CN210019820U

CN210019820U - Aortic stent conveying system with distal positioning and reverse releasing functions

Info

Publication number: CN210019820U
Application number: CN201822223942.2U
Authority: CN
Inventors: 张小明; 严心浩
Original assignee: Beijing Hong Hai Technology Development Co Ltd
Current assignee: Beijing Hong Hai Technology Development Co Ltd
Priority date: 2018-12-28
Filing date: 2018-12-28
Publication date: 2020-02-07
Anticipated expiration: 2028-12-28

Abstract

An aorta stent conveying system with the far-end positioning and reverse releasing function is characterized in that the right end of a conveyor leading-in head is fixedly connected with the left end of a stent protective sleeve, an aorta covered stent is arranged in the stent protective sleeve in a compressed mode, and the stent protective sleeve can be pushed into a conveyor outer sheath; the right end of the conveyor outer sheath tube is fixedly connected with the left end of the conveyor handle, the right end of the conveyor handle is provided with a conveyor release knob, the conveyor release knob is provided with internal threads, and an external thread push rod is in threaded connection with the internal threads of the conveyor release knob; the left end of the inner core pipe is fixedly connected with the leading-in head of the conveyor, and the right end of the inner core pipe sequentially penetrates through the aorta tectorial membrane support, the outer sheath pipe of the conveyor and the handle of the conveyor in the support protective sleeve and is fixedly connected with the left end of the external thread push rod in the release knob of the conveyor. The utility model realizes the distal positioning of the aorta covered stent and solves the problem of inaccurate distal positioning at present; the axial length of the far end of the stent has no retraction problem and is easy to release, withdraw and position.

Description

Aortic stent conveying system with distal positioning and reverse releasing functions

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to an aorta support conveying system of reverse release of distal end location.

Background

In recent years, the minimally invasive intracavity treatment technology of vascular surgery has made great progress, and the vascular stent is widely applied to the treatment of systemic vascular diseases at present. According to different lesion distributions, different vascular stents can be mainly applied to peripheral vascular lesions, arteriolar lesions, aortic lesions and the like; according to different pathologies, different vascular stents can be used for traumatic lesions of blood vessels, stenotic or restenotic lesions of blood vessels, etc. For aortic pathologies, such as aortic aneurysms and aortic dissections, aortic stent grafts are currently mainly used.

At present, the problem of inaccurate release and positioning of the stent at the far end exists in the release of the aorta including the thoracic aorta and the abdominal aorta in clinic, because the release of the aortic stent mostly adopts the mode that the stent is positioned at the near end and then the stent is pushed out of a conveying system by the head end of a conveyor to be released, namely the mode that the stent is released at the near end in a forward direction. After the proximal positioning of the aortic stent is released, the release position of the distal end of the stent is difficult to be accurately positioned at a preset position due to the length change (influenced by various factors) after the stent is released, so that the arterial branch is easily covered or the lesion position is not effectively isolated, and the problem of retraction of the distal end of the multi-section stent exists, which is caused by the structure of the stent and the push-out release mode.

Therefore, it is desirable to provide an aortic stent delivery system with distal positioning and reverse release, which can accurately cover an aneurysm or a dissection with an aortic stent while avoiding the occlusion of branches, and solve the problems of distal accurate positioning release and stent distal retraction of the aortic stent during clinical interventional therapy of the aneurysm.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides an aortic stent delivery system with reverse release of distal positioning, which solves the problems of inaccurate distal positioning and axial retraction of the distal end of the stent after the aortic stent is released in the prior art.

In order to solve the technical problem, the utility model adopts the following technical proposal:

an aorta stent conveying system with the far-end positioning and reverse releasing function comprises a conveyor leading-in head, a stent protective sleeve, an aorta tectorial membrane stent, a conveyor outer sheath tube, a conveyor handle, a conveyor releasing knob, an external thread push rod and an inner core tube; the right end of the leading-in head of the conveyor is fixedly connected with the left end of a stent protective sleeve, the aorta covered stent is compressed and arranged in the stent protective sleeve, and the stent protective sleeve can be pushed into the outer sheath of the conveyor; the right end of the conveyor outer sheath tube is fixedly connected with the left end of the conveyor handle, a conveyor release knob is arranged at the right end of the conveyor handle, an internal thread is arranged on the conveyor release knob, and the external thread push rod is in threaded connection with the internal thread of the conveyor release knob; the left end of the inner core pipe is fixedly connected with the leading-in head of the conveyor, and the right end of the inner core pipe sequentially penetrates through the aorta tectorial membrane support in the support protective sleeve, the outer sheath pipe of the conveyor and the handle of the conveyor to be fixedly connected with the left end of the external thread push rod in the release knob of the conveyor.

