Device for taking out foreign matters in cavity

Abstract

The utility model provides a device for taking out foreign matters in a cavity. The device comprises an outer sheath tube, an inner sheath tube, a clamping structure, a first handheld part and a second handheld part, the outer sheath tube is provided with a first bending adjusting structure, and the first bending adjusting structure comprises a plurality of first bending adjusting guide wires arranged on the wall of the outer sheath tube. And the inner sheath tube extends into the outer sheath tube. The clamping structure comprises a traction head arranged at the far end of the inner sheath tube. The first handheld part is arranged at the near end of the outer sheath tube and provided with a first movable handle in transmission connection with the first bending adjusting guide wire and a first fixed handle fixedly connected to the near end of the outer sheath tube. The second handheld part is arranged at the near end of the inner sheath tube and provided with a hand ring connected with the traction head. The problem that in the prior art, an intracavitary foreign matter taking-out instrument is limited by the structure and the success rate of taking out foreign matter is low is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a device for removing foreign bodies from a cavity. Background Art

[0002] After a period of device implantation in the blood vessels, the devices in the blood vessels need to be removed, such as filters, catheters or other foreign bodies. Taking filters as an example, the inferior vena cava filter (IVCF) is a device designed to prevent deep vein thrombosis from detaching and causing fatal pulmonary embolism (PE). The placement of an inferior vena cava filter significantly reduces the incidence of pulmonary embolism, especially pulmonary embolism caused by deep venous thrombosis (DVT) in the lower extremities.

[0003] The probability of complications caused by prolonged indwelling filters in the body, such as filter adhesion and tilting, breakage (2%~10%), displacement (0~18%), venous wall penetration (0~50%), thrombosis (2%~30%), or recurrence of pulmonary embolism and deep vein thrombosis of the lower limbs (0.5%~6%), etc., increases year by year. Filter recovery often encounters various problems, resulting in recovery difficulties or even failure. At present, the recovery rate of inferior vena cava filters is only 34%. In the prior art, the inferior vena cava filter is mainly recovered by using a snare and a biopsy forceps. When using a snare to recover the inferior vena cava filter, the snare can be used to trap the filter and tighten the snare to separate the filter from the wall of the inferior vena cava. The difficulty of using this method is that it is difficult for the snare to accurately trap the inferior vena cava filter, and the probability of recovery failure is relatively high. In the case of severe adhesion of the filter tissue, the pulling action is very likely to cause serious consequences such as wall damage and penetration, filter damage, etc. due to the problem of the direction and magnitude of the force used; when using a biopsy forceps to recover the inferior vena cava filter, the filter can be clamped by the clamp head of the biopsy forceps, but the direction of the clamp head of the biopsy forceps is difficult to control. In some cases where the filter tissue is severely adhered, the filter will adhere to the wall of the tube, resulting in the biopsy forceps being unable to accurately align with the corresponding clamping position. In addition, the above problems will also occur in the process of removing the catheter or other foreign matter, resulting in a long operation time or even failure of the operation.

[0004] The above existing methods for removing foreign bodies from the cavity have the disadvantage of being difficult to control the force and direction, which can easily lead to failure in removing the foreign bodies. Utility Model Content

[0005] Therefore, the present invention aims to solve the problem that the existing method for removing foreign bodies in the cavity has the disadvantage of being difficult to control the force and direction, which easily leads to the failure of foreign body removal, and thus provides a device for removing foreign bodies in the cavity.

[0006] In order to solve the above problems, the utility model provides a device for removing foreign bodies from a cavity, comprising:

[0007] The outer sheath is provided with a first bending adjustment structure, wherein the first bending adjustment structure comprises a plurality of first bending adjustment guide wires arranged on the wall of the outer sheath;

[0008] An inner sheath tube extending into the outer sheath tube;

[0009] A gripping structure, comprising a traction head arranged at the distal end of the inner sheath tube;

[0010] A first hand-held portion, disposed at the proximal end of the outer sheath tube, comprising a first movable handle transmission-connected to the first bending guide wire and a first fixed handle fixedly connected to the proximal end of the outer sheath tube;

[0011] The second hand-held part is arranged at the proximal end of the inner sheath tube and has a hand ring connected with the traction head.

