Self-adapting tissue-organizing sheath tip

Abstract

The application discloses a self-adaptive tissue sheath plastic tip, which comprises a connecting ring fixed at the end of the sheath, a plastic tip assembly is arranged at the end of the connecting ring, the plastic tip assembly comprises a protective sleeve, a circular ring is arranged in the protective sleeve, a fixing ring is fixed at the outer edge of the end of the connecting ring, a first stop ring and a second stop ring are fixed at the inner edge of the fixing ring, a groove is formed between the first stop ring and the second stop ring, a first arc-shaped elastic sheet is fixed at one end of the fixing ring, the free end of the first arc-shaped elastic sheet is arranged in the groove, the circular ring extrudes the first arc-shaped elastic sheet to compress the first arc-shaped elastic sheet until the first arc-shaped elastic sheet is separated from the groove, and the first arc-shaped elastic sheet can be elastically reset by itself to arrange the free end in the groove again when the first arc-shaped elastic sheet is not stressed; a pulling device is fixed at the end of the connecting ring, the first arc-shaped elastic sheet is stressed to be separated from the groove and hits the pulling device, and the circular ring is deformed to the middle and shrinks, so that the problem that the sheath tip cannot automatically adjust the hardness and shape when penetrating through different tissues is solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of sheaths, in particular to a self-adaptive tissue sheath plastic tip. BACKGROUND

[0002] The catheter sheath is a medical device for establishing a percutaneous access in an interventional operation. After inserting a guide wire in the interventional operation, the sheath and the inner core of the sheath need to be inserted into the blood vessel along the guide wire. In this process, the tip of the sheath cannot be smoothly inserted due to the different hardness of the tip of the sheath and the contacted tissue. Forced insertion will cause discomfort symptoms in patients, especially in some slightly curved positions, one-sided single-point plastic tip retention often occurs, which will affect the tip of the sheath, and even the target position cannot be reached. However, due to the flexibility of the guide sheath head, the guide sheath head is easy to abut against the blood vessel wall in the narrow area of the organ tissue, so that the distal end structure of the guide sheath head and the proximal end structure of the guide sheath head will be bent and folded to different degrees. When the whole retention occurs, the guide sheath head will be bent and folded to deform, which causes the development direction of the development ring installed on the proximal end structure of the guide sheath head to be inconsistent with the actual guide direction of the distal end part of the guide sheath head, resulting in that the operation cannot be smoothly carried out. SUMMARY

[0003] The purpose of the present application is to solve the problem that the tip of the sheath cannot automatically adjust the hardness and shape when passing through different tissues, and a self-adaptive tissue sheath plastic tip is proposed.

[0004] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0005] A self-adaptive tissue sheath plastic tip, comprising a connecting ring fixed at the end of the sheath, a plastic tip assembly is arranged at the end of the connecting ring, the plastic tip assembly comprises a protective sleeve, the protective sleeve wraps the end of the connecting ring to form a closed space, and the closed space is filled with liquid; a circular ring is arranged at the end of the protective sleeve away from the connecting ring, the circular ring has elasticity and can be deformed under stress; a fixed ring is fixed at the outer edge of the end of the connecting ring and arranged in the closed space, a first stop ring and a second stop ring are fixed in sequence on the inner edge of the fixed ring in the direction close to the connecting ring, a groove is formed between the first stop ring and the second stop ring, a plurality of first arc-shaped elastic pieces are uniformly fixed on the end of the fixed ring close to the circular ring, the free end of the first arc-shaped elastic piece is arranged in the groove, the circular ring extrudes the first arc-shaped elastic piece to make the first arc-shaped elastic piece compressed, and the first arc-shaped elastic piece is reset by its own elasticity when not stressed to make the free end of the first arc-shaped elastic piece re-arranged in the groove; a pulling device is fixed at the end of the connecting ring, the first arc-shaped elastic piece is separated from the groove under stress and hits the pulling device, and the circular ring is deformed to the middle and shrinks.

[0006] Further description of the above technical scheme is as follows:

[0007] The protective sleeve is a film, one end of which is fixed to the inner edge of the connecting ring, and the other end is fixed to the outer edge of the connecting ring, and the film wraps the end of the connecting ring.

