Cut-resistant reinforced biological specimen retrieval device

Abstract

The utility model discloses a prevent cutting reinforced biological specimen recovery device containing handle, sheath pipe, take in bag, open device and prevent cutting mechanism. Sheath pipe contains inner sheath pipe and outer sheath pipe, and the proximal end of inner sheath pipe is connected with handle, and the distal end of inner sheath pipe is connected with open device. Take in bag contains bag body, tension device and traction device, and the open device is installed on bag body, and the tension device is exposed from the proximal end of outer sheath pipe after passing through the installation passage of bag body, and the distal end of traction device is connected with bag body, and the proximal end is connected with handle. The prevent cutting mechanism is arranged on take in bag and / or outer sheath pipe, can avoid or reduce the cutting effect between bag body and outer sheath pipe when bag body enters outer sheath pipe, makes clinical use in the process of pulling into or pushing out outer sheath pipe, and bag body is not easy to be torn and lead to bag body breakage, and clinical use is safer.

Description

Technical Field

[0001] This utility model relates to a laparoscopic surgical instrument, and more particularly to a cut-resistant reinforced biological specimen retrieval device used in laparoscopic surgery. Background Technology

[0002] Laparoscopic surgery has been used more and more widely. In order to safely remove the excised biological specimens through small incisions, prevent residual tissue fragments or leakage of fluid in the body, and especially avoid the spread and implantation of cancer cells, specimen retrieval devices are now commonly used in surgery to safely remove surgical specimens.

[0003] To further enhance the strength of the storage bag and prevent rupture or leakage during tissue retrieval, various reinforced bag materials are increasingly being adopted. Typical examples include composite films composed of nylon and thermoplastic polyurethane (TPU), or composite films composed of polypropylene and TPU. While these composite film materials possess excellent tensile strength and impermeability, their thickness and difficulty in unfolding after prolonged periods of being folded or compressed make them unusable. Therefore, during product packaging and storage, the bag is typically stored unfolded. For clinical use, the bag must first be retracted into an external sheath, then the sheath is inserted into the body via a trocar before the bag is pushed out of the sheath for release.

[0004] Currently, to meet the needs of minimally invasive surgery in clinical practice, the volume of the outer sheath needs to be minimized. Therefore, the outer sheath is usually made of rigid, thin-walled tubing. Because the bag is made of a thicker composite membrane, it is relatively large in volume, which can easily cause blockage at the entrance when the outer sheath is inserted. Since the outer sheath is made of rigid, thin-walled tubing, it is very easy to cause a cutting action at the entrance, resulting in the knife bag being torn or damaged.

[0005] Therefore, existing specimen recovery devices need further improvement to better avoid or reduce the bag cutting effect that may occur during use. Summary of the Invention

[0006] This invention, through the design of an anti-cutting mechanism, can avoid or reduce the cutting action between the bag body 31 and the outer sheath tube 22 when the bag body 31 enters the outer sheath tube 22, making it less likely for the bag body 31 to tear or break when entering the outer sheath tube 22, thus making it safer for clinical use.

[0007] This utility model discloses a cut-resistant reinforced biological specimen recovery device, comprising a handle 1, a sheath 2, a storage bag 3, an opening device 4, and a cut-resistant mechanism 5, characterized in that:

[0008] A. The sheath 2 includes an inner sheath 21 and an outer sheath 22; the proximal end of the inner sheath 21 is connected to the connecting part 11 of the handle 1, and the distal end of the inner sheath 21 is connected to the opening device 4.

[0009] B. The storage bag 3 includes a bag body 31, a tensioning device 32, and a traction device 33; the opening device 4 is installed on the bag body 31, and the proximal end of the opening device 4 is connected to the distal end of the inner sheath tube 21; the tensioning device 32 passes through the installation channel 31-1 of the bag body 31 and extends proximally to the proximal end of the inner sheath tube 21 and is exposed proximally to the outer sheath tube 22; the distal end of the traction device 33 is connected to the bag body 31, and the proximal end of the traction device 33 passes through the outer sheath tube 22 and is connected to the handle 1;

[0010] C. The anti-cutting mechanism 5 is provided on the storage bag 3 and / or the outer sheath tube 22. The anti-cutting mechanism 5 can avoid or reduce the cutting action between the bag body 31 and the outer sheath tube 22 when the bag body 31 enters the outer sheath tube 22.

