A conveying system

Abstract

The present invention is applicable to the field of medical device technology and provides a delivery system including an outer sheath assembly, an inner sheath assembly, and a sealing assembly. The outer sheath assembly includes an outer sheath core tube, the inner sheath assembly includes an inner sheath core disposed within the outer sheath core tube, and the sealing assembly includes a first sealing member disposed between the inner sheath core and the outer sheath core tube to seal the gap between the proximal end of the outer sheath core tube and the inner sheath core. The present invention can effectively block blood flowing between the outer sheath core tube and the inner sheath core, preventing blood from flowing out of the product and solving the technical problem of product leakage.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a delivery system. Background Art

[0002] Minimally invasive surgery using stent-graft vascular repair is widely used to treat aortic vascular diseases due to its minimal trauma, rapid recovery, and immediate effectiveness. During clinical implantation, the stent-graft is pre-installed into the sheath of the delivery system. The stent-graft is then delivered to the site of the lesion through the lumen of the human blood vessel and the sheath of the delivery system. Finally, the stent-graft is released from the sheath of the delivery system. The stent-graft isolates the blood flow from the site of the vascular lesion, achieving the purpose of treatment. Because there is a gap between the outer wall of the inner sheath core of the delivery system and the inner lumen of the outer sheath core tube, blood can easily leak out of the gap during surgery, causing bleeding and causing certain harm to the patient. Summary of the Invention

[0003] The purpose of the present invention is to provide a delivery system, aiming to solve the technical problem that the existing delivery system has poor sealing effect, causes blood leakage, and causes harm to patients.

[0004] The present invention is implemented as follows: a conveying system includes an outer sheath assembly, an inner sheath assembly and a sealing assembly, the outer sheath assembly includes an outer sheath core tube, the inner sheath assembly includes an inner sheath core passed through the outer sheath core tube, and the sealing assembly includes a first sealing member, which is arranged between the inner sheath core and the outer sheath core tube to seal the gap between the proximal end of the outer sheath core tube and the inner sheath core.

[0005] The present invention has the beneficial effect of providing a first sealing member between the inner sheath core and the outer sheath core tube in the delivery system. The first sealing member seals the gap between the proximal end of the outer sheath core tube and the inner sheath core, effectively blocking blood from flowing into the gap. This prevents blood from leaking from the product during surgery, thereby resolving the technical issue of product leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 is a longitudinal sectional view of a conveying system according to a first embodiment of the present invention;

[0007] Figure 2 yes Figure 1 A partial enlarged view of

[0008] Figure 3 yes Figure 1 A partial enlarged view of B;

[0009] Figure 4 is a longitudinal sectional view of a conveying system according to a second embodiment of the present invention;

[0010] Figure 5 yes Figure 4 A partial enlarged view of C;

[0011] Figure 6 is a longitudinal sectional view of a sealing tube according to a second embodiment of the present invention;

[0012] Figure 7 is a longitudinal sectional view of a conveying system according to a third embodiment of the present invention;

[0013] Figure 8 yes Figure 7 A partial enlarged view of D;

[0014] Figure 9 This is a longitudinal cross-sectional view of the outer core lock seal of the delivery system of the third embodiment of the present invention. Figure 1 ;

[0015] Figure 10 This is a longitudinal cross-sectional view of the outer core lock seal of the delivery system of the third embodiment of the present invention. Figure 2 ;

[0016] Figure 11 is a partial longitudinal sectional view of a conveying system according to a fourth embodiment of the present invention;

[0017] Figure 12 yes Figure 11 A partial enlarged view E;

[0018] Figure 13 is a partial longitudinal sectional view of a conveying system according to a fifth embodiment of the present invention;

[0019] Figure 14 4 is a longitudinal cross-sectional view of a push rod seal of a conveying system according to a fifth embodiment of the present invention.

[0020] 100-Conveying system,

[0021] 1- Outer sheath assembly,

[0022] 11-outer sheath core tube, 111-inner tube, 113-outer tube,

[0023] 13-proximal release, 131-mounting hole,

[0024] 15-second connecting component, 151-outer core gripper, 1511-claw, 153-outer core lock, 1531-through hole,

[0025] 17-Cavity,

[0026] 3-Inner sheath assembly,

[0027] 31-Inner sheath core,

[0028] 33-rear connector, 331-through hole,

[0029] 35-first connecting component, 351-Luer lock, 3511-near seal, 353-inner core gripper,

[0030] 5-Sealing components,

[0031] 51-first seal, 51a-seal ring, 51b-seal tube, 511b-guide, 51c-proximal releaser seal, 51d-outer core lock seal,

[0032] 53-second sealing member, 53a-protrusion, 53b-push rod sealing pad, 531b-avoidance groove,

[0033] 7 push rod assembly

[0034] 71-Putter,

[0035] 73-Push rod joint,

[0036] 75- third connecting member,

[0037] 77-rear handle, 771-card slot,

[0038] 9-Guide rod. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention 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 the present invention and are not intended to limit the present invention.