[0008] As a further description of the above technical solution:

[0009] The film is fixedly connected with the connecting ring by heat shrinking.

[0010] As a further description of the above technical solution:

[0011] The circular ring section is circular and closely adheres to the inner edge of the protective sleeve, and the hardness of the circular ring is higher than that of the protective sleeve.

[0012] As a further description of the above technical solution:

[0013] The end face of the second blocking ring away from the first blocking ring is a conical face, and when the free end of the first arc-shaped elastic sheet contacts the conical face, the free end of the first arc-shaped elastic sheet slides over the conical face under the action of its own elastic force and is placed in the groove.

[0014] As a further description of the above technical solution:

[0015] The pulling device comprises second arc-shaped elastic sheets, and the end of the connecting ring is uniformly fixed with a second arc-shaped elastic sheet corresponding to each first arc-shaped elastic sheet, and the free end of the second arc-shaped elastic sheet is connected with the circular ring through a rope.

[0016] As described above, due to the adoption of the above technical solution, the beneficial effects of the present application are:

[0017] (1) The plastic tip assembly of the present application can automatically adjust the hardness and shape according to the characteristics of the contacted tissue, better adapting to the insertion requirements of different tissues;

[0018] (2) The present application sets a deformable circular ring and an arc-shaped elastic sheet, which can smoothly insert by automatic avoidance whether it is a single-point plastic tip retention on one side or overall retention, and even if it encounters hard tissue, it can also insert by peristaltic action; avoiding repeatedly inserting and pulling the tube, thereby shortening the operation time by reducing the exchange of instruments. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present application installed on the sheath;

[0020] Figure 2 It is Figure 1 A-A cross-sectional view thereof;

[0021] Figure 3 It is Figure 2 An enlarged view of B;

[0022] Figure 4 A three-dimensional structural diagram of the fixed ring 5, the first retaining ring 6, and the second retaining ring 7;

[0023] Figure 5 This is a schematic diagram of the three-dimensional structure of ring 4 when it undergoes deformation.

[0024] Legend: 1. Sheath; 2. Connecting ring; 3. Protective sleeve; 4. Ring; 5. Fixing ring; 6. First retaining ring; 7. Second retaining ring; 8. Groove; 9. First arc-shaped spring; 10. Second arc-shaped spring; 11. Rope. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figures 1-5 This invention provides a technical solution for adaptive tissue sheath tip shaping:

[0027] An adaptive tissue sheath tip includes a connecting ring 2 fixed to the end of a sheath 1. The end of the connecting ring 2 is provided with a protective sleeve 3, which is a thin film. One end of the film is fixed to the inner edge of the connecting ring 2, and the other end is fixed to the outer edge of the connecting ring 2. The film wraps around the end of the connecting ring 2 and is fixedly connected to the connecting ring 2 by heat shrinking. The film wraps around the end of the connecting ring 2 to form a sealed space filled with liquid. The protective sleeve 3 can be made of any suitable biocompatible material, such as plastic, and is a thin film structure, therefore it does not provide support. Filling the protective sleeve 3 with physiological saline provides support, similar to a balloon. Gas filling is not used here because gas is easily compressed, while liquid is not, thus maintaining a certain degree of support when compressed.

[0028] A circular ring 4 is provided at the end away from the connecting ring 2 in the sealed space. The cross-section of the circular ring 4 is circular and it is in close contact with the inner edge of the protective sleeve 3. The material of the circular ring 4 is latex, which has a higher hardness than the protective sleeve 3. The circular ring 4 is elastic and can be deformed under force. The circular ring 4 will be displaced when squeezed.

[0029] A fixing ring 5 is fixed to the outer edge of the end of the connecting ring 2 and placed in a sealed space. There is an annular gap between the inner edge of the fixing ring 5 and the inner edge of the protective sleeve 3. A first retaining ring 6 and a second retaining ring 7 are fixed sequentially along the direction close to the connecting ring 2 on the inner edge of the fixing ring 5. An annular groove 8 is formed between the first retaining ring 6 and the second retaining ring 7. Multiple first arc-shaped spring pieces 9 are evenly distributed around the circumference of the end of the fixing ring 5 near the circular ring 4. The free end of the first arc-shaped spring piece 9 is placed in the groove 8. The end face of the second retaining ring 7 away from the first retaining ring 6 is a conical surface. When the first arc-shaped spring piece 9 is compressed to the point that its free end contacts the conical surface, under its own elastic force, the free end of the first arc-shaped spring piece 9 slides over the conical surface and is placed back in the groove 8.

