Novel guiding sheath

Abstract

The utility model discloses a novel guiding sheath, and belongs to the technical field of medical instruments. A novel guide sheath comprises a sheath tube and a dilator, a bending assembly is arranged at one end of the sheath tube, a negative pressure connector is arranged at the other end of the bending assembly, and the dilator is inserted from one end of the negative pressure connector and extends out of the sheath tube. A metal stay wire is arranged in the sheath tube, the sheath tube comprises a sheath tube soft section and a sheath tube hard section, the metal stay wire penetrates through the sheath tube soft section and is fixed to a metal ring fixed to the head end of the sheath tube soft section, and the other end of the metal stay wire penetrates through a side hole in the sheath tube hard section and extends to the outer side of the sheath tube hard section to be bent and fixed to form a metal stay wire ring. The metal stay wire is arranged in the sheath tube, the end portion of the metal stay wire extends out of the sheath tube, the metal stay wire is pulled to move back and forth, so that the sheath tube is bent, the hard section of the sheath tube is close to the rear and high in hardness, deformation of the hard section of the sheath tube is small, the soft section of the sheath tube is close to the front and low in hardness, and large bending deformation occurs. The problem that the sheathing canal is bent depending on an endoscope is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and more specifically, to a novel guiding sheath. Background Art

[0002] The combined application of negative pressure technology and endoscope technology in medicine has gradually become the mainstream. A large number of clinical literatures have illustrated the superiority of their combined application, especially in promoting the reduction of operation time and the alleviation of operation difficulty. In the treatment of urinary system stones or other system stones, under the vision of the endoscope, a lithotripsy operation is carried out. The stones broken by various energies are sucked out of the body through the guiding sheath with the negative pressure suction, thus completing the treatment of the disease. However, most of the guiding sheaths on the market at present are passively bent (bent by the drive of a flexible endoscope). When dealing with stones, this passively bent guiding sheath needs to be bent at a large angle, so it depends on the bending force of the endoscope. Since the bending forces of endoscopes of different manufacturers are different, sometimes when dealing with stones, there will be a problem of poor bending effect. The guiding sheath that can bend itself without the aid of an endoscope can effectively solve this problem. Based on this, we propose a novel guiding sheath. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a novel guiding sheath to solve the problems put forward in the above background art.

[0004] To achieve the above purpose, the utility model provides the following technical solutions:

[0005] A novel guiding sheath includes a sheath tube and a dilator. One end of the sheath tube is provided with a bending component, and the other end of the bending component is provided with a negative pressure connector. The dilator is inserted from one end of the negative pressure connector and extends out of the sheath tube;

[0006] A metal wire is arranged inside the sheath tube. The sheath tube includes a soft section and a hard section of the sheath tube. The hard section of the sheath tube is close to the bending component. One end of the metal wire passes through the soft section of the sheath tube and is fixedly connected with a metal ring fixed to the head end of the soft section of the sheath tube. The other end of the metal wire passes through a side hole on the hard section of the sheath tube and extends to the outside of the hard section of the sheath tube and is bent and fixed to form a metal wire loop.

[0007] Preferably, the sheath tube is a composite tube composed of multiple layers of materials. A spring support is arranged inside the soft section of the sheath tube, and a metal ring is arranged at the head end of the soft section of the sheath tube. The metal wire is fixedly connected with the metal ring;

[0008] A spring support or a braided mesh support is arranged inside the hard section of the sheath tube.

[0009] Preferably, the innermost layer of the sheath tube is a tube made of a polymer material. A channel is arranged along the length direction of the sheath tube between the tube made of the polymer material and the spring or braided mesh inside the sheath tube. The metal wire passes through the channel.

[0010] Preferably, the bending assembly further includes a housing, an installation block is arranged inside the housing, a sliding block groove is formed in the installation block, a wire-pulling slider is slidably installed in the sliding block groove, and the metal wire-pulling ring is connected to the wire-pulling slider.

[0011] Preferably, an installation groove is formed in the housing, and the installation block is arranged in the installation groove;

[0012] A plurality of rounded tooth openings arranged linearly are formed in the sliding block groove, an elastic sheet is arranged on the wire-pulling slider, two acute-angle bends are oppositely arranged at both ends of the elastic sheet, and the acute-angle bends are matched with the rounded tooth openings.

[0013] Preferably, a push-pull block is arranged at the upper end of the wire-pulling slider, the upper end of the push-pull block extends above the installation groove, and a gear position indicating block is further arranged on the push-pull block;

[0014] A gear position mark is arranged on the housing, and a protective cap is further connected to one end of the housing close to the sheath tube.

