Patent EP0488322A1 successfully refreshed from Google Patents.
EP0488322A1
Expired / Lapsed
EP
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Medical soft equipment and its means and instruments for controlling curvature
Assignee: Individual
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Filing: 1991-11-28
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Granted: —
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Expires: 2011-11-28
Abstract
Abstract The medical soft equipment and its means and instruments for controlling curvature relates to a piece of curvature controlling equipment of the kind which includes a pressure source, a pressure control unit as well as a soft tube (1) with one or more pressure control cavity or cavities (2) positioned inside, which is conductive to fluid pressure-transmitting medium. By using the pressure source, the pressure control unit, a kind of fluid pressure-transmitting medium and the soft tube with the pressure control cavity or cavities, differential pressures inside the cavity can be used to control the curvature of the needed part of the medical soft equipment.
Inventors
- 👤 Lee Haojun
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 20:50
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/0021; A61M25/0041; A61M25/0043; A61M25/0054; A61M25/01; A61M25/0105; A61M25/0133; A61M25/0155
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
A kind of medical soft equipemnt, characterized in that inside the soft tube (1) of the medical soft equipment as shown in the accompanying drawings is at least one pressure control cavity (2)--an inner longitudinal cavity with either the distal or tip end sealed and its mouth connected to the pressure source, and between the curvature in the needed part of the medical soft equipment and the pressure inside the pressure control cavity (2) there exists a specific functional relationship.
Claim 2
Dependent Claim
132 words
The medical soft equipment according to Claim 1, characterized in that said soft tube (1) is a kind of thin-walled, hollow angle pipe or spiral tube with one end sealed and a oblate or oval cross section, and its hollow cavity can be used as pressure control cavity (2), or as both pressure control cavity (2) and function cavity, and when the inside of the press control cavity (2) is in a state of being pressed, the soft tube (1) is tending to have a round cross section, and a tractive stress appears along the outer edge of the bending part of the soft tube (1) and along the inner edge an expansion stress occurs, and with the increase of the pressure, the soft tube (1) is tending to stretch straight out.
Claim 3
Dependent Claim
58 words
The medical soft equipment according to Claim 1, characterized in that said soft tube (1) is a one-end-sealed soft tube with at least one eccentric pressure control cavity (2) and a central function cavity (3), and when the pressure control cavity (2) is in a state of being pressed ,the soft tube (1) is tending to be straightened.
Claim 4
Dependent Claim
61 words
The medical soft equipment according to Claim 1,characterized in that in said soft tube (1), there installed two or more pressure control cavities (2), which are separated by a neutral or separating layer between them, and when the pressure inside the pressure control cavities is in an unbalanced state, the soft tube (1) shall curve to the side of lower pressure.
Claim 5
Independent Claim
104 words
A method of the medical soft equipment for controlling curvature, characterized in controlling the curvature by using a pressure source, a pressure control unit, a kind of fluid pressure-transmitting medium and a piece of medical soft equipment with a pressure control cavity, the inner pressure of which can be used to change the curvature of the equipment and controlled by the specific functional relatiomship between the curvature in the needed part of the medical soft equipment and the pressure inside the pressure control cavity (2), thus making the curvature suit each position in the cource that the medical soft equipment gets into the body.
Claim 6
Dependent Claim
132 words
The method of the medical soft equipment for controlling curvature according to Claim 2 and Claim 5, characterized in exercising control over the pressure inside the pressure control cavity and the curvature in the needed part of the medical soft equipment in accordance with the following function relationship: and in the formula, Δα stands for the point turning angle; K, empirical constant determined by a certain number of model tests; E, the elastic modulus of the material; α, the bending angle of the whole medical soft equipment; p, the pressure difference between the inner and the outer side of the pressure control cavity; A and B stand respectively for the length of the major and the minor axis of the cross section; t, the thickness of the wall; R, the bending radius.
Claim 7
Dependent Claim
141 words
The method of the medical soft equipment for controlling curvature according to Claim 3 and Claim 5, characterized in controlling the pressure inside the pressure control cavity (2) and the curvature in the needed part of the medical soft equipment in accordance with the following functional relationship: and in the formula, Δα stands for the terminal turning angle; K, empirical constant determined by a certain number of model tests; E, the elastic modulus of the material; α, the bending angle of the whole medical soft equipment; P, the pressure difference between the inner and the outer side of the pressure control cavity; e, the eccentricity of the pressure control cavity; R o , the curvature radius of the curve formed by connecting the central points of the cross sections; R, the curvature radius of the neutral layer or the separating layer.
Claim 8
Dependent Claim
138 words
The method of the medical soft equipment for controlling curvature according to Claim 4 and Claim 5, characterized in that the control of the pressure inside its pressure control cavities (2) and the curvature in the needed part of the medical soft equipment can be realized in accordance with the following function relationship: and in the formula, W stands for distal displacement; K, empirical constant determined by a certain number of model tests; p, the pressure difference between the inner and the outer side of the pressure control cavity; E, the elastic modulus of the material; n, the ripple value; R o , the convex curvature radius of the bellows; R l , the concave curvature radius of the bellows; r o , the radius of the ripple arc; t, the thickness of the wall; β, the tightness.
Claim 9
Dependent Claim
58 words
An instrument of the medical soft equipment for controlling curvature, characterized in including a pressure source and other pressure-controlling devices, among which, a. the pressure source can be either a forcing pump, a spring plunger or any other pressure-generating instruments; b. the pressure-controlling devices can be either a pressure-adjusting volve, a spring adjuster or a fluid control system.
Claim 10
Dependent Claim
41 words
The instrument of the medical soft equipment for controlling according to Claim 1 and Claim 9, characterized in that the original air-supplied and water-supplied pumping system can be used as the pressure source for the medical soft equipment with an endoscope.
References Cited (Backward Citations)
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