CN115920228A

CN115920228A - Catheter pump

Info

Publication number: CN115920228A
Application number: CN202211696529.2A
Authority: CN
Inventors: 徐博翎
Original assignee: Magassist Inc
Current assignee: Magassist Inc
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-04-07
Anticipated expiration: 2042-12-28
Also published as: CN115920228B

Abstract

The invention relates to the technical field of a catheter pump and discloses a catheter pump. The catheter pump is characterized in that a supporting top plate is arranged in the coating, and the supporting top plate is driven to deflect through the relative movement of a driving shaft and a catheter, so that the supporting top plate supports the wall surface of the coating, and the coating keeps a circular passage. The covering membrane is prevented from being deformed, and the highest circulation efficiency of blood entering from the stent and being discharged from the blood outlet end through the covering membrane is ensured.

Description

Catheter pump

Technical Field

The invention relates to the technical field of medical instruments, in particular to a catheter pump.

Background

An interventional catheter pump device, referred to as a blood pump for short, can pump blood. Taking left ventricle assistance as an example, in the prior art, a pump of an interventional catheter pump device is generally disposed in a left ventricle of a subject, an impeller of the pump is driven to rotate by a flexible shaft, and the flexible shaft is driven by a motor to transmit power to the pump. Also, the catheter pump is inserted into a blood vessel of a patient and can be expanded after the insertion in order to ensure stable contraction and expansion. During compression and expansion, the rotor (e.g., impeller) and the housing are typically deformed accordingly, and stability of the size of the lobe tip clearance (also called the lobe tip clearance, i.e., the spacing gap between the radially outer end of the impeller and the inner wall of the pump body housing) is an important factor in the operational stability of the blood pump.

As in the chinese patent application CN111375097a, when the expandable tubular body is in the expanded state, the distance L between the top surface of the support member at the distal end thereof and the projection of the top surface of the blade at the distal end thereof (i.e., the top surface of the blade shaft) in the axial direction is smaller than or equal to the axial deformation amount. The far end of the supporting piece is the end of the supporting piece fixedly connected with the inner wall of the expandable tube body. The axial deformation amount is a difference between an axial length of the expandable tubular body in a fully expanded state and an axial length of the expandable tubular body in a fully contracted state, and may be 3mm to 5mm. Because the distance L between the top surface of the support and the projection of the top surface of the paddle shaft in the axial direction is smaller than or equal to the axial deformation amount, when the expandable tube body is in a fully compressed state, the support can be ensured to completely enter the first through hole (all of which are understood to be the main body part of the support and may not include the distal end part connected with the inner wall of the expandable tube body), the occurrence of an additional rigid section at the distal end of the expandable tube body is effectively avoided, and the damage to the aortic arch of the patient when the expandable tube body enters the patient body is minimized.

However, the following problems still exist: when the catheter pump is operated after the catheter pump is placed in the left ventricle and the artery, the heart beats and drives blood to generate intermittent impact on the film coating pipe, so that the film coating is easy to deform, and the circulation efficiency in the film coating is reduced.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a catheter pump which has the advantages of ensuring that a covering film cannot deform during operation, ensuring the circulation efficiency of blood in the covering film and the like, and solves the problem that when the catheter pump is operated after being placed in a left ventricle and an artery, the heart beats and drives the blood to generate intermittent impact on a covering film pipe, so that the covering film is easy to deform, and the circulation efficiency in the covering film is reduced.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a catheter pump: the device comprises a machine body, an intervention component arranged on the machine body and an auxiliary mechanism arranged on the intervention component;

the interventional assembly comprises a stent and a covering membrane, wherein the covering membrane is at least partially covered on the stent, the distal end of the covering membrane is communicated with the stent, and a blood outlet end is formed in the proximal end of the covering membrane;

the auxiliary mechanism comprises supporting top plates, and a plurality of supporting top plates are distributed in the coating along the axial direction;

the intervention assembly further comprises a catheter and a drive shaft, the drive shaft penetrates through the catheter, an impeller is fixedly mounted on the drive shaft, and the impeller is located outside the catheter;

a near-end bearing chamber is fixedly arranged at one end of the guide pipe, the bracket is fixedly arranged on the near-end bearing chamber, a far-end bearing chamber is fixedly arranged at one end of the bracket, and the impeller is positioned in the bracket;

the support ceiling is configured to deflect when the drive shaft moves relative to the catheter and to distract the cover membrane when the support ceiling deflects towards the inner wall of the cover membrane.