Preferably, the aorta covered stent comprises a metal stent and a stent covering membrane, and the stent covering membrane is covered on the outer surface or the inner surface of the metal stent. The structure not only retains the function of the metal bracket, but also has the characteristics of a membrane material.

Preferably, the aorta covered stent comprises a stent proximal end and a stent distal end, the stent distal end corresponds to the right end of the stent protective sleeve, the stent distal end of the aorta covered stent is exposed out of the right end of the stent protective sleeve, the stent distal end comprises a distal single section, the stent proximal end comprises a standard single section, and the length of the distal single section is greater than that of the standard single section. The structure ensures that the single section at the far end of the aorta covered stent does not axially retract towards the near end of the stent after the aorta covered stent is released.

Preferably, the number of the distal single sections is one, and the number of the standard single sections is more than three. The structure of a plurality of short standard single sections ensures that the aorta covered stent has good flexibility and good axial compliance, and can better conform to the bending of a blood vessel.

Preferably, the aorta covered stent has the length of 60mm-120mm and the diameter of 20mm-40mm, the length of the distal single section is 20mm-25mm, and the length of the standard single section is 8mm-10 mm.

Preferably, the metal stent is made of implantable materials such as stainless steel, cobalt-based alloy and/or nickel-titanium alloy, and the stent covering film is made of polytetrafluoroethylene or a polyester textile film.

Preferably, the right end of the external thread push rod is fixedly connected with a luer connector.

Preferably, the length of the conveyor sheath is 60cm to 120 cm.

When the aorta stent conveying system with the reverse release of the far end positioning is used, the two-step release method of the uncapped stent is realized, the aorta tectorial membrane stent is compressed and arranged in the stent protective sleeve, the far end of the stent is exposed out of the right end of the stent protective sleeve, the stent protective sleeve and the exposed far end of the stent are pushed into the outer sheath of the conveyor, the outer sheath of the conveyor and the handle of the conveyor are fixed after the aorta tectorial membrane stent is positioned, the external thread push rod is pushed leftwards through the conveyor release knob, the external thread push rod is pushed to drive the inner core pipe to move leftwards, the inner core pipe pushes the conveyor leading-in head and the support protective sleeve to move leftwards, the support protective sleeve and the exposed far end of the support are separated from the outer sheath pipe of the conveyor, the far end of the support of the aorta covered stent is separated from the constraint of the outer sheath pipe of the conveyor and is expanded, released and positioned on the wall of the aorta vessel, and the far end positioning of the aorta covered stent is achieved. The stent protective sleeve continues to move leftwards slowly, and the proximal end of the stent slowly falls out of the stent protective sleeve until the proximal end of the stent of the aorta covered stent completely falls out and releases under the action of friction between the distal end of the stent and the vessel wall, so that two-step release of the aorta covered stent and reverse release from the distal end to the proximal end are realized.

The utility model has the advantages as follows:

the aorta stent conveying system with the reverse release of the distal end positioning of the utility model adopts the technical proposal, realizes the distal end positioning of the aorta covered stent, and solves the problem of inaccurate distal end positioning of the aorta stent release at present; and the slow release of the aorta covered stent is realized, and inaccurate positioning caused by too fast release is avoided. The utility model discloses an aorta covered stent's distal end single section length is greater than the length of standard single section, and support distal end axial length does not exist and contracts the problem of returning, is released, withdraws and fixes a position easily, and has avoided distal end aneurysm or intermediate layer position to obtain the problem of effective coverage, or because of the multinode support returns the distal end aneurysm or the intermediate layer that select the multinode support of overlength to produce and covers the interference, the branch that causes covers the problem.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood and to make the technical means more comprehensible, and to make the above and other objects, technical features, and advantages of the present invention easier to understand, one or more preferred embodiments are listed below, and the following detailed description is given with reference to the accompanying drawings.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.

Fig. 1 is a schematic view showing the external structure of a conveyor of a distal positioning retrograde release aortic stent delivery system according to the present invention.

Fig. 2 is a schematic diagram of a partially sectioned structure of a distal positioning retrograde release aortic stent delivery system according to the present invention.

Fig. 3 is a schematic diagram of the aortic stent graft structure of the distal positioning retrograde release aortic stent delivery system of the present invention.

