435 results about "Medullary cavity" patented technology

The present invention provides a two-part telescopic intramedullary orthopedic device comprising a first section inserted into the medullary cavity of one of the fractured or severed bone ends, and secured thereto, and a second section inserted into the medullary cavity of the other fractured or severed bone end and secured thereto, wherein the first section is telescoped within the internal space of the second section, and wherein one of the sections comprises a ferromagnetic material and the other section is either constructed entirely of a non-magnetic material or comprises a ferromagnetic material, wherein the ferromagnetic section(s) are actuable by an external axially directed magnetic field, such that one section may be caused to move axially (either bidirectional or essentially unidirectional) in relation to the other section. In addition, the invention encompasses a method for changing bone length as well as a method for enhancing bone fracture healing.

A distraction device for moving a one-part or two-part or separated bone apart in order to extend or bridge a bone gap. The device is optionally provided in the form of an intramedullary pin, which can be inserted into a medullary space of a bone and which has at least two elements that can be axially moved in relation to one another. The first element is joined to the second element via at least one detent device for securing a distraction movement, and a pushing module for distracting the first element is assigned to the second element and is joined to the second element in a manner that enables it to be locked.

This prosthesis comprises a humeral or femoral component and an intermediate component. The concave surface of articulation of the humeral or femoral component is formed by a plate connected by a neck to a part of this component adapted to be anchored in the humeral or femoral medullary cavity. The intermediate component is provided with a member for retaining the humeral or femoral component in a position where the plate is in abutment against the first convex surface of the intermediate component. The retaining member defines a non-circular passage in which the neck is adapted to be displaced as a function of the movements of the humeral or femoral component with respect to the other components of the prosthesis. The retaining member defines with the first convex surface of articulation of the intermediate component a volume for receiving a part of the plate projecting radially with respect to the neck.

A bone fixing blade (2), which is fixed at a intermedullary nail main body (1) to be inserted into a medullary space of a fractured thighbone and which fixes a big bone piece portion (B1) and a small bone piece portion (B2) composing the thighbone, is provided with a cut-out portion forming unit (231) formed in a stick-like shape along a circumferential direction of the bone fixing blade comprised of three cut-out portions (23a) cut out from the surface toward the inside, wherein the cut-out portion forming unit (231) is pressed into the inside of each of the big bone piece portion and the small bone piece portion to be in a position on a recess side that is deeper than a bone fracture line (L).

This prosthesis comprises a humeral or femoral component and an intermediate component. The concave surface of articulation of the humeral or femoral component is formed by a plate connected by a neck to a part of this component adapted to be anchored in the humeral or femoral medullary cavity. The intermediate component is provided with a member for retaining the humeral or femoral component in a position where the plate is in abutment against the first convex surface of the intermediate component. The retaining member defines a non-circular passage in which the neck is adapted to be displaced as a function of the movements of the humeral or femoral component with respect to the other components of the prosthesis. The retaining member defines with the first convex surface of articulation of the intermediate component a volume for receiving a part of the plate projecting radially with respect to the neck.

The present invention provides a system and a method for reducing pores, or air pockets, that form at the interface between the material used to attach or adhere the surface of a component, such as a prosthesis, to a site.A preferred embodiment of the invention includes an actuator that controls a coupler which transmits energy to a prosthesis being inserted into a material to reduce porosity at an interface between the prosthesis and the material.The system of the present invention can include an oscillating hand-held device that vibrates the stem component of an orthopedic prosthesis at a particular frequency and amplitude. The device is typically held by the hand of the surgeon, who guides the vibrating prosthesis into the cement-filled medullary cavity.

The intramedullary nail has a distal end suitable for insertion in the medullary space, wherein the segment of the intramedullary nail facing the distal end has a diameter D, a proximal end, a central longitudinal axis; and several cross holes with a hole axis, each of which defines a virtual borehole cylinder with a cylinder axis corresponding to the hole axis of the defining cross hole, wherein the borehole cylinders of at least two cross holes penetrate each other. The cylinder axes of the two mutually penetrating borehole cylinders do not have any common intersection point P on the longitudinal axis. This results in improved mechanical strength compared to the state of the art, without any need for the size of the cross section of the intramedullary nail to be increased.

