WO1983000997A1 - Device for application in blood vessels or other difficultly accessible locations - Google Patents
Device for application in blood vessels or other difficultly accessible locations Download PDFInfo
- Publication number
- WO1983000997A1 WO1983000997A1 PCT/SE1982/000283 SE8200283W WO8300997A1 WO 1983000997 A1 WO1983000997 A1 WO 1983000997A1 SE 8200283 W SE8200283 W SE 8200283W WO 8300997 A1 WO8300997 A1 WO 8300997A1
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- WIPO (PCT)
- Prior art keywords
- spring
- state
- diameter
- length
- turns
- Prior art date
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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
- A61F2/01—Filters implantable into blood vessels
-
- 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
- A61F2/01—Filters implantable into blood vessels
- A61F2/0105—Open ended, i.e. legs gathered only at one side
-
- 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
- A61F2/82—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
- A61F2/88—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure the wire-like elements formed as helical or spiral coils
-
- 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
-
- 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
- A61F2/01—Filters implantable into blood vessels
- A61F2/011—Instruments for their placement or removal
-
- 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
- A61F2/01—Filters implantable into blood vessels
- A61F2002/016—Filters implantable into blood vessels made from wire-like elements
-
- 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
-
- 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
- A61F2002/075—Stent-grafts the stent being loosely attached to the graft material, e.g. by stitching
-
- 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
- A61F2002/9505—Instruments specially adapted for placement or removal of stents or stent-grafts having retaining means other than an outer sleeve, e.g. male-female connector between stent and instrument
- A61F2002/9511—Instruments specially adapted for placement or removal of stents or stent-grafts having retaining means other than an outer sleeve, e.g. male-female connector between stent and instrument the retaining means being filaments or wires
-
- 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
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2220/005—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using adhesives
-
- 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
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2220/0058—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements soldered or brazed or welded
-
- 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
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2220/0075—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable
-
- 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
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
- A61F2230/0004—Rounded shapes, e.g. with rounded corners
- A61F2230/0006—Rounded shapes, e.g. with rounded corners circular
-
- 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
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0063—Three-dimensional shapes
- A61F2230/0069—Three-dimensional shapes cylindrical
Definitions
- the present invention relates to a device which can be applied within for example blood vessels of the body of a living animal or a living human being.
- the device comprises a helically shaped coil spring that can be expanded from a first state of a certain diameter to a second state of larger diameter ana vice versa.
- the invention is particularly useful for mechanical transluminal implantation by means of an expanding, self-fixating appliance for blood vessels, respiratory tracts or the like.
- the inner walls of damaged blood vessels or other organs may be lined with artificial tissue which may be porous.
- the device according to the present invention may be used in many medicinal applications and, as examples, there may be mentioned utilization in different types of aneurism reflected by seme form of vessel widening, or the opposite, stenosis, which involves contraction of blood vessels. More particularly, the invention thus may be used to support and keep open vessels of venous systems, to support artificial vessel elements, to close pathological vessel failures, to bridge pathological vessel dilatations and ruptures in interior vessel walls or to stabilize bronchial tubes or bronchi.
- the device of the present invention may also be designed to act as a filter for thromboses, for example by application in Vena Cava Inferior to prevent the formation cf lung emboliae.
- the invention is not limited to the applications mentioned herein which must be considered as solely exemplifying.
- the present invention has for its purpose to provide for an expansible device whereby the drawbacks of the known technique are avoided.
- the present invention is based en the utilization of a device comprising a helically shaped coil spring which can be subjected to contraction or expansion.
- the invention is based on the principle that the spring will be given smaller or larger diameter by means of suitable mechanical means. This is possible to do in two principally different ways which all fall within the framework of the same basic inventive concept. In the following there are given examples of two of these ways.
- a first way consists in rotating the ends of the spring relative to each other while maintaining a constant length of the spring so that the transition from a smaller spring diameter to a larger one takes place by reducing the number of spring turns within said length and the corresponding increase of the pitch of the spring.
- a second way to change the diameter of the spring consists in removing part of the spring material from a given length of the spring at at least one end of the said length of the spring, so that the transition from a state of larger diameter to a state of smaller diameter takes place independent of pitch and number of spring turns within said length.
- the reverse operation is, of course, performed, i.e. additional spring material is supplied to the said length of the spring.
- This second way of changing the diameter of the spring may, if desirable, take place while maintaining pitch and number of spring turns within the said length.
- Both said ways may, of course, be used to change the coil spring from a state of larger diameter to a smaller diameter and vice versa.
- the larger diameter correspends largely to unloaded condition of the coil spring. This means that the contraction of the coil spring takes place against its spring resistance, whereas its expansion takes place under release of the tension to unleaded state.
- one end of the spring may be attached to a shaft which is centrally arranged inside the spring, whereas its other end is connected to a sleeve surrounding said shaft.
- the diameter of the spring can hereby be decreased or increased.
- the shaft and the sleeve can be removably connected to same.
- an axially extending guide bar can be arranged at the circumference of the spring, on which bar guide means are displaceably arranged through which the spring material can move tangentially in connection with the contraction or expansion of the spring.
