Anti-displacement structure for intra-aortic circulatory assist pump

Abstract

The application discloses a displacement preventing structure for an intra-aortic circulation assisting pump, which comprises a supporting part and a pump body part, the supporting part is provided with a first holding part at its end, the first holding part is provided with a plurality of mounting feet, the ends of the plurality of mounting feet are respectively formed with protrusions protruding from the main bodies of the mounting feet; the pump body part is provided with a second holding part at its end, the second holding part is provided with a plurality of mounting grooves corresponding to the mounting feet and an annular groove, the annular groove is adjacent to and communicated with the plurality of mounting grooves; the protrusions of the mounting feet enter the groove through the mounting grooves in an interference fit mode and are connected with the groove in a clearance fit mode; in this state, the first holding part of the supporting part is connected with the second holding part of the pump body part and can freely rotate with each other. The application can effectively solve the displacement or rotation problem between the device and the aorta caused by the torsion of the power line when the intra-aortic circulation pump runs at a fixed position.

Description

Technical Field

[0001] This invention relates to an anti-displacement structure for an aortic internal circulation auxiliary pump, belonging to the technical field of ventricular assist devices for medical devices. Background Technology

[0002] The intra-aortic circulation assist device is a type of temporary ventricular assist device. This device is characterized by being implanted into the patient's body through interventional means. The device is installed in the aorta and works. It is an important means of minimally invasive treatment for acute heart failure and postoperative low cardiac output. With the temporary assistance of this device, patients can get through the dangerous period of acute heart failure. After the dangerous period, the device is removed from the patient's body, and the patient can return to normal life.

[0003] When working, the aortic internal circulation assist device needs to be fixed in a designated position inside the aorta, which inevitably involves contact and mutual force with the inner wall of the aorta. When such a device is working in the body, it must be connected to an external power source and controller through a motor power cord. The twisting of the power cord inside the aorta is unavoidable. This means that the fixing device must bear the torsional force brought by the power cord, which will cause the device to shift or rotate, thereby damaging the aortic intima.

[0004] Based on this, the present invention provides an anti-displacement structure for an aortic internal circulation assist pump to reduce the incidence of adverse events of the aortic internal circulation assist device, such as reducing damage and infection of the aortic intima, so that patients can receive safer and more effective mechanical circulatory support. Summary of the Invention

[0005] The purpose of this invention is to provide an anti-displacement structure for an aortic internal circulation auxiliary pump, so as to solve the problem of displacement or rotation between the device and the aorta caused by the torsion of the power line when the current aortic internal circulation auxiliary device is running in the aorta, thereby solving the problem of aortic intima damage caused by this.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An anti-displacement structure for an aortic internal circulation auxiliary pump includes a support component and a pump body component. The support component has a first retaining portion disposed at its end, the first retaining portion having a plurality of mounting feet, the ends of the plurality of mounting feet each having a protrusion protruding from the mounting foot body.

[0008] The pump body component has a second retaining portion disposed at its end, the second retaining portion having a plurality of mounting grooves corresponding to the mounting feet and an annular groove, the annular groove being adjacent to and communicating with the plurality of mounting grooves;

[0009] The protrusion of the mounting foot enters the groove through the mounting slot with an interference fit and is connected to the groove with a clearance fit. In this state, the first retaining part of the support member is connected to the second retaining part of the pump body member, and the clearance fit between the protrusion and the groove allows the first retaining part and the second retaining part to rotate freely.

[0010] Preferably, the protrusion protrudes from the main body of the mounting foot toward the groove by an amount greater than the depth of the groove.

[0011] Preferably, the mounting groove has the same depth as the annular groove.

[0012] Preferably, both the first retaining portion and the second retaining portion are cylindrical in shape, the mounting feet are symmetrically distributed on the first retaining portion, and the mounting grooves are symmetrically distributed on the second retaining portion.

[0013] Preferably, the number of mounting feet and mounting slots are two or more, and more preferably four.

[0014] Preferably, the supporting component also has multiple legs and a folded mesh, with the multiple legs disposed at the edge of the folded mesh. The folded mesh has two states: folded and open. The folded mesh is integrally formed with the first retaining part.

[0015] Preferably, the pump body component includes a casing and a rotor impeller, the second retaining part is located at the front end of the casing, the rotor impeller is installed inside the casing and there is a gap between it and the casing; the pump body component is connected to a micro motor located at the rear end of the casing via a mechanical shaft, and the rotation of the motor drives the impeller to rotate.

