US-12622796-B2 - Conveyor and lumen apparatus conveying system

US12622796B2US 12622796 B2US12622796 B2US 12622796B2US-12622796-B2

Abstract

A conveyor and a lumen apparatus delivery system. The conveyor includes a sheath core tube, a delivery sheath and an operating handle. The proximal end of the sheath core tube and the proximal end of the delivery sheath are both connected to the operating handle. The delivery sheath and the sheath core tube are both a hollow tube. The delivery sheath is sleeved on the sheath core tube in an axially slidable manner, and the delivery sheath and the sheath core tube cooperatively define a storable cavity. The delivery sheath includes a loading portion, a pushing portion and a connecting portion. The proximal end of the loading portion is connected to the distal end of the pushing portion; the proximal end of the pushing portion is connected to the distal end of the connecting portion, and the proximal end of the connecting portion is connected to the operating handle.

Inventors

Benhao XIAO
Junqiang ZHANG

Assignees

LIFETECH SCIENTIFIC (SHENZHEN) CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20201216
Priority Date: 20191227

Claims (17)

1 . A conveyor, comprising: a sheath core tube, a delivery sheath and an operating handle, wherein a proximal end of the sheath core tube and a proximal end of the delivery sheath are both connected to the operating handle; each of the delivery sheath and the sheath core tube is a hollow tube; the delivery sheath is sleeved on the sheath core tube in an axially slidable manner, and the delivery sheath and the sheath core tube cooperatively define a storable cavity; the delivery sheath is an integrated structure, the delivery sheath comprises a loading portion, a pushing portion, and a connecting portion, and the loading portion, pushing portion, and connecting portion are integrally formed; a proximal end of the loading portion is connected to a distal end of the pushing portion; a proximal end of the pushing portion is connected to a distal end of the connecting portion, and a proximal end of the connecting portion is connected to the operating handle; an inner diameter of the loading portion is 0.05-1 mm larger than that of the pushing portion, and an outer diameter of the loading portion is equal to that of the pushing portion; and a ratio of an axial length of the loading portion to a total length of the conveying/delivery sheath is in a range from 1% to 5%; wherein the operating handle comprises a fixed handle and a movable handle, the fixed handle is positioned distally of the movable handle, and a proximal end of the fixed handle is opposite to a distal end of the movable handle; the proximal ends of the sheath core tube and the delivery sheath are both axially threaded into the fixed handle and the movable handle; and the sheath ore tube is fixedly connected to the fixed handle, and the delivery sheath is fixedly connected to the movable handle, such that the movable handle is configured to drive the delivery sheath to slide axially relative to the sheath core tube to release a lumen apparatus.
2 . The conveyor according to claim 1 , wherein the pushing portion comprises a first region and a second region axially connected to the first region; a wall thickness of the second region is constant, and an inner diameter of the loading portion is 0.05 to 1 mm larger than that of the second region; a distal end of the first region is connected to the proximal end of the loading portion; and from the distal end to a proximal end of the first region, a wall thickness of the first region gradually increases from a numerical value equal to a wall thickness of the loading portion to a numerical value equal to the wall thickness of the second region.
3 . The conveyor according to claim 1 , wherein along a radial direction from inside to outside, the delivery sheath comprises an inner tube, a middle tube, and an outer tube in sequence; the middle tube is sleeved on the inner tube; and the outer tube is sleeved on the middle tube.
4 . The conveyor according to claim 3 , wherein the inner tube is a polytetrafluoroethylene (PTFE) tube; the middle tube is a stainless steel wire woven net tube; and the outer tube is a Pebax tube.
5 . The conveyor according to claim 3 , wherein a distal end surface of the inner tube is flush with a distal end surface of the outer tube; and a distal end surface of the middle tube is closer to a proximal end surface of the inner tube than the distal end surface of the inner tube.
6 . The conveyor according to claim 1 , wherein the conveyor further includes a guide head, which is a conical hollow cavity structure with openings in two ends, the sheath core tube comprises a first inner tube and a second inner tube fixedly connected to a proximal end of the first inner tube; and an outer diameter of the second inner tube is greater than that of the first inner tube; a distal end of the sheath core tube extends into the guide head from the open end of a proximal end of the guide head and is fixedly connected to the guide head, a cavity of the sheath core tube is communicated with the cavity of the guide head to form a guide wire channel.
7 . The conveyor according to claim 1 , wherein the conveyor further comprises a sheath tube connector; the sheath tube connector is connected to the connecting portion of the delivery sheath; and the delivery sheath is connected to the operating handle through the sheath tube connector.
8 . The conveyor according to claim 7 , wherein the sheath tube connector comprises a connecting part and a fixed part connected to the connecting part; the connecting part is sleeved on the connecting portion; an outer diameter of the connecting portion is greater than that of the pushing portion; and the fixed part is fixedly connected to the operating handle.
9 . The conveyor according to claim 7 , wherein the delivery sheath is fixedly connected to the movable handle through the sheath tube connector.
10 . A lumen apparatus conveying system, comprising: a lumen apparatus and the conveyor according to claim 1 , and the lumen apparatus is accommodated in a storable cavity.
11 . The conveyor according to claim 2 , wherein an axial length of the first region is 3 to 10 mm.
12 . The conveyor according to claim 5 , wherein a distance between the distal end surface of the inner tube and the distal end surface of the middle tube is 1 to 3 mm.
13 . The conveyor according to claim 5 , wherein the delivery sheath further includes a mark ring, which is sleeved on the distal end of the middle tube and embedded into a wall of the outer tube, and a distal end surface of the mark ring is flush with the distal end surface of the middle tube.
14 . The conveyor according to claim 6 , wherein the first inner tube is a tubular structure with an equal outer diameter, and the second inner tube is also a tubular structure with an equal outer diameter; an inner diameter of the first inner tube is less than that of the second inner tube, and the second inner tube is sleeved and fixed at the proximal end of the first inner tube.
15 . The conveyor according to claim 6 , wherein an inner diameter of the first inner tube is equal to an inner diameter of the second inner tube, and the sheath core tube is formed as an integral tube.
16 . The conveyor according to claim 6 , wherein in a loaded state, a distal end surface of the delivery sheath abuts against a proximal end surface of the guide head, or a distal end of the delivery sheath is sleeved on the proximal end of the guide head.
17 . The conveyor according to claim 8 , wherein the connecting part is a hollow cylindrical structure, the fixing part is two sheet-like structures, and the two sheet-like structures are symmetrically arranged on a side surface of the connecting part by taking a central axis of the connecting part as a symmetry axis and extend from the side surface of the connecting part towards a direction away from the side surface.

