Catheter sheath assembly

Abstract

The utility model relates to the technical field of medical instruments, in particular to a catheter sheath assembly. The catheter sheath assembly comprises a catheter sheath, a dilator and a displacement locking mechanism, the displacement locking mechanism comprises a rotating shaft, an elastic body and a main body part, a first through hole is formed in the main body part, and the rotating shaft can be contained in the first through hole and is movably connected with a dilator base through the first through hole; a first blind hole is formed in the main body part, the elastic body can be contained in the first blind hole, one end of the elastic body in the axial direction abuts against the closed end of the first blind hole, the other end of the elastic body can stretch out of the first blind hole to abut against the inner wall of the dilator base, and the main body part is movably connected with the dilator base through a rotating shaft and connected with the catheter sheath base in a clamped mode. The main body part can be automatically locked with the catheter sheath base under the action of the elastic body, and the catheter sheath base has the advantages of being flexible and stable in locking and easy to operate.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a catheter sheath assembly. Background Art

[0002] During vascular interventional treatment, relevant medical devices are introduced into the human vascular system. Among them, the catheter insertion sheath, referred to as the catheter sheath, also known as the vascular sheath, is a professional interventional medical device that establishes an access channel from the skin to the vascular cavity to facilitate repeated delivery or exchange of instruments into the blood vessels, and protects the punctured blood vessels during the repeated entry and exit of the instruments. The operation of establishing an access channel from the skin to the vascular cavity through the catheter sheath is as follows: first, use a puncture needle to make a small opening in the artery or vein, then introduce the guide wire into the artery or vein through the inner cavity of the puncture needle, and remove the puncture needle. Pass the dilator tube through the catheter sheath seat into the sheath tube, and then lock the dilator with the catheter sheath and guide them into the artery or vein together through the guide wire. After the sheath tube is fixed in position, withdraw the dilator, and finally the catheter sheath forms a channel for entering, exiting or replacing various interventional equipment.

[0003] In the prior art, the dilator and the catheter sheath are locked and unlocked by spirally connecting the dilator seat and the catheter sheath seat. Although this connection method has the advantage of simple connection, it makes it difficult for the dilator seat and the catheter sheath seat to be stably locked unless the spiral reaches the thread. In addition, the operator needs to keep rotating the spiral, which also causes cumbersome operation.

[0004] Therefore, there is an urgent need for a catheter sheath assembly that can be flexibly locked, stably locked, and easily operated. Utility Model Content

[0005] The purpose of the present application is to provide a catheter sheath assembly that can be flexibly locked, stably locked, and easily operated.

[0006] The embodiments of the present application can be implemented through the following technical solutions:

[0007] A catheter sheath assembly comprises a catheter sheath and a dilator, wherein the catheter sheath comprises a catheter sheath seat and a sheath tube connected to the catheter sheath seat, the dilator comprises a dilator seat and a dilator tube connected to the dilator seat, the dilator detachably penetrates the catheter sheath, and the dilator tube passes through the catheter sheath seat and is inserted into the sheath tube.

[0008] It also includes a displacement locking mechanism, wherein the displacement locking mechanism is located between the dilator seat and the catheter sheath seat;

[0009] The displacement locking mechanism includes a rotating shaft, an elastic body and a main body. The main body is provided with a first through hole, and the rotating shaft can be accommodated in the first through hole and movably connected to the dilator seat through the first through hole; the main body is provided with a first blind hole, and the elastomer can be accommodated in the first blind hole. One end of the elastomer along the axial direction thereof abuts against the closed end of the first blind hole, and the other end can extend out of the first blind hole and abut against the inner wall of the dilator seat. The main body is movably connected to the dilator seat through the rotating shaft and is engaged with the catheter sheath seat.

[0010] Furthermore, the expander seat is provided with a second through hole matched with the rotating shaft, and the second through hole and the first through hole can be coaxially arranged to form a space for the rotating shaft to rotate.

[0011] Furthermore, the catheter sheath seat includes a first matching portion, the first matching portion is arranged toward the dilator seat, the first matching portion is arranged away from the opening end of the first blind hole, the first matching portion is arranged along the axial direction of the sheath tube, and the main body can form a locking state with the first matching portion during the displacement process.

[0012] Furthermore, the first matching portion is a plate-shaped structure, and a zigzag track matching with the main body is provided on the end surface thereof facing the main body.

[0013] Furthermore, the slope of the zigzag track is arranged toward the expander seat.

[0014] Preferably, one end of the dilator tube away from the dilator seat is a cone-like structure.

[0015] Preferably, the inner diameter and the outer diameter of the cone-like structure gradually decrease from the dilator seat toward the dilator tube.