[0011] D. When using, the handle 1 must first be pulled proximally to move the inner sheath 21 and the traction device 33 proximally, pulling the bag 31 into the outer sheath 22. After entering the body cavity, the handle 1 is then pushed distally to push the bag 31 out of the outer sheath 22 before it can be used. Therefore, the anti-cutting mechanism 5 makes it less likely that the bag 31 will be torn or damaged during clinical use when pulling the bag 31 into or out of the outer sheath 22.

[0012] Since the bag body 31 of the storage bag 3 is usually made of high-strength medical elastic material, it has a certain thickness to ensure its strength and leak-proof performance. To ensure the bag body 31 can open smoothly after entering the body cavity, it is usually in an unfolded state during storage. In clinical use, the bag body 31 is first pulled into the outer sheath 22. After entering the body cavity, the handle 1 is pushed distally to release the bag body 31 from the outer sheath 22 for use. To meet the requirements of minimally invasive procedures in clinical practice, the outer sheath 22 is usually made of a rigid, thin-walled tube to minimize the tube wall thickness, thereby reducing the outer diameter of the outer sheath 22 as much as possible. Therefore, the cross-section of the distal port 22-2 is a very narrow, flat end face. Because the bag body 31 is relatively thick, when the bag body 31 is pulled into the outer sheath tube 22, the bag body 31 is usually pulled into the outer sheath tube 22 in a relatively tight state. Since the cross-section of the distal port 22-2 is a very narrow flat end face, the bag body 31 blocking the distal port 22-2 is very likely to cut against the flat end face of the distal port 22-2. This cutting effect is more obvious when the bag body 31 is pulled inward at a fast speed. When the force generated by the cutting effect is greater than the tensile strength of the bag body 31, the bag body 31 may be torn and damaged, making it unusable.

[0013] In this application, the anti-cutting mechanism 5 is specially provided. The anti-cutting mechanism 5 can be set on the storage bag 3 for cut protection, or it can be set at the far end of the outer sheath tube 22 to protect or enhance the bag body 31 when it enters the outer sheath tube 22, reduce the cutting action between the bag body 31 and the flat end face of the far end port 22-2, thereby avoiding or reducing the risk of the bag body 31 being torn.

[0014] The anti-cutting mechanism 5 avoids or reduces the cutting action between the bag body 31 and the outer sheath tube 22 when the bag body 31 enters the outer sheath tube 22 by adjusting the direction of movement and / or reducing the resistance to movement and / or reducing the pressure at the contact point. The applicant has only specifically illustrated the above three anti-cutting methods here. In practical applications, those skilled in the art can design anti-cutting mechanisms 5 with different structures and methods according to actual needs. The applicant will not provide examples of each, but none of them depart from the scope of protection of this application.

[0015] The traction device 33 is made of high-strength polymer material. Its distal end extends downwards along the upper part of the proximal side 31-2 of the bag body 31 and forms a fixed connection with the proximal side 31-2. The proximal end of the traction device 33 passes through the working channel 22-1 of the outer sheath tube 22 and is fixed to the handle 1. After installation, the connection 34 between the traction device 33 and the bag body 31 forms an angle β with the axis of the outer sheath tube 22. When the traction device 33 pulls towards the proximal end, the connection 34 pulls the proximal side 31-2, causing the bag... The movement direction of the body 31 gradually approaches the axial direction of the outer sheath tube 22 until it moves along the axial direction. During the movement, due to the directional traction effect of the connection 34, when the bag body 31 is pulled into the outer sheath tube 22, the bag body 31 is not likely to converge or block at the distal port 22-2 of the outer sheath tube 22, causing excessive movement resistance, thereby avoiding the bag body 31 being cut by the distal port 22-2, resulting in tearing or damage. The specific movement direction adjustment capability of the connection 34 constitutes the anti-cutting mechanism 5 that can adjust the movement direction.

