Patent Grant
9775661
The embodiments disclosed herein relate to bone implants, and more particularly to devices and methods for bone restructure and stabilization.
Bones form the skeleton of the body and allow the body to be supported against gravity and to move and function in the world. Bone fractures can occur, for example, from an outside force or from a controlled surgical cut (an osteotomy). A fracture's alignment is described as to whether the fracture fragments are displaced or in their normal anatomic position. In some instances, surgery may be required to re-align and stabilize the fractured bone. But proper positioning and alignment of a bone is difficult to achieve. It would be desirable to have an improved device or method for stabilizing, positioning, and repairing a fractured or weakened bone.
Devices and methods for bone restructure and stabilization are disclosed herein. According to aspects illustrated herein, there is provided a device for repairing or stabilizing a fractured or weakened head of a bone that includes a delivery catheter having an elongated shaft with a proximal end, a distal end, and a longitudinal axis therebetween, the delivery catheter having an inner void for passing at least one light sensitive liquid, and an inner lumen; an expandable member releasably engaging the distal end of the delivery catheter, the expandable member moving from a deflated state to an inflated state when the at least one light sensitive liquid is passed to the expandable member, wherein the expandable member is sufficiently designed to be at least partially placed into a space within a head of a bone; and a light conducting fiber sized to pass through the inner lumen of the delivery catheter and into the expandable member, wherein, when the light conducting fiber is in the expandable member, the light conducting fiber is able to disperse the light energy to initiate hardening of the at least one light sensitive liquid within the expandable member, forming a photodynamic implant of the present disclosure. In an embodiment, the expandable member is sufficiently designed to be contained within a head of a bone. In an embodiment, the expandable member is sufficiently designed such that a head section of the expandable member is within a head of a bone and a shaft section of the expandable member extends for a length into the shaft of the bone.
In an embodiment, a photodynamic implant of the present disclosure acts as a mandrel or form over which fragments of a head of a bone can be arranged to a substantially original position. In an embodiment, a photodynamic implant acts as a filler to return a head of a bone substantially to its original, anatomical shape prior to fracture or breaking In an embodiment, a photodynamic implant of the present disclosure is used for reattaching bone fragments of a head of a bone separated from the bone. In an embodiment, a photodynamic implant of the present disclosure is used for fixating a head of a bone separated from the bone. In an embodiment, a photodynamic implant of the present disclosure is used to re-align fragments of a broken bone to promote fracture restructure and stabilization. In an embodiment, a photodynamic implant of the present disclosure provides support and stability to a fractured or weakened bone during the natural healing process of the bone. In an embodiment, a photodynamic implant of the present disclosure is used to provide added strength to a weakened bone.
In an embodiment, a photodynamic implant of the present disclosure is configured to engage with another implant, including, but not limited to, a metal screw, rod, pin or nail. In an embodiment, a photodynamic implant of the present disclosure provides means to secure, bolt and pull the fractured bone segments back together into position. In an embodiment, a photodynamic implant of the present disclosure is used to fill a space within a fractured bone to return the fractured bone to its anatomical shape and is engaged to another implant that provides strength and stability to the shape. In an embodiment, a photodynamic implant of the present disclosure is configured to receive bone screws such that compressive force is exerted on bone fragments supported by the photodynamic implant.
In an embodiment, a photodynamic implant of the present disclosure is configured to fill interstitial space between a bone fixation implant and cortical bone to distribute load more evenly across the bone interface. That is, a photodynamic implant of the present disclosure acts as a filler between a bone fixation implant and a cortical bone interface so that load is not transferred through focal contact points between the bone fixation device and the cortical bone, but rather the load is distributed throughout a conformal contact in the bone.
A device for restructuring or stabilizing a fractured or weakened head of a bone is provided. The device includes: a delivery catheter having an elongated shaft with a proximal end, a distal end, and a longitudinal axis therebetween, an inner void for passing at least one light sensitive liquid, and an inner lumen; an expandable member releasably engaging the distal end of the delivery catheter; and a light conducting fiber sized to pass through the inner lumen of the delivery catheter and into the expandable member. The expandable member is capable of moving from a deflated state to an inflated state when the at least one light sensitive liquid is passed to the expandable member. The expandable member is sufficiently designed to be at least partially placed into a space within a head of a bone. When the light conducting fiber is in the expandable member, the light conducting fiber is able to disperse the light energy to initiate hardening of the at least one light sensitive liquid within the expandable member to form a photodynamic implant
In an embodiment, the expandable member has a pear shape, bulb shape, dome shape, rounded shape, or elongated shape. In an embodiment, the expandable member has a tapered elongated shape. In an embodiment, the expandable member has a retrograde shape or an antegrade shape. In an embodiment, the expandable member has a proximal end and a distal end, and the diameter of the proximal end of the expandable member is larger than the diameter of the distal end of the expandable member. In an embodiment, the expandable member has a proximal end and a distal end, and the diameter of the distal end of the expandable member is larger than the diameter of the proximal end of the expandable member. In an embodiment, the expandable member is sufficiently designed to be contained within a head of a bone. In an embodiment, the expandable member includes a head section and a shaft section, and the expandable member is sufficiently designed such that the head section can be placed within a head of a bone and the shaft section can extend for a length into a shaft of the bone.