An interlocking bone plate system includes an outer bone plate for being arranged outside a broken bone, an inner bone plate for being installed inside the medullary cavity of the broken bone, and screws for being inserted through and engaged with the outer bone plate and the broken bone and then engaged with the inner bone plate so as to interlock the out and inner bone plates together. The inner bone plate provides an added support in addition to the support provided by the outer bone plate, enhancing the structural strength of the whole bone fixation structure and lowering the risk of failed surgery.

An orthopedic prosthetic implant comprises a metal alloy stem element (13, 63, 113), which has one end portion (19, 69, 119) constructed to reside in the medullary cavity of a bone and an integral connector (23, 73, 123) at the opposite end to which crystalline brittle head (17, 67, 117), preferably made of pyrocarbon-coated graphite, is joined. The head interfaces with human bone, and its effective joinder to the stem element is achieved through a polymeric insert (15, 65, 115) of proportional shape and design which has selected elastic properties. The design and material of the polymeric insert allow it to be securely received within an interior cavity (35, 77, 131) of the pyrocarbon-coated graphite head and mated to the stem connector in an either rigidly or bi-polar arrangement. The method of joinder allows the construction of composite implants that utilize the most desirable properties of metallic and brittle crystalline materials.

A device is provided including a distal nail portion and a proximal nail portion that can be connected to each other to attain a rigid configuration. The device is to be placed internally within the medullary cavities of at least two bones forming a joint to accomplish arthrodesis of the joint. The device is placed intramedullarily in order to minimize incision size, excessive bone resection and post-operative tendon damage and tenderness. Additionally, one particular method for using the device is provided that includes placing and affixing the distal nail in a bone of a joint, placing the proximal nail in another bone of a joint, connecting the distal nail to the proximal nail, doing the desired geometrical adjustments, affixing the proximal nail to the distal nail by tightening the connection and affixing the proximal nail to the other bone of the joint to attain a rigid configuration.

An apparatus has been developed to enable a surgeon to perform multiple orthopedic surgical operations, such as orthopedic surgical resectioning, total joint replacement and fixation of fractures, based on a single reference point. The apparatus is adjustable to conform to the needs and dimensions of individual patients and the surgical procedure(s) to be performed. The apparatus includes a support adapted for insertion into and alignment within the medullary cavity of a patient's bone. The support is capable of expanding into the bone so that the support is fixed within the bone and alignable to the bone. The support may be implanted to align a fractured bone, or extend a distance beyond its fixed position within the medullary cavity to provide a known surgical reference point. The apparatus includes one or more cutting guides mountable on the support and used in performing the desired surgical procedure(s). The cutting guides are positionable with respect to the known surgical reference point created by the support which enables the user to accurately position and secure various instruments at the desired position about the patient's anatomy.

The present application relates to an implant for tubular bones and to a method for treating fractures of tubular bones. The implant is used to connect two parts of a tubular bone that has broken with a substantially smooth break. The implant is formed by a shaped piece that is inserted into the medullary cavity of a broken tubular bone. The shaped piece has at least one through-opening, which has a substantially constant internal diameter and extends substantially through the shaped piece and through which a cord can be pulled in order to stabilize the fracture. The shaped piece is made of resorbable material, and two anchor parts can be secured on the cord. The anchor parts fix the cord to the bone, and the shaped piece exploits the principle of an internally braced stack in order to press the fracture surfaces of the bone against each other.

This method comprises the use of a repair equipment including a humeral rod (2) intended to be placed in the medullary cavity of the humerus, comprising at least one hole (6) for receiving a thread (11) for repositioning the tuberosities (101, 102) and for maintaining the latter with respect to the rest of the bone. Said hole (6) is formed in the metaphyseal portion of the humeral rod (2), in the anteroposterior direction thereof; and the repair equipment further comprises a so-called “guying” subassembly (3), to maintain the tuberosities (101, 102) when they re-installed, two second so-called “traction” subassemblies (4), for pulling of the tuberosities (101, 102) one toward the other, and two so-called third “pressing” subassemblies (5), for tackling the tuberosities (101, 102); each of these sub-assemblies comprises a needle and thread (11) connected to this needle, this thread (11) forming a loop.

