CN219921849U - Blood inflow cage and catheter pump thereof - Google Patents

Abstract

The utility model aims to accurately determine the position in a body and provides a blood inflow cage with a simple processing technology and a catheter pump thereof, the blood inflow cage comprises a circular tubular main body part, a blood inflow port is formed in the peripheral wall of the main body part, a water drop head is connected to the far end of the main body part, the far end of the water drop head is a conical column section, a developing mark is arranged on the conical column section, the water drop head is made of a single metal material, the processing technology is simple, the developing mark is arranged on the water drop head, the processing technology is convenient to realize on one hand, and on the other hand, the blood inflow cage is closer to the far end relative to a sleeve, and the intervention position of the whole catheter pump can be determined more accurately under the guidance of ultrasonic equipment and fluoroscopy equipment.

Description

Blood inflow cage and catheter pump thereof

Technical Field

The utility model relates to the technical field of ventricular assist pumping, in particular to a blood inflow cage and a catheter pump thereof.

Background

Catheter pumps, as one of the ventricular assist devices, may be introduced percutaneously into the heart and may be configured to assist or replace the natural heart pump function by circulatory pumping or continuous pumping of blood, providing hemodynamic support for cardiogenic shock and acute heart failure. The tube pump includes a guide tube, a motor, an impeller, a sleeve, a pigtail, a blood inflow port, a blood outflow port, and the like, which are connected to an external support device. When in use, the pigtail and part of the sleeve pipe with the blood inflow port extend into the left ventricle, the blood outflow port, the motor and other parts are positioned in the main pulse tube, and the motor works to drive the impeller to rotate so as to convey the blood in the left ventricle into the main pulse tube.

Because the vascular pipeline in the human body is tortuous, and the catheter is retrograde to enter the left atrium through two turns of the aortic valve and the mitral valve, the operation is often difficult, so the interventional operation through the catheter needs to be performed under the guidance of ultrasonic equipment and fluoroscopic equipment, and the correct position of the catheter pump is acquired through the images of the ultrasonic equipment and the fluoroscopic equipment outside the body. It is particularly important to accurately determine the position of the catheter pump in the body, and slight deviations can cause secondary injury to the patient.

The most common practice in the art is to place a radiopaque polymer band (e.g., tungsten loaded PU) over the cannula and place a heat shrink tube (e.g., fluorinated Ethylene Propylene (FEP) or Polytetrafluoroethylene (PTFE)) around the band to improve visibility and aid in accurate positioning of the device. It is known that in order to reduce damage to heart valves, the sleeve is required to be relatively flexible, but if it is of a very flexible material, this results in lack of support which is detrimental to percutaneous insertion of the catheter pump, and when the flexible sleeve is connected to a blood inflow cage and a blood outflow cage of metallic material, the sleeve itself or the connection is required to have a certain support strength and the support strength requirements vary from place to place due to the possibility of being subjected to large torsional and tensile forces. Based on the above factors, the sleeve itself is relatively high in terms of both material selection and tooling, which undoubtedly increases the process requirements of the sleeve, making the process more difficult if a radiopaque polymer band is again provided on the sleeve.

Disclosure of Invention

An object of the present utility model is to enable accurate determination of the position in the body and to provide a blood inflow cage with a simple processing process.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: the blood inflow cage comprises a circular tubular main body part, wherein a blood inflow opening is formed in the peripheral wall of the main body part, a water drop head is connected to the far end of the main body part, the far end of the water drop head is a conical column section, and a developing mark is arranged on the conical column section.

The outer periphery of the conical column section is provided with an annular groove, the developing mark is of an annular structure, the developing mark is embedded in the annular groove to form fixed connection, and the outer wall of the developing mark is a conical surface which is flush with and extends along the outline of the outer wall of the conical column section.

The outer wall of the conical column section is provided with a plurality of concave parts at intervals along the circumferential direction, a plurality of developing marks are embedded in the concave parts to form fixed connection, and the outer wall of the developing mark is a conical surface which is flush and forward with the outline of the outer wall of the conical column section.

The developing mark is of an annular structure, the inner wall of the developing mark is adhered to the periphery of the conical column section through glue, and the periphery of the developing mark is an arc surface and is in smooth transition with the conical column section at the joint.

The surface of the developing mark at the mating position with the annular groove/recess is a rough surface.

