Tissue excision device

Abstract

The utility model belongs to the technical field of medical instruments, and discloses a tissue resection device which comprises a pushing catheter, a first snare wire and a second snare wire, the first snare wire and the second snare wire penetrate through the pushing catheter, the two near ends of the first snare wire extend out of the near end of the pushing catheter, and the two near ends of the second snare wire extend out of the near end of the pushing catheter. The first snare wire forms a cutting ring outside the far end of the pushing catheter; the two near ends of the second snare wire extend out of the near end of the pushing catheter, and the second snare wire forms a fixing ring outside the far end of the pushing catheter. According to the tissue resection device, the tissue is tightened through the fixing ring, the effect of pulling the tissue is achieved, the form of the tissue can be stabilized, cutting of the tissue by the cutting ring is facilitated, the tissue cutting speed is effectively increased, operation wounds and operation time are reduced, and operation risks are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a tissue removal device. Background Art

[0002] Long-term implantation of access catheters, such as CUFF tunneled catheters and PICC catheters, can cause venous thrombosis, vascular adhesions, and fibrin sheaths. The fibrin sheath can adhere to the vein wall, leading to catheter obstruction or difficulty in extubation.

[0003] Clinically, catheter removal is usually performed by cutting the adhesion vein or by interventional surgery to remove the fibrin sheath. Cutting the adhesion vein is surgically invasive and carries high surgical risk. During interventional surgery, the fibrin sheath is unstable, resulting in low cutting efficiency, increased surgical time, and increased surgical risk. Utility Model Content

[0004] The purpose of the utility model is to provide a tissue resection device, which can effectively reduce surgical trauma and surgical time, and lower surgical risks.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A tissue resection device is provided, comprising:

[0007] Push catheter;

[0008] a first snare wire, which is passed through the push catheter, and the two proximal ends of the first snare wire extend out of the proximal end of the push catheter; a cutting ring is formed on the distal end of the first snare wire, and the cutting ring is used to snare and cut tissue;

[0009] The second snare wire is passed through the push catheter, and the two proximal ends of the second snare wire extend out of the proximal end of the push catheter. The second snare wire forms a fixing ring outside the distal end of the push catheter, and the fixing ring is used to snare and tighten tissue.

[0010] Optionally, the pushing catheter includes a first pushing channel and a second pushing channel;

[0011] Wherein, the first pushing channel runs through both ends of the pushing catheter, and the first snare wire is passed through the first pushing channel;

[0012] The second pushing channel passes through both ends of the pushing catheter, and the second snare wire is passed through the second pushing channel.

[0013] Optionally, the distal end of the pushing catheter includes a first distal end surface and a second distal end surface, and the first distal end surface and the second distal end surface are sequentially spaced from the distal end to the proximal end along the axial direction of the pushing catheter;

[0014] Wherein, the first pushing channel passes through the first distal end surface, and the second pushing channel passes through the second distal end surface;

[0015] Or the first pushing channel passes through the second distal end surface, and the second pushing channel passes through the first distal end surface.

[0016] Optionally, the first pushing channel includes a first main channel and two first branch channels that are interconnected, the first main channel passes through the distal end of the pushing catheter, the first branch channels pass through the proximal end of the pushing catheter, and the two proximal ends of the first snare wire extend out of the two first branch channels in a one-to-one correspondence;

[0017] And / or, the second push channel includes a second main channel and two second branch channels that are interconnected, the second main channel passes through the distal end of the push catheter, the second branch channel passes through the proximal end of the push catheter, and the two proximal ends of the second snare wire extend out of the two second branch channels in a one-to-one correspondence.

[0018] Optionally, the push catheter includes an exhaust channel for accommodating the excised tissue.

[0019] Optionally, the proximal end of the pushing catheter is connected to a handle, and the handle includes a first connector communicating with the discharge channel.

[0020] Optionally, a clearance groove is provided on the fixing ring, the fixing ring is sleeved on the first snare wire, and the clearance groove can accommodate the first snare wire.

[0021] Optionally, a cutting wire is spirally wound on the cutting ring.

[0022] Optionally, the cutting wire is made of platinum-tungsten alloy.

[0023] Optionally, the cross-sectional shape of the cutting wire is set to be a triangle.