[0030] The pulling device includes a second arc-shaped spring piece 10. The connecting ring 2 has two second arc-shaped spring pieces 10 that are evenly distributed around its end, each corresponding to a first arc-shaped spring piece 9. The free end of the second arc-shaped spring piece 10 is a smooth arc shape to avoid damage to the protective sleeve 3 when it comes into contact with it. The free ends of the second arc-shaped spring pieces 10 are all connected to the ring 4 via ropes 11. When the second arc-shaped spring piece 10 is subjected to force, the free end of the second arc-shaped spring piece 10 is displaced and pulls the ring 4 via the ropes 11, causing the ring 4 to deform and contract.

[0031] The fixing ring 5 is made of a hard plastic commonly used in medical devices, such as polyvinyl chloride. When the protective sleeve 3 is filled with saline, there is a certain longitudinal space between the ring 4 and the fixing ring 5, which allows the ring 4 to be compressed and deformed. At the same time, this longitudinal space limits the amount of deformation of the ring 4 to prevent excessive deformation. The first arc-shaped spring 9 and the second arc-shaped spring 10 are made of stainless steel, which has a certain hardness and can ensure good elasticity and rebound effect.

[0032] Working principle: The puncture needle is inserted into the blood vessel, the inner core of the puncture needle is removed, leaving the puncture needle cannula inside the blood vessel. A guidewire is inserted, and a channel is established after entering the blood vessel. The puncture needle cannula is then removed, and sheath 1 and its inner core are inserted into the blood vessel along the guidewire. The inner core of sheath 1 and the guidewire are then removed, leaving only sheath 1. The interventional procedure is performed within sheath 1. During the insertion of sheath 1 and its inner core into the blood vessel along the guidewire, the tip assembly of sheath 1 needs to sequentially contact the dermis, fat layer, muscle layer, and blood vessel wall.

[0033] When the protective sleeve 3 contacts a relatively smooth tissue, it maintains a certain degree of support due to the liquid filling it. The ring 4 undergoes a slight displacement and does not contact the first arc-shaped spring piece 9 until it passes through the tissue. When encountering a softer tissue, a single point of the plastic tip becomes stuck on one side. The support of the protective sleeve 3 is insufficient, and the contact end deforms. One point on the ring 4 is compressed and deforms. The contact position automatically avoids the stuck position through deformation. After passing through, it automatically resets through elasticity and continues to move forward. When encountering a softer tissue, the entire plastic tip becomes stuck. The ring 4 is compressed as a whole and contacts and is compressed with multiple first arc-shaped spring pieces 9. The first arc-shaped spring pieces 9 are compressed and store force. The free end of the first arc-shaped spring piece 9 does not disengage from the groove 8. The support force at the plastic tip contact end gradually increases until it passes through the tissue. When encountering harder tissue, the ring 4 becomes stuck in the plastic tip, and the entire ring 4 is compressed and comes into contact with and is compressed by multiple first arc-shaped spring pieces 9. The first arc-shaped spring pieces 9 are compressed and accumulate force until the free end of the first arc-shaped spring piece 9 leaves the groove 8. Since the first arc-shaped spring piece 9 was compressed and accumulated force before, it will exert force when the free end of the first arc-shaped spring piece 9 leaves the groove 8, striking the second arc-shaped spring piece 10. The free end of the second arc-shaped spring piece 10 is displaced and pulls the ring 4 through the rope 11, causing the ring 4 to deform and contract, avoiding the harder tissue. After the ring 4 passes the obstacle, it recovers its shape under its own elasticity. The middle part of the protective sleeve 3 has not passed through the harder tissue. The process of the ring 4 recovering its shape will create a pull on the protective sleeve 3, forming a peristaltic movement, and successfully passing through the harder tissue. After the free end of the first arc-shaped spring piece 9 disengages from the groove 8, it contacts the conical surface. Under its own elastic force, the free end of the first arc-shaped spring piece 9 slides across the conical surface and repositions itself within the groove 8, thus achieving automatic reset. During the reset process of the first arc-shaped spring piece 9, the second arc-shaped spring piece 10 resets under its own elastic force and also exerts a certain pushing effect on the first arc-shaped spring piece 9.

