangement 1301 in the region of the proximal end of the impeller 5, as shown in fig. 7.
The transmission supporting and dividing structure provided by the invention has the advantages that the baffle plate structure 1301 ensures that the ball bearings 6 are completely positioned in the outlet cavity 10 of the filling pipeline, filling liquid flows out from the inside of the bearing piece, a gap is not required to be reserved between the ball bearings 6 and the impeller rotating shaft 7, the ball bearings 6 are fixed on the impeller rotating shaft 7, the ball bearings 6 are positioned on one side of the impeller rotating shaft 7, and the number of the ball bearings 6 can be one, two or more. No matter the number of the ball bearings 6 is several, no gap is reserved between the ball bearings 6, the radial direction of the impeller rotating shaft 7 can be ensured not to jump, and the length of the impeller rotating shaft can be shortened due to the reduction of the reserved gap, so that the length of the inflexible part in the catheter is reduced, and the catheter intervention is facilitated.
The bearing inner ring 601 of the ball bearing 6 is fixed to the impeller shaft 7 by tight fit, clearance fit or transition fit, and is not particularly limited herein. The bearing outer ring 602 of the ball bearing 6 is tightly connected with the distal fixing frame 1, and of course, a clearance fit or a transition fit can be adopted, and the fit mode between the inner ring and the outer ring can be selected according to practical application.
As shown in fig. 7, the inner diameter D1 of the inner ring of the baffle plate structure 1301 is smaller than the outer diameter D2 of the inner ring 601 of the bearing, so that the perfusion flow is ensured between the inner ring and the outer ring of the ball bearing, and the radial runout of the impeller can be reduced while the perfusion flow is ensured because no gap or thread groove is required to be reserved between the bearing and the rotating shaft of the impeller to ensure the perfusion flow.
If a single bearing structure is adopted, radial runout of the impeller shaft may still be caused during high-speed rotation due to insufficient limitation of the degree of freedom, so that the number of the ball bearings 6 is preferably plural, namely two or more, and the double ball bearings play a role in supporting the impeller rotating shaft and limiting the degree of freedom of the impeller rotating shaft. The plurality of ball bearings 6 are located entirely within the filling line outlet chamber 10, so that the returning filling fluid is able to carry the wear particles generated by the ball bearings away from the distal end of the filling line to the proximal end of the filling line and out, while the filling fluid lubricates the bearings. The impeller rotating shaft 7 is provided with a shaft shoulder 12, the ball bearing 6 near the far end is abutted against the far end sealing cover 3, and the ball bearing 6 near the near end is abutted against the shaft shoulder 12 on the impeller rotating shaft. In order to reduce the incompressible length in the guide tube, a plurality of ball bearings are preferably arranged side by side, so that the bearing structure is more compact, and radial runout of the impeller shaft during high-speed rotation is effectively avoided.
The invention may employ an in-vivo motor, in which case the perfusion fluid flows through the interior of the motor, with the rotor and bearing members in the motor forming the outlet cavity of the perfusion tube. The rotor and the impeller shaft of the motor of the invention may also be integrally arranged, i.e. the impeller shaft 7 constitutes the rotor of the motor module, the impeller shaft 7 passing through the second housing 13 and being connected to the impeller 5. The second shell 13 is internally provided with a motor winding coil, one end, far away from the impeller, of the impeller rotating shaft 7 is provided with a magnet 15, the second shell 13 is externally connected with a wire harness, and after the motor winding coil is electrified, a stable magnetic field with magnetism opposite to that of the magnet is formed, so that the impeller rotating shaft 7 drives the impeller 5 to rotate, as shown in fig. 9.
In addition, the impeller rotating shaft 7 and the rotor in the in-vivo motor can also be separately arranged, a motor winding coil is arranged in the second shell 13, one end of the impeller rotating shaft 7, which is far away from the impeller, is connected with the rotor 14 with a magnet, the second shell 13 is externally connected with a wiring harness, and a stable magnetic field with opposite magnetism is formed between the motor winding coil and the magnet 15 after the motor winding coil is electrified, so that the rotor 14 drives the impeller rotating shaft 7 to rotate after rotating, as shown in fig. 10.
