Single-use interventional accessory

Abstract

The application discloses a disposable intervention accessory and relates to the field of medical devices. The intervention accessory comprises a sheath seat, a catheter is arranged at the front end of the sheath seat, an intervention channel is arranged in the sheath seat, a disinfecting and cleaning mechanism is arranged in the middle section of the sheath seat, a stabilizing assembly is arranged at the input end of the sheath seat, the disinfecting and cleaning mechanism comprises a first ratchet wheel which is sleeved on the periphery of the intervention channel, installation grooves are formed in the two sides of the interior of the first ratchet wheel, a limiting column is fixedly connected to the bottom end in the installation groove, an elastic sleeve is sleeved on the periphery of the limiting column, a first disinfecting cotton sheet is arranged on the inner side of the scraper, and a pushing assembly is arranged at the front end of the first ratchet wheel in the interior of the sheath seat. The application solves the problems that the disinfecting and cleaning of the inner wall of the catheter sheath is inconvenient due to the small size of the catheter sheath, and the diameter of various tubular instruments is different, and the blood vessels of a patient are easily damaged when the instrument passes through the catheter sheath and enters the blood vessels.

Description

Technical Field

[0001] This invention relates to the field of medical devices, specifically to disposable interventional accessories. Background Technology

[0002] Interventional accessories refer to a class of auxiliary tools used in interventional procedures (such as cardiovascular intervention, neurointervention, peripheral vascular intervention, etc.) to assist catheters, guidewires, sheaths and other main instruments in completing the procedure. They are usually used to establish access, optimize the operation, improve safety or achieve specific functions. Among them, the catheter sheath is a tubular instrument used in interventional procedures to establish and maintain vascular or tissue access, allowing catheters, balloons, stents and other instruments to enter and exit smoothly, while reducing damage to the blood vessel wall. It is the "gateway" of interventional procedures and directly affects the safety and ease of operation of the procedure.

[0003] However, existing catheter sheaths require the insertion and removal of devices such as catheters, balloons, and stents during use. When these devices are inserted or removed, bacteria may adhere to the inner wall of the catheter sheath. Repeated use may increase the risk of wound infection for patients. On the one hand, due to the small size of the catheter sheath, it is inconvenient to disinfect and clean the inner wall of the catheter sheath. On the other hand, because the diameters of the various tubular devices that enter the catheter sheath are different, it is not easy to keep them stable after they enter the blood vessel through the catheter sheath, which can easily cause damage to the patient's blood vessels.

[0004] To address the aforementioned issues, there is an urgent need for innovative designs based on existing single-use interventional accessories. Summary of the Invention

[0005] The purpose of this invention is to provide disposable interventional accessories to address the problems mentioned in the background art, such as the small size of the catheter sheath, the inconvenience of disinfecting and cleaning the inner wall of the catheter sheath, and the fact that various tubular instruments have different diameters, which can easily damage the patient's blood vessels when the instruments enter the blood vessels through the catheter sheath. The technical solution of this invention addresses the problem that the existing technical solutions are too simplistic and provides a solution that is significantly different from the existing technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a disposable interventional accessory, including a sheath seat, a catheter installed at the front end of the sheath seat, an interventional channel provided inside the sheath seat, the catheter communicating with the interventional channel, the front end of the sheath seat being a conical structure, a disinfection and cleaning mechanism installed inside the middle section of the sheath seat, and a stabilizing component installed at the input end of the sheath seat.

[0007] The disinfection and cleaning mechanism includes a first ratchet fitted around the periphery of the intervention channel. The first ratchet has mounting grooves on both sides inside. A limiting post is fixedly connected to the bottom of the mounting groove. A telescopic sleeve is fitted around the limiting post. The telescopic sleeve is connected to the top of the limiting post via a first spring. One end of the telescopic sleeve, away from the limiting post, extends into the intervention channel and is fixedly connected to a scraper. A first disinfectant cotton pad is provided inside the scraper. A receiving groove is provided on the inner wall of the intervention channel corresponding to the scraper. A moving groove is provided on the inner wall of the intervention channel corresponding to the telescopic sleeve. A contact rod is fixedly connected to the rear end of the telescopic sleeve within the mounting groove. A pushing component is installed at the front end of the first ratchet inside the sheath seat.