In an embodiment, the photodynamic implant is configured to engage with at least one bone fixation implant. In an embodiment, the at least one bone fixation implant is a screw, rod, pin, nail, or combination thereof. In an embodiment, the light conducting fiber includes a core and a cladding disposed on the core, and the cladding has at least one cut therein to expose the core and configured to alter the light exuded from the light conducting fiber.
In one aspect, a kit for repairing or stabilizing a fractured or weakened head of a bone includes: a light conducting fiber; at least one light sensitive liquid; a delivery catheter having an elongated shaft with a proximal end, a distal end, and a longitudinal axis therebetween, an inner void, and an inner lumen; and an expandable member releasably engaging the distal end of the delivery catheter. The expandable member is sufficiently designed to be at least partially placed into a space within a head of a bone. The delivery catheter has an inner void for passing the at least one light sensitive liquid into the expandable member, and an inner lumen for passing the light conducting fiber into the expandable member. In an embodiment, the kits includes a plurality of expandable members of different sizes or shapes. In an embodiment, the kit includes a light source.
In one aspect, a method for repairing or stabilizing a fractured or weakened head of a bone includes: placing an expandable member removably attached to a distal end of a delivery catheter at least partially into a space within a head of a bone; infusing a light sensitive liquid into the expandable member through an inner lumen of the delivery catheter; inserting a light conducting fiber into the expandable member through an inner void of the delivery catheter; and activating the light conducting fiber to cure the light sensitive liquid inside the expandable member to form a photodynamic implant inside the head of the bone. In an embodiment, the expandable member has a tapered elongated shape.
In an embodiment, the method includes disposing a head section of the expandable member within a head of a bone and extending a shaft section of the expandable member for a length into the shaft of the bone. In an embodiment, the method includes engaging the photodynamic implant with at least one bone fixation implant. In an embodiment, the at least one bone fixation implant is a screw, rod, pin, nail, or combination thereof. In an embodiment, the bone is a femur or a humerus.
The presently disclosed embodiments will be further explained with reference to the attached drawings, wherein like structures are referred to by like numerals throughout the several views. The drawings shown are not necessarily to scale, with emphasis instead generally being placed upon illustrating the principles of the presently disclosed embodiments.
While the above-identified drawings set forth presently disclosed embodiments, other embodiments are also contemplated, as noted in the discussion. This disclosure presents illustrative embodiments by way of representation and not limitation. Numerous other modifications and embodiments can be devised by those skilled in the art which fall within the scope and spirit of the principles of the presently disclosed embodiments.
Devices and methods for bone restructure and stabilization are disclosed herein. In an embodiment, the present disclosure is directed to devices and methods for human treatment of bone fractures. In an embodiment, the present disclosure is directed to devices and methods for veterinary treatment of a fractured or a weakened bone. In an embodiment, devices and methods are provided for restructure, alignment and stabilization of a bone having a rounded head. The devices of the present disclosure are suitable to treat any fractured or weakened bone including, but not limited to, tibia, femur, fibula, humerus, ulna, radius, metatarsals, metacarpals, phalanx, phalanges, ribs, spine, vertebrae, clavicle, pelvis, wrist, mandible, and other bones. In an embodiment, a bone implant system of the present disclosure is used to treat a fractured or weakened proximal humerus. In an embodiment, a bone implant system of the present disclosure is used to treat a fractured or weakened femoral head.
As used herein, the terms “fracture” or “fractured bone” refer to a partial or complete break in the continuity of a bone. The fracture can occur, for example, from an outside force or from a controlled surgical cut (osteotomy). The presently disclosed embodiments can be used to treat any type of bone fracture, including, but not limited to, a displaced fracture, a non-displaced fracture, an open fracture, a closed fracture, a hairline fracture, a compound fracture, a simple fracture, a multi-fragment fracture, a comminuted fracture, an avulsion fracture, a buckle fracture, a compacted fracture, a stress fracture, a compression fracture, spiral fracture, butterfly fracture, other fractures as described by AO Foundation coding, multiple fractures in a bone, and other types of fractures.
As used herein, the term “weakened bone” refers to a bone with a propensity toward a fracture due to a decreased strength or stability due to a disease or trauma. Some bone diseases that weaken the bones include, but are not limited to, osteoporosis, achondroplasia, bone cancer, fibrodysplasia ossificans progressiva, fibrous dysplasia, legg calve perthes disease, myeloma, osteogenesis imperfecta, osteomyelitis, osteopenia, osteoporosis, Paget's disease, and scoliosis. Weakened bones are more susceptible to fracture, and treatment to prevent bone fractures may be desirable.
