105 results about "Initial stability" patented technology

A vertebral implant for fusing adjacent vertebrae or for replacing vertebral bodies is disclosed. The implant is a biocompatible metal, resorbable, or radiolucent implant conforming substantially in size and shape with an end plate of a vertebra. The implant preferably has a wedge-shaped profile to restore disc height and the natural curvature of the spine. The top and bottom surfaces of the implant have areas with a plurality of teeth to resist expulsion and provide initial stability and areas devoid of any protrusions to receive implantation instrumentation. The implant also has a stackability feature. The implant provides initial stability needed for fusion without stress shielding.

The present invention relates to an intervertebral implant for fusion of vertebrae. The implant has top and bottom surfaces configured and dimensioned to contact end plates of the vertebrae and a jacket forming a side surface of the implant and having a three-dimensional texture for promoting initial stability. The implant is made of a porous ceramic material. The implant according to this invention is characterized in that upon primary fusion during the resorption process, it equalizes the distance (corresponding to intervertebral disk height) between two vertebrae while providing adequate fusion and is resorbed by the body after a certain amount of time.

A device has been developed to augment the rotator cuff tendon tissue as it proceeds in healing. The device has two purposes: to provide initial stability to the rotator cuff repair site to allow early mobilization of the upper extremity of the patient, and to allow for reinforcement of rotator cuff tendon repairs to increase the likelihood of successful rotator cuff tendon repairs. The device consists of an inter-connected, open pore structure that enables even and random distribution and in-growth of tendon cells. The braided structure allows for distribution of mechanical forces over a larger area of tissue at the fixation point(s).

An allogenic intervertebral implant for fusing vertebrae is disclosed. The implant is a piece of allogenic bone conforming in size and shape with a portion of an end plate of a vertebra. The implant has a wedge-shaped profile to restore disc height and the natural curvature of the spine. The top and bottom surfaces of the implant have a plurality of teeth to resist expulsion and provide initial stability. The implant according to the present invention provides initial stability need for fusion without stress shielding.

A plurality of canine acetabular cups designed to fit within different sized spherical reamed bone cavities to produce controlled interference without use of cements, screws or nails. Each of the canine acetabular cups, regardless of size, mates with a common femoral head, providing interchangeability. The controlled interference is obtained through use of a multiple curvature Ti—Al—V shell having a porous coating. The interference starts from zero at 50 degrees from the apex of the shell and extends to full interference value at 90 degrees from the apex. The Ti—Al—V shell carries a UHMW polyethylene insert, which is locked by interference, a non-circular post mated with an elongated opening and a circumferential locking groove mated with an interior projection. Initial stability is provided immediately after surgery due to the interference arrangement; long term stability is afforded by bone ingrowth.

Disclosed therein is a big femoral head and femoral head surface replacement, which are used for hip osteoarthritis and vascular necrosis of femoral head. As a person get older and aged, the weight bearing hip joint is indispensably changed to osteoarthritis and sometimes showed avascular necrosis of the femoral head with unknown etiology. The deformed femoral head and hip joint should be replaced with the THA. Till now, the total hip replacement is performed in such a way that the necrosed femoral head and a healthy femoral neck are all removed and a femoral stem is inserted into the marrow cavity, and in this case, a small femoral head causes a reduction of a range of motion and dislocation of the hip joint occasionally, and osteolysis due to abrasion of plastic acetabular liner. In case of a conventional femoral head surface replacement (hereinafter, called “conventional FHSR”), a complication of femoral neck fracture and could not combined use with conventional THA. Recently, hard bearing system such as metal on metal THA or ceramic on ceramic THA without using plastic has been introduced to solve the problem of osteolysis due to abraded plastic particles generated when the THA is worn out as time goes. But there also have many problems as a limited range of motion, resected normal femoral neck and difficulties of rereplacement of the femoral stem. Because of the big femoral head or the FHSR can increase the range of motion and lower dislocation rate these devices are gradually widespread in young active person and Asian peoples. This invented design of the modularity gives the convenience to the surgeon and economically lower burden to patients to use of the FHSR and big femoral head system. The related accessory showed initial stability of the FHSR during operation and prevent from femoral neck fracture in follow-up periods.

The invention belongs to a medical apparatus, and in particular relates to an expanded tooth implant, which is characterized by consisting of an implant body (1) and an expanded core (3) and a repair base station (2) matched with the implant body (1), which are mutually embedded by threads. The implant can improve the tightness of the implant in bones, particularly under the condition of loose bones so as to improve the initial stability and reduce the loosening and falling rate, and can also be planted immediately after routine exodontia.

