Patent Application
20230157685
The subject matter of this invention is a bio-compatible and bio-resorbable implantable device for repairing soft tissues.
In particular, the implantable device is suitable for repairing soft tissues subjected to tensile loads under physiological conditions. The implantable device is particularly suitable, although not uniquely intended, for tendon repair. The device may be used in the field of ligament injuries.
This invention also relates to an assembly comprising said bio-compatible and bio-resorbable implantable device and a non-implantable element for perforating the soft tissue.
Tendons are made up of very strong, poorly elastic fibrous tissue, the function of which is to transmit the contractile action exerted by a muscle to the corresponding skeletal segment. Other types of soft tissue subjected to tensile loads are formed of ligaments.
Fibrous tendon tissue is mainly made up of type I collagen chains helically wound to form a set of fibers aligned in the transmission direction of the load.
Tendons may be injured in various ways: direct trauma (cuts, crushing, lacerations, etc.) or indirect trauma (violent muscle contractions, sudden flexion or counter-resistance of a joint, etc.); athletes and dancers in particular are exposed to indirect trauma and the tendons most frequently involved are the Achilles tendon, the patellar-femoral tendon, the biceps, and the flexors of the fingers. Tendons may also deteriorate as a result of excessive fatigue, as may occur in the case of dancers, in degenerative diseases or the like, and/or related causes. Some additional areas of particular interest are: the hand flexors, foot flexors, tibialis anterior, patellar tendon, and the tendons of the quadriceps, biceps, and rotator cuff.
In most cases, the tendon must be surgically repaired to heal; the procedure involves making an incision in the skin, isolating and bringing the tendon stumps together and keeping them in contact until the tendon is completely healed; healing occurs through the formation of scar tissue, which is less resistant, and “neo-tendon” tissue, i.e., that which is functionally and histologically similar to the healthy tendon. The relationship between the two regenerated tissues is directly linked to the type of surgical repair and to the rehabilitation methods.
Surgical suturing (thread and needle) with resorbable or non-resorbable material is currently the most used system to repair tendon injuries; it has a low cost, is easily available, does not require dedicated tools for its application, and currently has a more favorable cost-benefit index than the other treatments on the healthcare market. However, surgical suturing has a number of drawbacks: it promotes the formation of scar tissue both inside and outside the tendon resulting in lower resistance to tensile forces of the repaired tissue and increased resistance to the sliding of the tendon and to the development of the joint movement; the locking point of the thread (knot) is the main area of weakness to tensile forces of the system with re-ruptures of the tendon possible; both the thread and the knot determine, at the point of repair, an increase in the size of the tendon in a measure directly proportional to the increase in the caliber of the thread required, with potential repercussions on the tissues adjacent thereto, without thereby leading to an improvement in the mechanical properties of the tendon.
The various suturing techniques may require a super-specialized preparation because they are not easy to perform. The suture does not ensure a sufficient grip for active joint mobilization and, depending on the tendons, passive mobilization for three or four weeks, with a resulting delay in physiotherapy and increased complications such as pain, joint stiffness, failure to recover movement, need for follow up surgery. For these reasons, patients who suffer a tendon lesion are forced into a long period of disability, require prolonged physiotherapy, and in no small percentage of cases do not fully recover the functionality of the affected area.
Naturally, even in the case of animals, especially competition animals, such as for example horses, the aforementioned problems are encountered mutatis mutandis.
The need is therefore strongly felt to provide an improved solution with respect to conventional surgical sutures for the treatment of traumatic injuries of the tendons.
In place of traditional surgical sutures, systems have been proposed that use staples, rivets, pins, or other metal retaining elements, which obviously do not solve the problems described above with reference to sutures, especially with regard to the invasiveness of the inserted device, the potential to cause inflammation and infection, and a non-optimal distribution of stresses, being in the best of cases only simpler for an operator, for example a surgeon, to apply.