As used herein, the term “photodynamic implant” refers to an expandable member of the present disclosure that is infused with a photodynamic (light curable) material and exposed to an appropriate frequency of light and intensity to cure the material inside the expandable member and form a rigid structure.
As used herein, the terms “bone restructuring” or “restructure” refer to positioning a fractured bone back to a substantially normal, anatomically-correct position (separation of the bone fragments) and/or shape as well as supporting or stabilizing a weakened bone. In an embodiment, a photodynamic implant of the present disclosure provides a template, mandrel or form for restructuring a fractured or weakened bone. That is, a photodynamic implant of the present disclosure acts as a template, mandrel or form over which the fragments of a fractured bone can be arranged to a substantially original position and/or to which the fragments can be secured in a substantially original position. In an embodiment, a photodynamic implant of the present disclosure acts as a template, mandrel or form to return a broken bone to its a substantially normal, anatomically-correct shape. In an embodiment, a photodynamic implant of the present disclosure acts as a template, mandrel or form to support or stabilize a weakened bone in its a substantially normal, anatomically-correct shape. In an embodiment, a photodynamic implant of the present disclosure is used to restructure a fractured bone by aiding in attachment of a broken-off portion of a bone to the intact portion of the bone. In an embodiment, a photodynamic implant of the present disclosure is used to add strength to a weakened bone to prevent further weakening or a potential fracture.
In an embodiment, the present device is used in a minimally invasive surgical procedure. The device can enter a minimally invasive incision or access hole of any suitable size. For example, the access hole is about 5 mm to about 6 mm in diameter or any other suitable dimensions. In an embodiment, an expanding reamer or burr is used to pass through the small access hole. When inserted, the reamer is opened up to create a larger hole in the bone.
In an embodiment, the maximum diameter of the larger portion of the expandable member 170 is at least 1.5 times larger than the maximum diameter of the smaller portion of the expandable member 170. In an embodiment, the maximum diameter of the larger portion of the expandable member 170 is at least two times larger than the maximum diameter of the smaller portion of the expandable member 170.
In an embodiment, shown in
In an embodiment, shown in
The various shapes of the expandable member 170 allow for different approaches during minimally invasive surgical treatment of weakened or fractured bones. For example, an expandable member 170 having a retrograde or antegrade shape can be used for repair of a weakened or fractured proximal humerus. The antegrade shape allows for placement of the portion of the expandable member 170 with the largest diameter at the bone location most in need of repair or stabilization, including above and below the surgical neck area. For example, in the case of a proximal humerus, the antegrade shape allows for an incision and entry point into the humeral head through or just lateral to the rotator cuff. The geometry of the retrograde shape is opposite to the antegrade shape. With the retrograde shape, the portion of the expandable member 170 with the largest diameter is placed at the distal end of the catheter 150. The retrograde shaped expandable member 170 having the largest diameter can be placed at the bone location most in need of repair or stabilization, including above and below the surgical neck area. When repairing a proximal humerus, the retrograde shape allows for distal placement through an incision and bone entry point at (1) the medial or lateral epicondyles or (2) between these condyles at the roof of the olecranon fossa. In an embodiment, a device includes a retrograde shape expandable member 170 and has a longer catheter 150 (for example, about 3-4 inches longer) due to the increased distance from the bone access hole to the surgical neck.
In an embodiment, the expandable member 170 is sufficiently shaped to fit within a space or a gap in a fractured or weakened bone. One or more radiopaque markers, bands or beads may be placed at various locations along the expandable member 170 and/or the flexible delivery catheter 150 so that components of the system 100 may be viewed using fluoroscopy.
In the embodiments shown in
As illustrated in
In an embodiment, a contrast material may be added to the light-sensitive liquid 165 without significantly increasing the viscosity. Contrast materials include, but are not limited to, barium sulfate, tantalum, or other contrast materials known in the art. The light-sensitive liquid 165 can be introduced into the proximal end of the flexible delivery catheter 150 and passes within the inner void 152 of the flexible delivery catheter 150 up into an inner cavity 172 of the expandable member 170 to change a thickness of the expandable member 170 without changing a width or depth of the expandable member 170. In an embodiment, the light-sensitive liquid 165 is delivered under low pressure via the syringe 160 attached to the second port 164. The light-sensitive liquid 165 can be aspirated and reinfused as necessary, allowing for thickness adjustments to the expandable member 170 prior to activating the light source 110 and converting the liquid monomer 165 into a hard polymer.