- an axially extending support member can be arranged at the circumference of the spring which carries fixed guide means thrcugh which the spring material can move tangentially in connection with the expansion or contraction of the spring.
- a spring which over a limited part of its length has a larger density between the spring turns.
- This can in principle be done in two different ways.
- One alternative is based on distributing the above-mentioned fixed guide means in such a manner as to obtain over a certain length of the spring a larger density of turns.
- the second alternative consists in initially manufacturing the spring with one or several sections of higher turn density. Also a combination of these two alternatives may, of course, be used in practice.
- the spring material in a flattened form or in the form of a band, the larger dimension of the material as seen in cross section extending axially. It is particularly preferred to design the spring with an essentially rectangular cross section.
- a cylindrical tubular carrier body is arranged within the coil spring comprising a central part and being provided with end sections at the en ds of the spring pivotal relative to each other, the ends of the spring being connected to the respective end sections.
- the device furthermore includes means with the help of which the said end sections can be rotated relative to each other in order to expand or contract the spring.
- Said means for rotating the end sections suitably comprise a coaxial cable connected to the one end seeticn, the interior concentric element of the cable extending through the carrier body and being at the end connected to the other end section, rotators being arranged at the outer free end of the ccaxial cable for providing the desired relative movement between the end sections.
- the end sections of the carrier body may be axially displaeeable relative to the central part so that in the gap between the central part and the respective end sections the end of the spring can be relea ⁇ ably attached.
- it is suitable to arrange at least one end section or part thereof axially di ⁇ plac ⁇ able by means of a member arranged at the free end of the coaxial cable.
- the last-mentioned member may optionally perform the two-fold function of both to be used for rotating the second end section and providing for the axial displacement.
- an axially extending support member at the circumference of the spring, at the one end of which the spring is attached and at the other end of which there is provided a fixed guide member through which the spring material can move in ccnnection with the contraction or expansion of the spring.
- both ends of the support member there may be arranged fixed guide means, through which the material of the spring can move.
- This embodiment enables simultaneous feeding in both directions of spring material at both ends of the spring.
- the device of the invention comprises an elongated carrier body about which the spring is arranged, a cassette magazine arranged at one end of the carrier body including a cylindrie cassette housing, a feed cylinder eccentrically mounted therein which at its periphery engages the inside of the cassette housing, using this device the spring can be moved for contraction or expansion in the nip between the cassette housing and the feed cylinder by rotating the latter in one direction or the other.
- the cassette housing may be provided on the inside with a trapezoid thread in which the spring can glide.
- porous tissue In surgical operations for implanting prostheses it is sometimes desirable to provide for a porous tissue inside for example a blood vessel for some reason.
- a stocking of porous tissue outside or inside the spring which can be implanted at desired location together with the spring.
- the stocking may either by stretchability of the tissue or by overlapping folding be adjustable to the spring diameter in connection with the expansion of the spring.
- the coil spring which is critical in this respect.
- a medicinally acceptable material for example a stainless steel or ether metal alley or a plastic, used in similar connection.
- a further essential advantage of the technique of the present invention compared with for example that of the above-mentioned U.S. patent 3, 868,956 lies in the fact that the device according to the invention is reversibly operable, i.e. the spring may first after application be expanded, whereafter before releasing the spring from the other members cf the device one can check, for example by X-rays, that the position and fixation of the spring is acceptable, whereafter it can be released and the remaining part of the device removed from the location of application.
- This possibility is not at all available In the device according to the just mentioned U.S. patent, since the expansion initiated in this known technique is non-reversible.
- Fig. 1 shows a perspective view of a coil spring for use in the device according to the invention
- Fig. 2 shows a side view of the ceil spring containing a carrier body and showing the spring in expanded state;
- Fig. 3 shows the same device as Fig. 2 but showing the spring in contracted state
- Figs. 4-7 illustrate diagrammatically the principle of removing spring material from a coil spring in accordance with the invention
- Figs. 8 and 9 show a variant based on the same principle as that according to Figs. 4-7;
- Fig. 10 shows diagrammatically the possible performance of the ceil spring under the influence of external forces:
- Fig. II shows a detail of the coil spring using guide means
- Fig. 12 shows in enlargement a detail of the device of Fig. 11;
- Fig. 13 shows a detail section along line I-I in Fig. 12;
- Fig. 13A shows diagrammatically a spring provided with support member and a fixed guide member;
- Fig. 13E shews a detail of the embodiment of Fig. 13A;
- Fig. 14 shows diagrammatically a spring provided with support member and guide member
- Fig. 15 shows a detail of an alternative guide member
- Fig. 16 shows the guide member according to Fig. 15 seen from above;
- Fig. 17 shows diagrammatically an overall view of an embodiment of the device of the invention;
- FIG. 18 shews in overall view an alternative embodiment of the device according to the present invention
- Fig. 19 shows enlarged a detail of an alternative embodiment of the device of Fig. 18;
- Fig. 20 shows the detail according to Fig. 19 in side view
- Fig. 21 shows a device according to the invention for the application of porous tissue
- Fig. 22 shows an embodiment using a flat spring material with recesses
- Fig. 23 shows an embodiment designed as a ladder-like double spring:
- Figs. 24 and 25 show an embodiment of the coil enabling overlapping between adjacent turns;
- Fig. 26 shows a modified embodiment of the spring of the device, the spring providing for filtering function; and Fig. 27 shows an alternative embodiment where the spring has been covered with porous tissue.
