Catheter sheath comprising end thickened guide wire

Abstract

The utility model relates to the technical field of medical instruments, and particularly provides a catheter sheath comprising an end thickened guide wire, the catheter sheath comprises a variable-diameter guide wire, an expander and a sheath tube, the variable-diameter guide wire comprises a guide section far away from a patient and a thickened section close to the patient, the diameter of the thickened section is larger than that of the guide section, the expander penetrates into the variable-diameter guide wire from the end of the guide section, and the sheath tube is arranged in the variable-diameter guide wire. The dilator abuts against the end, away from the patient, of the thickening section, the dilator is sleeved with the sheathing canal, and the sheathing canal is detachably connected with the dilator. The problem that an existing catheter sheath penetrates into the body of a patient too deeply to damage the patient is solved, the penetrating depth of the dilator and the sheathing canal is controlled through the variable-diameter guide wire, and it is ensured that the sheathing canal penetrates into the designated position.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a catheter sheath comprising a thickened guide wire at the end. 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. The puncture needle is first inserted into the kidney. After the puncture needle is inserted, the inner core of the puncture needle is pulled out and the outer sheath of the puncture needle is retained. When urine flows out of the outer sheath, it means that the puncture is successful. Then the guide wire is inserted through the outer sheath of the puncture needle. Under the guidance of the guide wire, the dilator drives the sheath into the body. Finally, the guide wire and dilator are pulled out. The sheath provides a channel for entering and exiting or replacing various interventional equipment, such as instruments used for lithotripsy.

[0003] However, when the dilator and sheath are inserted into the body through the guidewire, the dilator may penetrate too deeply into the body and mistakenly enter the inferior vena cava or colon, causing damage to the inferior vena cava and colon. In order to prevent the dilator from penetrating too deeply, the existing solutions usually involve inserting the dilator multiple times or setting a bend at the end of the guidewire. Multiple penetrations of the dilator can easily tear the renal parenchyma and cause bleeding. When a bend is set at the end of the guidewire, although the bend can to a certain extent prevent the dilator from continuing to penetrate, the guidewire is made of soft material. If the force is too strong when inserting the dilator, the bend of the guidewire will straighten under the penetration of the dilator, and the dilator will continue to penetrate into the body along the guidewire. At this time, the guidewire cannot block the dilator. Penetrating too deeply into the body will cause damage, and the process of the bend of the guidewire straightening from the bend to the straightness will also cause secondary damage to the patient.

[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 comprising a guide wire with a thickened end, which is intended to limit the penetration depth of the dilator when it penetrates into the body along the guide wire, thereby avoiding damage to the patient.

[0006] The technical solution adopted by the present application to solve the technical problem is as follows: a catheter sheath including a guide wire with a thickened end, comprising:

[0007] A variable diameter guidewire, comprising a guide segment away from the patient and a thickened segment closer to the patient, wherein the diameter of the thickened segment is larger than the diameter of the guide segment;

[0008] a dilator, the dilator being inserted into the reducing guidewire from the end of the guide segment and abutting against the end of the thickened segment facing away from the patient;

[0009] A sheath is sleeved outside the dilator and is detachably connected to the dilator.

[0010] Furthermore, the thickened section is provided with an extension portion, and the extension portion is connected to the guide section;

[0011] The diameter of the extension portion gradually decreases from an end that penetrates into the body to an end that is away from the body.

[0012] Furthermore, the thickened section is also provided with a suction member to attract the expander and assist the expander in penetrating.

[0013] Furthermore, the expander includes a connecting end, which is arranged at an end of the expander close to the patient, and abuts against an end of the thickened section away from the patient.

[0014] Furthermore, the connecting end is provided with an induction member, and the induction member is made of a magnetic material, so that the attraction member assists the expansion device in penetrating by attracting the induction member.

[0015] Furthermore, the dilator further comprises an expansion tube, the expansion tube is formed by extending from one end of the connecting end away from the patient, and the sheath is sleeved on the expansion tube.

