RU167983U1 - Intravascular Remediable Stent - Google Patents

Intravascular Remediable Stent Download PDF

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Publication number
RU167983U1
RU167983U1 RU2016121660U RU2016121660U RU167983U1 RU 167983 U1 RU167983 U1 RU 167983U1 RU 2016121660 U RU2016121660 U RU 2016121660U RU 2016121660 U RU2016121660 U RU 2016121660U RU 167983 U1 RU167983 U1 RU 167983U1
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RU
Russia
Prior art keywords
elements
stent
shaped
slots
shaped elements
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RU2016121660U
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Russian (ru)
Inventor
Роберт Вениаминович Гольдштейн
Николай Михайлович Осипенко
Александр Васильевич Ченцов
Original Assignee
Федеральное государственное бюджетное учреждение науки Институт проблем механики им. А.Ю. Ишлинского Российской академии наук (ИПМех РАН)
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Application filed by Федеральное государственное бюджетное учреждение науки Институт проблем механики им. А.Ю. Ишлинского Российской академии наук (ИПМех РАН) filed Critical Федеральное государственное бюджетное учреждение науки Институт проблем механики им. А.Ю. Ишлинского Российской академии наук (ИПМех РАН)
Priority to RU2016121660U priority Critical patent/RU167983U1/en
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Publication of RU167983U1 publication Critical patent/RU167983U1/en

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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes

Abstract

The utility model relates to medical equipment, namely to expandable medical implants to maintain the lumen in the vessels. The technical result is to increase the stability of the form under the action of radial compression. This is achieved by the intravascular expandable stent containing a flexible tubular body made in the form of interconnected closed contour elements adjacent to each other in the direction of the circle and along the longitudinal axis, while the elements in the direction of the circle are formed by circular arcs, each from the ends of which ends with V-shaped elements. Moreover, inside the V-shaped elements, V-shaped through-slots are made, the outer walls of the slots are made thicker, while one end of the circular arcs is connected to the outer walls of the V-shaped slots, and the other to the inner, all the vertices of the V-shaped elements in each row are directed one way, and in adjacent rows towards each other. The contour elements are closed using lamellas directed along the longitudinal axis of the stent, connecting through one V-shaped elements in adjacent rows. 4 ill.

Description

The utility model relates to medical equipment, namely to expandable medical implants to maintain a lumen in the vessels.

Known expandable inside the lumen of the stent (RU 2175531 [1]). The stent includes a flexible tubular body with a longitudinal axis, the wall of which is formed by two closed frame elements adjacent to each other in the circumferential direction. The material of the frame is in the form of threads. The compressive forces in the axial direction of the filaments are transmitted from one frame element to another, following in the longitudinal direction. The stent can expand from a radially compressed state to a state having a larger diameter. The disadvantage of the stent is that its length decreases when expanded and it has a relatively low flexibility.

Known intravascular expandable stent (RU 2257180 [2]), which contains a flexible tubular body with a longitudinal axis. The walls of the housing are formed by mutually connected closed elements of the frame, located with at least two elements adjacent to each other in the direction of the circle. The frame elements are capable of transmitting compressive forces in the axial direction and transmit pressure continuously from one frame element directly to the frame element following in the longitudinal direction. The sides of the frame include at least two elongated, mutually converging first sides of the element. The stent can expand from a radially compressed state to a state having a larger diameter. The first angle between the first sides of the element and facing the element and the second angle between the second sides of the element and facing the element have fixed values. The housing is made of a tube or piece of plate in which the holes of the element are profiled.

The calculations showed that with an increase in the diameter of the stent, its length decreases, which makes it difficult to choose the required size (initial length) of the stent and the accuracy of its location inside the vessel, and it also has insufficient flexibility in use.

Known intravascular expandable stent, which practically does not change its length when expanded (RU 2350301 [3]). The stent contains a flexible tubular body with a longitudinal axis, the wall of which is formed by mutually connected closed frame elements located with at least two elements adjacent to each other in a circumferential direction. The frame elements are made with an extendable shape, capable of transmitting compressive forces in the radial direction and transmitting pressure continuously from one frame element directly to the frame element, following in the longitudinal direction. The stent is arranged to expand from a radially compressed state to a state having a larger diameter, and the elements are interconnected by connecting links that are located between the mutually converging vertices of the closed frame elements with an elongated shape at an angle to a straight line parallel to the longitudinal axis of the stent and passing through the connection point links with an element of the frame, in the range from 0 to 30 °.

