Tearable sheathing canal with anti-reflux assembly

Abstract

The utility model discloses a tearable sheathing canal with an anti-reflux component, which relates to the field of medical instruments, and comprises a tearable sheathing canal and a tearable sheath seat arranged at the near end of the sheathing canal, a sealing rubber mat is arranged in the sheath seat, an expandable or contractible annular balloon is arranged on the peripheral surface of the inner cavity of the sheath seat, and the annular balloon is provided with an anti-reflux component in the expansion state. The annular balloon which can be inflated and deflated is arranged in the inner cavity of the sheath base, when the catheter is inserted into the sheath base, the gap between the sheath base and the catheter can be filled, the sheath base and the catheter form a sealed state, and the phenomenon that blood flows back when the catheter is inserted into and withdrawn from the sheath tube is effectively avoided; in addition, by additionally arranging a fixing structure between the sheath base and the balloon cavity, the balloon body can be tightly attached to the inner wall of the sheath base when the balloon is in a shrunken state, and the balloon does not affect insertion and retreating of the catheter into and out of the tearable sheath tube.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, in particular to a tearable sheath tube with an anti-backflow component. Background Art

[0002] The sheath is a device used to guide intravascular devices percutaneously into the vascular access. The specific steps for inserting the sheath into the blood vessel are: after the puncture needle enters the blood vessel subcutaneously, the guide wire is sent into the blood vessel from the tail of the puncture needle. After the guide wire enters the blood vessel to a certain length, the puncture needle is pulled out, and the dilator and sheath are inserted through the tail of the guide wire. Under the guidance of the guide wire, the dilator and sheath enter the predetermined position of the blood vessel, and the guide wire and dilator are withdrawn. At this time, various diagnostic and therapeutic catheters can be sent in and replaced through the sheath left in the blood vessel. When performing more complex interventional treatments, the sheath needs to be withdrawn from the human body after use. Since the tail of the sheath is usually blocked by an instrument, the sheath with the catheter inserted inside cannot be directly removed from the body. At this time, the sheath needs to be torn from the outside, and it needs to be torn while withdrawing until it is completely removed. This type of sheath is called a tearable sheath.

[0003] The catheter is inserted into the sheath through the incision on the sealing pad, and the incision is required to tightly wrap the outer circumference of the catheter to prevent blood from flowing back and leaking out. This is an ideal state. During the actual instrument intervention and removal process, blood will flow out along the tearable sheath cavity and the structural gap. Utility Model Content

[0004] The utility model aims to provide a tearable sheath tube with an anti-backflow component, which solves the problems raised in the above-mentioned background technology by arranging an inflatable annular balloon in the inner cavity of the sheath tube.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A tearable sheath with an anti-backflow component comprises a tearable sheath and a tearable sheath seat arranged at the proximal end of the sheath, a sealing rubber pad is arranged inside the sheath seat, and an expandable or shrinkable annular balloon is arranged on the inner surface of the inner cavity of the sheath seat, and the annular balloon is wrapped around the outer surface of the catheter to form a sealing match with the catheter in the expanded state, and the annular balloon is wrapped around the outer surface of the catheter to form a sealing match with the catheter in the expanded state. When the annular balloon is in a non-inflated contracted state, the volume is small and does not hinder the insertion of the catheter into the tearable sheath. When the annular balloon is in an inflated expanded state, it can form a sealing match with the inserted catheter.

[0007] As a further solution of the utility model: the annular balloon includes a tearable tube segment, which divides the balloon body of the annular balloon into two / more connected balloon cavities, and the radial cross-section of the tearable tube segment is smaller than the radial cross-section of other tube segments of the balloon. The annular balloon is divided into multiple balloon cavities by the tearable tube segment, which not only does not affect the inflation connection between the various balloon cavities, but also makes it easy for the operator to synchronously tear and destroy the balloon and the tearable sheath from the tearable tube segment, thereby facilitating the withdrawal of the tearable sheath.

[0008] As a further solution of the utility model: the sheath seat is fixedly connected to a handle, and a through hole connected to the inner cavity of the sheath seat is formed on the handle. The handle is used for the operator to control the tearable sheath. An extension tube can be arranged in the through hole, and drugs required for treatment can be injected into the tearable sheath through the extension tube.

[0009] As a further solution of the utility model: the annular balloon is fixedly connected to a trachea, which constitutes an inflation / deflation channel of the balloon. The trachea passes through a through hole to connect the balloon with an external inflation and deflation device. The trachea is arranged in the through hole in the handle. Without changing the overall structure of the tearable sheath, inflation or deflation of the annular balloon can be achieved.