The proximal end of the cone column section is integrally connected with a hemispherical body, the distal ends of support columns on two sides of a blood inflow opening on the main body are abutted against and welded with the outer wall of the hemispherical body, the distal ends of the cone column section extend to form a connecting section, the hemispherical body of the cone column section, the connecting section and the main body are coaxially arranged, and through holes penetrating through the two ends are formed in the centers of the cone column section, the hemispherical body and the connecting section.

Another object of the present utility model is a catheter pump that can accurately determine the location in the body and that is simple to manufacture.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: a catheter pump comprises the blood inflow cage, a proximal end of a motor is connected with a catheter, an impeller is coaxially connected with a distal end of the motor, a blood outflow cage is arranged on the periphery of the impeller in a covering mode, the distal end of the blood outflow cage is fixed with the proximal end of a main body of the blood inflow cage through a sleeve, and a tail pipe is further connected to the distal end of a connecting section of the blood inflow cage.

The pigtail is provided with an electric sensor and a temperature sensor.

The pigtail comprises a straight section and a bending section, the rigidity of the straight section is larger than that of the bending section, and the electric sensor and the temperature sensor are both arranged on the bending section.

In the scheme, the water drop head is made of a single metal material, the processing technology is simple, the developing mark is arranged on the water drop head, on one hand, the processing technology is convenient to realize, on the other hand, compared with the sleeve, the blood inflow cage is closer to the far end, and the intervention position of the whole catheter pump can be more accurately determined under the guidance of ultrasonic equipment and fluoroscopy equipment.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a catheter pump;

FIG. 2 is a schematic view showing the structure of a blood inflow cage in example 1;

FIG. 3 is a schematic view showing the structure of a blood inflow cage in example 2;

FIG. 4 is a cross-sectional view of FIG. 2 or FIG. 3;

FIG. 5 is a cross-sectional view of the blood inflow cage of example 3;

FIG. 6 is a cross-sectional view of the blood inflow cage of example 4;

fig. 7 is a schematic structural view of a pigtail.

Detailed Description

For ease of understanding, we first define the orientations referred to hereinafter: "proximal", "proximal" refers to the side proximal to the operator/physician and "distal" refers to the side distal to the operator/physician, i.e., the side proximal to the heart, as discussed in further detail below in connection with fig. 1-7.

The blood inflow cage comprises a tubular main body part 11, wherein a blood inflow port 111 is formed in the peripheral wall of the main body part 11, a water dropper 12 is connected to the far end of the main body part 11, a conical column section 121 is arranged at the far end of the water dropper 12, and a developing mark 20 is arranged on the conical column section 121. Generally, the body 11 and the water dropper 12 are formed separately and then welded together to form the blood inflow cage 10. In the case of the water droplet 12, which is made of a single metal material, the processing technology is simple, the surface of the water droplet 12 is smooth, and has a certain length and thickness, the developing mark 20 is arranged on the water droplet 12, so that the processing technology is convenient to realize on one hand, and on the other hand, the blood flows into the cage 10 to be closer to the far end relative to the sleeve 70, and the intervention position of the far end of the whole catheter pump can be reflected more accurately under the guidance of an ultrasonic device and/or a fluoroscopy device.

Example 1

As a preferred embodiment of the present utility model, as shown in fig. 2, the outer circumference of the tapered column section 121 is provided with an annular groove 121a, and the developing mark 20 has an annular structure and may be made of stainless steel or platinum-iridium, or may include stainless steel or platinum-iridium. The developing mark 20 is embedded in the annular groove 121a to form fixed connection, and the outer wall of the developing mark 20 is a conical surface which is flush and forward with the outline of the outer wall of the conical column section 121. In this embodiment, the developing mark 20 is directly inlaid on the tapered column section 121 of the water dropper 12, and the fixing connection can be realized through a structure arranged between the developing mark and the tapered column section, or the inlaid fixing can be realized through an adhesive mode, and the developing mark and the tapered column section are preferably fixedly connected through the adhesive mode, so that a gap exists between the developing mark and the tapered column section, and blood enters the gap to form thrombus. Similarly, to avoid thrombus formation, the outer wall of the developing mark 20 is flush with the outline of the outer wall of the tapered column section 121, and the developing mark 20 and the tapered column section 121 are smoothly transited from the surface, and are seemingly integrated, thereby improving the appearance.