[0016] Typically, the traction device 33 is a soft, high-strength textile material, forming a strip-shaped traction strap 33-1. The distal end of the traction strap 33-1 extends from the upper part of the proximal side 31-2 of the bag body 31 towards the bottom edge, and is fixedly connected to the proximal side 31-2 by means of sewing, heat sealing, or bonding. The traction strap 33-1 is hollow, and the proximal end of the tensioning device 32 passes through the pull wire channel 33-11 of the traction strap 33-1 and protrudes from the proximal end of the outer sheath tube 22 together with the proximal end of the traction strap 33-1. The proximal end of the traction strap 33-1 is provided with a connecting buckle 33-12 for connection and fixation to the handle 1. Pulling the handle 1 backward causes the traction strap 33-1 to move towards the proximal end of the outer sheath 22. Since a strip-shaped connection 34 is formed between the distal end of the traction strap 33-1 and the proximal side 31-2 of the bag body 31, this connection 34, under external force, pulls the proximal side 31-2 of the bag body 31 towards the outer sheath 22. As the bag body 31 gradually moves towards the proximal end along the working channel 22-1 of the outer sheath 22, its direction of movement gradually approaches the axial direction of the outer sheath 22 until it moves parallel to the axial direction. This adjustment in the direction of movement makes it less likely for the bag body 31 to converge and become blocked at the distal port 22-2 of the outer sheath 22, causing excessive resistance. This effectively avoids or reduces the cutting effect of the flat end face of the distal port 22-2 on the bag body 31, thus preventing the bag body 31 from being torn and damaged. In particular, since the traction strap 33-1 is made of high-strength textile, when the distal end of the traction strap 33-1 unfolds and wraps around both sides of the proximal side 31-2 of the bag body 31 and then sews them together, it can simultaneously isolate, protect and increase the strength of the proximal side 31-2 of the bag body 31, and further reduce the risk of the bag body 31 being torn.

[0017] Preferably, the β angle is greater than 90°. The preferred angle range of the β angle is between 100° and 120°. Within this angle range, it can ensure that the connection 34 plays a good role in traction and reversal of the movement direction of the bag 31, and also ensure a good depth difference between the bag and the outer sheath, thus ensuring good tissue retraction capacity during the operation.

[0018] The length of the connection 34 extending along the proximal side 31-2 is at least 1 cm. Typically, the length of the connection 34 extending along the proximal side 31-2 is 2 to 3 cm. This length ensures good traction while minimizing the volume increase caused by the connection 34, reducing the degree of blockage to the distal port 22-2, and controlling the movement resistance from increasing significantly.

[0019] The anti-cutting mechanism 5 is a super-slippery part 22-3 located at the distal end of the outer sheath tube 22 to reduce the movement resistance of the bag body 31 when it enters the outer sheath tube 22, preventing the bag body 31 from being torn or damaged. The outer sheath tube 22 can be made entirely of a super-slippery material, with the distal end 22-2 constituting the super-slippery part 22-3. Alternatively, a separate super-slippery part 22-3 can be established at the distal end of the sheath tube 22, and installed at the distal end of the outer sheath tube 22 by heat sealing, bonding, or integral injection molding. When the bag body 31 is pulled into the outer sheath tube 22, the bag body 31 contacts the super-slippery part 22-3, without directly contacting the distal end disconnect 22-2. Because the super-slippery part 22-3 has a very low coefficient of friction, it can effectively reduce the movement resistance of the bag body 31, allowing the bag body 31 to be pulled into the outer sheath tube 22 more smoothly, effectively avoiding or reducing the risk of the bag body 31 being torn or damaged.

[0020] The distal port 22-2 of the outer sheath 22 is a smooth blunt tip 22-21. When the bag body 31 enters the distal port 22-2, it forms a surface contact to reduce the pressure at the contact point, thereby preventing the bag body 31 from being torn or damaged by a cutting action when it enters the distal port 22-2. The blunt tip 22-21 constitutes the anti-cutting mechanism 5, which can reduce the pressure at the contact point. The distal port 22-2 can be configured as a smooth blunt tip 22-21. When the bag body 31 is pulled into the outer sheath 22, a surface contact is formed between the bag body 31 and the blunt tip 22-21, reducing the pressure at the contact point. The bag body 31 slides into the outer sheath 22 along the surface of the blunt tip 22-21, avoiding the local increase in pressure caused by the stress concentration at the contact point due to the sharp edge formed at the existing planar end. This effectively avoids the sharp cutting action of the distal port 22-2, thereby effectively avoiding or reducing the risk of the bag body 31 being torn or damaged.

[0021] The bag body 31 is made of high-strength medical elastic material. The bag body 31 is made of medical elastic material, especially medical elastic film material, which has good strength to ensure the safety of the tissue removal process, and can be folded up and placed into the outer sheath tube 22 for easy insertion into the body.

[0022] The medical elastic material is a composite film, which is a composite film composed of nylon and thermoplastic polyurethane (TPU), or a composite film composed of polypropylene and thermoplastic polyurethane (TPU). To enhance the strength of the storage bag 3, the storage bag 3 is typically made of a medical composite material. The medical composite material is a composite film made of woven fabric and medical film. The applicant has only listed the composite material structure made of woven fabric and medical film here. Those skilled in the art can also choose composite materials made of various other materials, without departing from the scope of protection claimed in this application. The applicant has also only listed the above two composite materials for the composite film here. In practical applications, those skilled in the art can also choose other medical materials to form a composite film, without departing from the scope of protection of this application.

