Bent sheathing canal and conveyor

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to a bent sheathing canal and a conveyor. The bent sheathing canal comprises a first developing ring and a conveying sheathing canal provided with a bent part; the conveying sheath tube comprises an inner-layer catheter and an outer-layer catheter connected to the inner-layer catheter in a sleeving mode. The first developing ring is sleeved on the inner-layer catheter positioned at the bending part, and one side, deviating from the inner-layer catheter, of the first developing ring is propped against the inner wall of the outer-layer catheter; the outer catheter covers the notch groove, and due to the design of the notch groove, when the conveying sheath tube is bent at the first developing ring, the internal stress borne by the first developing ring during bending is small, and the stress of the first developing ring at the bending part can be conducted through the outer catheter; accordingly, the first developing ring is not prone to wrinkling when bent, correspondingly, the conveying sheath tube is not prone to wrinkling at the bent portion, and the safety of the bent sheath tube implanted into the human body is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, and in particular relates to a curved sheath and delivery device. Background Technology

[0002] In minimally invasive surgery, delivery sheaths are used to establish a delivery channel from outside the body to inside the body (mainly to the lesion site). Implantable instruments can be delivered to the lesion site or retrieved through this channel. This channel can also be used to administer medications to the patient or to drain bodily fluids from the patient's body.

[0003] To ensure the correct implantation of the left atrial appendage occluder into the target site in the left atrium of the human heart, a delivery sheath is typically advanced to the left atrial appendage. The implantation path is as follows: the sheath enters through the femoral vein, then passes through the inferior vena cava to the right atrium, then through a pre-drilled puncture site into the left atrium, and finally reaches the left atrial appendage. This establishes the delivery pathway for the left atrial appendage occluder. To ensure accurate detection of the sheath's implantation, multiple contrast rings are marked at the end of the sheath. One contrast ring marks the location of the sheath in the left atrium, and another marks the location of the left atrial appendage.

[0004] In the prior art, when the delivery sheath is bent at the position of the imaging ring, the delivery sheath at the imaging ring position is prone to wrinkling. The wrinkled delivery sheath poses a risk of scratching blood vessels and heart tissue. Utility Model Content

[0005] This invention addresses the technical problem of wrinkles easily forming in the delivery sheath at the developing ring position in existing technologies by providing a curved sheath and delivery device.

[0006] In view of the above technical problems, this utility model provides a curved sheath, including a first imaging ring and a delivery sheath with a curved portion; the delivery sheath includes an inner conduit and an outer conduit sleeved on the inner conduit; the first imaging ring is sleeved on the inner conduit located at the curved portion, and one end of the first imaging ring away from the inner conduit abuts against the inner wall of the outer conduit;

[0007] The first developing ring has a notch, and the outer conduit is covered in the notch, so that the stress of the first developing ring at the bend can be transmitted through the outer conduit.

[0008] Optionally, the curved portion has an inner corner portion, and the notch groove is distributed on the sidewall of the first developing ring at the inner corner portion.

[0009] Optionally, the width of the first developing ring at the inner corner of the bend is smaller than the width at the outer corner of the bend.

[0010] Optionally, the notch includes an annular groove disposed on the first developing ring, the annular groove extending spirally along the circumference of the delivery sheath on the first developing ring.

[0011] Optionally, the notch includes a first groove group and a second groove group limited at opposite ends of the first developing ring, the first groove group including a plurality of first grooves arranged in annular intervals, and the second groove group including a plurality of second grooves arranged in annular intervals.

[0012] Optionally, the inner conduit includes a first conduit and a second conduit, the first conduit being sleeved on the second conduit, the outer conduit being sleeved on the first conduit, and the outer conduit and the first conduit being made of the same material; the first imaging ring is sleeved on the first conduit located at the bend.

[0013] Optionally, the delivery sheath includes a proximal sheath, a first curved section, an intermediate section, a second curved section, and a distal sheath connected in sequence; the curved portion is disposed on the second curved section.

[0014] Optionally, the curved sheath further includes a second imaging ring, which is sleeved on the inner conduit of the distal sheath, and the side of the second imaging ring facing away from the inner conduit abuts against the inner wall of the outer conduit.

[0015] This utility model embodiment also provides a conveyor, including a connector, an end cap, and a curved sheath as described above; the connector is provided with an internal space and a first opening and a second opening communicating with opposite ends of the internal space;

[0016] The delivery sheath is inserted into the first opening, and the inner bore of the inner conduit communicates with the internal space;

[0017] The end cap is detachably mounted on the connector and is used to seal the second opening.

[0018] Optionally, the conveyor further includes a branch pipe and a three-way valve communicating with the branch pipe; the connector is also provided with a third opening communicating with the internal space, and the end of the branch pipe away from the three-way valve is connected to the third opening.

