Mesh basket assembly and stone breaking and clearing protection device

Abstract

The invention provides a mesh basket assembly. The mesh basket assembly comprises a sheathing canal and a protective cover. The sheathing canal is used for introducing a surgical instrument; the protective cover comprises an annular tube body connected to the tail end of the sheath tube, a plurality of supporting strips extending from the end, away from the sheath tube, of the tube body, and a covering film. The supporting strips are made of elastic materials, the multiple supporting strips are distributed at intervals along the tail end of the pipe body and jointly define an annular structure, the covering film is an annular film made of elastic materials, and the covering film is arranged on the annular structure defined by the supporting strips and fixedly attached to the supporting strips. When the annular structure defined by the supporting strips bears thrust in the outward direction from the inner side of the annular structure, the supporting strips expand outwards to be in a horn shape, and when the thrust disappears, the supporting strips bear elastic restoring force of the covering film and restore to the initial state. The invention further provides a stone breaking and clearing protection device. Compared with the prior art, the mesh basket assembly and the stone breaking and clearing protection device are better in stone breaking and clearing safety.

Description

Technical Field

[0001] The present invention relates to the technical field of instruments for lithotripsy, stone clearance and protection of human tissues and organs, and particularly to a basket assembly for use within a sheath tube and a device for lithotripsy, stone clearance and protection. Background Art

[0002] Calculi in the human body are commonly found in parts such as the gallbladder and urinary system. The common means of clinical lithotripsy are thermal laser lithotripsy and electrohydraulic lithotripsy. Commonly used endoscopic in-vivo lithotripsy devices are through the internal channels of endoscopes such as fiberoptic choledochoscopes, rigid choledochoscopes, duodenoscopes, gastroscopes, cystoscopes, ureteroscopes, and percutaneous nephroscopes. The electrodes for electrohydraulic lithotripsy and the optical fibers for laser lithotripsy are respectively directionally conducted through the internal channels of the endoscope.

[0003] Thermal laser lithotripsy is the most common lithotripsy means for urinary calculi. Its energy conversion result is heat energy, and the core temperature exceeds 4700 °C. However, the consequence is that the water that must be injected while burning and crushing the calculi is heated, resulting in the consequence of "boiling the ureter". Part of the laser pulse energy instantaneously vaporizes the injected water and directly burns the ureter or kidney tissue, leading to ureteral stricture / atresia and loss of renal function. The tissue and organ damage in thermal laser lithotripsy surgery is the direct cause of ureteral stricture or loss of renal function. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a basket assembly and a device for lithotripsy, stone clearance and protection with better safety for lithotripsy and stone clearance.

[0005] To solve the above technical problem, an embodiment of the present invention provides a basket assembly, which is applied to a device for protecting tissues or organs during lithotripsy and stone clearance, so that the hot steam or hot water generated by lithotripsy energy such as laser is isolated from the tissues or organs, achieving the purpose of not damaging the normal human tissues or organs at the surgical site. The basket assembly includes a sheath tube and a shield;

[0006] The sheath tube is used for introducing surgical instruments;

[0007] The shield includes an annular tube body connected to the end of the sheath tube, a plurality of support bars extending from one end of the tube body away from the sheath tube, and a film; the support bars are made of an elastic material, and the plurality of support bars are spaced apart along the end of the tube body and jointly enclose an annular structure. The film is an annular film made of an elastic material, and the film surrounds the annular structure formed by the support bars and is fixedly attached to the support bars; when the annular structure formed by the support bars receives a thrust force in the direction from the inside to the outside, the support bars expand outward into a trumpet shape, and when the thrust force disappears, the support bars return to the initial state under the elastic restoring force of the film.

[0008] Preferably, the shield is formed by extending the sheath tube, and the shield, the tube body and the support bar are an integrally formed structure.

[0009] Preferably, the outer diameter of the end of the annular structure formed by all the support bars in the initial state is smaller than the outer diameter of the sheath tube.