[0016] Furthermore, the expander further comprises an expansion seat, which is cylindrical and arranged at the end of the expansion tube away from the patient, and an outer ring of the expansion seat is provided with a snap-fit groove;

[0017] The sheath tube further comprises a sheath seat, which is detachably mounted on the expansion seat.

[0018] Furthermore, a handle is installed on the outer ring of the sheath seat.

[0019] Furthermore, the sheath tube further includes a tube body, and the tube body is sleeved on the expansion tube.

[0020] Furthermore, the variable diameter guidewire further includes a bending section, and the bending section is arranged at an end of the thickened section close to the patient.

[0021] Beneficial effects:

[0022] The present application provides a catheter sheath including a thickened end guide wire, which is used to establish an insertion channel in the patient's body for other medical devices to penetrate the patient's body for surgical operations. It includes a reducing guide wire, a dilator and a sheath. The guiding section of the reducing guide wire guides the dilator and the sheath to penetrate the patient's body, while the thickened section of the reducing guide wire blocks the dilator and the sheath from penetrating further into the patient's body, limiting the dilator and the sheath to a specified depth in the patient's body, preventing the dilator and the sheath from penetrating too deeply into the patient's body and causing damage to the patient. At the same time, it can also guide the dilator and the sheath to penetrate to a specified depth, shortening the time for the catheter sheath to penetrate the patient's body, improving the success rate of the dilator and the sheath penetrating the specified position in the patient's body, and avoiding additional damage and pain to the patient due to failure of the catheter sheath to penetrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of a catheter sheath including a guide wire with a thickened end in the present invention;

[0024] Figure 2 Schematic diagram of the variable diameter guide wire in the present invention;

[0025] Figure 3 This is a schematic diagram of the sheath being sleeved on the dilator in the present invention;

[0026] Figure 4 Schematic diagram of the expander in the present invention;

[0027] Figure 5 It is a schematic diagram of the sheath tube in the present utility model.

[0028] Description of reference numerals:

[0029] 1. Reduced diameter guide wire; 11. Guide section; 12. Thickened section; 121. Extension section; 122. Suction member; 13. Bending section; 2. Dilator; 21. Dilator seat; 22. Connecting end; 221. Sensing member; 23. Dilator tube; 3. Sheath tube; 31. Sheath seat; 311. Handle; 32. Tube body. 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 including a thickened guidewire. 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 merely for the purpose of explaining the present invention and are not intended to limit the present invention.

[0034] like Figures 1 to 5As shown, a catheter sheath including a thickened end guidewire is used to limit the penetration depth of the dilator when it penetrates into the body along the guidewire to avoid causing damage to the patient. The catheter sheath including the thickened end guidewire includes a reducing guidewire 1, a dilator 2 and a sheath tube 3. The reducing guidewire 1 includes a guide segment 11 away from the patient and a thickened segment 12 close to the patient. The diameter of the thickened segment 12 is larger than the diameter of the guide segment 11. The dilator 2 and the sheath tube 3 are guided into the patient's body by the guide segment 11, and the thickened segment 12 blocks the dilator 2 from continuing to slide along the reducing guidewire 1, thereby preventing the dilator 2 and the sheath tube 3 from penetrating too deeply into the body and causing damage to the patient. At this time, the diameter of the thickened segment 12 is larger than the sliding hole of the dilator 2. Then, when the dilator 2 slides to contact and abut the end of the thickened segment 12 away from the patient, the dilator 2 cannot continue to slide into the patient's body due to the obstruction of the thickened segment 12, thereby limiting the depth of the dilator 2 into the patient's body. The sheath tube 3 is sleeved on the outside of the dilator 2, and the sheath tube 3 is detachably connected to the dilator 2. When the dilator 2 drives the sheath tube 3 to penetrate the patient's body, the sheath tube 3 and the dilator 2 need to move together. At this time, the sheath tube 3 needs to be connected to the dilator 2 to avoid the penetration of the sheath tube 3 being affected by the relative movement between the sheath tube 3 and the dilator 2. After the dilator 2 and the sheath tube 3 have completed the penetration, it is only necessary to leave the sheath tube 3 in the body to provide a penetration channel for subsequent medical devices to penetrate the patient's body. At this time, the guide wire and the dilator 2 need to be withdrawn. Therefore, when the dilator 2 and the sheath tube 3 have completed the penetration, the connection between the dilator 2 and the sheath tube 3 needs to be released so that the reducing guide wire 1 and the dilator 2 can be withdrawn from the body in time while the sheath tube 3 is retained in the body.