[0008] Preferably, the pushing assembly includes a second ratchet, which is rotatably connected to the inner wall of the cavity inside the sheath seat via a bearing. A first abutment block is fixedly connected to the surface of the second ratchet facing the first ratchet. A third ratchet is fixedly connected to the periphery of the intervention channel inside the second ratchet. A limiting block is installed between the first and second ratchets. The limiting block is fixedly connected to the inner wall of the cavity inside the sheath seat. A pushing rod is installed inside the limiting block corresponding to the first abutment block. The pushing rod slides within a groove inside the limiting block. A second abutment block is fixedly connected to one end of the pushing rod facing the first ratchet. A second spring is sleeved around the pushing rod.

[0009] Preferably, the stabilizing component includes a movable sleeve that is slidably connected to the inner wall of the intervention channel. Fixed blocks are installed on both sides inside the movable sleeve, and the fixed blocks are limited to slide within the sliding grooves on both sides inside the movable sleeve. A third spring is installed at the bottom of the fixed blocks, and the end of the third spring away from the fixed blocks is connected to the inner wall of the sliding groove. A second disinfectant cotton pad is installed on the periphery of the movable sleeve, and the second disinfectant cotton pad is in contact with the inner wall of the intervention channel.

[0010] Preferably, an operating rod is installed on one side of the outer periphery of the sheath seat. The operating rod slides within a limiting groove on one side of the outer periphery of the sheath seat. One end of the operating rod extends into the internal cavity of the sheath seat and is fixedly connected to a crossbar. Pads are fixedly connected to both ends of the crossbar corresponding to the tooth surfaces of the first ratchet and the second ratchet.

[0011] Preferably, the teeth of the first ratchet and the second ratchet are opposite in direction, the teeth of the second ratchet and the third ratchet are opposite in direction, a limit rod is rotatably provided on the inner wall of the second ratchet, and a torsion spring is provided between the limit rod and the second ratchet.

[0012] Preferably, the first abutment block is configured as an inclined surface structure with the inclined surface facing the first ratchet, and the second abutment block is configured as an inclined surface structure with the inclined surface facing the intervention channel.

[0013] Preferably, two sets of fixing blocks are symmetrically arranged, and the ends of the two sets of fixing blocks near the entrance of the intervention channel are set as inclined structures, with their inclined surfaces facing each other.

[0014] Preferably, a limiting roller is rotatably connected at the entrance of the intervention channel, and a hemostatic valve is installed at the exit of the intervention channel.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This invention comprises a first ratchet, a limiting post, a telescopic sleeve, a first spring, a scraper, a contact rod, a pushing assembly, an operating rod, a crossbar, and a pawl. Pushing the operating rod drives the crossbar and pawl, which in turn pushes the pushing assembly, causing the telescopic sleeve to extend into the interventional channel. This causes the scraper to extend out of the receiving groove. Subsequently, pushing the operating rod in the opposite direction, in conjunction with the pawl, rotates the first ratchet. The rotation of the first ratchet causes the scraper to rotate inwards into the interventional channel. The disinfectant cotton pad inside the scraper disinfects and cleans the inner wall of the interventional channel, effectively removing bacteria adhering to the inner wall of the catheter sheath. This reduces the risk of wound infection for patients and solves the problem of inconvenient disinfection and cleaning of the inner wall of the catheter sheath due to its small size.