[0040] It should be noted that when an element is referred to as being “fixed to” or “disposed on” another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or there may be an intermediate element.

[0041] It should also be noted that the directional terms such as left, right, up, and down in this embodiment are merely relative concepts or are based on the normal use status of the product, and should not be considered as restrictive.

[0042] It should be noted that in the field of interventional medical devices, the end of a medical device implanted in the human or animal body that is closer to the operator is generally referred to as the "proximal end," and the end farther from the operator is referred to as the "distal end." This principle is used to define the "proximal end" and "distal end" of any component of a medical device. "Axial" generally refers to the length of the medical device during delivery, while "radial" generally refers to the direction perpendicular to the "axial" direction of the medical device. This principle is used to define the "axial" and "radial" directions of any component of a medical device.

[0043] As attached Figure 1 As shown, the delivery system 100 provided in the first embodiment of the present invention includes an outer sheath assembly 1, an inner sheath assembly 3, a sealing assembly 5, a push rod assembly 7, a guide rod 9 and a sheath tube (not shown), and the sheath tube is used to accommodate at least the outer sheath assembly 1, the inner sheath assembly 3, and the distal end of the push rod assembly 7.

[0044] The outer sheath assembly 1 includes an outer sheath core tube 11, a proximal release 13 and a second connecting component 15. The second connecting component 15 fixes the outer sheath core tube 11 to the proximal release 13. The outer sheath core tube 11, the proximal release 13 and the second connecting component 15 are assembled to form an integrated structure.

[0045] As attached Figure 1 、 2 As shown, in this embodiment, the outer sheath core tube 11 includes an inner layer tube 111 and an outer layer tube 113 sleeved outside the inner layer tube 111. The hardness of the outer layer tube 113 is greater than the hardness of the inner layer tube 111. The axial lengths of the inner layer tube 111 and the outer layer tube 113 are approximately the same. In this embodiment, the inner layer tube 111 can be a PI tube; the outer layer tube 113 is a stainless steel tube, and the inner layer tube 111 and the outer layer tube 113 are fixedly connected by bonding. Specifically, the inner layer tube 111 is bonded to the outer layer tube 113 with glue. The outer layer tube 113 sleeved outside the inner layer tube 111 can effectively protect the inner layer tube 111 because its hardness is greater than the hardness of the inner layer tube 111, so as to avoid the second connecting component 15 from deforming the inner layer tube 111 due to excessive force when grasping the outer sheath core tube 11.

[0046] The proximal end of the proximal releaser 13 is provided with a mounting hole 131 for receiving the second connecting member 15. The shape of the mounting hole 131 corresponds to the shape of the second connecting member 15. The inner wall of the mounting hole 131 is provided with a thread for connection.

[0047] The second connecting component 15 includes an outer core lock 153 and an outer core gripper 151. The distal end of the outer core lock 153 is provided with an external thread that connects to the inner wall of the mounting hole 131. The distal end of the outer core lock 153 is mounted in the mounting hole 131 of the proximal release 13. The outer core lock 153 is threadedly connected to the proximal release 13. The outer core lock 153 is axially provided with a through hole 1531. The proximal end of the outer core gripper 151 is inserted into the through hole 1531 of the outer core lock 153. The outer core gripper 151 is axially movable relative to the outer core lock 153. A claw 1511 is provided at the distal end of the outer core gripper 151. The claw 1511 is deformable under external force. The outer core gripper 151 is fitted over the outer sheath core tube 11. The claw 1511 grips the outer layer tube 113. The inner walls of the outer core lock 153 and the proximal release 13 are both provided with inclined surfaces that contact the claws 1511. The outer core lock 153 drives the outer core gripper 151 to secure the outer sheath core tube 11 to the proximal release 13. Specifically, when the outer core lock 153 is axially screwed into the proximal release 13, the outer core lock 153 and the proximal release 13 respectively contact the claws 1511. The outer core lock 153 and the proximal release 13 exert radial forces on the claws 1511, which firmly grasp the outer sheath tube 113.

[0048] As attached Figure 1 As shown, the inner sheath assembly 3 includes an inner sheath core 31, a rear connector 33 and a first connecting member 35. The first connecting member 35 fixes the inner sheath core 31 to the rear connector 33. The inner sheath core 31, the rear connector 33 and the first connecting member 35 are assembled to form an integral structure.

[0049] The inner sheath core 31 is inserted into the outer sheath core tube 11. The axial length of the inner sheath core 31 is greater than the axial length of the outer sheath core tube 11. The outer sheath core tube 11 is sleeved on the outside of a portion of the inner sheath core 31.

