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751 results about "Soft layer" patented technology

Hydrogel-based prosthetic device for replaceing at least a part of the nucleus of a spinal disc

The present invention is a prosthetic for replacement of at least a part of the nucleus of a intravertebral disc. The prosthetic device is composed of at least two essentially parallel soft layers of an elastically deformable hydrogel and at least one rigid layer, the rigid layer having less compressibility than the soft layers, being adjacent to the soft layers, parallel to them, and firmly attached to them. In some embodiments, the soft layers have the same thickness and composition. Typically, the prosthesis has more than one rigid layer and these rigid layers have the same thickness and composition. The number of soft layers is usually one more than the number of rigid layers, with, e.g., at least three soft layers. The invention also includes a method of prosthesis production, which involves prefabricating soft and rigid layers; stacking at least two prefabricated soft and at least one prefabricated rigid layer in a parallel fashion into their final form, and, permitting the layers to firmly connect to one another by mutual interaction. In this method, at least one type of the layers is prefabricated in the dehydrated state, which is done by dehydrating stretched foil in an apparatus preventing its contraction and thereby decreasing its area. There is at least partial dehydration of the prosthesis under pressure applied in a direction tangent to the planes of the layers. In preferred embodiments, while in the state of almost full dehydration, is sterilized using ionizing radiation or a gaseous chemical agent, after which it is partially rehydrated within the sterile wrapper using water vapor.
Owner:REPLICATION MEDICAL

Clamp for holding and efficiently removing heat from workpieces

The invention described in this disclosure is an apparatus and method for clamping semiconductor wafers or other substrates or workpieces during etching, CVD, or surface modification processes. The purpose of the invention is to achieve improved heat transfer during processing between the wafer/substrate and a temperature controlled pedestal used for supporting it in the process chamber. The typical level of process heat put into the wafer during plasma-based etching or deposition processes will be up to about 10 Watts per centimeter squared while the maximum acceptable temperature differential between wafer/substrate and pedestal is less than about 100 Celsius. In such low gas pressure environments typical for plasma-based processes, the heat removal from the wafer/substrate by gaseous conduction may be inadequate to meet requirements. This invention achieves excellent heat transfer to the pedestal from the wafer/substrate when there is a thin, resilient, electrically insulating layer (tape) bonded to the wafer/substrate or the pedestal. Wafer/substrate clamping for improved process heat removal is achieved by a combination of vacuum clamping of the wafer/substrate beginning prior to evacuation of the processing chamber, along with or followed by electrostatic clamping of the wafer/substrate which continues during processing. The invention also permits the wafer/substrate to be rapidly and safely released from the electrostatic clamping when the chamber is returned to atmospheric pressure by a providing a slight pressure increase, above atmospheric pressure, between wafer and pedestal. The pedestal may have some roughening or narrow grooves on the wafer clamping surface, and some small holes from its surface leading to an evacuated plenum or channel within the pedestal. Alternatively, the pedestal may have a layer of a porous metal extending from its surface down to the evacuated channel or plenum which permits gas to be evacuated. These structures allow vacuum pumping of gas that might otherwise be trapped between the insulating layer and the pedestal. When a wafer/substrate is placed on the pedestal by loading at atmospheric pressure, vacuum pumping through the pedestal is commenced. This causes the workpiece to be pressed to the pedestal clamping surface with approximately atmospheric pressure compressing the soft layer against its clamping surface. This provides sufficient contact of the soft layer with the pedestal to greatly improve heat transfer from the wafer/substrate to the pedestal. A voltage is applied to the pedestal, beginning any time after the wafer is on the pedestal, to further clamp the wafer electrostatically. As the processing chamber is then pumped down to operating pressure for processing the electrostatic clamping voltage maintains sufficient pressure of the wafer/substrate against the pedestal to maintain the heat conductive contact between the soft layer and the pedestal. This permits good heat conduction to be maintained during the low pressure plasma-based etching or CVD processing. Following processing when the wafer/substrate is to be removed it may be rapidly de-clamped from the electrostatic clamping by application of a slight over-atmospheric pressure in the reservoir or pumping channels within the pedestal.
Owner:SAVAS STEPHEN EDWARD +1