- the device according to the invention is utilized in connection with a blood vessel containing a defect location, where the blood vessel has relatively large diameter, whereas the location where the device is introduced into the blood vessel has a smaller diameter.
- the device according to the present invention may be used, also in cases where it shall be inserted in a blood vessel of a relatively constant diameter thereby to avoid damages to the inner walls of the blood vessel in connection with inserting the device for transfer to the location where application shall take place.
- the device according to the invention can be inserted at an easily accessible location where the blood vessel in question has a relatively small diameter due to the fact that the coil spring of the device can he maintained in contracted state by mechanical means, said state being small or smaller than the diameter of the blood vessel at the location of insertion.
- the device including the coil spring is then inserted into the blood vessel and transferred to the defective location where the coll spring in a mechanical manner is expanded until the cuter diameter of the spring is equal to or somewhat larger than the diameter of the blood vessel at the defective location.
- the coil spring is suitably released from the other members of the device acccrding to the invention and may after removal of the remaining part of the device thus be left at the defective location for carrying out its supporting function from the inside.
- the spring in unloaded state is selected somewhat larger than the inner diameter of the blood vessel the spring will fixedly engage the walls of the vessel by a certain specific pressure the magnitude of which can be precalculated and thus selected as desired.
- FIG. 1 shows diagrammatically a coil spring having diagrammatically shown longitudinal axis 2.
- the ends of the spring are designated 3 and 4.
- the ceil spring of Fig. 1 is assumed to be in a position of rest, i.e. It has taken the shape it has when not effected by external forces. If now the ends 3, 4 of the spring are rotated around the longitudinal axis 2 in the direction of arrows 5, 6 under the influence of an external force the spring diameter will decrease at the same time as the number of turns increase in a corresponding degree.
- Fig. 2 there is.
- a coil spring 1 in position of rest as seen in a side view.
- the same spring 1 is shown after reduction of the diameter has been provided for in accord with the description relative to Fig. 1.
- spring 1 In its position in Fig. 3 spring 1 has been given a diameter d3 which is one third of the diameter d2 of Fig. 2, whereas the number of turns i ⁇ three times as large as the number of turns in position of rest. Since the length L cf the spring is maintained unchanged the pitch s3 of the helical spring in the position according to Fig. 3 is one third of the pitch s2 of the position of rest according to Fig. 2.
- Figs. 2 and 3 there is shown with dashed lines a cylindric central body 7 having for a function to stabilize the spring 1 in its contracted condition acc. to Fig. 3.
- Figs. 4-7 there is shown the principle for another embodiment acc. to the invention, according to which the diameter change of the coil spring is provided without changing the pitch of the spring.
- a ceil spring 1 is acc. to Fig. 4 in its position of rest with diameter b4, length L4 and pitch s4.
- Fig. 5 the same spring is shown but having the diameter d5 reduced to about half of the diameter d4 according to Fig. 4. However, in this state the spring has two parts A and E of different pitch.
- Fart A has the same length L4 and pitch ⁇ 4 as the spring has in position of rest, whereas part E has a length L5 which is considerably smaller than L4 and a pitch s5 which is considerably smaller than s4.
- the reduction of the diameter from the position of rest according to Fig. 4 to the state according to Fig. 5 can be provided by rotating the ends of the spring in the same manner as shown in Figs. 1-3.
- Dividing up the contracted spring in two zones of different pitches can thus be provided by means of ⁇ uitable mechanical aids.
- Fig. 6 there i ⁇ shown the same spring 1 as in Fig. 4 but having a diameter d6 which has been reduced to about half of diameter d4.
- the spring has two parts C and D.
- Part C has the same length L4 and pitch s4 as the spring has in its position of rest.
- part D spring 1 forms a concentric flat spiral spring.
- Fig. 7 there is shown the spiral spring ace. to Fig. 6 but in an end view, from which the appearance of part D is clear.
- the total length IA of the spring and the pitch s4 Is thus the same as In the position of rest of the ⁇ pring.
- the change of spring 1 from po ⁇ iticn of rest to the state according to Figs. 6 and 7 can be provided by using suitable mechanical devices.
- Figs. 1-7 there has thus been shown how the diameter cf helically shaped coil springs according to the invention can be changed to enable for example surgical operations.
- Figs. 1-7 there will be described some different practical solutions to provide fcr the desired expansion or contraction of the coil spring.
- Part 33 of the embodiment according to Fig. 5 may also be considered as a storage part of the coil spring material from which in the expansion the part A of spring material is supplied.
- Figs. 8 and 9 there is shown a side view and an end view, respectively, of a device in which the just mentioned principle is applied. In the storage part B the spiral turns lie close to each other.