[0050] The rear connecting member 33 is provided with an axially extending through hole 331. The inner sheath core 31 is inserted into the through hole 331. The rear connecting member 33 is fixedly connected to the first connecting member 35. In this embodiment, the connection between the rear connecting member 33 and the first connecting member 35 is similar to the connection between the proximal release 13 and the second connecting member 15 in the outer sheath assembly 1. The proximal end of the rear connecting member 33 is threadedly connected to the first connecting member 35.

[0051] The first connecting component 35 includes a Luer lock 351 and an inner core gripper 353. A proximal seal 3511 is mounted within the Luer lock 351. This proximal seal 3511 is located at the proximal end of the first connecting component 35. This seal provides a seal for preoperative venting. The distal end of the Luer lock 351 is provided with external threads that connect to the rear connector 33. The distal end of the Luer lock 351 is inserted into the proximal end of the rear connector 33. The Luer lock 351 is threadedly connected to the rear connector 33. The inner core gripper 353 has the same shape, fixing method, and operating principle as the outer core gripper 151. The proximal end of the inner core gripper 353 is inserted into the Luer lock 351. The inner core gripper 353 is axially movable relative to the Luer lock 351. The distal end of the inner core gripper 353 is provided with a claw that deforms under external force. The inner core gripper 353 is mounted on the outer surface of the inner sheath core 31. The claws grip the inner sheath core 31. The inner walls of the Luer lock 351 and the rear connector 33 are both provided with inclined surfaces that contact the claws. When the Luer lock 351 is axially screwed into the rear connector 33, the Luer lock 351 and the rear connector 33 apply radial force to the claws, which firmly grip the inner sheath core 31. The first connecting assembly 35 secures the inner sheath core 31 to the rear connector 33.

[0052] As attached Figure 1-3 As shown, the sealing assembly 5 of the present embodiment comprises a first sealing member 51. The first sealing member 51 is arranged between the inner sheath core 31 and the outer sheath core tube 11. The first sealing member 51 is used to seal the gap between the proximal end of the outer sheath core tube 11 and the inner sheath core 31 to prevent blood during surgery from flowing out along the gap between the outer sheath core tube 11 and the inner sheath core 31. The first sealing member 51 extends along the length direction of the outer sheath core tube 11. At least part of the first sealing member 51 is arranged between the outer sheath core tube 11 and the inner sheath core 31.

[0053] The first sealing member 51 can have a variety of structures. In the present embodiment, the first sealing member 51 includes at least one sealing ring 51a. The sealing ring 51a is arranged between the outer sheath core tube 11 and the inner sheath core 31. Specifically, the sealing ring 51a is arranged between the outer wall of the inner sheath tube core 31 and the inner wall of the inner layer tube 111. The sealing ring 51a is connected to the inner sheath core 31 or the outer sheath core tube 11. In the present embodiment, the sealing ring 51a is fixedly connected to the inner sheath tube core 31 by means of glue or welding. In order to increase the sealing effect, the number of sealing rings 51a in the present embodiment is multiple. The sum of the axial lengths of the multiple sealing rings 51a is less than the axial length of the inner sheath tube core 31. The multiple sealing rings 51a extend discontinuously along the length direction of the outer sheath core tube 11.

[0054] The sealing ring 51a is sleeved on the outside of the inner sheath core 31. A plurality of sealing rings 51a are arranged along the axial direction of the inner sheath core 31. The outer diameters of the plurality of sealing rings 51a change regularly. Specifically, from the distal end of the inner sheath core 31 to the proximal end of the inner sheath core 11, the radial distance between the sealing ring 51a and the outer sheath core tube 11 gradually decreases. That is, from the distal end of the inner sheath core 31 to the proximal end of the inner sheath core 31, the outer wall of the sealing ring 51a gradually approaches the inner wall of the outer sheath core tube 11. As shown in the attached Figure 1 As shown, the inner diameter of the outer sheath core tube 11 is d. Three sealing rings 51a are sequentially provided along the distal end of the outer sheath core tube 11 to the proximal end of the outer sheath core tube 11. The outer diameters of the three sealing rings 51a are outer diameter d1, outer diameter d2 and outer diameter d3, respectively. Among them, the inner diameter d of the outer sheath core tube 11, the outer diameters d1, outer diameter d2 and outer diameter d3 of the three sealing rings 51a, satisfy the following relationship:

[0055]

[0056] The outer diameters d1 , d2 , and d3 of the three sealing rings 51 a gradually increase, but are always smaller than the inner diameter d of the outer sheath core tube 11 .

[0057] The gap between the outer wall of sealing ring 51a and the inwall of outer sheath core pipe 11 progressively reduces.Keep certain spacing between each sealing ring 51a.The purpose of designing like this is, when blood flows through first sealing ring 51a that external diameter is d1, because the gap reduces, is subject to resistance effect, and blood flow reduces.After passing through one section of normal gap section again, blood flow pressure reduces at this moment, and when passing through the sealing ring 51a that next gap is less, blood flow and blood flow pressure further reduce.Through the obstruction effect of a plurality of different sealing rings 51a, progressively reduce blood flow and blood flow pressure, to reach the effect of sealing.This sealing structure, by the mode that reduces the gap of outer sheath core pipe 11 and inner sheath core 31 local positions, both can obtain sealing effect preferably, also can not obviously increase the resistance that outer sheath core pipe 11 moves axially relative to inner sheath core 31.