[0024] Beneficial effects of the utility model:

[0025] When using the tissue resection device provided by the present invention, the push catheter is first pushed to the tissue to be resected, and the cutting loop is looped around the end of the tissue, while the fixing loop is looped around the head of the tissue. The two proximal ends of the second loop wire are then pulled to tighten the fixing loop and constrict the tissue. Finally, the two proximal ends of the first loop wire are pulled to tighten the cutting loop and cut the tissue, completing the resection. The tightening of the tissue by the fixing loop has the effect of pulling the tissue, stabilizing the tissue morphology, facilitating the cutting of the tissue by the cutting loop, and effectively accelerating the speed of tissue resection, thereby reducing surgical trauma, surgical time, and surgical risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a simplified structural diagram of the tissue resection device provided by the present invention;

[0027] Figure 2 This is a structural diagram of the positional relationship between the first and second loops of wire provided by the present invention when cutting tissue;

[0028] Figure 3 This is a schematic structural diagram of the push catheter provided by the utility model;

[0029] Figure 4 This is a partial schematic diagram of an embodiment of a push catheter provided by the present utility model;

[0030] Figure 5 The utility model provides Figure 3 Cross-sectional view along the AA axis;

[0031] Figure 6 This is a structural diagram of the positional relationship between the first loop of wire and the second loop of wire provided by the utility model;

[0032] Figure 7 This is a schematic structural diagram of the first loop of wire provided by the utility model;

[0033] Figure 8 It is a structural schematic diagram of the second loop of wire provided by the utility model.

[0034] In the picture:

[0035] 10. Tissue; 20. Access catheter; 30. Blood vessel;

[0036] 100, push catheter; 101, first distal end surface; 102, second distal end surface; 110, first push channel; 111, first main channel; 112, first branch channel; 120, second push channel; 121, second main channel; 122, second branch channel; 130, discharge channel;

[0037] 200, first loop of thread; 210, cutting ring;

[0038] 300, second loop of thread; 310, fixing ring; 311, clearance groove;

[0039] 400, handle; 410, first connector;

[0040] 500, cutting wire. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0042] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0043] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0044] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0045] Reference Figures 1 to 8 As shown, this embodiment provides a tissue resection device, which includes a push catheter 100 , a first snare wire 200 and a second snare wire 300 .

[0046] Specifically, the first snare wire 200 and the second snare wire 300 are both inserted into the delivery catheter 100. The proximal ends of the first snare wire 200 extend beyond the proximal end of the delivery catheter 100. A cutting ring 210 is formed on the distal end of the first snare wire 200, which is used to snare and cut tissue 10. The proximal ends of the second snare wire 300 extend beyond the proximal end of the delivery catheter 100. A fixing ring 310 is formed on the distal end of the second snare wire 300, which is used to snare and tighten tissue 10. It is understood that the distal end of the delivery catheter 100 refers to the end that extends into the patient's body during surgery, and the proximal end of the delivery catheter 100 refers to the end opposite the distal end. In addition, the definitions of the proximal and distal ends of other components in this embodiment are the same as those of the delivery catheter 100, and will not be further elaborated in this application.

[0047] For example, during surgical use, the push catheter 100 is first advanced to the tissue 10 to be resected. The cutting loop 210 is then encircled around the distal end of the tissue 10, while the retaining loop 310 is encircled around the distal end of the tissue 10. The proximal ends of the second snare wire 300 are then pulled to tighten and constrict the retaining loop 310. Finally, the proximal ends of the first snare wire 200 are pulled to tighten and cut the tissue 10, completing the cut. The tightening of the tissue 10 by the retaining loop 310 provides a pulling effect, stabilizing the tissue 10 shape and facilitating the cutting of the tissue 10 by the cutting loop 210. This effectively speeds up the cutting process, thereby reducing surgical trauma, surgical time, and risk. It should be understood that the distal end of the tissue 10 refers to the end of the push catheter 100 facing the push catheter 100 when inserted into the patient's body, while the distal end of the tissue 10 refers to the end opposite the distal end. The tissue 10 cut by the tissue resection device may be a fibrin sheath. In addition, when the cutting ring 210 cuts the tissue 10 , the second snare wire 300 can be pulled at the same time, which is more conducive to the cutting and separation of the tissue 10 .

[0048] Exemplarily, the material of the first snare wire 200 includes but is not limited to nickel-titanium alloy.

[0049] Illustratively, the cross-sectional shape of the first snare wire 200 includes, but is not limited to, a triangle, a circle, or a diamond.

