CN115779257A - Novel intervention catheter pump - Google Patents

Abstract

The invention discloses a new type of interventional catheter pump, which relates to the field of medical devices and includes: a casing, the casing includes a first circular tube section, a tapered tube section and a second circular tube section connected in sequence, and the diameter of the second circular tube section is larger than that of the first circular tube section. The diameter of the pipe section, the second round pipe section is provided with a support shaft coaxial with the second round pipe section; a plurality of blood pumps, each blood pump is detachably connected to the support shaft; all blood pumps are connected in parallel and along the support shaft Circumferentially distributed, or, all blood pumps are connected in series and distributed along the axial direction of the support shaft; when all blood pumps are connected in parallel: a plurality of support rods are also arranged in the second round pipe section, and the first end of the support rod is connected to the second round pipe section. The inner wall is connected, and the second end of the support rod is connected with the support shaft; when all the blood pumps are connected in series: part of the support shaft is located in the second circular tube section, and the other part protrudes from the end of the second circular tube section away from the tapered tube section. The invention can reduce the blood damage and blood vessel damage caused by the ventricle assisting device while assisting the heart blood circulation.

Description

A new type of interventional catheter pump

technical field

The invention relates to the field of medical equipment, in particular to a novel intervention catheter pump.

Background technique

Heart failure is a growing medical problem with high morbidity and mortality. Ventricular assist device (VAD) plays an important role in the treatment of heart failure patients, has been used clinically for many years and saved many patients. Currently there is a miniature catheter pump, which is mainly used for the treatment of acute heart failure or high-risk PCI operations, such as the Impella series. This kind of catheter pump mainly reaches the aortic arch through the femoral artery intervention, and is inserted into the left ventricle through the aortic valve to assist or replace the pumping function of the heart and provide short-term support for patients with heart failure. Compared with the general VAD, this kind of catheter pump has a small volume, so it needs a very high speed (about 30,000 revolutions per minute) to meet the blood flow and pressure difference required by the human body. This high-speed operation mode makes this type of catheter pump produce a huge non-physiological shear force on the one hand, which will lead to more serious blood damage and complications, such as thrombosis, hemolysis, bleeding, etc.; The outflow of high-speed blood will impact the vessel wall and damage the arterial vessel. These blood and vascular injuries and complications seriously affect the therapeutic effect of VAD and the recovery of patients, and may cause irreversible damage to the patient's body.

Contents of the invention

The purpose of the present invention is to provide a novel interventional catheter pump to solve the above-mentioned problems in the prior art and reduce blood damage and blood vessel damage caused by ventricular assist devices.

To achieve the above object, the present invention provides the following scheme:

The present invention provides a novel interventional catheter pump, comprising:

Sleeve, the sleeve includes a first round pipe section, a tapered pipe section and a second round pipe section connected in sequence, the diameter of the second round pipe section is larger than the pipe diameter of the first round pipe section, and the second round pipe section A support shaft coaxial with the second circular pipe section is arranged in the middle;

a plurality of blood pumps, each of which is detachably connected to the support shaft;

All the blood pumps are connected in parallel and distributed along the circumferential direction of the support shaft, or all the blood pumps are connected in series and distributed along the axial direction of the support shaft;

When all the blood pumps are connected in parallel: a plurality of support rods are also arranged in the second circular pipe section, the first ends of the support rods are connected with the inner wall of the second circular pipe section, and the second ends of the support rods connected with the support shaft;

When all the blood pumps are connected in series: a part of the support shaft is located in the second circular pipe section, and the other part protrudes from the end of the second circular pipe section away from the tapered pipe section.

Preferably, the blood pump includes a liquid inlet pipe, a rotor, a blood pump diffuser and a motor; the pipe wall of the liquid inlet pipe is detachably connected to the support shaft; the rotor is arranged in the liquid inlet pipe The blood pump diffuser is arranged at the end of the inlet pipe away from the conical pipe section, and the blood pump diffusers in all the blood pumps are located outside the second circular pipe section; The motor is used to drive the rotor to rotate, and the motor is a waterproof motor; the rotor includes a rotor hub and rotor blades.