For example, U.S. Patent Application No. US-2015-0173737 discloses a solution for repairing an injured tendon consisting of an elongated element intended to be inserted inside both stumps of the tendon to be repaired to act substantially as a retaining element between the two stumps. Sutures or other fastening systems of the elongated element allow it to be fastened to the tendon stumps, which otherwise would tend to move away in the event of muscle contractions in that area. This solution is therefore very invasive and requires making a longitudinal cavity to insert the elongated element inside the body of the two tendon stumps to be brought together, which then must be sutured or riveted to the tendon, causing further permanent inflammation. The application procedure is also complex and entails a risk of injury for the surgeon.
For example, U.S. Patent Application No. US-2003-0065360 shows a bandage intended to be wrapped around a tendon and provided with sharp clamping barbs designed to be individually anchored to the tissue to be repaired to secure the bandage to the tissue, substantially acting as a clamping band. This solution, if applied to tendon repairs, would not be without drawbacks. For example, the tips of the clamping barbs of the bandage would act as needles resulting in a source of further localized, as well as distributed, inflammation, due to the large number of such clamping barbs, in the tissue of the tendon to be repaired. Or worse, in the event that such needles or barbs infiltrate between the longitudinal fibers of the tendon to be repaired, the clamping could even fail. The sharp barbs are further arranged in parallel rows, i.e., along the same tendon fiber, and, during muscle contraction and tensioning of the cuffed tendon, this would likely cause mechanical stress focused on a small number of fibers, easily causing the fraying and/or the longitudinal separation of the tendon fibers, as well as the removal of said sharp barbs.
For example, U.S. Patent Application No. US-2018-0168798 in the name of CABLE FIX shows a solution formed by a pair of rigid metal plates linked together with a wire or cable that tends to urge the two plates towards each other through the body of the tissue to be repaired. Spacer elements extend through the body of the tissue latching the two plates together and are provided with relevant sliding grooves for the plates having abutment surfaces which limit the approach between the two plates by keeping them at a certain distance. Sharp perforating needles are provided on one of the two plates to penetrate the tendon tissue. This solution does not solve the aforementioned problems relating to sutures due to the provision of said prestressed cables. The prestress exerted by these cables constantly presses to compression the cross section of the tissue between the plates. In addition, the sharp needles are a source of further inflammation and damage to the tissue to be repaired.
For example, Italian patent application No. IT-2018-000006092 in the name of the same Applicant shows a clamping band solution to be wrapped around a tendon provided with barbs for anchoring to the tendon stumps to be repaired. This solution, although advantageous from some points of view and in particular due to its intrinsic compatibility with biological tissues, is not suitable for satisfactorily stimulating the regeneration of the native fibrous tissue of the tendon, imposing long healing times, which are often incompatible with the contingent professional needs of athletes and dancers.
The need is therefore strongly felt to provide a solution to repair a soft tissue, for example a tendon or a ligament, which is of reduced invasiveness with respect to known solutions, easy to apply through surgery, and at the same time suitable for allowing a rapid and complete recovery of the functionality of the tissue while also ensuring the mechanical resistance necessary for the entire duration of the rehabilitation phase.
The need is also felt to provide a solution to repair damaged soft tissue, for example a tendon or a ligament, in a shorter time, without being more invasive or even worse, resulting in an unsatisfactory functional recovery of the tissue.
The need is felt for a solution which is definitive and therefore avoids a second surgical intervention for its extraction and which does not damage the soft tissue over long periods if it remains in place.
One object of this invention is to remedy the drawbacks of the prior art heretofore attested with reference to the state of the art.
A particular object of this invention is to devise a bio-compatible and bio-resorbable device, minimally invasive and suitable for allowing a rapid and complete healing of the soft tissue, such as for example a damaged tendon.
This and other objects are achieved with a device according to claim 1, as well as with an assembly according to claim 11.
Some advantageous embodiments are the subject of the dependent claims.
