Disposable catheter sheath assembly

Abstract

The utility model relates to the technical field of medical instruments, in particular to a disposable catheter sheath assembly. The catheter sheath assembly comprises a catheter sheath, a dilator, a locking mechanism and a first elastic body, a displacement cavity matched with the locking mechanism is formed in the near end of the outer wall of the catheter sheath, a locking hole is formed in the displacement cavity, and the locking mechanism can axially move in the displacement cavity and can be connected with the locking hole in a clamped mode; the first elastic body is arranged on the periphery of the dilator tube in a sleeving mode and located between the catheter sheath and the dilator, the far end of the first elastic body can abut against the near end of the catheter sheath, and the near end of the first elastic body can abut against the far end of the dilator handle. According to the catheter sheath assembly, automatic locking and unlocking of the dilator and the catheter sheath are achieved through cooperation of the first elastic body and the locking mechanism, and the catheter sheath assembly has the advantages of being simple in structure, convenient to operate and high in operation stability.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and particularly to a disposable catheter sheath assembly. Background Art

[0002] During interventional therapy, a catheter sheath assembly is needed to establish an implantation channel. A disposable vascular sheath assembly includes a catheter sheath and a dilator. It is inserted into a blood vessel or the urethra through a guide wire, and then the dilator is withdrawn, and the catheter sheath remains in the blood vessel or the urethra.

[0003] The existing catheter sheath and dilator usually adopt a threaded connection method to achieve locking and unlocking. During the operation, the operator needs to cooperate with both hands to achieve the locking and unlocking of the catheter sheath and the dilator, which has the problems of complex operation, time-consuming and laborious. Moreover, the hand that rotates the screw needs to rotate and apply an axial separating force, which is likely to cause the catheter sheath and the dilator to shake and touch the blood vessel wall or the urethral wall, resulting in spasm or injury of the blood vessel or the urethra.

[0004] Therefore, there is an urgent need for a disposable catheter sheath assembly with a simple structure, convenient operation and high operation stability. Utility Model Content

[0005] The purpose of this application is to provide a disposable catheter sheath assembly with a simple structure, convenient operation and high operation stability.

[0006] The embodiments of this application can be realized through the following technical solutions:

[0007] A disposable catheter sheath assembly includes a catheter sheath and a dilator. The dilator includes a dilator tube and a dilator handle. The dilator handle is connected to the proximal end of the dilator tube, and the outer diameter of the dilator handle is greater than the outer diameter of the dilator tube.

[0008] It further includes a locking mechanism and a first elastic body. A displacement cavity cooperating with the locking mechanism is provided at the proximal end of the outer wall of the catheter sheath. A locking hole is provided on the displacement cavity. The locking mechanism can axially displace in the displacement cavity and can be snap-connected with the locking hole. The first elastic body is sleeved on the outer periphery of the dilator tube and is located between the catheter sheath and the dilator. Its distal end can abut against the proximal end of the catheter sheath, and its proximal end can abut against the distal end of the dilator handle.

[0009] Further, the locking mechanism includes a locking slider and a pin shaft. The locking slider is provided with a through hole cooperating with the pin shaft. The pin shaft penetrates through the locking slider along the radial direction of the catheter sheath and is rotatably connected to the displacement cavity.

[0010] Further, the dilator further includes a mating portion, which is connected to the outer wall of the dilator tube and can abut against the distal end of the locking slider.

[0011] Further, the mating portion is of a trapezoidal structure with the trapezoidal surface facing the proximal end, and the locking mechanism is movably connected between the mating portion and the displacement cavity.

[0012] Further, the mating portion includes a first table surface, a transition surface, and a second table surface. The first table surface and the second table surface are arranged along the axial direction of the dilator tube and are transitioned through the transition surface;

[0013] The distance between the first table surface and the axis of the dilator tube is greater than the distance between the second table surface and the axis of the dilator tube.

[0014] Preferably, a limiting groove is formed on one side of the transition surface facing the locking mechanism, and the distal end of the locking slider moves in the limiting groove while rotating around the pin shaft.

[0015] Preferably, the locking mechanism includes a second elastic body. A blind hole is formed on one side of the locking slider facing the dilator tube, and the second elastic body can be accommodated in the blind hole, and its bottom end can abut against the second table surface.

[0016] Further, the locking slider is of a similar L-shaped structure, including a locking portion and a limiting portion. The locking portion can be engaged with the locking hole, and the distal end of the limiting portion is movably connected to the mating portion.