[0058] As attached Figure 1 As shown, the push rod assembly 7 includes a push rod 71 , a push rod joint 73 , a third connecting component 75 and a rear handle 77 .

[0059] The outer sheath core tube 11 is inserted into the push rod 71 . The axial length of the push rod 71 is smaller than the axial length of the outer sheath core tube 11 .

[0060] The push rod joint 73 is sleeved on the outside of the push rod 71. The axial length of the push rod joint 73 is less than the axial length of the push rod 71. The proximal end of the push rod joint 73 is provided with a connection structure fixed to the third connecting member 75. Usually, a threaded structure for connection is provided at the proximal end of the push rod joint 73.

[0061] The third connecting member 75 is sleeved over the push rod 71. The axial length of the third connecting member 75 is less than that of the push rod 71. The third connecting member 75 is provided with external threads that mate with the push rod joint 73. The third connecting member 75 is screwed into the push rod joint 73. The third connecting member 75 and the push rod joint 73 are threadedly connected to form an outer sleeve. The axial length of the outer sleeve is approximately the same as the axial length of the push rod 71.

[0062] The proximal end of the push rod 71 is inserted into the third connecting member 75. The proximal end of the push rod 71 is fixedly connected to the inner wall of the third connecting member 75. The third connecting member 75 fixes the push rod 71 to the push rod joint 73. The push rod 71, the push rod joint 73 and the third connecting member 75 are assembled to form an integrated structure.

[0063] The rear handle 77 includes a receiving cavity. The push rod 71, the push rod joint 73, and the third connecting member 75 are disposed in the receiving cavity of the rear handle 77. The rear handle 77 is connected to the third connecting member 75. The proximal ends of the third connecting member 75 and the proximal ends of the push rod 71 abut against the rear handle 77.

[0064] As attached Figure 1 As shown, the guide rod 9 is used to connect the outer sheath assembly 1, the inner sheath assembly 3 and the push rod assembly 7. The proximal end of the guide rod 9 is inserted into the rear connecting piece 33 of the inner sheath assembly 3. The proximal end of the guide rod 9 is fixedly mounted in the rear connecting piece 33. The middle part of the guide rod 9 is passed through the proximal releaser 13 of the outer sheath assembly 1. The proximal releaser 13 is assembled on the guide rod 9. Under the action of external force, the proximal releaser 13 can slide along the axial direction of the guide rod 9. The distal end of the guide rod 9 is inserted into the rear handle 77 of the push rod assembly 7. The distal end of the guide rod 9 is fixedly mounted in the rear handle 77. The rear handle 77 is fixedly connected to the rear connecting piece 33 through the guide rod 9.

[0065] As attached Figure 4 As shown, the delivery system 100 provided in the second embodiment of the present invention includes an outer sheath assembly 1, an inner sheath assembly 3, a first sealing member 51, a push rod assembly 7 and a guide rod 9. Compared with the first embodiment, the main difference between the second embodiment and the first embodiment lies in the specific structure of the first sealing member 51.

[0066] As attached Figure 4 、 6 As shown, the first sealing member 51 of this embodiment includes a sealing tube 51b. The sealing tube 51b is provided through the outer sheath core tube 11 and extends continuously along the length direction of the outer sheath core tube 11. The sealing tube 51b is provided between the outer wall of the inner sheath core tube 31 and the inner wall of the inner layer tube 111.

[0067] The distal end of the sealing tube 51b is provided with a guide member 511b. The guide member 511b is used to introduce the blood flow between the inner sheath core 31 and the sealing tube 51b. The guide member 511b is in the shape of a bell mouth. From the distal end of the sealing tube 51b to the proximal end of the sealing tube 51b, the inner diameter of the guide member 511b gradually decreases. Specifically, the diameter of the distal end of the guide member 511b is d1, the outer diameter of the sealing tube 51b is d2, and the inner diameter of the outer sheath core tube 11 is d. Among them, the inner diameter d of the outer sheath core tube 11, the diameter d1 of the distal end of the guide member 511b and the outer diameter d2 of the sealing tube 51b satisfy the following relationship:

[0068] and

[0069] The distal end of the guide member 511b is interference fit with the outer sheath core tube 11. The diameter d1 of the distal end of the guide member 511b should be slightly larger than the inner diameter d of the outer sheath core tube 11, but should not be too large, as this may cause assembly difficulties and increase the resistance to axial movement of the outer sheath core tube 11. The outer diameter d2 of the sealing tube 51b should be smaller than the inner diameter d of the outer sheath core tube 11 so that the outer sheath core tube 11 can move smoothly in the axial direction.