According to an aspect of the invention, a bio-compatible and bio-resorbable implantable device for repairing a soft tissue, for example a tendon, comprises at least two plates that may be interlocked by means of a plurality of connecting elements which act as elements for positioning the plates with respect to each other and with respect to the tissue to be repaired. The at least two plates and the connecting elements are all bio-compatible and bio-resorbable. The connecting elements extend from one plate to the other plate with the purpose of locking said first plate and said second plate in a definable respective position, avoiding the need for suture threads.
According to an aspect of the invention, an assembly comprises at least one bio-compatible and bio-resorbable implantable device and a non-implantable perforating device made as a separate piece from said bio-compatible and bio-resorbable implantable device, wherein said perforating device comprises a plurality of perforating elements suitable for making perforations, preferably through perforations, in said soft tissue to form positioning paths for said plurality of connecting elements of the bio-compatible and bio-resorbable implantable device. The perforating device may be made in the form of another non-implantable plate.
The implantable device may also provide a possible functional coating with growth factors or with drugs that promote and speed up the process of forming autologous tissue, thus decreasing the risk of excessive scar tissue formation. These substances do not necessarily have to be in the form of a coating, but rather may be contained or encapsulated within nanoparticles, which may be inserted or incorporated within the same material and therefore distributed over the entire volume of the implantable device.
The connecting elements comprise a first portion integral with the first plate and a second portion integral with the second plate. For example, a first connecting element portion is formed by a pin and the second connecting element portion is formed by a rim of a hole.
The connecting elements may be of equal shape and size to each other, as well as made of the same material composition.
The interlocking of two portions of a connecting element and in this way of the plates to each other may take place by means of undercut coupling.
The tips of the pins or protrusions of the connecting elements may be rounded to avoid injuring the tissue to be repaired. The lateral surface of the connecting elements may be rounded.
The perforating elements may each define a longitudinal through channel to allow the insertion of the connecting elements of the bio-compatible and bio-resorbable implantable device, whereby the perforating elements are fitted on the first portion or on the second portion of the connecting elements during implantation of said first plate or of said second plate, respectively.
The connecting elements may each define a longitudinal through channel for inserting the perforating elements of the perforating device, whereby the connecting elements are fitted onto the perforating elements during the implantation of at least one of said first plate or said second plate.
The perforating elements may be made in separate pieces with respect to the support of the perforating device and fastened thereto, for example by means of threaded fastening means.
By virtue of the proposed solutions, a bio-compatible and bio-resorbable implantable device is provided, suitable to act as an element for transmitting the tensile load to injured soft tissue, for example a tendon, thus avoiding tensile stress on the length of soft tissue in the healing phase.
By virtue of the proposed solutions, it is possible to uniformly distribute the tensile load in the cross section of the soft tissue, for example a tendon, during the autologous tissue regeneration or self-repair phase.
The bio-compatibility of the material of the implantable device allows for unfavorable interactions between said material of the implantable device and the surrounding tissues to be avoided, ensuring the formation of autologous tissue and self-repair, without inducing the excessive formation of scar tissue and inflammatory processes related thereto.
By virtue of the proposed solutions, a non-implantable perforating device is provided, suitable to guide the minimally invasive insertion of the bio-compatible and bio-resorbable implantable device into the soft tissue to be repaired, for example a tendon. By virtue of the proposed solutions, a bio-compatible and bio-resorbable implantable device is provided, suitable to fully degrade within the organism of a human or animal patient within a reasonable time for the tissue repair of the soft tissue to be repaired, for example a tendon, avoiding the release of solid residues at the implantation site. The provision of such a bio-compatible and bio-resorbable implantable device avoids the need to extract the implantable device from the implantation site.
By virtue of the proposed solutions, the patient is placed in the conditions to achieve a faster and more satisfactory functional recovery.
By virtue of the proposed solutions, the risk of excess scar tissue forming in the soft tissue to be repaired is avoided.
