57 results about "Screw retained" patented technology

A method for treating a screw-cement retained prosthesis, an abutment and an implant are disclosed. The method for treating the screw-cement retained prosthesis, which relates to an internal implant, comprises the steps of providing an abutment comprising a joining projection, repositioning the joining projection to a joining groove formed in the upper portion of a fixture, engaging the abutment to the fixture by using a screw, providing a prosthetic appliance including a screw hole, and bonding the prosthetic appliance and the abutment by interposing dental cement between the abutment and the prosthetic appliance. The present invention includes all of the advantages of screw retained prostheses and cement retained prostheses and at the same time can solve the disadvantages thereof. Using a leading inclined surface formed in the joining projection, the abutment and prosthetic appliance are easily separated from and remounted to the fixture.

A bone plate assembly utilizing at least one bone screw for fixation of adjacent bones of a spine including a base plate having at least one aperture extending therethrough and screw retaining mechanism mounted and movable on the plate between locked and unlocked positions relative to the aperture for preventing the bone screw from backing out from the base plate. Furthermore, a device for placement into an aperture of a base plate including a screw retaining mechanism mountable and movable on a plate between locked and unlocked positions relative to an aperture for preventing a bone screw from backing out from the base plate.

A unitary acetabular cup prosthesis for a deficient acetabulum of a hip bone having a cup portion and a pair of adjacent screw retaining members extending from the cup and oriented in a cooperative with one another. A second pair of screw retaining members are preferably provided, with the first and second pair of screw retaining members oriented such that the prosthesis can be used in either a left or a right acetabulum of the patient. The screw retaining members may be formed on a single flange. The screw retaining members are fixedly inclined and offset relative to the rim of the cup. Each screw retaining member has a threaded hole inclined relative to the rim such that an axis of the threaded hole converges toward the axis of the cup portion in one dimension and is oblique to the axis of the cup portion in a second dimension.

A screwdriver having a retention mechanism for temporarily holding a screw in place on it tip while the screw is being positioned, rotated or removed. More particularly, a screwdriver with a cruciform head used in the installation and removal of bone screws during maxillofacial surgery.

A dental implant adaptor which is particularly suitable for dental crown implantation using a screw-retained protocol has a hollow body that can be mounted on a dental implant. The body includes a crown-receiving portion on which a dental crown can be mounted. The portion has a distal end and a proximal end and includes a first anti-rotation formation to prevent rotation between the adaptor and the crown. The body also has a laterally projecting collar at the proximal end of the crown-receiving portion which, in use, locates on the implant. There is also a second anti-rotation formation shaped for non-rotational engagement with the implant. The crown-receiving portion and collar together have an overall axial length in the range 3.5 mm to 7 mm and the collar has an axial thickness of 1.5 mm or less. Another described is an implant assembly incorporating the adaptor.

A unitary acetabular cup prosthesis (1) for a deficient acetabulum of a hip bone having a cup portion (10) and a pair of adjacent screw retaining members (51, 52) extending from the cup. A second pair of screw retaining members are preferably provided, with the first and second pair of screw retaining members oriented such that the prosthesis can be used in either a left or a right acetabulum of the patient. The screw retaining members may be formed on a single flange. The screw retaining members are fixedly inclined and offset relative to the rim (18) of the cup. Each screw retaining member has a threaded hole (55, 56) inclined relative to the rim such that an axis of the threaded hole converges toward the axis of the cup portion in one dimension and is oblique to the axis of the cup potion in a second dimension.A prosthesis for a deficient acetabulum of a patient having a cup portion and a flange member. The flange member has a base portion that extends upward along a portion of the upper rim. A generally planar screw retaining portion extends from the base portion, and is inclined from the base portion such that at least a lateral portion of a lower surface of the screw retaining portion is positioned below the upper rim while an upper surface of the screw retaining portion is positioned above the upper rim. The screw retaining portion has a first threaded hole, a second threaded hole and a neutral threaded hole, with the neutral hole positioned between the first and the second holes. The holes are inclined at certain orientations to allow for fixation with screws in a deficient acetabulum, and for use in a left or right hip.

