Sheath device for inserting a catheter

1. A sheath device for inserting a catheter in a patient's body, comprising:

a first sheath having a proximal end and a distal end, wherein the distal end of the first sheath is configured to be inserted in the patient's body and the proximal end of the first sheath is configured to remain outside the patient's body, and wherein the first sheath comprises:

a tubular section; and

a sheath housing, the sheath housing disposed at the proximal end of the tubular section and comprising a clamping element and a receiving channel for a catheter;

wherein the tubular section is detachably held in the clamping element of the sheath housing in a non-positive manner, and wherein the clamping element comprises a hemostatic valve.

2. The sheath device according to claim 1 , wherein the tubular section can be displaced into the sheath housing when the clamping element is released.

3. The sheath device according to claim 2 , wherein the tubular section leads into the sheath housing in direct extension of the receiving channel.

4. The sheath device according to claim 3 , wherein the clamping element comprises an elastically deformable clamping ring, which surrounds the tubular section and can be pressed by a manipulating element such that the ring radially clamps the tubular section.

5. The sheath device according to claim 4 , wherein the clamping ring can be radially deformed by axial pressure action.

6. The sheath device according to claim 5 , wherein the clamping ring is produced from an elastomer or from a slotted ring made of plastic material or metal.

7. The sheath device according to claim 4 , wherein the clamping element comprises a screw element for axially pressing a clamping ring.

8. The sheath device according to claim 1 , wherein the tubular section has at least one predetermined breaking point at least at the proximal end, the predetermined breaking point being used to sever a longitudinal section of the tubular section.

9. The sheath device according to claim 1 , wherein the sheath housing comprises a cutting element which can be used on a portion of the tubular section which can be severed, or perforated, notched or scored for the purpose of easier severing.

10. The sheath device according to claim 9 , wherein the cutting element comprises at least one blade, which is movably guided in the sheath housing, and radially toward the catheter.

11. The sheath device according to claim 1 , wherein the sheath housing comprises a further clamping element on the proximal side of the clamping element, wherein the further clamping element is provided so as to radially clamp the catheter or to radially clamp a second sheath surrounding the catheter and/or a functional element connected to the catheter.

12. The sheath device according to claim 1 , wherein the hemostatic valve is configured to seal around the tubular section.

13. A method for inserting a catheter having a functional element disposed at the end thereof into a patient's body, comprising:

inserting a sheath into a patient's body, wherein the sheath comprises a tubular section and a sheath housing at a proximal end of the tubular section located outside a patient's body, and wherein the tubular section is detachably held in a clamping element comprising a hemostatic valve;

inserting a catheter into the tubular section;

advancing the catheter within the tubular section into the patient's body;

pulling the tubular section a certain distance out of the patient's body in the proximal direction; and

releasing the clamping element and moving the tubular section into the sheath housing.

14. The method according to claim 13 , further comprising:

shortening the tubular section by:

releasing the clamping element;

pulling the tubular section in a proximal direction through the sheath housing; and

re-clamping the tubular section in the clamping element.

15. The method according to claim 14 , wherein shortening the tubular section is further accomplished by:

is tearing open a first portion of the tubular section in a longitudinal direction, wherein a second portion of the tubular section is untorn; and

tearing the first portion of the tubular section from the second portion.