Device for taking out foreign matters in heart cavity

Abstract

The utility model relates to the field of medical instruments, and discloses a device for taking out foreign matters in a heart cavity. The device for taking out the foreign matter in the heart cavity comprises a net basket assembly used for capturing and limiting the foreign matter; the ring sleeve assembly is used for dragging foreign matters into the net basket assembly; the conveying pipe is arranged at the near end of the mesh basket assembly; the conveying rod is arranged in the conveying pipe in a sliding mode, connected with the ring sleeve assembly and used for controlling the far end of the ring sleeve assembly to be close to or away from the net basket assembly. And the recovery sheathing canal is arranged at the near end of the mesh basket assembly and is arranged outside the conveying pipe in a sliding and sleeving manner. The device for taking out the foreign matters in the heart cavity has higher capturing efficiency, is simpler to operate and has higher success rate; meanwhile, used materials and structural design are metal nickel-titanium wire weaving heat setting and snare and catheter processes, and the machining process is mature, so that the production feasibility is high, the cost is low, the research and development period is short, and industrialization is easy.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, and more specifically, to a device for removing foreign bodies from a cardiac cavity. Background Art

[0002] Interventional therapy is one of the most important methods for treating modern heart diseases, including cardiac stent implantation, occluder placement, radiofrequency ablation, valve implantation, etc. In some cases, the device implanted in the heart falls off and falls into the heart cavity. The exogenous foreign body needs to be removed to avoid damaging the heart. It is usually removed by surgery or with the assistance of interventional devices. Interventional methods are less invasive and more popular in clinics, but the heart cavity is far from the peripheral vascular access, the foreign body will float in the heart cavity, and the heart cannot be viewed directly but can only be viewed with the assistance of X-ray plane images, making it difficult to fix, capture and remove the foreign body.

[0003] The current clinically used device is a snare, which is composed of a single or multiple metal wire circles. After the foreign body is caught, it is dragged into the catheter to complete the removal of the foreign body. Although this device causes little damage to the heart and has a simple structure that is easy to process and produce, it is inefficient in capturing foreign bodies. It takes a lot of time to constantly adjust the position of the snare, and multiple X-ray positions are required to repeatedly confirm the spatial relationship of the foreign body before the operation can be completed. Moreover, even if a foreign body is encountered, there is a possibility that the foreign body cannot enter the snare or slips out of it.

[0004] In view of the above, there is a current clinical need for a more efficient and more powerful capture capability device for removing foreign bodies from the cardiac cavity. Utility Model Content

[0005] The invention aims to provide a device for removing foreign bodies from the heart cavity which is more efficient and has a stronger capturing ability.

[0006] The utility model provides a device for removing foreign bodies from a cardiac cavity, comprising:

[0007] a basket assembly to capture and confine foreign matter;

[0008] a snare assembly for dragging foreign matter into the basket assembly;

[0009] A delivery tube, disposed at the proximal end of the basket assembly;

[0010] A delivery rod, slidably disposed in the delivery tube and connected to the snare assembly, for controlling the distal end of the snare assembly to approach or move away from the basket assembly; and

[0011] The recovery sheath is arranged at the proximal end of the basket assembly, and the sliding sleeve is arranged outside the delivery tube.

[0012] Optionally, the basket assembly is a basket structure with shape memory, and the basket assembly comprises:

[0013] A truncated cone portion, which is configured to have a structure with a wide distal end and a narrow proximal end; and

[0014] The trumpet portion is arranged at the proximal end of the truncated cone portion, and the proximal end of the trumpet portion is connected to the delivery tube.

[0015] By adopting the above technical solution, the structure of the truncated cone with a narrow front end and a wide rear end makes it difficult for foreign matter to escape from the basket assembly after entering it; and the structure of the trumpet part at the rear end allows the foreign matter to adjust its axis after entering the basket assembly so that the long axis of the foreign matter remains coaxial with the sheath, making it easy to collect it into the recovery sheath. At the same time, the trumpet part structure makes it easy for the recovery sheath to shrink the basket assembly so that the far end of the basket assembly forms a clamp-like state, and the basket clamps the foreign matter and then collects it into the recovery sheath. The basket assembly is similar to the current congenital heart occluder. It is made of nickel-titanium wire woven into multiple diamond-shaped grids and heat-set. It can be compressed into strips and transported in the catheter. After being sent out of the catheter, it restores the designed shape due to its morphological memory properties.