Preferably: the stent can be expanded by moving the driving shaft relative to the catheter so as to deflect the supporting top plate towards the inner wall of the tectorial membrane.

Preferably: the motor main body is fixedly installed in the machine body, the motor main body is connected with the coupler in a power mode, a driving shaft is matched with the coupler in a rotating mode, the driving shaft is connected with the coupler in a power mode, the driving shaft is located in the guide pipe and close to the impeller, one end of the guide pipe is sealed with the driving shaft, and the driving shaft can slide relative to the guide pipe.

Preferably: the auxiliary mechanism further comprises a ball bearing, a moving ring and a through hole, the ball bearing is arranged in the guide pipe, an inner ring of the ball bearing is fixedly connected with the driving shaft, the moving ring is fixedly arranged on an outer ring of the ball bearing, and the moving ring is in sliding fit with the inner wall of the guide pipe;

the catheter distal end fixed mounting has a proximal end bearing room, fixed mounting has on the proximal end bearing room the support, support distal end fixed mounting has the distal end bearing room.

Preferably: the guide pipe is provided with a plurality of through openings, and the through openings are opposite to the moving ring;

normal running fit has a plurality of location axles on the pipe, the location axle all is located other the opening, the epaxial telescopic link that all is provided with in location, the fixed pole of telescopic link all with location axle fixed connection, the pole that stretches of telescopic link all runs through the opening, the pole that stretches of telescopic link all with the carriage release ring normal running fit, the epaxial equal fixed mounting in location has the dead lever, the dead lever all with the telescopic link is relative, the dead lever all with the telescopic link is followed location axle symmetric distribution, equal fixed mounting on the dead lever support the roof.

Preferably: the opening is circular evenly distributed, the location axle is circular evenly distributed.

Preferably: the intervention assembly further comprises a coupler, a perfusate input end and a retaining sleeve,

the machine body is fixedly provided with the coupler, the coupler is fixedly provided with the perfusate input end, the perfusate input end is communicated with the inside of the coupler, the coupler is fixedly provided with the retaining sleeve, the retaining sleeve is fixedly provided with the guide pipe, the guide pipe penetrates through the retaining sleeve, and the guide pipe is communicated with the coupler.

Preferably: the heat dissipation mechanism is arranged on the auxiliary mechanism and comprises a heat conduction ring, a partition plate, a fixing frame and a spring, the heat conduction ring is fixedly arranged in the conduit, the partition plate is in sliding fit with the heat conduction ring and penetrates through the heat conduction ring, the partition plate is opposite to the moving ring, the fixing frame is fixedly arranged in the conduit, the fixing frame is opposite to the partition plate, the spring is arranged between the fixing frame and the partition plate, one end of the spring is connected with the fixing frame, and the other end of the spring is connected with the partition plate.

Preferably: the heat conduction ring is fixedly provided with a transmission pipe, the transmission pipe is communicated with the heat conduction ring and extends to the interior of the machine body, a water box is fixedly arranged in the machine body, and the transmission pipe is communicated with the water box.

Preferably: fixed mounting has the pump machine in the organism, the work end of pump machine is located inside the water box, fixed mounting has the fin in the organism, fixed mounting has the cooling tube on the water box, the cooling tube with the water box communicates with each other, the cooling tube with the fin communicates with each other.

(III) advantageous effects

Compared with the prior art, the invention provides a catheter pump, which has the following beneficial effects:

1. the catheter pump is provided with a supporting top plate in the coating, and realizes the deflection driving of the supporting top plate through the relative movement of the driving shaft and the catheter, so that the supporting top plate supports the wall surface of the coating, and the coating keeps a circular passage.

2. The catheter pump is characterized in that the intervention assembly extends into the left ventricle from the artery, so that the covered membrane is half in the artery in the left ventricle, the support is in the left ventricle, the blood outlet end is in the artery, the starting device is used for starting the support to expand from a contraction state, the support drives the supporting top plate to deflect, the supporting top plate supports the wall surface of the covered membrane, the covered membrane keeps a circular passage, the deformation of the covered membrane is prevented, and the highest circulation efficiency of blood entering from the support through the covered membrane and being discharged from the blood outlet end is ensured.