A screw-belt advancing mechanism of a screw driving gun includes a barrel unit, a sliding unit connected telescopically to the barrel unit and movable relative thereto between extended and retracted positions, a pivot pin mounted on the sliding unit, and a spring-biased lifting member to engage releasably a screw-retaining belt fed into the sliding unit. The lifting member is pivoted to the pivot pin, and is associated with the sliding unit in such a manner that the lifting member is moved toward the barrel unit and pivots about the pivot pin in a first direction so as to push the screw-retaining belt to a desired position, in which, a selected screw on the screw-retaining belt is aligned with a driving shaft in the barrel unit when the sliding unit slides from the extended position to the retracted position.

A screw-belt advancing mechanism of a screw driving gun includes a barrel unit, a sliding unit connected telescopically to the barrel unit and movable relative thereto between extended and retracted positions, a pivot pin mounted on the sliding unit, and a spring-biased lifting member to engage releasably a screw-retaining belt fed into the sliding unit. The lifting member is pivoted to the pivot pin, and is associated with the sliding unit in such a manner that the lifting member is moved toward the barrel unit and pivots about the pivot pin in a first direction so as to push the screw-retaining belt to a desired position, in which, a selected screw on the screw-retaining belt is aligned with a driving shaft in the barrel unit when the sliding unit slides from the extended position to the retracted position.

A dental implant adaptor which is particularly suitable for dental crown implantation using a screw-retained protocol has a hollow body that can be mounted on a dental implant. The body includes a crown-receiving portion on which a dental crown can be mounted. The portion has a distal end and a proximal end and includes a first anti-rotation formation to prevent rotation between the adaptor and the crown. The body also has a laterally projecting collar at the proximal end of the crown-receiving portion which, in use, locates on the implant. There is also a second anti-rotation formation shaped for non-rotational engagement with the implant. The crown-receiving portion and collar together have an overall axial length in the range 3.5 mm to 7 mm and the collar has an axial thickness of 1.5 mm or less. Another described is an implant assembly incorporating the adaptor.

This invention comprises an orthodontic dental distractor for rapid orthodontic tooth movement, particularly into a fresh extraction socket. The rapid movement can occur from the effect of distraction osteogenesis.The device can include four components: a molar tooth band with buccal tube, a canine tooth band with buccal tube, a threaded screw, and a screw retaining clip. The threaded screw is engaged internally to the molar band tube which is threaded internally. The screw head bears externally on the anterior (mesial) end of the clip, and the clip bears externally on the canine band tube so that when the screw is turned the canine tooth moves distally toward the molar tooth. Thus the movement of a tooth can be controlled to proceed at a rapid and prescribed rate.

A conversion abutment that cements onto one-piece dental implants that convert the one-piece implant use to a retrievable screw retained implant use in retaining complete dentures, hybrids, partial dentures, or fixed screw retained crowns or bridges, allowing the flexibility to retain and remove these restorative prostheses. These conversion abutments can be fabricated as angled conversion abutments to be used with single or multiple implants placed at various angulations. The conversion abutment system consists of three parts: a cementable conversion abutment (straight or angled), a coping (short or extended), and an occlusal screw. The bottom part (or apical portion) of the implant conversion abutment will cement over the one-piece implant in use, while the top (or coronal portion) will allow a screw to fit through a coping into the implant conversion abutment, screwing the prostheses into place.

An abutment is provided with a screw access hole and a slot in its sidewall adapted to allow a driver to access a screw in the screw access hole at an angle relative to a longitudinal axis of the screw. The abutment may include a screw seat and may be connected to an implant via a screw in the screw seat. A prosthesis, which may include a driver access channel that has a diameter less than the outer diameter of the drive portion of the screw, may be placed over the abutment. Methods of making a dental prosthesis and methods of attaching and removing the dental prosthesis from the implant are also disclosed.

A screwdriver having a retention mechanism for temporarily holding a screw in place on its tip while the screw is being positioned, rotated or removed. More particularly, a screwdriver with a cruciform head used in the installation and removal of bone screws during maxillofacial surgery.

A tool capable of selectively coupling to a fastener.

A surgical screw driving device for driving a screw into a surgical fixture. The device has a screwdriver having a proximal end, a distal end having a driver for engaging the screw, and an elongated shaft extending therebetween. The device has a screw retainer surrounding and extending along the elongated shaft. The screw retainer is configured to engage and hold a periphery of a screw head prior to the screw being driven into the surgical fixture. The screw retainer is configured to disengage from the periphery of the screw head as an axial end of the screw retainer contacts the surgical fixture and is further configured, upon disengagement and without necessity of outside assistance, to translate along the elongated shaft of the screwdriver away from the distal end and toward the proximal end.