A disadvantage of the known stent is its relatively low reliability of maintaining the expanded shape when exposed to it. The main technology for installing biodegradable stents in a blood vessel at present is balloon technology, according to which the stent is squeezed onto the balloon and moved along the vessel to the desired location. After that, the balloon is inflated, the stent is expanded and pressed into the walls of the vessel, expands them, after which the pressure in the balloon is vented, the balloon is removed, and the stent, while maintaining the shape obtained during expansion, maintains the passage section of the vessel. For normal operation, the stent must satisfy some mechanical requirements. One of the main ones is the requirement of minimum rekomla (or “reverse”), i.e. reducing the diameter of the expanded stent after depressurizing and removing the balloon. Another requirement is radial stiffness and stent strength.

Maintaining the shape of the expanded stent (including the prototype) during depressurization and under the action of loads from the side of the vessel walls is ensured by inelastic deformations of its elements in the hinges that open when the stent is expanded. In working condition, under the action of radial compression from the side of the vessel walls and perceived by arcs connected through hinges, the latter tend to close, returning the system to its original compressed state. Counteracting this is only residual inelastic deformation that develops in the hinge region when the stent extends during installation. This counteraction may not be sufficient for the successful operation of the stent, in particular made of a biopolymer, including due to a decrease in the local polymer strength in the hinge region when they are expanded.

Known expandable intravascular expandable stent containing a flexible tubular body with a longitudinal axis, the wall of which is formed by mutually connected closed frame elements (US 2002002400 [4]). Each closed element is formed by four arcs converging into nodes that act as hinges. The stent in the expanded state is resistant to external influences exerted on it by a blood vessel, but significantly changes its length, which makes it difficult to select the required size (initial length) of the stent and the accuracy of its location inside the vessel.

Closest to the claimed in its technical essence and architecture is a expandable intravascular stent, known from US 5695516 [4].

The expandable intravascular stent contains a flexible tubular body made in the form of interconnected closed contour elements adjacent to each other in the direction of the circle and along the longitudinal axis, while the elements in the direction of the circle are formed by circular arcs ending with V-shaped elements with outward peaks that connect to each other with the ends of the annular arcs of the adjacent row so that the side of the V-shaped element of the first annular arc is also the side of the V-shaped element of the second annular arc of bottom row. Thus, the circular arcs of adjacent rows are interconnected by the sides of the V-shaped elements directed by the vertices towards each other. As a result, the closed contour element of the stent when folded has the shape of a butterfly, which in the expanded state takes the form of a hexagon. The known stent during expansion does not change its length, which is its undoubted advantage.

A disadvantage of the known stent is the relatively low reliability of maintaining the expanded shape with an external compressive effect on it from the side of the vessel walls, since in the expanded state, the stent is supported only by the presence of residual inelastic deformations at the joints of the arcs in which effective joints are formed during expansion.

The inventive expandable intravascular stent is aimed at increasing the stability of the form under the action of radial compression.

This result is achieved by the fact that the intravascular expandable stent contains a flexible tubular body made in the form of interconnected closed contour elements adjacent to each other in the circumferential direction and along the longitudinal axis, while the elements in the circumferential direction are formed by circular arcs, each of which ends ends with V-shaped elements. Moreover, inside the V-shaped elements, V-shaped through-slots are made, the outer walls of the slots are made thicker, while one end of the circular arcs is connected to the outer walls of the V-shaped slots, and the other to the inner, all the vertices of the V-shaped elements in each row are directed one way, and in adjacent rows towards each other. The contour elements are closed using lamellas directed along the longitudinal axis of the stent, connecting through one V-shaped elements in adjacent rows.

Distinctive features of the claimed device are:

- the implementation inside the V-shaped elements of the V-shaped through-slots;

- the implementation of the outer walls of the V-shaped slots thickened;

- some ends of the circular arcs are connected to the outer walls of the V-shaped slots, and others to the inner;

- all the vertices of the V-shaped elements in each row are directed in one direction;

- all the vertices of the V-shaped elements in adjacent rows - towards each other;

- closure of contour elements with the help of lamellas directed along the longitudinal axis, connecting through one V-shaped elements in adjacent rows. The execution of V-shaped through-cuts inside the V-shaped elements allows you to create a compact form of the stent in its original state (before expansion). The execution of the outer walls of the V-shaped slots in the V-shaped elements thickened is necessary in order to provide a supply of elastic energy necessary to maintain the stent in a straightened state.

The connection of the circular arcs so that some ends of the circular arcs are connected to the outer walls of the V-shaped slots, and the other to the internal, provides a hinged connection of the parts of the V-shaped elements.