[0012] Optionally, the traction head is a clamping claw, the clamping structure includes a first traction wire arranged in the inner sheath tube and transmission-connected to the clamping claw, and the bracelet is connected to the first traction wire.

[0013] Optionally, the clamp includes at least two clamp arms, a traction block is provided between the clamp arms and the first traction wire, and at least two clamps are respectively connected to the traction block via second traction wires.

[0014] Optionally, the traction head is a traction sleeve, which includes a traction ring and a plurality of third traction wires, wherein the proximal ends of the plurality of third traction wires are connected to the first traction wire, and the distal ends are connected to the traction ring at intervals.

[0015] Optionally, a plurality of depressions are provided on the traction ring, and the depressions are located between two adjacent connection points between the traction wires and the traction ring.

[0016] Optionally, a first bending adjustment channel is provided on the side wall of the outer sheath tube, the first bending adjustment guide wire is arranged in the first bending adjustment channel, the extension direction of the first bending adjustment channel is the same as the extension direction of the outer sheath tube, and multiple first bending adjustment channels are arranged at intervals along the circumference of the outer sheath tube, and the number of the first bending adjustment guide wires corresponds to the number of the first bending adjustment channels.

[0017] Optionally, the distal end of the inner sheath tube includes an expansion portion, the expansion portion is molded from an elastic material, and the diameter of the expansion portion gradually increases from the proximal end to the distal end.

[0018] Optionally, the first movable handle is rotatably connected to the proximal end of the outer sheath tube, the first end of the first movable handle is connected to the first bending adjustment guide wire and can selectively drive the first bending adjustment guide wire to move toward the proximal end or distal end of the outer sheath tube to control the bending or straightening of the distal end of the outer sheath tube, and a first return spring is arranged between the first movable handle and the first fixed handle.

[0019] Optionally, the second hand-held portion includes a second handle disposed at the proximal end of the inner sheath, and the hand ring is adapted to move relative to the second handle.

[0020] The utility model has the following advantages:

[0021] The utility model provides an intracavitary foreign body removal device, comprising: an outer sheath, an inner sheath, a clamping structure, a first hand-held part and a second hand-held part. The outer sheath is provided with a first bending adjustment structure, and the first bending adjustment structure comprises a plurality of first bending adjustment guide wires arranged on the wall of the outer sheath. The inner sheath extends into the outer sheath. The clamping structure comprises a traction head arranged at the distal end of the inner sheath. The first hand-held part is arranged at the proximal end of the outer sheath, and comprises a first movable handle transmission-connected to the first bending adjustment guide wire and a first fixed handle fixedly connected to the proximal end of the outer sheath. The second hand-held part is arranged at the proximal end of the inner sheath, and comprises a wristband connected to the traction head.

[0022] The outer sheath is then moved proximally and the traction head is extended to correspond to the inferior vena cava filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 The schematic diagram of the structure of the intracavitary foreign body removal device provided in the first embodiment is shown;

[0025] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0026] Figure 3 A schematic diagram showing the structure of the clamping jaws in the extended state in the first embodiment is shown;

[0027] Figure 4 A schematic diagram of the cross-sectional structure of the inner sheath tube and the outer sheath tube in the first embodiment is shown;

[0028] Figure 5 A schematic diagram of the structure of the expansion portion in the first embodiment is shown;

[0029] Figure 6 A schematic diagram of the structure of the traction ring in the second embodiment is shown;

[0030] Figure 7 Shows Figure 6 Schematic diagram of the structure of the middle traction ring from a top view.