[0070] The proximal end of the sealing tube 51b is connected to the proximal end of the inner sheath core 31. The hardness of the sealing tube 51b is greater than that of the silicone, and the distal end of the guide member 511b is in line contact with the inner cavity of the outer sheath core tube 11, forming an interference fit, thereby improving the support force and sealing performance of the guide member 511b on the outer sheath core tube 11, and avoiding the situation where the distal end of the guide member 511b is squeezed and deformed, thereby reducing the diversion efficiency.

[0071] As attached Figure 4 、 5 As shown, the distal end of the sealing tube 51b is interference fit with the outer sheath core tube 11. The proximal end of the sealing tube 51b passes through the rear connector 33 and is sealedly connected to the proximal sealing member 3511 of the first connecting member 35. Specifically, the proximal end of the sealing tube 51b passes through the rear connector 33 and is inserted into the proximal sealing member 3511.

[0072] In this embodiment, the blood flows to the guide 511b, and the passage is not blocked. Instead, the blood flow is introduced into the gap between the inner sheath core 31 and the inner cavity of the sealing tube 51b through the guide 511b of the sealing tube 51b. The sealing tube 51b and the inner sheath core 31 are relatively static components in the conveying system 100. The end of the sealing tube 51b is inserted into the proximal sealing member 3511 to achieve a sealing effect. The proximal sealing member 3511 of this embodiment can not only seal the proximal blood flow, but also meet the exhaust requirements of the inner sheath core 31. In other embodiments, the proximal end of the sealing tube 51b can also be fixedly connected to the proximal end of the inner sheath core 31 by gluing or welding.

[0073] The sealing tube 51b is designed to direct blood flow from the lumen of the outer sheath assembly 1 into the lumen formed between the inner sheath assembly 3 and the sealing tube 51b. This not only prevents blood from flowing out of the proximal end of the outer sheath assembly 1 but also simplifies the sealing structure. Furthermore, the flared design of the guide 511b not only achieves a line-of-contact seal but also minimizes the increased motion resistance of the outer sheath assembly 1 due to the seal, while achieving a good sealing effect.

[0074] As attached Figure 7 As shown, the delivery system 100 provided in the third embodiment of the present invention includes an outer sheath assembly 1, an inner sheath assembly 3, a first sealing member 51, a push rod assembly 7 and a guide rod 9. Compared with the first embodiment, the third embodiment differs in the specific structure of the first sealing member 51.

[0075] As attached Figure 7 and Figure 8 As shown, the second connecting member 15 of this embodiment fixes the outer sheath core tube 11 to the proximal release 13. A cavity 17 is formed between the proximal release 13 and the second connecting member 15 to facilitate adjustment of the proximal position of the outer sheath core tube 11. The cavity 17 is located between the proximal release 13 and the outer core lock head 153. The first sealing member 51 of this embodiment seals the cavity 17.

[0076] In this embodiment, there are two first sealing members 51. These two first sealing members 51 are located near or at the distal end of the proximal release 13 and the proximal end of the outer core locking head 153, respectively. Specifically, one first sealing member 51 is a proximal release sealing gasket 51c disposed at the distal end of the proximal release 13. The other first sealing member 51 is an outer core locking head sealing gasket 51d disposed at the proximal end of the outer core locking head 153. It is understood that in other embodiments, the number of first sealing members 51 may be three, four, or more, depending on actual needs.

[0077] By increasing proximal releaser sealing pad 51c and outer core lock head sealing pad 51d, a completely closed inner cavity is formed between proximal releaser 13 and outer core lock head 153. Outer core lock head sealing pad 51d is positioned by outer core gripper 151 and outer core lock head 153 inner cavity end face, prevents outer core lock head sealing pad 51d from swaying along the axial direction. Due to being provided with braided mesh tube or spring tube in the tube wall of the sheath tube that accommodates outer sheath core tube 11, sheath tube needs to be processed through steps such as cleaning, hydrophilic coating coating before being assembled with elements such as outer sheath core tube 11, inner sheath core 31, in these processing, sheath tube may be shortened or elongated, this just makes the sheath tube that shortens or elongates need to adopt the outer sheath core tube 11 of different lengths, again because the length of the outer sheath core tube 11 adopted by the sheath tube of same length specification is generally fixed value, also unlikely to cut off or stretch outer sheath core tube 11, thereby reduced the matching degree between outer sheath core tube 11 and the sheath tube. In the present invention, by forming the cavity 17 that is convenient to adjust the proximal position of outer sheath core tube 11 between proximal releaser 13 and second connecting member 15, thereby in the inner cavity that proximal releaser 13 and outer core lock 153 are sealed, reserve enough space for outer sheath core tube 11 axial variation, and then can reach the purpose of adapting these micro-deformed sheath tubes, improve the assembly precision of conveying system, and simplify assembly step. After blood flow flows out from the gap between outer sheath core tube 11 and inner sheath core 31 through the proximal end of outer sheath core tube 11, enter cavity 17, after cavity 17 is filled, blood flow may only enter the space between outer core gripper 151 and outer sheath core tube 11, just because of the existence of proximal releaser sealing pad 51c and outer core lock seal 51d, make blood only in the closed cavity formed between these two seals 51d and 51c, no longer flow out to outside from the proximal end of outer sheath core tube 11.