[0016] Preferably, the inner diameter of the end of the sheath tube away from the catheter sheath seat matches the outer diameter of the dilator tube.

[0017] The catheter sheath assembly provided by the embodiment of the present application has at least the following beneficial effects:

[0018] (1) The displacement locking mechanism in the present application realizes the connection between the catheter sheath seat and the dilator seat through a rotating shaft, an elastomer and a main body, so that when the main body is displaced along the axial direction of the sheath, the main body can rotate around the rotating shaft, and at the same time, the elastomer can squeeze the main body under its own elastic action to realize the movement and recovery of the main body along the axial direction of the elastomer, so as to realize flexible locking and stable locking.

[0019] (2) The catheter sheath seat in the present application is provided with a first matching portion, and a serrated track matching with the main body is provided on the end face of the first matching portion. While the main body rotates around the rotation axis, it can be displaced along the axial direction of the sheath tube on the serrated track. At the same time, the elastomer can squeeze the main body under the elastic action and lock it in different positions of the serrated track to achieve graded locking of the catheter sheath seat and the dilator seat.

[0020] (3) The dilator seat in the present application is provided with a recessed portion so that the first matching portion can be accommodated in the recessed portion. One side of the recessed portion can limit the circumferential rotation of the first matching portion. The displacement locking mechanism can be disengaged from the serrated track of the first matching portion by rotating the dilator seat in a direction away from the recessed portion, thereby achieving the release of the locking state between the catheter sheath seat and the dilator seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the overall structural diagram of the catheter sheath assembly in this application;

[0022] Figure 2 An exploded view of the catheter sheath assembly in the present application;

[0023] Figure 3 An exploded view of the connection between the dilator seat, the displacement locking mechanism and the catheter sheath seat in the present application;

[0024] Figure 4 This is the overall structural diagram of the catheter sheath seat in this application;

[0025] Figure 5 It is the overall structural diagram of the expander seat in this application;

[0026] Figure 6 This is the overall structural diagram of the expander seat in this application from another angle;

[0027] Figure 7 This is the overall structural diagram of the main body of this application;

[0028] Figure 8 This is an overall structural diagram of the main body of this application from another angle.

[0029] Figure numerals: 1. catheter sheath seat, 11. first matching part, 12. first connecting part, 13. second matching part, 14. first hand-held part, 2. dilator seat, 21. second through hole, 22. second connecting part, 23. third matching part, 24. third through hole, 25. second hand-held part, 3. displacement locking mechanism, 31. rotating shaft, 32. elastomer, 33. main body, 331. first through hole, 332. first blind hole, 4. sheath tube, 5. dilator tube. DETAILED DESCRIPTION

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

[0031] The vocabulary in this specification is used to illustrate the embodiments of the present application, but is not intended to limit the present application. Unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an indirect connection through an intermediate medium, or a communication between the two components. For those skilled in the art, the specific meanings of the above terms in this application can be specifically understood.

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

[0033] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present application are further explained below in conjunction with the accompanying drawings and through specific implementation methods. For the convenience of description, the following description uses the terms "proximal end" and "distal end", where "proximal end" refers to the end close to the operator and "distal end" refers to the end far away from the operator and deep into the blood vessel.

[0034] The present application provides a catheter sheath assembly for establishing a percutaneous channel to a blood vessel lumen, thereby facilitating repeated delivery or exchange of instruments into a blood vessel.

[0035] Specifically, the catheter sheath assembly includes a catheter sheath and a dilator. The dilator can be detachably inserted through the catheter sheath and can enter the artery or vein together with the catheter sheath. After the position of the catheter sheath is fixed, the dilator can be withdrawn in the proximal direction. Finally, the catheter sheath forms a channel for entering, exiting or replacing various interventional devices.

[0036] Figure 1 and Figure 2 The overall structure diagram and the exploded diagram of a catheter sheath assembly in the present application are shown respectively. Figure 1 and Figure 2 As shown, the catheter sheath includes a catheter sheath seat 1 and a sheath tube 4 connected to the catheter sheath seat 1, the dilator includes a dilator seat 2 and a dilator tube 5 connected to the dilator seat 2, the dilator tube 5 passes through the catheter sheath seat 1 and enters the sheath tube 4, that is, the catheter sheath can be sleeved on the outside of the dilator, and the dilator tube 5 and the sheath tube 4 can move relative to each other.

[0037] Furthermore, if Figure 2 and Figure 3As shown, the catheter sheath assembly further includes a displacement locking mechanism 3 , which is located between the catheter sheath seat 1 and the dilator seat 2 . The catheter sheath seat 1 and the dilator seat 2 are locked and unlocked relative to each other through the displacement locking mechanism 3 .

