Intravascular blood parameter sensing system
First Claim
1. An assembly for the sensing of a blood parameter and for controlling the flow of blood from a blood vessel of a patient into and out of a lumen of a catheter, said assembly comprising:
- a sensing element for sensing a parameter of blood and providing a signal in response thereto;
a catheter having a proximal end, a distal end, and a lumen extending therethrough, said distal end being sized and adapted so as to be receivable within a blood vessel of a patient, said sensing element being located within said lumen; and
a volume oscillator in fluid communication with said lumen, said volume oscillator being configured so as to be capable of being connected to a flush solution source so as to allow for the flow of flush solution from said flush solution source, through said volume oscillator, and into said lumen, said volume oscillator comprising;
a housing defining a fluid flow path in fluid communication with said lumen and capable of being placed in fluid communication with said flush solution source;
a piston moveable relative to said housing and together with said housing defining a chamber of variable volume, said chamber being in fluid communication with said fluid flow path;
a stem secured to said piston and adapted to be activated to move said piston relative to said housing to thereby vary the volume of said chamber; and
means for activating said stem in a predetermined time sequence so that the volume of said chamber varies with time in accordance with a wave form.
1 Assignment
0 Petitions
Accused Products
Abstract
A parameter of blood is sensed in vivo with a system which includes a catheter and a probe. The catheter has a lumen extending therethrough, a proximal end, a distal end and a distal opening at the distal end. The probe includes one or more sensing elements at its distal end. In one embodiment, the sensing element or elements are located at least about 4 mm proximal of the distal opening of the lumen. A volume oscillator is provided to control the movement of blood into and out of the lumen. A flush solution is introduced into the lumen so that when the volume oscillator is inactive the sensing element or elements are exposed to pure flush solution, which preferably includes an anti-clotting component. The probe is received within the catheter and affixed thereto. The volume oscillator is activated to move blood into and out of the lumen to expose the sensing element or elements to blood so that they can sense the blood parameter or parameters of interest.
239 Citations
10 Claims
-
1. An assembly for the sensing of a blood parameter and for controlling the flow of blood from a blood vessel of a patient into and out of a lumen of a catheter, said assembly comprising:
-
a sensing element for sensing a parameter of blood and providing a signal in response thereto; a catheter having a proximal end, a distal end, and a lumen extending therethrough, said distal end being sized and adapted so as to be receivable within a blood vessel of a patient, said sensing element being located within said lumen; and a volume oscillator in fluid communication with said lumen, said volume oscillator being configured so as to be capable of being connected to a flush solution source so as to allow for the flow of flush solution from said flush solution source, through said volume oscillator, and into said lumen, said volume oscillator comprising; a housing defining a fluid flow path in fluid communication with said lumen and capable of being placed in fluid communication with said flush solution source; a piston moveable relative to said housing and together with said housing defining a chamber of variable volume, said chamber being in fluid communication with said fluid flow path; a stem secured to said piston and adapted to be activated to move said piston relative to said housing to thereby vary the volume of said chamber; and means for activating said stem in a predetermined time sequence so that the volume of said chamber varies with time in accordance with a wave form. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification