Syringe pump and related method
First Claim
1. A syringe pump, comprising:
- a lead screw having threads;
a motor operatively coupled to the lead screw to rotate the lead screw; and
a sliding block assembly comprising;
a half-nut housing having a lead screw void configured to receive the lead screw;
a half nut disposed within the half-nut housing, the half nut having half-nut threads at an end adjacent to the lead screw void, the half nut is slideable between an engagement position whereby the half-nut threads engage with the threads of the lead screw and a disengagement position whereby the half-nut threads are disengaged from the threads of the lead screw, wherein the half nut includes a half-nut cam-follower surface and a half nut slot; and
a barrel cam disposed within the half-nut housing and configured to engage with the half-nut cam-follower surface, the barrel cam includes a pin configured to fit within the half nut slot, wherein the barrel cam is configured to rotate between a first position and a second position to actuate the half nut between the engagement position and the disengagement position, respectively.
1 Assignment
0 Petitions
Accused Products
Abstract
A syringe pump includes a lead screw, a motor, and a sliding block assembly. The lead screw has threads and the motor is coupled to the lead screw to rotate it. The half-nut housing has a half nut and a barrel cam. The half nut is disposed within the half-nut housing. The half nut has half-nut threads at an end adjacent to the lead screw void. The half nut engages or disengages with the threads of the lead screw. The half nut includes a half-nut cam-follower surface and a half nut slot. The barrel cam is disposed within the half-nut housing and engages with the half-nut cam-follower surface. The barrel cam includes a pin to fit within the half nut slot such that the barrel cam rotates between a first position and a second position to actuate the half nut between the engagement position and the disengagement position, respectively.
329 Citations
30 Claims
-
1. A syringe pump, comprising:
-
a lead screw having threads; a motor operatively coupled to the lead screw to rotate the lead screw; and a sliding block assembly comprising; a half-nut housing having a lead screw void configured to receive the lead screw; a half nut disposed within the half-nut housing, the half nut having half-nut threads at an end adjacent to the lead screw void, the half nut is slideable between an engagement position whereby the half-nut threads engage with the threads of the lead screw and a disengagement position whereby the half-nut threads are disengaged from the threads of the lead screw, wherein the half nut includes a half-nut cam-follower surface and a half nut slot; and a barrel cam disposed within the half-nut housing and configured to engage with the half-nut cam-follower surface, the barrel cam includes a pin configured to fit within the half nut slot, wherein the barrel cam is configured to rotate between a first position and a second position to actuate the half nut between the engagement position and the disengagement position, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
-
-
29. A method of engaging a lead screw of a syringe pump, comprising:
-
actuating a barrel cam between a disengaged position to an engaged position; engaging the barrel cam with a half-nut cam-follower surface of a half-nut; engaging a pin of the barrel cam with a half nut slot of the half-nut; and engaging half-nut threads with threads of the lead screw. - View Dependent Claims (30)
-
Specification