CN-109984877-B - Lumen stent system

CN109984877BCN 109984877 BCN109984877 BCN 109984877BCN-109984877-B

Abstract

A lumen stent system comprises a lumen stent and a conveying device, wherein the conveying device comprises a sheath tube, a push tube, an inner core tube, a first anchoring piece and a second anchoring piece, the push tube is arranged in the sheath tube in a penetrating mode, the inner core tube penetrates through the push tube and stretches out of the sheath tube, the first anchoring piece is arranged at the distal end of the inner core tube, the second anchoring piece is at least partially arranged at the distal end of the push tube, the first anchoring piece and the second anchoring piece are respectively connected with the distal end and the proximal end of the lumen stent to respectively provide first axial acting force and second axial acting force with opposite directions, so that the lumen stent is loaded in a cavity surrounded by the inner core tube and the sheath tube, when the sheath tube moves to be parallel to the distal end of the push tube along the axial direction of the inner core tube, the distal end of the lumen stent is connected with the first anchoring piece, and the proximal end of the lumen stent is connected with the second anchoring piece, and the outer diameter of the lumen stent is at least less than 90% of the outer diameter of the lumen stent in a natural state. The lumen stent system can accurately control the release position of the lumen stent.

Inventors

XIAO BENHAO
WANG QIN

Assignees

先健科技(深圳)有限公司
先健科技(深圳)有限公司

Dates

Publication Date: 20260421
Application Date: 20171228
Priority Date: 20171228

Claims (12)

1. The lumen stent system comprises a lumen stent and a delivery device for delivering the lumen stent, wherein the delivery device comprises a sheath tube, a push tube, an inner core tube, a first anchoring piece and a second anchoring piece, the push tube penetrates through the sheath tube, the inner core tube stretches out of the sheath tube, the first anchoring piece is arranged at the distal end of the inner core tube, the second anchoring piece is at least partially arranged at the distal end of the push tube, the delivery device is characterized in that the first anchoring piece comprises at least two anchoring rods, one end of each anchoring rod is connected with the inner core tube, the other end of each anchoring rod axially extends towards the distal end of the inner core tube and is suspended, the suspended end of each anchoring rod is hooked and connected with the distal end of the lumen stent to provide a first axial acting force on the lumen stent, the second anchoring piece is connected with the proximal end of the lumen stent to provide a second axial acting force on the lumen stent, the second anchoring piece is at least partially arranged at the distal end of the push tube, and the second anchoring rod is positioned at least flush with the outer diameter of the sheath tube, and the suspended end of the lumen stent can be kept flush with the outer diameter of the lumen stent, and the suspended end of the lumen stent is kept at least one end of the lumen stent, and the suspended end is kept flush with the outer diameter of the lumen stent, and the tubular stent is kept at least one axial acting force is kept at 90.
2. The lumen stent system of claim 1, wherein the first anchor further comprises a securing sleeve, the securing sleeve being disposed over the inner core tube, an end of the anchor rod distal from the suspended end being disposed over the securing sleeve to connect the anchor rod with the inner core tube.
3. The lumen stent system according to claim 1, wherein when the lumen stent is accommodated in a cavity surrounded by the inner core tube and the sheath tube, an outer diameter of the lumen stent is R1, when the sheath tube is moved axially along the inner core tube to a state where a distal end of the sheath tube is flush with a distal end of the push tube, an outer diameter of the lumen stent is R2, a loading length of the lumen stent is L1, a length of the lumen stent in a half-release state is L2, and the L1, L2, R1, and R2 satisfy the following relationship: l1—l2=μ (R1-R2), where μ is a constant less than 0 and the absolute value of μ is less than 1.
4. The luminal stent system of claim 3 wherein the luminal stent has a length L3 and an outer diameter R3 when the luminal stent is fully released, the L2, L3, R2 and R3 satisfying the relationship: L2—l3=γ (R2-R3), where γ is a constant less than 0 and the absolute value of γ is less than 1.
5. The luminal stent system of claim 4, wherein R2 is less than or equal to 0.8R3.
6. The luminal stent system of claim 5, wherein r2= (0.6-0.8) x R3.
7. The lumen stent system according to claim 1, wherein a first developing unit is provided on the lumen stent, the first developing unit including at least one first developing mark, and when the number of the first developing marks is plural, the plural first developing marks are provided on the lumen stent at intervals in a circumferential direction.
8. The lumen stent system according to claim 7, wherein a second developing unit is further provided on the lumen stent, the first developing unit and the second developing unit are disposed at intervals in an axial direction, the second developing unit includes at least one second developing mark, and when the number of the second developing marks is plural, the plural second developing marks are disposed on the lumen stent at intervals in a circumferential direction.
9. The lumen stent system according to claim 1, wherein the second anchor comprises a collar member and at least two hook members, the collar member is sleeved on the inner core tube and a proximal end of the collar member is connected with a distal end of the push tube, one end of each of the hook members is disposed on the collar member, the other end is a free end, and each of the hook members has elasticity.
10. The lumen stent system of claim 1, wherein the delivery device further comprises an outer core tube passing through the push tube and the outer core tube being sleeved on the inner core tube, the second anchor comprises a collar and at least two anchors, the collar being sleeved on the outer core tube, one end of each of the anchors being disposed on the collar and the other end being a free end, and the anchors being closer to the distal end of the push tube than the collar.
11. The lumen stent system of claim 1, wherein the inner core tube is a stepped tubular structure comprising a first sub-tube of smaller diameter and a second sub-tube of larger diameter, a distal end of the second sub-tube being connected to a proximal end of the first sub-tube, the first anchor being disposed at a distal end of the first sub-tube.
12. The luminal stent system of claim 1, wherein the second anchor is at least one pull wire having one end passing through the push tube and tying the proximal end of the luminal stent by tying a knot, the other end of the pull wire being secured to the proximal end of the delivery device.

