Computational and experimental models of the human torso for non-penetrating ballistic impact.

A patient-specific bone implant has a porous body with a core material covered with tantalum. It is made with unique outer dimensions selected to match a specific patient.

Patient-specific implants with improved osseointegration

A prosthetic dental device comprised of a composite material including a polymer material and a ceramic material mixed within the polymer material. In one embodiment, the ceramic fillers are substantially, homogeneously dispersed within the polymer material. In one embodiment, the ceramic material is bonded to the polymer material through a coupling agent. In addition, the prosthetic dental device can be comprised of a different composite material. This composite material includes a ceramic matrix having pores and an organic material infiltrated into the pores. To construct the ceramic matrix, ceramic particles, a binder material, and a porogen material are mixed to create a composite material which is then molded and heated to create a substantially rigid ceramic structure. At least some of the binder material and the porogen material are evaporated during the heating step to create pores in the matrix which are filled with the organic material.

Prosthetic dental device

A modular implant includes a head, an intermediate part configured to engage bone, and an initially separate anchor configured to engage the head so that at least the head and the anchor cooperatively secure the intermediate part on the implant to form the modular implant. At least one of the head, the intermediate part, and the anchor has a plurality of forms, and each form is configured to be assembled on at least one form of the other two of the head, intermediate part, and anchor. The intermediate part may include a porous metal such as tantalum.

Modular implant with secured porous portion

An implant which includes a shaft made of a first material and having an exterior surface, and at least one thread made of a second material different from the first material, engaging the exterior surface, and extending outwardly from the exterior surface for engaging bone. After implantation of the implant, bone tissue may osseointegrate into the porous shaft to anchor the implant within the surrounding bone. The first material may be a porous metal and include tantalum while the second material is non-porous.

Porous implant with non-porous threads

A bone substitute for use in impact testing of a structure simulating the human body which includes a member fabricated from epoxy resin and having a lengthwise dimension, and a fiberglass sheath embedded in an outer circumferential portion of the member, the sheath having glass fibers oriented along the length of the member.

Synthetic cortical bone for ballistic testing

This paper describes the development ofa synthetic bone material with mechanical properties - stiffness, strength, and fracture toughness - similar to human cortical bone at low strain rates. The bone substitute was developed in this study by adding milled fiberglass in volume and fiberglass sleeves to an epoxy base material in an attempt to increase its strength, fracture toughness, and stiffness. The mechanical properties of the epoxy system and effects of fiberglass on those properties were evaluated by testing bars of the material in bending at 3 x 10 -4 s -1 and cylinders in compression at 1.5x10 -3 s -1 . During the development process, results of mechanical tests were continually compared to published data on bone properties. It was found that adding milled fiberglass suspended in the epoxy base decreased the stiffness and strength. However, bonding a fiberglass sleeve around the outside of the samples increased their stiffness, bending strength and fracture toughness, resulting in a material with mechanical properties closer to that of human bone. The rib cage of a Human Surrogate Torso Model (HSTM) used for ballistic and blast studies will be constructed of the synthetic material, properties of which are used as inputs to a finite-element model (FEM) of a human torso. Using the material developed in this study as the base formulation, future work will continue the process to achieve properties similar to human bone at higher strain rates (10 1 s -1 to 10 3 s -1 ) using a split-Hopkinson bar technique.

Development of synthetic cortical bone for ballistic and blast testing

Thin-film electrodes and battery cells, and methods of fabrication. A thin film electrode may be fabricated from a non-metallic, non-conductive porous support structure having pores with micrometer-range diameters. The support may include a polymer film. A first surface of the support is metalized, and the pores are partially metallized to create metal tubes having a thickness within a range of 50 to 150 nanometers, in contact with the metal layer. An active material is disposed within metalized portions of the pores. An electrolyte is disposed within non-metalized portions of the pores. Active materials may be selected to create an anode and a cathode. Non-metalized surfaces of the anode and cathode may be contacted to one another to form a battery cell, with the non-metalized electrolyte-containing portions of the anode facing the electrolyte-containing portions of the cathode pores. A battery cell may be fabricated as, for example, a nickel-zinc battery cell.

Thin Film Electrodes and Battery Cells, and Methods of Fabrication

An implement for use in prison environments which is not reformable into a weapon and including at least a body having a proximal handle portion and a distal operational portion is provided. The body is non-sharpenable and fabricated from a non-meltable material, and has frangible means for limiting body strength by facilitating structural failure of the body upon application thereto of a force exceeding a predetermined magnitude.

Safe products for prisoners using non-reformable materials

A shaving implement includes a handle fabricated from a soft, flexible and non-meltable material incapable of taking an edge or a point capable of penetrating human skin, and a frangible razor blade.

Gary E. Peck

Papers

Synthetic cortical bone for ballistic testing

Development of synthetic cortical bone for ballistic and blast testing

Thin Film Electrodes and Battery Cells, and Methods of Fabrication

Safe products for prisoners using non-reformable materials

Safe Shaving Implement for Prisoners Using Non-reformable Materials