In an embodiment, the light-sensitive liquid may be provided as a unit dose. As used herein, the term “unit dose” is intended to mean an effective amount of light sensitive liquid adequate for a single session or treatment. By way of a non-limiting example, a unit dose of a light sensitive liquid of the present disclosure for expanding the expandable member 170 may be defined as enough light-sensitive liquid to expand the expandable member 170 to a desired shape and size. In an embodiment, the expandable member 170 is sufficiently shaped and sized to fit within a space or a gap in a fractured bone. The desired shape and size of the expandable member 170 may vary somewhat from patient to patient. Thus, a user using a unit dose may have excess light-sensitive liquid left over after the procedure. It is desirable to provide sufficient amount of light-sensitive liquid to accommodate even the above-average patient. In an embodiment, a unit dose of a light-sensitive liquid of the present disclosure is contained within a container.
In an embodiment, a unit dose of a light-sensitive liquid of the present disclosure is contained in an ampoule. In an embodiment, the light-sensitive liquid can be delivered under low pressure via a standard syringe attached to the second port 164. In an embodiment, the light-sensitive liquid can be delivered without use of a pump.
As illustrated in
Light-conducting fibers use a construction of concentric layers for optical and mechanical advantages. Suitable light-conducting fiber 140 can be made from any material, including, but not limited to, glass, silicon, silica glass, quartz, sapphire, plastic, combinations of materials, or any other material, and may have any diameter. In an embodiment, the light-conducting fiber may be made from a polymethyl methacrylate core with a transparent polymer cladding. The light-conducting fiber 140 has any suitable diameter. In an embodiment, the light-conducting fiber has a diameter between approximately 0.75 mm and approximately 2.0 mm. In some embodiments, the light-conducting fiber can have a diameter of about 0.75 mm, about 1 mm, about 1.5 mm, about 2 mm, less than about 0.75 mm or greater than about 2 mm.
In an embodiment, one or more light conducting fibers 140 are used. Using more than one light conducting fibers 140 may reduce the cure time of the light-sensitive liquid, particularly when used with larger expandable members 170. In an embodiment, a plurality of light conducting fibers 140 are positioned side-by-side or in parallel in the expandable member 170. In an embodiment, a plurality of light conducting fibers 140 are positioned serially with ends of adjacent light conducting fibers 140 aligned or abutting on another in an end to end fashion. For example, one light conducting fiber may be positioned in the distal portion of the expandable member and another light conducting fiber may be positioned in the proximal portion of the expandable member 170. In an embodiment, a plurality of light conducting fibers are positioned in a combination of parallel and serial positions, such as partially overlapping or any other suitable configuration. In an embodiment, a plurality of light conducting fibers can be attached to a single light source with a splitter, or can be attached to a plurality of light sources.
In an embodiment, when a plurality of light conducting fibers 140 are used, an inner lumen of a delivery catheter 150 has a larger inner diameter. In an embodiment, an inner lumen of the delivery catheter 150 has an inner diameter of about 1.8 mm. In an embodiment, an inner lumen of the delivery catheter is sized to contain a plurality of light conducting fibers 140. In an embodiment, a delivery catheter sized to contain a plurality of light conducting fibers 140 has an inner diameter of about 2.3 mm to about 3.0 mm.
In an embodiment, the light-conducting fiber 140 is made from a polymethyl methacrylate core with a transparent polymer cladding. It should be appreciated that the above-described characteristics and properties of the light-conducting fibers 140 are exemplary and not all embodiments of the present disclosure are intended to be limited in these respects. Light energy from a visible emitting light source can be transmitted by the light-conducting fiber 140. In an embodiment, visible light having a wavelength spectrum of between about 380 nm to about 780 nm, between about 400 nm to about 600 nm, between about 420 nm to about 500 nm, between about 430 nm to about 440 nm or any other suitable wavelengths, is used to cure the light-sensitive liquid.
The most basic function of a fiber is to guide light, i.e., to keep light concentrated over longer propagation distances despite the natural tendency of light beams to diverge, and possibly even under conditions of strong bending. In the simple case of a step-index fiber, this guidance is achieved by creating a region with increased refractive index around the fiber axis, called the fiber core, which is surrounded by the cladding. The cladding may be protected with a polymer coating. Light is kept in the “core” of the light-conducting fiber by total internal reflection. Cladding keeps light traveling down the length of the fiber to a destination. In some instances, it is desirable to conduct electromagnetic waves along a single guide and extract light along a given length of the guide's distal end rather than only at the guide's terminating face.