Description

TECHNICAL FIELD The embodiments relate to the field of interventional apparatuses, in particular to a conveyor and a lumen apparatus conveying system. BACKGROUND This section provides background information related to the present disclosure, which is not necessarily the prior art. For vascular diseases, an interventional therapy is mainly to convey a conveyor loaded with a vascular stent to a pre-designated position of a vascular lesion by means of human puncture, and then a sheath is withdrawn to release the stent. The stent covers the vascular lesion position to achieve the objective of treating vascular diseases. The interventional therapy that is used to treat the vascular diseases has the characteristics of low cost, short treatment period and less trauma to a human body, so it has gradually become the mainstream way to treat the vascular diseases. The interventional therapy has certain requirements on a delivery sheath of the conveyor, which are reflected in the following aspects: (1) an inner diameter of the delivery sheath should be designed so that the stent can be loaded into the delivery sheath after being compressed. (2) The outer diameter of the deliver sheath should be designed so that, in an interventional clinical process, the delivery sheath loaded with the stent can successfully convey the stent to the pre-designated position of the lesion. (3) The delivery sheath has certain pushing performance and resistance to breaking to ensure that the stent can be successfully conveyed to the pre-designated position of the lesion without fracture or breakage. (4) The delivery sheath should have resistance to stretching to a certain extent. Since there is a certain release resistance in the stent releasing process, the resistance to stretching to a certain extent of the delivery sheath may avoid the risk that the stent fails in being released from the sheath after the sheath stretches under a relatively high pull force due to an extremely high release force of the stent. (5) The delivery sheath can or cannot be successfully withdrawn from the body after the stent has been released. It can be seen that whether the performance in all aspects of the delivery sheath is excellent or not plays an important role in the interventional treatment process using a vascular stent. For the conveyor of a stent-like product with a larger radial size after compression, the requirements on the inner and outer diameter are higher. First, the inner diameter must be large enough to carry apparatuses such as compressed stents. In addition, in order to ensure that the conveyor enters the blood vessel successfully, when the inner diameter of the delivery sheath is kept unchanged, a smaller outer diameter of the delivery sheath is better, which will inevitably lead to a smaller wall thickness of the delivery sheath. However, for the delivery sheath with a smaller wall thickness, its pushing performance and resistance to breaking and stretching will be reduced, which may adversely affect the smooth operation of interventional surgery. SUMMARY Based on this, it is necessary to provide a conveyor. A conveying sheath or delivery sheath of the conveyor has a moderate inner diameter and outer diameter and has good pushing performance and good resistance to breaking and stretching. A conveyor includes a sheath core tube, a delivery sheath and an operating handle. The proximal end of the sheath core tube and the proximal end of the delivery sheath are both connected to the operating handle. The delivery sheath and the sheath core tube are both a hollow tube. The delivery sheath is sleeved on the sheath core tube in an axially slidable manner, and the delivery sheath and the sheath core tube form a storable cavity. The delivery sheath includes a loading portion, a pushing portion and a connecting portion. The proximal end of the loading portion is connected to the distal end of the pushing portion; the proximal end of the pushing portion is connected to the distal end of the connecting portion, and the proximal end of the connecting portion is connected to the operating handle. The inner diameter of the loading portion is 0.05-1 mm larger than that of the pushing portion, and the outer diameter of the loading portion is equal to that of the pushing portion. The ratio of the axial length of the loading portion to the total length of the delivery sheath is in a range from 1% to 5%. In one embodiment, the pushing portion includes a first region and a second region axially connected to the first region; the wall thickness of the second region is constant, and the inner diameter of the loading portion is 0.05 to 1 mm larger than that of the second region; the distal end of the first region is connected to the proximal end of the loading portion; and from the distal end to the proximal end of the first region, the wall thickness of the first region gradually increases from a numerical value equal to the wall thickness of the loading portion