Devices and methods for cervix measurement
A device for measuring a length of a cervix includes an elongate measurement member extending along a longitudinal axis and including a measurement scale thereon, a hollow member coaxial with and disposed over the elongate measurement member, a flange offset from the longitudinal axis and attached to a distal end of the hollow member, a handle attached to a proximal end of the measurement member, and a locking mechanism on the handle. The hollow member is freely rotatable about the longitudinal axis relative to the measurement member to place the flange in a first position and in a second position perpendicular to the first position without moving the measurement scale. The locking mechanism is configured, when locked, to fix the hollow member relative to the measurement member and, when unlocked, to allow the hollow member to slide axially along the measurement member in the first and second positions.
1. A device for measuring a length of a cervix, comprising:
an elongate measurement member extending along a longitudinal axis and including a measurement scale thereon;
a hollow member coaxial with and disposed over the elongate measurement member;
a flange offset from the longitudinal axis and attached to a distal end of the hollow member, the hollow member being freely rotatable about the longitudinal axis relative to the measurement member to place the flange in a first position and in a second position perpendicular to the first position without moving the measurement scale;
a handle attached to a proximal end of the measurement member; and
a locking mechanism on the handle configured, when locked, to fix the hollow member relative to the measurement member and, when unlocked, to allow the hollow member to slide axially along the measurement member in the first and second positions.
2. The device of claim 1 , wherein the locking mechanism includes a button, the button including a through-hole configured such that the hollow member can slide therethrough and a lock channel configured such that the hollow member cannot slide therethrough.
3. The device of claim 1 , wherein the hollow member is at least partially transparent.
4. The device of claim 1 , further comprising an indicator line on the hollow member.
5. The device of claim 4 , wherein the indicator line is configured to slide over the measurement scale to indicate a distance between a distal end of the elongate member and the flange.
6. The device of claim 1 , wherein the measurement scale includes an opaque background.
7. The device of claim 1 , wherein the flange has an opening through which the measurement member can advance distally.
8. The device of claim 1 , wherein the flange has a flat surface perpendicular to the longitudinal axis.
9. The device of claim 1 , wherein the flange is substantially conically shaped in a plane that is substantially perpendicular to the longitudinal axis.
10. The device of claim 1 , wherein the flange is attached to the distal end of the hollow member with an adhesive.
11. The device of claim 1 , wherein the measurement scale is a millimeter scale.
12. The device of claim 11 , wherein the scale extends from 0 mm to 50 mm.
13. The device of claim 12 , wherein the scale is marked in 5 mm increments.
14. The device of claim 1 , wherein the elongate member is configured to extend distally beyond the flange when the hollow member is moved axially.
15. The device of claim 1 , wherein the locking mechanism is further configured to fix the rotational position of the hollow member and flange relative to the elongate member.