WO1994004085A2 - Antibiotic eluding intramedulary nail apparatus - Google Patents
Antibiotic eluding intramedulary nail apparatus Download PDFInfo
- Publication number
- WO1994004085A2 WO1994004085A2 PCT/US1993/007869 US9307869W WO9404085A2 WO 1994004085 A2 WO1994004085 A2 WO 1994004085A2 US 9307869 W US9307869 W US 9307869W WO 9404085 A2 WO9404085 A2 WO 9404085A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bone
- antibiotic
- invention according
- medullary canal
- fractured
- Prior art date
Links
- 230000003115 biocidal effect Effects 0.000 title claims abstract description 142
- 210000000988 bone and bone Anatomy 0.000 claims abstract description 176
- 150000001875 compounds Chemical class 0.000 claims abstract description 81
- 239000003242 anti bacterial agent Substances 0.000 claims abstract description 45
- 241000894006 Bacteria Species 0.000 claims abstract description 20
- 206010052428 Wound Diseases 0.000 claims abstract description 19
- 208000015181 infectious disease Diseases 0.000 claims abstract description 18
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- 229940127089 cytotoxic agent Drugs 0.000 claims abstract description 8
- 210000002082 fibula Anatomy 0.000 claims abstract description 8
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- ULGZDMOVFRHVEP-RWJQBGPGSA-N Erythromycin Chemical compound O([C@@H]1[C@@H](C)C(=O)O[C@@H]([C@@]([C@H](O)[C@@H](C)C(=O)[C@H](C)C[C@@](C)(O)[C@H](O[C@H]2[C@@H]([C@H](C[C@@H](C)O2)N(C)C)O)[C@H]1C)(C)O)CC)[C@H]1C[C@@](C)(OC)[C@@H](O)[C@H](C)O1 ULGZDMOVFRHVEP-RWJQBGPGSA-N 0.000 claims description 12
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- -1 vancomicyn Chemical compound 0.000 claims description 7
- CEAZRRDELHUEMR-URQXQFDESA-N Gentamicin Chemical compound O1[C@H](C(C)NC)CC[C@@H](N)[C@H]1O[C@H]1[C@H](O)[C@@H](O[C@@H]2[C@@H]([C@@H](NC)[C@@](C)(O)CO2)O)[C@H](N)C[C@@H]1N CEAZRRDELHUEMR-URQXQFDESA-N 0.000 claims description 6
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- RJQXTJLFIWVMTO-TYNCELHUSA-N Methicillin Chemical compound COC1=CC=CC(OC)=C1C(=O)N[C@@H]1C(=O)N2[C@@H](C(O)=O)C(C)(C)S[C@@H]21 RJQXTJLFIWVMTO-TYNCELHUSA-N 0.000 claims description 6
- 229960000723 ampicillin Drugs 0.000 claims description 6
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- NLVFBUXFDBBNBW-PBSUHMDJSA-N tobramycin Chemical compound N[C@@H]1C[C@H](O)[C@@H](CN)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O[C@@H]2[C@@H]([C@@H](N)[C@H](O)[C@@H](CO)O2)O)[C@H](N)C[C@@H]1N NLVFBUXFDBBNBW-PBSUHMDJSA-N 0.000 claims description 5
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/72—Intramedullary pins, nails or other devices
- A61B17/7283—Intramedullary pins, nails or other devices with special cross-section of the nail
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/72—Intramedullary pins, nails or other devices
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
- A61L31/14—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
- A61L31/16—Biologically active materials, e.g. therapeutic substances
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M37/00—Other apparatus for introducing media into the body; Percutany, i.e. introducing medicines into the body by diffusion through the skin
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/39—Markers, e.g. radio-opaque or breast lesions markers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2300/00—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices
- A61L2300/40—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices characterised by a specific therapeutic activity or mode of action
- A61L2300/404—Biocides, antimicrobial agents, antiseptic agents
- A61L2300/406—Antibiotics
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2300/00—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices
- A61L2300/40—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices characterised by a specific therapeutic activity or mode of action
- A61L2300/416—Anti-neoplastic or anti-proliferative or anti-restenosis or anti-angiogenic agents, e.g. paclitaxel, sirolimus
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2300/00—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices
- A61L2300/60—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices characterised by a special physical form
- A61L2300/602—Type of release, e.g. controlled, sustained, slow
Definitions
- the present invention relates to bone fixa ⁇ tion devices, and, more particularly, to an antibi ⁇ otic eluding intramedullary nail apparatus and method of fabricating an antibiotic carrier compound and applying same to the intramedullary nail.