A stem of an artificial hip joint is capable of removing a gap that may be formed between a proximal portion of a femur and a backside of the stem. The stem has an upper end portion 11 to face a proximal side and a backside 15 to face a greater trochanter 33 and is adapted for insertion into, and fixation to, a medullary space of a femur, and the stem has a through bore 17 opened both to said upper end portion and the vicinity of proximal end of said backside.

A modular assembly for a femoral prosthesis comprises a femoral prosthetic implant forming a spindle of elongate and tapered shape and a one-piece neck. The implant consists of a diaphyseal lower part and a metaphyseal upper part having a flat face delimited by an outer edge and in which a cavity is formed. The neck is formed of a tenon having a shape corresponding to the cavity, said tenon being fitted into the cavity along an insertion axis YY perpendicular to the flat face and a rod provided with an interface for fixing a cup that is to be inserted into the acetabulum of the hip bone. The rod is provided with a tongue which protrudes parallel to the flat face in a radial direction with respect to the insertion axis and directed towards the interior of the obtuse salient angle, at a distance from the flat face of between 0.3 mm and 1.5 mm measured along the insertion axis, the tongue having a free end located at a greater distance from the insertion axis than the part of the edge located opposite the tongue. The free end of the tongue overhangs somewhat with respect to the outer edge of the flat face of the femoral prosthetic implant, in such a way as to ensure that, in the event of sinking of the implant into the medullar cavity, the tongue will come into abutment against the femoral calcar.

An apparatus for intrasosseous injection of medication to the medullary cavity of a jawbone and for the extraction of medullary bone contents is disclosed. It comprises an implant housing component, a drill bit component and a seal plug component. The implant housing component is implanted into the cortical bone of the mandible. The drill bit component produces a hole within the mandible that initiates the implanting of the implant housing component. The seal plug component that is removably attached to the distal end of the implant housing component allows for repeated access of a hypodermic needle into the mandible.

An intramedullary nail, particular for use with a tibia, may have a proximal end part, a distal end part adapted to be introduced into a medullary space, and a central section. The central section includes a first curved section having a first length with a first radius of curvature, and a second curved section having a second length shorter than the first length and a second radius of curvature smaller than the first radius of curvature. The second radius of curvature may be less than the first radius of curvature. The intramedullary nail also includes a central axis. Tangents at two end points of the central section, including the first and second curved sections, enclose an angle gamma between about 9° and about 12°. The intramedullary nail may have a total length ranging from 200 to 500 mm.

The present invention discloses an acquisition method for anatomical parameters of femur and acetabulum based on CT three-dimensional sequence image. The method comprises the steps of: acquiring a CT three-dimensional sequence image with femur and acetabulum; segmentation of the femur and the acetabulum: performing coarse segmentation, separation and precise segmentation on the CT three-dimensional sequence image sequentially, to obtain a femoral precise segmentation image and an acetabular precise segmentation image; calculation of anatomical parameter of femur: according to the femoral precise segmentation image, constructing a triangular mesh surface model of a femoral surface, calculating a femoral diameter parameter, a medullary cavity inner diameter parameter and a spherical fitting parameter of a femoral head; and calculation of anatomical parameter of acatabulum: selecting the acetabular precise segmentation image to construct multiple surface points of a triangular mesh surface model of an acetabular surface, and calculating anteroposterior diameter of the acetabulum. According to the method, the CT three-dimensional sequence image is directly processed, and precise segmentation of femur and acetabulum and acquisition of anatomical parameters are rapidly and automatically realized, so as to assist in individualized design and modeling of artificial bone prosthesis.