- Figs. 8 and 9 show diagrammatically how the feeding can take place through a nip formed between two counter-rotating small feeding rollers 15 and 16, whereby spiral material is progressively and controlled fed cut at the end 17 of the roller nip in the direction of arrow 18.
- the dashed line 19 in Figs. 8 and 9 shows part A of the coil spring after expansion to position rest has taken place.
- the spring may before, during and after the expansion be axially compressed in order to then be axially extended to for example neutral unloaded state and even to an expanded state beyond neutral. This later case may result in certain further stabilization of the spring in view of tension stored therein.
- the diameter of the coil spring in contracted or reduced state is suitably not larger than 8 to 10 mm.
- the diameter in expanded state may lie between 12 and 30 mm.
- this thread material it is not possible to manufacture a coil spring which in its position of rest in expanded state has a diameter of about 30 mm. Investigations have shown that for all spring materials of interest there is a relation between material thickness and expansion number.
- a coil spring based on such material gives satisfactory support when applied in for example a defective blood vessel.
- coil springs made of thin material have, a tendency in expanded state to be mechanically instabie. Thus, this results in tilting or collapse of the spring after its application.
- Fig. 10 there is shown diagrammatically how a coil spring 1 made of a thin material can perform in view of instability- in expanded position after it has been applied.
- the cashed line indicates the vessel wall of a blood vessel wherein the spring has been expanded.
- Such instability of the coil spring is often not acceptable, since the coil spring does not perform its intended function to eliminate the said defect but can rather act restricting on the flow of blood.
- FIG. 11 shows diagrammatically part of a coil spring which in contracted state is designated 21 and in expanded state is designated 21a.
- guide member 22 for the coil spring are shown.
- Guide members 22 are arranged on a common flexible but relatively rigid thread 23 at a mutual distance of s12, as is clear from Fig. 11.
- Fig. 12 shows a detail of the device of Fig. 11 in enlargement and Fig. 13 shows a section along line I-I in Fig. 12.
- the coil spring 21 extends through a hole or a recess
- Fig. 13A shows an embodiment of a cell spring in expanded state stabilized by means of a fixed guide member.
- Ceil spring 21 which is suitably made of a thin metal band is as its end 25La fixedly attached to the axial support member 23a, suitably ccnsisting of one flexible band or two flexible bands attached to each to each other.
- the other end 21b of the coil spring 21 is connected to support member 23a by means of a single fixed guide member 22a in the form of a loop having a rectangular opening.
- spring 21 in this embodiment is sufficiently stable for practical use and that it is sufficient that the end sections of the spring are stabilized and connected to each other by means of support member 23a.
- the advantage of this embodiment containing one single guide member is that the expansion or contraction of the spring is facilitated by the fact that the spring need to pass only through one single guide member.
- Fig. 133 shows in enlargement a suitable design of guide member 22a and its connection to support member 23a.
- Guide member 22a is formed by using a band having a loop-like protrusion which, together with support member 23a, forms a rectangular recess 22a.
- said recess spring band 21 may easily slide while stabilized at the same time.
- the last descrlbed embodiment according to Figs. 13A and 13B can be modified by arranging a fixed guide member at each end of support member 23a.
- spring band material can be fed into or fed out from both ends of spring 21 simultaneously which can be of advantage at large expansion numbers when larger lengths of spring band material have to be stored at both ends of the spring in connection with the contraction of the spring.
- guide members 22 are, however, displaceably arranged on thread 23. whereby the pitch of the coil spring can be changed in accordance with what has been earlier described.
- Fig. 14 shows diagrammatically in a side view a coil spring thus stabilized in expanded rest position.
- the material of the coil spring suitably is in thread or band form, i.e. that the material of the coil spring in an axial cross section has a round or flattened shape.
- coil springs made of band-formed material are more ⁇ table and have less tendency to tilt or collapse.
- the band width should not exe ⁇ d 1 to 1.5 mm for medicinal reasons. Larger width hampers the growth of tissue and results in inferior fixation in view cf lower specific engagement pressure.
- High specific engagement pressure is to prefer since it gives a better fixation which is essential in applications In blood vessels, where the pulse rhythm can result in displacement of an applied ⁇ pring in an axial direction.
- One way of improving fixation is to coarsen the outer surface of the spring material by for example blastering.
- the spring material may also by punching be provided with outwardly extending protrusions or, alternatively, the band material can be perforated, for example by punching or by using a laser, whereby better fixation will be obtained and the growth of tissue in the area where the spring has been applied is facilitated.
- Fig. 15 shows in enlargement an embodiment of a guide member providing for good spring stability also at large expansion numbers.
- Guide member 27 is provided with a rectangular recess 23 for guiding a band-formed coil spring 29, as shown in cross section.
- the dimensions of recess 25 are suitably selected so that the coil spring member 29 can easily slide through the recess when the spring is expanded or contracted. At the same time it is prevented that the coil spring tilts so that the tilting forces are taken up by the guide member and the associated thread arranged in hole 25.