[0017] This invention comprises a movable sleeve, a fixing block, a third spring, and a sterile cotton pad. During intervention with tubing devices, the fixed block, with its beveled end near the interventional channel entrance, facilitates insertion of the device into the movable sleeve. Inside the movable sleeve, the fixing block, under the action of the third spring, consistently adheres to and holds tubing devices of varying diameters. As the device is inserted, the movable sleeve moves to the hemostatic valve, preventing movement after entry into the blood vessel and improving stability. Simultaneously, the sterile cotton pad around the movable sleeve provides initial sterilization to the outer side of the scraper and the inner wall of the interventional channel. When the device is removed, the movable sleeve slides out, further cleaning the outer side of the scraper and the inner wall of the interventional channel. This invention solves the problems of inconvenience in maintaining stability after entering the blood vessel from the catheter sheath due to the different diameters of various tubular devices, which could easily cause damage to the patient's blood vessels, and the difficulty in cleaning the outer side of the scraper. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic cross-sectional view of the internal structure of the present invention;

[0020] Figure 3 This is a partially enlarged cross-sectional view of the internal structure of the present invention;

[0021] Figure 4 This is a top view of the first ratchet structure of the present invention;

[0022] Figure 5 This is a top view of the second ratchet structure of the present invention;

[0023] Figure 6 This is a schematic diagram of the telescopic sleeve structure of the present invention;

[0024] Figure 7 This is a schematic diagram of the internal structure of the movable sleeve of the present invention;

[0025] Figure 8 This is a schematic diagram of the operating lever structure of the present invention;

[0026] Figure 9 This is a partially enlarged schematic diagram of structure A of the present invention;

[0027] Figure 10 This is a partially enlarged schematic diagram of structure B of the present invention.

[0028] In the diagram: 1. Sheath seat; 2. Catheter; 3. Intervention channel; 41. First ratchet; 42. Limiting post; 43. Telescopic sleeve; 44. First spring; 45. Scraper; 46. Abutment rod; 471. Second ratchet; 472. First abutment block; 473. Third ratchet; 474. Push rod; 475. Second abutment block; 476. Second spring; 51. Moving sleeve; 52. Fixing block; 53. Third spring; 6. Operating lever; 7. Crossbar; 8. Pawl; 9. Limiting rod; 10. Hemostatic valve. Detailed Implementation

[0029] 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.

[0030] Please see Figures 1-10 The present invention provides a technical solution: a disposable interventional accessory, including a sheath seat 1, a catheter 2 installed at the front end of the sheath seat 1, an interventional channel 3 provided inside the sheath seat 1, the catheter 2 being connected to the interventional channel 3, a limiting roller being rotatably connected at the entrance of the interventional channel 3, a hemostatic valve 10 being installed at the exit of the interventional channel 3, the front end of the sheath seat 1 being a conical structure, a disinfection and cleaning mechanism being installed inside the middle section of the sheath seat 1, and a stabilizing component being installed at the input end of the sheath seat 1.

[0031] The disinfection and cleaning mechanism includes a first ratchet 41 fitted around the periphery of the intervention channel 3. The first ratchet 41 has mounting grooves on both sides inside. A limiting post 42 is fixedly connected to the bottom of the mounting groove. A telescopic sleeve 43 is fitted around the limiting post 42. The telescopic sleeve 43 is connected to the top of the limiting post 42 via a first spring 44. The end of the telescopic sleeve 43 away from the limiting post 42 extends into the intervention channel 3 and is fixedly connected to a scraper 45. A first disinfectant cotton pad is provided inside the scraper 45. The inner wall of the intervention channel 3 corresponds to... The scraper 45 has a receiving groove, and the inner wall of the intervention channel 3 has a moving groove corresponding to the telescopic sleeve 43. The rear end of the telescopic sleeve 43 is fixedly connected to the abutment rod 46 in the installation groove. The front end of the first ratchet 41 is installed with a pushing component inside the sheath seat 1. The rotation of the first ratchet 41 drives the limit post 42 to rotate, the rotation of the limit post 42 drives the telescopic sleeve 43 to rotate, and the rotation of the telescopic sleeve 43 drives the scraper 45 to rotate along the inner wall of the intervention channel 3. The entry and exit of the intervention channel 3 are disinfected by disinfectant cotton pads.