[0010] As a further solution of the utility model: the outer circumference of the balloon is fixedly connected to the inner circumference of the sheath seat to fix the position of the balloon and prevent the position of the balloon from changing when the catheter is inserted into the tearable sheath.

[0011] As a further solution of the utility model: an electromagnet is fixedly connected to the inner circumference of the sheath, and magnetic chips are fixedly connected to the inner surface of the balloon. Under the action of the electromagnet and the magnetic chips, the deflated balloon body can be tightly adsorbed on the inner circumference of the sheath seat, thereby reducing the obstacle to the insertion of the catheter into the tearable sheath.

[0012] As a further solution of the utility model: the power line of the electromagnet passes through the through hole on the sheath seat handle and is connected to the external power supply. On the basis of not changing the original structure of the tearable sheath tube, the power of the electromagnet is turned on and off, thereby controlling the volume of the balloon after deflation.

[0013] As a further solution of the utility model: a magnet is fixedly connected to the inner circumference of the sheath seat, and a plurality of magnetic strips corresponding to the positions of the magnets are fixedly connected to the inner surface of the balloon. Under the action of the magnets and the magnetic strips, the deflated balloon body can be tightly adsorbed on the inner circumference of the sheath seat, thereby reducing the obstacle to the insertion of the catheter into the tearable sheath.

[0014] As a further solution of the utility model: the plurality of magnetic strips are evenly distributed along the inner circumference of the balloon. The evenly distributed magnets can not only make the balloon body fit evenly on the inner circumference of the sheath seat, but also, when the balloon is inflated, the balloon can evenly wrap the catheter, thereby improving the sealing between the two.

[0015] As a further solution of the utility model: elastic ropes are evenly provided on the inner circumference of the balloon, one end of the elastic rope is fixed to the inner surface of the balloon close to the sheath seat, and the other end is fixed to the inner surface of the balloon away from the sheath seat. Under the action of the elastic rope, the deflated balloon can be attached to the inner circumference of the sheath seat, thereby reducing the obstacle to the insertion of the catheter into the tearable sheath. When the balloon is inflated, the tension generated by the inflation on the surface of the balloon overcomes the elastic force of the elastic rope, so that the balloon can expand smoothly and wrap the catheter, forming a sealed state to prevent blood backflow.

[0016] Compared with the prior art, the utility model has the following beneficial effects: the utility model has a novel structure, and by arranging an inflatable and deflable annular balloon in the inner cavity of the sheath seat, the gap between the sheath seat and the catheter can be filled when the catheter is inserted into the sheath seat, and the two form a sealed state, which effectively avoids the phenomenon of blood backflow when the catheter is inserted into and withdrawn from the sheath; in addition, by adding a fixed structure between the sheath seat and the balloon cavity, the balloon body can be tightly attached to the inner wall of the sheath seat in a deflated state, so that the balloon does not affect the insertion of the catheter and the withdrawal of the tearable sheath. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the tearable sheath;

[0018] Figure 2 It is a schematic diagram of the X-axis cross-sectional structure of the sheath seat in the tearable sheath tube;

[0019] Figure 3 This is a schematic diagram of the internal three-dimensional structure of the tearable sheath in the uninflated state;

[0020] Figure 4 This is a schematic diagram of the internal three-dimensional structure of the tearable sheath in the inflated state;

[0021] Figure 5 It is a schematic diagram of the three-dimensional structure of the balloon in the inflated state;

[0022] Figure 6 This is a diagram showing the coordination between the balloon and the catheter in the tearable sheath embodiment 1 when the balloon is not inflated;

[0023] Figure 7 This is a diagram showing the coordination between the balloon and the catheter in the tearable sheath embodiment 1 when the balloon is inflated;

[0024] Figure 8 This is a diagram showing the coordination between the balloon and the catheter in the tearable sheath embodiment 2 when the balloon is not inflated;

[0025] Fig. 9 This is a diagram showing the coordination between the balloon and the catheter in the tearable sheath embodiment 2 when the balloon is inflated;

[0026] Fig.10 This is a diagram showing the coordination between the balloon and the catheter in the tearable sheath embodiment 3 when the balloon is not inflated;

[0027] Fig.11 This is a diagram showing the coordination between the balloon and the catheter in Example 3 of the tearable sheath when the balloon is inflated.