In some embodiments of the present disclosure, at least a portion of a length of a light-conducting fiber is modified, e.g., by removing the cladding, in order to alter the profile of light exuded from the light-conducting fiber. The term “profile of light” refers to, without limitation, direction, propagation, amount, intensity, angle of incidence, uniformity, distribution of light and combinations thereof. In an embodiment, the light-conducting fiber emits light radially in a uniform manner, such as, for example, with uniform intensity, along a length of the light-conducting fiber in addition to or instead of emitting light from its terminal end/tip. To that end, all or part of the cladding along the length of the light-conducting fiber may be removed. It should be noted that the term “removing cladding” includes taking away the cladding entirely to expose the light-conducting fiber as well as reducing the thickness of the cladding. In addition, the term “removing cladding” includes forming an opening, such as a cut, a notch, or a hole, through the cladding. In an embodiment, removing all or part of the cladding may alter the propagation of light along the light-conducting fiber. In another embodiment, removing all or part of the cladding may alter the direction and angle of incidence of light exuded from the light-conducting fiber.
In an embodiment, the expandable member 170 includes a head section 302, i.e. an enlarged upper section, that merges into a shaft section 304, i.e. a tapered or frusto-conical lower section. In an embodiment, the head section 302 tapers gradually to form the shaft section 304, which can extend from the head 312 into a shaft 316 of the bone 314. In an embodiment, the expandable member 170, including both the head section 302 and the shaft section 304, is configured to be contained in the space 310 within the head 312. In an embodiment, the shaft section 304 of the expandable member 170 extends for any desired distance into the shaft 316 of the bone 314. In an embodiment, the shaft section 304 of the expandable member 170 extends into the shaft 316 of the bone 314 for about 50 mm to about 300 mm.
As shown in
In an embodiment, the expandable member 170 can be round or oval for placement into the space 410 within the head 412 of the bone 414. It should be noted that the expandable member 170 may have any other shape suitable for placement into a head of a bone. Suitable additional shapes include, but are not limited to, a sphere, ovoid sphere, tapered cone, three-dimensional wedge whereby one axis is significantly wider than the other, with both tapering from a larger dimension to a smaller dimension, and similar. As discussed above, the expandable member 170 can be a tapered elongated shape such as an antegrade shape or a retrograde shape, as shown in
In an embodiment, the external surface of the expandable member 170 is resilient and puncture resistant. In an embodiment, the expandable member 170 is manufactured from a non-compliant (non-stretch/non-expansion) conformable material including, but not limited to, urethane, polyethylene terephthalate (PET), nylon elastomer and other similar polymers. In an embodiment, the expandable member 170 is manufactured from a polyethylene terephthalate (PET). In an embodiment, the expandable member 170 is manufactured from a radiolucent material, which permit x-rays to pass through the expandable member 170. In an embodiment, the expandable member 170 is manufactured from a radiolucent polyethylene terephthalate (PET). In an embodiment, the expandable member 170 is manufactured from a conformable compliant material that is limited in dimensional change by embedded fibers. In an embodiment, at least a portion of the external surface 174 of the expandable member 170 is substantially even and smooth. In an embodiment, at least a portion of the external surface of the expandable member 170 includes at least one textured element such as a bump, a ridge, a rib, an indentation or any other shape. In an embodiment, at least a portion of the external surface of the expandable member 170 protrudes out to form a textured element. In an embodiment, at least a portion of the external surface of the expandable member 170 invaginates to form a textured element. In an embodiment, the textured element increases the friction and improves the grip and stability of the expandable member 170 after the expandable member 170 is inserted into the fracture location. In an embodiment, the textured element results in increased interdigitation of bone-device interface as compared to an expandable member without textured elements. In an embodiment, the textured element can be convex in shape. In an embodiment, the textured element can be concave in shape. In an embodiment, the textured element can be circumferential around the width of the expandable member 170, either completely or partially.
In general, bone graft or bone graft substitute can be used in conjunction with an expandable member 170 of the present disclosure. In an embodiment, the bone graft is an allogeneic bone graft. In an embodiment, the bone graft is an autologous bone graft. In an embodiment, the bone graft substitute is a hydroxyapatite bone substitute. In an embodiment, a bone graft or bone graft substitute is used to fill in any gaps that may exist, for example, between the external surface of the expandable member 170 and the surfaces of the bone fragments. In an embodiment, a bone graft or bone graft substitute is used to fill any gaps that may exist, for example, between the textured element of the expandable member 170 and the surfaces of the bone fragments.
In general, the expandable member 170 can include an external surface that may be coated with materials including, but not limited to, drugs (for example, antibiotics), proteins (for example, growth factors) or other natural or synthetic additives (for example, radiopaque or ultrasonically active materials). For example, after a minimally invasive surgical procedure an infection may develop in a patient, requiring the patient to undergo antibiotic treatment. An antibiotic drug may be added to the external surface of the expandable member 170 to prevent or combat a possible infection. Proteins, such as, for example, bone morphogenic protein or other growth factors have been shown to induce the formation of cartilage and bone. A growth factor may be added to the external surface of the expandable member 170 to help induce the formation of new bone. Due to the lack of thermal egress of the light-sensitive liquid 165 in the expandable member 170, the effectiveness and stability of the coating is maintained.