[0019] In this embodiment, the first imaging ring is sleeved on the inner conduit located at the bend, and the side of the first imaging ring facing away from the inner conduit abuts against the inner wall of the outer conduit. The first imaging ring has a notch groove, which is opposite to the bend. The outer conduit is covered in the notch groove. The design of the notch groove makes the internal stress on the first imaging ring smaller when the delivery sheath bends at the first imaging ring, and allows the stress of the first imaging ring at the bend to be conducted through the outer conduit. Therefore, the first imaging ring is less likely to wrinkle when bending, and correspondingly, the delivery sheath is less likely to wrinkle at the bend, ensuring the safety of the bent sheath implanted in the human body. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a partial schematic diagram of a curved sheath provided in one embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the first imaging ring of a curved sheath provided in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the first imaging ring of a curved sheath provided in an embodiment of the present invention;

[0024] Figure 4 A partial cross-sectional view of a curved sheath provided in an embodiment of this utility model;

[0025] Figure 5 This is a schematic diagram of a conveyor provided in one embodiment of the present invention.

[0026] The reference numerals in the accompanying drawings are as follows:

[0027] 1. First imaging ring; 11. Notched groove; 111. Annular groove; 112. First groove; 113. Second groove; 2. Delivery sheath; 21. Outer conduit; 22. Inner conduit; 221. First conduit; 222. Second conduit; 23. Proximal sheath; 24. First bend; 25. Middle section; 26. Second bend; 27. Distal sheath; 28. Bend; 3. Second imaging ring; 4. Connector; 5. End cap; 6. Branch tube; 7. Three-way valve. Detailed Implementation

[0028] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0029] It should be understood that the terms "upper", "lower", "left", "right", "front", "rear", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of this utility model.

[0030] like Figures 1 to 3 As shown, an embodiment of the present invention provides a curved sheath, including a first imaging ring 1 and a delivery sheath 2 with a curved portion 28; the delivery sheath 2 includes an inner conduit 22 and an outer conduit 21 sleeved on the inner conduit 22; the first imaging ring 1 is sleeved on the inner conduit 22 located at the curved portion 28, and the side of the first imaging ring 1 facing away from the inner conduit 22 abuts against the inner wall of the outer conduit 21; it can be understood that the first imaging ring 1 is located between the inner conduit 22 and the outer conduit 21, and the curved portion 28 is provided at the distal end of the delivery sheath 2.

[0031] Understandably, the curved portion 28 has a large curvature. If an existing developing ring is used, bending it can easily cause wrinkling, and it can also easily compress the sheath, causing wrinkling of the sheath. The first developing ring 1 of this invention has a notch 11, which is provided corresponding to the curved portion 28, and the notch 11 is covered by an outer conduit 21. The notch 11 can be a groove located at the end of the first developing ring 1, or an annular groove 111 located on the arcuate side of the first developing ring 1, etc.

[0032] The steps for manufacturing the curved sheath are as follows: First, the first imaging ring 1 is fitted onto the straight inner conduit 22, and the outer conduit 21 is fitted onto the inner conduit 22; then, the part of the delivery sheath 2 that needs to be bent is installed in the molding mold; finally, the double-bent sheath is placed in hot water for heating, and after the molding mold cools down, the delivery sheath 2 is removed, thereby forming the curved part 28 on the molding mold.

[0033] In this embodiment, the first imaging ring 1 is sleeved on the inner conduit 22 located at the bend 28, and the side of the first imaging ring 1 facing away from the inner conduit 22 abuts against the inner wall of the outer conduit 21; the first imaging ring 1 is provided with a notch 11 opposite to the bend 28, and the outer conduit 21 is covered in the notch 11; the design of the notch 11 makes the internal stress on the first imaging ring 1 smaller when the delivery sheath 2 bends at the first imaging ring 1, and allows the stress of the first imaging ring 1 at the bend 28 to be conducted through the outer conduit 21, so that the first imaging ring 1 is less likely to wrinkle when bending, and correspondingly, the delivery sheath 2 is less likely to wrinkle at the bend 28, ensuring the safety of the bent sheath implanted in the human body.

[0034] In one embodiment, such as Figure 2 As shown, the notch 11 includes multiple annular grooves 111 disposed on the first developing ring 1. Understandably, the annular grooves 111 can be spiral grooves on the inner or outer sidewall of the first developing ring 1, or spiral grooves penetrating both the inner and outer sidewalls. Specifically, during the bending process of the delivery sheath 2, the spiral grooves significantly weaken the strength of the developing ring itself, causing the two ends of the first developing ring 1 to converge towards the center. The hollow design of the annular grooves 111 allows for heat fusion to penetrate the Pebax tubing. Since the Pebax tubing is an elastic material, the overall force transmission is relatively smooth. Compared to existing developing rings with higher structural strength, this design reduces stress shielding on the developing ring, preventing stress concentration on the first developing ring 1 during bending and reducing internal stress. Consequently, wrinkles are less likely to occur when the first developing ring 1 is bent.