3. This catheter pump, through when opening along with drive shaft drive support, the drive shaft drives ball bearing and removes, ball bearing drives the shifting ring and removes, the shifting ring drives the telescopic link and deflects in the opening, make telescopic link drive location axle rotate, the location axle drives the dead lever and deflects, the dead lever drives the roof that supports and deflects, make the roof that supports support the wall of tectorial membrane, so that the roof that supports forms fixed stay, ensure that the inner passage of tectorial membrane is circular passageway all the time, avoid the impact of blood to cause the tectorial membrane to produce deformation, the circulation efficiency of having ensured blood is the maximum condition all the time.

4. This catheter pump, through when the heat conduction ring does not have the route, the pump machine makes the cooling water circulation in the water box flow, and the cooling water can get into the cooling tube to produce circulation flow in getting into the fin, so that the cooling water in the water box dispels the heat, in order to ensure that the cooling water can recycle.

Drawings

FIG. 1 is a schematic view of the distribution of the internal structure of the coating film of the present invention;

FIG. 2 is a schematic view of an interventional assembly according to the present invention;

FIG. 3 is a schematic view of the internal structural distribution of the catheter of the present invention;

FIG. 4 is a schematic structural distribution diagram of the auxiliary mechanism of the present invention;

FIG. 5 is a schematic view of the structure distribution at the moving ring of the present invention;

FIG. 6 is a schematic structural diagram of a heat dissipation mechanism according to the present invention;

FIG. 7 is a schematic view of the distribution of the internal structure of the machine body according to the present invention;

fig. 8 is a schematic view of the overall structure of the catheter pump of the present invention.

In the figure: 1. a body; 2. an interventional component; 21. a coupler; 22. a perfusate input end; 23. a retaining sleeve; 24. a conduit; 25. a motor main body; 26. a drive shaft; 27. an impeller; 28. a proximal bearing chamber; 29. a support; 210. a distal bearing chamber; 211. a non-invasive support; 212. coating a film; 213. a blood outlet port; 3. an auxiliary mechanism; 31. a ball bearing; 32. a moving ring; 33. a port; 34. positioning the shaft; 35. a telescopic rod; 36. a fixing rod; 37. supporting a top plate; 4. a heat dissipation mechanism; 41. a heat conductive ring; 42. a partition plate; 43. a fixed mount; 44. a spring; 45. a conveying pipe; 46. a water box; 47. a pump machine; 48. a heat sink; 49. a heat radiation pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As described in the background of the invention, there are deficiencies in the prior art and to address the above problems, the present application provides a catheter pump.

In an exemplary embodiment of the present application, as shown in fig. 1-2, a catheter pump includes a body 1, an intervention assembly 2 disposed on the body 1, and an auxiliary mechanism 3 disposed on the intervention assembly 2, wherein the intervention assembly 2 includes a stent 29 and a covering film 212, an upper portion of the stent 29 is at least partially covered by the covering film 212, a distal end of the covering film 212 is communicated with the stent 29, and a proximal end of the covering film 212 is provided with a blood outlet port 213;

the auxiliary mechanism 3 comprises a supporting top plate 37, a plurality of supporting top plates 37 are arranged in the covering film 212, and the supporting top plates 37 are uniformly distributed in a circular shape;

the intervention assembly 2 further comprises a guide pipe 24 and a driving shaft 26, wherein the driving shaft 26 penetrates through the guide pipe 24, an impeller 27 is fixedly arranged on the driving shaft 26, and the impeller 27 is positioned outside the guide pipe 24;

a near-end bearing chamber 28 is fixedly arranged at one end of the guide pipe 24, a bracket 29 is fixedly arranged on the near-end bearing chamber 28, a far-end bearing chamber 210 is fixedly arranged at one end of the bracket 29, and the impeller 27 is positioned in the bracket 29;

the support plate 37 is configured such that when the drive shaft 26 is moved relative to the catheter 24, the support plate 37 deflects, and when the support plate 37 deflects toward the inner wall of the film 212, the support plate 37 distracts the film 212.