[0028] In the figure: 11-sheath seat, 12-base, 13-tearable groove, 14-sealing pad, 15-step surface, 16-positioning column, 21-handle, 22-through hole, 30-sheath tube, 41-balloon, 411-magnetic chips, 412-electromagnet, 413-electric wire, 414-magnetic strip, 415-magnet, 416-elastic rope, 42-trachea, 43-tearable tube section. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] The “distal end” mentioned in the present application refers to the end far away from the operator, and the “proximal end” mentioned in the present application refers to the end close to the operator.

[0031] like Figure 1 As shown, in an embodiment of the utility model, a tearable sheath with an anti-backflow component includes a tearable sheath and a tearable sheath seat 11 arranged at the proximal end of the sheath, a sealing rubber pad 14 is arranged inside the sheath seat 11, the sheath and the sheath seat 11 constitute a tearable sheath, and the catheter is inserted into the tearable sheath, passing through the sheath seat 11 and the sheath in sequence until it is inserted into the accurate position in the patient's body.

[0032] The inner cavity surface of the sheath seat 11 is provided with an inflatable or deflated annular balloon 41. When inflated, the annular balloon 41 is wrapped around the outer surface of the catheter to form a seal with the catheter. When in deflated, a passage is left in the middle for the catheter to enter and exit. In the non-inflated deflated state, the annular balloon 41 is relatively small in size and does not affect the insertion of the catheter into the tearable sheath. In the inflated expanded state, the annular balloon 41 can wrap the catheter inserted into the sheath to form a seal between the catheter and the sheath seat 11, effectively preventing the blood in the patient's body from flowing back to the outside of the body along the tearable sheath after the catheter is inserted into the tearable sheath.

[0033] like Figure 5As shown, the annular balloon 41 includes a surface balloon body and a balloon cavity of variable volume formed by the balloon body, and the annular balloon 41 includes a tearable tube segment 43. The tearable tube segment 43 separates the balloon body of the annular balloon 41 into two / more balloon cavities. The radial cross-section of the tearable tube segment 43 is smaller than the radial cross-section of other tube segments of the balloon 41. The tearable tube segment 43 is strength-differentiated from the annular balloon 41 by adopting a size-limiting manner, so that the tearable tube segment 43 can be easily destroyed and torn by the operator while being able to guide air.

[0034] The sheath base 11 includes a straight tube section connected to the sheath tube and a base 12 located at the end of the straight tube section. A sealing rubber pad 14 is arranged in the inner cavity of the base 12. A tearable groove 13 is arranged on the side of the base 12. The tearable groove 13 extends from the free end of the base 12 to the free end of the straight tube section. In actual application, the sheath tube can be torn from the outside, from the patient's incision, and the sheath tube can be withdrawn while being torn until the sheath tube is withdrawn from the patient's body.

[0035] A step surface 15 is provided in the inner cavity of the base 12, and a plurality of positioning columns 16 are fixedly connected to one end of the step surface 15 close to the sealing gasket 14. The positioning columns 16 match the positioning holes on the sealing gasket 14. With the cooperation of the positioning columns 16 and the positioning holes, the position of the sealing gasket 14 can be fixed. In the process of the catheter passing through the sealing gasket 14, the position displacement of the sealing gasket 14 can be effectively avoided, thereby further increasing the overall sealing performance of the sheath.

[0036] The outer circumference of the balloon 41 is fixedly connected to the inner circumference of the sheath seat 11, which can ensure that the balloon 41 will not be displaced during the process of the catheter being inserted into the tearable sheath, thereby ensuring the safety of the medical device.

[0037] The sheath seat 11 is fixedly connected with a handle 21, and a through hole 22 is formed on the handle 21, which is connected to the inner cavity of the sheath seat 11. An extension tube can be inserted into the through hole 22, and the required medicine can be injected into the sheath tube under the action of the extension tube. The trachea 42 of the balloon 41 preferably passes through the through hole 22, connecting the balloon 41 with the external inflation and deflation device. This setting method does not require changing the structure of the sheath seat 11 itself and does not affect its use function. Under the action of the inflation and deflation device, the balloon 41 can be inflated or deflated according to the use needs to change the volume of the balloon 41.