Example 2

Fig. 3 shows another preferred embodiment of the present utility model, the outer wall of the tapered column section 121 is provided with a plurality of concave portions 121b at intervals along the circumferential direction thereof, a plurality of developing marks 20 are embedded in the concave portions 121b to form a fixed connection, and the outer wall of the developing mark 20 is a tapered surface which is flush with and parallel to the contour of the outer wall of the tapered column section 121. In this structure, the developing marks 20 are not continuous annular structures, but are small-segment structures arranged at intervals one by one.

Example 3

Referring to fig. 5, the developing mark 20 has a ring structure, the inner wall of the developing mark 20 is adhered to the outer circumference of the tapered column section 121 by glue, and the outer circumference of the developing mark 20 is an arc surface and smoothly transits with the tapered column section 121 at the joint. The developing mark 20 is directly glued on the periphery of the tapered section 121, so that the original structure of the water droplet 12 is not required to be changed, and the original structure of the mold is also adopted, but the problem of hemolysis is considered, so that the periphery of the developing mark 20 is in an arc surface and smoothly transits with the tapered section 121 at the connecting position.

Example 4

At present, most interventional operations need to use radioactive rays and contrast agents to develop and mark the position of an interventional body, so that the operation is convenient, but larger radiation exists, ionization and excitation reactions of human macromolecules and water molecules are caused, harmful effects are generated, the human body can be damaged by the radioactive rays after long-time exposure, and the risk of allergy and renal failure exists when the contrast agents are used.

We will make the surface of the developing mark 20 at the mating position with the annular groove 121 a/recess 121b rough as shown in fig. 6. The ultrasonic imaging equipment and the working principle are as follows: the ultrasonic wave generator and the receiver are integrated, one part of ultrasonic waves penetrate into the interface between two materials with different acoustic impedances and the other part of ultrasonic waves are reflected, the receiver receives reflected wave imaging, namely the stronger the reflected wave is, the better the ultrasonic imaging effect is, when the ultrasonic waves propagate from a medium with small acoustic impedance to a medium with large acoustic impedance, the ultrasonic waves are reflected at the interface between the two materials, and the higher the acoustic impedance is, the stronger the reflecting capacity of the substance is. Therefore, the larger the area of the reflective interface of the surgical instrument, the higher the acoustic impedance of the surface material and the better the effect of ultrasound visualization. The reflecting bulges are used for reflecting and refracting the sound waves for a plurality of times when the sound waves enter or leave the developing cavity so as to reduce the intensity of the sound waves; therefore, the rough surface increases the area of the reflecting interface and improves the effect of ultrasonic development. The method is better suitable for the single-use ultrasonic development scene, or the single-use fluorescent development scene or the development scene combining the single-use ultrasonic development scene and the fluorescent development scene, and compared with the prior art, the method can reduce the requirement of the operation on auxiliary equipment, simplify the operation flow and reduce the operation risk. The ultrasonic development has good effect, can further reduce the use of radioactive rays and contrast agents, reduces the damage to human bodies, and meanwhile, the rough surface can also improve the connection strength between the development mark 20 and the annular groove 121 a/concave part 121b, so that the development mark 20 is prevented from falling off due to blood impact.

Further, the proximal end of the tapered column section 121 is integrally connected with a hemispherical body 122, the distal ends of the support columns 112 on two sides of the blood inflow opening 111 on the main body 11 are abutted against and welded with the outer wall of the hemispherical body 122, the distal end of the tapered column section 121 extends to form a connecting section 123 for being fixedly connected with the pigtail 80, the tapered column section 121, the hemispherical body 122, the connecting section 123 and the main body 11 are coaxially arranged, and through holes 124 penetrating through two ends are formed in the centers of the tapered column section 121, the hemispherical body 122 and the connecting section 123.

A catheter pump, as shown in figure 1, comprises a motor 30, wherein the proximal end of the motor 30 is connected with a catheter 40, the distal end of the motor 30 is coaxially connected with an impeller 50, the periphery of the impeller 50 is covered with a blood outflow cage 60, the distal end of the blood outflow cage 60 is fixed with the proximal end of a main body part 11 of the blood inflow cage 10 through a sleeve 70, and the distal end of a connecting section 123 of the blood inflow cage 10 is also connected with a tail pipe 80. Since the distal end is disposed within the left ventricle after transvalve and the proximal end is disposed within the aorta during operation of the catheter pump, and since the proximal end is subject to gradual positional shift over time during operation, a pigtail 80 is employed as the distal end of the device in order to avoid damage to the ventricular wall during operation and implantation. The pig tail 80 is abutted against the ventricle to provide atraumatic support, the motor 30 is started to drive the impeller 50 to rotate, blood in the ventricle is sucked into the sleeve 70 from the blood inflow cage 10, and finally discharged into the aorta from the blood outflow cage 60, so that the auxiliary pumping of the ventricle is realized.

