A physiological blood pump head with blood flow self-spinning

Abstract

The present invention discloses a physiological blood pump head with self-spinning blood flow, and relates to the field of biomedical engineering. The blood pump head includes a blood swirling chamber and an energy storage chamber; the blood swirling chamber is connected to the aorta via an arterial swirling blood flow connecting tube, and a pump housing is provided outside the blood swirling chamber; a swirling flow guide structure is provided inside the pump housing and between the pump housing and the arterial swirling blood flow connecting tube; the blood swirling chamber and the energy storage chamber are separated by a swirling force generator, and each is sealed with the swirling force generator; the energy storage chamber is connected to an external driver via a driving connecting tube, and an energy storage chamber housing is provided outside the energy storage chamber. The present invention is mainly used to help patients with acute heart function damage improve the heart pump function, overcome the shortcomings that the blood flow generated by the existing external heart unloading and myocardial perfusion device is different from the body's own swirling blood flow, realize the physiological swirling blood flow in the blood swirling chamber and the arterial swirling blood flow connecting tube, reduce the degree of blood damage and the risk of thrombosis, and improve physiological compatibility.

Description

Technical Field

[0001] The invention belongs to the field of biomedical engineering and relates to a physiological blood pump head with blood flow self-spinning, which is mainly used to help patients with acute heart function damage improve heart pump function. Background Art

[0002] Unloading the heart afterload and increasing myocardial blood perfusion in patients with acute cardiac function damage are key means of clinically saving patients' lives and protecting their cardiac function. The pump head can convert external electrical and mechanical energy into blood kinetic energy and potential energy, and is the core component for completing cardiac afterload unloading and improving myocardial blood perfusion. At present, two types of devices are mainly used in clinical practice, namely, intravascular balloon counterpulsation device (IABP) and extracorporeal aortic counterpulsation device. The intravascular balloon counterpulsation device is limited by the size of the blood vessel, so the flow rate is small, and the cardiac afterload unloading and myocardial perfusion capacity it can produce are limited. In addition, when the balloon moves in the descending aorta, it will produce a large stress shock and vibration on the vascular wall, damage the vascular wall structure, and cause subsequent vascular wall lesions. The extracorporeal aortic counterpulsation device places the pump head outside the body and connects it to the aorta through an artificial blood vessel. This type of device solves the problem of small IABP flow in the design, but does not optimize the hemodynamic environment of the blood flow field in the pump housing. Therefore, there are obvious flow dead zones and flow separation phenomena during operation, thereby increasing the risk of blood damage and thrombosis.

[0003] The magnetically driven separated internal pulsating blood pumping ventricular blood pump described in patent CN 114367029 A is characterized by pulsating blood pumping and has no structure capable of generating swirling blood flow. Summary of the invention

[0004] In order to solve the deficiencies of the prior art, the present invention proposes a physiological blood pump head with blood flow self-spinning.

[0005] The pump head of the physiological blood pump adopts an extracorporeal working mode to generate a swirling blood flow that is the same as the blood flow pattern in the human artery, and solves the problems of cardiac afterload unloading and insufficient myocardial blood perfusion capacity as well as damage to the blood vessel wall during operation existing in traditional intravascular balloon counterpulsation. A swirling structure is introduced into the structural design of the pump head of the physiological blood pump, so that the blood forms a stable swirling blood flow field in the pump casing, and the degree of blood flushing on the pump casing is increased, thereby completely eliminating flow dead zones and flow separation, reducing the risk of blood damage and thrombosis, and effectively improving physiological compatibility.

[0006] In order to achieve the above object, a technical solution adopted by the present invention is:

[0007] Provided is a physiological blood pump head with self-spinning blood flow, comprising a blood swirling chamber and an energy storage chamber; wherein the blood swirling chamber is connected to the aorta through an arterial swirling blood flow connecting tube, a pump housing is arranged outside the blood swirling chamber, and a swirling flow guide structure is arranged inside the pump housing and between the pump housing and the arterial swirling blood flow connecting tube; the blood swirling chamber and the energy storage chamber are separated by a swirling force generator, and each is sealed with the swirling force generator; the energy storage chamber is connected to an external driver through a driving connecting tube, and an energy storage chamber housing is arranged outside the energy storage chamber.