In an embodiment, the expandable member 170 does not have any valves. One benefit of not having valves is that the expandable member 170 may be expanded or reduced in size as many times as necessary to assist in the fracture reduction and placement. Another benefit of the expandable member 170 not having valves is the efficacy and safety of the system 100. Since there is no communication passage of light-sensitive liquid 165 to the body there cannot be any leakage of liquid 165 because all the liquid 165 is contained within the expandable member 170. In an embodiment, a permanent seal is created between the expandable member 170 and the delivery catheter 150 that is both hardened and affixed prior to the delivery catheter 150 being removed.
In an embodiment, abrasively treating the external surface of the expandable member 170 for example, by chemical etching or air propelled abrasive media, improves the connection and adhesion between the external surface of the expandable member 170 and a bone surface. The surfacing significantly increases the amount of surface area that comes in contact with the bone which can result in a stronger grip.
The expandable member 170 can be infused with light-sensitive liquid 165 and the light-sensitive liquid 165 can be cured to form a photodynamic implant the photodynamic implant may be separated from the delivery catheter 150. As shown in
In an embodiment, the shape of the photodynamic implant corresponds to the shape of the expandable member 170. In various embodiment, the photodynamic implant can be pear-shaped, oval, round, elongated, tapered, and the like. Modification of light-sensitive liquid 165 infusion allows a user to adjust the span or thickness of expandable member 170 to provide specific photodynamic implant size and shape to each subject. In that the expandable member 170 is formable and shapeable by the user prior to the photocuring of the light-sensitive liquid 165 in the expandable member 170, the photodynamic implant best mirrors the size and shape of the area into which the expandable member 170 is implanted. In an embodiment, the photodynamic implant is configured to be at least partially placed into a space within a head of a bone. In an embodiment, the photodynamic implant is configured to be contained within a head of a bone. In an embodiment, the photodynamic implant is configured such that a distal section of the implant extends for a length into the shaft of the bone.
In an embodiment, the photodynamic implant formed by infusing and curing the light sensitive liquid 165 into the expandable member 170 is used for restructuring, aligning and/or stabilizing a bone. In an embodiment, the expandable member 170 can be infused with an amount of light-sensitive liquid 165 such that the final cured photodynamic implant has the size and shape to substantially return a broken head of a bone to its anatomical shape. In an embodiment, the expandable member 170 can be infused with an amount of light-sensitive liquid 165 such that the photodynamic implant has the size and shape such that a head of a bone can be restructured to a substantially original size and shape around the final cured photodynamic implant. In an embodiment, the expandable member 170 can be infused with an amount of light-sensitive liquid 165 such that the photodynamic implant facilitates a reduction of a fractured bone. In an embodiment, the size and shape of the photodynamic implant 510 attempts to maximize the surface contact area with the surrounding bone, minimizing specific points of concentrated pressure. The photodynamic implant may be sufficiently designed to provide high compressive strength, thus minimizing deformation under dynamic loading conditions.
In an embodiment, the expandable member is positioned and inflated to a size sufficient to provide maximum fill of the cavity of the bone, such as an intramedullary canal, at the region of the fracture or weakened bone. The expandable member is inflated to any suitable size. In an embodiment, the expandable member is inflated up to about 20 mm in diameter.
In an embodiment, bone fixation implants including, but not limited to, screws and other suitable mechanisms are anchored into the cured expandable member or the photodynamic implant at the surgeons desired locations based on the fracture pathology and not the location of pre-determined locking holes. In an embodiment, the photodynamic implant are of a sufficiently large size to provide for a significant anchor and target above and below the fracture site for placement of multiple bone fixation implants including support cross-locking screws and any other suitable mechanisms.
A guidewire 608 may be introduced into the bone 605 via the access hole 610 and advanced through the intramedullary cavity 615 of the bone 602 to a rounded head 609 of the bone 602. The expandable member 170 of the system 100 is then delivered over the guidewire 608 to be placed within the head 609 of the bone 602. The location of the expandable member 170 may be determined using at least one radiopaque marker 615 which is detectable from the outside or the inside of the bone 602. Once the expandable member 170 is in the correct position within the head 609, the light-sensitive liquid 165 is then infused into the expandable member 170 to cause the expandable member 170 to expand to a desired size and shape, as described above.
The light-sensitive liquid 165 can be cured inside the expandable member 170 using the light-conducting fiber 140, as shown in
In an embodiment, an expandable member 170 is filled with the cured light-sensitive liquid 165 that is released from the delivery catheter 150 to form a photodynamic implant inside the head 609 of the bone 602, as shown in
In an embodiment, the photodynamic implant provides rotational stability by contouring to the cavity of the bone without the need for a significant number of locking screws or other bone fixation mechanisms, though such mechanisms may be used. Also, the expandable member is of a sufficient size to provide bending stability.