[0015] Preferably, the negative pressure connector includes a Y-shaped connector, the Y-shaped connector is rotatably connected to the housing, a silica gel ring is sleeved on one end of the Y-shaped connector, and a silica gel cap is arranged on the other end of the Y-shaped connector;

[0016] A negative pressure interface cavity is arranged inside the housing, and one end of the silica gel ring of the Y-shaped connector is press-fitted into the negative pressure interface cavity.

[0017] Preferably, an opening groove is formed in one end of the Y-shaped connector, a sealing piece is sleeved on the Y-shaped connector at the position of the opening groove, and the sealing piece can slide along the extending direction of the opening groove.

[0018] Preferably, the dilator includes a dilation seat and a dilation tube which are connected to each other, the dilation tube sequentially passes through the negative pressure connector and the sheath tube and extends to the outside, and the dilation seat is clamped with the negative pressure connector.

[0019] Preferably, the front end part of the dilation tube gradually decreases in size to form a tip.

[0020] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0021] (1) By arranging a metal wire inside the sheath tube in the utility model, and the end part of the metal wire extends out of the sheath tube, the sheath tube is bent by pulling the metal wire to move back and forth. Since the hard section of the sheath tube is at the back and has a greater hardness, the deformation of the hard section of the sheath tube is tiny. The soft section of the sheath tube is at the front and has a smaller hardness, and a larger bending deformation occurs, achieving the bending effect. It solves the problem that the sheath tube depends on the endoscope for bending, and at the same time can improve the surgical efficiency and reduce the surgical time.

[0022] (2) In the present utility model, the end of the sheath tube is installed inside the housing, and the housing and the Y-shaped joint can achieve 360° circumferential rotation. Therefore, if bending treatment in other directions is required during the operation, the Y-shaped joint can be held, and then the housing and the sheath tube can be rotated to achieve the actual bending function in all directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of the guiding sheath;

[0024] Figure 2 It is a schematic structural diagram of the sheath tube;

[0025] Figure 3 It is a schematic structural diagram of the bending assembly;

[0026] Figure 4 It is a schematic cross-sectional view of the bending assembly;

[0027] Figure 5 It is a schematic structural diagram of the housing

[0028] Figure 6 It is a schematic diagram of the internal parts of the bending assembly;

[0029] Figure 7 It is a schematic structural diagram of the push-pull block;

[0030] Figure 8 It is a schematic diagram of the fixation of the sheath tube and the bending assembly;

[0031] Figure 9 It is a schematic structural diagram of the negative pressure joint;

[0032] Figure 10 It is a schematic structural diagram of the dilator.

[0033] Explanation of the reference numerals in the figures: 1. Sheath tube; 2. Bending assembly; 3. Negative pressure joint; 4. Dilator; 11. Metal wire loop; 12. Soft section of the sheath tube; 13. Hard section of the sheath tube; 14. Metal ring; 21. Protective cap; 22. Push-pull block; 23. Housing; 24. Wire-pulling slider; 25. Slider groove; 26. Elastic piece; 31. Silicone cap; 32. Sealing piece; 33. Silicone ring; 34. Y-shaped joint; 41. Dilatation seat; 42. Dilatation tube; 100. Fixing position of the wire loop; 221. Gear indicating block; 231. Gear mark; 232. Negative pressure interface cavity; 233. Sheath tube fixing position; 234. Installation groove; 241. Pin; 251. Rounded tooth mouth; 261. Acute-angle bend. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0035] Embodiment:

[0036] Please refer to Figures 1-10 , a new type of guiding sheath, which includes a sheath tube 1 and a dilator 4. One end of the sheath tube 1 is provided with a bending assembly 2, the other end of the bending assembly 2 is provided with a negative pressure joint 3, and the dilator 4 is inserted from one end of the negative pressure joint 3 and extends out of the sheath tube 1.

[0037] As Figure 2 shown, a metal wire passes through the internal channel of the sheath tube 1. The sheath tube 1 includes a soft section 12 and a hard section 13 of the sheath tube. The hard section 13 of the sheath tube is close to the bending assembly 2. One end of the metal wire passes through the soft section 12 of the sheath tube and is fixedly connected to a metal ring 14 fixed at the head end of the soft section of the sheath tube. The other end of the metal wire passes through the side hole on the hard section 13 of the sheath tube and extends to the outside of the hard section 13 of the sheath tube and is fixed after being bent to form a metal wire loop 11. By pulling the metal wire loop 11 outward, the head end of the sheath tube 1 is bent by using the metal wire, thus solving the problem that the sheath tube depends on the bending of the endoscope. Among them, the bending assembly 2 is rotatably connected to the negative pressure joint 3. When in use, hold the negative pressure joint 3, and the sheath tube 1 can be driven to rotate by rotating the bending assembly 2, realizing the actual bending function in all directions.