By virtue of the proposed solutions, a physiological imbibition of the soft tissue to be repaired is allowed at or near the tissue lesion, promoting in an unusual way the regeneration of the soft tissue, for example tendon regeneration.
The bio-compatible and bio-resorbable implantable device is particularly suitable, although not uniquely intended, for implantation in a human patient, for example to repair the Achilles tendon as well as the patellar-femoral tendon, biceps, finger flexors, hand flexors, foot flexors, anterior tibialis, patellar tendon, and tendons of the quadriceps, biceps, and rotator cuff.
The bio-compatible and bio-resorbable implantable device is also suitable for implantation in an animal patient, such as a racehorse.
Further features and advantages of the implantable device and of the assembly according to the invention will appear from the description given below of its preferred embodiments, given by way of non-limiting example, with reference to the attached figures, wherein:
According to a general embodiment, a bio-compatible and bio-resorbable implantable device 10 is provided for repairing a soft tissue 1, and preferably for repairing a tendon 1.
“Soft tissue 1” preferably refers to a soft tissue suitable to be stressed in extension when in physiological conditions, such as for example a tendon 1.
In the following description the term “tendon 1” will be used, referring, where applicable, also to “ligament 1.” The bio-compatible and bio-resorbable implantable device 10 is also suitable for repairing ligament tissue 1.
The implantable device 10 comprises at least two bio-compatible and bio-resorbable plates 11, 12 comprising a first plate 11 and a second plate 12.
The plates 11, 12 are made in separate pieces from one another and are interlockable with each other.
The first plate 11 may be made in a single piece. The second plate 12 may be made in a single piece.
The implantable device 10 further comprises a plurality of bio-compatible and bio-resorbable connecting elements 20 suitable for connecting said first plate 11 and said second plate 12 together. For example, said bio-compatible and bio-resorbable connecting elements 20 comprise pins 24, 24′, 24″ and hole rims 23 which receive a portion of said pins 24, 24′, 24″.
The tendon 1 to be repaired comprises a tendon body 2 which is pathologically interrupted forming a tendon lesion 5. The tendon lesion 5 may involve the entire cross section of the tendon 1 defining two tendon stumps or only a part thereof.
The tendon lesion 5 may refer to a stretch of tendon 1 not necessarily interrupted and therefore not having clear geometric discontinuity but nevertheless unable to effectively transmit the forces in the length concerned.
The first plate 11 comprises a first surface 13 suitable for being placed on a first side 3 of the tendon 1 to be repaired. Preferably, the first surface 13 of the first plate 11 is placed on a portion of the first tendon side 3 which comprises said tendon lesion 5. In other words, the first surface 13 is placed on the tendon lesion 5, substantially straddling said lesion.
The second plate 12 comprises a second surface 14, suitable for being placed on a second side 4 of the tendon 1 to be repaired, opposite to said first side 3 of the tendon 1 to be repaired with respect to the body 2 of said tendon to be repaired. Preferably, the second surface 14 of the second plate 12 is placed on a portion of the second tendon side 4 which comprises said tendon lesion 5. In other words, the second surface 14 is placed on the tendon lesion 5, substantially straddling said lesion.
In this way, the first plate 11 and the second plate 12 of the implantable device 10 are intended to be implanted whereby they are mutually contraposed and facing each other and separated by the body 2 of the tendon 1 to be repaired in the portion where the tendon lesion 5 is present. In other words, the first plate 11 and the second plate 12 are both arranged to cover the tendon lesion 5 on opposite sides 3, 4 of the body 2 of the tendon 1. Preferably, the body 2 of the tendon 1 is formed of a plurality of fibers or filaments which extend in the preferential direction of load transfer of said tendon 1, and the lesion 5 may be extended in a direction transverse to the preferential direction of load transfer, i.e., transversely to the fibers. The lesion 5 may be extended also at least partially substantially aligned with the fibers of the soft tissue 1 to be repaired, such as for example a tendon 1.
