Catheter sheath

Abstract

The utility model relates to the technical field of medical instruments, in particular to a catheter sheath which comprises a guide wire, an expander and a sheath tube, the guide wire is used for being inserted into a human body, the expander sleeves the guide wire, the expander is provided with a first fixing part, the sheath tube sleeves the expander, the sheath tube is provided with a second fixing part, the first fixing part is detachably mounted in the second fixing part, and the second fixing part is detachably mounted in the second fixing part. And the dilator and the sheathing canal are guided by the guide wire to penetrate into a human body. The catheter sheath solves the problem that when an existing catheter sheath penetrates into the body of a patient, the dilator rotates and the sheath tube does not rotate along with the dilator, so that the dilator and the sheath tube cannot continue to penetrate into the human body, it is ensured that the sheath tube and the dilator can smoothly penetrate into the human body, and a channel for a surgical instrument to penetrate into the human body for surgical operation is established through the sheath tube subsequently.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a catheter sheath. Background Art

[0002] In endourological surgery, PCNL (percutaneous nephrolithotomy) is required to treat stones or remove foreign bodies through PCNL. When establishing the PCNL treatment channel, instruments such as puncture needles, guide wires, dilators and sheaths are required. First, the puncture needle is inserted into the kidney or urinary catheter, and then the guide wire is inserted. The dilator drives the sheath into the body under the guidance of the guide wire, and finally the guide wire and dilator are pulled out. The sheath provides a channel for entering and exiting or replacing various interventional devices.

[0003] Since the dilator needs to rotate as it is inserted into the body along the guidewire, the dilator and the sheath need to be rotated simultaneously to allow them to enter the body at the same time. In the prior art, the sheath and the dilator are fixed by fixed plates. Therefore, when the dilator is rotated so that the dilator rotates along the guidewire to enter the body, the sheath may not rotate with the dilator. When the dilator rotates but the sheath does not rotate, the dilator cannot continue to be inserted into the body along the guidewire, and the sheath cannot continue to be inserted into the body along with the dilator, which affects the subsequent insertion of other surgical instruments through the sheath for surgery.

[0004] Therefore, the existing technology still needs to be improved and developed. Utility Model Content

[0005] In view of the deficiencies of the prior art, the present application aims to provide a catheter sheath, which is intended to fix the dilator and the sheath tube so that the sheath tube rotates along with the dilator, thereby allowing the sheath tube to gradually follow the dilator into the human body.

[0006] The technical solution adopted by the present application to solve the technical problem is as follows: a catheter sheath for fixing a dilator and a sheath tube, comprising:

[0007] A guide wire, the guide wire being used for insertion into a human body;

[0008] An expander, the expander is sleeved on the guide wire and is provided with a first fixing member;

[0009] a sheath, the sheath being sleeved outside the dilator and provided with a second fixing member, the first fixing member being detachably mounted inside the second fixing member to fix the dilator on the sheath;

[0010] The dilator and the sheath are inserted into the human body under the guidance of the guide wire.

[0011] Furthermore, the first fixing member includes a plurality of fixing plates, which are installed on the outer ring of the expander. The second fixing member includes a plurality of receiving grooves, and each fixing plate is inserted into one of the receiving grooves to install the first fixing member in the second fixing member.

[0012] Furthermore, a blocking plate is slidably installed in the accommodating groove to prevent the fixing piece from sliding out of the accommodating groove, and the blocking plate slides in a direction perpendicular to the direction in which the fixing piece penetrates into the accommodating groove.

[0013] Furthermore, the second fixing member further includes a pull rod, one end of the pull rod is mounted on a side of the blocking plate away from the human body, and the other end of the pull rod passes through a side of the accommodating groove away from the human body.

[0014] Furthermore, a suction groove is provided on a side of the accommodating groove close to the human body, and a suction member is provided on a side of the blocking plate close to the human body, and the suction member is embedded in the suction groove.

[0015] Furthermore, the second fixing member further includes an elastic member, one end of the elastic member is fixed to the top end of the accommodating groove, and the other end of the elastic member is fixed to the pull rod.