The motor is arranged in the transmission supporting and shunting structure, the first motor can realize the function of providing power, the second motor can realize the function of bringing the abrasion particles out of the body, and the third motor generates heat which is brought out of the body through the perfusate because the perfusate flows through the motor, so that an additional heat dissipation or cooling system is not needed to be additionally arranged.
The invention also provides a blood pumping catheter, as shown in fig. 11, wherein the transmission supporting and shunting structure is arranged at the far end of the blood pumping catheter entering the human body. Further, the infusion device also comprises an infusion pipeline, the infusion pipeline is connected with the first shell 8 and the second shell 13, the infusion pipeline comprises a first pipeline 16 and a second pipeline 17, after the infusion liquid flows into the infusion liquid inlet cavity 9 from the first pipeline 16, the infusion liquid is split at the proximal end of the impeller, one path of infusion liquid flows out of the impeller 5 into a human body, and the other path of infusion liquid flows out of the second pipeline 17 to the external infusion device 18 after flowing out of the cavity 10.
In summary, the invention has the following advantages: 1. compared with the prior art, the filling inlet is positioned at the far end of the bearing, and the ball bearing is completely positioned in the filling reflux cavity, so that generated abrasion particles can be effectively ensured not to enter a human body, and the safety is high. 2. Compared with the prior art, the ball bearings are adopted, the gap between the ball bearings is utilized to form a pouring pipeline passage, and no additional process is needed to ensure the reflux flow. 3. Compared with the prior art, the ball bearing structure can greatly reduce the friction coefficient, so that the friction coefficient can reach 0.001 to 0.0015.4. Compared with the prior art, the ball bearing structure is adopted, so that the clearance between the impeller rotating shaft and the bearing is lower than 5 microns, and the radial runout of the impeller rotating shaft is reduced.
While the invention has been described with reference to the preferred embodiments, it is not intended to limit the invention thereto, and it is to be understood that other modifications and improvements may be made by those skilled in the art without departing from the spirit and scope of the invention, which is therefore defined by the appended claims.
Claims (8)
1. The transmission supporting and shunting structure is characterized by comprising a first shell, a second shell, a ball bearing and an impeller rotating shaft, wherein an impeller is arranged on the impeller rotating shaft, the first shell and the second shell are coaxially arranged, the second shell is positioned in the first shell, the ball bearing is fixed in the second shell, the second shell forms a baffle structure in the area of the near end of the impeller, one end of the impeller rotating shaft is fixed on the ball bearing, the other end of the impeller rotating shaft penetrates through the baffle structure and then is connected with the impeller, and the inner diameter of an inner ring of the baffle structure is smaller than the outer diameter of the inner ring of the ball bearing;
the inner side of the first shell and the outer side of the second shell form a filling pipeline inlet cavity, the inner side of the second shell, a bearing inner ring of the ball bearing, a bearing outer ring of the ball bearing and the baffle plate structure form a filling pipeline outlet cavity, the filling liquid flows into the filling pipeline inlet cavity from outside, then is split at the baffle plate structure, flows into the impeller body from one path, flows into the filling pipeline outlet cavity from a gap between the baffle plate structure and the impeller rotating shaft, and flows into the roller bearing in the filling pipeline outlet cavity and then is discharged from outside;
the motor winding coil is arranged in the second shell, a magnet is arranged at one end, far away from the impeller, of the impeller rotating shaft, the second shell is externally connected with a wire harness, and after the motor winding coil is electrified, a stable magnetic field with opposite magnetism is formed by the motor winding coil and the magnet, so that the impeller rotating shaft drives the impeller to rotate.