- the apparatus may be used for the intramedullary fixa ⁇ tion of fractured long bones, such as femurs, tib- ias, fibulas, humeri, ulnas and radii, as well as in other orthopedic and bone reconstructive procedures, such as tumors, and, in particular fractures associ ⁇ ated with an open wound exposing surrounding soft tissue and the medullary canal of the fractured bone to bacteria and other infectious micro-organisms.
- Fractures of the femur, tibia, fibula, as well as humeri, ulnas and radii are common injuries the treatment of which is typically dependent upon the cause of the -injury, the exact nature of the fracture, the delay in receiving treatment and the presence of, or potential for, infection.
- fractures in immunocompromised and bone tumor patients often require special treatment to repair and/or prevent fractures.
- the present invention offers an opportunity to not only treat the fracture but further may be utilized to provide supplemental treatment by dispensing antibiotic or chemotherapeu- tic agents.
- a favored method of treatment of fractures of long bones is intramedullary fixation.
- Intramedul ⁇ lary fixation involves the use of an intramedullary nailing system wherein an intramedullary nail or rod is surgically inserted within the medullary canal of the fractured bone and held in place through the use of pins or screws inserted through the opposing ends of the intramedullary nail. Once properly inserted, the intramedullary nail will function as a mechani- cal strut, or splint, which facilitates the natural union of the fractured bone by minimizing forces that would otherwise disrupt the union of the frac ⁇ tured bone.
- An alternative method of treatment relies upon the use of external fixators.
- stabilizing rods are positioned external to the limb and in alignment with the fractured bone.
- the external stabilizing rods are held in position by fastening them to fixtures secured to the fractured limb above and below the location of the fracture.
- external fixators have the potential disadvantage of being somewhat less stable than intramedullary rods due, in part, to external fixa ⁇ tors being weight bearing versus being weight shar- ing, thus sometimes permitting the bone to shift resulting in an imperfect union or non-union of the bone at the point or points of fracture.
- Internal fixation devices such as intramedullary nails, typically offer increased stability of long bone fractures.
- perioperative antibiotic therapy is usually adminis ⁇ tered systemically for three to five days following insertion of the nail and sometimes includes the application of antibiotic irrigation at the time of surgery — all in an attempt to "reduce” the surviv ⁇ ing population of reproducing bacterial cells that escaped debridement.
- antibiotics are not easily administered within the medullary canal of the fractured bone after it has been set with, or without, an intramedullary nail. Accordingly, any viable bacteria can result in severe complications to the patient.
- the "antibiot ⁇ ic bone cement” mixture is occasionally applied to the fractured bone and used to "artificially” cement the fractured bone together. As the cemented bone heals, the antibiotic will exude from the bone cement for a predetermined amount of time — thus enabling some exposure of the antibiotic within the medullary canal, albeit limited to the area immedi ⁇ ately proximate to the point of fracture.
- Antibiotic bone cement mixtures have been formed immediately prior to surgery into beads strung together on surgical grade wire.
- the string of "antibiotic beads” may thus be inserted into an open wound (which may have been caused by a bone fracture, or even from an incision during surgery) , wherein the desired antibiotic is capable of release from the hardened cement after such inser ⁇ tion.
- antibiotic beads most always must be removed from the patient due to the risk that the beads may become dislodged and migrate from the point of insertion.
- a further prior art use of mixtures of anti ⁇ biotics and bone cement is in connection with total joint arthoplasty, e.g. hip replacement.