[0023] The opening device 4 is made of shape memory alloy. When the cut-resistant reinforced biological specimen recovery device of this invention enters the human body, the opening device 4 will automatically open under the action of body temperature, and the bag body 31 will automatically open the bag opening 31-1 under the action of the opening device 4, making the use process more convenient.

[0024] The opening device 4 and the tensioning device 32 are installed together in the installation channel 31-1 of the bag body 31. The installation channel 31-1 is usually located near the bag opening 31-3 of the bag body 31, which not only facilitates installation but also ensures that the bag opening 31-3 of the bag body 31 opens automatically.

[0025] This utility model discloses a cut-resistant reinforced biological specimen recovery device comprising a handle 1, a sheath 2, a storage bag 3, an opening device 4, and a cut-resistant mechanism 5. The sheath 2 comprises an inner sheath 21 and an outer sheath 22; the proximal end of the inner sheath 21 is connected to the connecting portion 11 of the handle 1, and the distal end of the inner sheath 21 is connected to the opening device 4. The storage bag 3 comprises a bag body 31, a tensioning device 32, and a traction device 33; the opening device 4 is mounted on the bag body 31, and the proximal end of the opening device 4 is connected to the distal end of the inner sheath 21; the tensioning device 32 passes through the installation channel 31-1 of the bag body 31, extends proximally to the proximal end of the inner sheath 21, and is exposed proximally to the outer sheath 22; the distal end of the traction device 33 is connected to the bag body 31, and the proximal end of the traction device 33 passes through the outer sheath 22 and is connected to the handle 1. The anti-cutting mechanism 5 is provided on the storage bag 3 and / or the outer sheath tube 22. The anti-cutting mechanism 5 can avoid or reduce the cutting action between the bag body 31 and the outer sheath tube 22 when the bag body 31 enters the outer sheath tube 22, so that during clinical use, the bag body 31 is not easily torn and damaged during the process of pulling the bag body 31 into or out of the outer sheath tube 22, making clinical use safer. Attached Figure Description

[0026] Figure 1 This is a perspective view of the bag of the cut-resistant reinforced biological specimen recovery device of this utility model when it is unfolded.

[0027] Figure 1-1 yes Figure 1 A partial sectional view.

[0028] Figure 1-2 yes Figure 1-1 Enlarged view of point A.

[0029] Figure 2 yes Figure 1 A three-dimensional view of the storage bag being pulled into the outer sheath.

[0030] Figure 3 yes Figure 1 Exploded view.

[0031] Figure 4 This is a perspective view of the cut-resistant reinforced biological specimen recovery device of this utility model, which includes an ultra-smooth blunt tip.

[0032] Figure 4-1 yes Figure 4 Enlarged view of point B.

[0033] In the above figure:

[0034] 100 is the cut-resistant reinforced biological specimen recovery device of this utility model.

[0035] 1 is the handle, 2 is the sheath, 3 is the storage bag, 4 is the opening device, and 5 is the anti-cutting mechanism.

[0036] 11 is the connecting part.

[0037] 21 is the inner sheath, 22 is the outer sheath; 22-1 is the working channel, 22-2 is the distal port, 22-3 is the super-slippery part, and 22-21 is the blunt end.

[0038] 31 is the bag body, 32 is the tightening device, 33 is the traction device, and 34 is the connection point; 31-1 is the installation channel, 31-2 is the near-end side, 31-3 is the bag opening, 33-1 is the traction belt, 33-11 is the pull line channel, and 33-12 is the connecting buckle.

[0039] 41 is an expansion mechanism.

[0040] β angle is the angle between the connection point and the axis of the outer sheath. Detailed Implementation

[0041] Example 1: Cut-resistant reinforced biological specimen recovery device of this utility model, including a cut-resistant mechanism for adjusting the direction of movement.

[0042] refer to Figures 1 to 3 The cut-resistant reinforced biological specimen recovery device of this embodiment includes a handle 1, a sheath 2, a storage bag 3, an opening device 4, and a cut-resistant mechanism 5.

