An anal dilating trocar for natural orifice specimen retrieval

Abstract

This invention proposes an anal dilator for specimen retrieval in natural cavities, belonging to the field of laparoscopic surgical instruments. Through the design of a conical section, gripper, second rod, sealing plate, mounting plate, connecting rod, baffle, hinge seat, stop bar, mounting ring, and threaded cap, the gripper can be pulled back and forth to bring the conical section closer to the center or open, thereby changing the diameter of the guide tube's guiding end. This allows it to adapt to different anal sizes and specimen volumes from different patients, avoiding the limitations of traditional fixed-diameter dilators. The gripper employs a bearing-connected double-rod design; rotation of the first rod does not affect rotation of the second rod, preventing guide tube rotation during adjustment and improving operational stability and precision. Furthermore, graduations are provided on the side wall of the outer cannula, facilitating precise control of the insertion depth by the surgeon and preventing excessive insertion that could damage the intestinal wall.

Description

Technical Field

[0001] This invention belongs to the field of laparoscopic surgical aids, specifically relating to an anal dilator cannula for taking specimens from natural cavities. Background Technology

[0002] With the rapid development of laparoscopic minimally invasive techniques, natural orifice scalpel surgery (NOSES) has been widely adopted and applied in colorectal surgery due to its core advantages, including no auxiliary abdominal incisions, minimal trauma, less postoperative pain, faster recovery, and better abdominal wall aesthetics. Transanal scalpel retrieval is the most common approach for colorectal NOSES, and the anal dilator is an indispensable core instrument in this type of surgery; its performance directly determines the convenience, safety, and incidence of postoperative complications. Chinese patent CN103948404A describes a face-assisted incision anal cannula that enables specimen retrieval through the natural anal canal using a simple structure consisting of an outer cannula, a guide tube, a threaded rear cover, and a mechanical port cover. Chinese patent CN111529017B describes an anal dilator cannula for retrieval through the natural anal canal, which employs an elastic one-way valve and a conical elastomer double-layer sealing structure, completely solving the air leakage problem of the threaded seal and eliminating the need for the threaded rear cover and instrument port cover, thus eliminating the need for screwing on the caps during all operations. However, existing technologies such as the anal dilators commonly used in clinical practice have the following significant drawbacks: they are mostly made of hard metal or plastic, with a fixed inner diameter for dilation, making it impossible to precisely adjust according to the size of the specimen. This can easily cause sphincter damage in patients with tight anuses, and makes it difficult to remove larger specimens smoothly. In view of the shortcomings of the existing technology, there is an urgent need to develop an anal dilator that is specifically adapted to colorectal NOSES surgery, has an adjustable dilation diameter, and is easy to operate. Summary of the Invention

[0003] This invention addresses the problems of the prior art by providing an anal dilator cannula for obtaining specimens from natural cavities.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: An anal dilator cannula for obtaining specimens from natural cavities includes an outer cannula and a guide tube inserted within the outer cannula. The inner end of the guide tube has a cone and the proximal end has a gripper, the proximal end of which protrudes from the proximal end of the outer cannula. The other end of the gripper is fixedly connected to a mounting plate, and the other end of the mounting plate is fixedly connected to the cone via at least two connecting rods in a one-to-one correspondence. A baffle is slidably connected to the side of the connecting rod near the cone, and a hinge seat is fixedly provided on the distal side of the baffle corresponding to the cone, the hinge seat being hinged to the cone. The cone protrudes from the inner end of the outer cannula.

[0005] Preferably, the outer sheath is integrally formed from the proximal external segment, the middle anal canal adhering segment, and the short intestinal segment; the hollow cavity connecting the proximal external segment, the middle anal canal adhering segment, and the short intestinal segment forms a through main channel for specimen retrieval.

[0006] Preferably, the gripper includes a first rod and a second rod. The first rod extends from the near end of the outer sleeve and is rotatably connected by a bearing. A mounting plate is fixedly connected to the far end of the second rod. A sealing plate is threadedly connected to the side of the first rod and is in close contact with the inner wall of the outer sleeve.

[0007] Preferably, a stop bar is fixedly connected to the middle of the connecting rod; a mounting ring is fixedly connected to the near surface of the baffle via mounting rods that correspond one-to-one with the connecting rods, and the far surface of the mounting ring can contact the near surface of the stop bar.