- the bone cement is used primarily for its cement - structural property where the inclusion of an antibiotic serves to mitigate or fight a present infection minimizing the opportunity for infection to cause a mechanical failure of the implant.
- the present invention comprises an antibiotic eluding intramedullary nail apparatus for use in association with the intramedullary fixation of fractured long bones, such as fractured femurs, tibias, fibulas, humeri, ulnas and radii, having a medullary cavity, wherein the fracture may be asso ⁇ ciated with an open wound, which in turn, may expose the medullary cavity within the fractured bone, as well as the soft tissue surrounding the open wound, to bacteria and/or other infectious micro-organisms which could result in morbidity as well as mortali ⁇ ty.
- fractured long bones such as fractured femurs, tibias, fibulas, humeri, ulnas and radii
- fractured long bones such as fractured femurs, tibias, fibulas, humeri, ulnas and radii
- fractured long bones such as fractured f
- the present invention has further application in treating failed total hip and knee arthoplasty, infected non-unions and malunions, osteomyelitis, fractures in immunocompromised patients, as well as treating pathologic fractures with chemotherapeutic agents caused by tumors which have weakened the bone.
- the antibiotic eluding intramedullary nail apparatus comprises means for stabilizing the frac ⁇ tured bone in an aligned position.
- the bone stabilizing means comprises an intramedullary nail having a first end, a second end and an exterior surface, wherein only a portion of the exterior surface of the intramedullary nail is in juxtaposition with at least a portion of the interior surface of medullary cavity of the fractured bone.
- the distal end of the intramedullary nail may further be tapered and/or flexible to facilitate insertion into the medullary canal of the fractured long bone.
- the antibiotic eluding intramedullary nail apparatus further includes bactericidial means for inhibiting the growth of and/ or destroying bacteria , the continued presence of which may result in an infection in the medullary cavity of the fractured bone as well as the soft tissue proximate the frac- ture .
- the bactericidal means is combined with a carrier means to form an antibiotic compound which is , in turn, secured to the intramedullary nail .
- the carrying means preferably consists of a material which is not only biocompatible, but which will also facilitate exudation of the bactericidal means towards inhibiting the growth of and destroy ⁇ ing bacteria .
- the antibiotic carri ⁇ er compound may be secured to the intramedullary nail either immediately before its use in a surgical procedure or well in advance such that the completed assembly may be handled in a "ready-to-use” fashion .
- chemothera ⁇ Pelic agents could be combined with , and/or re- place , a bactericidal compound in cases of a bone tumor .
- the bone stabilizing means In use , the bone stabilizing means together with the antibiotic carrier compound is inserted within the medullary cavity of the fractured bone where the bactericidal means for inhibiting the growth of and destroying bacteria will continuously exude from the carrier means for at least a prede ⁇ termined period of time following insertion and closure of the wound.
- the bone stabilizing means has a star-like transverse cross- sectiona l conf iguration .
- This star- l ike shape includes a plurality of points and corresponding "v- shaped" depressions between adj acently positioned ones of the points .
- the antibiotic carrier compound is positioned below at least two adjacently positioned ones of the points so as to preclude direct contact of the carrier means with the interior surface of the medullary cavity of the fractured bone after the bone stabilizing means has been positioned within the medullary cavity.
- the bone stabilizing means has one or more grooves which are integrally formed within the exterior surface. These grooves may be positioned in substantially parallel alignment with the longitudinal axis of the bone stabilizing means or they may be positioned in concentric alignment with the longitudinal axis. Of course, other orientations of the grooves are also contemplated.
- the antibiotic carrier compound is operably positioned within at least a portion of the one or more grooves so as to preclude direct contact of the carrier means with the medullary cavity of the fractured bone after the bone stabilizing means has been operably positioned within the medullary cavity.
- These grooves may be of virtually any shape, though they are contemplated as being either "U” shaped or "C” shaped, wherein "C” shaped groves may serve to retain the antibiotic compound in place.
- the bone stabilizing means comprises a hollow shaft having an internal region defined by an interior surface.
- the hollow shaft has one or more apertures depending from the internal region and extending through the interior surface and the exterior surface.
