Phacoemulsification handle with sensor and surge control system and method
An ultrasonic phacoemulsification handpiece with a sensor and a surge control system and a method. The central aspiration lumen of the ultrasonic phacoemulsification handpiece consists of two components of plug-in loose fit: a fixed lumen and an extension lumen; a small pressure sensor is mounted on the extension lumen, but still able to keep the easy-to-use size and maintain the ultrasonic performance of the handpiece. The extension lumen minimizes the effect of ultrasonic vibration on the sensor while maintaining sufficient stiffness for installing and removing the phacoemulsification tip. The design of the handpiece transducer reduces the effect of this sensor installation on the ultrasonic performance. For ultrasonic phacoemulsification cataract removal surgery, the short distance from the pressure sensor to the surgical site provides a technical solution for reliably controlling the risk of the post occlusion surge.
1 . A phacoemulsification handpiece, comprising:
a handpiece housing having a distal end and a proximal end;
a phacoemulsification tip arranged at the distal end of the handpiece housing;
an aspiration connector arranged at the proximal end of the handpiece housing; and
a transducer part and an extension part arranged inside the handpiece housing, wherein the transducer part comprises a horn and a driving element being piezoelectric ceramic, wherein a distal end of the horn is threaded to threadedly couple to the phacoemulsification tip, and a proximal end of the horn is a fixed lumen,
wherein the extension part comprises an extension lumen coupled to the fixed lumen in a loose fit connection that ultrasonically decouples the fixed lumen from the extension lumen, the extension part further including a sensor attached to the extension lumen,
wherein at least one of the extension lumen covers over an outer periphery of the fixed lumen, or the fixed lumen covers over an outer periphery of the extension lumen, which prevents a circumferential rotation between the extension lumen and the fixed lumen, and
wherein inner bores of the extension lumen and the fixed lumen are connected with the phacoemulsification tip to form an aspiration channel.
2 . The phacoemulsification handpiece according to claim 1 wherein the sensor is a piezoresistive microelectromechanical pressure sensor.
3 . The phacoemulsification handpiece according to claim 1 wherein the sensor is attached to a side of the extension lumen by adhesive bonding, and wherein a wire of the sensor is arranged in a phacoemulsification handpiece cable.
4 . The phacoemulsification handpiece according to claim 1 , wherein the extension part includes a sealing elastomer and is covered by the sealing elastomer on an outside of a connecting area between the extension lumen and the fixed lumen, and wherein the sealing elastomer is a mechanical bond that prevents longitudinal movement of the extension lumen relative to the fixed lumen.
5 . The phacoemulsification handpiece according to claim 1 comprising an anti-rotation structure including mating flat surfaces at connection ends of the extension lumen and the fixed lumen.
6 . The phacoemulsification handpiece according to claim 1 wherein the driving element is fixed on a periphery of the horn by an end mass.
7 . The phacoemulsification handpiece according to claim 6 wherein a protruding length of a proximal end of the fixed lumen is a length from a proximal end of the end mass to the proximal end of the fixed lumen, wherein the protruding length does not exceed ⅛ wavelength of an operating frequency of the handpiece.
8 . The phacoemulsification handpiece according to claim 1 wherein the transducer part comprises an amplifying section and a driving section, and wherein a diameter of the amplifying section is less than ½ of a diameter of the driving section.
9 . The phacoemulsification handpiece according to claim 8 wherein a length of the driving section is between ¼ and ½ of a wavelength of the horn at an operating frequency of the handpiece.
10 . The phacoemulsification handpiece according to claim 1 wherein the horn and the fixed lumen are an integral single body or rigidly fixed together.
11 . The phacoemulsification handpiece according to claim 1 wherein the handpiece housing includes an irrigation tube, and wherein a proximal end of the irrigation tube is an irrigation connector configured to connect to an irrigation source.