[0008] Preferably, the outer sleeve has graduations on its sidewall.

[0009] Preferably, the gripper is slidably sealed with a threaded cap on its proximal side, and the threaded cap is threadedly installed to seal the outer side of the proximal end of the outer sleeve.

[0010] Compared with the prior art, the advantages and positive effects of the present invention are as follows: This application discloses an anal dilator for specimen retrieval from natural orifices. Through the arrangement of a conical section, a gripper, a second rod, a sealing plate, a mounting plate, a connecting rod, a baffle, a hinged seat, a stop rod, a mounting ring, and a threaded cap, the gripper can be pulled back and forth to bring the conical section closer to the center or open, thereby changing the diameter of the guide tube's guiding end. This allows it to adapt to different anal sizes and specimen volumes from different patients, avoiding the limitations of traditional fixed-diameter dilators. The gripper employs a bearing-connected double-rod design; rotation of the first rod does not affect rotation of the second rod, preventing the guide tube from rotating during adjustment and improving operational stability and precision. Furthermore, graduations are provided on the side wall of the outer cannula, facilitating precise control of the insertion depth by the physician and preventing excessive insertion that could damage the intestinal wall. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is one of the structural schematic diagrams of the present invention; Figure 2 This is a second structural schematic diagram of the present invention; Figure 3 The third schematic diagram of the structure of the present invention; Figure 4 This is a left cross-sectional view of the structural schematic diagram of the present invention; Figure 5 for Figure 4 A magnified view of a section at point A in the middle; Figure 6 This is a schematic diagram of the guide tube of the present invention; In the above figures, 1. Outer tube; 2. Guide tube; 11. Proximal external segment; 12. Mid-section anal canal apposition segment; 13. Short internal segment; 14. Main passage for specimen retrieval; 15. Scale; 21. Cone; 22. Handle; 222. Second rod; 223. Sealing plate; 23. Mounting plate; 24. Connecting rod; 25. Baffle; 26. Hinge seat; 27. Stop bar; 28. Mounting ring; 29. ​​Threaded cap. Detailed Implementation

[0013] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0014] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0015] Example 1, such as Figures 1-5 As shown, an anal dilator cannula for obtaining specimens from natural cavities according to this application includes an outer tube 1 and a guide tube 2 fitted inside the outer tube 1. The inner end of the guide tube 2 is provided with a cone 21 and the proximal end is provided with a gripper 22. The proximal end of the gripper 22 extends out from the proximal end of the outer tube 1. The other end of the gripper 22 is fixedly connected to a mounting plate 23. The other end of the mounting plate 23 is fixedly connected to the cone 21 through at least two connecting rods 24 in a one-to-one correspondence. In this application, four connecting rods 24 are arranged symmetrically at the center. A baffle 25 is slidably connected to the side of the connecting rod 24 near the cone 21. A hinge seat 26 is fixedly provided on the far side of the baffle 25, corresponding to the cone 21. The hinge seat 26 is hinged to the cone 21. In this application, the cone 21 is a gyroscope-shaped block including a portion of the axis. The angle of the cone 21's top view section is 45°. The cone 21 extends out from the inner end of the outer sleeve 1. In use, the gripper 22 is pulled back and forth to make the cone 21 move closer to the center or open. The size of the guide end of the guide tube 2 can be changed to adapt to different anal volumes. The outer sheath 1 is integrally formed from the proximal external segment 11, the middle anal canal fitting segment 12, and the short intestinal internal segment 13. The hollow cavity connecting the proximal external segment 11, the middle anal canal fitting segment 12, and the short intestinal internal segment 13 forms a through specimen retrieval main channel 14. In this application, the outer sheath 1 is integrally formed from medical-grade flexible silicone with a Shore A hardness of 40A, possessing both good radial support and axial flexible deformation capability, which can adaptively fit the physiological curvature of the anal canal and reduce pressure on the anal sphincter. The basic inner diameter of the specimen retrieval main channel 14 is 20mm. The outer wall of the middle anal canal fitting segment 12 is provided with an arc-shaped transition surface that adapts to the physiological curvature of the human anal canal, improving tissue fit. The inner wall of the specimen retrieval main channel 14 is provided with a medical-grade hydrophilic super-slippery coating with a friction coefficient ≤0.05, significantly reducing specimen retrieval resistance. The gripper 22 includes a first rod 221 and a second rod 222. The first rod 221 extends from the near end of the outer sleeve 1 and is rotatably connected to the second rod 222 via a bearing. A mounting plate 23 is fixedly connected to the far end of the second rod 222. A sealing plate 223 is threadedly connected to the side of the first rod 221 and is in close contact with the inner wall of the outer sleeve 1. Specifically, during installation, the sealing plate 223 and the first rod 221 are pre-tightened and inserted into the outer sleeve 1. Then, the sealing plate 223 and the first rod 221 are unscrewed and removed. The first rod 221 can slide back and forth in the threaded hole in the middle of the sealing plate 223. The back and forth sliding of the first rod 221 drives the back and forth sliding of the second rod 222, but the rotation of the first rod 221 does not affect the rotation of the second rod 222. A stop bar 27 is fixedly connected to the middle of the connecting rod 24; an installation ring 28 is fixedly connected to the near surface of the baffle 25 through an installation rod that is correspondingly set on the connecting rod 24, and the far surface of the installation ring 28 can contact the near surface of the stop bar 27; in use, the first rod body 221 slides back and forth, driving the second rod body 222 to slide back and forth; thereby realizing that the connecting rod 24 slides back and forth, driving the cone 21 to move closer to the center or open the stop bar 27 and the installation ring 28. The setting auxiliary baffle 25 and the connecting rod 24 are relatively displaced. When the stop bar 27 and the installation ring 28 are in close contact, the baffle 25 and the connecting rod 24 no longer have relative displacement, but instead pull the guide tube 2. The outer sleeve 1 has a scale 15 on its side wall; The gripper 22 is slidably sealed with a threaded cap 29 on its proximal side, and the threaded cap 29 is threadedly installed to seal the outer side of the proximal end of the outer sleeve 1.