The stent 29 is connected to the drive shaft 26 and the catheter 24 in such a manner that the drive shaft 26 can be moved relative to the catheter 24 to deflect the support top 37 toward the inner wall of the covering 212 in the process of expanding the stent 29.

When the stent 29 is expanded during the operation treatment of the stent 212, blood enters the stent 29 into the stent 212, and the blood is discharged from the blood outlet port 213, and the stent 29 simultaneously drives the supporting top plate 37 to deflect, so that the supporting top plate 37 supports the side wall of the stent 212 after the stent 29 is completely expanded.

When the invention is used:

firstly, the interventional component 2 extends from the artery into the left ventricle, half of the covering film 212 is positioned in the artery in the left ventricle, so that the stent 29 is positioned in the left ventricle, the blood outlet end 213 is positioned in the artery, the device is started, the stent 29 is expanded from a contracted state, meanwhile, the stent 29 drives the supporting top plate 37 to deflect, the supporting top plate 37 supports the wall surface of the covering film 212, so that the covering film 212 keeps a circular passage, the covering film 212 is prevented from being deformed, and the highest circulation efficiency of blood entering from the stent 29, passing through the covering film 212 and being discharged from the blood outlet end 213 is ensured.

Further, as shown in fig. 1-4, the intervention assembly 2 further includes a coupler 21, a perfusate input end 22, a retaining sleeve 23, and a conduit 24, the coupler 21 is fixedly mounted on the body 1, the perfusate input end 22 is fixedly mounted on the coupler 21, the perfusate input end 22 is communicated with the inside of the coupler 21, the retaining sleeve 23 is fixedly mounted on the coupler 21, the conduit 24 is fixedly mounted on the retaining sleeve 23, the conduit 24 penetrates through the retaining sleeve 23, and the conduit 24 is communicated with the coupler 21.

Further, as shown in fig. 2-5, a motor main body 25 is fixedly installed in the machine body 1, the motor main body 25 is in power connection with the coupler 21, a driving shaft 26 is rotatably fitted on the coupler 21, the driving shaft 26 is in power connection with the coupler 21, the driving shaft 26 is located inside the guide pipe 24, the driving shaft 26 penetrates through the guide pipe 24, an impeller 27 is fixedly installed on the driving shaft 26, the impeller 27 is located outside the guide pipe 24, and a seal is formed between one end of the guide pipe 24 close to the impeller 27 and the driving shaft 26.

Further, as shown in fig. 2-5, one end of the catheter 24 is fixedly provided with a proximal bearing chamber 28, the proximal bearing chamber 28 is fixedly provided with a bracket 29, one end of the bracket 29 is fixedly provided with a distal bearing chamber 210, the impeller 27 is positioned inside the bracket 29, and the distal bearing chamber 210 is fixedly provided with an atraumatic support 211.

In the embodiment, the non-invasive support 211 and the catheter 24 are first introduced into the left ventricle through an artery, the stent 29 is located in the left ventricle, the blood outlet port 213 is located in the artery, and by controlling a control manner of relative movement of the drive shaft 26 and the catheter 24 (which can be realized according to technical means that can be thought by those skilled in the art, which is not described herein, in the following description, regarding movement of the drive shaft 26, the catheter 24, and connected components, which are referred to as relative movement, the relative movement can be selected as required), the drive shaft 26 drives the distal bearing chamber 210 to move, so that the distal bearing chamber 210 and the proximal bearing chamber 28 approach each other to open the stent 29, the motor main body 25 is then started, the motor main body 25 drives the coupler 21, the coupler 21 drives the drive shaft 26 to rotate, the drive shaft 26 drives the impeller 27 to rotate, so that blood flows into the graft 212 from the stent 29 through rotation of the impeller 27, and finally flows out from the blood outlet port 213.

Further, as shown in fig. 4-6, the auxiliary mechanism 3 further includes a ball bearing 31, a moving ring 32, and a through opening 33, the ball bearing 31 is disposed in the conduit 24, an inner ring of the ball bearing 31 is fixedly connected to the driving shaft 26, the moving ring 32 is fixedly mounted on an outer ring of the ball bearing 31, the moving ring 32 is in sliding fit with an inner wall of the conduit 24, the conduit 24 is provided with a plurality of through openings 33, the through openings 33 are uniformly distributed in a circular shape, and the through openings 33 are opposite to the moving ring 32.