[0050] For example, when the cross-section of the first snare wire 200 is circular, the diameter of the first snare wire 200 may be 0.2 mm to 0.5 mm, such as 0.3 mm, 0.305 mm, or 0.31 mm. When the cross-section of the first snare wire 200 is another shape, the diameter of the inscribed circle of the cross-section of the first snare wire 200 may be 0.2 mm to 0.5 mm, such as 0.3 mm, 0.305 mm, or 0.31 mm.

[0051] Exemplarily, the material of the second snare wire 300 includes but is not limited to nickel-titanium alloy.

[0052] Illustratively, the cross-sectional shape of the second snare wire 300 includes, but is not limited to, a triangle, a circle, or a diamond.

[0053] For example, when the cross-section of the second snare wire 300 is circular, the diameter of the second snare wire 300 can be 0.2 mm to 0.5 mm, such as 0.3 mm, 0.305 mm, or 0.31 mm. When the cross-section of the second snare wire 300 is another shape, the diameter of the inscribed circle of the cross-section of the second snare wire 300 can be 0.2 mm to 0.5 mm, such as 0.3 mm, 0.305 mm, or 0.31 mm.

[0054] In one possible implementation, Figure 7 As shown, a cutting wire 500 is spirally wound on the cutting ring 210 . The cutting wire 500 can serve as a cutting blade of the cutting ring 210 , which is beneficial for cutting the tissue 10 and effectively speeds up the cutting speed of the tissue 10 .

[0055] Illustratively, the material of the cutting wire 500 includes but is not limited to platinum-tungsten alloy, which has a developing effect and is more convenient for positioning and cutting the tissue 10 .

[0056] For example, the cross-sectional shape of the cutting wire 500 can be an edged shape, such as a triangle or a diamond, which is more conducive to cutting the tissue 10 and effectively speeds up the cutting of the tissue 10. Of course, the cross-sectional shape of the cutting wire 500 can also be a circle or other shape, which is not limited in this application. Compared to a circular cutting wire 500, the edged cutting wire 500 has a smaller cutting angle, a greater cutting force, and a stronger cutting ability.

[0057] For example, when the cross-sectional shape of the cutting wire 500 is circular, the diameter of the cutting wire 500 can be 0.02 mm to 0.05 mm, such as 0.032 mm, 0.035 mm, or 0.038 mm. When the cross-sectional shape of the cutting wire 500 is other shapes, the diameter of the inscribed circle of the cross-sectional shape of the cutting wire 500 can be 0.02 mm to 0.05 mm, such as 0.032 mm, 0.035 mm, or 0.038 mm.

[0058] For example, the connection between the cutting wire 500 and the cutting ring 210 includes, but is not limited to, welding or gluing. Optionally, the distance between the glue points or welding points between the cutting wire 500 and the cutting ring 210 can be 0.1 mm to 0.5 mm.

[0059] In this embodiment, referring to Figures 3 to 5As shown, the push catheter 100 includes a first push channel 110 and a second push channel 120. The first push channel 110 runs through both ends of the push catheter 100, and the first snare wire 200 is inserted into the first push channel 110. The second push channel 120 runs through both ends of the push catheter 100, and the second snare wire 300 is inserted into the second push channel 120. In this embodiment, the first push channel 110 and the second push channel 120 separate the first snare wire 200 and the second snare wire 300, effectively preventing entanglement between the first snare wire 200 and the second snare wire 300 and facilitating identification operations.

[0060] In a feasible embodiment, the distal end of the pushing catheter 100 is set in a stepped structure, and the distal end of the pushing catheter 100 includes a first distal end surface 101 and a second distal end surface 102. The first distal end surface 101 and the second distal end surface 102 are arranged in sequence from the distal end to the proximal end along the axial direction of the pushing catheter 100.

[0061] In some embodiments, the first pushing channel 110 extends through the first distal surface 101, and the second pushing channel 120 extends through the second distal surface 102. During surgery, the first distal surface 101 is closer to the end of the tissue 10 than the second distal surface 102, so that the cutting ring 210 can better snare the end of the tissue 10 and the cut tissue 10 is more complete.