- the antibiotic carrier compound is positioned within the internal area so as to preclude direct contact of the carrier means with the medullary cavity of the fractured bone. Accordingly, the apertures enable directed exudation of the means for inhibiting and destroying bacteria from the carrier means to the medullary cavity.
- the bone stabilizing means may include an opening depending from the internal region and extending through the interior surface and the exterior surface and extending longitudinally from the first end to the second end of the bone stabi ⁇ lizing means to permit the bone stabilizing means to flex thereby facilitating its insertion into the medullary canal.
- the antibiotic compound means may be formed of a segmented rod to permit flexing to preclude splitting or breaking of the antibiotic compound means during insertion into the medullary canal.
- the antibiotic compound means positioned within the internal area of the hollow shaft may be cannulated to permit passage of a guide wire toward facilitating insertion of the apparatus into the medullary canal.
- the bactericidal means is contemplated as being selected from the group of antibiotics consisting of gentamicin, tobramycin, erythromycin, vancomicyn, oxacillin, cloxacillin, methicillin, lincomycin, ampicillin, and colistin although others may be used.
- the carri ⁇ er means further includes an ingredient such as barium sulfate which serves to render the carrier means radio opaque.
- the antibiotic compound means which is secured to at least a portion of the bone stabilizing means is formed so as to have an irregular external surface thereby increasing the surface area of said antibi- otic compound means to, in turn, increase the degree to which said bactericidal means is released from the antibiotic compound means.
- the antibiotic com ⁇ pound means may for example be formed into a plural ⁇ ity of spherical shaped elements thereby increasing the surface area of said antibiotic compound means to, in turn, increase the degree to which said bactericidal means is released from said antibiotic compound means.
- the present antibiotic eluding intramedullary nail apparatus may further include a retaining means affixed to the bone stabilizing means proximate to the antibiotic compound means to retain any portion of said antibiotic compound means which becomes dislodged from the bone stabilizing means either during insertion of the apparatus into the medullary canal or subsequent to implantation.
- the bone stabilizing means may be cannulated to permit passage of a guide wire toward facilitat- ing insertion of the apparatus into the medullary canal.
- the bone stabilizing means may be formed of a malleable material.
- the carrier means comprises bone cement. Such bone cement is commercially available and may be formu ⁇ lated from polymethlmethacrylate (PMMA) .
- the bactericidal means for inhibiting the growth of and destroying bacteria may be combined with the bone cement by uniform saturation and/or impregnation.
- the bone cement be selected from the group consist ⁇ ing of cement compounds which facilitate exudation of antibiotics or, other medications, prior to substantial curing of the cement.
- the present invention further comprises a method of fabricating an antibiotic eluding intrame ⁇ dullary nail apparatus for use in the intramedullary fixation of fractured long bones, such as femurs, tibias and fibulas, and, in particular fractures associated with an open wound exposing the soft tissue and medullary canal of the fractured bone to bacteria and other infectious micro-organisms.
- the method comprises the steps of first utilizing a bone stabilizing element having an exterior surface and one or more depressed regions extending below the exterior surface of the bone stabilizing element, combining an antibiotic agent with a carrier agent so as to form an antibiotic compound, the carrier agent being of the type which allows for release of the antibiotic agent after the antibiotic compound has substantially cured.
- the antibiotic compound is then applied to at least a portion of the one or more depressed regions extending below the exterior surface of the shaft and the antibiotic compound is allowed to substantially cure.
- the shaft has a plurality of points and correspond- ing "v-shaped" depressions extending below and between adjacently positioned ones of the points.
- the antibiotic carrier compound is then applied adjacent one or more of the plurality of "v-shaped" depressions, and, in turn, below corresponding ones of the points.
- the shaft has an interior surface which defines an internal region, and, one or more apertures depend ⁇ ing from the internal region. The apertures extend through an adjacent portion of the interior and exterior surfaces.
- the antibiotic carrier compound is then applied within the internal region adjacent at least one of the one or more apertures.