[0010] Preferably, the basket assembly also includes a catheter and a guide bar; the catheter is received in the sheath tube and forms a sliding connection with the sheath tube, and the guide bar is received in the catheter and forms a sliding connection with the catheter; the guide bar includes a guide bar body and a plurality of metal wires extending from the end of the guide bar body, the metal wires are made of shape memory material, a plurality of the metal wires are distributed at intervals along the circumferential side of the end of the guide bar body, and all the ends of the metal wires away from the guide bar body are connected to each other; when the metal wires are received in the catheter, the plurality of the metal wires respectively abut against the inner side of the catheter and extend in an axial spiral along the catheter; when the metal wires slide to the outside of the catheter and are located outside the sheath tube, all the metal wires return to their respective memory shapes and together form a cage-shaped basket with a receiving space; the length of the basket along the axial direction of the sheath tube is greater than the length of the support bar along the axial direction of the sheath tube, and the basket abuts against the inner side of the support bar to expand the support bar to form a trumpet shape.

[0011] Preferably, the length of the coating along the axial direction of the tube body is equal to the length of the support bar along the axial direction of the tube body.

[0012] Preferably, the coating is attached to the outer circumference or the inner circumference of the annular structure formed by the support bars or between every two adjacent support bars.

[0013] Preferably, the metal wire is made of nickel-titanium memory alloy or stainless steel memory alloy.

[0014] Preferably, the guide bar further comprises a hydrophilic soft head, and the hydrophilic soft head is formed by extending one end of the metal wires connected to each other along the axial direction of the guide bar.

[0015] Preferably, the basket assembly also includes a movable inner tube, which is accommodated in the sheath tube and forms a sliding connection with the sheath tube, and the catheter is accommodated in the movable inner tube and forms a sliding connection with the movable inner tube; the gap between the sheath tube and the movable inner tube forms a water injection channel, and an integral inner cavity is provided in the movable inner tube, which is used to accommodate surgical instruments, and the part of the inner cavity located between the tube wall of the movable inner tube and the surgical instruments is used to form a drainage channel.

[0016] An embodiment of the present invention further provides a stone crushing and stone clearing protection device, comprising the above-mentioned basket assembly provided by the present invention.

[0017] Compared with the prior art, in the basket assembly and the stone lithotripsy and stone cleaning protection device of the present invention, the shield includes an annular tube body connected to the end of the sheath tube, a plurality of support bars extending from one end of the tube body away from the sheath tube, and a film; the support bars are made of an elastic material, and the plurality of support bars are spaced apart along the end of the tube body and jointly enclose an annular structure. The film is an annular film made of an elastic material. The film surrounds the annular structure formed by the support bars and is fixedly attached to the support bars; when the annular structure formed by the support bars receives a thrust force in the direction from the inside to the outside (such as a cage-shaped basket), the support bars expand outward into a trumpet shape. When the thrust force disappears, the support bars return to the initial state under the elastic restoring force of the film. Through the design of the above structure, when the sheath tube reaches the stone position during use, other instruments in the sheath tube are operated to extend out of the sheath tube to push against the support bars to expand outward into a trumpet shape. The film stretches and generates elastic deformation as the support bars expand. At this time, the trumpet-shaped structure formed by the support bars and the film jointly form a protective cover structure to isolate the hot steam or high-temperature water space generated by the thermal laser. At the same time, the high-temperature water is removed in real time through the water return lumen (drainage water path) under negative pressure, so that the vaporized water, laser high temperature, and crushed stones during the high-temperature stone cleaning process are isolated in a limited space and removed synchronously. During the stable water circulation process of pumping away the high-temperature tissue fluid and high-temperature steam, it is possible to avoid the human tissue from being damaged by the overflowing high temperature or the impact of the crushed stones on the surrounding area, and the safety is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be described in detail below with reference to the drawings. Through the detailed description in combination with the following drawings, the above or other aspects of the present invention will become clearer and easier to understand. In the drawings:

[0019] Figure 1 is a partial structural schematic diagram of the basket assembly of the present invention, and the basket is in an open state;

[0020] Figure 2 is another partial structural schematic diagram of the basket assembly of the present invention, and the basket is in a contracted state;

[0021] Figure 3 is a structural schematic diagram of the basket assembly of the present invention when applied to the sheath tube. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The specific embodiments of the present invention will be described in detail below with reference to the drawings.

