Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
287 words
A surgical appliance capable of being temporarily placed in a body for assisting in the passage of a tube through a puncture formed in the skin of the body, contraction of the skin around the tube, once the appliance is removed, assisting in holding the tube in place, said surgical appliance comprising: a trochar having a proximal end, a distal end and being divided into a plurality of separate components; at least one tooth on the proximal end of each of said components; a rotary actuator for said plurality of trochar components, said actuator having a central channel therethrough, a spiral formation on said actuator cooperating with said teeth on said trochar components so that rotation of said actuator about the longitudinal axis of said trochar produces parallel radial motion of each of said trochar components having at least one tooth thereon with respect to each other from a closed position in which such components lie substantially parallel and adjacent to each other thereby to form a composite trochar to an open position wherein such components are substantially axially parallel with each other and separated radially to create a trochar central channel through said trochar components, said trochar central channel formed within said trochar components forming a continuation of said first named central channel through said actuator to provide channel means within said appliance through which a tube can be positioned with one end thereof extending into the puncture, and said appliance being capable of being removed from around the tube to leave only the tube in place within the puncture formed in the skin, contraction of the skin adjacent the puncture around the tube upon removal of said appliance assisting in holding the tube in place.
Claim 2
Dependent Claim
287 words
A surgical appliance capable of being temporarily placed in a body for assisting in the passage of a tube through a puncture formed in the skin of the body, contraction of the skin around the tube, once the appliance is removed, assisting in holding the tube in place, said surgical appliance comprising: a trochar having a proximal end, a distal end and being divided into a plurality of separate components; at least one tooth on the proximal end of each of said components; a rotary actuator for said plurality of trochar components, said actuator having a central channel therethrough, a spiral formation on said actuator cooperating with said teeth on said trochar components so that rotation of said actuator about the longitudinal axis of said trochar produces parallel radial motion of each of said trochar components having at least one tooth thereon with respect to each other from a closed position in which such components lie substantially parallel and adjacent to each other thereby to form a composite trochar to an open position wherein such components are substantially axially parallel with each other and separated radially to create a trochar central channel through said trochar components, said trochar central channel formed within said trochar components forming a continuation of said first named central channel through said actuator to provide channel means within said appliance through which a tube can be positioned with one end thereof extending into the puncture, and said appliance being capable of being removed from around the tube to leave only the tube in place within the puncture formed in the skin, contraction of the skin adjacent the puncture around the tube upon removal of said appliance assisting in holding the tube in place.
Claim 3
Dependent Claim
20 words
A surgical appliance according to claim 1, wherein the trochar formed by said trochar components has a sharp distal end.
Claim 4
Dependent Claim
51 words
A surgical appliance according to claim 1 wherein there is a central opening through said actuator which, when said trochar components are opened, is in continuation of the central channel through those components, whereby it is possible to pass a tube through the entire appliance when the trochar components are open.
Claim 5
Dependent Claim
72 words
A surgical appliance according to claim 3, wherein there is an annular tube seal adapted to seal between the appliance and a tube passed through it, and an annular front seal adapted to seal between the appliance and the skin of the patient when the appliance is being used, said two seals together providing at least a restriction on the access of air to the site where the trochar penetrates the skin.
Claim 6
Dependent Claim
134 words
A surgical appliance according to claim 1 including a body, and a handle attached to said body, said at least one tooth on each said trochar component being provided on a block extending radially from the proximal end of that component, each of said blocks being received in a radial slot in said body, each said block further having interengagement with at least one shoulder in said slot to prevent axial displacement of said block, and therefore the component on which said block is provided, relatively to said body; said body having a shoulder and said handle having a shoulder facing said shoulder on said body; and said rotary actuator being journalled on said body and being located axially thereon by said shoulder on said body and said oppositely facing shoulder on said handle.
Claim 7
Dependent Claim
20 words
A surgical appliance according to claim 1 wherein the distal end of said trochar has at least one cutting edge.
Claim 8
Dependent Claim
48 words
A surgical appliance according to claim 1, wherein there are three trochar components arranged to move on radial paths spaced at 120° around the trochar longitudinal axis, and one component terminates at the distal end, short of the other two components, leaving cutting edges on those two components.