[0016] Furthermore, the expander includes an expansion tube and an expansion seat, the expansion seat is arranged at an end of the expansion tube away from the human body, and the first fixing member is installed on the outer ring of the expansion seat.

[0017] Furthermore, the sheath tube includes a tube body and a sheath seat, the sheath seat is arranged at an end of the tube body away from the human body, and the second fixing member is installed on the outer ring of the sheath seat.

[0018] Furthermore, the guide wire includes a guiding section, and the dilator tube passes through the guiding section to guide the dilator and the sheath tube to penetrate into the human body through the guiding section.

[0019] Furthermore, the guide wire further includes a bending section, which is arranged at one end of the guide section extending into the human body to prevent the dilator and the sheath from continuing to extend into the human body.

[0020] Beneficial effects:

[0021] The present application provides a catheter sheath for fixing a dilator and a sheath tube, so that the sheath tube rotates along with the dilator, thereby allowing the sheath tube to gradually follow the dilator into the human body. The invention comprises a guide wire, a dilator and a sheath tube, wherein the guide section of the guide wire guides the dilator and the sheath tube into the patient's body, the dilator rotates along the guide wire to gradually penetrate into the human body, and the first fixing member of the first dilator is inserted into the second fixing member. By installing the first fixing member in the second fixing member, the dilator and the sheath tube are kept relatively fixed, thereby preventing the dilator and the sheath tube from rotating relative to each other, causing the dilator to be unable to continue to extend into the body along the guide wire, and the sheath tube to be unable to continue to extend into the body following the dilator, thereby affecting the subsequent process of inserting other surgical instruments through the sheath tube for surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a catheter sheath according to an embodiment of the present application;

[0023] Figure 2 for Figure 1 A magnified schematic diagram of point A in the middle;

[0024] Figure 3 A schematic diagram of a guidewire of a catheter sheath according to an embodiment of the present application;

[0025] Figure 4 A schematic diagram of a dilator for a catheter sheath according to an embodiment of the present application;

[0026] Figure 5 A schematic diagram of a sheath tube of a catheter sheath according to an embodiment of the present application;

[0027] Figure 6 for Figure 5 Enlarged schematic diagram of point B in the middle.

[0028] Description of reference numerals:

[0029] 1. Guide wire; 11. Guide section; 12. Bending section; 2. Dilator; 21. First fixing member; 22. Dilator seat; 23. Dilator tube; 3. Sheath tube; 31. Second fixing member; 311. Accommodation groove; 312. Blocking plate; 313. Pull rod; 314. Pull cover; 315. Suction groove; 316. Elastic member; 32. Tube body; 33. Sheath seat. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions and advantages of this application clearer and more explicit, the following further describes this application in detail with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are only used to explain this application and are not intended to limit this application.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "push and pull" and "open and close" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "push and pull" and "open and close" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0033] The present invention provides a catheter sheath. To make the purpose, technical solution, and effects of the present invention more clear and explicit, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] like Figures 1 to 6As shown, a catheter sheath is used to fix the dilator and the sheath tube so that the sheath tube rotates along with the dilator, thereby allowing the sheath tube to gradually follow the dilator into the human body. The catheter sheath that fixes the dilator and the sheath tube includes a guide wire 1, a dilator 2 and a sheath tube 3. The guide wire 1 is used to insert into the human body. Because before the catheter sheath is inserted into the human body as a whole, it is necessary to first establish a path for penetrating the human body through the guide wire 1, thereby guiding the other structures of the catheter sheath to gradually penetrate the human body along the guide wire 1, thereby avoiding the catheter sheath from accidentally injuring other parts of the human body during the process of penetrating the human body, causing unnecessary damage to the patient. The dilator 2 is sleeved on the guide wire 1, and then the dilator 2 is inserted into the human body along the guide wire 1. At the same time, the sheath tube 3 is sleeved outside the dilator 2, and the sheath tube 3 follows the dilator 2 and penetrates into the human body under the guidance of the guide wire 1, thereby establishing a channel for other surgical instruments for performing surgical operations to penetrate the human body through the sheath tube 3. The dilator 2 is gradually extended into the human body by gradually rotating along the guidewire 1. To ensure that the sheath 3 can also be gradually extended into the human body, it is necessary to ensure that the sheath 3 can rotate along with the dilator 2. Therefore, the sheath 3 and the dilator 2 must be relatively fixed to prevent relative movement between the sheath 3 and the dilator 2. Therefore, in this embodiment, the dilator 2 is provided with a first fixing member 21, and the sheath 3 is provided with a second fixing member 31. The first fixing member 21 is detachably mounted within the second fixing member 31. By installing the first fixing member 21 within the second fixing member 31, the dilator 2 is fixed to the sheath 3, thereby allowing the sheath 3 to rotate with the dilator 2 and gradually extend into the human body.