[0023] The specific embodiments / Examples described herein are specific embodiments of the present invention, used to illustrate the concept of the present invention, and are all explanatory and exemplary, and should not be construed as limiting the embodiments of the present invention and the scope of the present invention. Except for the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the content disclosed in the claims and the specification of this application. These technical solutions include technical solutions that make any obvious substitutions and modifications to the embodiments described herein, and are all within the protection scope of the present invention.

[0024] The following description of each embodiment refers to the accompanying drawings, which are used to illustrate specific embodiments in which the present invention can be implemented. The directional terms mentioned in the present invention, such as up, down, front, back, left, right, inside, outside, side, etc., are only with reference to the directions in the accompanying drawings. Therefore, the directional terms used are for explaining and understanding the present invention, rather than for limiting the present invention.

[0025] Please refer Figures 1 - 3 As shown, the present invention provides a basket assembly 100, which is applied to a stone lithotripsy and stone removal protection device. The basket assembly 100 includes: a sheath 1 and a shield 2.

[0026] The sheath 1 is used to introduce surgical instruments.

[0027] The shield 2 includes an annular tube body 21 connected to the end of the sheath 1, a plurality of support bars 22 extending from one end of the tube body 21 away from the sheath 1, and a film 23.

[0028] The support bars 22 are made of an elastic material, and the plurality of support bars 22 are spaced apart along the end of the tube body 21 and jointly form an annular structure.

[0029] The film 23 is an annular film made of an elastic material. Of course, it can also be formed by a plurality of sheet films jointly enclosing an annular shape. The film 23 is sleeved on the annular structure formed by the support bars 22 and is fixedly attached to the support bars 22.

[0030] When the annular structure formed by the support bars 22 is subjected to a thrust force from the inner side to the outer side, the support bars 22 expand outward into a trumpet shape. At this time, the film 23 undergoes a tensile elastic deformation as the support bars 22 expand. When the thrust force disappears, the support bars 22 return to the initial state under the elastic restoring force of the film 23.

[0031] The film coating 23 is made of an elastic material, and of course, it also needs to meet the performance requirements of corrosion resistance and high temperature resistance. When the support bar 22 is in the initial state of inertia, the film coating 23 is in a natural state. When the support bar 22 expands to form a cage shape, the film coating 23 is in a tensile deformation state. In the above structure, the horn shape formed by the support bar 22 during use in combination with the fitting of the film coating 23 together makes the protective cover 2 form a protective cover structure, isolating the surgical space at the front end of the sheath tube 1, so that the vaporized water, laser high temperature, and crushed stones during the high-temperature stone removal process are isolated in a limited space. During the stable water circulation process of pumping away the high-temperature tissue fluid and high-temperature steam, it avoids the human tissue from being damaged by the overflowing high temperature or the impact of the crushed stones on the surrounding area, with higher safety.

[0032] In this embodiment, the length of the film coating 23 along the axial direction of the tube body 21 is equal to the length of the support bar 22 along the axial direction of the tube body 21, so as to make the isolation and protection range of the protective cover 2 as large as possible. Of course, the length of the film coating 23 along the axial direction of the tube body 21 can also be less than the length of the support bar 22 along the axial direction of the tube body 21. More preferably, the film coating 23 is attached and fixed to the outer peripheral side or the inner peripheral side of the annular structure surrounded by the support bar 22 or between every two adjacent support bars 22, which can also improve the isolation and protection range, and can make the support bar 22 play a role in guiding the circulating water path.