[0016] Optionally, the snare assembly comprises:

[0017] A sleeve removal member, arranged at the distal end of the basket assembly;

[0018] A plurality of connecting pieces are provided, one end of each connecting piece is connected to the proximal end of each sleeve, and the other end of each connecting piece repeatedly passes through the side wall of the basket assembly, and then passes through the conveying pipe and is connected to the conveying rod.

[0019] Optionally, the shape of the collection piece is a circle or an ellipse.

[0020] Optionally, one or more snare assemblies are provided.

[0021] By adopting the above technical solution, the trap assembly is one or more, the distal end is a circle or ellipse formed by metal wire (i.e., a trapping member), and the proximal end is connected to a thin metal rod (i.e., a conveying rod). The metal wire at the distal end repeatedly passes through several grids of the horn part of the basket assembly and is restricted, so that the trapping member moves on a fixed track. The proximal ends of both sides of the trapping member pass through the mesh of the basket assembly and then penetrate into the wall of the conveying tube and then converge to connect to the conveying rod, and the conveying rod is shaped in the conveying tube. The trapping member is perpendicular or approximately perpendicular to the opening plane of the truncated cone part of the basket assembly. The distal end of the trap assembly is located within the distal opening of the truncated cone part, so that it can drag foreign objects into the horn part of the basket assembly. When there is one trap assembly, the projection of the trap assembly in the cross section is the diameter of the truncated cone, that is, the metal wires (i.e., connectors) on both sides of the trap assembly are symmetrically distributed on both sides of the cross-sectional circle of the basket, and the circle is divided into two semicircles; when there are several trap assemblies, the projection of the trap assembly in the cross section is still the diameter of the truncated cone, and these projections divide the circle into a plurality of sectors. When there are several trap assemblies, these metal wires (connectors) are still gathered together to connect the conveying rod after passing through the side wall of the conveying tube, and the movement of all the trap assemblies is controlled by one conveying rod. By pushing the conveying rod toward the distal end, the circle (i.e., the trapping piece) at the distal end of the trap assembly can be enlarged and away from the opening of the truncated cone of the basket assembly; conversely, by pulling the conveying rod toward the proximal end, the circle (i.e., the trapping piece) at the distal end of the trap assembly can be reduced and close to the opening of the truncated cone of the basket assembly.

[0022] In summary, the utility model has the following beneficial effects:

[0023] The utility model of the intracardiac foreign body removal device uses a snare assembly to trap the foreign body so that the foreign body is close to the basket assembly and is included in the basket assembly. The truncated cone of the basket assembly makes it difficult for the foreign body to escape from the basket assembly. Then, through the contraction of the recovery sheath tube on the basket assembly, the truncated cone of the basket assembly forms a clamp-like structure to clamp and capture the foreign body. Through the clamping action of the basket assembly and the assistance of the snare assembly, the basket assembly is pulled back to collect the foreign body into the recovery sheath tube. This device does not directly use the snare assembly to pull the foreign body into the sheath tube as currently used in clinical practice, but collects the foreign body through the basket assembly. Because the basket assembly is a three-dimensional large-size multi-dimensional capture, and the trumpet structure enables the foreign body to automatically adjust its direction to keep it coaxial with the recovery sheath tube as much as possible, so that it is easy to be collected in the recovery sheath tube, so this device has a higher capture efficiency, simpler operation, and a higher success rate; at the same time, the materials and structural design used are metal nickel-titanium wire braided heat setting and snare device, catheter technology, and the processing technology is mature, so the production feasibility is large, the cost is low, the research and development cycle is short, and it is easy to industrialize. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the device for removing foreign bodies from the cardiac cavity in an embodiment of the utility model;

[0025] Description of the drawings: 1. basket assembly; 11. truncated cone; 12. horn; 2. snare assembly; 21. collection piece; 22. connector; 3. delivery tube; 4. delivery rod; 5. recovery sheath. DETAILED DESCRIPTION

[0026] The structure and effect of the utility model are further described in detail below in conjunction with the embodiments. It is to be understood that the specific embodiments described herein are only used to explain the invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention rather than the entire structure are shown in the drawings.

