A clamp includes a clamp body having a spring arm with first and second ends and a deflection arm with first and second ends. The deflection arm is connected at its first end to the spring arm proximate the first end thereof, and the second end of the deflection arm is opposed spatially to a protrusion extending from the spring arm proximate the second end thereof. An actuating device engaged with the deflection arm and the protrusion can be manipulated to effect relative movement of the second end of the deflection arm away from the protrusion to cause a corresponding circumferential contraction of the spring arm. The actuating device includes a force-limiting mechanism, which limits the extent by which the second end of the deflection arm is moved away from the protrusion, thereby limiting the maximum circumferential contraction of the spring arm that can be achieved. A syringe pump assembly includes a syringe pump with a mechanized syringe and a clamp, as describe above, attached to the syringe to prevent vibration-induced rotation of the syringe.
1. A syringe pump assembly comprising:
a mechanized syringe including a barrel, a plunger disposed within said barrel for reciprocating movement therein, and a motor operatively coupled to said plunger for effecting mechanized movement of said plunger; and
an anti-rotation clamp secured to said syringe and constructed and arranged to prevent rotation of said syringe by contacting a structure adjacent to said syringe, said anti-rotation clamp comprising:
a clamp body comprising:
a spring arm extending generally in an arc having a first end and a second end;
a protrusion projecting from said spring arm proximate said second end thereof; and
a deflection arm connected at a first end thereof to said first end of said spring arm and having a second end disposed in spaced relation with respect to said protrusion, said deflection arm being constructed and arranged such that relative movement of said protrusion and said second end of said deflection arm away from each other effects a corresponding circumferential contraction of said spring arm and relative movement of said protrusion and said second end of said deflection arm toward each other effects a corresponding circumferential expansion of said spring arm; and
an actuating device engaged with said protrusion and said deflection arm and constructed and arranged to, upon manipulation thereof, effect relative movement of said protrusion and said second end of said deflection arm with respect to each other to thereby cause a corresponding circumferential contraction or expansion of said spring arm.
2. The syringe pump assembly of claim 1 , wherein said spring arm has an angular extent of about 270-300 degrees between said first and second ends thereof.
3. The syringe pump assembly of claim 1 , wherein said deflection arm includes a curved portion extending from said first end thereof to an intermediate position along said deflection arm and a straight portion extending from said intermediate position to said second end of said deflection arm.
4. The syringe pump assembly of claim 1 , wherein said clamp body comprises a single, integral piece of material.
5. The syringe pump assembly of claim 4 , wherein said material is selected from the group comprising: aluminum, nylon, and polypropylene.
6. The syringe pump assembly of claim 1 , wherein said actuating device comprises a threaded rod extending between and engaged with said deflection arm, proximate said second end thereof, and said protrusion.
7. The syringe pump assembly of claim 6 , wherein said threaded rod extends through a first hole formed through said deflection arm proximate said second end thereof.
8. The syringe pump assembly of claim 6 , wherein said threaded rod comprises a screw having a head with a threaded shaft extending therefrom and a tip at an opposite end of said threaded shaft from said head, and wherein said first hole is threaded so as to be cooperable with said threaded shaft of said screw, wherein said screw has a length such that when said screw is inserted through said first hole and said tip of said screw is engaged with said protrusion, said head of said screw is not in contact with said deflection arm, and wherein rotation of said screw causes said deflection arm to travel along said threaded shaft toward said head of said screw, while engagement of said screw tip with said protrusion prevents movement of said protrusion relative to said screw thereby effecting said relative movement of said second end of said deflection arm with respect to said protrusion.
9. The syringe pump assembly of claim 8 , further comprising a blind hole formed in said protrusion within which said tip of said screw is seated when said tip of said screw is engaged with said protrusion.
10. The syringe pump assembly of claim 1 , wherein said actuating device includes a load limitation feature constructed and arranged to prevent the relative movement of said second end of said deflection arm away from said protrusion from exceeding a predetermined amount to thereby limit the amount of corresponding circumferential contraction.
11. The syringe pump assembly of claim 8 , wherein said actuating device includes a load limitation feature constructed and arranged to prevent the relative movement of said second end of said deflection arm away from said protrusion from exceeding a predetermined amount to thereby limit the amount of corresponding circumferential contraction, said load limitation feature comprising the head of said screw which is constructed and arranged to contact said deflection arm to limit the distance by which said deflection arm can advance along said threaded shaft during rotation of said screw.