[0034] Therefore, the tip assembly can automatically adjust its hardness and shape according to the characteristics of the tissue it contacts, and inserts with a peristaltic motion to better adapt to the insertion needs of different tissues.

[0035] It is worth noting that, in Figure 3 The indicator shows two positions: M indicates the interval between the ring 4 and the first arc-shaped spring 9, which is also the displacement space of the ring 4 before it comes into contact with the first arc-shaped spring 9; N indicates the interval between the first arc-shaped spring 9 and the second arc-shaped spring 10, which is also the space where the first arc-shaped spring 9 undergoes displacement and deformation before it comes into contact with the second arc-shaped spring 10. Setting these two intervals ensures that there is space for displacement and deformation but is not too large, so that the device can operate reasonably and improves the sensitivity and accuracy of surgical operations.

[0036] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention within the scope of the technology disclosed in the present invention, and all such substitutions or changes should be covered within the scope of protection of the present invention.

Claims

1. A sheath tip that adapts to different tissue structures, characterized in that, The plastic tip assembly is located at the end of the connecting ring (2) fixed at the end of the sheath (1), including a protective sleeve (3). The protective sleeve (3) wraps the end of the connecting ring (2) to form a sealed space, which is filled with liquid. A circular ring (4) is provided at the end of the protective sleeve (3) away from the connecting ring (2). The circular ring (4) is elastic and can deform under force. A fixing ring (5) is fixed on the outer edge of the end of the connecting ring (2) and placed in the sealed space. A first retaining ring (6) and a second retaining ring (7) are fixed sequentially on the inner edge of the fixing ring (5) in the direction close to the connecting ring (2). A groove (8) is formed between the first retaining ring (6) and the second retaining ring (7). Multiple first arc-shaped spring pieces (9) are evenly distributed around the circumference of the fixing ring (5) near the circular ring (4). The free end of 9) is placed in the groove (8), and the ring (4) squeezes the first arc-shaped spring (9) to compress the first arc-shaped spring (9) until the first arc-shaped spring (9) is separated from the groove (8). When the first arc-shaped spring (9) is not under force, it can be reset by its own elasticity so that its free end is placed back in the groove (8). The end of the connecting ring (2) is fixed with a pulling device. The first arc-shaped spring (9) is under force and is separated from the groove (8) and hits the pulling device, pulling the ring (4) to deform and shrink towards the middle. The pulling device includes a second arc-shaped spring (10). The end of the connecting ring (2) is evenly distributed with second arc-shaped springs (10) that correspond one-to-one with each first arc-shaped spring (9). The free ends of the second arc-shaped springs (10) are all connected to the ring (4) by rope (11).

2. The adaptive tissue sheath tip according to claim 1, characterized in that, The protective sleeve (3) is a thin film. One end of the film is fixed to the inner edge of the connecting ring (2), and the other end is fixed to the outer edge of the connecting ring (2). The film wraps the end of the connecting ring (2).

3. The adaptive tissue sheath tip according to claim 2, characterized in that, The film is fixedly connected to the connecting ring (2) by heat shrinking.

4. The adaptive tissue sheath tip according to claim 1, characterized in that, The ring (4) has a circular cross-section and is in close contact with the inner edge of the protective sleeve (3). The hardness of the ring (4) is higher than that of the protective sleeve (3).

5. The adaptive tissue sheath tip according to claim 1, characterized in that, The end face of the second retaining ring (7) away from the first retaining ring (6) is a conical surface. When the free end of the first arc-shaped spring piece (9) contacts the conical surface, the free end of the first arc-shaped spring piece (9) slides over the conical surface and is placed in the groove (8) under its own elastic force.

6. The adaptive tissue sheath tip according to claim 1, characterized in that, The free end of the second arc-shaped spring (10) is a smooth arc shape to avoid damage to the protective sleeve (3) when it comes into contact with the protective sleeve (3).

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