Description

Lumen stent system Technical Field The invention relates to the field of interventional medical instruments, in particular to a lumen stent system. Background At present, in the field of interventional medicine, the interventional operation of the compressible tube cavity stent becomes a main method for treating vascular stenosis, aneurysm and interlayer at present due to small treatment wound, less complications and good effect. The lumen stent is generally a compressible stent, the compressible stent is compressed into a hollow catheter, the stent compressed in the catheter is conveyed to a lesion part under the guidance of digital imaging equipment through a puncture of a human lumen, then the stent is separated from the constraint of the catheter in a certain way, and the stent is unfolded by virtue of the radial supporting force of the stent and is attached to the vessel wall, so that the aim of treating or slowing down the disease is fulfilled. In the prior art, the metal structure of the lumen stent is generally made of nickel-titanium alloy, and after being treated by a certain heat treatment forming process, the stent has the capability of recovering the shape of the stent (self-expanding stent). The current conveying device of the stent generally comprises at least one outer sheath tube for compressing the stent into the outer sheath tube, and a push rod, wherein the push rod is preloaded into the outer sheath tube, the distal end face of the push rod is clung to the proximal end of the stent and is used for pushing or ejecting the stent out of the outer sheath tube so as to achieve the purpose of releasing the stent. The method for conveying and releasing the self-expanding type lumen stent by adopting the conveying device generally comprises the following steps of 1 conveying a conveying system of the pre-assembled compression stent into a body under the guidance of a guide wire, 2 positioning the stent at a lesion position through a development mark point at the distal end of the stent, 3 fixing a push rod, retracting an outer sheath tube to release the stent, and expanding the stent by virtue of self rebound resilience to be attached to the inner wall of a blood vessel so as to achieve the aim of treatment. The method for delivering and releasing the lumen stent cannot adjust the release position of the stent after the sheath tube is retracted. For a lumen stent having a foreshortening property, it is foreshortened distally to proximally after it is released from the sheath, and thus it is difficult to precisely control the release position of the lumen stent. The existing lumen stent conveying device cannot accurately control the release position of the lumen stent because the position of the lumen stent cannot be adjusted secondarily after the lumen stent is released, so that clinical application requirements are difficult to meet, and particularly when a lesion blood vessel position of the release lumen stent has a plurality of branch blood vessels, the release position of the lumen stent is more required to be adjusted accurately. Disclosure of Invention Based on this, it is necessary to provide a lumen stent system that enables precise control of the release position of the lumen stent. A lumen stent system comprises a lumen stent and a delivery device for delivering the lumen stent, wherein the delivery device comprises a sheath tube, a push tube, an inner core tube, a first anchoring piece and a second anchoring piece, the push tube penetrates through the sheath tube, the inner core tube penetrates through the push tube and extends out of the sheath tube, the first anchoring piece is arranged at the distal end of the inner core tube, the second anchoring piece is at least partially arranged at the distal end of the push tube, the first anchoring piece is used for being connected with the distal end of the lumen stent so as to provide a first axial acting force for the lumen stent, the second anchoring piece is used for being connected with the proximal end of the lumen stent so as to provide a second axial acting force for the lumen stent, the first axial acting force is opposite to the second axial acting force, so that the lumen stent is loaded in a lumen surrounded by the inner core tube and the sheath tube, and when the sheath tube moves to the distal end of the inner core tube along the sheath tube, the second anchoring piece is at least partially arranged at the distal end of the push tube, and the second anchoring piece is kept flush with the distal end of the lumen stent, and the outer diameter of the lumen stent is kept to be at least equal to 90% of the outer diameter of the lumen stent. In the above lumen stent system, when the lumen stent is loaded in the delivery device, the distal end of the lumen stent is anchored by the first anchor, the proximal end of the lumen stent is anchored by the second anchor, when the delivery device delivers the lumen stent to the lesion site,