Surgical access device with pendent valve
View Patent ↗A surgical access device, such as a trocar, includes a pendent valve having an elongate structure extending from a proximal end to a septum valve disposed at a distal end. In operation, the elongate structure follows the angle of the instrument to pre-position the septum valve into the path of the instrument where it is not significantly challenged during instrument insertion or manipulation. The pendant valve can be made to float at both the proximal end and the distal end of the elongate structure, to further reduce the vulnerability of the septum valve. Since the valve is less vulnerable to instrument insertion, it can be formed to minimize friction and maximize the functional range of the access device.
1. A surgical device having an axis extending between a proximal end and a distal end, and having a working channel adapted to receive a surgical instrument, comprising:
a valve housing disposed along the working channel;
a valve assembly disposed in the valve housing and adapted to form an instrument seal with the surgical instrument when the surgical instrument is disposed in the working channel;
a first tube having an elongate configuration, a proximal end, and a distal end, the first tube defining at least a portion of the working channel in the valve assembly;
a flexible connector disposed between the valve housing and the tube, and facilitating pendulous movement of the tube;
a septum valve carried by the first tube and having properties for forming the instrument seal;
a second elongate tube coaxial with the first tube;
a duckbill valve disposed at a distal end of the second tube;
a connection feature coupling the first tube and the second tube; and
a flexible connector coupling an end cap of the valve housing to the first and second tubes, and facilitating pendulous movement of the first and second tubes,
wherein the septum valve is disposed at a first distance from the flexible connector, the first distance defining a first lever arm that facilitates movement of the first tube and the septum valve in response to movement of the surgical instrument within the working channel.
2. The surgical device recited in claim 1 , wherein the first tube has a diameter and the first lever arm has a length greater than the diameter of the first tube.
3. The surgical device recited in claim 1 , wherein:
the first tube has a distal end and a proximal end; and
the flexible connector forms a housing seal generally between the proximal end of the first tube and the valve housing.
4. The surgical device recited in claim 3 , wherein the septum valve is disposed generally at the distal end of the first tube.
5. The surgical device recited in claim 1 , wherein the flexible connector floats the proximal end of the first tube relative to the valve housing.
6. The surgical device recited in claim 1 , wherein the distal end of the first tube is generally pivotal about the flexible connector and generally free to swing relative to the valve housing.
7. The surgical device recited in claim 1 , wherein the first tube has a diameter and an axial length greater than the diameter.
8. The surgical device recited in claim 1 , wherein the flexible connector comprises a bellows.
9. A surgical device having an axis extending between a proximal end and a distal end, and having a working channel adapted to receive a surgical instrument, comprising:
a valve housing disposed along the working channel;
a valve disposed in the valve housing along the working channel, the valve being adapted to form an instrument seal with the instrument when the instrument is present in the working channel, wherein the valve has a preferred orientation relative to the instrument which facilitates formation of the instrument seal;
a support comprising a first tube comprising a proximal end and a distal end, wherein;
the proximal end of the first tube is coupled to the valve housing and the distal end of the first tube is coupled to the valve; and
the support has properties for following the instrument during insertion of the instrument and for moving the valve toward the preferred orientation prior to engagement of the valve by the instrument;
a second tube coaxial with and coupled to the first tube; and
a duckbill valve coupled to a distal end of the second tube.
10. The surgical device recited in claim 9 , wherein the first tube has a length, and a diameter less than the length.
11. The surgical device recited in claim 9 , wherein the valve comprises a septum valve.
12. The surgical device recited in claim 9 , wherein the support includes a bellows.
13. The surgical device in claim 9 , wherein at least a portion of the support is moveable relative to the housing.
14. The surgical device recited in claim 13 , wherein the support has a pivotal relationship with the housing.