[0035] Furthermore, to prevent the dilator 2 from directly impacting the thickened section 12 and thereby damaging the dilator 2 and the reducing guidewire 1 when the dilator 2 slides along the reducing guidewire 1 and contacts the thickened section 12, and to ensure a smooth connection between the thickened section 12 and the guide section 11, the thickened section 12 is provided with an extension portion 121. The extension portion 121 is designed to have a variable diameter and is connected to the guide section 11. Specifically, the diameter of the extension portion 121 gradually decreases from the end that penetrates deeply into the body to the end that is distal to the body, and the diameter of the portion of the extension portion 121 that contacts the guide section 11 remains consistent with that of the guide section 11. This makes the connection between the thickened section 12 and the guide end smoother, and prevents the patient from being scratched by the sharp corners formed by the sudden change in diameter between the guide section 11 and the thickened section 12 when the variable diameter guide wire 1 penetrates the patient's body; at the same time, the expander 2 can be gradually blocked by the extension portion 121 with a gradually changing diameter. When the aperture of the sliding hole of the expander 2 is equal to the diameter of the extension portion 121, the extension portion 121 blocks the expander 2, and prevents the expander 2 and the variable diameter guide wire 1 from being damaged due to the direct impact of the expander 2 on the thickened section 12 when the expander 2 slides to contact the thickened section 12.

[0036] At the same time, in order to allow the dilator 2 to penetrate into the designated position in the patient's body more smoothly, the thickening section 12 is also provided with a suction member 122. The suction member 122 is used to attract the dilator 2. When the dilator 2 is close to the thickening section 12, the suction member 122 begins to attract the dilator 2. Under the suction action of the suction member 122, the dilator 2 can more easily penetrate into the patient's body to reach the designated position, shortening the time for penetrating the dilator 2. At the same time, when the suction member 122 sucks the dilator 2, it can also give feedback to the medical staff who operates the dilator 2 to penetrate the patient's body, so that the medical staff can confirm as soon as possible that the dilator 2 and the sheath 3 have reached the designated position. In addition, when the dilator 2 and the sheath 3 are inserted and the dilator 2 and the reducing guidewire 1 need to be removed from the body, the attracting member 122 on the reducing guidewire 1 attracts the dilator 2. Therefore, when the reducing guidewire 1 and the dilator 2 are removed, the reducing guidewire 1 and the dilator 2 will not separate during the process of leaving the patient's body. This makes the process of removing the reducing guidewire 1 and the dilator 2 smoother, and will not affect the removal process due to the separation of the reducing guidewire 1 and the dilator 2 during the removal process, nor will it cause damage to the patient during the removal process, thereby reducing the pain of the patient when inserting the sheath 3. Therefore, in order to realize the attraction function of the attracting member 122, the attracting member 122 is made of magnetic material, and the corresponding position on the dilator 2 also contains a material that is easily attracted by the magnetic material.

[0037] Furthermore, the expander 2 includes a connecting end 22, which is arranged at the end of the expander 2 close to the patient, and the connecting end 22 abuts against the end of the thickening section 12 facing away from the patient, that is, when the expander 2 penetrates into the body, after the connecting end 22 contacts the extension portion 121 of the thickening section 12, the connecting end 22 continues to slide along the extension portion 121 until the diameter of the extension portion 121 is the same as the diameter of the sliding hole of the expander 2. The extension portion 121 blocks the connecting end 22, thereby limiting the depth of the expander 2 penetrating into the patient's body. At the same time, the connecting end 22 is provided with a sensing member 221. When the expander 2 approaches the thickening section 12, the suction member 122 attracts the sensing member 221 on the connecting end 22, so that the expander 2 slides in the direction of penetrating into the body, thereby allowing the expander 2 to further penetrate into the body until the extension portion 121 blocks the connecting end 22. In addition, the suction member 122 can also attract the sensing member 221, so that the reducing guide wire 1 and the expander 2 become a whole, avoiding the separation of the expander 2 and the reducing guide wire 1 when the expander 2 and the reducing guide wire 1 are pulled out of the body. After the reducing guide wire 1 and the expander 2 are pulled out, a force in the opposite direction is applied to the reducing guide wire 1 and the expander 2 at the same time, so that the suction member 122 can be separated from the sensing member 221, and then the reducing guide wire 1 and the expander 2 can be separated, so that the reducing guide wire 1 and the expander 2 can be used next time.

