Supports – Brackets – Adjustable
Patent
1996-06-21
1999-07-06
Berger, Derek J.
Supports
Brackets
Adjustable
24828851, 269 74, E04G 300
Patent
active
059188448
DESCRIPTION:
BRIEF SUMMARY
A great many medical or surgical interventions necessitate the use of several instruments which cannot be manipulated by just one individual. Such is especially the case in endoscopy or coelioscopy interventions.
It is therefore necessary to involve several operators, even if the function performed by some of the operators is very minor and consists simply in holding an instrument in a defined position. Apart from the fact that this operation is of little interest for an assistant to carry out, the presence of the assistant causes considerable inconvenience on account of the confined space in the medical operating theatres or units, and it is for this reason that it has been envisaged to use apparatuses which support instruments.
At present there are brackets which are fixed on the operating table and which can be adjusted by means of nut and screw systems. On account of the necessary manipulations of the blocking means, the adjustments are difficult and long, which means that any advantage of this type of apparatus is lost.
It has been envisaged to use devices having a flexible arm, for example having rings lying with friction one upon the other (of the flexible shower type). However, such devices do not permit a precise positioning and they do not remain in the position given to them when a force is exerted.
The documents EP-A-0,167,345 and U.S. Pat. No. 4,930,932 each concern a device including means, for attachment to an operating table or the like, which means are connected to means for supporting a medical or surgical instrument via an arm, in which at least one proximal segment of the arm consists of a succession of balls and cylindrical elements serving as socket seats for the balls and arranged alternatingly, means for axial compression of the arm being provided in order to ensure, by means of pressure, that the balls are blocked in rotation on their socket seats, these tensioning means also ensuring that the medical or surgical instrument is blocked in its support and being controlled from the distal end of a demountable distal segment of the arm.
However, such a device possesses a moderate rigidity in the blocking position and it has the disadvantage of necessitating a large number of balls, since the fact that the blocking cable passes through each of them considerably limits their angular clearance.
The document EP-A-0,415,417 discloses a retractor of the type including means, for attachment to an operating table or the like, which means are connected to means for supporting a medical or surgical instrument via an arm, in which at least one proximal segment of the arm consists of a succession of balls and cylindrical elements serving as socket seats for the balls and arranged alternatingly, means for axial compression of the arm being provided in order to ensure, by means of pressure, that the balls are blocked in rotation on their socket seats, the means for axial compression of the arm comprising means for supplying pressurized fluid to all the cylindrical elements each associated with a ball, and the means for releasing the axial compression of the arm including a manoeuvering member, situated at the distal end of the distal segment of the arm, that is to say in proximity to the support of the instrument holder.
An object of the invention is to make available a support device which ensures perfect immobilization of the instrument after positioning, including when the instrument is subjected to an external force. Another object is to allow the practitioner to adjust and block the device instantly, using only one hand.
Another object is to produce a device possessing all the degrees of freedom within the operating area.
Another object is to permit a dismantling of the support from the instrument in order to carry out sterilization thereof.
These various objects are achieved by means of a support device of the type disclosed by the document EP 0,415,417, and in which the arm includes a proximal rigid segment and a distal rigid segment, the proximal segment including only two balls, one at each
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patent: 4867404 (1989-09-01), Harrington et al.
patent: 5104103 (1992-04-01), Auchinleck et al.
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