[0033] The protective cover 2 can be a separate structure connected and fixed to the end of the sheath tube 1, or can be an integral structure with the sheath tube 1. In this embodiment, the protective cover 2 is formed by extending from the sheath tube 1, and the protective cover 2, the tube body 21, and the support bar 22 are an integrally formed structure.

[0034] More preferably, since the plurality of support bars 22 are spaced apart, all the support bars 22 are in a contracted initial state in the initial state of inertia, and the outer diameter of the tube at the end of the annular structure surrounded by them is smaller than the outer diameter of the sheath tube 1, which is more convenient to insert into the human body.

[0035] In this embodiment, the basket assembly 100 further includes a catheter 3 and a guide bar 4.

[0036] The catheter 3 is received in the sheath tube 1 and forms a sliding connection with the sheath tube 1. The guide bar 4 is received in the catheter 3 and forms a sliding connection with the catheter 3, so as to form an indirect sliding connection with the sheath tube 1.

[0037] The guide bar 4 includes a guide bar body 41 and a plurality of metal wires 42 extending from the end of the guide bar body 41. The metal wires 42 are made of a shape memory material, such as shape memory metal wires. In this embodiment, specifically, the metal wires 42 are made of nickel-titanium memory alloy or stainless steel memory alloy, but are not limited thereto.

[0038] The plurality of metal wires 42 are distributed at intervals along the circumference of the end of the guide bar body 41 , and the ends of all the metal wires 42 away from the guide bar body 41 are connected to each other, so that the plurality of metal wires 42 together form a cage-like structure.

[0039] When the metal wires 42 are received in the catheter 3, the plurality of metal wires 42 respectively abut against the inner side of the catheter 3 and extend spirally along the axial direction of the catheter 3. Since there are gaps between the metal wires 42, all the metal wires 42 are close to each other in a static (inertial) state, and the diameter of the tube formed by them is smaller than the diameter of the catheter 3, so that the catheter 3 is easily retracted.

[0040] When the metal wires 42 slide to the outside of the catheter 3 and are located outside the sheath tube 1, all the metal wires 42 return to their respective memory shapes and together form a cage-shaped basket 422 with a receiving space. The basket 422 can effectively contain the stones in its receiving space to form a limit. The length of the basket 422 along the axial direction of the sheath tube 1 is greater than the length of the support bar 22 along the axial direction of the sheath tube 1, and the basket 422 abuts against the inner side of the support bar 22 to expand the support bar 22 to form a trumpet shape.

[0041] The guide bar 4 further includes a hydrophilic soft head 43 , which is formed by extending one end of the metal wires 42 connected to each other along the axial direction of the guide bar 4 and is used for guiding the metal wires 42 when they extend out of the catheter 3 .

[0042] The basket assembly 100 further includes a movable inner tube 5 , which is received in the sheath tube 1 and forms a sliding connection with the sheath tube 1 , and the catheter 3 is received in the movable inner tube 5 and forms a sliding connection with the movable inner tube 5 .

[0043] The gap between the sheath tube 1 and the movable inner tube 5 forms a water injection channel 101. The movable inner tube 5 is provided with an integral inner cavity for accommodating surgical instruments. The portion of the inner cavity between the tube wall of the movable inner tube 5 and the surgical instruments is used to form a drainage channel 102.

[0044] It should be noted that the material of the basket assembly 100 must reach medical grade, which is easy to understand.

[0045] Please combine Figure 3 As shown, when the basket assembly 100 is in use, the movable inner tube 5 is integrally inserted into the sheath tube 1, and the movable inner tube 5 and the sheath tube 1 form a sliding connection, and the gap between the two forms a water inlet channel. In addition to providing a channel for the movement of surgical instruments, the rest of the space in the movable inner tube 5 can be used as a drainage channel.