- the present invention is further contemplated for use with immunocompromised and bone tumor pa ⁇ tients wherein chemotherapeutic agents may be mixed with the bone cement, secured to the bone stabiliz ⁇ ing means and inserted into the medullary canal.
- chemotherapeutic agents may be mixed with the bone cement, secured to the bone stabiliz ⁇ ing means and inserted into the medullary canal.
- chemotherapeutic agents may be eluded within the canal toward providing additional treatment toward treating pathologic fractures or preventing such a fracture.
- the present invention may be used to provide treatment between the time the failed prosthesis is removed and a replacement provided.
- a form of the invention may be inserted into the medullary canal after the hip or knee prosthesis has been removed so as to provide for the application of antibiotic agents directly within the medullary canal thereby providing superior performance over beads which are difficult to place deep within the canal and diffi ⁇ cult to remove.
- the invention may be removed from the canal and the replacement prosthe ⁇ sis re-inserted.
- Fig. 1 is a perspective view of an embodiment of the present antibiotic eluding intramedullary nail apparatus
- Fig. la is a schematic developmental view of the present invention, showing in particular, the forma ⁇ tion of the antibiotic compound and its positioning on the intramedullary nail;
- Fig. 2 is an elevated cross-sectional view of the embodiment shown in Fig. 1, as operably inserted within the medullary canal of a fractured long bone;
- Fig. 3 is a cross-sectional view taken generally along lines 3-3 of Fig. 2;
- Fig. 4 is a perspective view of an embodiment of the present invention
- Fig. 5 is a cross-sectional view taken generally along lines 5-5 of Fig. 4;
- Fig. 6 is a fragmentary view of an embodiment of the present invention.
- Fig. 7 is a fragmentary view of an embodiment of the present invention.
- Fig. 8 is a fragmentary view of an embodiment of the present invention. Best Mode For Carrying Out The Invention
- Antibiotic eluding intramedullary nail appa ⁇ ratus 10 is shown in Fig. 1 as comprising bone stabilizing means 15 to which is secured antibiotic compound 20 in forms 20a, 20b and 20c.
- Bone stabi ⁇ lizing means 15 is shown including first end 21, second end 22 and exterior surface 23.
- Bone stabi ⁇ lizing means 15 is further shown to be cannulated, i.e. possessing a hollow passage 24 extending from the first end 21 to the second end 22 capable of accepting passage of a guide wire as sometimes used to facilitate insertion of bone stabilizing means 15 into the medullary canal 50 (Fig. 3) .
- bone stabilizing means 15 comprises and is illustrated having a star-shaped cross-sectional configuration comprising a plurali ⁇ ty of points 25 through 29, and a plurality of "v- shaped" depressions 31 through 35 — each of which regions are positioned between and extend below two adjacent ones of the points.
- bone stabilizing means 15 is shown in a magnified configuration having a five pointed star configuration while in practice it may, for example, include twenty or more points each with a smaller peak-to-valley dimension.
- bone stabilizing means 15 is shown as having a star- shaped configuration other shapes, such as cylindri ⁇ cal, clover, and other substantially symmetrical, as well as non-symmetrical configurations are also contemplated. Furthermore, it is also contemplated that bone stabilizing means 15 may be constructed from any commercially acceptable biocompatible alloy and/or composite material which is substantially torsionally rigid and which possesses relatively heavy load-bearing capabilities. Alternatively, the bone stabilizing means 15 may be constructed from a malleable material to permit some limited flexing to facilitate its insertion into the medullary canal 50. Antibiotic compound 20 is shown in Fig.
- bactericidal means 45 an antibiotic selected from the group including but not limited to gentamicin, tobramycin, erythromycin, vancomicyn, oxacillin, cloxacillin, methicillin, lincomycin, ampicillin, or colistin, for inhibiting the growth of and/or destroying bacteria, and carrier means 40 for sustainably releasing bactericidal means 45 into the medullary canal.
- bactericidal means 45 may further include or be replaced with a chemotherapeu ⁇ tic agent for treating cancerous cells and bone tumors.
- antibiotic compound 20 may be formed with varying surface configura ions to maxi ⁇ mize or otherwise control the release of bacterici ⁇ dal means 45.