Preferably, the rotor hub is conical, and the tip of the rotor hub faces the tapered pipe section; and the smaller end of the rotor hub is closer to the tapered pipe section than the end of the rotor blade close to the tapered pipe section .

Preferably, the bending direction of the blood pump diffuser is opposite to the rotation direction of the rotor.

Preferably, all the blood pumps are evenly distributed, and all the support rods are evenly distributed along the circumference of the support shaft; the second circular pipe section is a straight pipe.

Preferably, the end of the support shaft close to the tapered pipe section is tapered.

Preferably, the end of the first circular tube section away from the tapered tube section is used to communicate with the patient's left ventricle, and the tapered tube section is placed in the patient's aorta during use.

Preferably, blood pump clips are provided corresponding to each of the blood pumps on the support shaft, and the blood pump clips are used to clamp the tube wall of the liquid inlet tube.

Preferably, the blood pump clips are distributed alternately with the support rods.

Compared with the prior art, the present invention has achieved the following technical effects:

The rotation speed of each blood pump in the novel interventional catheter pump of the present invention is low, which can reduce blood damage and blood vessel damage caused by the ventricular assist device.

The multiple blood pumps in the new interventional catheter pump of the present invention are connected in series or in parallel, and multiple blood pumps operate simultaneously, which can be compared with the existing VAD that only uses a single blood pump while ensuring that the VAD output flow and pressure difference remain unchanged. In comparison, the speed of each blood pump can be greatly reduced, thereby reducing the high shear force output by the blood pump, reducing the damage to the blood caused by the operation of the blood pump, improving blood compatibility and reducing complications after VAD implantation.

Since multiple blood pumps run at the same time, even if one blood pump fails or is damaged, other blood pumps can still provide life support for patients, reducing the risk of equipment failure.

Multiple blood pumps run at the same time. Since the speed of a single pump can be reduced while ensuring the same flow rate, the power requirement for a single blood pump is reduced, so each blood pump can further reduce the size of the motor, thereby reducing the size of the entire blood pump. The size facilitates the installation and placement of blood pumps and facilitates the rapid intervention of each blood pump.

When multiple blood pumps in the present invention are connected in series, they can also provide support for other organs. For example, when heart failure occurs, even with VAD assistance, it is often accompanied by renal failure. In patients with debilitating disease, the blood supply to the kidneys is guaranteed to further reduce complications; secondly, connecting multiple blood pumps in series can effectively reduce the size of the radial dimension of the second circular tube section 114, which not only does not require support rods, is low in cost, but also The size of the wound during implantation is further reduced, thereby reducing the trauma caused by implantation.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without paying creative labor.

Fig. 1 is a schematic structural view of Embodiment 1 of the novel interventional catheter pump of the present invention;

Fig. 2 is a partial structural schematic diagram of Embodiment 1 of the novel interventional catheter pump of the present invention;

Fig. 3 is a partial structural schematic diagram of Embodiment 1 of the novel interventional catheter pump of the present invention;

Fig. 4 is a partial structural schematic diagram of Embodiment 1 of the novel interventional catheter pump of the present invention;

Fig. 5 is a partial structural schematic diagram of Embodiment 1 of the novel interventional catheter pump of the present invention;

Fig. 6 is a partial structural schematic diagram of Embodiment 1 of the novel interventional catheter pump of the present invention;

Fig. 7 is a partial structural schematic diagram of Embodiment 1 of the novel interventional catheter pump of the present invention;

Fig. 8 is a partial structural schematic diagram of Embodiment 1 of the novel interventional catheter pump of the present invention;

Fig. 9 is a schematic structural view of Embodiment 1 of the new interventional catheter pump of the present invention;

Fig. 10 is a partial structural schematic diagram of Embodiment 1 of the novel interventional catheter pump of the present invention;