Advantageously, said plurality of connecting elements 20 of the implantable device 10 extend from at least one of said first surface 13 of the first plate 11 or said second surface 14 of the second plate 12 to reach the other of said first surface 13 of the first plate 11 and said second surface 14 of the second plate 12.
Preferably, the length of these connecting elements 20 is so as not to protrude beyond the back of the plates 11, 12, avoiding causing friction with the surrounding tissues which could inflame these surrounding tissues and could hinder the movement of the implantable device 10 integral with the tendon 1 during physiological movements of the tendon 1.
With a further advantage, the purpose of said plurality of connecting elements 20 is to lock said first plate 11 and said second plate 12 in a definable respective position.
In this way, the positioning elements 20 act as positioning elements for the plates 11, 12 with respect to the tendon 1 to be repaired.
Preferably, the plates 11, 12 are locked together in a respective configuration by the connecting elements 20, avoiding the presence of residual degrees of freedom of mutual movement between the plates 11, 12.
The plates 11, 12 therefore perform the dual function of transmitting forces in the tract wherein they are not transmissible along the injured tendon, as well as maintaining the relative position of the tendon tracts, maintaining the diastasis between the two tendon stumps within a physiological distance which allows tissue regeneration between said two stumps.
The first surface 13 and the second surface 14 intended to come into contact on opposite sides 3, 4 of the tendon 1 to be repaired may preferably be worked so as to be made smooth, thus reducing the risk of inflammation of the tendon to be repaired due to chafing by friction.
According to an embodiment, at least some connecting elements of said plurality of connecting elements 20 of the implantable device 10 extend in the form of protrusions 24, 24′, 24″ from the first surface 13 of the first plate 11.
According to an embodiment, at least some connecting elements of said plurality of connecting elements 20 of the implantable device 10 extend in the form of protrusions 24, 24′, 24″ from the second surface 14 of the second plate 12.
Preferably, when the implantable device 10 is implanted, each connecting element 20 extends from said first surface 13 to said second surface 14, although at least one connecting element or each connecting element 20 may be made in at least two separate pieces, i.e. a first piece 21 or first portion 21 integral with the first plate 11 and a second piece 22 or second portion 22 integral with the second plate 12, defining a locking portion 28 which, when the implantable device 10 is implanted, may be embedded in the body 2 of the tendon 1.
In the event that at least one connecting element or each connecting element extends from said first surface 13 to said second surface 14 without interruption, the locking portion 28 will be placed near one of said first plate 11 or said second plate 12. In this case, for example, the second portion 22 of the connecting element 20 will be formed by the rim of a hole 23 integral with the second plate 12.
According to a preferred embodiment, each connecting element of said plurality of connecting elements 20 comprises two portions 21, 22 which are interlockable with each other, forming a plurality of locking portions 28. In this way, it is possible to lock said first plate 11 and said second plate 12 together.
The portions of each connecting element 20 may interlock in various ways.
According to an embodiment, the two portions 21, 22 of a connecting element 20 interlock by undercut coupling, wherein a first portion 21 of the connecting element integral with the first plate 11 comprises a first abutment surface 25 facing the first surface 13 of the first plate 11, so as to couple against a second abutment surface 26 of the second plate 12 opposed or contraposed to the second surface 14 of the second plate 12. For example, the second abutment surface 26 may be placed on the back 19 of the second plate 12.
According to an embodiment, said protrusions 24, 24′, 24″, which form at least one of said first portion 21 or said second portion 22 of each connecting element 20, comprise a head 29 having a tip 43 which is convex. The provision of the convex tip 43 of the head 29 of a first or second portion 21, 22 of a connecting element avoids inflaming the tendon 1 to be repaired during the implantation of the bio-compatible and bio-resorbable implantable device 10.