[0038] In this application, the sheath tube 1 is a composite tube composed of multiple layers of materials. The composite tube is composed of a soft section 12 and a hard section 13 of the sheath tube. A spring support is arranged inside the soft section 12 of the sheath tube. A metal ring 14 is arranged at the head end of the soft section 12 of the sheath tube, and the metal wire is fixedly connected to the metal ring 14; a spring support or a braided mesh support is arranged inside the hard section 13 of the sheath tube. Among them, the spring is arranged around the soft section 12 of the sheath tube, and the spring or the braided mesh is also arranged around the hard section 13 of the sheath tube. A side hole is opened on the side surface of the hard section 13 of the sheath tube away from the metal ring 14, and the other end of the metal wire passes through the side hole and extends to the outside of the sheath tube 1. A bending direction indication mark is printed on the surface of the hard section 13 of the sheath tube to indicate the bending direction of the sheath tube.

[0039] Specifically, the innermost layer of the sheath tube 1 is a tube made of a polymer material. There is a channel along the length direction of the sheath tube 1 between the tube made of the polymer material and the spring or the braided mesh inside the sheath tube 1, and the metal wire passes through the channel.

[0040] As Figures 3-8As shown, in the present application, the bending assembly 2 further includes a housing 23. An installation block is arranged inside the housing 23. A slide block groove 25 is formed on the installation block. A wire-pulling slide block 24 is slidably installed in the slide block groove 25. The metal wire-pulling ring 11 is connected to the wire-pulling slide block 24. An installation groove 234 is formed on the housing 23. The installation block is arranged and fixed in the installation groove 234. The wire-pulling slide block 24 is in sliding fit with the slide block groove 25. One end of the wire-pulling slide block 24 is inserted with a pin 241. The metal wire-pulling ring 11 is sleeved on the pin 241 to form a wire-pulling ring fixing position 100, realizing the connection and fixation between the pin 241 and the wire-pulling slide block 24. By moving the wire-pulling slide block 24 along the slide block groove 25, the metal wire is driven to be pulled backward.

[0041] As Figure 4 shown, a sheath tube fixing position 233 is further arranged on the housing 23. One end of the sheath tube 1 extends into the sheath tube fixing position 233 for fixation, so that the sheath tube 1 is connected and fixed to the housing 23.

[0042] As Figure 6 shown, a plurality of rounded tooth openings 251 arranged linearly are arranged in the slide block groove 25. The plurality of rounded tooth openings 251 form a wavy structure. An elastic sheet 26 is arranged on the wire-pulling slide block 24. The middle part of the elastic sheet 26 is installed in a groove on the wire-pulling slide block 24. Both sides of the elastic sheet 26 are inclined to both sides respectively. Two acute-angle bends 261 are oppositely arranged at both ends of the elastic sheet 26. The acute-angle bends 261 cooperate with the rounded tooth openings 251. When the wire-pulling slide block 24 slides in the installation groove 234 under an external force, the elastic sheet 26 will move along with the wire-pulling slide block 24, and the acute-angle bends 261 at the ends of the elastic sheet 26 will move back and forth along the linearly arranged rounded tooth openings 251. During the movement, the elastic sheet 26 will be squeezed and deformed along with the radian of the rounded tooth openings 251. When the movement of the wire-pulling slide block 24 stops, the acute-angle bends 261 will stop in one of the rounded tooth openings 251, thereby fixing the position of the wire-pulling slide block 24. By moving the wire-pulling slide block 24 back and forth, the metal wire-pulling ring 11 is driven to move back and forth, thereby driving the flexible section 12 of the sheath tube to bend.

[0043] In the present application, a push-pull block 22 is arranged at the upper end of the wire-pulling slide block 24. The push-pull block 22 is installed on the wire-pulling slide block 24. A convex block at the lower end of the push-pull block 22 extends between both ends of the elastic sheet 26, facilitating the pushing of the elastic sheet 26 to move. The upper end of the push-pull block 22 extends above the installation groove 234. A gear position indicating block 221 is further arranged on the push-pull block 22. A gear position mark 231 is arranged on the housing 23. By pushing and pulling the push-pull block 22 back and forth, the wire-pulling slide block 24 and the elastic sheet 26 are driven to move back and forth. The gear position indicating block 221 on the push-pull block 22 will point to the gear position mark 231, representing the bending level.