[0035] Specifically, in order to install the first fixing member 21 in the second fixing member 31, it is necessary to first insert the first fixing member 21 into the second fixing member 31. Therefore, in the present application, the first fixing member 21 includes a plurality of fixing plates, which are installed on the outer ring of the expander 2. The second fixing member 31 includes a plurality of accommodating grooves 311, and each fixing plate is inserted into an accommodating groove 311 to install the first fixing member 21 in the second fixing member 31. In this embodiment, the first fixing member 21 is provided with two fixing plates, which are installed on both sides of the dilator 2 with the central axis of the dilator 2 as the axis of symmetry, and are specifically installed on the end of the dilator 2 away from the human body. Similarly, the accommodating groove 311 is installed on both sides of the sheath tube 3 with the axis of symmetry of the sheath tube 3 as the central axis, and is specifically installed on the end of the sheath tube 3 away from the human body. When the sheath tube 3 is sleeved on the dilator 2, the dilator 2 is rotated so that the fixing plate penetrates into the accommodating groove 311, so that the first fixing member 21 is installed on the second fixing member 31. When the dilator 2 needs to be pulled out of the sheath tube 3, the dilator 2 is rotated in the opposite direction relative to the direction in which the fixing plate penetrates into the accommodating groove 311, so that the fixing plate slides out of the accommodating groove 311, and then the dilator 2 is pulled out of the accommodating groove 311, and finally the dilator 2 and the sheath tube 3 are separated.

[0036] When the fixing piece is inserted into the receiving groove 311, in order to prevent the fixing piece from sliding out of the receiving groove 311 when the dilator 2 drives the sheath tube 3 to rotate, a blocking plate 312 is slidably installed in the receiving groove 311 to prevent the fixing piece from sliding out of the receiving groove 311 through the blocking plate 312. At this time, the blocking plate 312 slides in a direction perpendicular to the direction in which the fixing piece penetrates the receiving groove 311. Only when the blocking plate 312 is needed to prevent the fixing piece from sliding out, slide the blocking plate 312 first. Figure 6 As shown, a gap is formed between the blocking plate 312 and the receiving groove 311 for the fixing plate to penetrate into the receiving groove 311. When the fixing plate is completely penetrated into the receiving groove 311, the blocking plate 312 is slid to the original position, thereby preventing the sliding of the fixing plate through the blocking plate 312.

[0037] Since the blocking plate 312 is slidably mounted in the receiving groove 311, it is not convenient to directly operate the blocking plate 312 to slide. In order to facilitate the sliding of the blocking plate 312, the second fixing member 31 further includes a pull rod 313. The pull rod 313 is cylindrical. One end of the pull rod 313 is mounted on the side of the blocking plate 312 away from the human body, and the other end of the pull rod 313 passes through the side of the receiving groove 311 away from the human body. Figure 6 As shown, by pulling the pull rod 313, the blocking plate 312 slides within the receiving groove 311, allowing the fixing plate to enter the receiving groove 311 or being blocked by the blocking plate 312 to prevent the fixing plate from sliding out of the receiving groove 311, thereby maintaining the relative fixation of the dilator 2 and the sheath tube 3 and preventing relative sliding between the dilator 2 and the sheath tube 3. At the same time, to facilitate the medical staff to pull the pull rod 313, the end of the pull rod 313 away from the human body extends outward to form a pull cover 314, allowing the medical staff to directly pull the pull cover 314 to drive the pull rod 313 and the blocking plate 312 to slide.