[0017] Further, the displacement cavity includes a communicating axial displacement cavity, a pin shaft displacement cavity, and a mating portion screwing-out cavity. The pin shaft displacement cavity is arranged on both sides of the axial displacement cavity, and the pin shaft can displace along the axial direction of the catheter sheath in the pin shaft displacement cavity;

[0018] The mating portion screwing-out cavity is arranged on the proximal side of the axial displacement cavity. The mating portion screwing-out cavity and the axial displacement cavity can form an L-shaped track, and the mating portion can be transferred from the axial displacement cavity into the mating portion screwing-out cavity.

[0019] Preferably, a circular limiting groove is formed on the side of the dilator handle facing the distal end. A part of the first elastic body is accommodated in the circular limiting groove, and its distal end can abut against the proximal end of the circular limiting groove.

[0020] The disposable catheter sheath assembly provided by the embodiments of the present application has at least the following beneficial effects:

[0021] In the catheter sheath assembly of the present application, the automatic locking and unlocking of the dilator and the catheter sheath are achieved through the cooperation of the first elastomer and the locking mechanism, which has the advantages of simple structure, convenient operation, and high operation stability;

[0022] In the present application, by setting the second elastomer, the locking slider can automatically pop out of the locking hole under the elastic action of the second elastomer to achieve the automatic locking of the catheter sheath and the dilator; by setting the first elastomer, after pressing the limiting part, the locking slider can move proximally under the elastic action of the first elastomer to achieve the automatic unlocking of the catheter sheath and the dilator, which has the advantages of time-saving, labor-saving, and single-handed operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is the overall structure diagram of the disposable catheter sheath assembly in the present application;

[0024] Figure 2 is the cross-sectional view of the disposable catheter sheath assembly in which the catheter sheath and the dilator are in the locked state in the present application;

[0025] Figure 3 is the cross-sectional view of the disposable catheter sheath assembly in which the catheter sheath and the dilator are in the unlocked state in the present application;

[0026] Figure 4 is the exploded view of the locking mechanism in the present application;

[0027] Figure 5 is the overall structure diagram of the dilator in the present application;

[0028] Figure 6 is the top view of the catheter sheath in the present application.

[0029] Reference numerals: 1, dilator; 11, dilator tube; 12, dilator handle; 121, annular limiting groove; 13, mating part; 131, first table surface; 132, transition surface; 133, second table surface; 2, catheter sheath; 3, locking mechanism; 31, locking slider; 311, locking part; 312, limiting part; 32, pin shaft; 33, second elastomer; 4, first elastomer; 6, displacement cavity; 61, axial displacement cavity; 62, pin shaft displacement cavity; 63, mating part screwing-out cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Hereinafter, the present application will be further described based on the preferred embodiments with reference to the drawings.

[0031] The terms used in this specification are for the purpose of describing the embodiments of the present application, but are not intended to limit the present application. Unless otherwise clearly specified and defined, the terms "arranged", "connected", and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present application can be specifically understood.

[0032] In addition, in the description of the embodiments of the present application, for the convenience of understanding, various components in the drawings are enlarged or reduced, but this approach is not intended to limit the protection scope of the present application.

[0033] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present application clearer, the technical solutions of the present application will be further described below with reference to the accompanying drawings and through specific embodiments. For the convenience of description, the terms "proximal end" and "distal end" are used in the following description, where the "proximal end" refers to the end close to the operator, and the "distal end" refers to the end far from the operator and deep into the body.

[0034] The present application provides a disposable catheter sheath assembly. Figure 1 The overall structure diagram and cross-sectional view of the disposable catheter sheath assembly in the present application are shown, as Figures 1-3 shown, the disposable catheter sheath assembly includes a dilator 1, a catheter sheath 2, a locking mechanism 3, and a first elastic body 4. Among them, the dilator 1 is coaxially arranged with the catheter sheath 2 and sleeved inside the catheter sheath 2. The catheter sheath 2 is used to establish a surgical channel, the locking mechanism 3 is used to lock and unlock the dilator 1 and the catheter sheath 2, and the first elastic body 4 cooperates with the locking mechanism 3 to achieve automatic locking and unlocking of the dilator 1 and the catheter sheath 2.

[0035] Specifically, as Figures 1-3 shown, the dilator 1 includes a dilator tube 11 and a dilator handle 12. The dilator handle 12 is connected to the proximal end of the dilator tube 11, and the outer diameter of the dilator handle 12 is greater than the outer diameter of the dilator tube 11.