Fig. 11 is a partial structural schematic diagram of Embodiment 1 of the novel interventional catheter pump of the present invention;

Among them, 1. Sleeve; 111. Sleeve inlet; 112. The first round pipe section; 113. Taper pipe section; 114. The second round pipe section; 12. Support shaft; 13. Support rod; 14. Blood pump clip; 15. 2, blood pump; 21, liquid inlet pipe; 22, rotor; 221, rotor blade; 222, rotor hub; 23, blood pump diffuser; 24, motor; 25, wire.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The purpose of the present invention is to provide a novel interventional catheter pump to solve the above-mentioned problems in the prior art and reduce blood damage and blood vessel damage caused by ventricular assist devices.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Embodiment one

As shown in Figures 1 to 8, this embodiment provides a new type of interventional catheter pump, including a cannula 1 and a plurality of blood pumps 2. In this embodiment, the number of blood pumps 2 is four. In practical applications, it can The number of blood pumps 2 is adaptively adjusted according to actual needs.

Wherein, sleeve pipe 1 comprises the first round pipe section 112, the tapered pipe section 113 and the second round pipe section 114 that are connected successively, and the pipe diameter of the second round pipe section 114 is greater than the pipe diameter of the first round pipe section 112, to facilitate the second round pipe section A plurality of blood pumps 2 are installed in 114, and a support shaft 12 coaxial with the second round pipe section 114 is arranged in the second round pipe section 114; The diversion effect can also prevent the blood from directly colliding with the support shaft 12 of the casing 1 to cause blood damage; the end of the support shaft 12 away from the tapered pipe section 113 is also connected with a casing support line 15, and the casing support line 15 is used to assist in moving the tube. The novel interventional catheter of the embodiment is pumped into and out of the blood vessels of the human body.

One end of the first circular tube section 112 away from the tapered tube section 113 (i.e. the inlet of the casing 1) is used to communicate with the patient's left ventricle, a part of the first circular tube section 112 passes through the aorta, and the other part of the first circular tube section 112, the cone The tube section 113 and the second round tube section 114 are placed in the patient's aortic arch in use.

The diameter range of the first round tube section 112 is between 3mm-15mm, so that the first round tube section 112 can be inserted from the aortic valve to the left ventricle conveniently. The first circular tube segment 112 is configured in a curved shape to better conform to the shape of the aortic arch. The second round pipe section 114 is a straight pipe, and the materials of the first round pipe section, the second round pipe section 114 and the tapered pipe section 113 are the same as those used in the existing VAD catheter.

In this embodiment, a plurality of support rods 13 are also arranged in the second circular pipe section 114, the first ends of the support rods 13 are connected with the inner wall of the second circular pipe section 114, and the second ends of the support rods 13 are connected with the support shaft 12 ; All the support rods 13 are evenly distributed along the circumference of the support shaft 12 .

The blood pump 2 adopts an axial flow pump. Specifically, the blood pump 2 includes a liquid inlet pipe 21, a rotor 22, a blood pump diffuser 23 and a motor 24; the pipe wall of the liquid inlet pipe 21 is detachably connected to the support shaft 12; the rotor 22 is arranged in the liquid inlet pipe 21 The blood pump diffuser 23 is arranged at the end of the inlet pipe 21 away from the tapered pipe section 113, and the blood pump diffuser 23 in all the blood pumps 2 is located outside the second circular pipe section 114, so as to avoid the second circular pipe section 114 from The hindrance of the blood flowing out from the diffuser and the blood damage caused by the impact of this part of the blood with the second circular pipe section 114; the motor 24 is used to drive the rotor 22 to rotate, and the motor 24 is a waterproof motor 24; the rotor 22 includes a rotor hub 222 and rotor blades 221.

