ENDOSCOPIC MEDICAL DEVICE WITH LOCKING MECHANISM AND METHOD
An endoscopic system having an endoscope carrying an endoscopic medical device that can be an auxiliary rear-ward facing camera or medical tool for cutting, ablation, cutting, suturing, retracting, manipulating, suction, or irrigation. A locking assembly allows the user of the system to lock the rotational orientation of a distal portion of endoscopic medical device within a distal end of the endoscope. The locking assembly has a locking device attached to the distal portion of the endoscopic medical device and a cap that is permanently or removably attached to the distal end of the endoscope. When desired, the user of the system engages the locking device and the cap together to prevent rotation. The locking device can include one more flexible members that can contract when pushed through a working channel of the endoscope and expand to engage mating features on the cap. Magnets can also be used to prevent rotation.
1 . An endoscopic medical device comprising:
a tubular body comprising a central longitudinal axis;
an inner locking device attached to the tubular body and comprising an inner locking member that is radially movable relative to the tubular body; and
an outer locking device having an opening sized to allow the tubular body to pass through the outer locking device, the outer locking device comprising an outer locking member sized to engage the inner locking member such that the tubular body is prevented from rotating about the longitudinal axis relative to the outer locking device.
2 . The endoscopic medical device of claim 1 , further comprising an imaging device, a light source, and a polarizing filter at a distal end of the tubular body, wherein the polarizing filter is disposed over either one or both of the imaging device and the light source.
3 . The endoscopic medical device of claim 1 , wherein the outer locking device comprises a side wall extending longitudinally, a slot formed through the side wall, and an end wall attached to the side wall at an angle, wherein the side wall extends proximally from the end wall and the opening of the outer locking device is formed through the end wall.
4 . The endoscopic medical device of claim 3 , wherein:
the end wall has a hole for an imaging device and a hole for a light source; and
the outer locking device further comprises a polarizing filter disposed over either one or both of the hole for an imaging device and the hole for a light source.
5 . The endoscopic medical device of claim 1 , wherein:
the outer locking device comprises a cylindrical wall extending longitudinally; and
the cylindrical wall is concentric with the opening.
6 . The endoscopic medical device of claim 5 , wherein the outer locking device comprises at least one rib disposed on an inner surface of the cylindrical wall.
7 . The endoscopic medical device of claim 5 , wherein the cylindrical wall has at least one notch formed on an inner surface of the cylindrical wall.
8 . The endoscopic medical device of claim 1 , wherein:
the inner locking member includes a flexible flap comprising a first end attached to the tubular body and a second end that is radially movable relative to the tubular body; and
the outer locking member is sized to engage the second end of the flap.
9 . The endoscopic medical device of claim 1 , wherein:
the inner locking member is a wire spring comprising a medial portion and at least one end attached to the tubular body, the medial portion being radially movable relative to the tubular body; and
the outer locking member is sized to engage the medial portion of the wire spring.
10 . The endoscopic medical device of claim 9 , wherein the medial portion of the wire spring and the outer locking member are longitudinally oriented.
11 . The endoscopic medical device of claim 9 , wherein the medial portion of the wire spring is disposed further away from the longitudinal axis than the rest of the wire spring.
12 . The endoscopic medical device of claim 9 , wherein:
the inner locking device further comprises a second wire spring comprising a medial portion and at least one end attached to the tubular body, the medial portion of the second wire spring being radially movable relative to the tubular body; and
the outer locking device further comprises a second inner locking member that is sized to engage the medial portion of the second wire spring.
13 . The endoscopic medical device of claim 9 , further comprising a position indicator attached to the tubular body, the position indicator being longitudinally aligned with the inner locking member.
14 . The endoscopic medical device of claim 13 , wherein the position indicator comprises a distal portion, a proximal portion, and at least one end attached to the tubular body, the distal portion oriented at a first acute angle relative to the longitudinal axis, the proximal portion oriented at a second acute angle relative to the longitudinal axis.
15 . The endoscopic medical device of claim 14 , wherein the first acute angle is less than the second acute angle.
16 . The endoscopic medical device of claim 9 , wherein:
the medial portion of the wire spring comprises a curved segment that has a peak disposed further away from the longitudinal axis than the rest of the wire spring; and
the outer locking member is sized to engage the peak.