2. The drive support and shunt structure of claim 1, wherein said second housing comprises a distal mount, a proximal mount, a distal seal cap, and a proximal seal cap;
the far-end side of the far-end fixing frame is provided with the far-end sealing cover, the far-end sealing cover is of a baffle structure, the near-end side of the near-end fixing frame is provided with the near-end sealing cover, the far-end fixing frame is fixedly connected with the near-end fixing frame, the ball bearing is fixed on the far-end fixing frame, and the far-end fixing frame and the near-end fixing frame are of hollow structures and form an outlet cavity of the filling pipeline together with the ball bearing;
the first shell is arranged outside the far-end fixing frame and the near-end fixing frame, the impeller rotating shaft penetrates through the far-end sealing cover and the near-end sealing cover, and a slot is formed in the far-end fixing frame, so that a perfusion pipeline inlet cavity is formed between the far-end fixing frame and the inner wall of the first shell;
the proximal end fixing frame, the distal end sealing cover and the outer side of the proximal end sealing cover form an inflow pipeline of a perfusion pipeline, perfusate flows into the impeller through the inflow pipeline of the inflow cavity of the perfusion pipeline, and is separated into two paths at the distal end sealing cover, one path enters the body from the position between the proximal end of the impeller and the distal end fixing frame, the other path flows into the outflow cavity of the perfusion pipeline from a gap between the rotating shaft of the impeller and the distal end sealing cover, and the perfusate is discharged outside the body after flowing through the rolling balls.
3. The drive support and shunt structure of claim 1, wherein said plurality of ball bearings is a plurality, a plurality of said ball bearings being entirely within said fill tube outlet cavity; the impeller rotating shaft is provided with a shaft shoulder, the ball bearing close to the far end is abutted with the far-end sealing cover, and the ball bearing close to the near end is abutted with the shaft shoulder on the impeller rotating shaft.
4. The transmission support and distribution structure according to claim 1, wherein the first housing and the second housing are respectively designed in half, each half of the second housing is integrally injection molded, after the ball bearing and the impeller rotating shaft are assembled in the second housing, the two halves of the second housing are connected into an integral structure, each half of the first housing is integrally injection molded, and after the first housing and the second housing are coaxially assembled, the two halves of the first housing are connected into an integral structure.
5. The transmission support and shunt structure of claim 1, wherein a motor winding coil is disposed in the second housing, one end of the impeller rotating shaft away from the impeller is connected with a rotor with a magnet, the second housing is externally connected with a wire harness, and the motor winding coil forms a stable magnetic field with the magnet in a magnetic opposite manner after being electrified, so that the rotor rotates to drive the impeller rotating shaft to rotate.
6. The transmission support and shunt structure of claim 1, wherein said ball bearing outer race is secured to said second housing in a close-fitting manner.
7. A pump blood conduit, characterized in that the distal end of the pump blood conduit entering the human body is provided with a transmission support and shunt structure according to any one of claims 1-6.
8. The pump-catheter of claim 7, further comprising a perfusion tube connected to the first housing and the second housing, wherein the perfusion tube comprises a first tube and a second tube, wherein the perfusion fluid from the first tube flows into the perfusion fluid inlet chamber, is split at the proximal end of the impeller, flows out of the impeller into the body, and flows out of the second tube through the perfusion fluid outlet chamber to the outside.
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| CN202110511666.3A CN113244525B (en) | 2021-05-11 | 2021-05-11 | Transmission support and shunt structure and blood pumping catheter |
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| CN202110511666.3A CN113244525B (en) | 2021-05-11 | 2021-05-11 | Transmission support and shunt structure and blood pumping catheter |
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| CN113244525B true CN113244525B (en) | 2023-07-04 |
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|---|---|---|---|---|
| CN116059526A (en) * | 2021-11-03 | 2023-05-05 | 上海心恒睿医疗科技有限公司 | Perfusion cleaning device and percutaneous blood pumping device |
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| CN113244525A (en) | 2021-08-13 |
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Address after: No.36, Lane 100, Banxia Road, Pudong New Area, Shanghai, 201318 Applicant after: Fengkaili medical instrument (Shanghai) Co.,Ltd. Address before: No.36, Lane 100, Banxia Road, Pudong New Area, Shanghai, 201318 Applicant before: FORQALY MEDICAL (SHANGHAI) Co.,Ltd. |
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