The rotor hub 222 is conical, and the smaller end of the rotor hub 222 is closer to the tapered pipe section 113 than the other end (that is, the tip of the rotor hub 222 faces the tapered pipe section 113); and the smaller end of the rotor hub 222 is closer to the tapered pipe section than the rotor blade 221 113 is closer to the tapered pipe section 113, so that the smaller end of the rotor hub 222 acts as a flow guide, and the smaller end of the rotor hub 222 is closer to the tapered pipe section 113 than the end of the rotor blade 221 that is closer to the tapered pipe section 113. When the length of the rotor blade 221 is constant, the delivery function of the blood pump 2 is increased, thereby reducing the speed of the blood pump 2 . The larger end of the rotor hub 222 is farther away from the tapered pipe section 113 than the end of the rotor blade 221 farther away from the tapered pipe section 113 .

The rotor blades 221 are banana-shaped blades, and the recommended number is 1-4. The banana-shaped rotor blades 221 can regulate the blood flow in the blood pump 2 and reduce blood damage caused by flow separation.

The bending direction of the blood pump diffuser 23 is opposite to the rotation direction of the rotor 22, so as to improve the pressurization effect of the blood pump diffuser 23 and reduce the influence of the pre-rotation in the blood on the subsequent arterial blood flow after being accelerated by the rotor blades 221 . At the same time, the blood pump diffuser 23 also plays the role of connecting the liquid inlet pipe 21 and the motor 24 .

In this embodiment, all the blood pumps 2 are connected in parallel and evenly distributed along the circumference of the support shaft 12, and each blood pump 2 is detachably connected to the support shaft 12; specifically, the support shaft 12 corresponds to each blood pump 2 Both are provided with a blood pump clip 14, which can be used to clamp the tube wall of the liquid inlet tube 21, so as to ensure the stability of the blood pump 2 in the spatial position. All the blood pump clips 14 are evenly distributed along the circumference of the support shaft 12 , and the blood pump clips 14 are distributed alternately with the support rods 13 to avoid the interference of the support rods 13 on the flow field of the blood pump 2 .

The wire 25 of the motor 24 of the blood pump 2 stretches out from the casing 1 and is electrically connected to the control device, and the control device can control the opening and closing and rotating speed of each blood pump 2; by adjusting the rotating speed of each blood pump 2, the total output flow and The total pressure difference satisfies the requirements; the related settings of the control device and power supply of the motor 24 are prior art, and will not be repeated in this embodiment.

The specific working process of the novel interventional catheter pump in this embodiment is as follows:

Under the suction effect of the blood pump 2, first, the blood enters from the casing inlet 111 (that is, the end of the first circular tube section 112 away from the tapered tube section 113), passes through the first circular tube section 112 and the tapered tube section 113, and reaches the supporting shaft of the casing tube 1. 12. The top of the support shaft 12 of the sleeve 1 is tapered, which has a certain flow diversion effect, and can also prevent blood from directly colliding with the support shaft 12 of the sleeve 1 to cause blood damage. Then, the blood enters the liquid inlet pipe 21 and reaches the flow area of the rotor 22 . Under the action of the rotor 22, the blood obtains velocity energy. Finally, the blood enters the blood pump diffuser 23, where the velocity energy is converted into pressure energy and then flows out. The outlet of the cannula 1 should be before the diffuser 23 of the blood pump to avoid the obstruction of the casing of the cannula 1 to the blood flowing out of the diffuser and the blood damage caused by the collision of this part of blood with the casing of the cannula 1 . The total output flow and total pressure difference of each blood pump 2 can be adjusted to meet the demand.

Embodiment two

As shown in Figures 9-11, this embodiment provides a new type of interventional catheter pump. The structure and working principle of the new type of interventional catheter pump in this embodiment are basically the same as those of the new type of interventional catheter pump in Embodiment 1. The only difference is:

In this embodiment, all the blood pumps 2 are connected in series and distributed along the axial direction of the support shaft 12 . Moreover, the support rod 13 is not provided in the second round pipe section 114 , but the support shaft 12 is fixedly connected with the second round pipe section 114 , and can also be designed as a whole, so that the support shaft 12 and the second round pipe section 114 are integrally formed. Since the blood pump 2 is distributed along the axial direction of the support shaft 12 , the blood pump clips 14 are also distributed along the axial direction of the support shaft 12 . A part of the support shaft 12 is located in the second circular pipe section 114 , and another part protrudes from an end of the second circular pipe section 114 away from the tapered pipe section 113 .