Further, as shown in fig. 4-6, the last normal running fit of pipe 24 has a plurality of location axles 34, location axle 34 all is located by opening 33, location axle 34 is circular evenly distributed, all be provided with telescopic link 35 on the location axle 34, the pole of deciding of telescopic link 35 all with location axle 34 fixed connection, the pole of stretching of telescopic link 35 all runs through opening 33, the pole of stretching of telescopic link 35 all with shift ring 32 normal running fit, equal fixed mounting has dead lever 36 on the location axle 34, dead lever 36 all is relative with telescopic link 35, dead lever 36 all with telescopic link 35 along location axle 34 symmetric distribution, equal fixed mounting has supporting roof 37 on the dead lever 36.

Wherein, when opening along with drive shaft 26 drive support 29, drive shaft 26 drives ball bearing 31 and removes, ball bearing 31 drives shift ring 32 and removes, shift ring 32 drives telescopic link 35 and deflects in opening 33, make telescopic link 35 drive location axle 34 rotate, location axle 34 drives dead lever 36 and deflects, dead lever 36 drives and supports roof 37 and deflect, make roof 37 support the wall that supports tectorial membrane 212, so that roof 37 forms fixed stay, ensure that the internal channel of tectorial membrane 212 is circular passageway all the time, avoid the impact of blood to cause tectorial membrane 212 to produce deformation, the circulation efficiency who has ensured blood is maximum state all the time.

Further, as shown in fig. 5 to 7, the auxiliary mechanism 3 is further provided with a heat dissipation mechanism 4, the heat dissipation mechanism 4 includes a heat conduction ring 41, a partition plate 42, a fixing frame 43, and a spring 44, the heat conduction ring 41 is fixedly installed in the conduit 24, the partition plate 42 is slidably fitted on the heat conduction ring 41, the partition plate 42 penetrates through the heat conduction ring 41, the partition plate 42 is opposite to the moving ring 32, the fixing frame 43 is fixedly installed in the conduit 24, the fixing frame 43 is opposite to the partition plate 42, the spring 44 is arranged between the fixing frame 43 and the partition plate 42, one end of the spring 44 is connected to the fixing frame 43, and the other end of the spring 44 is connected to the partition plate 42.

Furthermore, a through opening is formed at one end of the partition plate 42 close to the moving ring 32, and the through opening moves into the heat conducting ring 41 when the partition plate 42 moves, so that a passage is formed inside the heat conducting ring 41.

Further, as shown in fig. 5-7, a transmission pipe 45 is fixedly installed on the heat conduction ring 41, the transmission pipe 45 is communicated with the heat conduction ring 41, the transmission pipe 45 extends into the machine body 1, a water box 46 is fixedly installed in the machine body 1, the transmission pipe 45 is communicated with the water box 46, a pump 47 is fixedly installed in the machine body 1, a working end of the pump 47 is located inside the water box 46, a heat dissipation fin 48 is fixedly installed in the machine body 1, a heat dissipation pipe 49 is fixedly installed on the water box 46, the heat dissipation pipe 49 is communicated with the water box 46, and the heat dissipation pipe 49 is communicated with the heat dissipation fin 48.

Wherein, with the movement of the moving ring 32, the moving ring 32 abuts against the partition plate 42 to move the partition plate 42, the movement of the partition plate 42 makes the internal passage of the heat conducting ring 41, and when the internal passage of the heat conducting ring 41 is formed, the heat conducting ring 41 is attached to the moving ring 32, meanwhile, the pump 47 is started, the pump 47 is operated to make the cooling water in the water box 46 generate the circulating flow, and when the heat conducting ring 41 is formed, the cooling water enters the heat conducting ring 41 through the transmission pipe 45 to circulate, so that the heat conducting ring 41 cools the moving ring 32, thereby avoiding the heat generated by the ball bearing 31 from influencing the blood, and when the heat conducting ring 41 is not formed, the pump 47 makes the cooling water in the water box 46 circulate, and the cooling water enters the radiating pipe 49 to generate the circulating flow through the radiating fin 48, so as to make the cooling water in the water box 46 radiate the heat, thereby ensuring the circulating use of the cooling water.