17 . The endoscopic medical device of claim 9 , wherein:
the medial portion of the wire spring comprises a distal segment oriented at a first acute angle to the longitudinal axis, a proximal segment oriented at a second acute angle to the longitudinal axis, and an intermediate segment disposed between the distal segment and the proximal segment; and
the outer locking member is sized to engage the intermediate segment.
18 . The endoscopic medical device of claim 1 , wherein:
the inner locking member is a leaf spring comprising at least one end attached to the tubular body, the leaf spring being radially movable relative to the tubular body.
19 . The endoscopic medical device of claim 18 , wherein:
the leaf spring comprises a distal portion oriented at a first angle to the longitudinal axis, a proximal portion oriented at a second angle to the longitudinal axis, and an intermediate section oriented longitudinally and disposed between the distal portion and the proximal portion; and
the outer locking member is longitudinally oriented to engage the intermediate section.
20 . The endoscopic medical device of claim 18 , wherein the inner locking device further comprises a second leaf spring comprising at least one end attached to the tubular body, the second leaf spring being radially movable relative to the tubular body; and
the outer locking device further comprises a second outer locking member that is sized to engage the second leaf spring.
21 . The endoscopic medical device of claim 1 , wherein:
the inner locking member is a torsion spring disposed circumferentially around a portion of the tubular body, the torsion spring comprising a first portion attached to the tubular body, a second portion that is radially movable relative to the tubular body, and a locking element on the second portion; and
the outer locking member is sized to engage the locking element.
22 . The endoscopic medical device of claim 21 , wherein:
the torsion spring is formed from a sheet material that bends around the tubular body; and
the locking element is a rib on the movable portion of the torsion spring.
23 . The endoscopic medical device of claim 21 , wherein:
the torsion spring is formed from a wire that bends around the tubular body, the wire comprising a locking segment; and
the locking element is the locking segment of the wire.
24 . The endoscopic medical device of claim 23 , wherein:
the wire of the inner locking device further comprises a second locking segment; and
the outer locking device comprises a second outer locking member sized to engage the second locking segment of the wire.
25 . The endoscopic medical device of claim 21 , wherein:
the inner locking device includes a plurality of torsion springs formed from separate wires, each wire bent around the tubular body and comprising a locking segment; and
the outer locking device includes a plurality of outer locking members, each of the outer locking members sized to engage at least one of the locking segments.
26 . An endoscopic system comprising:
an endoscope having a longitudinal channel;
an endoscopic medical device including a tubular body, wherein the endoscopic medical device is disposed in the longitudinal channel; and
a locking assembly that interlocks the endoscope and the endoscopic medical device to prevent relative rotational movement between the endoscope and the endoscopic medical device.
27 . The system of claim 26 , wherein the locking assembly includes a locking device attached to the tubular body and a cap attached to the endoscope, wherein the cap is selectively engaged with the locking device.
28 . The system of claim 27 , wherein:
the cap comprises a side wall and an end wall attached to the side wall at an angle; and
an opening is formed through the end wall and is sized to allow the tubular body to pass through the cap.
29 . The system of claim 28 , wherein:
the end wall has a hole for an imaging device and a hole for a light source; and
the outer locking device further comprises a polarizing filter disposed over either one or both of the hole for an imaging device and the hole for a light source.
30 . The system of claim 28 , wherein:
the cap comprises a cylindrical wall extending from the end wall; and
the opening of the outer locking device is formed through the end wall; and
the cylindrical wall is concentric with the opening.
31 . The system of claim 30 , wherein the outer locking device comprises at least one rib disposed on an inner surface of the cylindrical wall.
32 . The system of claim 30 , wherein the cylindrical wall has at least one notch formed into an inner surface of the cylindrical wall.
33 . The system of claim 27 , wherein:
the locking device comprises a flexible flap having a first end attached to the tubular body and a second end that is radially movable relative to the tubular body; and
the cap comprises engages the second end of the flap to prevent the tubular body from rotating relative to the cap.
34 . The system of claim 27 , wherein:
the locking device comprises a wire spring comprising a medial portion and at least one end attached to the tubular body, the medial portion being radially movable relative to the tubular body; and
the cap selectively engages the medial portion of the wire spring to prevent the tubular body from rotating relative to the cap.