[0008] Preferably, the pump housing is a hemispherical or conical curved surface with no dead angles, and there is a swirling guide structure inside it. The swirling guide structure includes but is not limited to guide shapes such as spiral guide grooves and swirling guide blades, which are beneficial to guiding the blood to flow according to the internal guide shape, so that the blood inside the blood swirling cavity produces swirling blood flow; when the number of guide structures is greater than or equal to 1, the spiral angle between the spiral guide groove or the swirling guide blade and the axis of the physiological blood pump head is between -80° and +80°.

[0009] Preferably, the swirling blood flow connecting tube is located at the top of the pump housing, and there is a swirling guide structure in the arterial swirling blood flow connecting tube. The swirling guide structure includes but is not limited to guide shapes such as spiral guide grooves and swirling guide blades, which are beneficial to guiding the blood to flow according to the internal guide shape; so that swirling blood flow is generated inside the arterial swirling blood flow connecting tube; when the number of guide structures is greater than or equal to 1, the spiral angle between the spiral guide groove or the swirling guide blade and the axis of the physiological blood pump head is between -60° and +60°.

[0010] Preferably, the pump head of the physiological blood pump connects the blood swirling chamber to the aorta via an arterial swirling blood flow connecting tube; and connects the energy storage chamber to an external driver via a driving connecting tube. The driver periodically pumps fluid into and out of the energy storage chamber, and the fluid pumped into the energy storage chamber by the driving connecting tube drives the swirling force generator in a swirling manner, so that the swirling force generator swings as a whole in the center of the energy storage chamber while rotating around the center. This rotation works together with other swirling structures to form an overall swirling flow in the swirling chamber; so as to drive the swirling force generator to swing back and forth between the blood swirling chamber and the energy storage chamber, so as to achieve the goal of periodically sucking blood into and pumping blood out of the blood swirling chamber, thereby achieving the goal of reducing cardiac afterload and improving myocardial perfusion. When blood is sucked into the blood swirl chamber, the swirl guide vane at the top of the pump housing changes the flow direction of blood in the arterial swirl blood flow connecting tube, causing the blood to generate initial swirl along the axis direction of the arterial swirl blood flow connecting tube; thereafter, the blood flows along the spiral guide groove in the pump housing, increasing the swirl intensity of the blood, and during the flow, the blood rotates and flushes the entire pump housing and the swirl force generator, thereby eliminating the flow dead zone and flow separation area in the blood swirl chamber. When the blood is pumped out of the blood swirl chamber by the swirl force generator, the blood first generates initial swirl through the spiral guide groove in the pump housing, and increases the flushing of the pump housing; when the blood flows through the swirl guide vane, the swirl guide vane adjusts the swirl degree and swirl direction of the blood flow, increasing the flushing of the blood on the arterial swirl blood flow connecting tube.

[0011] The beneficial effects of the present invention are: compared with the intravascular balloon counterpulsation device, the present invention can significantly increase the volume of the physiological blood pump head, thereby producing a stronger cardiac afterload unloading and myocardial blood perfusion effect; at the same time, it avoids the adverse effects of the traditional intravascular balloon counterpulsation device on the blood vessel wall during use. Compared with the traditional extracorporeal aortic counterpulsation device, the present invention introduces the swirling blood flow effect into the design of the physiological blood pump head during the design process, and by adding spiral guide grooves and swirling guide blades, the blood generates swirling blood flow in the pump housing, increasing the flushing of the pump housing, and solving the blood damage and thrombosis risks of the traditional extracorporeal aortic counterpulsation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of a physiological blood pump head with blood flow self-spinning provided by the present invention

[0013] Numbers in the figure: 1, blood swirling chamber; 2, energy storage chamber; 3, swirling force generator; 4, energy storage chamber housing; 5, pump housing; 6, arterial swirling blood flow connecting pipe; 7, drive connecting pipe; 8, spiral guide groove; 9, swirling guide blade DETAILED DESCRIPTION

[0014] like Figure 1As shown, a physiological blood pump head with blood flow self-spinning provided by the present invention comprises a blood swirling chamber (1) and an energy storage chamber (2); wherein the blood swirling chamber (1) is connected to the aorta through an arterial swirling blood flow connecting tube (6); a pump housing (5) is provided outside the blood swirling chamber (1); a swirling flow guide structure is provided inside the pump housing (5) and between the pump housing (5) and the arterial swirling blood flow connecting tube (6); the blood swirling chamber (1) and the energy storage chamber (2) are separated by a swirling force generator and are respectively sealed from the swirling force generator; the energy storage chamber (2) is connected to an external driver through a driving connecting tube (7); an energy storage chamber housing (4) is provided outside the energy storage chamber (2).