[0031] Description of reference numerals:

[0032] 1. Outer sheath; 11. First bending guide wire; 111. First bending channel; 2. Inner sheath; 21. Expansion part; 3. Clamp; 31. First traction wire; 32. Bracelet; 33. Traction block; 34. Second traction wire; 351. Clamp arm; 36. Second handle; 41. First movable handle; 42. First fixed handle; 43. First return spring; 5. Traction sleeve; 51. Traction ring; 511. Recess; 52. Third traction wire. DETAILED DESCRIPTION

[0033] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] Embodiment 1

[0038] like Figure 1 , Figure 2 and Figure 3 As shown, in this embodiment, a device for removing foreign bodies in the cavity is provided, including: an outer sheath tube 1, an inner sheath tube 2, a clamping structure, a first hand-held part and a second hand-held part. The outer sheath tube 1 is provided with a first bending adjustment structure, and the first bending adjustment structure includes a plurality of first bending adjustment guide wires 11 arranged on the tube wall of the outer sheath tube 1. The inner sheath tube 2 extends into the outer sheath tube 1. The clamping structure includes a traction head arranged at the distal end of the inner sheath tube 2. The first hand-held part is arranged at the proximal end of the outer sheath tube, and has a first movable handle 41 that is transmission-connected to the first bending adjustment guide wire 11 and a first fixed handle 42 that is fixedly connected to the proximal end of the outer sheath tube. The second hand-held part is arranged at the proximal end of the inner sheath tube 2, and has a bracelet 32 ​​connected to the traction head. Among them, the outer sheath tube 1 is suitable for wrapping the inner sheath tube 2 and the clamping structure, and can be easily pushed into the inferior vena cava, so as to avoid the clamping structure at the distal end of the inner sheath tube 2 from scratching the vascular wall when being pushed to the inferior vena cava.

[0039] For example, when recovering the inferior vena cava filter, the end of the inner sheath tube 2 and the traction head can be retracted into the distal end of the outer sheath tube 1, and then the outer sheath tube 1 is sent into the patient's inferior vena cava until it reaches the corresponding position close to the inferior vena cava filter. The distal end of the inner sheath tube 2 is pushed out from the distal end of the outer sheath tube 1, and then the traction head is extended, and the distal end of the outer sheath tube 1 is oriented to correspond to the inferior vena cava filter through the first bending adjustment guide wire 11 of the first bending adjustment structure. For example, the first bending adjustment guide wire 11 can be controlled to move by the first movable handle 41 of the first hand-held part to adjust the direction of the distal end of the outer sheath tube 1. In this way, the traction head is adjusted to face the inferior vena cava filter. , it can be ensured that multiple clamps 3 can accurately contact and pull the inferior vena cava filter, so that the situation where the inferior vena cava filter may be adhered to the inner wall of the vein can be dealt with, and the problem of inconvenient force and direction control of the filter removal instrument in the prior art is solved. After the traction head pulls the inferior vena cava filter, the traction head can be used to drive the inferior vena cava filter to the inner cavity of the inner sheath tube 2, and then the inner sheath tube 2 is moved proximally and retracted into the inner cavity of the outer sheath tube 1, the traction head and the inferior vena cava filter are retracted into the outer sheath tube 1 together, and then the outer sheath tube 1 is pulled out to leave the inferior vena cava of the patient, thereby improving the safety of the operation.

[0040] When the intracavitary foreign body removal device in this embodiment is used to recover a catheter or other foreign bodies, the recovery can also be performed in the same operating manner and has the same technical effect.

[0041] It should be noted that the "proximal end" and "distal end" mentioned in this embodiment are defined based on the positional relationship between the instrument and the operator. The end closer to the operator is the "proximal end" and the end farther from the operator is the "distal end". This definition is used throughout the text.

[0042] like Figure 1 , Figure 2 and Figure 3 As shown, in the present embodiment, the traction head is a clamp 3, and the clamping structure includes a first traction wire 31 which is arranged in the inner sheath 2 and is transmission-connected to the clamp 3, and a hand ring 32 is connected to the first traction wire 31. After the clamp 3 corresponds to the position of the inferior vena cava filter, the hand ring 32 can be pulled, and the hand ring 32 drives the first traction wire 31 to move toward the proximal end of the inner sheath 2 to drive the clamp 3 to clamp the inferior vena cava filter. Conversely, pushing the hand ring 32 drives the first traction wire 32 to move toward the distal end of the inner sheath 2 to drive the clamp 3 to loosen the inferior vena cava filter.