[0046] The operation method is: first, the metal wire 42 is surrounded by a cage-like structure and pushed out of the catheter 3 until it is outside the shield 2. At this time, the metal wire 42 restores the memory shape in the absence of the wrapping force of the catheter 3 and the shield 2 and opens into a cage shape to catch the stone. After the stone is caught, the cage-like structure (net basket 422) surrounded by the metal wire 42 is pulled back. When it is pulled back to the shield 2, the opening of the shield 2 is expanded due to the tension, so that the cage-like structure surrounded by the metal wire 42 is located in the shield 2. At this time, the shield 2 wraps the net basket 422 with the stone, thereby forming a relatively closed surgical space.

[0047] After the shield 2 is unfolded into a trumpet shape, in addition to being able to guide the direction of water flow movement and thus form a water circulation and barrier, the shield 2 itself can also play a certain blocking role on the stone crushing energy and high-temperature tissue fluid / steam generated by the electrode and the optical fiber head, which can not only facilitate the capture of stones 10 and the collection of stones, but also prevent the shock waves generated by the stones from damaging the human tissues around the stones, and can also collect the high-temperature steam generated by the stone crushing of the electrode assembly or the optical fiber assembly in the shield 2, so as to facilitate the direct extraction of the high-temperature steam. The water circulation formed by the physiological saline and tissue fluid not only plays a certain barrier role in coordination with the coating 23, preventing the shock waves generated by the stone crushing from damaging the human tissues around the stone 10, but also can quickly take away the heat generated by the electrode assembly or the optical fiber assembly during the stone crushing, and reduce the temperature of the tissue fluid around the stone. Since the stone 10 is inside the basket 422, the stone crushing process is carried out inside the basket 422. After the stone crushing is completed, in order to remove the stone, the entire basket assembly 100 is extracted from the body, and the shield 2 can prevent excessive crushing and small stones from leaking out of the shield 2, thereby improving the stone removal efficiency. The high-temperature tissue fluid and high-temperature steam generated by the lithotripsy of the electrode assembly or the optical fiber assembly are also located inside the shield 2. Therefore, at this time, the high-temperature tissue fluid and high-temperature steam can be relatively quickly drawn away inside the shield 2 without overflowing outside the shield 2, causing less damage to human tissue. That is, the shield 2 combined with the basket 422 can better limit the stones, making the stone removal more accurate and efficient. Moreover, the water injected by the shield 2 to the sheath 1 can effectively form a water circulation path, effectively isolating the heat from overflowing and damaging normal body tissues, that is, effectively improving safety. After the stone removal is completed, the basket 422 is withdrawn into the catheter 3, and the internal thrust on the support bar 22 disappears. Under the action of the elastic restoring force of the coating 23 to restore the elastic deformation, the support bar 22 shrinks back to the initial state, and can be withdrawn together with the sheath 1.

[0048] An embodiment of the present invention further provides a stone crushing and stone clearing protection device, comprising the above-mentioned basket assembly 100 provided by the present invention. The structure of the basket assembly 100 is the above-mentioned structure provided by the present invention, which will not be repeated here.

[0049] Compared with the prior art, in the basket assembly and the lithotripsy and stone-removing protection device of the present invention, the shield includes an annular tube body connected to the end of the sheath tube, a plurality of support bars extending from one end of the tube body away from the sheath tube, and a film; the support bars are made of an elastic material, and the plurality of support bars are spaced apart along the end of the tube body and jointly form an annular structure. The film is an annular film made of an elastic material. The film surrounds the annular structure formed by the support bars and is fixedly attached to the support bars; when the annular structure formed by the support bars receives a thrust force from the inside to the outside (such as a cage-shaped basket), the support bars expand outward into a trumpet shape. When the thrust force disappears, the support bars return to the initial state under the elastic restoring force of the film. Through the design of the above structure, when the sheath tube reaches the stone position during use, other instruments inside the sheath tube are operated to extend out of the sheath tube to push against the support bars to expand outward into a trumpet shape. The film stretches and generates elastic deformation as the support bars expand. At this time, the trumpet-shaped structure formed by the support bars and the film jointly form a protective cover structure to isolate the hot steam or high-temperature water space generated by the thermal laser. At the same time, the high-temperature water is removed in real time through the water return lumen (drainage water path) under negative pressure. Thus, the vaporized water, laser high temperature, and stone fragments during the high-temperature stone-removing process are isolated in a limited space and removed synchronously. During the stable water circulation process of pumping away the high-temperature tissue fluid and high-temperature steam, it is possible to avoid the human tissue from being damaged by the overflowing high temperature or the impact of the stone fragments on the surrounding area, and the safety is higher.