[0027] It is worth noting that the proximal end mentioned in the present invention refers to the end close to the operator during the surgical operation, and the distal end refers to the opposite end away from the operator and toward the patient's heart.

[0028] Example

[0029] The utility model provides a device for removing foreign bodies from a cardiac cavity, referring to Figure 1 , the device for removing foreign bodies from the cardiac cavity includes: a basket assembly 1, a snare assembly 2, a delivery tube 3, and a recovery sheath 5. The basket assembly 1 is formed by heat-setting a metal mesh woven from nickel-titanium wires with shape memory, and includes a front truncated cone portion 11 and a rear trumpet portion 12. The metal wires at the proximal end of the basket assembly 1 converge and are connected to the delivery tube 3 at the distal end. The truncated cone portion 11 is a structure with a narrow front end and a wide rear end, a trapezoidal longitudinal section, and a circular cross section. The distal end of the basket assembly 1, i.e., the distal end of the truncated cone portion 11, is a circular opening, and the proximal end of the basket assembly 1, i.e., the proximal end of the trumpet portion 12, converges into a bundle and is connected to the delivery tube 3. The structure of the truncated cone portion 11 with a narrow front end and a wide rear end makes it difficult for foreign bodies to escape from the basket after entering the basket assembly 1; and the structure of the trumpet portion 12 at the rear end allows the foreign body to adjust its axial direction after entering the basket assembly 1 so that the long axis of the foreign body remains coaxial with the recovery sheath 5, making it easy to be collected into the sheath. At the same time, the structure of the trumpet 12 makes it easy for the recovery sheath 5 to retract the basket assembly 1 so that the distal end of the basket assembly 1 forms a clamp-like state, and the basket assembly 1 clamps the foreign body and then collects the foreign body into the recovery sheath 5. The basket assembly 1 is similar to the current congenital heart occluder. The nickel-titanium metal wire is woven into a plurality of diamond-shaped grids and heat-set. It can be compressed into a strip shape for delivery in the catheter. After being delivered out of the catheter, it restores the designed shape due to the morphological memory property.

[0030] The snare assembly 2 is one or more, including a distal collection piece 21 and a proximal connection piece 22. The distal collection piece 21 is a circle or elliptical circle made of metal wire, which repeatedly passes through several grids of the trumpet part 12 of the basket assembly 1 and then passes through the tube wall of the delivery tube 3 to form a thin metal rod, which is the delivery rod 4. The delivery rod 4 is formed in the delivery tube 3. The intracardiac foreign body removal device includes a matching recovery sheath 5, which can accommodate the device and the foreign body into the recovery sheath 5 and then remove it from the body. Because the metal wire at the distal end of the snare assembly 2 repeatedly passes through several grids of the trumpet part 12 of the basket assembly 1 and is restricted, the metal ring moves on a fixed track. The collection piece 21 is perpendicular or approximately perpendicular to the opening plane of the truncated cone part 11 of the basket assembly 1. The distal end of the snare assembly 2 is located within the distal opening of the truncated cone part 11, so that it can drag the foreign body into the trumpet part 12 in the basket assembly 1. When there is one snare assembly 2, the projection of the snare assembly 2 in the cross section is the diameter of the truncated cone 11, that is, the metal wires on both sides of the snare assembly 2 are symmetrically distributed on both sides of the cross-sectional circle of the basket assembly 1, and the circle is divided into two semicircles; when there are multiple snare assemblies 2, the projection of the snare assembly 2 in the cross section is still the diameter of the truncated cone 11, and these projections divide the circle into 10 sectors. When there are multiple snare assemblies 2, these metal wires (connecting members 22) are still gathered together to connect the conveying rod 4 after passing through the side wall of the conveying tube 3, and the movement of all the snare assemblies 2 is controlled by one conveying rod 4. By pushing the conveying rod 4 to the far end, the circle at the far end of the snare assembly 2 (i.e., the trapping member 21) can be expanded and away from the opening of the truncated cone 11 of the basket assembly 1; conversely, by pulling the conveying rod 4 to the proximal end, the circle at the far end of the snare assembly 2 (i.e., the trapping member 21) can be reduced and close to the opening of the truncated cone 11 of the basket assembly 1.