[0032] In one embodiment of the present invention, the pushing component includes a second ratchet 471, which is rotatably connected to the inner wall of the cavity inside the sheath seat 1 via a bearing. A first abutment block 472 is fixedly connected to the surface of the second ratchet 471 facing the first ratchet 41. The first abutment block 472 is configured as an inclined surface structure with its inclined surface facing the first ratchet 41. A third ratchet 473 is fixedly connected to the periphery of the intervention channel 3 inside the second ratchet 471. A limit rod 9 is rotatably provided on the inner wall of the second ratchet 471, and a torsion bar is provided between the limit rod 9 and the second ratchet 471. The second ratchet 471 and the third ratchet 473 have opposite tooth directions. A limiting block is installed between the first ratchet 41 and the second ratchet 471. The limiting block is fixedly connected to the inner wall of the cavity inside the sheath seat 1. A push rod 474 is installed inside the limiting block corresponding to the first abutment block 472. The push rod 474 slides within the groove inside the limiting block. A second abutment block 475 is fixedly connected to the end of the push rod 474 facing the first ratchet 41. The second abutment block 475 is set as an inclined structure with its inclined surface facing the intervention channel 3. A second spring 4 is sleeved around the push rod 474. 76. The teeth of the first ratchet 41 and the second ratchet 471 are opposite in direction. An operating lever 6 is installed on one side of the outer periphery of the sheath seat 1. The operating lever 6 slides within a limiting groove on one side of the outer periphery of the sheath seat 1. One end of the operating lever 6 extends into the internal cavity of the sheath seat 1 and is fixedly connected to a crossbar 7. Pads 8 are fixedly connected to both ends of the crossbar 7 corresponding to the tooth surfaces of the first ratchet 41 and the second ratchet 471. Pushing the operating lever 6 on the outer periphery of the sheath seat 1 causes the crossbar 7 to move along the internal cavity of the sheath seat 1. The movement of the crossbar 7 along the internal cavity of the sheath seat 1 causes the pads 8 to push the first ratchet 41 and the second ratchet 471. When the two ratchet wheels 471 rotate, since the teeth of the first ratchet wheel 41 and the second ratchet wheel 471 are opposite, the second ratchet wheel 471 rotates while the first ratchet wheel 41 does not rotate. The rotation of the second ratchet wheel 471 drives the first abutment block 472 on its surface to rotate. The rotation of the first abutment block 472 abuts the push rod 474 and moves it toward the first ratchet wheel 41. The push rod 474 moves toward the first ratchet wheel 41, which drives the second abutment block 475 to move toward the first ratchet wheel 41 and abuts the abutment rod 46, causing the telescopic sleeve 43 to extend toward the interior of the intervention channel 3, and causing the scraper 45 to extend out of the receiving groove.

[0033] In one embodiment of the present invention, the stabilizing component includes a movable sleeve 51, which is slidably connected to the inner wall of the intervention channel 3. Fixing blocks 52 are installed on both sides inside the movable sleeve 51, and the fixing blocks 52 slide within the sliding grooves on both sides inside the movable sleeve 51. A third spring 53 is installed at the bottom of the fixing block 52, and one end of the third spring 53 away from the fixing block 52 is connected to the inner wall of the sliding groove. A second disinfectant cotton pad is installed around the movable sleeve 51, and the second disinfectant cotton pad fits against the inner wall of the intervention channel 3. Two sets of fixing blocks 52 are symmetrically arranged, and the ends of the two sets of fixing blocks 52 near the entrance of the intervention channel 3 are set with inclined surfaces facing each other. When a tubing instrument is inserted into the intervention channel 3, the tubing instrument will... As the device passes through the movable sleeve 51, the fixed block 52, with its beveled end near the entrance of the intervention channel 3, makes it easier to insert the catheter into the movable sleeve 51 during intervention. Under the action of the third spring 53, the fixed block 52 inside the movable sleeve 51 is always attached to the surface of catheters of different diameters for fixation and clamping. As the catheter is inserted, the movable sleeve 51 moves along the intervention channel 3 toward the catheter 2 until it reaches the hemostatic valve 10, making the movement of the catheter in the blood vessel more stable. When the catheter is pulled out, the movable sleeve 51 slides out with the catheter. The sliding out of the movable sleeve 51 drives the disinfectant cotton pad on its outer surface to perform preliminary disinfection treatment on the inside of the intervention channel 3 and the outside of the scraper 45.