The working principle is as follows:

extending the interventional assembly 2 from the artery into the left ventricle with half of the cover 212 in the artery in the left ventricle so that the stent 29 is in the left ventricle and the blood outlet port 213 in the artery, activating the device, with the stent 29 expanded from the contracted state, while the stent 29 drives the support ceiling 37 to deflect, so that the support ceiling 37 supports the wall surface of the cover 212 to maintain the circular path of the cover 212;

firstly, the noninvasive support 211 and the catheter 24 are guided into the left ventricle through an artery, the stent 29 is positioned in the left ventricle, the blood outlet end 213 is positioned in the artery, then the motor body 25 is started, the driving shaft 26 is pulled, the driving shaft 26 drives the distal bearing chamber 210 to move, so that the distal bearing chamber 210 and the proximal bearing chamber 28 are close to each other to open the stent 29, then the motor body 25 drives the coupler 21, the coupler 21 drives the driving shaft 26 to rotate, the driving shaft 26 drives the impeller 27 to rotate, and blood flows into the tectorial membrane 212 from the stent 29 through the rotation of the impeller 27 and finally flows out from the blood outlet end 213;

meanwhile, when the driving shaft 26 drives the bracket 29 to open, the driving shaft 26 drives the ball bearing 31 to move, the ball bearing 31 drives the moving ring 32 to move, the moving ring 32 drives the telescopic rod 35 to deflect in the through opening 33, so that the telescopic rod 35 drives the positioning shaft 34 to rotate, the positioning shaft 34 drives the fixing rod 36 to deflect, the fixing rod 36 drives the supporting top plate 37 to deflect, and the supporting top plate 37 abuts against the wall surface of the coating film 212, so that the supporting top plate 37 forms a fixed support, and the internal channel of the coating film 212 is ensured to be a circular channel all the time;

meanwhile, along with the movement of the moving ring 32, the moving ring 32 abuts against the partition plate 42 to move the partition plate 42, the movement of the partition plate 42 enables the internal passage of the heat conducting ring 41, when the internal passage of the heat conducting ring 41 is formed, the heat conducting ring 41 is attached to the moving ring 32, meanwhile, the pump 47 is started, the pump 47 is operated to enable cooling water in the water box 46 to generate circulating flow, when the heat conducting ring 41 is formed, the cooling water enters the heat conducting ring 41 through the transmission pipe 45 to circulate, the heat conducting ring 41 cools the moving ring 32, the heat generated by the ball bearing 31 is prevented from influencing blood, when the heat conducting ring 41 is not formed, the pump 47 enables the cooling water in the water box 46 to circulate, the cooling water enters the radiating pipe 49 to generate circulating flow, and the cooling water in the radiating fin 48 is radiated, so that the cooling water in the water box 46 can be ensured to be recycled.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A catheter pump, characterized by: comprises a machine body (1), an intervention component (2) arranged on the machine body (1) and an auxiliary mechanism (3) arranged on the intervention component (2);

the interventional assembly (2) comprises a stent (29) and a covering film (212), wherein the covering film (212) is at least partially covered on the upper part of the stent (29), the distal end of the covering film (212) is communicated with the stent (29), and a blood outlet end (213) is formed in the proximal end of the covering film (212);

the auxiliary mechanism (3) comprises a supporting top plate (37), and a plurality of supporting top plates (37) are distributed in the axial direction inside the coating film (212);

the intervention assembly (2) further comprises a guide pipe (24) and a driving shaft (26), wherein the driving shaft (26) penetrates through the guide pipe (24), an impeller (27) is fixedly installed on the driving shaft (26), and the impeller (27) is located outside the guide pipe (24);

a near-end bearing chamber (28) is fixedly mounted at one end of the guide pipe (24), the support (29) is fixedly mounted on the near-end bearing chamber (28), a far-end bearing chamber (210) is fixedly mounted at one end of the support (29), and the impeller (27) is located inside the support (29);

the support roof (37) is configured such that, when the drive shaft (26) moves relative to the catheter (24), the support roof (37) deflects, and when the support roof (37) deflects towards the inner wall of the covering membrane (212), the support roof (37) struts the covering membrane (212).