[0078] The proximal release seal 51c is located at the distal end of the outer core gripper 151 and cooperates with the outer sheath core tube 11. The proximal release seal 51c is sleeved on the outer sheath core tube 11. The inner diameter of the proximal release seal 51c should not be too large or too small. If it is too large, it will easily increase the resistance to the axial movement of the outer sheath core tube 11. If it is too small, it may lead to poor sealing effect.

[0079] The outer core lock head seal 51d and the inner sheath core 31 need to move relative to each other. Figure 9 Serrated surface as shown, or as shown in the attached Figure 10 The arc surface shown.

[0080] Attach Figure 10 As an example of the arc surface in the figure, the inner diameter D1 of the outer core lock head sealing gasket 51d is the same as that of the attached Figure 7 The outer diameter d1 of the inner sheath core 31 satisfies the following relationship:

[0081]

[0082] Because the outer core lock head sealing pad 51d is in line contact with the inner sheath core 31. Adopting this contact mode, when reaching the sealing effect, the resistance that the outer core lock head sealing pad 51d brings to the inner sheath core 31 can be reduced.

[0083] As attached Figure 11 FIG. 1 shows a delivery system 100 according to a fourth embodiment of the present invention. Compared to the first embodiment, the sealing assembly 5 includes not only a first sealing member (not shown) but also a second sealing member 53. The first sealing member of this embodiment can adopt the structure of any of the first sealing members 51 in embodiments 1-3, and will not be elaborated on in detail here.

[0084] As attached Figure 11 As shown, the second sealing member 53 of this embodiment seals the blood leakage between the outer sheath core tube 11 and the inner cavity of the push rod 71. The second sealing member 53 can seal the gap between the outer sheath core tube 11 and the push rod 71.

[0085] The second sealing member 53 may have various structures, such as Figure 12 As shown, in the present embodiment, the second sealing member 53 includes at least one protrusion 53a. The protrusion 53a is located between the outer sheath core tube 11 and the push rod 71 to reduce the gap between the outer sheath core tube 11 and the push rod 71. The protrusion 53a of the present embodiment is arranged on the push rod 71, and the protrusion 53a and the push rod 71 are an integral structure. Specifically, the push rod 71 of the present embodiment adopts a high molecular thermoplastic material, and the push rod 71 shrinks when heated to form a shrinkage, and the shrinkage is the protrusion 53a. In other embodiments, the protrusion 53a can also be separately molded from the push rod 71, and then fixed together by gluing, screwing, etc.

[0086] As attached Figure 11 As shown, in order to improve the sealing effect, the number of the protrusions 53a in this embodiment is multiple and the multiple protrusions 53a are arranged along the axial direction of the push rod 71.

[0087] The inner diameter size of projection 53a changes regularly. From the far end of push rod 71 to the near end of push rod 71, the radial distance between projection 53a and outer sheath core tube 11 gradually decreases. That is, from the far end of outer sheath core tube 11 to the near end of outer sheath core tube 11, the inner wall of projection 53a gradually approaches the outer wall of outer sheath core tube 11.

[0088] As attached Figure 11 As shown, the inner diameter of the push rod is d1, and the outer diameter of the outer sheath core tube 11 is d2. In this embodiment, three protrusions 53a are sequentially provided along the distal end of the push rod 71 to the proximal end of the push rod 71, and the inner diameters of the three protrusions 53a are D1, D2 and D3 respectively. Among them, the inner diameter d1 of the push rod, the outer diameter d2 of the outer sheath core tube 11, and the inner diameters D1, D2 and D3 of the three protrusions 53a satisfy the following relationship:

[0089]

[0090] The inner diameter of the protrusion 53a gradually decreases from the distal end of the push rod 71 to the proximal end of the push rod 71. A certain distance must be maintained between each protrusion 53a. The purpose of this design is that when blood flows through the first protrusion 53a, the gap is reduced and the blood flow is reduced due to resistance. After passing through a normal gap section, the blood flow pressure is reduced. When it passes through the next protrusion 53a with an even smaller gap, the blood flow and blood pressure are further reduced. Through the obstruction of multiple protrusions 53a with different inner diameters, the blood flow and blood pressure are gradually reduced to achieve a sealing effect. This method is simple to operate, and it is easy to implement the protrusion 53a at a local position, and the dimensional accuracy is easy to control. The structural design of the protrusion 53a only reduces the local gap between the outer sheath core tube 11 and the inner cavity of the push rod 71, and has little effect on the circumferential movement of the outer sheath core tube 11. It does not significantly increase the resistance to the circumferential movement of the outer sheath core tube 11, and no new components are added. It can achieve a good sealing effect and reduce the risk of blood leakage.