A screw holding device configured to assist a screwdriver in holding a screw, the screwdriver providing rotary power output to the screw, the screw holding device comprising: a body capable of being connected with the screwdriver; a holder connected with the body and comprising at least two clamping arms configured to move between a clamp position wherein the screw is clamped and a release position wherein the screw is released; and a driving mechanism configured to drive the clamping arms and comprising a guide unit and a connection unit. The connection unit is in correspondence to the clamping arms and comprises first and second connectors respectively connected with the clamping arms. The guide unit drives the first connector to move longitudinally and laterally, and drives the second connector to move at least longitudinally, so as to drive the clamping arms to produce pivotal motion and longitudinal linear motion.

A substantially tubular intermediate attachment part with a first through-hole for attaching a screw-retained dental prosthetic component or a dental tool to a dental implant or to a dental implant analog, extending along a first longitudinal axis between a first end and a second end. Each end is provided with a set of longitudinal fins intended for snap-fitting into the dental prosthetic component or into the dental tool on the one hand and into the dental implant on the other hand.

A storage system allows secured attachment in a device, such as a refrigerator, a freezer, a medical cart or the like, having a shelf comprising spaced-apart wire rack ribs. The storage system has a body with top and bottom walls, side walls, a rear wall, and an open front face opposite the rear wall, the top wall having a pair of spaced-apart apertures. A front door, hingedly attached to the body, is sized to fully close the front face when attached thereto. The body is attached to the shelf using a screw and a screw-retaining member, with the screw-retaining member operating to secure the ribs of the shelf between itself and the body. A screw, with its head located inside the body, passes through one of the apertures and is threadingly secured to the screw-retaining member.

The invention discloses a lead screw mounting structure and a mounting method thereof. The lead screw mounting structure comprises a lead screw and a bearing. The upper portion of the lead screw is inserted into and fixed to the center of the bearing, a load is arranged on the lower portion of the lead screw, the external diameter of the part, inserted into the center of the bearing, of the upper portion of the lead screw is smaller than the external diameter of the lower portion of the lead screw, and one or more stepped grooves are formed in the part, inserted into the center of the bearing, of the upper portion of the lead screw. The lead screw mounting structure further comprises a split type lead screw shoulder ring and a bearing fixing part, the split type lead screw shoulder ring is arranged on the upper portion, inserted into the center of the bearing, of the lead screw in a sleeving mode, and the bearing fixing part is mounted outside the split type lead screw shoulder ring. According to the lead screw mounting structure and the mounting method thereof, a lead screw retaining ring is divided into two half symmetrical parts, a plurality of stepped grooves can be selected according to the size of the load, the reliability is greatly improved compared with the mode that the lead screw is fixed through a nut, the lead screw shoulder ring is in a split type design, the external diameters of materials needed by lead screws of the same specification are small, the lead screw can be machined conveniently, materials are saved, and using is more flexible.

A hybrid temporary anchorage device implant system and method of use is disclosed. A temporary anchorage device (TAD) implant includes an external hex head, a cupped inner portion, a threaded core, a platform, and an implant portion. A first abutment is installed on the implant portion. The first abutment may include a graduated portion, a screw-retained healing collar, and a threaded portion. A second abutment may be installed over the first abutment. The second abutment may include a graduated head, a bulbous base, and an inner canal.

The invention discloses a manufacturing method of an upper structure of a screw-retained implant. The manufacturing method comprises the following steps of: filling a working model for implant restoration of missing teeth; fixing an abutment on an implant analog of the working model; manufacturing a wax pattern of an inner crown of a prosthesis and reserving a screw hole on a porcelain bridge surface at a butment part of the wax pattern; removing the wax pattern, embedding and casting to manufacture the inner crown of the prosthesis, and reserving the screw hole on a casting surface; performing porcelain piling on the inner crown of the prosthesis to manufacture an outer crown of the prosthesis and complete a metal porcelain bridge; and closing a screw channel on the abutment, which is communicated with the screw channel of the implant and bonding the metal porcelain bridge on the abutment for forming the upper structure of the implant. According to the manufacturing method disclosed by the invention, the manufacturing difficulty in a technician office of the upper structure of the screw-retained implant can be reduced on the basis of retaining the repeatable usability of the prosthesis, and the dovetailing precision between the upper structure and the implant can be simultaneously effectively improved.