[0043] like Figure 1 , Figure 2 and Figure 3As shown, in this embodiment, the clamp 3 includes at least two clamp arms 351, and a traction block 33 is arranged between the clamp arm 351 and the first traction wire 31. At least two clamp arms 351 are connected to the traction block 33 through the second traction wire 34 respectively. The number and setting position of the second traction wire 34 correspond to the number and setting position of the clamp arms 351. When the bracelet 32 ​​is pulled or pushed, the first traction wire 31, the traction block 33, and multiple second traction wires 34 drive the corresponding clamp arms 351 to clamp or release. Such a setting can improve the stability of the clamping action or release action of multiple clamps 3, and can make each clamp evenly force to perform synchronous grasping or releasing actions.

[0044] For example Figure 2 As described, the clamp 3 may include three clamp arms 351, the outside of the traction block 33 is provided with a slidingly fitted traction tube 352, the proximal end of the traction tube 352 abuts against the bracelet 32, the first traction wire 31 is located in the traction tube 352, the proximal end of the clamp arm 351 is hinged to the distal end of the traction tube 352 through a rotating shaft, and the second traction wire 34 bypasses the rotating shaft and is connected to the inner side of the clamp arm 351. When it is necessary to clamp the inferior vena cava filter, the traction tube 352 can be pushed out through the bracelet 32 ​​to a certain length extending out of the inner sheath tube 2. When the three clamp arms 351 move to contact the inferior vena cava filter, the bracelet 32 ​​is pulled to separate the bracelet 32 ​​from the traction tube 352. Then the traction block 33 drives the three second traction wires 34 to move proximally, which can drive the three clamp arms 351 to move toward each other, thereby performing a clamping action to clamp the inferior vena cava filter. The bracelet 32 ​​is continued to be pulled to drive the traction tube 352, the clamp 3 and the inferior vena cava filter to retract the inner cavity tube.

[0045] Of course, the number of the clamp arms 351 can be flexibly set according to actual conditions, as long as it can ensure that the inferior vena cava filter is clamped.

[0046] The traction block 33 can ensure that each second traction wire 34 is subjected to the same pulling force and pushing force.

[0047] like Figure 2 and Figure 4 As shown, in the present embodiment, a first bending adjustment channel 111 is provided on the side wall of the outer sheath tube 1, and a first bending adjustment guide wire 11 is provided in the first bending adjustment channel 111. The extension direction of the first bending adjustment channel 111 is the same as the extension direction of the outer sheath tube 1. A plurality of first bending adjustment channels 111 are arranged at circumferential intervals along the outer sheath tube 1, and the number of first bending adjustment guide wires 11 corresponds to the number of first bending adjustment channels 111. The first bending adjustment channel 111 can facilitate the assembly of the first bending adjustment guide wire 11, and the plurality of first bending adjustment guide wires 11 are arranged at circumferential intervals along the outer sheath tube 1, which can flexibly adjust the distal end of the outer sheath tube 1 to various angles, so as to facilitate the subsequent adjustment of the direction of the inner sheath tube 2.

[0048] like Figure 5 As shown, in this embodiment, the distal end of the inner sheath tube 2 includes an expansion portion 21, and the expansion portion 21 is formed by an elastic material. The diameter of the expansion portion (21) gradually increases from the proximal end to the distal end. For example, the elastic material can be made of nickel-titanium memory metal and common materials for medical sheath tubes. The medical sheath tube itself has elasticity. The nickel-titanium memory metal can be mesh-shaped and shaped into a shape that gradually expands from the proximal end to the distal end. In this way, after the expansion portion 21 extends out of the outer sheath tube 1, the nickel-titanium memory metal can be restored to its original expansion state when heated, so that a funnel-like structure is formed at the distal end of the inner sheath tube 2, which is conducive to retracting the inferior vena cava filter into the inner sheath tube 2 to avoid being blocked by the tube opening of the inner sheath tube 2 during the retraction process.