- Antibiotic compound 20a is shown having a smooth surface 20a while antibiotic com- pound 20b is shown having an irregular "mounded" surface 20b. Other surface configurations, such as corrugated or rippled are deemed within the scope of the present invention.
- antibiotic compound 20 may be formed of beads 20c thereby maximizing the surface area of the compound exposed within the medullary canal 50.
- the beads 20c may be individually formed and thereafter disposed upon bone stabilizing means 15 prior to fully curing toward their retaining their position upon the bone stabilizing means 15.
- a retaining means 16 (Fig. 3) is shown positioned over antibiot ⁇ ic compound 20c and affixed to bone stabilizing means 15 by inserting the ends into a groove formed into bone stabilizing means 15 toward serving to retain any beads which may become dislodged from their predisposed position.
- Retaining means 16 may comprise any suitable biocompatible material.
- the antibiotic compound 20 may be affixed to bone stabi- lizing means 15 by action of bone cement.
- the surface of bone stabilizing means 15 which is to accept antibiotic compound 20 may alternatively be "roughened” to provide a better adherence.
- an adhesive may be used to affix the antibi- otic compound 20 to bone stabilizing means 15 if necessary.
- bactericidal means 45 comprises an antibiotic and it is contemplated that any suitable antibiotic may be used including but not limited to gentamicin, tobra ⁇ mycin, erythromycin, vancomicyn, oxacillin, cloxa ⁇ cillin, methicillin, lincomycin, ampicillin, colis ⁇ tin, among others.
- antibiotics including but not limited to gentamicin, tobra ⁇ mycin, erythromycin, vancomicyn, oxacillin, cloxa ⁇ cillin, methicillin, lincomycin, ampicillin, colis ⁇ tin, among others.
- carrier means 40 preferably consists any conventional biocom ⁇ patible bone cement, such as polymethylmethacrylate (PMMA) , which will reliably mix with antibiotics.
- PMMA polymethylmethacrylate
- Carrier means 40 and bactericidal means 45 are mixed with each other in order to form antibiot ⁇ ic compound 20.
- antibiotic compound 20 is prepared, se ⁇ cured to bone stabilizing means 15 and allowed to fully cure well in advance of its use in a surgical procedure such that apparatus 10 may be handled as a "ready-to-use" product.
- Varying concentrations of bactericidal means 45 may be used such that appara ⁇ tus 10 may be made available in different formula ⁇ tions.
- antibi- otic compound 20 may be prepared by the surgeon on a "custom basis" just prior to its use whereby the concentration of bactericidal means may be tailored to the individual patents needs.
- Bactericidal means may be combined with or replaced by a chemotherapeu- tic agent to provide treatment of bone tumors or other cancerous conditions.
- Fig. 2 and Fig. 3 of the drawings illustrate the present antibiotic eluding intramedullary nail apparatus 10 positioned within medullary canal 50 of fractured bone 51.
- anti- biotic compound 20 is positioned on bone stabilizing means 15 at a portion below corresponding ones of points 25 through 29, intentionally out of direct contact with the interior surface of medullary canal 50.
- antibiotic com ⁇ pound 20 does not protrude above the outer most surface of the bone stabilizing means 15 so as to preclude sheering forces from bearing upon antibiot ⁇ ic compound 20 which may otherwise dislodge the compound from the bone stabilizing means 15.
- such a construction may further preclude the antibiotic compound 20 from cementing bone stabilizing means 15 in position within the medullary canal 50.
- such spaced apart positioning will facilitate exudation of the antibi ⁇ otic from the bone cement 45 and migration of the antibiotic 40 within the localized area proximate to the fracture 52.
- Pins/screws 53 are shown fixing bone stabilizing means 15 in place within medullary canal 50. Any adhering of stabilizing means 15 to medullary canal 50 could result in the inability to remove antibiotic eluding intramedullary nail appa- ratus 10, as is often desirable after the bones of younger patients have healed.
- bone stabilizing means 15 may be curved or otherwise formed to match the shape of the bone and/or the medullary canal.