[0036] Further, a displacement cavity 6 cooperating with the locking mechanism 3 is provided at the proximal end of the outer wall of the catheter sheath 2. An accusation is provided on the displacement cavity 6. The locking mechanism 3 can axially displace within the displacement cavity 6 and can be snap-connected with the locking hole, so as to realize the locking of the catheter sheath 2 and the dilator 1. The first elastic body 4 is sleeved on the outer periphery of the dilator tube 11 and is located between the catheter sheath 2 and the dilator 1. Its distal end can abut against the proximal end of the catheter sheath 2, and its proximal end can abut against the distal end of the dilator handle 12. The outer diameter of the dilator handle 12 is greater than the outer diameter of the dilator tube 11. When the locking mechanism 3 is not snap-connected with the locking hole, the elastic deformation force of the first elastic body 4 can push the dilator handle 12, and then drive the dilator 1 to move in the proximal direction.

[0037] As Figure 4 shown, the locking mechanism 3 includes a locking slider 31 and a pin shaft 32. The locking slider 31 is provided with a through hole cooperating with the pin shaft 32. The pin shaft 32 penetrates through the locking slider 31 in the radial direction of the catheter sheath 2 and is rotatably connected to the displacement cavity 6, so that the locking slider 31 can rotate around the pin shaft 32 within the displacement cavity 6, and further enable the locking slider 31 to switch between snap-connection and non-snap-connection with the locking hole, thereby realizing the locking and unlocking of the dilator 1 and the catheter sheath 2.

[0038] Further, the dilator 1 further includes a cooperating portion 13. The cooperating portion 13 is connected to the outer wall of the dilator tube 11 and can abut against the distal end of the locking slider 31. During the process of operating the dilator handle 12, the operator can cooperate with the locking structure 3 through the cooperating portion 13, so as to realize the axial displacement of the locking mechanism 3.

[0039] Further, as Figure 5 shown, the cooperating portion 13 is a trapezoidal structure, and the trapezoidal surface is arranged towards the proximal end. The locking mechanism 3 is movably connected between the cooperating portion 13 and the displacement cavity 6. The trapezoidal cooperating portion 13 can form a good cooperation with the locking slider 31 and can abut against the distal end of the locking slider 31 flexibly.

[0040] In some specific embodiments of the present application, the cooperating portion 13 includes a first table surface 131, a transition surface 132, and a second table surface 133. The first table surface 131 and the second table surface 133 are arranged along the axial direction of the dilator tube 11 and are transitioned through the transition surface 132. The distance between the first table surface 131 and the axis of the dilator tube 11 is greater than the distance between the second table surface 133 and the dilator tube 11, that is, the trapezoidal structure in the present application is composed of two table surfaces.

[0041] Further, as Figure 5 shown, in order to limit the moving range of the distal end of the locking slider 31, a limiting groove is provided on the side of the transition surface 132 facing the locking slider 31. The distal end of the locking slider 31 can move within the limiting groove while rotating around the pin shaft 32.

[0042] Further, to achieve the automatic locking of the locking mechanism 3, the locking mechanism 3 further includes a second elastic body 33. A blind hole is provided on the side of the locking slider 31 facing the dilator tube 11. The second elastic body 33 can be accommodated in the blind hole, and the bottom end can abut against the second table surface 133. When the locking slider 31 is displaced to a position aligned with the locking hole, the locking slider 31 can automatically pop out of the locking hole under the elastic action of the second elastic body 33 to achieve automatic locking.

[0043] Specifically, as Figure 4 shown, the locking slider 31 has an L-shaped structure, including a locking portion 311 and a limiting portion 312. The locking portion 311 can be engaged with the locking hole in a snap-fit manner, and the distal end of the limiting portion 312 is movably connected to the limiting groove.

[0044] Further, after the dilator 1 and the catheter sheath 2 are used, it is necessary to withdraw the dilator 1 from the catheter sheath 2, so that the dilator 1 and the catheter sheath 2 need to be changed from the unlocked state to the completely separated state. To achieve this effect, as Figure 6 shown, the displacement cavity 6 includes an axially connected axial displacement cavity 61, a pin displacement cavity 62, and a mating part screwing-out cavity 63. The pin displacement cavity 62 is provided on both sides of the axial displacement cavity 61. The pin 32 can be displaced in the pin displacement cavity 62 along the axial direction of the catheter sheath 2, which can not only achieve synchronous movement with the dilator 1, but also enable the locking slider 31 to rotate around the pin 32; the mating part screwing-out cavity 63 is provided on the proximal side of the axial displacement cavity 61. The mating part screwing-out cavity 63 and the axial displacement cavity 61 can form an L-shaped track, so that the mating part 13 can be switched from the axial displacement cavity 62 to the mating part screwing-out cavity 63 by rotating the dilator handle 12, and then continue to displace proximally from the mating part screwing-out cavity 63, thereby achieving the complete separation of the dilator 1 and the catheter sheath 2.