[0035] In one embodiment, such as Figure 3 As shown, the notch 11 includes a first groove group and a second groove group that are limited at opposite ends of the first developing ring 1. The first groove group includes a plurality of first grooves 112 arranged in a ring at intervals, and the second groove group includes a plurality of second grooves 113 arranged in a ring at intervals. Understandably, both ends of the first developing ring 1 are serrated. The first grooves 112 and the second grooves 113 are respectively opened at the two ends of the first developing ring 1 in the axial direction. This structure weakens the axial strength of the first developing ring 1. The first protrusion between two adjacent first grooves 112 and the second protrusion between two adjacent second grooves 113 increase the contact area between the first developing ring 1 and the inner conduit 22. The larger the contact area, the smaller the internal stress when the first developing ring 1 bends, and thus the less likely the first developing ring 1 will wrinkle when it bends.

[0036] In one embodiment, such as Figure 1As shown, the curved portion 28 has an inner corner, and notches 11 are distributed on the sidewall of the first developing ring 1 at the inner corner. The width of the first developing ring 1 at the inner corner of the curved portion 28 is smaller than the width at the outer corner. Understandably, the curvature at the inner corner of the curved portion 28 is greater than the curvature at the outer corner, making the first developing ring 1 more prone to wrinkling at the inner corner of the curved portion 28. In this embodiment, the first developing ring 1 has a wedge-shaped structure, and the width of the first developing ring 1 at the inner corner of the curved portion 28 is smaller. By opening notches 11, the width of the first developing ring 1 on the inner side of the curve is reduced, thereby reducing the stress blockage caused by the excessive width of the developing ring and avoiding the area of ​​highest stress concentration. This reduces the internal stress generated when the first developing ring 1 bends. Furthermore, this position is covered by a relatively soft outer conduit 21, allowing the stress generated by the developing ring during bending to be transmitted more smoothly through the outer conduit 21, making it less likely for the first developing ring 1 and the surrounding sheath to wrinkle when bending.

[0037] In one embodiment, such as Figure 4 As shown, the curved sheath includes an inner conduit 22, an outer conduit 21, and a metal braided tube 29 sandwiched between the inner and outer conduits 22 and 21. A sheath region with a radiopaque ring is located at the distal end of the curved sheath. The radiopaque ring is fitted onto the inner conduit 22 and located at one end of the metal braided tube. The inner conduit 22 includes a first conduit 221 and a second conduit 222. The first conduit 221 is fitted onto the second conduit 222. In the region with the radiopaque ring, the outer conduit 21 is fitted onto the second conduit 222, and the outer conduit 21 and the second conduit 222 are made of the same material. The first radiopaque ring 1 is fitted onto the first conduit 221 located at the bend 28. In one specific embodiment, the outer conduit 21 and the first conduit 221 are both made of PEBAX (block polyetheramide resin), and the second conduit 222 is made of PTFE (polytetrafluoroethylene). In this embodiment, during the heat melting process of the delivery sheath 2, the outer conduit 21 and the first conduit 221 are made of the same material. The first imaging ring 1 is disposed between the outer conduit 21 and the first conduit 221, which are made of the same material. Thus, the bending force can be smoothly transferred between the outer conduit 21 and the first conduit 221, and stress concentration is less likely to occur on the first imaging ring 1. Consequently, wrinkles are less likely to occur when the first imaging ring 1 is bent.

[0038] In one embodiment, such as Figure 5 As shown, the delivery sheath 2 includes a proximal sheath 23, a first curved section 24, an intermediate section 25, a second curved section 26, and a distal sheath 27 connected in sequence; the curved portion 28 is disposed on the second curved section 26.

[0039] The procedure for implanting the delivery sheath 2 into the patient's left atrial appendage is as follows: the distal sheath 27 of the delivery sheath 2 enters the femoral vein, then passes through the inferior vena cava to the right atrium, then through a pre-drilled puncture hole into the left atrium, and finally reaches the left atrial appendage. At this point, the delivery pathway for the left atrial appendage occluder is established. When the delivery sheath 2 is implanted into the patient, the first curved section 24 facilitates the entry of the distal sheath 27 into the left atrium, and the second curved section 26 facilitates the arrival of the distal sheath 27 into the left atrial appendage. In this embodiment, the design of the delivery sheath 2 facilitates the implantation of the distal sheath 27 into the patient's left atrial appendage.

