Medical devices and methods

1. A sheath for use with a medical device, the sheath comprising:

a C-shaped elongate shaft having a circularly shaped cross-section with a gap having a gap width, the gap extending along an entire length of the sheath from a proximalmost extent of the sheath to a distalmost extent of the sheath, the C-shaped elongate shaft configured to fit onto a shaft of the medical device;

a first lumen extending at least partially along a length of the C-shaped elongate shaft, the first lumen having a first port disposed proximate the distal end of the C-shaped elongate shaft and a second port disposed proximate the proximal end of the C-shaped elongate shaft;

a second lumen extending at least partially along the length of the C-shaped elongate shaft, the second lumen having a first port disposed proximate the distal end of the C-shaped elongate shaft and a second port disposed proximate the proximal end of the C-shaped elongate shaft;

wherein the second port of the second lumen is the second port of the first lumen;

a connecting member disposed at the second port; and

a pressure sensor connected to the connecting member to seal off the first and second lumens thereby forming static fluid columns within the first and second lumens in fluid communication with the pressure sensor.

2. The sheath of claim 1 , wherein the first port of the first lumen is disposed on a distal-facing surface of the C-shaped elongate shaft.

3. The sheath of claim 1 , wherein the first port of the first lumen is disposed on a side of the C-shaped elongate shaft.

4. The sheath of claim 1 , wherein the C-shaped elongate shaft is configured to securely snap onto the shaft of the medical device.

5. The sheath of claim 1 , wherein the circularly shaped cross-section defines a channel having a channel diameter, and wherein the gap width is less than the channel diameter.

6. The sheath of claim 1 , wherein the C-shaped elongate shaft is configured to flex in order to fit onto the shaft of the medical device by passing the shaft laterally through the gap.

7. The sheath of claim 1 , wherein the medical device comprises an endoscope.

8. The sheath of claim 1 , wherein the first port of the second lumen is disposed on a distal-facing surface of the C-shaped elongate shaft.

9. The sheath of claim 1 , wherein the first port of the second lumen is disposed on a side of the C-shaped elongate shaft.

10. A medical device sheath comprising:

an elongate shaft having a length extending from a proximal end to a distal end, a wall of the elongate shaft defining a channel with a longitudinally extending opening extending through the wall such that the elongate shaft only partially surrounds the channel, the longitudinally extending opening extending from a proximalmost extent of the sheath to a distalmost extent of the sheath, the channel configured to receive a shaft of a medical device laterally therein;

a first lumen extending at least partially along the length of the elongate shaft within the wall of the elongate shaft, a second lumen extending at least partially along the length of the elongate shaft within the wall of the elongate shaft, and a third lumen extending at least partially along the length of the elongate shaft within the wall of the elongate shaft;

wherein the first lumen, the second lumen, and the third lumen merge at some point within the elongate shaft and connect with a proximal port disposed proximate the proximal end of the elongate shaft;

wherein the first lumen includes a first distal port disposed proximate the distal end of the elongate shaft, the second lumen includes a second distal port disposed proximate the distal end of the elongate shaft, and the third lumen includes a third distal port disposed proximate the distal end of the elongate shaft;

wherein the first distal port, the second distal port, and the third distal port form a spiraling pattern around the elongate shaft;

wherein the medical device is laterally received into the channel through the longitudinally extending opening in the wall of the elongate shaft; and

a pressure sensor connected to the proximal port to seal off the first, second, and third lumens thereby forming static fluid columns within the first, second, and third lumens in fluid communication with the pressure sensor.

11. The medical device sheath of claim 10 , further comprising a connection member disposed at the proximal end of the elongate shaft, the connection member configured to connect to the medical device.

12. The medical device sheath of claim 10 , wherein the medical device is an endoscope or a hysteroscope.

13. The medical device sheath of claim 10 , wherein the channel has a channel diameter, and wherein the channel diameter is less than or equal to a diameter of the shaft of the medical device.

14. The medical device sheath of claim 10 ,

wherein a width of the opening is smaller than a diameter of the shaft of the medical device, and

wherein the wall of the elongate shaft is configured to flex to receive the shaft of the medical device through the longitudinally extending opening of the channel within the channel.