[0043] refer to Figure 1 and Figure 1-1 The sheath 2 includes an inner sheath 21 and an outer sheath 22; the proximal end of the inner sheath 21 is connected to the connecting part 11 of the handle 1, and the distal end of the inner sheath 21 is connected to the opening device 4. The inner sheath 21 is built into the working channel 22-1 of the outer sheath 22 and can move back and forth along the axial direction of the working channel 22-1.

[0044] The storage bag 3 includes a bag body 31, a tensioning device 32, and a traction device 33.

[0045] The bag body 31 is made of high-strength medical elastic material. The bag body 31 is made of medical elastic material, especially medical elastic film material, which has good strength to ensure the safety of the tissue removal process, and can be folded up and placed into the outer sheath tube 22 for easy insertion into the body.

[0046] In this embodiment, the medical elastic material is a composite film, which is a composite film composed of nylon and thermoplastic polyurethane (TPU), or a composite film composed of polypropylene and thermoplastic polyurethane (TPU). To enhance the strength of the storage bag 3, the storage bag 3 is typically made of a medical composite material. The medical composite material is a composite film composed of woven fabric and medical film. The applicant has only listed the composite material structure composed of woven fabric and medical film here. Those skilled in the art can also select composite materials composed of various other materials, all without departing from the scope of protection claimed in this application. The applicant has also only listed the above two composite materials for the composite film here. In practical applications, those skilled in the art can also select other medical materials to form a composite film, all without departing from the scope of protection claimed in this application.

[0047] refer to Figure 1-1 and Figure 1-2 The bag body 31 is provided with an installation channel 31-1 near the bag opening 31-3. The expansion mechanism 41 of the opening device 4 is installed in the installation channel 31-1. The proximal end of the opening device 4 is connected to the distal end of the inner sheath tube 21.

[0048] In this embodiment, the traction device 33 is a traction belt 33-1. The traction belt 33-1 is made of a soft, high-strength textile, is strip-shaped, hollow, and has a drawstring channel 33-11. The tensioning device 32 passes through the mounting channel 31-1 of the bag body 31 and enters the drawstring channel 33-11 at both ends, protruding from the proximal end of the traction belt 33-1. The distal end of the traction belt 33-1 is connected to the bag body 31, and the proximal end of the traction belt 33-1 is provided with a connecting buckle 33-12. The traction belt 33-1 passes through the working channel 22-1 of the outer sheath tube 22 and is connected to the handle 1 through the connecting buckle 33-12.

[0049] This design, which places the installation channel 31-1 near the bag opening 31-3, not only facilitates installation but also ensures that the bag opening 31-3 of the bag body 31 opens automatically.

[0050] In this embodiment, the opening device 4 is made of shape memory alloy. When the cut-resistant reinforced biological specimen recovery device of this invention enters the human body, the opening device 4 will automatically open under the influence of body temperature. Under the action of the opening device 4, the bag opening 31-1 of the bag body 31 will automatically open, making the process more convenient.

[0051] Since the bag body 31 of the storage bag 3 is usually made of high-strength medical elastic material, it has a certain thickness to ensure its strength and leak-proof performance. To ensure the bag body 31 can open smoothly after entering the body cavity, it is usually in an unfolded state during storage. In clinical use, the bag body 31 is first pulled into the outer sheath 22. After entering the body cavity, the handle 1 is pushed distally to release the bag body 31 from the outer sheath 22 for use. To meet the requirements of minimally invasive procedures in clinical practice, the outer sheath 22 is usually made of a rigid, thin-walled tube to minimize the tube wall thickness, thereby reducing the outer diameter of the outer sheath 22 as much as possible. Therefore, the cross-section of the distal port 22-2 is a very narrow, flat end face. Because the bag body 31 is relatively thick, when the bag body 31 is pulled into the outer sheath tube 22, the bag body 31 is usually pulled into the outer sheath tube 22 in a relatively tight state. Since the cross-section of the distal port 22-2 is a very narrow flat end face, the bag body 31 blocking the distal port 22-2 is very likely to cut against the flat end face of the distal port 22-2. This cutting effect is more obvious when the bag body 31 is pulled inward at a fast speed. When the force generated by the cutting effect is greater than the tensile strength of the bag body 31, the bag body 31 may be torn and damaged, making it unusable.

[0052] In this embodiment, the anti-cutting mechanism 5 is specially provided. The anti-cutting mechanism 5 can be set on the storage bag 3 for cut protection, or it can be set at the far end of the outer sheath tube 22 to protect or enhance the bag body 31 when it enters the outer sheath tube 22, reduce the cutting action between the bag body 31 and the flat end face of the far end port 22-2, thereby avoiding or reducing the risk of the bag body 31 being torn.