A kit is provided based on two pastes designed to produce bone cement with high initial stability and therefore low post-cure. The kit includes a paste A and a paste B, wherein paste A contains (a1) a polymerizable monomer having a pH in water in the range of 5-9, (a2) a filling agent insoluble in (a1), and (a3) a barbituric acid derivative selected from the group consisting of 1,5-disubstituted barbiturates, 1,3,5-trisubstituted barbiturates, and 1,3,5-tetrasubstituted barbiturates, and paste B contains (b1) a polymerizable monomer having a pH in water in the range of 5-9, (b2) a filling agent insoluble in (b1), (b3) a peroxide soluble in (b1), (b4) a heavy metal compound insoluble in (b1) and selected from the group consisting of heavy metal salts and heavy metal complexes, and wherein at least one of the pastes A and B contains a halide salt.

The invention relates to a quantitative evaluation method for dynamic stability of a creep-type side slope, in particular to a method for determining a dynamic stability coefficient of the creep-type side slope. The method includes the following steps: (1), measuring related parameters of the side slope and determining an initial stability coefficient F0; (2), arranging side slope displacement monitoring points and acquiring displacement monitoring data; (3), determining side slope creep rupture instability time and a stability coefficient Ft in a constant-speed creep stage; (4), determining an initial point tc and a stability coefficient Ftc in a side slope accelerated creep stage; (5), determining the dynamic stability coefficient in an accelerated deformation stage of the creep-type side slope; (6), determining a criterion for early warning of instability of the creep-type side slope. By the method, instability time of the creep-type side slope and landslide safety coefficients of the side slope at any time can be determined clearly, the limitation of incapability of analyzing and evaluating the dynamic stability of the side slop in real time according to conventional balance methods is overcome, and efficiency of dynamic stability evaluation and monitoring and early warning of the complex creep-type side slope can be greatly improved.

The invention discloses a preparation method of a titanium dental implant, which includes the following steps: arranging the dental implant to be in spiral shape, increasing the initial contact area of the implant, improving the initial stability of the implant, increasing the surface area of the implant and improving the stress distribution at the bone interface; obtaining a rough surface through abrasive blasting; designing a porous structure on the surface of the implant through a laser etching method; preparing a porous TiO2 oxide film on the surface of the implant through an anodic oxidation method, wherein the oxide film has a rough surface and has round pits in different sizes at local parts; treating the anodized titanium surface through alkali liquor to form a titanium gel layer rich in Ti-OH groups which induce the production of calcium phosphate crystal nucleus to form an osteoid apatite layer. The invention processes the medical pure titanium to be in spiral shape and modifies the surface of the implant through a series of methods of abrasive blasting, laser etching and anodic oxidation so as to enhance the bonding strength of the implant and the bone and to improve the success rate of the repair of the implant.

The invention discloses a method and a device for synchronously grouting shield tunnel pipe sheet, solving the problem that the grouting effect in enriched water stratum is poor in the existing grouting method. The method for synchronously grouting shield tunnel pipe sheet provided by the invention comprises the following steps: A, horizontally and synchronously pouring mortar from the back of theliner building of the pipe sheet in the process of shield excavating; and B, pouring quick congealing mixture liquid to the back of the liner building of the pipe sheet while synchronously pouring the mortar. In the method and the device for synchronously grouting shield tunnel pipe sheet, the quick congealing mixture liquid and the mortar can be mixed and congealed rapidly, thereby efficiently preventing the pipe sheet from floating upwards, ensuring the initial stability of the liner building of the pipe sheet, preventing the water from flowing to the tail of the shield while opening a cabin to replace cutter in the hard rock construction for a long distance, and ensuring the construction effect.

The invention relates to a thread implant which is characterized in that the thread implant comprises a cylindrical implant; the edge of the top of the implant is provided with smooth chamfers; the upper part of the implant is provided with a fine external thread with the thread tooth profile of isosceles trapezoid; the lower part of the implant is provided with an external thread with the thread tooth profile of trapezoid; the thread depth of the trapezoid external thread is gradually shoaled from bottom to top; the bottom of the implant is a spherical surface; the lower part of the trapezoid external thread of the implant is uniformly provided with three vertical cutting trough; the center of the top of the implant is provided with a truncated cone hole below which a regular octagonal hole is arranged; an internal thread blind hole is arranged below the regular octagonal hole. The thread implant is provided with excellent initial stability effect, is beneficial for the long-term stability of the implant, has high implant structure safety coefficient, is beneficial for the combination of gum and implant, can effectively restrict the adsorption of bacilli, and can be widely applied to various restoration process of denture implant due to tooth loss.