[0038] The dilator 2 also includes an expansion tube 23, which extends from the end of the connecting end 22 facing away from the patient. The expansion tube 23 is elongated and the sheath tube 3 is mounted on the expansion tube 23. The expansion tube 23 is driven into the patient's body by the connecting end 22, thereby allowing the sheath tube 3 mounted outside the expansion tube 23 to penetrate the patient's body. To prevent the expansion tube 23 and the sheath tube 3 from moving relative to each other during insertion, which could result in failure of the sheath tube 3 to penetrate the patient's body, the sheath tube 3 needs to be fixed to the expansion tube 23 to prevent relative movement between the expansion tube 23 and the sheath tube 3. Therefore, in the present application, the dilator 2 also includes an expansion seat 21, which is arranged at the end of the expansion tube 23 away from the patient. The expansion seat 21 is cylindrical, and the outer ring of the expansion seat 21 is provided with a snap-fit groove, which is L-shaped for the sheath 3 to be inserted. The sheath 3 also includes a sheath seat 31, which is block-shaped. The sheath seat 31 can be detachably mounted on the expansion seat 21. Specifically, the sheath seat 31 can be detachably mounted in the snap-fit groove of the expansion seat 21. When the sheath 3 needs to be inserted into the patient's body through the dilator 2 , put the sheath tube 3 on the dilator 2, at this time the sheath seat 31 is inserted into the vertical part of the engagement groove of the dilator seat 21, that is, the part parallel to the length direction of the dilator 23, and then rotate the sheath tube 3 so that the sheath seat 31 is further inserted into the engagement groove, that is, the sheath seat 31 is inserted into the horizontal part of the engagement groove, that is, the part perpendicular to the length direction of the dilator 23, thereby installing the sheath seat 31 on the dilator seat 21, fixing the sheath tube 3 and the dilator 23, and keeping the sheath tube 3 and the dilator 23 moving synchronously. When the sheath tube 3 is inserted into the patient's body and the dilator 2 and the reducing guide wire 1 need to be pulled out, the sheath tube 3 is released from the dilator seat 21, and the fixation between the sheath tube 3 and the dilator 23 is released, so as to separate the dilator 2 and the sheath tube 3 and pull the dilator 2 and the reducing guide wire 1 out of the patient's body.

[0039] In order to facilitate the insertion of the dilator 2 into the patient's body, a handle 311 is installed on the outer ring of the sheath seat 31. Specifically, when the dilator 2 and the sheath 3 need to be inserted into the patient's body, the connecting end 22 is inserted into the reducing guide wire 1, and then the handle 311 is grasped and the sheath 3 and the dilator 2 are pushed, so that the dilator 2 is slowly inserted into the patient's body along the reducing guide wire 1. In addition, in order to allow the sheath 3 to remain in the body and provide space and channels for other medical devices to enter the patient's body, the sheath 3 also includes a tubular body 32. When the sheath 3 is inserted into the patient's body, the tubular body 32 provides space for the dilator 2. After the sheath 3 is inserted into the patient's body, the reducing guide wire 1 and the dilator 2 are pulled out first, and the dilator 2 in the tubular body 32 is pulled out. The tubular body 32 then establishes a channel for other medical devices to penetrate into the patient's body. At this time, other medical devices can be inserted into the patient's body through the tubular body 32. In order to further prevent the expander 2 from penetrating too deep, the variable diameter guide wire 1 also includes a bending section 13, which is arranged at the end of the thickened section 12 close to the patient. The bending section 13 can further block the penetration of the expander 2 when the thickened section 12 fails to block the expander 2.

