Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS 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
  • A61F2/00—Filters 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
  • A61F2/02—Prostheses implantable into the body
  • A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
  • A61F2/06—Blood vessels
  • A61F2/07—Stent-grafts
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS 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
  • A61F2/00—Filters 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
  • A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
  • A61F2/958—Inflatable balloons for placing stents or stent-grafts
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS 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
  • A61F2/00—Filters 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
  • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
  • A61F2/90—Stents 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
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS 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
  • A61F2/00—Filters 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
  • A61F2/02—Prostheses implantable into the body
  • A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
  • A61F2/06—Blood vessels
  • A61F2/07—Stent-grafts
  • A61F2002/072—Encapsulated stents, e.g. wire or whole stent embedded in lining

Definitions

• the present invention relates to a method for angioplasty of aneurysms, in particular of the aorta, for which the upper collar is short. It also relates to intraluminal prostheses for the implementation of this process, as well as balloons for the expansion of such prostheses.
• an expandable cylindrical prosthesis is introduced at the level of the aneurysm.
• This endoprosthesis is formed by an expandable reinforcement produced for example by a network of metallic wires, covered by a material ensuring sealing, for example DACRON (trade name) or PTFE.
• the prostheses of the anterior rt are well suited to situations where the upper collar is straight and sufficiently long.
• the contact surface of the endoprosthesis with the healthy vascular parts is then sufficient to avoid leaks (see FIG. 1).
• these prostheses of the prior art are ill-suited to situations where the collar is short, or oblique. In these cases, the connection between the endoprosthesis and the healthy vascular part is insufficient, and leaks can occur in particular at the level of the upper collar. These drawbacks tend to worsen over time, due to possible slippage of the prosthesis, or in the event of worsening of the aneurysm.
• the object of the invention is to remedy this drawback of prostheses of the prior art.
• the invention firstly relates to a process for angioplasty of vessels suffering from an aneurysm, consisting in introducing at the level of the aneurysm an endoprosthesis formed by an expandable frame covered with a sealing material, and to proceed with the expansion of said endoprosthesis after positioning at the level of the aneurysm using a balloon probe, characterized in that the endoprosthesis used has a beveled end positioned at the level of the collar, the plane frontal of the bevelled end so that the frontal plane is substantially perpendicular to the aortic axis into which the endoprosthesis opens.
• the iliac endoprosthesis is expanded using a balloon configured to exhibit asymmetric swelling, advantageously using a shaped balloon. general cylindrical extended at one end a divergent part.
• the invention also relates to an endoprosthesis formed by an expandable frame covered by a sealing material for angioplasty of a vessel suffering from an aneurysm, characterized in that it has a cylindrical shape, one of the ends of which is bevelled in order to be positioned at the level of a short and / or oblique collar so that the frontal plane of the bevelled end is substantially perpendicular to the median axis of the inter-renal aorta.
• the beveled end has a frontal plane forming with the median axis an angle between 15 and 40 degrees.
• the invention further relates to a balloon for expanding a stent configured to exhibit asymmetric swelling.
• the balloon according to the invention has a generally cylindrical shape extended at one end by a divergent part.
• it has a flared reinforced end. According to another variant, it has a conical end.
• - Figure 2 shows a sectional view of such a solution, for cases where the collar is oblique;
• - Figure 3 shows a sectional view of an aneurysm with an endoprosthesis according to the invention.
• FIG. 4 shows a sectional view of a bifurcated endoprosthesis implanted at the iliac level during expansion with a balloon of the prior art
• FIG. 5 shows a sectional view of a stent being expanded with a balloon according to one invention
• FIG. 6 shows a sectional view of a stent being expanded with a balloon according to a variant of one invention
• FIG. 7 shows a sectional view of a stent being expanded with a balloon according to another variant of the invention.
• the prosthesis (1) is formed by an expandable tubular section in its upper part. It has an expandable steel frame for example, embedded in a tubular PTFE envelope ensuring sealing.
• the endoprosthesis (1) is brought through the aorta into the aneurysm (2), one of the ends (4) of the prosthesis being positioned in the collar (6) just below the renal arteries (3), and the other end (5) being positioned above the aortic bifurcation (7).
• the endoprosthesis (1) is expanded by pressurizing a balloon.
• the balloon is then removed, leaving
• Figure 3 shows a sectional view of a stent according to the invention.
• the end (4) of one endoprosthesis (1) is bevelled to provide better coverage of the outer wall of the curvature and improve the attachment to the collar. Leaks are therefore reduced.
• the axis (20) of the neck of the aneurysm is not always in the extension of the median axis (11) of the inter-renal aorta. Often these two axes form an angle of a few degrees between them.
• the object of the invention is to compensate for this angle by a beveled end at an angle such as the frontal plane (10) is perpendicular not to the median axis (20) of the collar, and therefore of the endoprosthesis, but to the median axis (11) of the suprarenal aorta.
• the frontal plane (10) of the end of the endoprosthesis is perpendicular to the median axis (11) of the inter-renal aorta (6), or more precisely to the tangent of the midline of said collar (6) and forms an angle of about 30 ° with the longitudinal axis of the endoprosthesis.
• Figures 4 and following relate to
• Figure 4 shows a sectional view of a stent being expanded with a balloon of the prior art. It is found that used with a stent with beveled end, such a balloon (15) does not allow satisfactory deployment of the beveled end (16). The balloon deforms for lack of support on the bevelled part (16), and causes a parasitic curvature of the end of one endoprosthesis.
• FIG. 5 and 6 show sectional views of a stent being expanded with a balloon according to the invention by resting on the wall of the iliac artery opposite the treated iliac artery.
• This balloon has a cylindrical part (17) extended by a flared part (18) of conical shape.
• This flared part ensures optimal expansion of the beveled end of the endoprosthesis.
• the balloon can be armed as shown in FIG. 5 or unarmed as shown in FIG. 6.
• FIG. 7 represents a sectional view of an endoprosthesis during expansion with a balloon according to another variant of the invention.
• the flared part (18) is spherical in shape and provides good support on the inner walls of one beveled end (16).