[0049] like Figure 1 As shown, in the present embodiment, the first movable handle 41 is rotatably connected to the proximal end of the outer sheath tube 1. For example, the first movable handle 41 can be connected to the proximal end of the outer sheath tube 1 through a rotating shaft. The first movable handle 41 can swing toward or away from the first fixed handle 42 with the rotating shaft as the swing center. The end of the first movable handle 41 close to the outer sheath tube 1 is defined as the first end, and the other end is defined as the second end. The first end of the first movable handle 41 is connected to the first bending guide wire 11 and can selectively drive the first bending guide wire 11 to move toward the proximal end or distal end of the outer sheath tube 1 to control the bending or straightening of the distal end of the outer sheath tube 1.

[0050] The proximal end of the outer sheath tube 1 can be configured using the fixed pulley principle so that the first movable handle 41 can drive the first bending adjustment guide wire 11 to move. For example, a first guide column is set on the inner sheath tube, and the part of the first bending adjustment guide wire 11 located at the proximal end of the outer sheath tube 1 bypasses the first guide column and is connected to the first end of the first movable handle 41. In this way, when the first end of the first movable handle 41 moves away from the first fixed handle 42, the first movable handle 41 can pull the first bending adjustment guide wire 11 located at the distal end of the outer sheath tube 1 to move toward the proximal end of the outer sheath tube 1, thereby realizing the bending action.

[0051] A first return spring 43 is arranged between the first movable handle 41 and the first fixed handle 42. When the first movable handle 41 is moved toward the first fixed handle 42, the first return spring 43 obtains elastic potential energy. When the force applied to the first movable handle 41 is reduced, the first return spring 43 will drive the first movable handle 41 to move to its original position in the direction away from the first fixed handle 42 through elastic force, so that the first bending guide wire 11 in the outer sheath 1 can restore its initial state, thereby straightening the distal end of the inner sheath, thereby improving convenience.

[0052] like Figure 1As shown, in this embodiment, the second hand-held portion includes a second handle 36 arranged at the proximal end of the inner sheath 2, and the bracelet 32 ​​is suitable for moving relative to the second handle 36. The setting of the second handle 36 is convenient for the operator to use the index finger to resist, thereby facilitating the operator to pull or push the bracelet 32.

[0053] Embodiment 2

[0054] like Figure 6 and Figure 7 As shown, the difference between this embodiment and the first embodiment is that the traction head is a traction sleeve 5, and the other structures are exactly the same as those in the first embodiment, and the method of use is also the same. The structures that are different between this embodiment and the first embodiment are introduced below:

[0055] In this embodiment, the traction head is a traction sleeve 5, which includes a traction ring 51 and a plurality of third traction wires 52. The proximal ends of the plurality of third traction wires 52 are connected to the first traction wire 31, and the distal ends are connected to the traction ring 51 at intervals, for example Figure 6 As shown, one end of three third traction wires 52 are connected together, and the other ends are connected to the traction ring 51 at intervals, and the traction ring 51 is divided equally. The traction ring 51 is elastic. When the traction ring 51 is in the inner sheath tube 2, it can shrink into a cylindrical structure, and restore the ring structure after extending out of the inner sheath tube 2. The traction ring 51 can pull the inferior vena cava filter, and then retract into the inner sheath tube 2 under the drive of the third traction wire 52. Then, according to the method of embodiment 1, the distal end of the inner sheath tube 2, the traction ring 51 and the inferior vena cava filter are all retracted into the outer sheath tube 1, and then the outer sheath tube 1 is extracted. During the deformation of the traction ring 51, the traction ring 51 can clamp the inferior vena cava filter with the corresponding third traction wire 52. For example, the segments of two adjacent third traction wires 52 and the traction ring 51 located between them can gather in a direction close to each other, so as to clamp the inferior vena cava filter together, thereby ensuring that the inferior vena cava filter can be effectively separated from the tissue, and improving the success rate of removing the inferior vena cava filter.