[0038] Specifically, if Figure 3 , Figure 7 and Figure 8 As shown, the displacement locking mechanism 3 includes a rotating shaft 31, an elastic body 32 and a main body 33. The main body 33 is provided with a first through hole 331, and the rotating shaft 31 is accommodated in the first through hole 331 and is movably connected with the first through hole 331; the main body 33 is provided with a first blind hole 332, and the elastic body 32 can be accommodated in the first blind hole 332, and one end of the elastic body 32 along its axial direction abuts against the closed end of the first blind hole 332, and the other end can extend out of the first blind hole 332 and abut against the inner wall of the dilator seat 2, and the main body 33 can rotate around the rotating shaft 31 while realizing the engagement connection with the catheter sheath seat 1, so as to realize the automatic locking of the catheter sheath seat 1 and the dilator seat 2. When the main body 33 is displaced along the axial direction of the sheath tube 4, the main body 33 can rotate around the rotating shaft 31, and the elastic body 32 can squeeze the main body 33 under its own elastic action, so as to realize the movement and restoration of the main body 33 along the axial direction of the elastic body 32.

[0039] Furthermore, if Figure 5 As shown, the expander seat 2 is provided with a second through hole 21 cooperating with the rotating shaft 31. The second through hole 21 and the first through hole 331 can be coaxially arranged to form a space for the rotating shaft 31 to rotate. On the one hand, the initial fixation of the position of the displacement locking mechanism 3 is achieved. On the other hand, the main body 33 can rotate relative to the expander seat 2.

[0040] Furthermore, the catheter sheath seat 1 includes a first matching portion 11, the first matching portion 11 is arranged toward the dilator seat 2, the first matching portion 11 is arranged away from the opening end of the first blind hole 332, and the first matching portion 11 is arranged along the axial direction of the sheath tube 4. The main body portion 33 can cooperate with the first matching portion 11 to form a locking state during the displacement process to achieve locking of the relative positions of the dilator tube 5 and the sheath tube 4.

[0041] Furthermore, if Figure 3 and Figure 4 As shown, the first matching portion 11 is a plate-type structure, and its end face facing the main body 33 is provided with a zigzag track matching with the main body 33. While the main body 33 rotates around the rotating axis 31, it can move along the axial direction of the sheath tube 4 on the zigzag track. At the same time, the elastomer 32 can squeeze the main body 33 under its own elastic action and lock it in different positions of the zigzag track to achieve graded locking of the catheter sheath seat 1 and the dilator seat 2.

[0042] Furthermore, the slope of the zigzag track is arranged toward the dilator seat 2 , so that when the dilator seat 2 moves in a direction close to the catheter sheath seat 1 , the catheter sheath seat 1 and the dilator seat 2 can be automatically locked.

[0043] In some specific embodiments of the present application, Figure 4 As shown, the catheter sheath seat 1 also includes a first connecting portion 12, which is a tubular structure. The sheath tube 4 can be sleeved in the first connecting portion 12 and connected to the first connecting portion 12 to achieve a stable connection between the catheter sheath seat 1 and the sheath tube 4.

[0044] In some specific embodiments of the present application, the first connection portion 12 can be connected to the sheath tube 4 by bonding, welding, fixed connection, integral molding, etc. It is conceivable that no matter what connection method is used, as long as a stable connection between the sheath tube 4 and the first connection portion 12 can be achieved.

[0045] Furthermore, if Figure 4 As shown, the catheter sheath seat 1 also includes a second matching portion 13, which is connected to the outer periphery of the first connecting portion 12, and the first matching portion 11 is connected to the side of the second matching portion 13 facing the dilator seat 2 to provide activity space and avoidance space for the displacement locking mechanism 3.

[0046] In some preferred embodiments of the present application, in order to facilitate the operation of the operator, the catheter sheath seat 1 further includes a first gripping portion 14 , which is a plate-shaped protrusion connected to the outer periphery of the first connecting portion 12 and the second matching portion 13 .

[0047] In some specific embodiments of the present application, Figure 4 As shown, the expander seat 2 includes a second connecting portion 22, which is a tubular structure. The expander tube 5 can be sleeved in the second connecting portion 22 and connected to the second connecting portion 22 to achieve a stable connection between the expander seat 2 and the expander tube 5.

[0048] In some specific embodiments of the present application, the second connection portion 22 can be connected to the dilator tube 5 by bonding, welding, fixed connection, integral molding, etc. It is conceivable that no matter what connection method is used, as long as a stable connection between the dilator tube 5 and the second connection portion 22 can be achieved.