The closure of the contour elements with the help of lamellas directed along the longitudinal axis of the stent connecting through one V-shaped elements in adjacent rows makes it possible to provide flexibility in connecting the contour elements with respect to the bending of the longitudinal axis of the stent.

The essence of the claimed expandable intravascular stent is illustrated by examples of its implementation and graphic materials. In FIG. Figure 1 shows a scan of the stent on a plane in the initial (compressed) state, where L is the length along the longitudinal axis, D is the stent circumference. In FIG. 2 shows a scan of a stent on a plane in a flattened state. In FIG. Figure 3 shows in large detail the node connecting the arcs to each other along the vertices of the V-shaped elements in the initial (compressed) state. In FIG. 4, an enlarged view shows the node connecting the arcs to each other along the vertices of the V-shaped elements in a straightened state.

The stent contains annular arcs 1, each end of which ends with V-shaped elements 2. Inside the V-shaped elements 2, V-shaped through-slots 3 are made. The outer walls 4 of said V-shaped elements are made thickened. The connection of the circular arcs to each other is carried out through V-shaped elements so that some ends of the circular arcs are connected to the outer walls of the V-shaped slots, and others to the inner ones. The closure of the contour elements is carried out using lamellas 5 directed along the longitudinal axis, connecting through one V-shaped elements in adjacent rows.

The stent is used as follows. In the initial (compressed) state (Fig. 1), the stent elements form a stable configuration that does not experience mechanical stress. When the stent is opened (under pressure from the side of the balloon located inside the stent) under tension from the side of the annular arcs 1 (in Fig. 3), the V-shaped slots 3 open. In this case, the inner walls of the V-shaped elements 2, turning around the closing points S (in Fig. 3) of the sides of the slots, acting as hinges, jump to a new stable position (Fig. 4). The elastic energy necessary for the stability of the new configuration of the V-shaped elements is provided by elastic deformation of the bracket of the outer walls 4 (in Fig. 3) when opening the V-shaped slots. The return of the stent to its initial compressed state is prevented by both inelastic deformation in the effective articulated joints of the elements and the need to overcome the elastic energy of the outer walls, which prevent the system from leaving the stable state.

Claims (1)

  1. An intravascular expandable stent containing a flexible tubular body made in the form of interconnected closed contour elements adjacent to each other in the direction of the circle and along the longitudinal axis, while the elements in the rows in the direction of the circle are formed by circular arcs, each of which ends in V- shaped elements, characterized in that inside the V-shaped elements are made V-shaped through slots, the outer walls of the slots are made thicker, while one end of the annular arcs is connected are connected with the outer walls of the V-shaped slots, and the others with the inner ones, all the vertices of the V-shaped elements in each row are directed in one direction, and in adjacent rows towards each other and contour elements are closed using lamellas directed along the longitudinal axis of the stent connecting through one V-shaped elements in adjacent rows.
RU2016121660U 2016-06-01 2016-06-01 Intravascular Remediable Stent RU167983U1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5695516A (en) * 1996-02-21 1997-12-09 Iso Stent, Inc. Longitudinally elongating balloon expandable stent
US5876449A (en) * 1995-04-01 1999-03-02 Variomed Ag Stent for the transluminal implantation in hollow organs
WO2000066034A1 (en) * 1999-05-03 2000-11-09 Drasler William J Intravascular hinge stent
US6331189B1 (en) * 1999-10-18 2001-12-18 Medtronic, Inc. Flexible medical stent
RU2253410C1 (en) * 2003-09-10 2005-06-10 Федеральное государственное унитарное предприятие "Научно-исследовательский институт электрофизической аппаратуры им. Д.В. Ефремова" Intravascular prosthesis for restoring and/or keeping the lumen of blood vessel (variants)

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5876449A (en) * 1995-04-01 1999-03-02 Variomed Ag Stent for the transluminal implantation in hollow organs
US5695516A (en) * 1996-02-21 1997-12-09 Iso Stent, Inc. Longitudinally elongating balloon expandable stent
WO2000066034A1 (en) * 1999-05-03 2000-11-09 Drasler William J Intravascular hinge stent
US6331189B1 (en) * 1999-10-18 2001-12-18 Medtronic, Inc. Flexible medical stent
RU2253410C1 (en) * 2003-09-10 2005-06-10 Федеральное государственное унитарное предприятие "Научно-исследовательский институт электрофизической аппаратуры им. Д.В. Ефремова" Intravascular prosthesis for restoring and/or keeping the lumen of blood vessel (variants)

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