- Fig. 16 shows a corresponding guide member 30 but seen from above.
- the dashed lines 31 indicate a recess of rectangular cross section, and the dashed lines 32 correspond to hole 25 of Fig. 15.
- the center lines 33 and 34 respectively, cross each other with an angle different from 90o.
- the guide member can be adjusted to the pitch angle of the coil spring in relation to the thread and in this manner the movement of the coil spring when changing the diameter of the spring will be facilitated.
- Fig. 17 shows an embodiment of the device according to the present invention in the form of an instrument 35 for performing surgical operations.
- a coil spring 36 is in contracted state arranged about a cylindric carrier body 37.
- This body is provided with a tubular central part 47 and end ⁇ ections 40, 41, which by a rotary ring 45 are rotatable relative to each other and also axially displaceable in relation to the central part 47.
- a flexible coaxial cable 42 is connected to one end section 41.
- This coaxial cable 42 contains an cuter tubular part 42b an inner element 42a concentrically arranged extending through ⁇ nd section 41 and the central part 47 of carrier body 37 all the way up to the second end section 40, to which it is securely attached.
- nob members 43, 44 At the free outer end of coaxial cable 42 there are arranged nob members 43, 44, of which one nob member 43 is connected to the outer part 42b of the coaxial cable, whereas the ether nob member 44 is connected to the Inner element 42a of the coaxial cable.
- One end 38 of coil spring 36 can be clamped in a slit 46 arranged between the central part 47 of the carrier body and the end section 40 by the axial displacement of the latter.
- the other end 39 of coil spring 36 is in a corresponding manner clampable in a slit 48 between end section 41 and rotary ring 45, also this in view of the axial displacement of end section 41.
- Th ⁇ clamping of ends 38, 39 of coil spring 36 in slits 46 and 48, respectively, as well as the release of the ends from the slits can be provided by axial displacement of the inner element 49 of the coaxial cable 42 by manoeuvring nob member 44 which also operates for providing the axial displacement.
- Rotating both ends 38, 39 of coil spring 36 in relation to each other in accordance with the principle illustrated in Figs. 1-3 can be provid ⁇ d by rotating nob members 43, 44 relative to each other.
- a central through-going passage 49 is arranged by means of which contrast liquid, other instruments for medicinal investigation can be inserted into the blood vessel.
- the function of the device shown is briefly as follows. In the state shown in Fig. 17. i.e. with coil spring 36 contracted, carrier body 37 with coil spring 36 attached in the respective slits 46, 48 is inserted through an easily accessible location on the blood vessel in question and fast en to the defective position of larger diameter.
- the expansion of coil spring 36 is provided by rotating nob means 43, 44 in relation to each other.
- Fig. 18 there is shown an alternative embodiment of the device according to the invention in the form of an instrument generally designated 51 for carrying out surgical operations.
- the device is based upon the spring principle in accordance with that shown in Fig. 5 and in connection to the embodiment shown in Figs. 13A and 133.
- spring 52 is shown in contracted state.
- the axially extending support means 53 of the spring is securely attached to one end 54 of spring 52, whereas the spring at its other end is movable through a guide member 55 arranged on support member 53.
- Spring 52 and support member 53 are attached to a cylindric elastic and hollow body 56 by means of latches not shown In the figure, one at each end of support means 53.
- the latches can be released from the ends of support member 53 by means of for example a wire for each extending within hollow body 56 and a coaxial cable 57 connected thereto and can in this manner be controlled from the outside.
- the spring is wound about carrier body 56 with relatively elo ⁇ windings 58.
- the end 62 of spring 52 adjacent to the coaxial cable is releasably connected to a sleeve 59.
- the sleeve surrounds the cylinder carrier body 56 and can be rotated and axially moved by means of a flexible tube which is concentrically arranged in the coaxial cable 57.
- the expansion of spring 52 is provided by rotatlng sleeve 59, the spring excess stored adjacent to the sleeve expanding simultaneously with spring 52 moving through guide means 55. During the expansion the sleeve is slowly brought forward by the axial movement of the flexible tube. The total length of spring 52 has been adjusted in advance so that when the expansion is interrupted by the surrounding inner walls of the blood vessel only a minor length of spring material is found outside guide member 55. When the surgeon ha ⁇ checked that the spring has taken its correct position spring 52 with carrier member 53 will be released by releasing the said latches and the attachment of end 60.
- the excess 53 of the spring which has been exteriorly wound about body 56 in close windings may, according to another embodiment of the invention, be interiorly ⁇ tored in a sleeve and by means of suitable members be fed out from said sleeve through guide m ⁇ mb ⁇ r 55 (Fig 18).
- This embodiment is shown in Figs. 19 and 20 in axial and radial section, res ⁇ ectively.
- a feed cylinder 63 is eccentrically mounted in a cylindric housing 61.
- cams 66 are cut to form an interior trap ⁇ zoid thread 67.
- Feed cylinder 63 is exteriorly covered by a rubber layer 64.