[0044] As Figure 3As shown, a protective cap 21 is also connected to one end of the outer shell 23 close to the sheath tube 1. When the protective cap 21 is installed, the protective cap 21 is sleeved into the soft section 12 of the sheath tube and moved to the end of the outer shell 23, so that the protective cap 21 is fixed to the end of the outer shell 23.

[0045] As Figure 9 shown, the negative pressure connector 3 includes a Y-shaped connector 34. The Y-shaped connector 34 is rotatably connected to the outer shell 23. A silica gel ring 33 is sleeved on one end of the Y-shaped connector 34, and a silica gel cap 31 is arranged at the other end of the Y-shaped connector 34. A negative pressure interface cavity 232 is arranged in the outer shell 23, and one end of the silica gel ring 33 of the Y-shaped connector 34 is press-fitted into the negative pressure interface cavity 232. The silica gel ring 33 is made of a soft material and has a sealing function to prevent gas or liquid leakage. At the same time, the outer shell 23 can rotate circumferentially by 360° relative to the Y-shaped head 34, so that the sheath tube 1 can be rotated by rotating the outer shell 23, and the sheath tube 1 can realize the actual bending function in all directions.

[0046] In this application, an opening groove is formed at one end of the Y-shaped connector 34. A sealing piece 32 is sleeved on the Y-shaped connector 34 at the opening groove. The sealing piece 32 can slide along the extension direction of the opening groove. The opening groove and the sealing piece 32 are both located on the inclined branch of the Y-shaped head 34. The opening groove extends along the length direction of the inclined branch. The intensity of the negative pressure attraction is adjusted by covering the area of the opening groove with the sealing piece 32. The external negative pressure source is connected to the inclined branch of the Y-shaped head 34.

[0047] As Figure 10 shown, the dilator 4 includes a dilator base 41 and a dilator tube 42 which are connected to each other. The dilator tube 42 sequentially passes through the negative pressure connector 3, the bending assembly 2, and the sheath tube 1 and extends to the outside. The dilator base 41 is clamped with the negative pressure connector 3. A hole is formed in the silica gel cap 31. The dilator tube 42 is inserted through the hole until it extends out of the sheath tube 1. The dilator base 41 will be stuck on the Y-shaped head 34. The front end part of the dilator tube 42 gradually becomes smaller in size to form a tip, which is easier to be introduced into a relatively narrow part of the patient.

[0048] During use, by pushing and pulling the quick push-pull piece 22 back and forth, the elastic piece 26 is squeezed and deformed in the front-back direction, driving the elastic piece 26 to move back and forth along the rounded tooth opening 251, thereby driving the wire slider 24 to move back and forth, and further driving the metal wire loop 11 to move back and forth. Since the metal wire is fixed to the metal ring 14, the metal wire loop 11 drives the metal wire to move back and forth, causing the sheath tube 1 to be bent. The hard section 13 of the sheath tube is located at the rear and has a relatively high hardness, so the deformation of the hard section 13 of the sheath tube is small. The soft section 12 of the sheath tube is located at the front and has a relatively low hardness, undergoing a large bending deformation to achieve the bending effect. Among them, the housing 23 has a gear mark 231, and the gear indicating block 221 on the quick push-pull piece 22 will point to the gear mark 231, representing the bending level; at the same time, the bending direction indicating mark is printed on the surface of the sheath tube 1, which will remind the operator of the bending orientation during bending to prevent bending in an unwanted direction.

[0049] The negative pressure connector 3 is press-fitted into the negative pressure interface cavity 232 through the silicone ring 33 and the Y-shaped head 34. The housing 23 can rotate 360° circumferentially relative to the Y-shaped head 34. Therefore, if other-direction bending treatment is required during the operation, the Y-shaped head 34 can be held, and then the housing 23 is rotated. By driving the sheath tube 1 to rotate through the housing 23, the actual bending function in all directions can be achieved. The intensity of the negative pressure attraction is adjusted by sliding the sealing piece 32 to cover the area of the opening groove on the Y-shaped head 34. The external negative pressure source is connected to the oblique branch of the Y-shaped head 34.