[0062] In other embodiments, the first pushing channel 110 extends through the second distal surface 102, and the second pushing channel 120 extends through the first distal surface 101. During surgery, the first distal surface 101 is closer to the end of the tissue 10 than the second distal surface 102, so that the position where the fixing ring 310 entangles the tissue 10 can be closer to the end of the tissue 10. In other words, the distance between the fixing ring 310 and the cutting ring 210 is shortened, the effect of pulling the tissue 10 is better, the shape of the tissue 10 is more stable, and it is more convenient for the cutting ring 210 to cut the tissue 10.

[0063] In some embodiments, the first push channel 110 is a single-channel structure to facilitate the molding of the push catheter 100. In other embodiments, the first push channel 110 includes a first main channel 111 and two first branch channels 112 that are interconnected, the first main channel 111 passing through the distal end of the push catheter 100, the first branch channels 112 passing through the proximal end of the push catheter 100, and the two proximal ends of the first snare wire 200 extend out of the two first branch channels 112 in a one-to-one correspondence, so as to prevent the two proximal ends of the first snare wire 200 from being entangled with each other in the first push channel 110, and to achieve the operation of pulling the two proximal ends of the first snare wire 200 separately, making it more convenient to adjust the position of the cutting ring 210 and more conducive to cutting the tissue 10 by the cutting ring 210.

[0064] In some embodiments, the second push channel 120 is a single-channel structure to facilitate the molding of the push catheter 100. In other embodiments, the second push channel 120 includes a second main channel 121 and two second branch channels 122 that are interconnected, the second main channel 121 is arranged to pass through the distal end of the push catheter 100, and the second branch channels 122 are arranged to pass through the proximal end of the push catheter 100, and the two proximal ends of the second snare wire 300 extend out of the two second branch channels 122 in a one-to-one correspondence, so as to prevent the two proximal ends of the second snare wire 300 from being entangled with each other in the first push channel 110, and to achieve the operation of pulling the two proximal ends of the second snare wire 300 separately, making it more convenient to adjust the position of the fixing ring 310, and the fixing ring 310 has a better effect of tightening the tissue 10.

[0065] In one possible implementation, Figure 6 As shown, the fixing ring 310 is provided with a clearance groove 311. The fixing ring 310 is positioned over the first snare wire 200, and the clearance groove 311 can accommodate the first snare wire 200. In this embodiment, the fixing ring 310 is positioned over the first snare wire 200, and the first snare wire 200 does not interfere with the fixing ring 310 entrapping the tissue 10. The provision of the clearance groove 311 can also reduce the compression of the first snare wire 200 by the fixing ring 310 and the tissue 10, allowing the two proximal ends of the first snare wire 200 to be pulled more effortlessly to complete the cutting of the tissue 10. Of course, the fixing ring 310 can also be provided without the clearance groove 311, and the first snare wire 200 can be positioned outside the fixing ring 310.

[0066] In this embodiment, referring to Figure 1 and Figure 3 As shown, the push catheter 100 includes a discharge channel 130, which is used to accommodate the excised tissue 10, that is, the excised tissue 10 can be discharged from the body through the suction catheter to ensure the safety of the patient.

[0067] In a feasible embodiment, the proximal end of the push catheter 100 is connected to a handle 400, and the handle 400 includes a first connector 410 connected to the discharge channel 130. A suction device can be connected through the first connector 410 to extract the excised tissue 10 from the human body safely and reliably.

[0068] Specifically, the handle 400 may include a first drive device (not shown) connected to the first snare wire 200 and a second drive device (not shown) connected to the second snare wire 300, so as to facilitate the fixing ring 310 to tighten the tissue 10 and the cutting ring 210 to cut the tissue 10. The first drive device and the second drive device may be slider structures, and the first snare wire 200 and the second snare wire 300 are pulled or pushed in a one-to-one correspondence by the movement of the two sliders relative to the handle 400. Of course, the first drive device and the second drive device may also be knob structures or other structures, which are not limited in this application.

[0069] For example, Figure 2 Taking the fibrin sheath on the access catheter 20 in the blood vessel 30 as an example, before surgery, the fixing ring 310 and the cutting ring 210 can be located in the push catheter 100, and the method of using the tissue removal device is as follows:

[0070] First, a guide wire (not shown) is pushed to the vicinity of the fibrin sheath, and then the push catheter 100 is advanced to the vicinity of the fibrin sheath along the guide wire.