- the band material 72 of the coil spring lies within trapezoid thread 67 and the rubber layer 64 arranged on the feed cylinder 63 is in pressing engagement against band material 72 along distance 68-69 (Fig. 20). If now feed cylinder 63 is rotated in the direction of arrow 71 spring band 72 will be advanced cut through guide member 55 (Fig. 18) with simultaneous expansion of the spring. In view of the fact that feed cylinder 63 having rubber layer 64 engages interiorly along the whole length of trapezoid thread 67 the spring band 72 may be retracted back into housing 61 if feed cylinder 63 is rotated in the opposite direction, the coil spring being subjected to contraction.
- Fig. 21 shows diagrammatically in a cross section a spring 21 in accordance with Fig. 13A in contracted state with support member 23A.
- a porous tissue in the form of a cylindric stocking 73 is arranged round the spring and attached to carrier member 23A by means of fine threads 24.
- the tissue is overlappingly folded double at folds 75 and 76 so as to closely enclose spring 21 in contracted state.
- Stocking 73 is held in this position by means of an axially extending thin metal wire 77 arranged in fold 75.
- metal wire 77 is removed whereupon spring 21 is brought to expand.
- spring 21 stocking 73 will be opened out and will, finally, be brought to firm engagement against the inner side of the damaged site of for example a blood vessel.
- the cylindrical stocking may, of course, be made of a stretchable material which, in connection to the expansion of the spring, can be stretched to an expanded state without using double folding of the material.
- Such material may for example be a round stitched or round knitted close meshed article, for example of the tricot type.
- Such alternative embodiment is, of course, particularly useful at lower expansion numbers, for example in such cases when the instrument with the spring in contracted state is inserted into a blood vessel of a relatively constant diameter but where nontheless certain contraction in relation to the inner diameter of the blood vessel is necessary in order to avoid damages to the inside of the blood vess ⁇ l in connection with inserting the instrument into the vessel.
- the housing described in Figs. 19-20 instead of the eccentrically mounted feed cylinder 63 may contain any suitable feed means by which the spring can be moved out from and into casing 61.
- any suitable feed means by which the spring can be moved out from and into casing 61.
- a concentrically arranged feed roller or a feed screw which is axially moved in connection with storing of the spring and thus after completed feeding of the spring will be rotated back into housing 61 before removal of the instrument from the site of application.
- the spring is made of a band-shaped material 78 which has be ⁇ n provided with elongated openings 79, for example by punching. In this manner the spring takes the shape of a ladder.
- Spring 78 which can be expanded in the same manner as the spring of Fig. 1 shows quite good stability and the risk for tilting of the spring in the manner shown in Fig. 10 has been eliminated.
- band thickness and width of the step iron-like remaining parts of the band the good stability can be combined with high expansibility from a small diameter to a large one.
- Fig. 23 a ladder-like ⁇ pring made from a round wire instead of from a flat band.
- the spring has been manufactured by initially producing a ladder by attachment of two adjacent parallel wires 80 and 81 by means of transverse elements 82.
- This device may also be regarded to be a double spring composed of two single springs 80 and 81.
- Fig.23 there is shown an arrangement whereby such tissue can be introduced into a damaged organ. Even if the arrangement illustrated in connection to the particular spring shown in Fig. 23 it should be noted that it is, of course, applicable to all types of coil springs.
- the spring of Fig. 23 is surrounded by a stocking 95 of some porous mat ⁇ rial which, by m ⁇ ans of stitches or th ⁇ like indicated at 97, is attached to a longitudinally extending bar or rigid wire 94, which in turn is attached to spring 80, 81 at crossing points 96 in a suitable manner, for example by spot welding, gluing or the like.
- the spring can act as a graft in implantation in for example a blood vessel, and thanks to the fixation of stocking 95 to the axially extending wire 94 it is kept in place during the whole application operation so that after application in the blood vessel it wholly surrounds spring 80, 81 thus forming an artificial tissue in the blood vessel.
- Stocking 95 is suitably made of some stretchable porous material which can follow the spring material in the expansion of the spring in connection with the application at the intended location.
- it can consist of any knitted or stitched material of tricot type with a necessary stretchability or some type of crepe product.
- the alternative is a stretchable plastic film, i.e. elastomer, for example of silicon resin.
- the embodiments of the springs shown in Figs. 22 and 23 may as alternative to the embodiment just described be used as carriers for porous materials, for example tissue, which is illustrated in Fig. 24.
- a ladder-like spring 83 designed for example like the spring of Fig. 22 or 23, is covered with porous material 84.
- Fig. 25 shows in enlargement an axial section through two adjacent turns of the spring of Fig. 24.
- the cross elements 82 are provided with a shoulder 86.
- the spring is covered with porous tissue 84.
- the porous tissue rather than being attached on the outside of the ladder-like devices, is designed in the form of semi-permeable seetions of the band-like material.
- openings 79 of Fig. 22 are replaced by a thinning of the band-material proper, in which thinning very fine perforations have been applied so that the same perforated surface will be obtained.
- cross elements 78 form the necessary rigidification.
- a further advantage of the device according to Fig. 24 is the fact that the porous material does not necessarily need to be elastic in order to participate in the expansion of the spring.