According to an embodiment, said protrusions 24, 24′, 24″, which form at least one of said first portion 21 or said second portion 22 of each connecting element 20, a convex base 42, for example substantially circular, and a lateral surface 44 without sharp edges, for example cylindrical or frusto-conical. The provision of a first or second portion 21, 22 of a connecting element without sharp edges, for example substantially frusto-conical or cylindrical, avoids inflaming the tendon 1 to be repaired.
The lateral surface may extend from the base 42 to the head 29. The head 29 may form an undercut surface facing the base 42 which acts as the abutment surface 25 or 26. For example, the lateral surface and the head 29 form a substantially mushroom-shaped element.
As shown for example in
According to an embodiment, the two portions of a connecting element 20 interlock by latching.
According to an embodiment, the two portions of a connecting element 20 interlock by snap-fitting following an elastic deformation of a portion of the connecting element.
According to an embodiment, the two portions of a connecting element 20 interlock by force fitting or interference fitting, wherein the deformation of at least a portion of the connecting element interlocks with the first plate 11 and the second plate 12 by friction.
According to an embodiment, the two portions of a connecting element 20 interlock by hook-loop coupling, such as, for example, by means of Velcro®.
According to an embodiment, the two portions of a connecting element 20 interlock by a combination of the methods described above.
When the implantable device 10 has been implanted and has been bio-resorbed, it will be dissolved, and the body 2 of the tendon 1 will have healed the lesion 5 and is preferably indistinguishable from said tendon before the formation of the lesion 5.
According to an embodiment, said first plate 11 and said second plate 12 each have a closed and continuous plate edge 15, 16, wherein the edge 15 of the first plate 11 defines the perimeter of said first surface 13 of the first plate 11, and wherein the edge 16 defines the perimeter of said second surface 14 of the second plate 12.
According to an embodiment, said plurality of connecting elements 20 extend from said first surface 13 of the first plate 11 to said second surface 14 of the second plate 12 substantially straight, i.e., in a substantially straight line, in a direction transverse to the extension of the plates 11, 12. The substantially straight extension lines of the connecting elements are preferably parallel to each other, minimizing the length of these connecting elements.
In this way, it is possible to maximize the resistance of the bio-compatible and bio-resorbable connecting elements 20 and likewise the resistance that the implantable device 10 offers to the respective distancing of the margins of the lesion 5 of the tendon 1 to be repaired.
According to an embodiment, at least some connecting elements of said plurality of connecting elements 20 are formed by a blind or through hole 23 positioned on said first plate 11 or said second plate 12 and by a protrusion 24 positioned on the other of said first plate 11 or said second plate 12 in a position facing said blind or through hole 23.
According to an embodiment, at least some connecting elements of said plurality of connecting elements 20 are formed of a first protrusion 24′, which extends from said first plate 11, and a second protrusion 24″, which extends from said second plate 12 in a position facing said first protrusion 24′, wherein said first protrusion 24′ defines said blind or through hole 23, and wherein said second protrusion 24″ defines said head 29, which, as shown for example in
According to an embodiment, said plurality of connecting elements 20 are arranged on arrays S1, S2 or rows, wherein the connecting elements of a first array S1 are arranged staggered with respect to the connecting elements of a second array S2 contiguous to said first array S1. Preferably, the arrays S1, S2 follow each other in a direction transverse to the direction of extension of the plurality of connecting elements 20 and transverse to the preferential direction of transmission of the forces of said tendon 1.
The lateral surfaces 44 of the connecting elements 20 form positioning abutments for the fibers of the tendon 1 to be repaired which promote the healing of the lesion 5. The lateral surfaces of the connecting elements 20 are preferably curved, avoiding sharp edges which could damage the body 2 of the tendon to be repaired both during implantation and when implanted inside the body 2 of the tendon 1 to be repaired.
The curved lateral surfaces of the connecting elements 20 also allow the mechanical strength of the connecting elements to be maximized.
