Patent US4674485A successfully refreshed from Google Patents.
US4674485A
Expired / Lapsed
US
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Patient controllable traction device
Assignee: Individual
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Filing: 1985-06-03
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Granted: 1987-06-23
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Expires: 2005-06-03
Abstract
Abstract A patient controlled traction device in which a mechanical advantage pulley system is used to multiply the traction applied by a weight and in which a mechanical advantage pulley system is used to enable the patient to relieve the force of the traction by the application of a relatively small force, substantially less than the weight utilized.
Inventors
- 👤 Robert E. Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:36
CPC Classifications
A; A61; A61H; A61H1/00; A61H1/02; A61H1/0218; A61H1/0229; A61H2203/00; A61H2203/04; A61H2203/0443; A61H2203/0456; A63; A63B; A63B21/00; A63B21/06; A63B23/00; A63B23/035; A63B23/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
160 words
A patient controllable traction device, comprising traction applying means, a support, a first mechanical advantage pulley system supported by said support, said pulley system supporting the traction applying means from said support, said first pulley system having a first flexible connection with a weight supporting end, a weight supported from said weight supporting end, said first pulley system including means to multiply the force applied to the traction applying means by the weight through the first pulley system, and a second mechanical advantage pulley system including means for partially supporting the weight from said support, said second pulley system having a second flexible connection with a patient controllable end and an end fixed to said support, said second pulley system including means to multiply the force exerted by the patient, so that when a relatively small force is exerted by the patient, the weight will be partially supported by the patient exerted force and will relieve a greater traction force.
Claim 2
Dependent Claim
160 words
A patient controllable traction device, comprising traction applying means, a support, a first mechanical advantage pulley system supported by said support, said pulley system supporting the traction applying means from said support, said first pulley system having a first flexible connection with a weight supporting end, a weight supported from said weight supporting end, said first pulley system including means to multiply the force applied to the traction applying means by the weight through the first pulley system, and a second mechanical advantage pulley system including means for partially supporting the weight from said support, said second pulley system having a second flexible connection with a patient controllable end and an end fixed to said support, said second pulley system including means to multiply the force exerted by the patient, so that when a relatively small force is exerted by the patient, the weight will be partially supported by the patient exerted force and will relieve a greater traction force.
Claim 3
Dependent Claim
184 words
A patient controllable traction device comprising traction applying means, a support, a weight, a first mechanical advantage pulley system having a first flexible connection fixed at one end to the support and connected to the weight at the other end, said first mechanical advantage pulley system being supported by the support, said first pulley system supporting the traction applying means, the mechanical advantage of said first mechanical advantage pulley system including means to multiply the force applied to the traction applying means by the weight through the pulley system, and a second mechanical advantage pulley system having a second flexible connection fixed at one end to the support and controllable by the patient at the other end, said second mechanical advantage pulley system being supported by the support, said second pulley system supporting the weight, the mechanical advantage of said second mechanical pulley system including means to multiply the force applied by the patient so that when a relatively small force is exerted by the patient the weight will be partially supported by the patient exerted force and will relieve a greater traction force.
Claim 4
Dependent Claim
184 words
A patient controllable traction device comprising traction applying means, a support, a weight, a first mechanical advantage pulley system having a first flexible connection fixed at one end to the support and connected to the weight at the other end, said first mechanical advantage pulley system being supported by the support, said first pulley system supporting the traction applying means, the mechanical advantage of said first mechanical advantage pulley system including means to multiply the force applied to the traction applying means by the weight through the pulley system, and a second mechanical advantage pulley system having a second flexible connection fixed at one end to the support and controllable by the patient at the other end, said second mechanical advantage pulley system being supported by the support, said second pulley system supporting the weight, the mechanical advantage of said second mechanical pulley system including means to multiply the force applied by the patient so that when a relatively small force is exerted by the patient the weight will be partially supported by the patient exerted force and will relieve a greater traction force.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-22 | 1990-12-22 | 1991-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-22 | 1994-12-22 | 1995-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-22 | 1998-12-22 | 1999-06-23 | $7700.00 | Window Closed / Lapsed |