[0056] like Figure 7 As shown, in this embodiment, a plurality of recesses 511 are provided on the traction ring 51, and the recesses 511 are located between the connection points of two adjacent traction wires and the traction ring 51. The recesses 511 facilitate the entry of the inferior vena cava filter. After the recesses 511 pull the inferior vena cava filter, the hand ring 32 can be pulled according to the above steps, and the third traction wire 52 can drive the traction ring 51 to retract into the inner sheath 2. For example Figure 7 As shown, a recess 511 is provided between the traction rings 51 between adjacent third traction wires 52, and two or more recesses 511 may be provided at intervals according to actual conditions, depending on actual conditions.

[0057] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A device for removing foreign bodies from a cavity, characterized in that: include: An outer sheath tube (1) is provided with a first bending adjustment structure, wherein the first bending adjustment structure comprises a plurality of first bending adjustment guide wires (11) arranged on the wall of the outer sheath tube (1); An inner sheath tube (2) extends into the outer sheath tube (1); A gripping structure, comprising a traction head arranged at the distal end of the inner sheath tube (2); A first hand-held portion, arranged at the proximal end of the outer sheath tube (1), comprising a first movable handle (41) transmission-connected to the first bending guide wire (11) and a first fixed handle (42) fixedly connected to the proximal end of the outer sheath tube (1); The second hand-held portion is arranged at the proximal end of the inner sheath tube (2) and has a hand ring (32) connected to the traction head.

2. The intracavitary foreign body removal device according to claim 1, characterized in that: The traction head is a clamping claw (3), the clamping structure comprises a first traction wire (31) arranged in the inner sheath tube (2) and transmission-connected to the clamping claw (3), and the hand ring (32) is connected to the first traction wire (31).

3. The intracavitary foreign body removal device according to claim 2, characterized in that: The clamping jaw (3) comprises at least two clamping jaw arms (351), a traction block (33) is provided between the clamping jaw arms (351) and the first traction wire (31), and at least two of the clamping jaws (3) are respectively connected to the traction block (33) via second traction wires (34).

4. The intracavitary foreign body removal device according to claim 1, characterized in that: The traction head is a traction sleeve (5), which comprises a traction ring (51) and a plurality of third traction wires (52), wherein the proximal ends of the plurality of third traction wires (52) are connected to the first traction wire (31), and the distal ends are connected to the traction ring (51) at intervals.

5. The intracavitary foreign body removal device according to claim 4, characterized in that: The traction ring (51) is provided with a plurality of recesses (511), wherein the recesses (511) are located between two adjacent connection points between the traction wires and the traction ring (51).

6. The intracavitary foreign body removal device according to claim 1, characterized in that: A first bending adjustment channel (111) is provided on the side wall of the outer sheath tube (1), the first bending adjustment guide wire (11) is arranged in the first bending adjustment channel (111), the extension direction of the first bending adjustment channel (111) is the same as the extension direction of the outer sheath tube (1), a plurality of first bending adjustment channels (111) are arranged at intervals along the circumference of the outer sheath tube (1), and the number of the first bending adjustment guide wires (11) corresponds to the number of the first bending adjustment channels (111).

7. The intracavitary foreign body removal device according to claim 1, characterized in that: The distal end of the inner sheath tube (2) comprises an expansion portion (21), the expansion portion (21) is formed by molding an elastic material, and the diameter of the expansion portion (21) gradually increases from the proximal end to the distal end.

8. The intracavitary foreign body removal device according to claim 1, characterized in that: The first movable handle (41) is rotatably connected to the proximal end of the outer sheath tube (1), and the first end of the first movable handle (41) is connected to the first bending guide wire (11) and can selectively drive the first bending guide wire (11) to move toward the proximal end or distal end of the outer sheath tube (1) to control the bending or straightening of the distal end of the outer sheath tube (1), and a first return spring (43) is arranged between the first movable handle (41) and the first fixed handle (42).

9. The intracavitary foreign body removal device according to claim 1, characterized in that: The second hand-held portion comprises a second handle (36) arranged at the proximal end of the inner sheath tube (2), and the hand ring (32) is suitable for moving relative to the second handle (36).

Images