Landscapes

• Health & Medical Sciences (AREA)
• Engineering & Computer Science (AREA)
• Biomedical Technology (AREA)
• Life Sciences & Earth Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Transplantation (AREA)
• Heart & Thoracic Surgery (AREA)
• Vascular Medicine (AREA)
• Cardiology (AREA)
• Animal Behavior & Ethology (AREA)
• Oral & Maxillofacial Surgery (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Gastroenterology & Hepatology (AREA)
• Pulmonology (AREA)
• Prostheses (AREA)
• Media Introduction/Drainage Providing Device (AREA)
• Materials For Medical Uses (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Related Child Applications (1)

Publications (1)

Family

ID=9511291

Family Applications (1)

Country Status (8)

Cited By (2)

Families Citing this family (7)

Citations (2)

Family Cites Families (7)

• 1997
  • 1997-09-19 FR FR9711719A patent/FR2768611B1/fr not_active Expired - Fee Related
• 1998
  • 1998-09-21 JP JP2000512479A patent/JP4057780B2/ja not_active Expired - Fee Related
  • 1998-09-21 ES ES98945340T patent/ES2194349T3/es not_active Expired - Lifetime
  • 1998-09-21 AT AT98945340T patent/ATE233073T1/de not_active IP Right Cessation
  • 1998-09-21 EP EP98945340A patent/EP1014890B1/fr not_active Expired - Lifetime
  • 1998-09-21 WO PCT/FR1998/002014 patent/WO1999015102A1/fr not_active Ceased
  • 1998-09-21 DE DE69811692T patent/DE69811692T2/de not_active Expired - Lifetime
• 2000
  • 2000-03-17 US US09/528,084 patent/US6524337B1/en not_active Expired - Fee Related

Patent Citations (2)

Also Published As

Similar Documents

Legal Events