2. A catheter pump according to claim 1, wherein: the stent (29) is expanded to enable the driving shaft (26) to move relative to the catheter (24) so as to enable the supporting top plate (37) to deflect towards the inner wall of the tectorial membrane (212).

3. A catheter pump according to claim 2, wherein:

the motor body (25) is fixedly installed in the machine body (1), the motor body (25) is in power connection with the coupler (21), a driving shaft (26) is matched on the coupler (21) in a rotating mode, the driving shaft (26) is in power connection with the coupler (21), the driving shaft (26) is located inside the guide pipe (24), one end, close to the impeller (27), of the guide pipe (24) is sealed with the driving shaft (26), and the driving shaft (26) can slide relative to the guide pipe (24).

4. A catheter pump according to claim 3, wherein:

the auxiliary mechanism (3) further comprises a ball bearing (31), a moving ring (32) and a through opening (33), the ball bearing (31) is arranged in the guide pipe (24), an inner ring of the ball bearing (31) is fixedly connected with the driving shaft (26), the moving ring (32) is fixedly installed on an outer ring of the ball bearing (31), and the moving ring (32) is in sliding fit with the inner wall of the guide pipe (24);

catheter (24) distal end fixed mounting has near end bearing room (28), fixed mounting has on near end bearing room (28) support (29), support (29) distal end fixed mounting has distal end bearing room (210).

5. A catheter pump according to claim 4, wherein:

the guide pipe (24) is provided with a plurality of through openings (33), and the through openings (33) are opposite to the moving ring (32);

rotation fit has a plurality of location axle (34) on pipe (24), location axle (34) all are located opening (33) are other, all be provided with telescopic link (35) on location axle (34), the pole of deciding of telescopic link (35) all with location axle (34) fixed connection, the pole of stretching of telescopic link (35) all runs through opening (33), the pole of stretching of telescopic link (35) all with shift ring (32) normal running fit, equal fixed mounting has dead lever (36) on location axle (34), dead lever (36) all with telescopic link (35) are relative, dead lever (36) all with telescopic link (35) are followed location axle (34) symmetric distribution, equal fixed mounting is gone up in dead lever (36) supporting roof (37).

6. A catheter pump according to claim 5, wherein: the through openings (33) are uniformly distributed in a circular shape, and the positioning shafts (34) are uniformly distributed in a circular shape.

7. A catheter pump according to claim 5, wherein:

the intervention assembly further comprises a coupler (21), a perfusate input (22) and a retaining sleeve (23),

fixed mounting is gone up in organism (1) coupler (21), fixed mounting is gone up in coupler (21) perfusate input end (22), perfusate input end (22) with coupler (21) inside communicates with each other, fixed mounting is gone up in coupler (21) retaining sleeve (23), fixed mounting is gone up in retaining sleeve (23) pipe (24), pipe (24) run through retaining sleeve (23), pipe (24) communicate with each other with coupler (21).

8. A catheter pump according to claim 7, wherein:

still be provided with heat dissipation mechanism (4) on complementary unit (3), heat dissipation mechanism (4) are including heat conduction ring (41), division board (42), mount (43), spring (44), pipe (24) internal fixation installs heat conduction ring (41), sliding fit has on heat conduction ring (41) division board (42), division board (42) run through heat conduction ring (41), division board (42) with it is relative to remove ring (32), pipe (24) internal fixation installs mount (43), mount (43) with division board (42) are relative, mount (43) with be provided with between division board (42) spring (44), the one end of spring (44) with mount (43) link to each other, the other end of spring (44) with division board (42) link to each other.

9. A catheter pump according to claim 8, wherein:

the heat conduction ring (41) is fixedly provided with a transmission pipe (45), the transmission pipe (45) is communicated with the heat conduction ring (41), the transmission pipe (45) extends into the machine body (1), a water box (46) is fixedly arranged in the machine body (1), and the transmission pipe (45) is communicated with the water box (46).

10. A catheter pump according to claim 9, wherein:

organism (1) internal fixed mounting has pump machine (47), the work end of pump machine (47) is located inside water box (46), organism (1) internal fixed mounting has fin (48), fixed mounting has cooling tube (49) on water box (46), cooling tube (49) with water box (46) communicate with each other, cooling tube (49) with fin (48) communicate with each other.