The invention discloses a self-adaptive adjustable device arranged on a maritime cruising search and rescue unmanned ship. The self-adaptive adjustable device comprises an environment information collecting module, a data processing communication module and an adjustable buoyancy tank executing module; the adjustable buoyancy tank executing module comprises adjustable buoyancy tanks symmetrically arranged on the two sides of the ship and telescopic slide rails, and the telescopic slide rails are used for being stretched out and drawn back towards the outer sides or the inner sides of the ship; each telescopic slide rail is provided with a driving device body, an output shaft of each driving device body is connected with one end of a corresponding rotary bracket, and the other end of each rotary bracket is connected with the corresponding adjustable buoyancy tank; and the driving device bodies are used for controlling the draft of the adjustable buoyancy tanks. When an unmanned plane takes off or lands on the unmanned ship, the adjustable buoyancy tanks are spread, the initial stability of the unmanned ship is improved, overturn is avoided, and the stable performance of the unmanned ship is improved; and when the unmanned ship needs to conduct cruising search and rescue or carry the unmanned plane and return, the adjustable buoyancy tanks can be drawn back, and the sailing performance of the unmanned ship is fully achieved.

A data receiving apparatus having a digital contents copy protection function and a method for controlling the same are disclosed, in which authentication for the digital contents copy protection function is carried out without any error even if time difference occurs due to a communication error of the data receiving apparatus or a problem in initial stability. The data receiving apparatus having a digital contents copy protection function includes an interface connected with a data transmitting apparatus, transmitting basic information for determining whether authentication for the digital contents copy protection function has been carried out, a display receiving digital contents from the data transmitting apparatus and outputting them if the authentication for the digital contents copy protection function has been carried out successfully, and a controller controlling the data transmitting apparatus so as to determine again whether the authentication for the digital contents copy protection function has been carried out, after a lapse of a predetermined time period, if the authentication for the digital contents copy protection function has been failed.

The invention discloses total-knee-joint replacement prosthesis which comprises a femoral condyle, a tibia support, a tibia pad and a patella. The femoral condyle comprises an internal condyle, an external condyle, a joint surface, an intercondylar box and a condyle inside joint internal surface. The tibia pad is provided with a limiting stand column and glenoid cavities. The glenoid cavities define the shape of a glenoid cavity face. The shape of the glenoid cavity face is matched with the articular surface of the femoral condyle. The lower end face of the tibia pad is provided with a first groove and a second groove. The tibia support comprises a supporting disk with a fixing component. The upper surface of the supporting disk is provided with a first supporting pillar and a second supporting pillar which are matched with the tibia pad in a locked mode. The patella comprises a patella articular surface and a patella fixing stand column. The total-knee-joint replacement prosthesis has very good initial stability and long-term use stability, biocompatibility is improved, metabolism of bones is facilitated, resistance to subsidence of the tibia support, resistance to revolving resistance and long-term use stability are improved, the binding force of the tibia support and the tibia pad is further improved, and the service life of the knee joint is further prolonged.

The invention discloses a biological-type knee joint partition bone trabecula tibial plateau. The biological-type knee joint partition bone trabecula tibial plateau comprises a reniform plateau bearing part, a handle is arranged in the middle of the lower surface of the reniform plateau bearing part, parts, except the connecting handle, of the lower surface of the reniform plateau bearing part areprovided with bone trabeculae, and the reniform plateau bearing part is divided into an inner side area, a middle area and an outer side area; the hole diameter and porosity of the bone trabeculae inthe inner side area are larger than those of the bone trabeculae in the outer side area and the middle area in sequence. The partition bone trabecula tibial plateau is integrally formed through 3D printing of titanium alloy, and the hole diameters and porosities of the bone trabeculae arranged in different areas of the lower surface of the tibial plateau are different. An experiment proves that through partition arrangement of the bone trabecula of the biological-type knee joint tibial plateau, under the actual circumstance of uneven stress of the tibia, uniform bone ingrowth is achieved, andthe long-time stability of the biological-type tibial plateau is improved. through 3D printing, the surface of the whole component is rough, friction between the plateau and the tibia is increased, and the initial stability of the plateau is improved.