[0040] In one embodiment, such as Figure 5 As shown, the curved sheath also includes a second contrast-enhancing ring 3, which is sleeved on the inner conduit 22 of the distal sheath 27, with the end of the second contrast-enhancing ring 3 facing away from the inner conduit 22 abutting against the inner wall of the outer conduit 21. Understandably, the first contrast-enhancing ring 1 can mark whether the second curved segment 26 reaches the left atrial appendage, and the second contrast-enhancing ring 3 can mark the specific location of the distal sheath 27 reaching the left atrial appendage, ensuring the accuracy of the delivery sheath 2's implantation into the patient.

[0041] like Figure 5 As shown, another embodiment of the present invention also provides a conveyor, including a connector 4, an end cap 5, and the aforementioned curved sheath; the connector 4 is provided with an internal space and a first opening and a second opening connecting opposite ends of the internal space;

[0042] The delivery sheath 2 is inserted into the first opening, and the inner bore of the inner conduit 22 communicates with the internal space; the end cap 5 is detachably mounted on the connector 4 and is used to seal the second opening. Understandably, the end cap 5 can be threaded onto the connector 4.

[0043] Specifically, the delivery sheath 2 is implanted into the patient's body, and the connector 4 is located outside the patient's body. After opening the end cap 5 from the connector 4, the occluder is delivered sequentially through the internal space and the inner hole of the inner catheter 22 into the patient's left atrial appendage.

[0044] In one embodiment, such as Figure 5 As shown, the delivery device also includes a branch pipe 6 and a three-way valve 7 connecting the branch pipe 6; the connector 4 is also provided with a third opening connecting to the internal space, and the end of the branch pipe 6 away from the three-way valve 7 is connected to the third opening. Understandably, the two opposite ends of the branch pipe 6 are connected to the three-way valve 7 and the connector 4 respectively, and medical personnel can deliver medication into the patient's body through the three-way valve 7.

[0045] The above are merely embodiments of the curved sheath and conveyor of this utility model, and are not intended to limit this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A curved sheath, characterized in that, It includes a first imaging ring and a delivery sheath with a bend; the delivery sheath includes an inner conduit and an outer conduit sleeved on the inner conduit; the first imaging ring is sleeved on the inner conduit located at the bend, and the end of the first imaging ring facing away from the inner conduit abuts against the inner wall of the outer conduit. The first developing ring has a notch, and the outer conduit is covered in the notch, so that the stress of the first developing ring at the bend can be transmitted through the outer conduit.

2. The curved sheath according to claim 1, characterized in that, The curved portion has an inner corner, and the notch groove is distributed on the sidewall of the first developing ring at the inner corner.

3. The curved sheath according to claim 1, characterized in that, The width of the first developing ring at the inner corner of the bend is smaller than the width at the outer corner of the bend.

4. The curved sheath according to claim 1, characterized in that, The notch includes an annular groove disposed on the first developing ring, the annular groove extending spirally along the circumference of the delivery sheath on the first developing ring.

5. The curved sheath according to claim 1, characterized in that, The notch includes a first groove group and a second groove group that are limited at opposite ends of the first developing ring. The first groove group includes a plurality of first grooves arranged in a ring at intervals, and the second groove group includes a plurality of second grooves arranged in a ring at intervals.

6. The curved sheath according to claim 1, characterized in that, The inner conduit includes a first conduit and a second conduit, the first conduit being sleeved on the second conduit, and the outer conduit being sleeved on the first conduit, wherein the outer conduit and the first conduit are made of the same material; the first imaging ring is sleeved on the first conduit located at the bend.

7. The curved sheath according to claim 1, characterized in that, The delivery sheath includes a proximal sheath, a first curved section, an intermediate section, a second curved section, and a distal sheath connected in sequence; the curved section is disposed on the second curved section.

8. The curved sheath according to claim 7, characterized in that, The curved sheath further includes a second imaging ring, which is sleeved on the inner conduit of the distal sheath, and the side of the second imaging ring facing away from the inner conduit abuts against the inner wall of the outer conduit.

9. A conveyor, characterized in that, It includes a connector, an end cap, and a curved sheath as described in any one of claims 1 to 8; the connector is provided with an internal space and a first opening and a second opening communicating with opposite ends of the internal space; The delivery sheath is inserted into the first opening, and the inner bore of the inner conduit communicates with the internal space; The end cap is detachably mounted on the connector and is used to seal the second opening.

10. The conveyor according to claim 9, characterized in that, The conveyor also includes a branch pipe and a three-way valve connecting the branch pipe; the connector is also provided with a third opening connecting the internal space, and the end of the branch pipe away from the three-way valve is connected to the third opening.

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