[0016] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An anal dilator for obtaining specimens from natural cavities, comprising an outer cannula (1) and a guide tube (2) fitted inside the outer cannula (1), wherein the inner end of the guide tube (2) is provided with a cone (21) and the proximal end is provided with a gripper (22), characterized in that, The gripper (22) extends from the proximal end of the outer sleeve (1); the other end of the gripper (22) is fixedly connected to a mounting plate (23), and the other end of the mounting plate (23) is fixedly connected to a cone (21) through at least two connecting rods (24); a baffle (25) is slidably connected to the side of the connecting rod (24) near the cone (21), and a hinge seat (26) is fixedly provided on the far side of the baffle (25) corresponding to the cone (21), and the hinge seat (26) is hinged to the cone (21); the cone (21) extends from the inner end of the outer sleeve (1).

2. The anal dilator cannula for obtaining specimens from natural orifices according to claim 1, characterized in that, The outer sheath (1) is integrally formed from the proximal external segment (11), the middle anal canal adhering segment (12), and the short intestinal segment (13) from the outside to the inside; the hollow cavity connected by the proximal external segment (11), the middle anal canal adhering segment (12), and the short intestinal segment (13) forms a through main channel (14) for specimen removal.

3. The anal dilator cannula for obtaining specimens from natural orifices according to claim 1, characterized in that, The gripper (22) includes a first rod (221) and a second rod (222). The first rod (221) extends from the near end of the outer sleeve (1). The first rod (221) and the second rod (222) are rotatably connected by a bearing. The far end of the second rod (222) is fixedly connected to an mounting plate (23). A sealing plate (223) is threadedly connected to the side of the first rod (221). The sealing plate (223) is in close contact with the inner wall of the outer sleeve (1).

4. The anal dilator cannula for obtaining specimens from natural orifices according to claim 3, characterized in that, A stop bar (27) is fixedly connected to the middle of the connecting rod (24); an installation ring (28) is fixedly connected to the near side of the baffle (25) through the installation rods that are set one-to-one with the connecting rods (24), and the far side of the installation ring (28) can contact the near side of the stop bar (27).

5. The anal dilator cannula for obtaining specimens from natural orifices according to claim 1, characterized in that, The outer sleeve (1) has a scale (15) on its side wall.

6. The anal dilator cannula for obtaining specimens from natural orifices according to claim 1, characterized in that, The gripper (22) is slidably sealed with a threaded cap (29) on its proximal side, and the threaded cap (29) and the outer side of the outer sleeve (1) are sealed with a threaded installation.

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