The invention provides a screw retaining ring. Via use of a metal plate, axial force can be set to a higher value, and reduction of the axial force caused by creep deformation and change of the axial force caused by plate thickness non-uniformity of a to-be-installed part such as a panel, etc. The screw retaining ring (10) comprises: a gasket (30) provided with a flange part (60) and a shaft part (70); and a metal plate (40) freely rotatably installed on the gasket (30), and provided with a base part with a screw thread hole (43) formed coaxial with an insertion hole (80) and a supporting foot (42) extending toward the flange part (60) and opposite to the back surface of the flange part (60). Via the shaft part (70) being inserted into an installing hole (21) of the to-be-installed part (20) such as the panel, a self-tapping screw (50) is screwed into the screw thread hole (43), the metal plate (40) is made to rotate and move axially, and therefore, the to-be-installed part (20) is clamped by the back surface of the flange part (60) and the supporting foot (42).

Described is a two-part, screw retained dental implant prosthesis. The dental implant prosthesis includes both a primary substructure (made of for example, titanium) and a secondary superstructure (made of for example, zirconia). The primary substructure includes a top side and a bottom side, with substructure holes passing through the primary substructure from the top side to the bottom side. The primary substructure is formed to align with and secure against a dental implant as affixed in a patient's jaw. Alternatively, the secondary superstructure is formed to be affixed with the primary substructure. Thus, the primary substructure can be affixed with the dental implant, with the secondary superstructure thereafter being affixed with the primary substructure.

The invention is a hexagonal bolt holding paw, which comprises a V-shaped block, a V-shaped block support, an electromagnet shell, an electromagnet iron axle, a bent axle and a fixing axle. The electromagnet axle is arranged in the electromagnet shell, a round electromagnet is fixed in the electromagnet shell, two movable V-shaped blocks are provided on the V-shaped block support, the two ends of the bent axle are connected with the V-shaped block and the electromagnet iron axle by a pin, the middle part of the bent axle is positioned at the bottom board of the electromagnet shell by a fixing axle. The paw structure can be fixed on other structures conveniently. The invention can be used in the automatic clamping of hexagonal bolt, which has advantages of quick and accurate clamping bolt, and is suitable for the bolt of different size and improving working environment and efficiency.

A temporary alignment system and method for holding a dental coping to an implant abutment using the same threads in the abutment that are used for definitive attachment are disclosed. The disclosed temporary fasteners initially orient and hold a coping against an abutment with a force along the same axis as the semi-definitive screw. The aligned coping can be picked-up in a closed-tray impression process without unscrewing the temporary fastener. Embodiments include threaded posts that release copings from the abutment through axial forces. Some embodiments include a threaded post with separable cap that is picked-up with the coping. Methods for converting an existing prosthesis for screw attachment to implants in a single visit and digital capture of the converted prosthesis are described.

A conversion abutment that cements onto one-piece dental implants that convert the one-piece implant use to a retrievable screw retained implant use in retaining complete dentures, hybrids, partial dentures, or fixed screw retained crowns or bridges, allowing the flexibility to retain and remove these restorative prostheses. These conversion abutments can be fabricated as angled conversion abutments to be used with single or multiple implants placed at various angulations. The conversion abutment system consists of three parts: a cementable conversion abutment (straight or angled), a coping (short or extended), and an occlusal screw. The bottom part (or apical portion) of the implant conversion abutment will cement over the one-piece implant in use, while the top (or coronal portion) will allow a screw to fit through a coping into the implant conversion abutment, screwing the prostheses into place.

The invention discloses a screw holding device with a clamping part and a hook part. The clamping portion engages the screw head to hold the screw securely. The hook interacts with the surface of the element to which the screw is fastened to limit the rotation of the screw. The screw retaining device is configured for use with any known screw having a protruding head. In a preferred embodiment of the invention, the screw retaining device is used with a serrated screw, wherein the clamping portion of the screw retaining device includes a serrated portion which corresponds to and engages the serrations on the serrated screw to securely clamp Hold the screw.

The mounting structure of the circuit board connector 1 which is conductively connected with a circuit board 3 installed in a case 2 and fixedly mounted to the case 2 comprises a connector housing 4 for joining the circuit board connector 1 with a mating connector, and a terminal 7 including first contactors 5 to be coupled with corresponding terminals of the mating connector and second contractors 6 to be conductively connected to the circuit board 3, wherein the connector housing 4 is located closer the case 2 than the circuit board between the circuit board 3 and the case 2 and fixedly tightened to screw retaining portions 8 of the case.