According to an embodiment, said plurality of connecting elements 20 keep said first surface 13 of the first plate 11 and said second contraposed surface 14 of said second plate 12 apart by a distance 40, forming one or more windows 17 delimited at least partially by both said first plate 11 and said second plate 12 and suitable for exposing a portion of the tendon 1 to the surrounding environment. Preferably, said one or more windows 17 are delimited by both plate edges 15, 16 of said first and second plate 11, 12.
The windows 17 allow for the vascularization of the tendon 1 at or near the lesion 5 when the implantable device 10 has been implanted.
According to a general embodiment, an assembly 30 for repairing a soft tissue 1, for example a tendon 1, comprises at least one bio-compatible and bio-resorbable implantable device 10 according to any of the embodiments described above.
Said assembly 30 further comprises a non-implantable perforating device 31 made in a separate piece with respect to said bio-compatible and bio-resorbable implantable device 10. Preferably, said perforating device 31 is made in the form of a third perforating plate 31.
Said perforating device 31 comprises a plurality of perforating elements 33 suitable for making through perforations 32 in said tendon 1 to form positioning paths for said plurality of connecting elements 20 of the bio-compatible and bio-resorbable implantable device 10.
According to an embodiment, said plurality of perforating elements 33 each delimit a longitudinal through cavity 34 for the insertion of at least one portion 21 or 22 of the connecting elements of said plurality of connecting elements 20 of the bio-compatible and bio-resorbable implantable device 10. In this way, the perforating elements are fitted onto the connecting elements 20 during implantation of the implantable device 10.
According to an embodiment, said at least one portion 21 or 22 of the connecting elements 20 of said plurality of connecting elements 20 delimits a longitudinal through cavity 34′ for the insertion of said plurality of perforating elements 33 of the perforating device 31. In this way, the connecting elements 20 of the implantable device 10 are fitted onto the perforating elements 33 of the perforating device 31, during the implantation of the implantable device 10.
According to an embodiment, said perforating device 31 comprises a support 36 from which said perforating elements 33 extend. The support 36 is preferably a plate so that the perforating device 31 forms a further third plate 31 of the assembly 30.
Preferably, the perforating elements 33 each comprise a sharp perforating end 35, obtained for example on the cylindrical rim of each perforating element 33.
According to an embodiment, the perforating elements 33 are made in separate pieces with respect to the support 36 and fixed thereto through fastening means. Said means for fastening the perforating elements 33 to the support 36 are preferably threaded fastening means of the screw-nut type, whereby the perforating elements 33 are screwed to the support 36.
According to an embodiment, each perforating element 33 is individually screwed to the support 36 by means of a fastening screw 38. The term “screw” also refers to a fastening grub screw 38. According to an embodiment, each perforating element 33 comprises a fastening root 45 opposite to the sharp perforating end 35 screwed to the support 36. The fastening root 45 may be screwed to the support 36 by tapping the fastening root 45. Preferably, the fastening root 45 is screwed to the support 36 by providing a threaded seat 39 in the fastening root which engages with a fastening screw 38, attaching itself to the support 36. The support 36 may be provided with through holes 46 to allow the fastening screw 38 to screw into the threaded seat 39 of the fastening root 45 of the perforating element 33. The fastening screw 38 may be inserted from the back 47 of the support 36, in other words from the face of the support facing opposite to the perforating elements 33. The through holes 46 of the support 36 may each comprise an abutment projection 48, for example an internal abutment crown 48, and the fastening root 45 abuts against the abutment crown 48. The fastening root 45 may be provided with an abutment counter-ridge 49, for example a fastening flange 49 which abuts against the abutment crown 48. The abutment projection 48 may form a further abutment surface for the head of the fastening screw 38. The fastening screw 38 may also be screwed to the walls 39′ of the through hole 46 of the support 36.
The perforating elements 33 may be welded or glued to the support 36.
