US 12,380,812 B2
Method for reproducible production of defined bone fractures
Robert Holz, Cologne (DE); and Marc Ebinger, Cologne (DE)
Assigned to RIMASYS GMBH, Cologne (DE)
Appl. No. 16/321,320
Filed by RIMASYS GMBH, Cologne (DE)
PCT Filed Jul. 29, 2016, PCT No. PCT/EP2016/068217
§ 371(c)(1), (2) Date Jan. 28, 2019,
PCT Pub. No. WO2018/019390, PCT Pub. Date Feb. 1, 2018.
Prior Publication US 2021/0012681 A1, Jan. 14, 2021
Int. Cl. G09B 23/30 (2006.01)
CPC G09B 23/306 (2013.01) 6 Claims
OG exemplary drawing
 
1. A method for producing a prepared specimen comprising a defined bone fracture with accompanying soft tissue injuries in a donor specimen, the donor specimen comprising a hand, a lower arm and an upper arm, the donor specimen being severed from a deceased human donor distal the upper arm, the donor specimen further comprising bone and soft tissue mantle, the soft tissue mantle comprising at least muscles, ligaments, tendons, joint capsules, nerves, skin and vessels, wherein the defined bone fracture is a defined distal radius fracture with accompanying soft tissue injuries,
wherein a device is provided which comprises:
i. at least one guide column,
ii. at one end of the guide column a base plate,
iii. a traverse with impact punch,
iv. at least one means for adjusting a damping to which the specimen is exposed during the impact of the defined mass,
v. at least one clamping plate for securing the donor specimen,
vi. a mass and optionally an additional weight for adjusting a defined mass, the defined mass being 16.6 to 23.1 kg;
vii. at least one further traverse with at least one releasable holding mechanism for positioning the defined mass; and
viii. means for securing the donor specimen within the device,
wherein, the method comprises:
a) orienting the donor specimen in a defined geometry with respect to the direction from which the defined mass impacts with the donor specimen when the holding mechanism is released, with the aid of the means for securing the donor specimen, in one of the following positions:
wherein the cut surface of the humerus is positioned centrally under the point of attack of the force, the humeroulnar joint is flexed from maximum extension by 0 to 8 degrees and in this position the forearm is rotated from maximum supination to pronation of 45 to 52 degrees, or wherein the cut surface of the humerus is positioned centrally under the point of attack of the force, the humeroulnar joint is flexed from maximum extension by 10 to 12 degrees and in this position the forearm is rotated from maximum supination to pronation of 50 to 60 degrees, or wherein the cut surface of the humerus is positioned centrally under the point of attack of the force, the humeroulnar joint is flexed from maximum extension by 10 to 12 degrees and in this position the forearm is rotated from maximum supination to pronation of 60 to 70 degrees;
b) defining a speed at which the defined mass impacts with the donor specimen when the holding mechanism is released is adjusted to 76 to 110 cm by means of the falling height of the defined mass,
c) defining a compression to which the donor specimen is exposed upon impact of the defined mass when the holding mechanism is released is adjusted to 20 to 36 mm by means for adjusting the damping during the impact of the mass,
d) defining a damping with which the defined mass is braked upon impact with the donor specimen when the holding mechanism is released is adjusted to 5 to 17 mm as the damped portion of the defined compression,
e) releasing the holding mechanism, and
f) removing the prepared specimen from the device.