| 54 |
Title |
TI |
[EN] DOUBLE ACTING HYDRAULIC PISTON CYLINDER UNIT |
| 71/73 |
Applicant/owner |
PA |
OTTO BOCK ORTHOPADISCHE INDUSTRIE KG
|
| 72 |
Inventor |
IN |
HORVATH, EDUARD, ING.
|
| 22/96 |
Application date |
AD |
Sep 21, 1988 |
| 21 |
Application number |
AN |
88890241 |
|
Country of application |
AC |
EP |
|
Publication date |
PUB |
Oct 18, 1989 |
33
31
32 |
Priority data |
PRC
PRN
PRD |
AT
239987
19870922
|
| 51 |
IPC main class |
ICM |
A61F 2/50
|
| 51 |
IPC secondary class |
ICS |
|
|
IPC additional class |
ICA |
|
|
IPC index class |
ICI |
|
|
Cooperative patent classification |
CPC |
A61F 2/68
A61F 2/74
|
|
MCD main class |
MCM |
F01B 19/04
(2006.01)
|
|
MCD secondary class |
MCS |
A61F 2/68
(2006.01)
A61F 2/74
(2006.01)
F01B 23/00
(2006.01)
|
|
MCD additional class |
MCA |
|
| 57 |
Abstract |
AB |
[EN] A double-acting hydraulic piston-and-cylinder unit adapted to constitute a damper for movements in a human joint prosthesis has a boot sealingly connected to the cylinder and the piston rod to receive the hydraulic fluid under pressure as the hydraulic fluid is displaced from one or the other of two cylinder chambers upon displacement of the piston rod. The boot has a conically widening region or segment sealingly secured to the rod and adjoining the cylindrical segment of the boot surrounding the cylinder in a transition segment formed as an outwardly convex bulge and designed to ensure that initial inward movement of the piston rod will give rise to a plate membrane deformation of the elastic boot while only further displacement will result in a rolling action of the membrane. This ensures a generally cylindrical uniform configuration of the boot in all positions of the rod as is essential for effective use in a prosthesis. |
| 56 |
Cited documents identified in the search |
CT |
DE000001491236B
AT000000379000B
EP000000097226A1
|
| 56 |
Cited documents indicated by the applicant |
CT |
|
| 56 |
Cited non-patent literature identified in the search |
CTNP |
|
| 56 |
Cited non-patent literature indicated by the applicant |
CTNP |
|
|
Citing documents |
|
CN000118026026A
DE000004328696A1
DE000019735857A1
DE102005030407B3
DE102008009443A1
DE102018131698A1
US000008317874B2
WO002009006886A2
WO002009006886A3
WO002020120509A1
|
|
Sequence listings |
|
|
|
Search file IPC |
ICP |
A61F 2/68
|