[0031] The recovery sheath 5 can deliver the retrieval device to the heart cavity. After the device captures the foreign body, the device and the foreign body can be accommodated in the recovery sheath 5 and then removed from the body. The recovery sheath 5 is a hollow thin-walled tubular structure made of high-resolution material, and the distal end can have a bending function.

[0032] The implementation principle of the device for removing foreign bodies from the cardiac cavity of the present invention is as follows: the foreign body is trapped by the snare component 2 so that the foreign body is close to the basket component 1 and is included in the basket component 1; the truncated cone portion 11 of the basket component 1 makes it difficult for the foreign body to escape from the basket component 1; then, the basket component 1 is contracted by the recovery sheath 5 so that the truncated cone portion 11 of the basket component 1 forms a clamp-like structure to clamp and capture the foreign body; and through the clamping action of the basket component 1 and the assistance of the snare component 2, the basket component 1 is pulled back to collect the foreign body into the recovery sheath 5. This device does not directly use the snare component 2 to pull the foreign body into the sheath as currently used in clinical practice, but instead collects the foreign body through the basket component 1. Since the basket component 1 is a three-dimensional large-size multi-dimensional capture device, and the trumpet part 12 structure allows the foreign body to automatically adjust its direction to keep it coaxial with the recovery sheath 5 as much as possible, it is easy to be collected into the recovery sheath 5. Therefore, this device has higher capture efficiency, simpler operation, and higher success rate. At the same time, the materials and structural designs used are metal nickel-titanium wire braided heat setting and snare and catheter technology, and the processing technology is mature, so the production feasibility is high, the cost is low, the research and development cycle is short, and it is easy to industrialize.

[0033] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A device for removing foreign bodies from a cardiac cavity, characterized in that: include: A basket assembly (1) for capturing and confining foreign matter; A snare assembly (2) for dragging foreign matter into the basket assembly (1); A delivery pipe (3) is arranged at the proximal end of the basket assembly (1); a delivery rod (4) slidably disposed in the delivery tube (3) and connected to the snare assembly (2) for controlling the distal end of the snare assembly (2) to approach or move away from the basket assembly (1); and A recovery sheath (5) is arranged at the proximal end of the basket assembly (1), and a sliding sleeve is arranged outside the delivery tube (3).

2. The device for removing foreign bodies from the cardiac cavity according to claim 1, characterized in that: The basket assembly (1) is a basket structure with shape memory, and the basket assembly (1) comprises: The truncated cone portion (11) is configured to have a structure with a wide distal end and a narrow proximal end; and The trumpet portion (12) is arranged at the proximal end of the truncated cone portion (11), and the proximal end of the trumpet portion (12) is connected to the delivery tube (3).

3. The device for removing foreign bodies from the cardiac cavity according to claim 1, characterized in that: The snare assembly (2) comprises: A sleeve removal member (21) is arranged at the distal end of the basket assembly (1); and A plurality of connecting members (22) are provided, one end of each connecting member (22) is connected to the proximal end of the sleeve member (21), and the other end of each connecting member (22) repeatedly passes through the side wall of the basket assembly (1), and then passes through the conveying pipe (3) to be connected to the conveying rod (4).

4. The device for removing foreign bodies from the cardiac cavity according to claim 3, characterized in that: The shape of the sleeve (21) is a circle or an ellipse.

5. The device for removing foreign bodies from the cardiac cavity according to claim 3, characterized in that: The snare assembly (2) is provided with one or more.

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