[0040] To sum up, when it is necessary to use the catheter sheath including the end thickened guide wire in the present application to penetrate the patient's body so as to establish a channel for subsequent medical devices to penetrate the patient, the reducing guide wire 1 is first penetrated into the patient's body. When the reducing guide wire 1 penetrates to the specified position, the movement of the reducing guide wire 1 is stopped. At this time, the sheath tube 3 is placed on the dilator 2, and then the expansion seat 21 and the sheath seat 31 are installed to fix the sheath tube 3 and the dilator 2 to prevent the sheath tube 3 and the dilator 2 from moving relative to each other. After the installation is completed, the connecting end 22 of the dilator 2 is aligned with the reducing guide wire 1, and the sliding hole is inserted into the reducing guide wire 1, so that the dilator 2 and the sheath tube 3 are gradually penetrated into the patient's body along the reducing guide wire 1. When the dilator 2 approaches the thickened section 12, the suction member 122 attracts the sensing member 221 to assist the dilator 2 and the sheath tube 3 to penetrate to the specified position. When the dilator 2 reaches the specified position, the thickened section 12 blocks the dilator 2 from continuing to penetrate. After the dilator 2 and the sheath 3 are inserted, the installation of the dilator seat 21 and the sheath seat 31 is released, and then the reducing guide wire 1 and the dilator 2 are pulled out of the patient's body together, and the sheath 3 is left alone in the patient's body so that other medical devices can be inserted into the patient's body through the tube body 32 of the sheath 3.

[0041] 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 comprising a guide wire with a thickened end, characterized in that: include: A variable diameter guidewire, comprising a guide segment away from the patient and a thickened segment closer to the patient, wherein the diameter of the thickened segment is larger than the diameter of the guide segment; a dilator, the dilator being inserted into the reducing guidewire from the end of the guide segment and abutting against the end of the thickened segment facing away from the patient; A sheath is sleeved outside the dilator and is detachably connected to the dilator.

2. The catheter sheath comprising a guide wire with a thickened end according to claim 1, characterized in that: The thickened section is provided with an extension portion, and the extension portion is connected to the guide section; The diameter of the extension portion gradually decreases from an end that penetrates into the body to an end that is away from the body.

3. The catheter sheath comprising a guide wire with a thickened end according to claim 1, characterized in that: The thickened section is further provided with a suction piece to attract the expander and assist the expander in penetrating.

4. The catheter sheath comprising a guide wire with a thickened end according to claim 3, characterized in that: The expander includes a connecting end, which is arranged at an end of the expander close to the patient and abuts against an end of the thickened section away from the patient.

5. The catheter sheath comprising a guide wire with a thickened end according to claim 4, characterized in that: The connecting end is provided with an induction member made of a magnetic material, so that the attraction member assists the expansion device in penetrating by attracting the induction member.

6. The catheter sheath comprising a guide wire with a thickened end according to claim 4, characterized in that: The dilator further comprises a dilating tube, which is formed by extending from one end of the connecting end away from the patient, and the sheath is sleeved on the dilating tube.

7. The catheter sheath comprising a guide wire with a thickened end according to claim 6, characterized in that: The expander further comprises an expansion seat, which is cylindrical and arranged at the end of the expansion tube away from the patient, and an outer ring of the expansion seat is provided with a snap-fit groove; The sheath tube further comprises a sheath seat, which is detachably mounted on the expansion seat.

8. The catheter sheath comprising a guide wire with a thickened end according to claim 7, characterized in that: The outer ring of the sheath seat is provided with a handle.

9. The catheter sheath comprising a guide wire with a thickened end according to any one of claims 6 to 8, characterized in that: The sheath tube further comprises a tube body, and the tube body is sleeved on the dilation tube.

10. The catheter sheath comprising a guide wire with a thickened end according to claim 9, characterized in that: The variable diameter guide wire further includes a bending section, which is arranged at an end of the thickened section close to the patient.

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