- Fig. 26 shows a modified design of the spring in th ⁇ device according to the invention.
- the modified spring shown in the figure generally indicated 90 is across the major part of its length designed as a conventional spring of constant diameter, whereas at the upper end 91 as shown in Fig. 26 It is designed with a diminishing diameter so that the spring 90 in unloaded state has the configuration shown in the figure.
- the lower free end of the spring ha ⁇ been designated 92 whereas its free upper end has been designated 93.
- the function of the spring shown in Fig. 26 is the same as that of the previously described embodiments of the spring.
- Fig. 17 can be modified for adaptation to the spring according to Fig. 26 by excluding end section 40 and providing the inner element 42a at the end extending through carrier body 37 with a cross groove intended to accomodate and hold the upper free end 93 of spring 90.
- the other end 92 of spring 90 may then in the same manner as described in connection to Fig. 17 be held at the other end of carrier body 37 in connection to end section 41, whereupon in the manner previously described spring 90 can be contracted by rotating rotary members 43, 44 in relation to each other.
- the spring with filter function is self-attaching by engagement againt the inner wall of the vessel without causing damages to the inner wall; 2. the position of the spring can be corrected and removal of same is possible;
- the device results only in an insignificant reduction of the flow across the section of the blood vessel
- a suitable distance between the spring turns in the diminishing part of the spring is about 3 mm. By using such distance the passage of larger tromboses is avoided whereas too early clogging of the diminishing part of the spring is avoided.
- a spring inserted and applied in for example a blood vessel can be removed in the following manner.
- a flexible tube of a diameter adjusted to the blood vessel is inserted up to the end 92 of spring 9C or further up to its other end 93, whereupon the spring end is grabbed in a suitable manner by means of a grip member, whereupon the spring can be retracted through the tube without damaging the surrounding tissue.
- This procedure can be suitable to resort to in case the spring has taken a wrong position or has come to a wrong location in the blood vessel.
- Fig. 27 shows an embodiment modified in relation to the device according to Figs. 2- and 25, whereby the inner wall of a damaged organ can be lined with porous tis ⁇ ue.
- the embodiment contains springs of the type illustrated in Figs. 22 and 23 and reference numerals of the figure contain the corresponding designations as Fig. 23.
- Fig. 27 Acccrding to Fig. 27 the double spring 80-82 is covered with stocking 83 of porous tissue surrounding the separate turns in the spring along the whole length of the spring period.
- the stocking 83 extends side-wise outside th ⁇ spring material whereby there is provided overlap inside adjacent turns of the spring, as is clear from Fig. 27. Also in this case there is obtained sealing if the spring is moved in an axial direction, for example if the device according to Fig. 17 is used to expand the spring.
- the device according to the invention contains the following features taken each per se or in any combination, namely: a) that said other state (Fig. 2; 4) essentially corresponds to unloaded condition of the coil spring 1; 36; b) that shaft 42a and sleeve 42b are releasably connected to coil spring 36; c) an axially extending guide bar 23 arranged at the periphery of the spring on which at least one guide member is displaceably arranged and through which the spring material can move tangentially in connection with the contraction or expansion of the spring; d) fixed guide members 22 distributed over the said given length of the spring and arranged at the periphery of the spring on an axially extending support member 23, the spring material 21 moving tangentially through ⁇ aid fixed guide members in connection with the expansion or contraction of the spring; e) that the end sections or parts thereof 40, 41 of the carrier tody 37 are axially displace able relative to the central part 47 so that in the gaps 46, 48 between the central part 47
- the magazine arranged at one end of the carrier body including a cylindric cassette housing 61, a feed member 63 rotatably arranged therein by which the spring can be moved for contraction or expansion by rotating feed member 63 in one direction or the other; j) that the feed member consists of a feed cylinder 63 eccentrically mounted in the cassette housing 61 a cylinder 63 at its periphery engaging the inside of the cassette housing 61; k) a trapezoid thread provided on th ⁇ inside of cas ⁇ tte housing 61 in which the spring 52 can glide; l) that feed cylinder 63 on its exterior is provided with a friction coating 64 of for example rubber or plastic; m) an elongated carrier body 56 about which the spring 52 is arranged and at one end of which one end of the spring is releasably attached, a magazine section 58 extending from the other end of carrier body surrounded by the spring carrying at it ⁇ outer end a rotary sleeve 59 to which the other end of the
- ceil spring refers to a helical spring of the traditional type.
- the spring used in the device of the invention ne ⁇ d not necessarily have constant diameter or a constant pitch.
- the general configuration is that of a helix.
- the invention is also useful in certain kidney disorders, where so-called haemodialysis takes place.
- a needle or cannula is applied to the patient's arm so that blood is extracted from the body and after purification in a dialyser returned to the body. Since dialyses have to be repeated at least oncs a week problems arise in regard to the blood vessels of the patient.
- the problem has been solved by arranging a so-called by-pass providing a permanent connection between an artery and a vein, for example in the arm of the patient.
- connection may be made of for example vessel prostheses or a vein taken from calves, so-called "solkograft".