[0034] Working principle: First, when using the catheter sheath, the tubing instrument is inserted into the intervention channel 3. At this time, the tubing instrument will pass through the movable sleeve 51. Since the fixed block 52 is set with a bevel structure at the end near the entrance of the intervention channel 3, it is easier for the tubing instrument to be inserted into the movable sleeve 51 during intervention. Under the action of the third spring 53, the fixed block 52 in the movable sleeve 51 always adheres to the surface of tubing instruments of different diameters for fixation and clamping. As the tubing instrument is inserted, the movable sleeve 51 will move along the intervention channel 3 towards the catheter 2 until it moves to the hemostasis valve 10, making the movement of the tubing instrument in the blood vessel more stable. When the tubing instrument is pulled out, the movable sleeve 51 will slide out with the tubing instrument. The sliding out of the movable sleeve 51 will drive the disinfection cotton pad on its outer surface to perform preliminary disinfection treatment on the inside of the intervention channel 3 and the outside of the scraper 45.

[0035] After the catheter sheath is used, when further disinfection and cleaning of the inner wall of the intervention channel 3 is required, the operating lever 6 on the periphery of the sheath seat 1 is pushed to move the crossbar 7 along the inner cavity of the sheath seat 1. The crossbar 7 moves along the inner cavity of the sheath seat 1, causing the pawl 8 to push the second ratchet 471 to rotate. Since the teeth of the first ratchet 41 and the second ratchet 471 are opposite, the second ratchet 471 rotates while the first ratchet 41 does not rotate. The rotation of the second ratchet 471 causes the first contact block 472 on its surface to rotate. The rotation of the first contact block 472 abuts the push rod 474 and moves it toward the first ratchet 41. The push rod 474 moves toward the first ratchet 41, causing the second contact block 475 to move toward the first ratchet 41 and abut against the contact rod 46, causing the telescopic sleeve 43 to extend toward the interior of the intervention channel 3, causing the scraper 45 to extend out of the receiving groove. At this time, the operating lever 6 on the periphery of the sheath seat 1 is pushed in the opposite direction, causing the pawl 8 at both ends of the crossbar 7 to move, and the limiting rod set inside the second ratchet 471 to move. When reversed, the pawl 8 at both ends of the crossbar 7 can only drive the first ratchet 41 to rotate. The rotation of the first ratchet 41 drives the limiting post 42 to rotate, which in turn drives the telescopic sleeve 43 to rotate. The rotation of the telescopic sleeve 43 drives the scraper 45 to rotate along the inner wall of the intervention channel 3. The entry and exit of the intervention channel 3 are disinfected by the disinfectant cotton pad. The operating lever 6 is pushed in the opposite direction again, which drives the second ratchet 471 to rotate, causing the push rod 474 to disengage from the first abutment block 472. Under the action of the second spring 476, the push rod 474 moves toward the second ratchet 471, causing the second abutment block 475 to disengage from the abutment rod 46. At this time, the operating lever 6 is pulled back to drive the first ratchet 41 to rotate, causing the scraper 45 to move along the inner wall of the intervention channel 3 until it reaches the receiving groove. Under the action of the first spring 44, it returns to the receiving groove for the next use.