[0049] Furthermore, if Figure 5As shown, the expander seat 2 also includes a third matching portion 23, which is connected to the outer periphery of the second connecting portion 22. The third matching portion 23 is provided with a second through hole 21 and a third through hole 24. The rotating shaft 31 can pass through the second through hole 21 and be movably connected to the second through hole 21. The main body 33 can extend out of the third through hole 24 and form a locked state with the zigzag track of the first matching portion 11, so as to provide a movable space and an avoidance space for the displacement locking mechanism 3.

[0050] In some preferred embodiments of the present application, in order to facilitate the operation of the operator, the expander seat 2 further includes a second handle portion 25 , which is a plate-shaped protrusion connected to the outer periphery of the second connecting portion 22 and the third matching portion 23 .

[0051] In some preferred embodiments of the present application, Figure 6 As shown, the dilator seat 2 further includes a recessed portion 26, which is located at the outer periphery of the third matching portion 23, and the first matching portion 11 can be accommodated in the recessed portion 26, and one side of the recessed portion 26 can limit the circumferential rotation of the first matching portion 11. On the one hand, the circumferential rotation of the catheter sheath seat 1 and the dilator seat 2 can be limited; on the other hand, the displacement locking mechanism 3 can be disengaged from the zigzag track of the first matching portion 11 by rotating the dilator seat 2 in a direction away from the recessed portion 26, thereby achieving unlocking of the catheter sheath seat 1 and the dilator seat 2.

[0052] In some preferred embodiments of the present application, the end of the dilator tube 5 away from the dilator seat 2 is a cone-like structure, and the inner diameter and outer diameter of the cone-like structure gradually decrease from the dilator seat 2 to the dilator tube 5 to achieve a good vascular dilation effect.

[0053] In some preferred embodiments of the present application, the inner diameter of the end of the sheath 4 away from the catheter sheath seat 1 matches the outer diameter of the dilator tube 5, so that the sheath 4 and the dilator tube 5 fit tightly, effectively avoiding the occurrence of dissection when puncturing the blood vessel, which causes harm and pain to the patient.

[0054] The above is a detailed introduction to the specific implementation methods of the present application. For those skilled in the art, several improvements and modifications may be made to the present application without departing from the principles of the present application. These improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A catheter sheath assembly, comprising a catheter sheath and a dilator, wherein the catheter sheath comprises a catheter sheath seat and a sheath tube connected to the catheter sheath seat, the dilator comprises a dilator seat and a dilator tube connected to the dilator seat, the dilator detachably penetrates the catheter sheath, and the dilator tube passes through the catheter sheath seat and is inserted into the sheath tube, characterized in that: It also includes a displacement locking mechanism, which is located between the dilator seat and the catheter sheath seat; The displacement locking mechanism includes a rotating shaft, an elastic body and a main body. The main body is provided with a first through hole, and the rotating shaft can be accommodated in the first through hole and movably connected to the dilator seat through the first through hole; the main body is provided with a first blind hole, and the elastomer can be accommodated in the first blind hole. One end of the elastomer along the axial direction thereof abuts against the closed end of the first blind hole, and the other end can extend out of the first blind hole and abut against the inner wall of the dilator seat. The main body is movably connected to the dilator seat through the rotating shaft and is engaged with the catheter sheath seat.

2. A catheter sheath assembly according to claim 1, characterized in that: The expander seat is provided with a second through hole matched with the rotating shaft, and the second through hole and the first through hole can be coaxially arranged to form a space for the rotating shaft to rotate.

3. A catheter sheath assembly according to claim 1, characterized in that: The catheter sheath seat includes a first matching portion, the first matching portion is arranged toward the dilator seat, the first matching portion is arranged away from the opening end of the first blind hole, the first matching portion is arranged along the axial direction of the sheath tube, and the main body can form a locking state with the first matching portion during displacement.

4. A catheter sheath assembly according to claim 3, characterized in that: The first matching portion is a plate-shaped structure, and a sawtooth track matching with the main body is arranged on the end surface thereof facing the main body.

5. A catheter sheath assembly according to claim 4, characterized in that: The slope of the zigzag track is arranged toward the expander seat.

6. A catheter sheath assembly according to claim 1, characterized in that: One end of the dilator tube away from the dilator seat is a cone-like structure.

7. A catheter sheath assembly according to claim 6, characterized in that: The inner diameter and the outer diameter of the cone-like structure gradually decrease from the dilator seat to the dilator tube.

8. A catheter sheath assembly according to claim 1, characterized in that: The inner diameter of the end of the sheath tube away from the catheter sheath seat matches the outer diameter of the dilator tube.

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