The perforating device 31 may be made of any rigid material, re-sterilizable, and suitable for perforation, such as for example titanium or other surgical metal.
According to an embodiment, the support 36 comprises a thrust surface 37 intended to abut against the plate back 19 of at least one of said first plate 11 or said second plate 12 during the implantation of the implantable device 10, to push the connecting elements 20 inside the through perforations 32 made by the perforating elements 33 inside the body 2 of the tendon 1. In this way it is possible to push at least one of said first plate 11 or said second plate 12 against the surface of the soft tissue 1 to be repaired.
Preferably, the longitudinal extension of each perforating element 33 is greater than the longitudinal extension of the associable first portion 21 of the connecting element 20, but not excessively greater, so as to make its use practical in the operative phase.
The provision, during the implantation of the implantable device 10 of said perforating device 31 equipped with said perforating elements 33, which are fitted onto said connecting elements 20, as well as said connecting elements 20, fitted on said perforating elements 33, allows the insertion of the bio-compatible and bio-resorbable implantable device 10 to be guided through the body 2 of the tendon 1 to be repaired.
The arrangement of the perforating elements 33 on the support 36 of the perforating device 31 is preferably coordinated with and corresponding to the arrangement of the connecting elements 20 on the plates 11, 12. In this way, the perforating elements 33 are also arranged in arrays or rows S1, S2.
As shown for example in
As shown for example in
As shown for example in
The bio-compatible and bio-resorbable implantable device 10 may be made of a material which is obtained by mixing two or more biopolymers in order to provide optimal mechanical characteristics of tensile strength ensuring their biocompatibility and bioresorbability. For example, said bio-compatible and bio-resorbable implantable device 10 is made by means of a mixture of polylactic acid, PLA, and polycaprolactone, PCL. By acting on the composition of the mixture it is possible to obtain a regulation of the mechanical properties as well as of the degradation rate, in other words the bio-resorption rate, which must allow the connecting elements 20, particularly the protrusions 24, 24′, 24″, and preferably also the plates 11, 12, a bio-resorption time congruent with the time of repair of the soft tissue 1, for example a tendon 1.
Preferably, the bio-compatible and bio-resorbable polymeric mixture degrades through a process of hydrolysis in a physiological environment, the loss of mass may preferably occur through bioerosion in the entire volume (i.e. “in bulk”) or superficially. The connecting elements 20, and particularly the protrusions 24, 24′, 24″, may have different mechanical properties, bio-resorption properties, bio-erosion properties and different composition with respect to the plates 11, 12.
According to an embodiment, connecting elements 20, and particularly the protrusions 24, 24′, 24″, are made of a material having an elastic modulus between 0.2 gigapascals and 4 gigapascals. Preferably, the elastic modulus is comprised between 0.2 gigapascals and 3 gigapascals. According to one embodiment, the elastic modulus is between 0.9 gigapascals and 2.6 gigapascals. The plates 11, 12 may have an elastic modulus equal to or less than that of the connecting elements 20, and particularly of the elastic modulus of the protrusions 24, 24′, 24″. The elastic modulus of the implantable device 10 may be comparable to that of the soft tissue 1.
The bio-compatible and bio-resorbable implantable device 10 may be fabricated by additive manufacturing, such as 3D printing.
The bio-compatible and bio-resorbable implantable device 10 may be fabricated by soft-lithography, soft-tooling or other similar technologies.
By virtue of the features described above provided severally or jointly with each other in particular embodiments, it is possible to obtain a bio-compatible and bio-resorbable implantable device as well as an assembly, which at the same time satisfies the above-described requirements, conflicting with each other, and the aforementioned desired advantages, and in particular:
A person skilled in the art, in order to satisfy contingent and specific needs, may make numerous modifications and adaptations to the embodiments described above, and replace elements with other functionally equivalent ones, without however departing from the scope of the following claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102020000006967 | Apr 2020 | IT | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/IB2021/052721 | 4/1/2021 | WO |