[0091] As attached Figure 13 FIG. 1 shows a delivery system 100 according to a fifth embodiment of the present invention. The primary difference between the fifth embodiment and the fourth embodiment lies in the specific structure of the second sealing member 53. The first sealing member (not shown) of this embodiment can employ the structure of any of the first sealing members 51 of embodiments 1-3, and will not be further elaborated upon herein.

[0092] The second sealing member 53 of this embodiment is located between the outer sheath core tube 11 and the push rod 71 to seal the gap between the outer sheath core tube 11 and the inner cavity of the push rod 71. A slot 771 with an opening toward the distal end is provided on the rear handle 77 corresponding to the push rod 71. The second sealing member 53 is disposed in the slot 771.

[0093] As attached Figure 13 、 14 As shown, specifically, the second sealing member 53 includes a push rod gasket 53b. The push rod gasket 53b is disposed at the proximal end of the push rod 71. In this embodiment, the push rod 71 extends beyond the proximal edge of the third connecting member 75. The push rod gasket 53b is fitted over the extended push rod 71. The push rod 71 and the push rod gasket 53b are inserted together into the retaining groove 771 of the rear handle 77. The push rod 71 secures the push rod gasket 53b to the rear handle 77.

[0094] As attached Figure 14 As shown, a clearance groove 531b is provided on the push rod sealing gasket 53b near the third connecting member 75. The inner diameter of the clearance groove 531b gradually decreases from the distal end of the outer sheath core tube 11 to the proximal end of the outer sheath core tube 11.

[0095] As attached Figure 13 、 14 As shown, the push rod seal 53b, the push rod 71, the outer sheath core tube 11, and the inner sheath core 12 must meet certain matching relationships:

[0096] The inner diameter D1 of the push rod seal 53b and the outer diameter d1 of the push rod 71 satisfy the following relationship:

[0097]

[0098] The push rod seal 53b and the push rod 71 hole shaft need to maintain a certain amount of interference to achieve the sealing effect;

[0099] The maximum inner diameter D2 of the air-avoiding groove 531b and the inner diameter d2 of the push rod 71 satisfy the following relationship:

[0100]

[0101] This is an air-avoidance structure. The maximum inner diameter D2 of the air-avoidance groove 531b is larger than the inner diameter d2 of the push rod 71 to prevent the push rod sealing gasket 53b made of soft material from being stuck in the gap between the outer sheath core tube 11 and the push rod 71 when the outer sheath core tube 11 moves axially relative to the push rod 71, thereby increasing the friction between the two.

[0102] The inner diameter D3 of the push rod seal 53b and the outer diameter d3 of the outer sheath core tube 11 satisfy the following relationship:

[0103]

[0104] That is, the outer diameter of the outer sheath core tube 11 is greater than or equal to 1.1 times the inner diameter of the push rod seal 53b, and less than or equal to 1.5 times the inner diameter of the push rod seal 53b. This is because the fit between the outer diameter of the outer sheath core tube 11 and the through hole of the push rod seal 53b cannot be too large or too small. If it is too large, it is easy to increase the resistance to the axial movement of the outer sheath core tube 11. If it is too small, it may lead to poor sealing effect.

[0105] The length t of the sealing section of the push rod seal 53b satisfies the following relationship:

[0106] t=(1~3)mm

[0107] That is, the length of the sealing section is greater than or equal to 1 mm and less than or equal to 3 mm. This is because the length of the sealing section of the push rod sealing gasket 53b should not be too small or too large. If it is too small, it may lead to poor sealing effect. If it is too large, it may increase the resistance to axial movement of the outer sheath core tube 11.

[0108] In this embodiment, by adding the structural design of the push rod sealing gasket 53b, the gap between the outer sheath core tube 11 and the inner cavity of the push rod 71 can be completely blocked to achieve a complete sealing effect.

[0109] When using conveying system 100, outer sheath assembly 1, under external force, slides axially along conduit 9 to release the bare wave coil of operating support.Inner sheath core 31 keeps static state in outer sheath core pipe 11 axial movement processes.In order to ensure the fluency that outer sheath assembly 1 moves, a certain gap is left between outer sheath core pipe 11 and inner sheath core 31. During the operation, the blood that flows out along the gap between outer sheath core pipe 11 and inner sheath core 31 is hindered by the first sealing member 51, effectively avoiding blood from flowing out from the near-end of outer sheath core pipe 11. In addition, the blood that flows out along the gap between outer sheath core pipe 11 and push rod 71 inner chambers is hindered by the second sealing member 53, further avoiding blood from flowing out from the near-end of outer sheath core pipe 11.

