Syringe pump

A syringe pump for administering an agent to a patient, the syringe pump comprising:

• a plunger head assembly;
• first and second flange-clamp jaws disposed on the plunger head assembly and configured to grasp onto a plunger flange of a plunger of a syringe, wherein the first and second flange-clamp jaws are configured to actuate between an open position and a closed position;
• a user-controlled actuator disposed on the plunger head assembly and configured for actuation by a user;
• a shaft disposed within the plunger head assembly and operatively coupled to the user-controlled actuator, the shaft being elongated along a length thereby defining an axis along the length, wherein actuation of the user-controller actuator rotates the shaft around the axis;
• and
• a sliding block assembly configured for engaging with a lead screw to move along the lead screw in accordance with rotation of the lead screw, wherein the sliding block assembly comprises:
• a half-nut housing having a lead screw void configured to receive the lead screw therewithin;
• a half nut disposed within the half-nut housing and 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 threads of the lead screw thereby creating slack and a disengagement position whereby the half nut threads are disengaged from the threads of the lead screw, wherein the half nut includes a cam follower surface and a half nut slot;
• and
• a barrel cam disposed within the half-nut housing and configured to engage with the 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.

A syringe pump for administering an agent to a patient, the syringe pump comprising:

• a plunger head assembly;
• first and second flange-clamp jaws disposed on the plunger head assembly and configured to grasp onto a plunger flange of a plunger of a syringe, wherein the first and second flange-clamp jaws are configured to actuate between an open position and a closed position;
• a shaft disposed within the plunger head assembly the shaft being elongated along a length thereby defining an axis along the length, wherein actuation of a user-controller actuator rotates the shaft around the axis;
• and
• a sliding block assembly configured for engaging with a lead screw to move along the lead screw in accordance with rotation of the lead screw, wherein the sliding block assembly comprises:
• a half-nut housing having a lead screw void configured to receive the lead screw therewithin;
• a half nut disposed within the half-nut housing and 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 threads of the lead screw thereby creating slack and a disengagement position whereby the half nut threads are disengaged from the threads of the lead screw, wherein the half nut includes a cam follower surface and a half nut slot;
• and
• a barrel cam disposed within the half-nut housing and configured to engage with the 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.

A syringe pump for administering an agent to a patient, the syringe pump comprising:

• a plunger head assembly;
• first and second flange-clamp jaws disposed on the plunger head assembly and configured to grasp onto a plunger flange of a plunger of a syringe, wherein the first and second flange-clamp jaws are configured to actuate between an open position and a closed position;
• a shaft being elongated along a length thereby defining an axis along the length;
• and
• a sliding block assembly configured for engaging with a lead screw to move along the lead screw in accordance with rotation of the lead screw, wherein the sliding block assembly comprises:
• a half-nut housing having a lead screw void configured to receive the lead screw therewithin;
• a half nut disposed within the half-nut housing and 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 threads of the lead screw thereby creating slack and a disengagement position whereby the half nut threads are disengaged from the threads of the lead screw, wherein the half nut includes a cam follower surface and a half nut slot;
• and
• a barrel cam disposed within the half-nut housing and configured to engage with the 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.