In an embodiment, a bone implant system 100 of the present disclosure is used to treat a fractured or weakened proximal humerus. In general, proximal humeral fractures are classified based on the number and type of major fragments. For example, a two-part fracture is typically a humeral neck fracture, separating the head of the humerus from the shaft of the humerus. More complicated fractures are three-part and four-part fractures. Three-part proximal humerus fractures can involve, for example, separation of greater tuberosity and humeral neck. Four-part fractures typically involve articular surface of the head and head splitting fractures. In an embodiment, a photodynamic implant of the present disclosure can be used to treat two-part, three-part, or four-part fractures of the proximal humerus. In an embodiment, a photodynamic implant of the present disclosure can be used to realign, restructure, stabilize or support the shaft of the humerus, greater tuberosity, humeral neck, articular surface of the head and head splitting fractures. In an embodiment, a photodynamic implant of the present disclosure can be used to stabilize a weakened humeral head, neck, shaft or other portions of humerus.
In an embodiment, access to the intramedullary cavity of a humerus can be obtained by either retrograde approach or an antegrade approach as described above. It should be noted that the orientation of the expandable member relative to the delivery catheter will change depending on the chosen approach. The expandable member 107 is placed within a space of cancellous bone near the top of the humeral head. Once the expandable portion 107 is in the correct position within the humerus, the expandable portion 107 is filled with the light-sensitive liquid 165, which is then cured resulting in the photodynamic implant 510. In an embodiment, the bone implant system 100 is used to treat a humeral neck fracture, separating the head of the humerus from the shaft of the humerus. The addition of the light-sensitive liquid 165 to the expandable member 170 causes the expandable member to expand. As the expandable member 170 is expanded by the entering light-sensitive liquid 165, the fracture of the humeral neck is reduced. Once orientation of the bone fragments is confirmed to be in a desired position, the light-sensitive liquid 165 can be cured to form the photodynamic implant 510, which can then be separated from the delivery catheter. In an embodiment, the photodynamic implant 510 is used to treat a three-part fracture or a four-part fracture of a humeral head. In an embodiment, the photodynamic implant 510 acts as a filler, mandrel or support element for fragments of the humeral head. In an embodiment, the photodynamic implant 510 fills the space within the humeral head to substantially return the hemural head to its anatomical shape. In an embodiment, fractured bone fragments can be placed over the photodynamic implant 510 to return the fragments to their respective substantially original, anatomical positions. In an embodiment, broken fragments can be secured in their respective substantially, original position by attaching the broken fragments to the photodynamic implant by bone fixation implants, such as bone screws, nails, pins and rods, among others. In an embodiment, the photodynamic implant 510 extends into the shaft of the humerus or is attached to another implant that extends into the shaft of the humerus to provide additional stability to the bone for the duration of the healing process.
In an embodiment, a bone implant system 100 of the present disclosure is used to treat a proximal femoral fracture, such as a femoral neck fracture. In an embodiment, a bone implant system 100 of the present disclosure is used to treat or stabilize a weakened femoral head.
As shown in
In an embodiment, the present device includes a series of small interlocking metallic or plastic tubes that are inserted into the cavity of the bone, such as the medullary canal. In an embodiment, the series of tubes are used instead of or in addition to the use of the catheter The tubes are made from any suitable material including, but not limited to, a metal or a plastic. The tubes are interlocked sequentially to adjacent tubes such that the addition of the each incremental tube lengthens the entire tube.
In an embodiment, the tubes are slid over a mandrel and then locked or engaged to an adjacent tube in an end to end fashion. The interlocking mechanism of the sequential tubes is flexible so that the tubes can accommodate curvatures and deflections within the cavity of the bone. Since the series of tubes are flexible, the series of tubes are able to transit the length of the cavity of the bone without being obstructed within the canal as would a rigid length of tubing. Also, because the tube is flexible, a larger diameter tube or series of tubes may be interlocked and used within the cavity of a bone. A rigid tube would need to have a smaller diameter to navigate the deflections and curvatures within a cavity of a bone. The interlocking tubes may be of different diameters such that the tubes can accommodate different diameters and tapers within the cavity of the bone.
In an embodiment, once the tubes are all interlocked, the photodynamic monomer and the expandable member are inserted into and through the tube, the expandable member is inflated, and the photodynamic monomer is cured within the confines of the tube. In an embodiment, the use of the series of tubes and the monomer disposed within the series of tubes provides a stronger photodynamic implant.
It should be noted that although the present disclosure has been described with respect to treating fractures of the humerus and femur, those skilled in the art will recognize that the presently disclosed embodiments and methods can be used to treat other bones in the body, including but not limited to, a fractured or weakened tibia, fibula, ulna, radius, metatarsals, metacarpals, phalanx, phalanges, ribs, spine, vertebrae, clavicle and other bones.