[0038] When the fixing plate passes through the receiving groove 311, in order to enable the blocking plate 312 to return to its original position in time to block the fixing plate, a suction groove 315 is provided on the side of the receiving groove 311 close to the human body, and a suction member (not shown in the figure) is provided on the side of the blocking plate 312 close to the human body. Specifically, when the fixing plate passes through the receiving groove 311, the medical staff loosens the pull cover 314, and the suction groove 315 attracts the suction member, so that the suction member moves toward the direction of the suction groove 315 and embeds into the suction groove 315, thereby driving the blocking plate 312 back to its original position, forming a barrier to the fixing plate passing through the receiving groove 311.

[0039] When the locking cam 314 is in the unlock state, the locking cam 314 is in the unlock state, and the locking cam 314 is in the unlock state, so that the locking cam 314 is unlocked. Under the suction action of the groove 315, the suction member drives the blocking plate 312 to slide toward the original position. At the same time, under the elastic force of the elastic member 316, the elastic member 316 drives the pull cover 314 to move in the direction close to the human body, thereby assisting the blocking plate 312 to slide to the original position. The provision of the elastic member 316 can also ensure that only a certain pulling force is applied to pull the pull cover 314 to drive the pull rod 313 and the blocking plate 312 to slide, thereby avoiding the blocking plate 312 from sliding due to misoperation, so that a gap is formed between the blocking plate 312 and the accommodating groove 311, causing the fixing plate to slide out of the gap, thereby further ensuring that the fixing plate is fixed in the accommodating groove 311, so that the dilator 2 and the sheath 3 remain relatively fixed and do not rotate relative to each other.

[0040] In this embodiment, the dilator 2 includes an expansion tube 23 and an expansion seat 22. The expansion seat 22 is disposed at the end of the expansion tube 23 away from the human body, and the first fixing member 21 is mounted on the outer ring of the expansion seat 22. Meanwhile, the sheath tube 3 includes a tube body 32 and a sheath seat 33. The sheath seat 33 is disposed at the end of the tube body 32 away from the human body, and the second fixing member 31 is mounted on the outer ring of the sheath seat 33. When the sheath tube 3 is mounted on the dilator 2, the tube body 32 is mounted on the expansion tube 23. After the mounting is completed, the expansion tube 23 is rotated, driving the expansion seat 22 and the first fixing piece mounted on the expansion seat 22 to rotate, so that the fixing piece in the first fixing member 21 penetrates the receiving groove 311 in the second fixing member 31, thereby maintaining the relative fixation of the dilator 2 and the sheath tube 3.

[0041] The dilator 2 and the sheath 3 need to be guided by the guide wire 1 to penetrate the human body. Specifically, the guide wire 1 includes a guide section 11, such as Figure 3 As shown, the expansion tube 23 of the expander 2 penetrates into the guide section 11, and then the expansion tube 23 rotates along the guide wire 1 and gradually slides along the guide wire 1 toward the deep human body, driving the tube body 32 arranged thereon to move toward the deep human body, thereby guiding the expander 2 and the sheath 3 to penetrate into the human body through the guide section 11. After the sheath 3 and the expander 2 penetrate into the human body, the guide wire 1 and the expander 2 are pulled out, and the sheath 3 is left in the human body, thereby establishing a channel for other surgical instruments for performing surgical operations to penetrate into the human body.

[0042] In order to limit the depth of the sheath 3 and the dilator 2 penetrating into the human body and prevent the sheath 3 and the dilator 2 from penetrating too deeply into the human body and causing unnecessary harm to the patient, the guide wire 1 also includes a bending section 12, which is arranged at the end of the guide section 11 extending into the human body. The bending section 12 is used to prevent the dilator 2 and the sheath 3 from continuing to extend into the human body, preventing the dilator 2 and the sheath 3 from penetrating too deeply into the human body.