[0016] The beneficial effects of this invention are:

[0017] The anti-displacement structure for an aortic internal circulation assist pump provided by this invention allows the support component and pump body component to rotate freely. The torsional force of the motor power cable and delivery catheter connected to the pump body component is not transmitted to the support component, thus relieving it of torsional stress. This effectively solves the problem of displacement or rotation between the aorta and the internal circulation assist device caused by the torsion of the power cable when operating in the predetermined working position. Simultaneously, this anti-displacement structure prevents the support device from detaching, avoiding detachment accidents during implantation and removal. Therefore, it prevents the device from shifting out of the predetermined working position and reduces the risk of the prongs shifting and scratching the inner wall of the aorta. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the anti-displacement structure of the present invention.

[0019] Figure 2This is a schematic diagram of the support component in the anti-displacement structure of the present invention.

[0020] Figure 3 This is a schematic diagram of the structure of the second retaining part of the pump body component in the anti-displacement structure of the present invention.

[0021] Figure label:

[0022] 1. Support component; 11. First retaining part; 12. Mounting foot; 13. Protrusion; 14. Folded mesh;

[0023] 15 Mounting foot body; 16 Support foot; 2 Pump body component; 21 Second retaining part; 22 Mounting groove;

[0024] 23. Groove; 24. Casing. Detailed Implementation

[0025] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but the present invention is not limited to the following content.

[0026] Figure 1 This is a schematic diagram of the anti-displacement structure for an aortic internal circulation auxiliary pump according to the present invention. The anti-displacement structure includes a support component 1 and a pump body component 2. The support component 1 and the pump body component 2 are separate structures, connected by a clearance fit, allowing them to rotate freely. Specifically, as... Figure 2 As shown, the support member 1 has a first retaining portion 11 disposed at its end, the first retaining portion 11 having a plurality of mounting feet 12, the ends of the plurality of mounting feet 12 respectively forming protrusions 13 protruding from the mounting foot body; as Figure 3 As shown, the pump body component 2 has a second retaining portion 21 disposed at its end. The second retaining portion 21 has a plurality of mounting grooves 22 corresponding to a plurality of mounting feet and an annular groove 23. The annular groove 23 is adjacent to and communicates with the plurality of mounting grooves 21. The protrusion 13 of the mounting foot 12 passes through the mounting groove 22 and enters the groove 23 in an interference fit manner, and is connected to the groove 23 in a clearance fit manner. In this state, the first retaining portion 11 of the support component 1 is connected to the second retaining portion 21 of the pump body component 2. The clearance fit between the protrusion 13 and the groove 23 allows the first retaining portion 11 and the second retaining portion 21 to rotate freely.

[0027] In one specific embodiment of the present invention, both the first retaining part 11 and the second retaining part 12 are cylindrical in shape. Multiple mounting feet 12 are symmetrically distributed on the first retaining part 11, and multiple mounting grooves 22 are symmetrically distributed on the second retaining part 21. The number of mounting feet and mounting grooves is two or more, for example, two, three, or four; the figure shows four. During installation, the protrusion 13 on the mounting foot 12 first undergoes an interference fit with its corresponding mounting groove 22, meaning the size of the protrusion 13 is larger than the size of the mounting groove 22. The protrusion 13 needs to pass through the mounting groove 22 using methods such as press-fitting. After the protrusion 13 passes through the mounting groove 22 and enters the recess 23, a clearance fit is formed between the protrusion 13 and the recess 22. In this embodiment, the protrusion 13 is designed to protrude from the main body of the mounting foot 12 toward the recess 23 by an amount greater than the depth of the recess 23. When the protrusion 13 enters the recess 23, the main body of the mounting foot 12 is separated from the sidewalls on both sides of the mounting groove 22, thus not affecting the free rotation of the protrusion 13 along the recess 23. In addition, the depths of the mounting groove 22 and the recess 23 can be the same or different. For example, the depth of the recess can be greater than the depth of the mounting groove. As long as the amount of the protrusion is greater than the depth of the recess, the free rotation of the protrusion in the recess can be guaranteed.