In an embodiment, a device for restructuring or stabilizing a fractured or weakened head of a bone includes a delivery catheter having an elongated shaft with a proximal end, a distal end, and a longitudinal axis therebetween, the delivery catheter having an inner void for passing at least one light sensitive liquid, and an inner lumen; an expandable member releasably engaging the distal end of the delivery catheter, the expandable member moving from a deflated state to an inflated state when the at least one light sensitive liquid is passed to the expandable member; wherein the expandable member is sufficiently designed to be at least partially placed into a space within a head of a bone, and a light conducting fiber sized to pass through the inner lumen of the delivery catheter and into the expandable member, wherein, when the light conducting fiber is in the expandable member, the light conducting fiber is able to disperse the light energy to initiate hardening of the at least one light sensitive liquid within the expandable member to form a photodynamic implant.
In an embodiment, a method for repairing or stabilizing a fractured or weakened head of a bone includes placing a expandable member removably attached to a distal end of a delivery catheter into at least partially into a space within a head of a bone, infusing a light sensitive liquid into the expandable member through an inner lumen of the delivery catheter, inserting a light conducting fiber into the expandable member through an inner void of the delivery catheter, and activating the light conducting fiber to cure the light sensitive liquid inside the expandable member, thereby forming a photodynamic implant inside the head of the bone which serves as a mandrel or form for repair and stabilization of the head of the bone.
In an embodiment, a kit for repairing or stabilizing a fractured or weakened head of a bone includes an light conducting fiber; a unit dose of at least one light sensitive liquid; and a delivery catheter having an elongated shaft with a proximal end, a distal end, and a longitudinal axis therebetween, wherein the delivery catheter has an inner void for passing the at least one light sensitive liquid into a expandable member releasably engaging the distal end of the delivery catheter, and an inner lumen for passing the light conducting fiber into the expandable member, wherein the expandable member is sufficiently designed to be at least partially placed into a space within a head of a bone. In an embodiment, the kit includes a plurality of expandable members of different sizes or shapes. In an embodiment, the kit includes a light source.
In an aspect, a device for restructuring or stabilizing a fractured or weakened head of a bone includes: a delivery catheter having an elongated shaft with a proximal end, a distal end, and a longitudinal axis therebetween, an inner void for passing at least one light sensitive liquid, and an inner lumen; an expandable member releasably engaging the distal end of the delivery catheter; and a light conducting fiber sized to pass through the inner lumen of the delivery catheter and into the expandable member. The expandable member is capable of moving from a deflated state to an inflated state when the at least one light sensitive liquid is passed to the expandable member. The expandable member is sufficiently designed to be at least partially placed into a space within a head of a bone. When the light conducting fiber is in the expandable member, the light conducting fiber is able to disperse the light energy to initiate hardening of the at least one light sensitive liquid within the expandable member to form a photodynamic implant
In one aspect, a method for repairing or stabilizing a fractured or weakened head of a bone includes: placing an expandable member removably attached to a distal end of a delivery catheter at least partially into a space within a head of a bone; infusing a light sensitive liquid into the expandable member through an inner lumen of the delivery catheter; inserting a light conducting fiber into the expandable member through an inner void of the delivery catheter; and activating the light conducting fiber to cure the light sensitive liquid inside the expandable member to form a photodynamic implant inside the head of the bone. In an embodiment, the expandable member has a tapered elongated shape.
In one aspect, a kit for repairing or stabilizing a fractured or weakened head of a bone includes: a light conducting fiber; at least one light sensitive liquid; a delivery catheter having an elongated shaft with a proximal end, a distal end, and a longitudinal axis therebetween, an inner void, and an inner lumen; and an expandable member releasably engaging the distal end of the delivery catheter. The expandable member is sufficiently designed to be at least partially placed into a space within a head of a bone. The delivery catheter has an inner void for passing the at least one light sensitive liquid into the expandable member, and an inner lumen for passing the light conducting fiber into the expandable member. In an embodiment, the kits includes a plurality of expandable members of different sizes or shapes. In an embodiment, the kit includes a light source.
All patents, patent applications, and published references cited herein are hereby incorporated by reference in their entirety. It will be appreciated that several of the above-disclosed and other features and functions, or alternatives thereof, may be desirably combined into many other different systems or application. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may be subsequently made by those skilled in the art.
This application claims the benefit of and priority to U.S. Provisional Patent Application No. 61/509,391, filed on Jul. 19, 2011, U.S. Provisional Patent Application No. 61/509,314, filed on Jul. 19, 2011, and U.S. Provisional Patent Application No. 61/509,459, filed on Jul. 19, 2011, the entirety of these applications are hereby incorporated herein by reference.
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