A femoral stem 2 for artificial hip joint is provided that is capable of tightly fixing a greater trochanter and is suitable for treatment of transcervical fracture where it is necessary to fix the greater trochanter. The femoral stem 2 comprising: a stem member 20 including a distal part 21 of the stem member which is inserted in a medullary cavity of a femur and fixed therein and a proximal part 22 of the stem member which has a neck 26 for fixing an artificial head and is positioned at a proximal end of the distal part, the distal part and the proximal part being integrated or separable; a plate fixing portion 36 which is detachably attached at a top of the proximal part; and a greater trochanter plate 3 for depressing the greater trochanter 71, the greater trochanter being fixed to the plate fixing portion 36 at a certain angle or fixed to the plate fixing portion so as to adjust an angle. Since the greater trochanter plate 3 is fixed onto the femoral stem 2 of the present invention, the greater trochanter is tightly fixing and thus the fixation can be stabilized. Furthermore, since the greater trochanter plate 3 is fixed at the top of the proximal part 22, the greater trochanter plate 3 covers the top of the greater trochanter 71 when the greater trochanter 71 is fixed. Therefore upward displacement of the greater trochanter by a gluteus medius musculus can be effectively suppressed.

The invention discloses an articular surface retaining type extendable tibial neoplasm knee joint prosthesis. The prosthesis comprises a steel plate type tibia proximal prosthesis, a patellar ligament fixing plate, an adjustable backbone extending joint, an adjusting nut, an adjustable medullary cavity extending handle and a fixing assembly; the steel plate type tibia proximal prosthesis is provided with a groove with a bone trabecula porous structure, the patellar ligament fixing plate is arranged in the groove with the bone trabecula porous structure, the adjustable backbone extending joint is arranged on the lower portion of the steel plate type tibia proximal prosthesis, the lower portion of the adjustable backbone extending joint is provided with a lower tibia segment, the adjustable medullary cavity extending handle is arranged on the lower tibia segment, and the lower tibia segment is fixed to the adjustable backbone extending joint in a matched mode through the adjustable medullary cavity extending handle. According to the articular surface retaining type extendable tibial neoplasm knee joint prosthesis, a bone growth function of a child patient can be guaranteed while a knee joint movement function is retained; in addition, the end face, closely attached to the osteoepiphysis, of the steel plate type tibia proximal prosthesis is provided with the bone trabecula porous structure, therefore, bone growth is promoted, a long-term biological fixation effect is formed, and the service life of the prosthesis is prolonged.

The purpose of the invention is to eliminate not only the shearing stress concentration occurring at a distal end of a stem but also that at a proximal end thereof so that a load acted on a hip joint can be distributed collectively on the proximal portion of the stem corresponding to transmission route in a normal state and the range of variation of the stress distribution on the proximal portion comes to be as narrow as possible on the whole. An artificial cement-less hip prosthesis stem which comprises an inner construct 7 reacted with the load acted on the hip joint and an outer construct 8 transmitting the load acted on the inner construct to a femur 1. The former construct has an inner body 7B reacted with the load transmitted from a neck 7A. The latter construct has both an outer body 8A which is bell mouth-shaped toward epiphysis so as to surround the inner body 7B and a leg 8B extending toward medullary cavity. The torsional rigidity given to the proximal end and the distal end of the outer body 8A and the leg 8B is regulated lower than the torsional rigidity given to the intermediate portion 18 of the outer body 8A,

A method for treating a fracture of a bone with a medullary canal. A first and a second group of three elongated monocortical pins are provided. Each pin has a stem with a first end portion having a conical shape with an external thread for insertion into a cortical portion of a bone. Each pin of the first and second group of three monocortical pins is inserted a predetermined distance from the bone fracture, and penetrates only into the cortical portion of the bone without reaching the medullary cavity, the pins of the first and second group being inserted such that they are not coplanar to each other. The stems of the pins of the first and groups are blocked to a first and a second common clamp element respectively. The first and second clamp elements are joined to a common rod to form a rigid external fixation system.