Description of the main reference numerals:

1-a conveyor leading-in head, 2-a support protective sleeve, 3-an aorta tectorial membrane support, 4-a conveyor outer sheath tube, 5-a conveyor handle, 6-a conveyor release knob, 7-a Ruhr joint, 8-an external thread push rod, 9-an inner core tube, 10-a support tectorial membrane, 11-a metal support, 12-a far end single joint and 13-a standard single joint.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited by the following detailed description.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

Spatially relative terms, such as "below," "lower," "upper," "above," "upper," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the object in use or operation in addition to the orientation depicted in the figures. For example, if the items in the figures are turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the elements or features. Thus, the exemplary term "below" can encompass both an orientation of below and above. The article may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative terms used herein should be interpreted accordingly.

As shown in fig. 1 and 2, the aorta stent delivery system with the distal positioning and the reverse releasing comprises a conveyor leading-in head 1, a stent pressure protection tube 2, an aorta covered stent 3, a conveyor sheath tube 4, a conveyor handle 5, a conveyor releasing knob 6, a luer connector 7, an external thread push rod 8 and an inner core tube 9.

The right end of the conveyor leading-in head 1 is fixedly connected with the left end of the stent protective sleeve 2, the aorta covered stent 3 is arranged in the stent protective sleeve 2 in a compressed mode, and the stent protective sleeve 2 can be pushed into a conveyor outer sheath tube 4; the right end of the conveyor outer sheath tube 4 is fixedly connected with the left end of a conveyor handle 5, a conveyor release knob 6 is arranged at the right end of the conveyor handle 5, internal threads are arranged on the conveyor release knob 6, and an external thread push rod 8 is in threaded connection with the internal threads of the conveyor release knob 6; the left end of the inner core tube 9 is fixedly connected with the conveyor leading-in head 1, and the right end of the inner core tube 9 sequentially penetrates through the aorta tectorial membrane support 3, the conveyor outer sheath tube 4 and the conveyor handle 5 in the support protective sleeve 2 and is fixedly connected with the left end of an external thread push rod 8 in the conveyor release knob 6. The right end of the external thread push rod 8 is fixedly connected with a luer connector 7.

As shown in fig. 3, the aorta covered stent 3 comprises a metal stent 11 and a stent covering membrane 10, and the stent covering membrane 10 covers the outer surface or the inner surface of the metal stent 11. The metal stent 11 is made of implantable materials such as stainless steel, cobalt-based alloy and/or nickel-titanium alloy, and the stent covering membrane 10 is made of polytetrafluoroethylene or a polyester textile film. This structure retains the function of the metal stent 11 and has the characteristics of a membranous material.

Aorta covered stent 3 includes support near-end and support distal end, the support distal end corresponds the right-hand member of support protective sleeve 2 and the support distal end of aorta covered stent 3 exposes the right-hand member of support protective sleeve 2, the support distal end includes distal end single-section 12, the quantity of distal end single-section 12 is one, the support near-end includes standard single-section 13, the quantity of standard single-section 13 is greater than three, the length of distal end single-section 12 is greater than the length of standard single-section 13. The structure ensures that the distal single section 12 does not axially retract towards the proximal end of the stent after the aorta covered stent 3 is released, and the structure of the plurality of short standard single sections 13 ensures that the aorta covered stent 3 has good flexibility and good axial compliance, and can better conform to the bending of blood vessels.

The aorta covered stent 3 is 60mm-120mm in length and 20mm-40mm in diameter, the distal single section 12 is 20mm-25mm in length, and the standard single section 13 is 8mm-10mm in length. The length of the conveyor sheath tube 4 is 60cm-120 cm.

When the utility model discloses an aorta stent conveying system of reverse release of distal end location, realized two steps of release methods of uncapped support, aorta tectorial membrane support 3 compresses to set up in support protective case 2 and the support distal end exposes in the right-hand member of support protective case 2, push support protective case 2 and the support distal end that exposes in conveyer outer sheath pipe 4, conveyer outer sheath pipe 4 and conveyer handle 5 are fixed after aorta tectorial membrane support 3 fixes a position, impel external screw thread push rod 8 left through conveyer release knob 6, impel external screw thread push rod 8 and drive inner core pipe 9 and move left, inner core pipe 9 impels conveyer leading-in head 1 and support protective case 2 to move left, support protective case 2 and the support distal end that exposes deviate from conveyer outer sheath pipe 4, the support distal end of aorta tectorial membrane support 3 takes off the constraint of outer sheath pipe 4 and expands the release location on aorta vascular wall, realizing the distal positioning of the aorta covered stent 3. The stent protection sleeve 2 continues to move leftwards slowly, and because of the effect of friction force between the distal end of the stent and the vessel wall, the proximal end of the stent slowly releases from the stent protection sleeve 2 until the proximal end of the stent of the aorta covered stent 3 completely releases, so that two-step release of the aorta covered stent 3 and reverse release from the distal end to the proximal end are realized, and inaccurate positioning caused by too-fast release is avoided. The utility model discloses a conveying system realizes the accurate location release back of 3 distal ends of aorta tectorial membrane support, and accessible tradition release system is near-end location conveyer again and releases tradition aorta tectorial membrane support 3 promptly, realizes the accurate support release of far-end near-end location.