As shown in fig. 7, the pigtail 80 is provided with an electrical sensor 81 and a temperature sensor 82, wherein the electrical sensor 81 determines an impedance value according to the voltage drop to indicate whether there is a coanda thrombus, and the temperature sensor 82 is used for monitoring the temperature in the heart chamber to indicate adverse reaction, thereby ensuring the safety of the operation.

Further, the tail pipe 80 includes a flat section 80a and a curved section 80b, the rigidity of the flat section 80a is greater than that of the curved section 80b, the curved section 80b is closest to the proximal end and is a part directly contacting the inner wall of the ventricle, and the electric sensor 81 and the temperature sensor 82 are both disposed on the curved section 80b, so that various physiological indexes in the ventricle can be monitored more timely and accurately.

It will be understood by those skilled in the art that the present utility model is not limited to the details of the foregoing exemplary embodiments, but includes other specific forms of the same or similar structures that may be embodied without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (9)

1. The utility model provides a blood inflow cage, includes tubular main part (11), has seted up blood inflow port (111) on the perisporium of main part (11), and the distal end of main part (11) is connected with water droplet head (12), the distal end of water droplet head (12) be awl post section (121), its characterized in that: the cone column section (121) is provided with a developing mark (20).

2. The blood inflow cage of claim 1, wherein: the outer periphery of the conical column section (121) is provided with an annular groove (121 a), the developing mark (20) is of an annular structure, the developing mark (20) is embedded in the annular groove (121 a) to form fixed connection, and the outer wall of the developing mark (20) is a conical surface which is flush with and parallel to the outline of the outer wall of the conical column section (121).

3. The blood inflow cage of claim 1, wherein: the outer wall of the conical column section (121) is provided with a plurality of concave parts (121 b) at intervals along the circumferential direction, a plurality of developing marks (20) are embedded in the concave parts (121 b) to form fixed connection, and the outer wall of the developing mark (20) is a conical surface which is flush with and extends along with the outline of the outer wall of the conical column section (121).

4. The blood inflow cage of claim 1, wherein: the developing mark (20) is of an annular structure, the inner wall of the developing mark (20) is adhered to the periphery of the conical column section (121) through glue, and the periphery of the developing mark (20) is an arc surface and is in smooth transition with the conical column section (121) at the joint.

5. A blood inflow cage according to claim 2 or 3, wherein: the surface of the developing mark (20) at the position where it cooperates with the annular groove (121 a)/recess (121 b) is a roughened surface.

6. The blood inflow cage of claim 1, wherein: the proximal end of the cone column section (121) is integrally connected with a hemispherical body (122), the distal ends of support columns (112) on two sides of a blood inflow opening (111) on the main body part (11) are propped against and welded with the outer wall of the hemispherical body (122), the distal ends of the cone column section (121) are extended to form a connecting section (123), the cone column section (121), the hemispherical body (122), the connecting section (123) and the main body part (11) are coaxially arranged, and through holes (124) penetrating through two ends are formed in the centers of the cone column section (121), the hemispherical body (122) and the connecting section (123).

7. A catheter pump comprising the blood inflow cage of any one of claims 1-6, wherein: the blood flow-out device comprises a motor (30), wherein the proximal end of the motor (30) is connected with a catheter (40), the distal end of the motor (30) is coaxially connected with an impeller (50), a blood flow-out cage (60) is arranged on the periphery of the impeller (50), the distal end of the blood flow-out cage (60) is fixed with the proximal end of a main body part (11) of a blood flow-in cage (10) through a sleeve (70), and the distal end of a connecting section (123) of the blood flow-in cage (10) is further connected with a tail pipe (80).

8. The catheter pump of claim 7, wherein: an electric sensor (81) and a temperature sensor (82) are arranged on the pigtail (80).

9. The catheter pump of claim 8, wherein: the pigtail (80) comprises a straight section (80 a) and a bending section (80 b), the rigidity of the straight section (80 a) is larger than that of the bending section (80 b), and the electric sensor (81) and the temperature sensor (82) are arranged on the bending section (80 b).