[0050] During the actual operation, the guiding sheath is pre-placed in the corresponding part of the human body along the guiding guide wire, and then the dilator 4 is taken out. The endoscope is inserted through the small hole on the silicone cap 31 until it slightly protrudes from the sheath tube 1, or the dilator 4 is taken out first, and then an endoscope of an appropriate size is selected. The endoscope enters the sheath tube 1 through the small hole on the silicone cap 31 until it slightly protrudes from the sheath tube 1. At this time, under the endoscope view, the endoscope and the guiding sheath are placed in the corresponding part of the human body together; after the guiding sheath is placed in place, the quick push-pull piece 22 can be pushed back and forth at this time to drive the sheath tube 1 to bend, so as to find the location of the stone under the endoscope view. After the stone is treated, the stone fragments are sucked out of the human body through the inner cavity of the sheath tube under the attraction of the external negative pressure source. During the process, the sealing piece 32 can be slid to adjust the intensity of the negative pressure attraction to better control the discharge of the stone fragments from the human body. If stones in other directions need to be treated, the housing 23 can be rotated. After the operation is completed, the guiding sheath is taken out and disposed of as medical waste.

[0051] The basic principle, main features and advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A novel guiding sheath, comprising a sheath tube (1) and a dilator (4), characterized in that: One end of the sheath tube (1) is provided with a bending assembly (2), the other end of the bending assembly (2) is provided with a negative pressure connector (3), and the dilator (4) is inserted from one end of the negative pressure connector (3) and extends out of the sheath tube (1); A metal wire is arranged inside the sheath tube (1). The sheath tube (1) comprises a soft section (12) and a hard section (13) of the sheath tube. The hard section (13) of the sheath tube is arranged on one side close to the bending assembly (2). One end of the metal wire passes through the soft section (12) of the sheath tube, and the other end of the metal wire passes through a side hole on the hard section (13) of the sheath tube and extends to the outside of the hard section (13) of the sheath tube and is bent and fixed to form a metal wire loop (11).

2. A novel guiding sheath according to claim 1, characterized in that: The sheath tube (1) is a composite tube composed of multiple layers of materials. A spring support is arranged inside the soft section (12) of the sheath tube. A metal ring (14) is arranged at the head end of the soft section (12) of the sheath tube, and the metal wire is fixedly connected with the metal ring (14); A spring support or a braided mesh support is arranged inside the hard section (13) of the sheath tube.

3. The novel guiding sheath according to claim 2, characterized in that: The innermost layer of the sheath tube (1) is a tube made of a polymer material. A channel is arranged between the tube made of the polymer material and the spring or the braided mesh inside the sheath tube (1) along the length direction of the sheath tube (1), and the metal wire passes through the channel.

4. A novel guiding sheath according to claim 1, characterized in that: The bending assembly (2) further comprises a housing (23). An installation block is arranged inside the housing (23). A sliding block groove (25) is formed in the installation block. A wire sliding block (24) is slidably installed in the sliding block groove (25), and the metal wire loop (11) is connected with the wire sliding block (24).

5. A novel guiding sheath according to claim 4, characterized in that: An installation groove (234) is formed in the housing (23), and the installation block is arranged in the installation groove (234); A plurality of rounded tooth openings (251) arranged linearly are arranged inside the sliding block groove (25). An elastic sheet (26) is arranged on the wire sliding block (24). Two acute-angle bends (261) are oppositely arranged at both ends of the elastic sheet (26), and the acute-angle bends (261) are matched with the rounded tooth openings (251).

6. A novel guiding sheath according to claim 4, characterized in that: A push-pull block (22) is arranged at the upper end of the wire sliding block (24). The upper end of the push-pull block (22) extends above the installation groove (234), and a gear indicating block (221) is further arranged on the push-pull block (22); A gear mark (231) is arranged on the housing (23), and a protective cap (21) is further connected to one end of the housing (23) close to the sheath tube (1).

7. A novel guiding sheath according to claim 4, characterized in that: The negative pressure connector (3) comprises a Y-shaped connector (34). The Y-shaped connector (34) is rotatably connected with the housing (23). A silica gel ring (33) is sleeved on one end of the Y-shaped connector (34), and a silica gel cap (31) is arranged at the other end of the Y-shaped connector (34); A negative pressure interface cavity (232) is arranged inside the housing (23), and one end of the silica gel ring (33) of the Y-shaped connector (34) is press-fitted into the negative pressure interface cavity (232).

8. A novel guiding sheath according to claim 7, wherein: An opening groove is formed at one end of the Y-shaped connector (34). A sealing piece (32) is sleeved on the Y-shaped connector (34) at the opening groove, and the sealing piece (32) can slide along the extending direction of the opening groove.

9. A novel guiding sheath according to claim 1, characterized in that: The dilator (4) includes a dilation base (41) and a dilation tube (42) that are connected to each other. The dilation tube (42) sequentially passes through the negative pressure connector (3) and the sheath tube (1) and extends to the outside. The dilation base (41) is snap-fitted with the negative pressure connector (3).

10. A novel guiding sheath according to claim 9, characterized in that: The front end portion of the dilation tube (42) gradually decreases in size to form a tip.

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