Reduced vibration vitrectomy probe
A vitrectomy probe with combined vibration dampening and attenuating. The probe may include a variety of features to lessen the vibrations felt by a surgeon during a vitrectomy procedure. These may include minimizing the degree of flow restriction through a housing that facilitates cutter reciprocation by way of air pressure. Further, utilizing softer stops at a diaphragm that drives the cutter reciprocation may be of benefit as is strategically lessening compressive forces by seals at an extension tube coupled to the diaphragm where possible. The use of a softer gripping component that is actually held by the surgeon may be of benefit in terms of vibration attenuation.
1 . A vitrectomy probe comprising:
a forward housing component;
a rearward housing component;
a diaphragm located in a space between and defined by the forward housing component and the rearward housing component for reciprocating therebetween in response to air flows alternatingly directed at opposite sides of the diaphragm;
a plurality of discrete stops for striking the forward housing component and the rearward housing component during the reciprocating, the striking resulting in vibrations, at least a subset of the plurality of discrete stops comprising a material that is less than about 60 Shore A in hardness to dampen the vibrations;
a cutter coupling to the diaphragm and located within a needle of the vitrectomy probe to cut vitreous humor during a vitrectomy procedure performed by a surgeon;
a gripping component with the needle emerging therefrom, the gripping component coupled to the forward housing component and for manual holding by the surgeon during the vitrectomy procedure, the gripping component comprising an elastomer that is less than about 60 Shore A in hardness to attenuate the vibrations; and
a shell coupled to the rearward housing component,
wherein the forward housing component and the rearward housing component are disposed between the shell and the gripping component and form at least a portion of an exterior surface of the vitrectomy probe.
2 . The vitrectomy probe of claim 1 , wherein the gripping component is less than about 0.5 inches in outer diameter.
3 . The vitrectomy probe of claim 1 , wherein the plurality of discrete stops are comprised of silicone rubber.
4 . The vitrectomy probe of claim 1 , further comprising an extension tube to facilitate the coupling of the cutter to the diaphragm, the extension tube configured to reciprocate with the diaphragm and the cutter during the vitrectomy in response to the air flows.
5 . The vitrectomy probe of claim 4 , further comprising static seals mounted in the forward housing component and the rearward housing component about the extension tube for sealing off the air flows.
6 . The vitrectomy probe of claim 5 , wherein the static seals that do not seal off an air flow directing the diaphragm away from the forward housing component present less compressive force on the extension tube than any seal that does seal off the air flow directing the diaphragm away from the forward housing component.
7 . The vitrectomy probe of claim 5 , wherein the static seals are coated with one of a parylene polymer and polytetrafluoroethylene.
8 . The vitrectomy probe of claim 5 , wherein the extension tube is electro-polished.
9 . The vitrectomy probe of claim 5 , further comprising silicone lubricant at interfaces between the extension tube and the static seals.
10 . The vitrectomy probe of claim 1 , wherein the rearward housing component accommodates a first air flow therethrough for directing a diaphragm to travel toward a needle of a vitrectomy probe.
11 . The vitrectomy probe of claim 1 , wherein the forward housing component accommodates a second air flow therethrough for directing the diaphragm to travel away from the needle of the probe, the rearward housing having a stepped channel to accommodate the second air flow therethrough in advance of reaching the forward housing.
12 . The vitrectomy probe of claim 11 , wherein the stepped channel is at a chamber of the rearward housing with a volume of at least about 0.00275 in 3 .
13 . The vitrectomy probe of claim 1 , wherein an outlet at a most distal portion of the rearward housing has a longitudinal axis that is parallel to an axis of the most proximal portion of an airflow path through the rearward housing.
14 . The vitrectomy probe of claim 1 , wherein the rearward housing is uniform channel free to minimize flow restriction of the air flows therethrough.
15 . A method of performing a vitrectomy, the method comprising:
inserting a needle of a vitrectomy probe into an eye of a patient with a hand of a surgeon, wherein the vitrectomy probe comprises:
a forward housing component;
a rearward housing component;
a gripping component with the needle emerging therefrom, the gripping component coupled to the forward housing component; and
a shell coupled to the rearward housing component,
wherein the forward housing component and the rearward housing component are disposed between the shell and the gripping component and form at least a portion of an exterior surface of the vitrectomy probe; and
withdrawing vitreous humor from the eye through a port of the needle;
reciprocating a cutter within the needle to cut the vitreous humor as it enters the needle;
dampening a degree of produced vibrations due to the reciprocating of the cutter; and
attenuating an amount of produced vibrations reaching the surgeon's hand.
16 . The method of claim 15 , wherein the dampening of the produced vibrations comprises utilizing a stepped channel to minimize flow restriction in a housing accommodating reciprocating components for the cutter.
17 . The method of claim 16 , wherein the dampening of the produced vibrations comprises utilizing discrete silicone stops at a diaphragm driving the reciprocating, the discrete silicone stops striking a structure of the housing during the reciprocating.
18 . The method of claim 17 , wherein the dampening of the degree of produced vibrations comprises using seals at an extension tube coupling the diaphragm to the cutter wherein compressive force on the extension tube is less for any seal not sealing off an air flow directing a return stroke of the diaphragm away from the eye of the patient than for any seal sealing off the air flow directing the return stroke of the diaphragm away from the eye of the patient.
19 . The method of claim 15 , wherein the attenuating of the amount of produced vibrations is achieved through a gripping component of the vitrectomy probe in the hand of the surgeon during the vitrectomy, the gripping component comprised of an elastomer that is less than about 60 Shore A in hardness.
20 . The method of claim 15 ,
wherein the rearward housing component accommodates a first air flow therethrough for directing a diaphragm to travel toward a needle of a vitrectomy probe; and
wherein the forward housing component accommodates a second air flow therethrough for directing the diaphragm to travel away from the needle of the probe, the rearward housing having a stepped channel to accommodate the second air flow therethrough in advance of reaching the forward housing;
wherein an outlet at a most distal portion of the rearward housing has a longitudinal axis that is parallel to an axis of the most proximal portion of an airflow path through the rearward housing.