It should be noted that, in this embodiment, the blood pump diffusers 23 in all the blood pumps 2 are also located outside the second circular tube section 114, so as to avoid the second circular tube section 114 from obstructing the blood flowing out of the diffuser. And the blood damage caused by this part of blood colliding with the second circular tube section 114.

In this embodiment, connecting multiple blood pumps 2 in series can effectively reduce the size of the radial dimension of the second circular tube section 114 , not only does not require the support rod 13 , the cost is low, but also the trauma of implantation can be further reduced.

In the present invention, specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method and core idea of the present invention; meanwhile, for those of ordinary skill in the art, according to the present invention The idea of the invention will have changes in the specific implementation and scope of application. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims (9)

1. A novel interventional catheter pump, characterized in that it comprises: Sleeve, the sleeve includes a first round pipe section, a tapered pipe section and a second round pipe section connected in sequence, the diameter of the second round pipe section is larger than the pipe diameter of the first round pipe section, and the second round pipe section A support shaft coaxial with the second circular pipe section is arranged in the middle; a plurality of blood pumps, each of which is detachably connected to the support shaft; All the blood pumps are connected in parallel and distributed along the circumferential direction of the support shaft, or all the blood pumps are connected in series and distributed along the axial direction of the support shaft; When all the blood pumps are connected in parallel: a plurality of support rods are also arranged in the second circular pipe section, the first ends of the support rods are connected with the inner wall of the second circular pipe section, and the second ends of the support rods connected with the support shaft; When all the blood pumps are connected in series: a part of the support shaft is located in the second circular pipe section, and the other part protrudes from the end of the second circular pipe section away from the tapered pipe section. 2. The novel interventional catheter pump according to claim 1, characterized in that: the blood pump includes a liquid inlet pipe, a rotor, a blood pump diffuser and a motor; the pipe wall of the liquid inlet pipe and the support shaft Detachable connection; the rotor is arranged in the liquid inlet pipe; the blood pump diffuser is arranged at the end of the liquid inlet pipe away from the conical pipe section, and the blood pump in all the blood pumps The diffusers are located outside the second circular pipe section; the motor is used to drive the rotor to rotate, and the motor is a waterproof motor; the rotor includes a rotor hub and rotor blades. 3. The novel interventional catheter pump according to claim 2, characterized in that: the rotor hub is conical, and the tip of the rotor hub faces the tapered pipe section; and the smaller end of the rotor hub is smaller than the end of the rotor hub. The end of the rotor blade close to the tapered pipe section is closer to the tapered pipe section. 4. The novel interventional catheter pump according to claim 2, characterized in that: the bending direction of the blood pump diffuser is opposite to the rotation direction of the rotor. 5. The novel interventional catheter pump according to claim 1, characterized in that: all the blood pumps are evenly distributed, all the support rods are evenly distributed along the circumference of the support shaft; the second circular tube section is straight Tube. 6. The novel interventional catheter pump according to claim 1, characterized in that: the end of the support shaft close to the tapered tube section is tapered. 7. The new interventional catheter pump according to claim 1, characterized in that: the end of the first circular tube section away from the tapered tube section is used to communicate with the left ventricle of the patient, and the tapered tube section is placed on the patient's left ventricle during use. in the aorta. 8. The new interventional catheter pump according to claim 2, characterized in that: blood pump clips are provided corresponding to each of the blood pumps on the support shaft, and the blood pump clips are used to clamp the inlet liquid tube wall. 9. The novel interventional catheter pump according to claim 8, characterized in that: the blood pump clips are distributed alternately with the support rods.

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