- Four alternative embodiments of the antibiot ⁇ ic eluding intramedullary nail apparatus are shown in Fig. 4 through Fig. 8.
- antibiotic eluding intramedullary nail apparatus 60 is shown in Fig. 4 and Fig. 5 as comprising bone stabilizing means 65 having an open internal region 68 into which antibiotic compound means 20 is disposed.
- Bone stabilizing means 65 includes exterior surface 66, interior surface 67, internal region 68 which is defined by interior surface 67, first end 69, second end 70 and a plurality of apertures, such as aper ⁇ tures 72 through 77.
- bone stabilizing means 65 optional ⁇ ly includes a gap 64 extending longitudinally from the first end 69 to the second end 70. As shown more clearly in Fig. 5, each of the apertures, such as apertures 72 and 73, depend from internal region 68 and extend through and past interior surface 67 and exterior surface 66.
- Antibiotic compound 20d formulated in the manner previously described, is shown positioned within internal region 68 of bone stabilizing means 65 and is further shown to be optionally cannulated, i.e.
- bacterici ⁇ dal means 45 will exude from carrier means 40 through apertures, such as apertures 72 through 77, as well as past first and second ends 69 and 70, respectively of bone stabilizing means 65.
- antibiotic compound 20 be positioned at least even with or below exterior surface 66 of bone stabilizing means 65 so as to avoid direct physical abutment of antibiotic compound 20 with the walls of the medullary canal and preclude any pro- truding antibiotic compound 20 from being sheered off during insertion into the medullary canal as illustrated in apertures 77 and 76, respectively. It is contemplated that antibiotic compound may be prepositioned with bone stabilizing means 65 prior to insertion into medullary canal 50, or alterna ⁇ tively, that antibiotic compound may be injected into internal region 68 after bone stabilizing means 65 is positioned in place.
- antibiotic compound 20d positioned within internal region 68 may be formed as a segmented rod 20d, (Fig. 2) , capable of flexing without unduly discharging fragments of antibiotic compound 20.
- Antibiotic eluding intramedullary nail appa- ratus 85 is shown in Fig. 6 as comprising bone stabilizing means 86 having exterior surface 87 and a plurality of grooves, such as grooves 88 and 88'.
- Bone stabilizing means 86 may optionally be cannu ⁇ lated to permit passage of a guide wire.
- Each of the grooves are concentrically positioned with respect to the longitudinal axis of the bone stabi ⁇ lizing means 86 and depend below exterior surface 87 — so as to enable operable positioning of antibiot ⁇ ic compound 20 therein without the antibiotic carri- er compound inadvertently extending above exterior surface 87.
- a plurality of grooves may be concentrically positioned along the entire length of bone stabilizing means 86. Alter ⁇ natively, variances in the number of grooves, as well as the width, depth, and positioning along the surface of bone stabilizing means 86 are also con ⁇ templated.
- Bone stabilizing means 91 includes first end 93, exterior surface 92 and a plurality of substantially U-shaped grooves, such as grooves 94 through 96. Bone stabilizing means 91 may optionally be cannu- lated to permit passage of a guide wire. While each of these grooves may extend the entire length of the bone stabilizing means, grooves being shorter in length as well as varying in depth, are also contem ⁇ plated.
- antibiotic compound 20 is formed into beads 20e and strung on surgical grade wire or suture 97 wherein the strand of beads may be positioned within one or more grooves as illustrated by groove 96.
- Bone stabilizing means 101 includes first end 102, exterior surface 103 and a plurality of substantial ⁇ ly C-shaped retaining grooves, such as grooves 104 through 107. Bone stabilizing means 101 may option ⁇ ally be cannulated to permit passage of a guide wire. Such grooves may extend the entire length of bone stabilizing means 101, or alternatively, they may be shorter or vary in length provided they are open to at least one end of bone stabilizing means 101.
- antibiotic compound 20 be fabricated having a rod-shaped construction and having a cross-section corresponding to the shape of grooves 104 to thereby facilitate their insertion into the C-shaped grooves 104 - 107.