The invention discloses a method for determining a distal femur cuneiform plane in a digital auxiliary mode. The method mainly comprises the following steps that 1, continuous sectional CT scanning is performed on a patient, and image data is obtained; 2, three-dimensional data of a knee joint prosthesis is obtained through reverse engineering means; 3, polygonal processing and precise curved surface processing are performed on the three-dimensional data of the thighbone and the knee joint prosthesis; 4, marking and checking of synostosis mark points are performed in computer aided design software; 5, the cuneiform plane is determined for performing cuneiform rehearsal. The method has the advantages that digital means is adopted before operation, synostosis mark points, axes, prosthesis models, cuneiform planes and the like are determined, and an operation path can be better planned, and an operation plan can be designed; the cuneiform plane does not need to be determined by opening a medullary space, wounds are reduced, and the bleeding volume and fat embolism occurrence probability are lowered; computer assistant positioning is performed, the positioning accuracy is improved, the operation effect is better, and the patient recovery time is shortened.

A femoral prosthetic component of a replacement hip joint comprises a stem for fixing in a medullary cavity. A separate proximal element is provided with a neck for receiving a modular ball head or having an integral ball head. A dove tail-shaped system is provided for securing the proximal component to the stem which includes a sliding tongue and groove joint. The tongue being provided on the stem by an undercut rail which extends in a medial-lateral direction and the groove being provided in the separate proximal element. The tongue and groove being tapered along their lengths.

The invention provides an implantable medical device for treatment of a proximal humerus fracture, comprising a base element to be anchored in the medullar cavity of the humeral shaft, a support element to be fixed with respect to the base element, wherein the support element is configured to support one or more bone fragments, wherein the medical device comprises positioning members configured to position the support element with respect to the base element in a range of rotational positions and axial positions, and wherein the medical device comprises a fixation device to fixate the support element, within the range of rotational positions and axial positions, in a desired rotational and axial position with respect to the base element. In an embodiment, the medical device is a non-occluding medical device, wherein after implantation the medullar cavity is not occluded by the medical device due to the open and non canal filling structure of the device preserving blood flow to the reattached bone fragments.

The invention discloses a bone defect filling scaffold structure, which comprises a plurality of cylindrical base layers; meshed structures are arranged on the cylindrical base layers, and the plurality of cylindrical base layers are arranged in a mode of being nested layer by layer, wherein the axial length of the plurality of cylindrical base layers on the inner layer is greater than the axial length of the plurality of cylindrical base layers on the outer layer, so that two ends of the plurality of cylindrical base layers on the inner layer are protruded outwards along an axial direction ofthe cylindrical base layers to form two fixing parts; and the two fixing parts are inserted into medullary spaces of two fracture ends of a bone defect position when the bone defect filling scaffoldstructure is implanted into the bone defect position, so that the bone defect filling scaffold structure is fixed. Therefore, the bone defect filling scaffold structure of the embodiment, after beingimplanted into the defect position in a bone defect repair operation, can be effectively prevented from sliding; and a problem of the prior art that a bone defect repair scaffold, after being implanted onto the surface of a bone defect fracture end, slides is solved.

A method enabling a destroyed part of a joint or joint cartilage to be extracted accurately and at a high speed with a good repeatability and enabling quantitative and simple 3D analysis of the joint and the destroyed part, that is, a method of 3D image processing comprising filling in a medullary cavity region, comprised of a hollow region inside a joint, of a digitalized image of a cross-section of the examined joint using the Expansion and Shrinkage method, performing 3D labeling by a 3D image obtained by stacking digitalized images of cross-sections of the examined joint generated at a step of extracting a contour of the cross-sectional image of the joint or digitalized images of cross-sections of the examined joint not pre-processed, and defining the joint image to be evaluated.

An orthopedic prosthetic implant comprises a metal alloy stem element (13, 63, 113), which has one end portion (19, 69, 119) constructed to reside in the medullary cavity of a bone and an integral connector (23, 73, 123) at the opposite end to which crystalline brittle head (17, 67, 117), preferably made of pyrocarbon-coated graphite, is joined. The head interfaces with human bone, and its effective joinder to the stem element is achieved through a polymeric insert (15, 65, 115) of proportional shape and design which has selected elastic properties. The design and material of the polymeric insert allow it to be securely received within an interior cavity (35, 77, 131) of the pyrocarbon-coated graphite head and mated to the stem connector in an either rigidly or bi-polar arrangement. The method of joinder allows the construction of composite implants that utilize the most desirable properties of metallic and brittle crystalline materials.