[0071] Next, the first snare wire 200 is pushed forward, or the pushing catheter 100 is withdrawn, so that the cutting ring 210 extends out of the pushing catheter 100 , and the position of the pushing catheter 100 is adjusted so that the cutting ring 210 is snare-wrapped on the end of the fibrin sheath.

[0072] Then, the second snare wire 300 is pushed to allow the fixing ring 310 to be hooked onto the head end of the fibrin sheath, and the second snare wire 300 is pulled to allow the fixing ring 310 to tighten the fibrin sheath.

[0073] Finally, the first snare wire 200 is pulled, and the cutting ring 210 cooperates with the cutting wire 500 to remove the fibrin sheath by utilizing the radial contraction force and the pullback force generated during the pulling. The second snare wire 300 can be pulled simultaneously with the first snare wire 200 to further separate the fibrin sheath from the access catheter 20.

[0074] The separated fibrin sheath, debris and other emboli will be discharged from the body through the discharge channel 130 along the direction of blood flow, or be sucked out through the discharge channel 130 by a suction device.

[0075] The entire process can be completed under an X-ray imaging system.

[0076] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A tissue resection device, characterized in that: include: Push catheter (100); A first snare wire (200) is passed through the push catheter (100), and the two proximal ends of the first snare wire (200) extend out of the proximal end of the push catheter (100). The first snare wire (200) is formed with a cutting ring (210) outside the distal end of the push catheter (100), and the cutting ring (210) is used to snare and cut the tissue (10); The second snare wire (300) is passed through the push catheter (100), and the two proximal ends of the second snare wire (300) extend out of the proximal end of the push catheter (100). The second snare wire (300) is formed with a fixing ring (310) outside the distal end of the push catheter (100), and the fixing ring (310) is used to snare and tighten the tissue (10).

2. The tissue resection device according to claim 1, wherein: The pushing catheter (100) comprises a first pushing channel (110) and a second pushing channel (120); Wherein, the first pushing channel (110) passes through both ends of the pushing catheter (100), and the first snare wire (200) is passed through the first pushing channel (110); The second pushing channel (120) passes through both ends of the pushing catheter (100), and the second snare wire (300) is passed through the second pushing channel (120).

3. The tissue resection device according to claim 2, wherein: The distal end of the push catheter (100) comprises a first distal end surface (101) and a second distal end surface (102), wherein the first distal end surface (101) and the second distal end surface (102) are sequentially spaced from the distal end to the proximal end along the axial direction of the push catheter (100); Wherein, the first pushing channel (110) passes through the first distal end surface (101), and the second pushing channel (120) passes through the second distal end surface (102); Or the first pushing channel (110) passes through the second distal end surface (102), and the second pushing channel (120) passes through the first distal end surface (101).

4. The tissue resection device according to claim 2, wherein: The first pushing channel (110) includes a first main channel (111) and two first branch channels (112) that are interconnected, the first main channel (111) passing through the distal end of the pushing catheter (100), the first branch channels (112) passing through the proximal end of the pushing catheter (100), and the two proximal ends of the first snare wire (200) extend out of the two first branch channels (112) in a one-to-one correspondence; And / or, the second pushing channel (120) includes a second main channel (121) and two second branch channels (122) that are interconnected, the second main channel (121) passes through the distal end of the pushing catheter (100), the second branch channel (122) passes through the proximal end of the pushing catheter (100), and the two proximal ends of the second snare wire (300) extend out of the two second branch channels (122) in a one-to-one correspondence.

5. The tissue resection device according to claim 1, wherein: The push catheter (100) includes an exhaust channel (130) for receiving the excised tissue (10).

6. The tissue resection device according to claim 5, characterized in that: The proximal end of the pushing catheter (100) is connected to a handle (400), and the handle (400) includes a first connector (410) in communication with the discharge channel (130).

7. The tissue resection device according to claim 1, wherein: The fixing ring (310) is provided with a clearance groove (311), the fixing ring (310) is sleeved on the first snare wire (200), and the clearance groove (311) can accommodate the first snare wire (200).

8. The tissue resection device according to any one of claims 1 to 7, characterized in that: A cutting wire (500) is spirally wound on the cutting ring (210).

9. The tissue resection device according to claim 8, characterized in that: The cutting wire (500) is made of platinum-tungsten alloy.

10. The tissue resection device according to claim 8, wherein: The cross-sectional shape of the cutting wire (500) is set to be a triangle.

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