12 . A surge control system, comprising:
a console,
a handpiece cable,
the phacoemulsification handpiece as described in claim 1 coupled to the console through the handpiece cable, and wherein the console has a built-in ultrasonic generator,
an irrigation source connected to the phacoemulsification handpiece through an irrigation tubing,
a vacuum generating device connected to the phacoemulsification handpiece through an aspiration tubing, and connected to a waste fluidic bag through a waste fluidic cavity and a waste fluidic channel, and
a normally closed aspiration valve arranged between the aspiration tubing and the waste fluidic cavity and connected to the console through a first signal line, a negative pressure release channel arranged between the aspiration valve and the waste fluidic cavity.
13 . The surge control system according to claim 12 wherein the irrigation tubing has an irrigation sensor and an irrigation valve connected to the console through second and third signal lines.
14 . A method for using the phacoemulsification handpiece of claim 1 , comprising:
connecting an irrigation source to the phacoemulsification handpiece through an irrigation tubing;
connecting the phacoemulsification handpiece to a console through a handpiece cable, and wherein the console has a built-in ultrasonic generator;
connecting a vacuum generating device to the phacoemulsification handpiece through an aspiration tubing, including connecting the vacuum generating device to a waste fluidic bag through a waste fluidic cavity and a waste fluidic channel;
arranging a normally closed aspiration valve between the aspiration line and the waste fluidic cavity, and connecting the normally closed aspiration valve to the console through a first signal line, wherein a negative pressure release channel is arranged between the aspiration valve and the waste fluidic cavity;
using the sensor, measuring a pressure value in the aspiration channel; and
using the console, calculating a rate of pressure change, and setting a threshold in the console according to one or more fluidic system parameters, wherein when the rate of pressure change is greater than the threshold, the console controls the aspiration valve to open, and a negative pressure in the aspiration channel is released through the negative pressure release channel.
15 . The method according to claim 14 wherein the fluidic system parameters include an intraocular pressure, an equivalent bottle height, a diameter of the phacoemulsification tip, and a maximum vacuum setting.
16 . A phacoemulsification handpiece comprising:
a handpiece housing;
a phacoemulsification tip arranged at a distal end of the handpiece housing;
an aspiration connector arranged at a proximal end of the handpiece housing;
a transducer part and an extension part arranged inside the handpiece housing, wherein inner bores of the transducer part and the extension part are connected with the aspiration connector to form an aspiration channel; and
a sensor coupled to the extension part,
wherein between the transducer part and the extension part is a plug-in loose fit connection that ultrasonically decouples the transducer part and the extension part and wherein a connecting end of the transducer part includes a mating surface configured to engage with a corresponding mating surface of the extension part to prevent a circumferential rotation between the transducer part and the extension part.
17 . The phacoemulsification handpiece according to claim 16 wherein the transducer part comprises a horn and a driving element, and wherein the driving element is piezoelectric ceramic, wherein a distal end of the horn is threaded to threadedly couple with the phacoemulsification tip, wherein the extension part comprises an extension lumen and the sensor fixed on a side of the extension lumen by adhesive bonding, wherein a distal end of the extension lumen and a proximal end of the horn are in a plug-in loose fit that ultrasonically decouples the distal end of the extension lumen and the proximal end of the horn, wherein inner bores of the extension lumen and the horn are connected with the phacoemulsification tip to form an aspiration channel.
18 . A phacoemulsification handpiece, comprising:
a housing including a phacoemulsification tip and an aspiration connector;
a transducer inside the housing including a horn and a drive, wherein a distal end of the horn is removably coupleable to the phacoemulsification tip and a proximal end of the horn terminates in a fixed lumen; and
an extension assembly including an extension lumen in fluid communication with the fixed lumen and a sensor coupled to the extension lumen, both the extension lumen and the sensor being enclosed in the housing,
wherein a plug-in loose fit connection is provided between the extension lumen and the fixed lumen such that the extension lumen ultrasonically decouples from the fixed lumen to prevent vibration of the sensor, and
wherein a connecting end of the extension lumen includes a non-circular surface that mates with a further non-circular surface of the fixed lumen to prevent rotation of the extension lumen relative to the fixed lumen.
19 . The phacoemulsification handpiece of claim 18 , further comprising:
a sealing elastomer at the interface between the fixed lumen and the extension lumen that prevents pulling disengagement of the extension lumen relative to the fixed lumen.
20 . The phacoemulsification handpiece of claim 18 , wherein the extension lumen is rigid.