- C-shaped grooves 104 through 107 will restrict the rod-shaped antibiotic carrier compound from inadvertent release unless they are pushed through the ends, such as first end 102, of bone stabilizing means 101.
- antibiotic compound 20 is formed into beads 20e and strung on surgical grade wire or suture 108 wherein the strand of beads may be positioned within one or more C- shaped grooves as illustrated and wherein the diame- ter of the beads is preferably larger than the longitudinal opening of the groove thereby serving to preclude the beads from being dislodged.
- apertures 109 may be formed into the external surface of the bone stabilizing means 101 into which antibiotic compound 20 may be disposed toward administering further quantities and/or types of bactericidal or other agents such as chemotherapeutic compounds.
- antibiotic eluding intra edul- lary nail apparatus 10 and particularly antibiotic compound 20 may be performed in a commercial setting and stored and transported to surgical units in a "ready-to-use" package.
- antibiotic compound 20 may be prepared by appropriate surgical or pharmaceutical staff to suit the needs of a particular patient.
- Antibiotics and bone cement are typically mixed in powered form before the liquid component of the bone cement is added to thus insure an even mixture of antibiotic within the cement. Studies have revealed that excessive amounts of powdered antibiotic in proportion to the bone cement may reduce the strength of the bone cement or other ⁇ wise effect its handling characteristics.
- antibiotic compound 20 examples include, but are not limited to, gentamicin, tobramycin, erythromycin, vancomi ⁇ cyn, oxacillin, cloxacillin, methicillin, lincomy ⁇ cin, ampicillin, and colistin.
- chemotherapeutic agents other than antibiotics which may be desirable for release from the bone cement, or other type of carrier means, are also contemplated for use.
- antibiotic compound 20 After antibiotic compound 20 is formed, it is applied to at least a portion of the region below the exterior surface of the bone stabilizing means 15, such as the: "v-shaped" depressions 31 through 35 of bone stabilizing means 15 (Fig. 1) ; internal region 68 of bone stabilizing means 65 (Fig. 5) ; and/or the grooves, such as grooves 88, 94 and 104 of bone stabilizing means 86, 91 and 101, respec- tively, of Figs. 6 through 8, respectively.
- the bone stabilizing means Once antibiotic compound 20 is positioned with the bone stabilizing means, it is then allowed to substan ⁇ tially cure (although, it is also contemplated that such curing occur prior to such positioning) .
- the antibiotic eluding intramedullary nail apparatus can then be inserted within the medullary canal of the fractured bone where the antibiotics will exude from the bone cement for a continuous, predetermined period of time, to, in turn, inhibit the growth of and/or destroy bacteria within the medullary canal as well as around the wound.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP94908076A EP0655895A4 (en) | 1992-08-20 | 1993-08-20 | Antibiotic eluding intramedulary nail apparatus. |
AU50850/93A AU5085093A (en) | 1992-08-20 | 1993-08-20 | Antibiotic eluding intramedulary nail apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US934,114 | 1992-08-20 | ||
US07/934,114 US5433718A (en) | 1992-08-20 | 1992-08-20 | Antibiotic eluding intramedullary nail apparatus |
Publications (2)
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WO1994004085A2 true WO1994004085A2 (en) | 1994-03-03 |
WO1994004085A3 WO1994004085A3 (en) | 1994-04-28 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/US1993/007869 WO1994004085A2 (en) | 1992-08-20 | 1993-08-20 | Antibiotic eluding intramedulary nail apparatus |
Country Status (4)
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US (2) | US5433718A (en) |
EP (1) | EP0655895A4 (en) |
AU (1) | AU5085093A (en) |
WO (1) | WO1994004085A2 (en) |
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Also Published As
Publication number | Publication date |
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US5433718A (en) | 1995-07-18 |
AU5085093A (en) | 1994-03-15 |
WO1994004085A3 (en) | 1994-04-28 |
EP0655895A4 (en) | 1996-04-17 |
EP0655895A1 (en) | 1995-06-07 |
US5618286A (en) | 1997-04-08 |
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