[0110] The sealing properties of existing conveyor systems primarily rely on reducing gaps between components. Because the length tolerances of individual conveyor system components are difficult to precisely control, conventional sealing structures struggle to meet the requirements of mass production. The conveyor system 100 of the present invention not only solves the problem of product leakage, but also ensures the normal movement of moving components and allows for larger dimensional tolerances within component lengths, thus reducing manufacturing tolerance requirements and lowering production costs.

[0111] It can be understood that the sealing principle between the inner sheath core tube and the outer sheath core tube can also be adopted between the outer sheath core tube and the push rod according to actual needs to achieve sealing between the outer sheath core tube and the push rod; the sealing principle between the inner sheath core tube and the outer sheath core tube can also be adopted between the inner sheath core tube and the push rod according to actual needs to achieve sealing between the inner and outer sheath core tubes.

[0112] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A conveying system, characterized in that: The seal assembly includes an outer sheath component, an inner sheath component and a sealing component, wherein the outer sheath component includes an outer sheath core tube, the inner sheath component includes an inner sheath core passed through the outer sheath core tube, and the sealing component includes a first sealing member, which is arranged between the inner sheath core and the outer sheath core tube to seal the gap between the proximal end of the outer sheath core tube and the inner sheath core; the conveying system also includes a push rod component, the push rod component includes a push rod, and the outer sheath core tube is passed through the push rod; the sealing component also includes a second sealing member, which can seal the gap between the outer sheath core tube and the push rod; the second sealing member includes a plurality of protrusions, a plurality of the protrusions are arranged on the push rod, and the protrusions protrude in a direction close to the outer sheath core tube, and a plurality of the protrusions are located between the outer sheath core tube and the push rod; a plurality of the protrusions are arranged along the axial direction of the push rod, and the radial distance between the protrusions and the outer sheath core tube gradually decreases from the distal end of the push rod to the proximal end of the push rod.

2. The conveying system according to claim 1, wherein The first sealing member extends along the length direction of the outer sheath core tube.

3. The conveying system according to claim 2, wherein: The first sealing member includes at least one sealing ring, which is connected to the inner sheath core or the outer sheath core tube, and is arranged between the outer sheath core tube and the inner sheath core.

4. The conveying system according to claim 3, wherein: There are multiple sealing rings, and the multiple sealing rings are arranged along the axial direction of the inner sheath core; the sealing ring is sleeved outside the inner sheath core, and the radial distance between the sealing ring and the outer sheath core tube gradually decreases from the distal end of the inner sheath core to the proximal end of the inner sheath core.

5. The conveying system according to claim 2, wherein: The first sealing member includes a sealing tube, the proximal end of which is connected to the proximal end of the inner sheath assembly.

6. The conveying system according to claim 5, wherein: The sealing tube is passed through the outer sheath core tube; the inner sheath assembly also includes a rear connecting piece and a first connecting piece, the first connecting piece fixes the inner sheath core on the rear connecting piece, and the proximal end of the first connecting piece is provided with a proximal sealing piece, the proximal end of the sealing tube passes through the rear connecting piece and is sealed and connected to the proximal sealing piece of the first connecting piece.

7. The conveying system according to claim 6, wherein: A guide is provided at the distal end of the sealing tube. The inner diameter of the guide gradually decreases from the distal end to the proximal end of the sealing tube. The guide is used to introduce blood flow between the inner sheath core and the sealing tube. The distal end of the guide is interference fit with the outer sheath core tube.

8. The conveying system according to claim 1, wherein: The outer sheath assembly also includes a proximal releaser and a second connecting component, which fixes the outer sheath core tube to the proximal releaser. A cavity is formed between the proximal releaser and the second connecting component to facilitate adjustment of the distal position of the outer sheath core tube. The first sealing component can seal the cavity.

9. The conveying system according to claim 8, wherein: The second connecting component includes an outer core gripper and an outer core locking head, and the outer core locking head drives the outer core gripper to fix the outer sheath core tube on the proximal releaser; the cavity is located between the proximal releaser and the outer core locking head, and the number of the first seals includes two, and the two first seals are respectively close to the distal end of the proximal releaser and the proximal end of the outer core locking head, or the two first seals are respectively located at the distal end of the proximal releaser and the proximal end of the outer core locking head.

10. The conveying system according to claim 1, wherein: The push rod assembly further includes a push rod joint and a third connecting component, wherein the third connecting component fixes the push rod to the push rod joint.

11. The conveying system according to claim 10, wherein: The push rod assembly also includes a rear handle, which is connected to the third connecting component. The proximal end of the push rod is inserted into the third connecting component. A groove is provided on the rear handle corresponding to the push rod, and the second sealing member is provided in the groove.

12. The conveying system according to claim 11, wherein: The second sealing member includes a push rod sealing pad, and a space-avoiding groove is provided on the push rod sealing pad at a position close to the third connecting component. The inner diameter of the space-avoiding groove gradually decreases from the distal end of the outer sheath core tube to the proximal end of the outer sheath core tube.

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