[0038] The annular balloon 41 is fixedly connected with a trachea 42, which constitutes an inflation / deflation channel of the balloon 41. The trachea 42 passes through the through hole 22 to connect the balloon 41 with an external inflation and deflation device. The trachea 42 is arranged in the through hole 22 of the handle 21, and can be connected to an external inflation and deflation device without affecting the overall structure of the tearable sheath tube, so as to realize inflation and deflation of the balloon 41 in the sheath seat 11, thereby changing the overall volume of the balloon 41. Example 1

[0039] like Figure 6 and Figure 7 As shown, the inner circumference of the sheath seat 11 is fixedly connected with an electromagnet 412, and the inner surface of the balloon 41 is fixedly connected with magnetic chips 411. The fixing method of the inner circumference of the sheath seat 11 and the electromagnet 412 can be but not limited to embedded fixing, plastic sealing fixing, embedded and plastic sealing fixing, adhesive fixing, etc.; the inner surface of the balloon 41 is fixedly connected with magnetic chips 411, and the distribution thickness of the magnetic chips 411 on the inner surface of the balloon 41 is less than 1mm. When the electromagnet 412 is not powered, the balloon 41 can shrink or expand, and the size of the balloon 41 is adjusted by changing the air intake of the balloon 41, thereby adjusting the sealing state between the catheter and the sheath seat 11; when the electromagnet 412 is powered, after the balloon 41 is deflated and contracted, the magnetic chips 411 inside it are attracted by the electromagnet 412, and the magnetic chips 411 drive the balloon 41 body to fit tightly on the inner wall of the sheath seat 11, reducing the volume of the balloon 41 after deflation and contraction, thereby reducing the influence of the balloon 41 on the insertion of the catheter into the tearable sheath.

[0040] The power line 413 of the electromagnet 412 passes through the through hole 22 and is connected to the external power source. This arrangement can not only realize power supply to the electromagnet 412 to control the magnetic force of the electromagnet 412, but also will not damage the original structure of the tearable sheath.

[0041] During actual use, the balloon 41 is in a non-inflated deflated state, the electromagnet 412 is energized, the magnetic chips 411 on the inner surface of the balloon 41 are attracted to the electromagnet 412, the balloon 41 is tightly attached to the inner circumference of the sheath seat 11, and the catheter is inserted into the tearable sheath from the incision of the sealing pad 14. After the catheter passes through the balloon 41, the electromagnet 412 is de-energized and the balloon 41 is inflated, forming a seal between the catheter and the sheath seat 11. The blood in the sheath cannot flow out from the structural gap between the catheter and the sheath seat 11 through the balloon 41, effectively avoiding the phenomenon of blood backflow from the inner cavity of the tearable sheath during catheter intervention. Example 2

[0042] like Figure 3 and Figure 4As shown, the inner circumference of the sheath seat 11 is fixedly connected with a magnet, and the inner surface of the balloon 41 is fixedly connected with a plurality of magnetic strips 414 corresponding to the position of the magnet, and the plurality of magnetic strips 414 are evenly distributed along the inner circumference of the balloon 41. When the balloon 41 is inflated, the balloon 41 can evenly wrap the catheter, thereby improving the sealing between the two. The fixing method of the magnet can be, but is not limited to, embedded fixing, plastic sealing fixing, embedded and plastic sealing fixing, adhesive fixing, etc.; the magnet and the magnetic strip 414 are close to each other. The magnetic properties of the side of the balloon 41 that is opposite to each other, so that when the balloon 41 is not inflated, under the mutual attraction between the magnet and the magnetic strip 414 on the inner surface of the balloon 41, the balloon 41 can be driven to cling to the inner circumference of the sheath seat 11, reducing the volume of the balloon 41 in the uninflated state, and facilitating the insertion of the catheter into the tearable sheath; when the balloon 41 is inflated, the tension on the surface of the balloon body due to inflation overcomes the attraction between the magnet and the magnetic strip 414, so that the balloon 41 can smoothly expand and wrap the catheter, forming a sealed state, and preventing blood from flowing back.

[0043] like Figure 8 and Fig. 9 In actual use, the balloon 41 is in a non-inflated deflated state, the magnetic strip 414 on the inner surface of the balloon 41 is attracted to the magnet, the balloon 41 is tightly attached to the inner circumference of the sheath seat 11, and the catheter is inserted into the tearable sheath from the incision of the sealing pad 14. After the catheter passes through the balloon 41, the balloon 41 is inflated to form a seal between the catheter and the sheath seat 11. The blood in the sheath cannot flow out from the structural gap between the catheter and the sheath seat 11 through the balloon 41, effectively avoiding the phenomenon of blood backflow in the tearable sheath. Example 3

[0044] like Fig.10 and Fig.11 As shown, the outer circumference of the balloon 41 is fixedly connected to the inner circumference of the sheath seat 11, and the fixed connection method can be but is not limited to bonding. The inner circumference of the balloon 41 is evenly provided with elastic ropes 416, and one end of the elastic rope 416 is fixed to the inner surface of the balloon 41 near the sheath seat 11. When the balloon 41 is in a non-inflated state, the surface of the balloon 41 is pulled by the elastic rope 416, so that the deflated balloon 41 can be close to the inner wall of the sheath seat 11 in the non-inflated state of the balloon 41, without affecting the insertion of the catheter into the tearable sheath; when the balloon 41 is inflated, the tension generated by the inflation of the balloon surface overcomes the elastic force of the elastic rope 416, so that the balloon 41 can smoothly expand and wrap the catheter, forming a sealed state to prevent blood from flowing back.