[0053] In this embodiment, the anti-cutting mechanism 5 avoids or reduces the cutting effect between the bag body 31 and the outer sheath tube 22 when the bag body 31 enters the outer sheath tube 22 by adjusting the direction of movement.

[0054] The traction device 33 is made of high-strength polymer material. Its distal end extends downwards along the upper part of the proximal side 31-2 of the bag body 31 and forms a fixed connection with the proximal side 31-2. The proximal end of the traction device 33 passes through the working channel 22-1 of the outer sheath tube 22 and is fixed to the handle 1. After installation, the connection 34 between the traction device 33 and the bag body 31 forms an angle β with the axis of the outer sheath tube 22. When the traction device 33 pulls towards the proximal end, the connection 34 pulls the proximal side 31-2, causing the bag... The movement direction of the body 31 gradually approaches the axial direction of the outer sheath tube 22 until it moves along the axial direction. During the movement, due to the directional traction effect of the connection 34, when the bag body 31 is pulled into the outer sheath tube 22, the bag body 31 is not likely to converge or block at the distal port 22-2 of the outer sheath tube 22, causing excessive movement resistance, thereby avoiding the bag body 31 being cut by the distal port 22-2, resulting in tearing or damage. The specific movement direction adjustment capability of the connection 34 constitutes the anti-cutting mechanism 5 that can adjust the movement direction.

[0055] In this embodiment, the distal end of the traction strap 33-1 unfolds and extends from the upper part of the proximal side 31-2 of the bag body 31 to the bottom edge, wrapping around both sides from the outside of the proximal side 31-2, and then forming a fixed connection with the proximal side 31-2 by means of sewing, heat sealing, bonding, etc.

[0056] When the bag body 31 is pulled into the outer sheath tube 22, the handle 1 is pulled backward. The handle 1 drives the traction belt 33-1 to move towards the proximal end of the outer sheath tube 22. Since the distal end of the traction belt 33-1 and the proximal side 31-2 of the bag body 31 form a strip-shaped connection 34, the connection 34, under the action of external force, pulls the proximal side 31-2 of the bag body 31 towards the outer sheath tube 22. As the bag body 31 gradually moves towards the proximal end along the working channel 22-1 of the outer sheath tube 22, the direction of movement of the bag body 31 gradually approaches the axial direction of the outer sheath tube 22 until parallel movement occurs along the axial direction. This adjustment in the direction of movement makes it less likely that the bag 31 will converge and become blocked at the distal port 22-2 of the outer sheath tube 22, causing excessive resistance to movement. This effectively avoids or reduces the cutting effect of the bag 31 formed by the flat end face of the distal port 22-2, thereby preventing the bag 31 from being torn and damaged.

[0057] In particular, in this embodiment, since the traction strap 33-1 is made of high-strength textile, when the distal end of the traction strap 33-1 unfolds and wraps around both sides of the proximal side 31-2 of the bag body 31 and then sews it, the material of the direct contact part between the traction strap 33-1 and the distal port 22-2 of the outer sheath tube 22-1 changes from medical composite film to high-strength textile. Therefore, it can simultaneously isolate and protect the proximal side 31-2 of the bag body 31 and increase the strength of the contact part, which can further reduce the risk of the bag body 31 being torn.

[0058] Preferably, the β angle is greater than 90°. The preferred angle range of the β angle is between 100° and 120°. Within this angle range, it can ensure that the connection 34 plays a good role in traction and reversal of the movement direction of the bag 31, and also ensure a good depth difference between the bag and the outer sheath, thus ensuring good tissue retraction capacity during the operation.

[0059] The length of the connection 34 extending along the proximal side 31-2 is at least 1 cm. Typically, the length of the connection 34 extending along the proximal side 31-2 is 2 to 3 cm. This length ensures good traction while minimizing the volume increase caused by the connection 34, reducing the degree of blockage to the distal port 22-2, and controlling the movement resistance from increasing significantly.

[0060] refer to Figure 4 When in use, the handle 1 must first be pulled towards the proximal end, which will move the inner sheath 21 and the traction device 33 towards the proximal end, pulling the bag body 31 into the outer sheath 22. After entering the human body cavity, the handle 1 is then pushed towards the distal end, and the bag body 31 is pushed out of the outer sheath 22 and released before it can be used.