Bionics machine acaleph driven by shape-memory alloy wire

The invention discloses a biomimetic mechanical jellyfish that is driven by shape memory alloy wires, relates to a biomimetic mechanical jellyfish and aims at solving the problems that the existing biomimetic mechanical jellyfishes only simulate jellyfish actions, do not cover devices such as a drive device and the like, and have complex structure and the biomimetic effect that is totally different with the action principle of real jellyfishes. The biomimetic mechanical jellyfish has following structure: an action unit (10) consists of the shape memory alloy wires (12), an elastic body (13), a coating skin (15) and a substrate (16), the substrate (16) and the shape memory alloy wires (12) are fixedly arranged on the elastic body (13), the action unit (10) is coated inside an umbrella-like soft layer (11), the coating skin (15) covers outside the shape memory alloy wires (12), the substrate (16) and a sealing cover (3) are fixedly connected with a supporting body (2), a power source (7), a control device (5), a communication device (6) and a sinking and floating control device (9) are fixedly arranged on the supporting body (2), and the power source (7) provides electricity respectively to the control device (5), the communication device (6) and the shape memory alloy wires (12). The biomimetic mechanical jellyfish has simple structure, lightness, low production cost, large action range and good biomimetic effect.
Owner:HARBIN INST OF TECH

Soft rock strata grouting elevating method compensating for building settlement caused by subway tunnel under crossing

PendingCN108842840AAvoid excessive subsidenceAvoid damageSoil preservationDiseaseSoft layer
The invention discloses a soft rock strata grouting elevating method compensating for building settlement caused by subway tunnel under crossing, and aims at the treating the earth surface building settlement disease caused by subway tunnel construction. The method comprises the steps that firstly, elevating grouting soft layer selection is conducted; secondly, soft layer pre-strengthening is conducted; thirdly, soft layer escape stop curtain construction is conducted; and fourthly, soft layer grouting elevating is conducted, and it is ensured that the building settlement value and the settlement difference do not exceed the allowed value. Through the technology that ring-direction grouting is conducted on the periphery of a soft layer to construct a stratum escape stop curtain, damage tothe native foundation due to the grouting elevating construction is avoided, and the requirement for elevating grouting equipment is effectively lowered; and the grouted soft layer is prevented from sliding and escaping towards the periphery under the load action of an overlying strata and the earth surface building, and the construction technology compensating for subway tunnel under crossing building settlement based on soft layer grouting elevating is developed.
Owner:HUNAN UNIV

Overlaying-ring ring shear apparatus as well as overlaying ring shear test

The invention belongs to the field of geotechnical test and deformation simulation, and particularly relates to an overlaying-ring ring shear apparatus and an overlaying ring shear test for continuouslarge-displacement shear deformation characteristic research of soil and complicated structural soil deformation simulation. The overlaying-ring ring shear apparatus comprises a vertical pressurizingmechanism, a twisting mechanism, a vertical assisting pressure applying mechanism and an overlaying ring shear box mechanism; the overlaying ring shear box mechanism is arranged on the twisting mechanism and can be driven by the twisting mechanism to rotate; the vertical pressurizing mechanism can apply vertical pressure to the overlaying ring shear box mechanism by virtue of the vertical assisting pressure applying mechanism; the limitless deformation ring-shaped shear of different geotechnical test samples of different heights can be performed, and the test sample is enabled to have certainfreedom and continuity in the deformation process; and the overlaying-ring ring shear apparatus can also be used for researching a deformation law of different material contact surfaces, simulating long-distance deformation of the complicated structural soil landslide as well as searching soft layers.
Owner:FUJIAN GEOLOGICAL ENG SURVEY INST
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