[0045] During actual use, the balloon 41 is in a non-inflated deflated state, and the elastic rope 416 arranged in the balloon 41 can pull the balloon body to further reduce its volume in the deflated state. The catheter is inserted into the tearable sheath from the incision of the sealing pad 14, and after passing through the balloon 41, the balloon 41 is inflated to form a seal between the catheter and the sheath seat 11. The blood in the sheath cannot flow out from the structural gap between the catheter and the sheath seat 11 through the balloon 41, thereby effectively avoiding the phenomenon of blood backflow in the tearable sheath.

[0046] like Figure 3 and Figure 4 As shown, in actual application, the sheath is first inserted into the body through the patient's incision, and then the catheter is inserted from the sheath seat 11. At this time, the balloon 41 is inflated and expands to fill the gap between the sheath seat 11 and the catheter, so that the inner cavity of the sheath seat 11 is sealed. The blood in the sheath cannot flow out from the structural gap between the sealing pad 14 and the sheath seat 11 through the balloon 41, effectively avoiding the phenomenon of blood backflow in the sheath.

[0047] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0048] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A tearable sheath tube with an anti-backflow component, comprising a tearable sheath tube (30) and a tearable sheath seat (11) disposed at the proximal end of the sheath tube (30), wherein a sealing rubber pad (14) is disposed inside the sheath seat (11), characterized in that: An expandable or contractible annular balloon (41) is provided on the inner cavity surface of the sheath seat (11). When the annular balloon (41) is in an expanded state, it wraps around the outer circumference of the catheter to form a sealing fit with the catheter. When the annular balloon (41) is in a contracted state, a passage is left in the middle for the catheter to enter and exit.

2. A tearable sheath tube with an anti-backflow component according to claim 1, characterized in that: The annular balloon (41) comprises a tearable tube segment (43), which divides the body of the annular balloon (41) into two / more connected cavities, and the radial cross-section of the tearable tube segment (43) is smaller than the radial cross-sections of other tube segments of the balloon (41).

3. The tearable sheath tube with an anti-backflow component according to claim 1, characterized in that: The sheath seat (11) is fixedly connected to a handle (21), and the handle (21) is formed with a through hole (22) that is in communication with the inner cavity of the sheath seat (11).

4. A tearable sheath tube with an anti-backflow component according to claim 3, characterized in that: The annular balloon (41) is fixedly connected to a trachea, which constitutes an inflation / deflation passage of the balloon. The trachea passes through the through hole (22) to connect the balloon (41) with an external inflation / deflation device.

5. The tearable sheath tube with an anti-backflow component according to claim 1, characterized in that: The outer circumferential surface of the balloon (41) is fixedly connected to the inner circumferential surface of the sheath seat (11).

6. A tearable sheath tube with an anti-backflow component according to claim 5, characterized in that: The inner circumferential surface of the sheath seat (11) is fixedly connected with an electromagnet (412), and the inner surface of the balloon (41) is fixedly connected with magnetic chips (411).

7. The tearable sheath tube with an anti-backflow component according to claim 6, characterized in that: The electric wire (413) of the electromagnet (412) passes through the through hole (22) on the sheath seat handle (21) and is connected to an external power source.

8. The tearable sheath tube with an anti-backflow component according to claim 5, characterized in that: The inner circumferential surface of the sheath seat (11) is fixedly connected to a magnet (415), and the inner surface of the balloon (41) is fixedly connected to a plurality of magnetic strips (414) corresponding to the positions of the magnet (415).

9. The tearable sheath tube with an anti-backflow component according to claim 8, characterized in that: The plurality of magnetic strips (414) are evenly distributed along the inner circumference of the balloon (41).

10. The tearable sheath tube with an anti-backflow component according to claim 5, characterized in that: The inner circumferential surface of the balloon (41) is evenly provided with elastic ropes (416), one end of the elastic rope (416) is fixed to the inner surface of the balloon (41) close to the sheath seat (11), and the other end is fixed to the inner surface of the balloon (41) away from the sheath seat (11).

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