[0061] In this embodiment, due to the anti-cutting mechanism 5 formed by the connecting part 34 with directional traction, the connecting part 34 pulls the proximal side 31-2 of the bag body 31 towards the outer sheath tube 22 under the action of external force. As the bag body 31 gradually moves towards the proximal end along the working channel 22-1 of the outer sheath tube 22, the movement direction of the bag body 31 gradually approaches the axial direction of the outer sheath tube 22 until it moves parallel to the axial direction. This adjustment of the movement direction makes it less likely for the bag body 31 to converge and block at the distal port 22-2 of the outer sheath tube 22, causing excessive movement resistance. This effectively avoids or reduces the cutting effect of the bag body 31 formed by the flat end face of the distal port 22-2, thereby preventing the bag body 31 from being torn and damaged.

[0062] Example 2: A multi-mode combined cut-resistant reinforced biological specimen recovery device of this utility model

[0063] refer to Figure 4 and Figure 4-1 The difference between this embodiment and embodiment 1 is that, in this embodiment, the anti-cutting mechanism 5 further includes an ultra-slippery part 22-3 and a blunt head 22-21.

[0064] In addition to the anti-cutting method of adjusting the direction of movement described in Embodiment 1, this embodiment also includes anti-cutting methods that reduce movement resistance and reduce contact pressure, thus forming the combined anti-cutting mechanism 5.

[0065] In this embodiment, the outer sheath 22 is entirely made of a super-lubricating material, and the distal end 22-2 of the outer sheath 22 is a smooth, blunt tip 22-21. The blunt tip 22-21 made of super-lubricating material constitutes the super-lubricating portion 22-3.

[0066] When the bag body 31 is pulled into the outer sheath 22, it contacts the super-slippery part 22-3, but not directly with the distal disconnect 22-2. The super-slippery part 22-3, due to its very low coefficient of friction, effectively reduces the movement resistance of the bag body 31. Simultaneously, a surface contact is formed between the bag body 31 and the blunt end 22-21, reducing the pressure at the contact point. The bag body 31 slides along the surface of the blunt end 22-21 into the outer sheath 22, avoiding the localized pressure increase caused by stress concentration at the contact point due to localized line contact at the sharp edge formed at the existing planar end, thus effectively preventing the sharp cutting action of the distal end 22-2. The combined effect of the super-slippery part 22-3 reducing frictional resistance and the blunt end 22-21 reducing stress concentration at the contact point and lowering localized pressure more effectively avoids or reduces the risk of the bag body 31 being torn or damaged, making clinical use safer.

[0067] In this embodiment, the blunt end 22-21 of the distal port 22-2 also constitutes the super-slippery part 22-3. In practical applications, a separate super-slippery part 22-3 can also be set at the distal end of the sheath 22 and set at the distal end of the outer sheath 22 by means of heat sealing, bonding, integral injection molding, etc. The applicant will not give examples here, but none of them are outside the protection scope of this application.

[0068] In this embodiment, the anti-cutting mechanism 5 avoids or reduces the cutting effect between the bag body 31 and the outer sheath tube 22 when the bag body 31 enters the outer sheath tube 22 through the combined effect and superposition of three methods: adjusting the direction of movement, reducing the resistance of movement, and reducing the pressure at the contact point, which makes it safer in clinical use.

[0069] In this application, the applicant has only specifically illustrated the above three anti-cutting methods. In practical applications, those skilled in the art can design anti-cutting mechanisms 5 with different structures and methods according to actual needs. The applicant will not give examples of each one here, but none of them will depart from the protection scope of this application.

[0070] It should be noted that the structures disclosed and described herein can be replaced by other structures with the same effect, and the embodiments described herein are not the only structures for implementing this utility model. Although preferred embodiments of this utility model have been described and illustrated herein, those skilled in the art will understand that these embodiments are merely illustrative, and those skilled in the art can make numerous variations, improvements, and substitutions without departing from this utility model. Therefore, the scope of protection of this utility model should be defined in accordance with the spirit and scope of the appended claims.