The utility model discloses a distal end single section 12 length of aorta tectorial membrane support is greater than the length of standard single section 13, and support distal end axial length does not exist and contracts the problem of returning, is released, withdraws and fixes a position easily, and has avoided distal end aneurysm or intermediate layer position to obtain the problem of effective coverage, or because of the multinode support returns the distal end aneurysm or the intermediate layer that select the production of the multisection support of overlength to cover the interference, the branch that causes covers the problem.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. Any simple modifications, equivalent changes and modifications made to the above exemplary embodiments shall fall within the scope of the present invention.

Claims

1. An aorta stent conveying system with the far-end positioning and reverse releasing is characterized by comprising a conveyor leading-in head (1), a stent protective sleeve (2), an aorta tectorial membrane stent (3), a conveyor outer sheath tube (4), a conveyor handle (5), a conveyor releasing knob (6), an external thread push rod (8) and an inner core tube (9);

the right end of the conveyor leading-in head (1) is fixedly connected with the left end of the support protective sleeve (2), the aorta tectorial membrane support (3) is compressed and arranged in the support protective sleeve (2), and the support protective sleeve (2) can be pushed into the conveyor outer sheath tube (4);

the right end of the conveyor outer sheath tube (4) is fixedly connected with the left end of the conveyor handle (5), the right end of the conveyor handle (5) is provided with a conveyor release knob (6), the conveyor release knob (6) is provided with internal threads, and the external thread push rod (8) is in threaded connection with the internal threads of the conveyor release knob (6);

the left end of the inner core pipe (9) is fixedly connected with the conveyor leading-in head (1), and the right end of the inner core pipe (9) sequentially penetrates through the aorta tectorial membrane support (3), the conveyor outer sheath pipe (4) and the conveyor handle (5) in the support protective sleeve (2) and is fixedly connected with the left end of the external thread push rod (8) in the conveyor release knob (6).

2. A distal end positioning retrograde release aortic stent delivery system according to claim 1, wherein the aortic stent graft (3) comprises a metal stent (11) and a stent graft (10), and the stent graft (10) is coated on the outer surface or the inner surface of the metal stent (11).

3. A distal end positioning retrograde release aortic stent delivery system according to claim 2, wherein the aortic stent graft (3) comprises a proximal stent end and a distal stent end, the distal stent end corresponds to the right end of the stent protective sleeve (2) and the distal stent end of the aortic stent graft (3) exposes the right end of the stent protective sleeve (2), the distal stent end comprises a distal single segment (12), the proximal stent end comprises a standard single segment (13), and the length of the distal single segment (12) is greater than the length of the standard single segment (13).

4. A distal positioning retrograde release aortic stent delivery system according to claim 3, wherein the number of the distal single segments (12) is one, and the number of the standard single segments (13) is more than three.

5. A distal positioning retrograde release aortic stent delivery system according to claim 4, wherein the aortic stent graft (3) has a length of 60mm to 120mm and a diameter of 20mm to 40mm, the distal single segment (12) has a length of 20mm to 25mm, and the standard single segment (13) has a length of 8mm to 10 mm.

6. The aortic stent delivery system as set forth in claim 2, wherein the metallic stent (11) is made of stainless steel, cobalt-based alloy or nickel-titanium alloy, and the stent covering membrane (10) is made of polytetrafluoroethylene or dacron textile membrane.

7. A distal positioning retrograde release aortic stent delivery system as claimed in claim 1 wherein the right end of the externally threaded push rod (8) is fixedly connected with luer fitting (7).

8. A distal end positioning retrograde release aortic stent delivery system as claimed in claim 1, wherein the length of the conveyor sheath (4) is 60cm-120 cm.