[0036] Contents not described in detail in this specification are prior art known to those skilled in the art. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Terms such as "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail" indicate orientations or positional relationships based on the accompanying drawings, and are used only for ease of description and simplification, not to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A disposable interventional accessory, including a sheath seat (1), characterized in that: The sheath seat (1) is equipped with a catheter (2) at the front end, and an intervention channel (3) is provided inside the sheath seat (1). The catheter (2) is connected to the intervention channel (3). The front end of the sheath seat (1) is set as a conical structure. A disinfection and cleaning mechanism is installed inside the middle section of the sheath seat (1). A stabilizing component is installed at the input end of the sheath seat (1). The disinfection and cleaning mechanism includes a first ratchet (41) sleeved around the intervention channel (3). The first ratchet (41) has mounting grooves on both sides inside. A limiting post (42) is fixedly connected to the bottom of the mounting groove. A telescopic sleeve (43) is sleeved around the limiting post (42). The telescopic sleeve (43) is connected to the top of the limiting post (42) through a first spring (44). The end of the telescopic sleeve (43) away from the limiting post (42) extends into the intervention channel (3) and is fixedly connected to a scraper (45). A first disinfection cotton pad is provided on the inner side of the scraper (45). A receiving groove is opened on the inner wall of the intervention channel (3) corresponding to the scraper (45). A moving groove is opened on the inner wall of the intervention channel (3) corresponding to the telescopic sleeve (43). An abutment rod (46) is fixedly connected to the rear end of the telescopic sleeve (43) in the mounting groove. A pushing component is installed at the front end of the first ratchet (41) inside the sheath seat (1). The pushing assembly includes a second ratchet (471), which is rotatably connected to the inner wall of the cavity inside the sheath seat (1) via a bearing. A first abutment block (472) is fixedly connected to the surface of the second ratchet (471) facing the first ratchet (41). A third ratchet (473) is fixedly connected to the periphery of the intervention channel (3) inside the second ratchet (471). A limit block is installed between the first ratchet (41) and the second ratchet (471). The limit block is fixedly connected to the inner wall of the cavity inside the sheath seat (1). A push rod (474) is installed inside the limit block corresponding to the first abutment block (472). The push rod (474) slides within the groove inside the limit block. A second abutment block (475) is fixedly connected to one end of the push rod (474) facing the first ratchet (41). A second spring (476) is sleeved around the push rod (474).

2. The disposable interventional accessory according to claim 1, characterized in that: The stabilizing component includes a movable sleeve (51), which is slidably connected to the inner wall of the intervention channel (3). Fixing blocks (52) are installed on both sides inside the movable sleeve (51). The fixing blocks (52) are limited to slide in the sliding grooves on both sides inside the movable sleeve (51). A third spring (53) is installed at the bottom of the fixing block (52). The end of the third spring (53) away from the fixing block (52) is connected to the inner wall of the sliding groove. A second disinfectant cotton pad is installed on the periphery of the movable sleeve (51). The second disinfectant cotton pad is in contact with the inner wall of the intervention channel (3).

3. The disposable interventional accessory according to claim 2, characterized in that: An operating rod (6) is installed on one side of the outer periphery of the sheath seat (1). The operating rod (6) slides within a limiting groove on one side of the outer periphery of the sheath seat (1). One end of the operating rod (6) extends into the internal cavity of the sheath seat (1) and is fixedly connected to a crossbar (7). Pawls (8) are fixedly connected to the two ends of the crossbar (7) corresponding to the tooth surfaces of the first ratchet (41) and the second ratchet (471).

4. The disposable interventional accessory according to claim 3, characterized in that: The teeth of the first ratchet (41) and the second ratchet (471) are opposite, and the teeth of the second ratchet (471) and the third ratchet (473) are opposite. A limit rod (9) is rotatably provided on the inner wall of the second ratchet (471), and a torsion spring is provided between the limit rod (9) and the second ratchet (471).

5. The disposable interventional accessory according to claim 4, characterized in that: The first abutment block (472) is configured with an inclined surface facing the first ratchet (41), and the second abutment block (475) is configured with an inclined surface facing the intervention channel (3).

6. The disposable interventional accessory according to claim 2, characterized in that: The fixing blocks (52) are symmetrically arranged in two sets. The two sets of fixing blocks (52) are set with an inclined structure at one end near the entrance of the intervention channel (3), and their inclined surfaces are set opposite to each other.

7. The disposable interventional accessory according to claim 6, characterized in that: The intervention channel (3) is rotatably connected to a limiting roller at its entrance, and a hemostatic valve (10) is installed at its exit.

Images