[0028] As a specific embodiment of the present invention, such as Figure 2 As shown, the support component, in addition to the first retaining part, also has multiple legs 16 and a folded mesh 14. The multiple legs 16 are located at the edges of the folded mesh 14 for mounting the circulation auxiliary pump in a predetermined position. The folded mesh 14 has two states: folded and open. It is folded during implantation and open upon reaching the target position. The folded mesh 14 is integrally formed with the first retaining part 11. The legs and the folded mesh are made of biocompatible superelastic alloy or shape memory alloy; the first retaining part can be made of biocompatible titanium alloy or 316L stainless steel, etc. Figure 1 As shown, the pump body component 2 includes a casing 24 and a rotor impeller (not shown in the figure). The second retaining part 21 is located at the front end of the casing, and the rotor impeller is installed inside the casing with a gap between it and the casing. The pump body component is connected to a micro motor (not shown in the figure) located at the rear end of the casing via a mechanical shaft. The rotation of the motor drives the impeller to rotate. The pump body component can be made of biocompatible materials such as titanium alloy or 316L stainless steel.

[0029] In the anti-displacement structure of the aortic internal circulation auxiliary pump of the present invention, the support component and the pump body component adopt a separate structure and can rotate relative to each other. This prevents the torsional force from being transmitted to the support component when the pump body component is torsionally subjected to components such as the power cord, thus keeping the support component in its predetermined installation position and preventing displacement that could scratch the aortic intima. Specifically, the protrusion on the mounting foot and the groove on the pump body component are in clearance fit. The movement of the protrusion on the mounting foot is constrained by the groove on the pump body component, allowing it to rotate freely within the groove. This allows the pump body component to rotate under the torsional force of the motor power cord and delivery catheter, while the support component remains stationary without bearing any torsional force, preventing displacement or rotation of the support component and reducing the risk of displacement of the support foot and scratching the aortic inner wall. During use, the risk of detachment of the circulating auxiliary pump with this anti-displacement structure only exists when the mounting foot and mounting groove are in the mounting phase (the position where the protrusion and the mounting groove are aligned). However, since the protrusion of the mounting foot and the mounting groove are interference-fitted, a large assembly force is required to cause detachment. This prevents the mounting foot from sliding out of the mounting groove when the two are rotated to the mounting phase, preventing the pump body parts from falling off and preventing the support parts from falling off during disassembly, thus preventing the pump from being unable to be removed from the body.

Claims

1. A displacement prevention structure for an aortic internal circulation auxiliary pump, characterized in that, The anti-displacement structure includes a support component and a pump body component. The support component has a first retaining portion disposed at its end. The first retaining portion has a plurality of mounting feet, and the ends of the plurality of mounting feet are respectively formed with protrusions protruding from the mounting foot body. The pump body component has a second retaining portion disposed at its end, the second retaining portion having a plurality of mounting grooves corresponding to the mounting feet and an annular groove, the annular groove being adjacent to and communicating with the plurality of mounting grooves; The pump body component includes a casing and a rotor impeller. The second retaining part is located at the front end of the casing, and the rotor impeller is installed inside the casing with a gap between it and the casing. The pump body component is connected to a micro motor located at the rear end of the casing via a mechanical shaft. The rotation of the motor drives the impeller to rotate. The protrusion protrudes from the main body of the mounting foot toward the groove by an amount greater than the depth of the groove; The protrusion of the mounting foot enters the groove through the mounting slot with an interference fit and is connected to the groove with a clearance fit. In the state of connection described above, the first holding part of the support member is connected to the second holding part of the pump body member, and the clearance fit between the protrusion and the groove allows the first holding part and the second holding part to rotate freely. The pump body component rotates with the torsional force of the motor power line and the delivery conduit, but the support component does not bear the torsional force and remains stationary.

2. The anti-displacement structure for an aortic internal circulation auxiliary pump according to claim 1, characterized in that, The mounting slot and the groove have the same depth.

3. The anti-displacement structure for an aortic internal circulation auxiliary pump according to claim 1, characterized in that, Both the first retaining part and the second retaining part are cylindrical in shape. The mounting feet are symmetrically distributed on the first retaining part, and the mounting grooves are symmetrically distributed on the second retaining part.

4. The anti-displacement structure for an aortic internal circulation auxiliary pump according to claim 3, characterized in that, The number of mounting feet and mounting slots are both two or more.

5. The anti-displacement structure for an aortic internal circulation auxiliary pump according to claim 1, characterized in that, The supporting component also has multiple legs and a folded mesh. The multiple legs are arranged on the edge of the folded mesh, which has two states: folded and open. The folded mesh is integrally formed with the first retaining part.

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