[0045] In some preferred embodiments of the present application, due to the setting of the mating part screwing-out cavity 63, the pin displacement cavity 62 cannot be provided at the corresponding position of the mating part screwing-out cavity 63. Therefore, the connection stability of the locking mechanism 3 in the catheter sheath 2 can be ensured by increasing the width of the pin displacement cavity 62.

[0046] It can be imagined that the connection stability of the locking mechanism 3 in the catheter sheath 2 can also be ensured by changing the shapes of the pin 32 and the pin displacement cavity 62. For example, the pin 32 can be set to a barbell-shaped structure, and the disc-shaped structures at both ends can achieve stable connection and cooperation with the matching pin displacement cavity 62.

[0047] Further, to prevent interference between the mating part 13 and the locking slider 31 when the mating part 13 is screwed out, the limiting groove on the transition surface 132 is an L-shaped limiting groove.

[0048] In some preferred embodiments of the present application, such as Figure 2 and Figure 3 shown, to ensure the connection stability between the first elastomer 4 and the dilator 1, a circumferential limiting groove is provided on the side of the dilator handle 12 facing the distal end. A part of the first elastomer 4 can be received in the circumferential limiting groove, and the distal end can abut against the proximal end of the circumferential limiting groove.

[0049] The specific embodiments of the present application have been described in detail above. For those skilled in the art of this technology, without departing from the principle of the present application, several improvements and modifications can still be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A disposable catheter sheath assembly, comprising a catheter sheath and a dilator, wherein the dilator comprises a dilator tube and a dilator handle, wherein the dilator handle is connected to the proximal end of the dilator tube, and the outer diameter of the dilator handle is greater than the outer diameter of the dilator tube, characterized in that: It also includes a locking mechanism and a first elastic body. The proximal end of the outer wall of the catheter sheath is provided with a displacement cavity that cooperates with the locking mechanism. The displacement cavity is provided with a locking hole. The locking mechanism can be axially displaced in the displacement cavity and can be engaged and connected with the locking hole. The first elastic body is sleeved on the outer periphery of the dilator tube and is located between the catheter sheath and the dilator. Its distal end can abut against the proximal end of the catheter sheath, and its proximal end can abut against the distal end of the dilator handle.

2. A disposable catheter sheath assembly according to claim 1, characterized in that: The locking mechanism includes a locking slider and a pin, the locking slider is provided with a through hole matched with the pin, the pin passes through the locking slider along the radial direction of the catheter sheath and is rotationally connected to the displacement cavity.

3. A disposable catheter sheath assembly according to claim 2, characterized in that: The expander further comprises a matching portion, which is connected to the outer wall of the expander tube and can abut against the distal end of the locking slider.

4. A disposable catheter sheath assembly according to claim 3, characterized in that: The matching portion is a ladder-shaped structure, with the ladder surface arranged toward the proximal end, and the locking mechanism is movably connected between the matching portion and the displacement cavity.

5. A disposable catheter sheath assembly according to claim 4, characterized in that: The matching portion includes a first table surface, a transition surface and a second table surface, wherein the first table surface and the second table surface are arranged along the axial direction of the dilator tube and transition through the transition surface; The distance between the first table and the axis of the dilator tube is greater than the distance between the second table and the axis of the dilator tube.

6. A disposable catheter sheath assembly according to claim 5, characterized in that: A limiting groove is provided on one side of the transition surface facing the locking mechanism, and the locking slider rotates around the pin shaft while its distal end moves in the limiting groove.

7. A disposable catheter sheath assembly according to claim 5, characterized in that: The locking mechanism comprises a second elastic body. A blind hole is formed on a side of the locking slider facing the dilator tube. The second elastic body can be accommodated in the blind hole, and a bottom end thereof can abut against the second table surface.

8. A disposable catheter sheath assembly according to claim 3, characterized in that: The locking slider is an L-shaped structure, including a locking portion and a limiting portion. The locking portion can be engaged with the locking hole, and the distal end of the limiting portion is movably connected to the matching portion.

9. A disposable catheter sheath assembly according to claim 2, characterized in that: The displacement cavity comprises a connected axial displacement cavity, a pin displacement cavity and a mating portion rotation-out cavity, the pin displacement cavity is arranged on both sides of the axial displacement cavity, and the pin can be displaced in the pin displacement cavity along the axial direction of the catheter sheath; The mating part screw-out cavity is arranged at the proximal side of the axial displacement cavity, the mating part screw-out cavity and the axial displacement cavity can form an L-shaped track, and the mating part can be rotated from the axial displacement cavity into the mating part screw-out cavity.

10. The disposable catheter sheath assembly according to claim 1, characterized in that: An annular limiting groove is provided on one side of the expander handle facing the distal end, a portion of the first elastic body is accommodated in the annular limiting groove, and the distal end can abut against the proximal end of the annular limiting groove.

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