The invention provides a self-tapping dental implant. The self-tapping dental implant comprises a body, wherein the body is successively provided with a neck part, a body part, a root and a bottom from top to bottom in an adjoining manner; the neck part is a cylinder; the outer surface of the neck part is provided with a four-ring circular groove; the body part is a first tapered thread section; the root is a second tapered thread section; the thread tapers of the first tapered thread section and the second tapered thread section are different; three slant self-tapping cutting grooves are uniformly distributed in the periphery of the outer surface of the root; the bottom is a sphere; an open inner cavity is vertically formed in the radial middle part of the body; the inner cavity is successively provided with reverse tapered bores, regular polygon bores, cylindrical bores and inner threaded bores from top to bottom in an adjoining manner; the diameter of each cylindrical bore is the same as that of an inscribed circle of each regular polygon bore. The self-tapping dental implant has the function of platform transferring; due to the design of double tapers and arrangement of cutting grooves, implanting operation can be performed more easily, the initial stability of tooth implantation is improved, and the bone loss is reduced to the maximum extent. The matching of inner conical surfaces and the base station achieves the sealing effect to prevent micro leakage.

The invention discloses a normal-pressure, pressurizing and high-pressure die locking loop of a two-plate hydraulic injection molding machine. The normal-pressure, pressurizing and high-pressure die locking loop of the two-plate hydraulic injection molding machine comprises a die locking hydraulic cylinder, a pressurizing hydraulic cylinder, a two-position three-way reversing valve, a die locking oil line two-position three-way reversing valve and a die locking oil line one-way valve. The normal-pressure, pressurizing and high-pressure die locking loop of the two-plate hydraulic injection molding machine is characterized in that a pressure oil pipe is connected with a pressure side oil hole P of a three-position four-way reversing valve through a first branch pressure oil pipe; a right end upper side oil hole A of the three-position four-way reversing valve is connected with an oil hole of a rodless cavity of a large oil cylinder of the pressurizing hydraulic cylinder; a left end upper side oil hole B of the three-position four-way reversing valve is communicated with a rod cavity of a small oil cylinder of the pressurizing hydraulic cylinder through a communication oil pipe; meanwhile, the left end upper side oil hole B of the three-position four-way reversing valve is also communicated with a rodless cavity of the small oil cylinder of the pressurizing hydraulic cylinder through a second branch oil pipe. The normal-pressure, pressurizing and high-pressure die locking loop of the two-plate hydraulic injection molding machine is simple in structure and easy to operate, has two functions of locking a die under the normal pressure and locking the die under the high pressure, and is capable of locking the die, reducing the impact buffer on a contact surface of the die by virtue of locking the die under the normal pressure, and meeting the requirement of initial stability of the die locking process.

The invention relates to a combined ankle-preserving and knee-preserving tibial shaft prosthesis, including a proximal tibial abutment and a mating segment prosthesis, wherein the base of the proximaltibial abutment is connected to the top of the mating segment prosthesis. The top of the proximal tibial abutment is provided with a bone trabecular structure the top surface center of which is provided with a groove, and the side of the proximal tibial abutment is provided with a plurality of U-shaped nail holes and a plurality of suture holes so as to reconstruct the patellar tendon and save the knee joint movement function. Two nail tracks are arranged side by side on both sides of the proximal tibial abutment. As that bone trabecular structure is use at the top of the proximal tibial abutment, the bone growth can be promoted, the groove on the top surface of the bone trabecular structure facilitates convenient insertion of cancellous bone, the artificial bone trabecula and the bone can be tightly combined, the purpose of reserving the epiphysis can be achieved, the bone growth ability of the child due to the epiphysis removal or destruction can be reduced, and the lower limb deformity can be avoided; The initial stability and long-term stability can be achieved by screw fixation, and the operation time and difficulty can be greatly reduced at the same time.

The invention discloses an acetabular cup having a bone-like trabecular structure layer. The acetabular cup is formed by a metal substrate and a porous layer; plural micropores arranged on the insideand outer surface of the porous layer; plural fixing teeth are arranged on the periphery of the porous layer; the porous layer is arranged on the periphery of the metal substrate; the metal substrateis provided with fixing nail holes and an installation hole; the fixing nail holes and the installation hole all pass through the metal substrate and the porous layer; and the metal substrate is a hollow hemisphere. The acetabular cup adopts a bone-like trabecular structure so that the cup can adapt individual patients, and the bonding strength after implantation of the prosthesis and initial stability can be guaranteed; through the adoption of a selective laser fusion molding technology, high molding precision can be achieved, fast molding and prototyping can be realized, design periods can be shortened, and the urgency of patient demands can be met by cooperating different demands of individuals; and the orientation of the fixing nail holes can be freely adjusted to achieve the most ideal fixing nail hole position design, and the acetabular cup is simple in structure and easy to use.