- the advantage of using such a by-pass is the fact that the high pressure from the artery provides for expansion of the connecting vein making it easily accessible when inserting the cannula. Moreover, a large number of dialyses can be made before exchanging the connection.
- the connecting conduit is usually positioned beneath the skin and is attached to the artery and the vein by stitching.
- connections hitherto used result in certain problems.
- the prosthesis When the prosthesis is withdrawn beneath the skin in an operation it may be folded and blocked. After the removal of the haemodialysis cannula the connecting prosthesis must be compressed to prevent too large a loss of blood. The artificial vein may then easily collapse resulting in subsequent impaired circulation. It has also been found that so-called stenoses, i.e. contractions, will be formed where the connection is attached to the vein.
- a helical spring of suitable diameter and of a suitable number of turns is attached in an instrument in accordance with the invention, for example as illustrated in Fig. 17, i.e. the spring is in contracted state.
- a prosthesis for example a solkograft, is attached at one end thereof to a vein of the patient by a few stitches. Then the device of the invention including the spring is inserted into the graft so that the outer end of the device with the corresponding end of the spring will reach a position about 2 cm inside the vein. Then the spring is expanded inside the prosthesis and released from the instrument which is then withdrawn from the prosthesis.
- the free end of the graft is transferred up to the opening of the artery and attached thereat.
- the arrangement described above has been found to result in great advantages.
- the graft will not collapse when implanted due to the action of the spring.
- the connecting conduit or prosthesis may safely be compressed or clamped after removal of the cannula for reducing blood losses.
- the conduit immediately returns to full diameter in view of the action of the spring.
- 3- It is easy to find the prosthesis under the skin and this in turn facilitates puncturing the conduit. 4. It has been found that the risk for the formation of stenoses in the vein is reduced, ⁇ n using the conventional technique the site of connection must be changed and moved to another location at least once a year due to formation of stenosis.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU89542/82A AU8954282A (en) | 1981-09-16 | 1982-09-15 | Device for application in blood vessels or other difficultly accessible locations and its use |
GB08326791A GB2124908B (en) | 1981-09-16 | 1982-09-15 | Device for application in blood vessels or other difficultly accessible locations |
BR8208063A BR8208063A (en) | 1981-09-16 | 1982-09-15 | DEVICE FOR APPLICATION IN BLOOD VESSELS OR OTHER DIFFICULT ACCESS PLACES AND THEIR USE |
NL8220336A NL8220336A (en) | 1981-09-16 | 1982-09-15 | Device for dilating vascular tissue - comprises helical spring element which is expanded by relatively rotating ends using external knobs |
DE19823249027 DE3249027C2 (en) | 1981-09-16 | 1982-09-15 | Device for dilating vascular tissue - comprises helical spring element which is expanded by relatively rotating ends using external knobs |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8105510-5 | 1981-09-16 | ||
SE8105510A SE8105510L (en) | 1981-09-16 | 1981-09-16 | DEVICE FOR APPLICATION IN BLODKERL OR SIMILAR RESPONSIBILITY |
SE8202740-0820430 | 1982-04-30 | ||
SE8202740A SE444761B (en) | 1981-09-16 | 1982-04-30 | Arrangement for surgical or medicinal use |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1983000997A1 true WO1983000997A1 (en) | 1983-03-31 |
Family
ID=26657957
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1982/000283 WO1983000997A1 (en) | 1981-09-16 | 1982-09-15 | Device for application in blood vessels or other difficultly accessible locations |
Country Status (13)
Country | Link |
---|---|
US (1) | US4553545A (en) |
EP (1) | EP0088118A1 (en) |
AT (1) | AT392733B (en) |
AU (1) | AU8954282A (en) |
BR (1) | BR8208063A (en) |
CA (1) | CA1204643A (en) |
CH (1) | CH657521A5 (en) |
DE (2) | DE3249027C2 (en) |
FR (1) | FR2512678B1 (en) |
GB (1) | GB2124908B (en) |
IT (1) | IT1152608B (en) |
NL (1) | NL8220336A (en) |
WO (1) | WO1983000997A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
FR2512678A1 (en) | 1983-03-18 |
GB2124908B (en) | 1985-07-17 |
CA1204643A (en) | 1986-05-20 |
DE3250058C2 (en) | 1992-08-27 |
GB2124908A (en) | 1984-02-29 |
EP0088118A1 (en) | 1983-09-14 |
IT8223312A0 (en) | 1982-09-16 |
ATA907182A (en) | 1990-11-15 |
AT392733B (en) | 1991-05-27 |
BR8208063A (en) | 1984-01-10 |
FR2512678B1 (en) | 1986-08-22 |
GB8326791D0 (en) | 1983-11-09 |
AU8954282A (en) | 1983-04-08 |
CH657521A5 (en) | 1986-09-15 |
IT1152608B (en) | 1987-01-07 |
NL8220336A (en) | 1984-01-02 |
US4553545A (en) | 1985-11-19 |
DE3249027C2 (en) | 1992-02-20 |
DE3249027T1 (en) | 1984-10-31 |
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