[0050] The above are only embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A basket assembly, used in a stone crushing and stone cleaning protection device, It is characterized in that The basket assembly includes a sheath tube and a shield; The sheath is used to introduce surgical instruments; The shield includes an annular tube body connected to the end of the sheath tube, a plurality of support bars extending from one end of the tube body away from the sheath tube, and a coating; the support bars are made of elastic material, and a plurality of the support bars are spaced apart along the end of the tube body and together form an annular structure; the coating is an annular film made of elastic material, and the coating is arranged around the annular structure formed by the support bars and is fitted and fixed to the support bars; when the annular structure formed by the support bars is subjected to a thrust from the inside to the outside, the support bars expand outward in a trumpet shape, and when the thrust disappears, the support bars return to their initial state due to the elastic restoring force of the coating.

2. The basket assembly according to claim 1, It is characterized in that The shield is formed by extending the sheath tube, and the shield, the tube body and the support bar are an integrally formed structure.

3. The basket assembly according to claim 2, It is characterized in that The outer diameter of the tube at the end of the annular structure formed by all the support bars in the initial state is smaller than the outer diameter of the tube of the sheath tube.

4. The basket assembly according to claim 1, It is characterized in that The basket assembly also includes a catheter and a guide bar; the catheter is received in the sheath tube and forms a sliding connection with the sheath tube, and the guide bar is received in the catheter and forms a sliding connection with the catheter; the guide bar includes a guide bar body and a plurality of metal wires extending from the end of the guide bar body, the metal wires are made of shape memory material, a plurality of the metal wires are distributed at intervals along the circumferential side of the end of the guide bar body, and all the ends of the metal wires away from the guide bar body are connected to each other; when the metal wires are received in the catheter, the plurality of the metal wires respectively abut against the inner side of the catheter and extend in an axial spiral along the catheter; when the metal wires slide to the outside of the catheter and are located outside the sheath tube, all the metal wires return to their respective memory shapes and together form a cage-shaped basket with a receiving space; the length of the basket along the axial direction of the sheath tube is greater than the length of the support bar along the axial direction of the sheath tube, and the basket abuts against the inner side of the support bar to expand the support bar to form a trumpet shape.

5. The basket assembly according to claim 1, It is characterized in that The length of the coating along the axial direction of the tube body is equal to the length of the support bar along the axial direction of the tube body.

6. The basket assembly according to claim 1, It is characterized in that The coating is attached to the outer circumference or the inner circumference of the annular structure formed by the support bars or between two adjacent support bars.

7. The basket assembly according to claim 4, It is characterized in that The metal wire is made of nickel-titanium memory alloy or stainless steel memory alloy.

8. The basket assembly according to claim 4, It is characterized in that The guide bar further comprises a hydrophilic soft head, which is formed by extending one end of the metal wires connected to each other along the axial direction of the guide bar.

9. The basket assembly according to claim 4, It is characterized in that the basket assembly further includes a movable inner tube, the movable inner tube is received in the sheath tube and forms a sliding connection with the sheath tube, and the catheter is received in the movable inner tube and forms a sliding connection with the movable inner tube; a water injection channel is formed by a gap between the sheath tube and the movable inner tube, and an integral inner cavity is provided in the movable inner tube, the inner cavity is used for receiving surgical instruments, and a part of the inner cavity between the tube wall of the movable inner tube and the surgical instruments is used for forming a drainage channel.

10. A stone lithotripsy and stone removal protection device It is characterized in that it includes the basket assembly according to any one of claims 1-9.

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