[0015] The pump head of the physiological blood pump has a capacity of 60 mL, the pump housing (5) and the energy storage chamber housing (4) are made of polytetrafluoroethylene material, and the vortex force generator (3) is made of bovine pericardium material; four spiral guide grooves are processed on the pump housing (5), the spiral guide grooves have a width of 5 mm, a depth of 2 mm, and a spiral angle of 45°; the number of vortex guide blades is 4, and the spiral angle is 45°.

[0016] During operation, the blood swirling chamber (1) is connected to the patient's aorta through the arterial swirling blood flow connecting tube (6), and the energy storage chamber (2) is connected to the external driver through the driving connecting tube (7); the driver periodically pumps fluid into and out of the energy storage chamber (2), and the fluid pumped into the energy storage chamber (2) by the driving connecting tube (7) drives the swirling force generator (3) in a swirling manner, so that the swirling force generator swings as a whole in the center of the energy storage chamber while rotating around the center. This rotation and other swirling structures work together to form an overall swirling flow in the swirling chamber; so as to drive the swirling force generator (3) to swing back and forth between the blood swirling chamber (1) and the energy storage chamber (2), so as to achieve the goal of periodically sucking blood into and pumping blood out of the blood swirling chamber (1), thereby achieving the goal of reducing cardiac afterload and improving myocardial perfusion.

[0017] After experimental verification, the physiological blood pump head can achieve stable counterpulsation with the patient's heart, with a counterpulsation frequency of 60 times / minute and a counterpulsation volume of 60mL. The experimental results show that the use of the physiological blood pump head can reduce the heart afterload by 50% and increase the diastolic coronary blood flow by 40%, achieving the design goal.

Claims

1. A physiological blood pump head with blood flow self-spinning, characterized in that: The pump head of the physiological blood pump comprises two parts, namely a blood swirling chamber (1) and an energy storage chamber (2); wherein the blood swirling chamber (1) is connected to the aorta via an arterial swirling blood flow connecting tube (6); a pump housing (5) is arranged outside the blood swirling chamber (1); a swirling flow guiding structure is arranged inside the pump housing (5) and between the pump housing (5) and the arterial swirling blood flow connecting tube (6); the blood swirling chamber (1) and the energy storage chamber (2) are separated by a swirling force generator (3), and each is sealed from the swirling force generator (3); the energy storage chamber (2) is connected to an external driver via a driving connecting tube (7); an energy storage chamber housing (4) is arranged outside the energy storage chamber (2); the pump housing (5) is a curved surface shape without dead angles, and a swirling flow guiding structure is arranged inside the pump housing (5); the swirling flow guiding structure comprises a spiral flow guiding groove (8) and a swirling flow guiding groove (9); The guide blade (9) has a guide shape so as to generate a swirling blood flow in the blood inside the blood swirling chamber (1); when the number of the guide structures is greater than or equal to 1, the spiral angle between the spiral guide groove (8) or the swirling guide blade (9) and the axis of the pump head of the physiological blood pump is between -80° and +80°; the arterial swirling blood flow connecting tube (6) is located at the top of the pump housing (5); the external driver periodically pumps fluid into and out of the energy storage chamber (2) to drive the swirling force generator (3) to swing back and forth between the blood swirling chamber (1) and the energy storage chamber (2), thereby achieving the periodic suction and pumping of blood into and out of the blood swirling chamber (1), adjusting the swing distance per beat according to the beat output requirement, so as to match the beat output of the pump head, thereby achieving the goal of helping patients with acute heart function damage to improve the heart pump function.

Images