35 . The system of claim 34 , wherein the medial portion of the wire spring is longitudinally oriented.
36 . The system of claim 34 , wherein the medial portion of the wire spring is disposed further away from a central longitudinal axis of the tubular body than the rest of the wire spring.
37 . The system of claim 34 , wherein:
the locking device further comprises a second wire spring comprising a medial portion and at least one end attached to the tubular body, the medial portion of the second wire spring being radially movable relative to the tubular body; and
the cap selectively engages the medial portion of the second wire spring to prevent the tubular body from rotating relative to the cap.
38 . The system of claim 34 , further comprising position indicator attached to the tubular body, the position indicator being longitudinally aligned with the locking device.
39 . The system of claim 38 , wherein the position indicator comprises a distal portion, a proximal portion, and at least one end attached to the tubular body, the distal portion oriented at a first acute angle relative to the longitudinal axis, the proximal portion oriented at a second acute angle relative to the longitudinal axis.
40 . The system of claim 39 , wherein the first acute angle is less than the second acute angle.
41 . The system of claim 34 , wherein:
the medial portion of the wire spring comprises a curved segment that has a peak disposed further away from the central longitudinal axis of the tubular body than the rest of the wire spring; and
the cap selectively engages the peak to prevent the tubular body from rotating relative to the cap.
42 . The system of claim 34 , wherein:
the medial portion of the wire spring comprises a distal segment oriented at a first acute angle to the longitudinal axis, a proximal segment oriented at a second acute angle to the longitudinal axis, and an intermediate segment disposed between the distal segment and the proximal segment; and
the cap selectively engages the intermediate segment to prevent the tubular body from rotating relative to the cap.
43 . The system of claim 27 , wherein:
the locking device comprises a leaf spring comprising at least one end attached to the tubular body, the leaf spring being radially movable relative to the tubular body; and
the cap selectively engages the leaf spring to prevent the tubular body from rotating relative to the cap.
44 . The system of claim 43 , wherein:
the leaf spring comprises a distal portion oriented at a first angle to the longitudinal axis, a proximal portion oriented at a second angle to the longitudinal axis, and an intermediate section oriented longitudinally and disposed between the distal portion and the proximal portion; and
the cap selectively engages the intermediate section to prevent the tubular body from rotating relative to the cap.
45 . The system of claim 43 , wherein the locking device further comprises a second leaf spring comprising at least one end attached to the tubular body, the second leaf spring being radially movable relative to the tubular body; and
the cap selectively engages the second leaf spring to prevent the tubular body from rotating relative to the cap.
46 . The system of claim 27 , wherein:
the locking device comprises a torsion spring disposed circumferentially around a portion of the tubular body, the torsion spring comprising a first portion attached to the tubular body, a second portion that is radially movable relative to the tubular body, and a locking element on the movable portion; and
the cap selectively engages the locking element to prevent the tubular body from rotating relative to the cap.
47 . The system of claim 46 , wherein:
the torsion spring is formed from a sheet material that bends around the tubular body; and
the locking element is a rib on the movable portion of the torsion spring.
48 . The system of claim 46 , wherein:
the torsion spring is formed from a wire that bends around the tubular body, the wire comprising a locking segment; and
the locking element is the locking segment of the wire.
49 . The system of claim 48 , wherein:
the wire of the locking device further comprises a second locking segment; and
the cap engages the second locking segment to prevent the tubular body from rotating relative to the cap.
50 . The system of claim 46 , wherein:
the locking device includes a plurality of torsion springs formed from separate wires, each wire bent around the tubular body and comprising a locking segment; and
the cap engages the at least one of the locking segments to prevent the tubular body from rotating relative to the cap.
51 . A method of configuring an endoscopic system, comprising:
inserting a tubular body of an endoscopic medical device into a channel of an endoscope, wherein an inner locking device is attached to the tubular body, and wherein when the tubular body is inside the channel the inner surface of the channel radially compresses the inner locking device;
continuing to insert the tubular body of the endoscopic medical device until the inner locking device comes out of the channel, wherein the inner locking device extends radially outwards to engage an outer locking device attached to the endoscope, and wherein the engagement prevents the tubular body from rotating relative to the endoscope.