[0043] In summary, when the catheter sheath for fixing the dilator and sheath in the present application is needed to penetrate the human body to establish a channel for surgical instruments to penetrate the human body for surgical operations, the guide wire 1 is first inserted into the human body, and then the tube body 32 is sleeved on the dilator tube 23. After the sleeve is completed, the dilator tube 23 is rotated and the pull cover 314 is pulled at the same time, so that the blocking plate 312 slides away from the human body, forming a gap between the blocking plate 312 and the receiving groove 311. In this way, when the dilator tube 23 is rotated, the fixing piece on the first fixing member 21 passes through the gap and enters the receiving groove 311. When the fixing piece completely enters the receiving groove 311, the pull cover 314 is released, and the blocking plate 312 slides to its original position under the action of the suction groove 315 and the suction member. At the same time, the elastic member 316 drives the pull cover 314 to move towards the human body, helping the blocking plate 312 to return to its original position. When the blocking plate 312 returns to its original position, the blocking plate 312 blocks the fixing plate so that the fixing plate can no longer slide out of the accommodating groove 311, thereby completing the relative fixation of the dilator 2 and the sheath 3. At this time, the dilator 23 is rotated so that the dilator 23 slides along the guide wire 1 and gradually extends into the human body, guiding the sheath 3 and the dilator 2 to gradually extend into the human body.

[0044] When the sheath 3 and the dilator 2 penetrate to the designated position of the human body, the pull cover 314 is pulled again, so that the blocking plate 312 slides again to form a gap between the blocking plate 312 and the receiving groove 311, and then the dilator 23 is rotated to make the fixing plate slide out of the receiving groove 311, thereby releasing the relative fixation of the dilator 2 and the sheath 3, and finally the dilator 2 and the guide wire 1 are pulled out of the human body together, and the sheath 3 is left in the body, thereby completing the establishment of a channel for the surgical instrument to penetrate the human body.

[0045] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, they can make improvements or changes based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A catheter sheath, characterized in that: include: A guide wire, the guide wire being used for insertion into a human body; an expander, the expander being sleeved on the guide wire and provided with a first fixing member; a sheath, the sheath being sleeved outside the dilator and provided with a second fixing member, the first fixing member being detachably mounted inside the second fixing member to fix the dilator on the sheath; The dilator and the sheath are inserted into the human body under the guidance of the guide wire.

2. The catheter sheath according to claim 1, wherein The first fixing member includes a plurality of fixing plates, which are installed on the outer ring of the expander. The second fixing member includes a plurality of receiving grooves, and each fixing plate is inserted into one of the receiving grooves to install the first fixing member in the second fixing member.

3. The catheter sheath according to claim 2, characterized in that A blocking plate is slidably installed in the accommodating groove to prevent the fixing piece from sliding out of the accommodating groove. The blocking plate slides in a direction perpendicular to the direction in which the fixing piece penetrates into the accommodating groove.

4. The catheter sheath according to claim 3, characterized in that The second fixing member further includes a pull rod, one end of which is mounted on a side of the blocking plate away from the human body, and the other end of which passes through a side of the accommodating groove away from the human body.

5. The catheter sheath according to claim 4, characterized in that A suction groove is provided on a side of the accommodating groove close to the human body, and a suction piece is provided on a side of the blocking plate close to the human body. The suction piece is embedded in the suction groove.

6. The catheter sheath according to claim 5, characterized in that The second fixing member further includes an elastic member, one end of which is fixed to the top end of the accommodating groove, and the other end of which is fixed to the pull rod.

7. The catheter sheath according to any one of claims 1 to 6, characterized in that: The expander includes an expansion tube and an expansion seat. The expansion seat is arranged at an end of the expansion tube away from the human body, and the first fixing member is installed on the outer ring of the expansion seat.

8. The catheter sheath according to claim 7, characterized in that The sheath tube includes a tube body and a sheath seat. The sheath seat is arranged at an end of the tube body away from the human body, and the second fixing member is installed on the outer ring of the sheath seat.

9. The catheter sheath according to claim 8, characterized in that The guide wire includes a guiding section, and the dilator tube passes through the guiding section to guide the dilator and the sheath tube to penetrate into the human body through the guiding section.

10. The catheter sheath according to claim 9, characterized in that The guide wire further comprises a bending section, which is arranged at one end of the guide section extending into the human body to prevent the dilator and the sheath from continuing to extend into the human body.

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