Claims

1. A cut-resistant reinforced biological specimen recovery device (100), comprising a handle (1), a sheath (2), a storage bag (3), an opening device (4), and a cut-resistant mechanism (5), characterized in that: A. The sheath (2) includes an inner sheath (21) and an outer sheath (22); the proximal end of the inner sheath (21) is connected to the connecting part (11) of the handle (1), and the distal end of the inner sheath (21) is connected to the opening device (4); B. The storage bag (3) includes a bag body (31), a tensioning device (32), and a traction device (33); the opening device (4) is installed on the bag body (31), and the proximal end of the opening device (4) is connected to the distal end of the inner sheath (21); the tensioning device (32) extends from the proximal end of the inner sheath (21) through the mounting channel (31-1) of the bag body (31) and is exposed from the proximal end of the outer sheath (22); the distal end of the traction device (33) is connected to the bag body (31), and the proximal end of the traction device (33) is connected to the handle (1) after passing through the outer sheath (22); C. The anti-cutting mechanism (5) is provided on the storage bag (3) and / or the outer sheath tube (22). The anti-cutting mechanism (5) can avoid or reduce the cutting action between the bag body (31) and the outer sheath tube (22) when the bag body (31) enters the outer sheath tube (22). D. When using, the handle (1) must be pulled towards the proximal end first, which will drive the inner sheath (21) and the traction device (33) to move towards the proximal end, and the bag (31) will be pulled into the outer sheath (22). After entering the human body cavity, the handle (1) is pushed towards the distal end, and the bag (31) is pushed out of the outer sheath (22) and released before it can be used. Therefore, the anti-cutting mechanism (5) makes it less likely that the bag (31) will be torn or damaged during the process of pulling the bag (31) into or out of the outer sheath (22) during clinical use.

2. The cut-resistant reinforced biological specimen recovery device according to claim 1, characterized in that: The anti-cutting mechanism (5) avoids or reduces the cutting action between the bag body (31) and the outer sheath tube (22) when the bag body (31) enters the outer sheath tube (22) by adjusting the direction of movement and / or reducing the resistance of movement and / or reducing the pressure at the contact point.

3. The cut-resistant reinforced biological specimen recovery device according to claim 2, characterized in that: The traction device (33) is made of high-strength polymer material. Its distal end extends downward along the upper part of the proximal side (31-2) of the bag body (31) and forms a fixed connection with the proximal side (31-2). The proximal end of the traction device (33) passes through the working channel (22-1) of the outer sheath tube (22) and is fixed on the handle (1). After installation, the connection (34) between the traction device (33) and the bag body (31) forms an angle β with the axis of the outer sheath tube (22). When the traction device (33) pulls towards the proximal end, the connection (34) pulls the proximal side (31-2), causing... The movement direction of the bag (31) gradually approaches the axial direction of the outer sheath (22) until it moves along the axial direction. During the movement, due to the directional traction of the connection (34), when the bag (31) is pulled into the outer sheath (22), the bag (31) is not easy to gather and block at the far end port (22-2) of the outer sheath (22), causing excessive movement resistance, thereby avoiding the bag (31) being cut by the far end port (22-2) and resulting in tearing or damage. The specific movement direction adjustment capability of the connection (34) constitutes the anti-cutting mechanism (5) that can adjust the movement direction.

4. The cut-resistant reinforced biological specimen recovery device according to claim 3, characterized in that: The β angle is greater than 90°.

5. The cut-resistant reinforced biological specimen recovery device according to claim 3, characterized in that: The connection (34) extends at least 1 cm along the proximal side (31-2).

6. The cut-resistant reinforced biological specimen recovery device according to claim 2, characterized in that: The anti-cutting mechanism (5) is a super-slippery part (22-3) provided at the far end of the outer sheath tube (22) to reduce the movement resistance of the bag body (31) when it enters the outer sheath tube (22) and prevent the bag body (31) from being torn or damaged.

7. The cut-resistant reinforced biological specimen recovery device according to claim 2, characterized in that: The distal port (22-2) of the outer sheath (22) is a smooth blunt tip (22-21). When the bag body (31) enters the distal port (22-2), it forms a surface contact to reduce the contact pressure, thereby preventing the bag body (31) from being torn or damaged by a cutting action when it enters the distal port (22-2). The blunt tip (22-21) constitutes the anti-cutting mechanism (5) that can reduce the contact pressure.

8. The cut-resistant reinforced biological specimen recovery device according to claim 1, characterized in that: The bag (31) is made of high-strength medical elastic material.

9. The cut-resistant reinforced biological specimen recovery device according to claim 8, characterized in that: The medical elastic material is a composite film, which is a composite film composed of nylon and thermoplastic polyurethane (TPU), or a composite film composed of polypropylene and thermoplastic polyurethane (TPU).

10. The cut-resistant reinforced biological specimen recovery device according to claim 1, characterized in that: The opening device (4) is made of shape memory alloy.

11. The cut-resistant reinforced biological specimen recovery device according to claim 1, characterized in that: The opening device (4) and the tensioning device (32) are installed together in the installation channel (31-1) of the bag body (31).

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