1. A medical device for tissue ligation comprising:
an elongated, flexible band having a front side, a rear side, a leading end and a trailing end, and having ratchet members defined therein;
a device head connected to said trailing end of said band and having a channel dimensioned for reception of said band;
a lock member connected to said device head and disposed in connection with said channel and having at least one lock tooth configured to interlock ratchet member defined in said band,
a protrusion arranged in one of
i) said device head on a same side relative to said channel as said trailing end, wherein said same side comprises an entrance of said channel in said device head, and said protrusion is arranged in connection with said entrance so that said protrusion is at least partially outside said channel, and
ii) said band in connection with said trailing end; and
a protrusion receiving member in the form of an aperture or an indentation arranged in the other of
i) said device head on said same side relative to said channel as said trailing end, wherein said same side comprises an entrance of said channel in said device head, and said protrusion receiving member is arranged in connection with said entrance so that said protrusion receiving member is at least partially outside said channel, and
ii) said band in connection with said trailing end,
said protrusion receiving member being dimensioned for reception of said protrusion.
2. The medical device according to claim 1, wherein said protrusion is arranged in said device head on said same side relative to said channel as said trailing end.
3. The medical device according to claim 2, wherein said lock tooth is configured to interlock said ratchet members defined in said band when said band is fed into said channel and said protrusion receiving member is configured and dimensioned for reception of said protrusion when said band is fed into said channel.
4. The medical device according to claim 1, wherein said protrusion receiving member is provided in said band in an interface between said trailing end and said device head.
5. The medical device according to claim 1, wherein said lock tooth is configured to interlock said ratchet members defined in said band when said band is fed into said channel and said protrusion receiving member is configured and dimensioned for reception of said protrusion when said band is fed into said channel.
6. The medical device according to claim 5, wherein said protrusion receiving member is positioned for reception of said protrusion when said band is fully fed into said channel.
7. The medical device according to claim 1, wherein said protrusion receiving member is an aperture or indentation defined in said band.
8. The medical device according to claim 7, wherein said front side has said ratchet members defined therein.
9. The medical device according to claim 1, wherein an intermediate portion of said band between said leading end and said trailing end is bent.
10. The medical device according to claim 9, wherein said intermediate portion of said band has a general U-shape.
11. The medical device according to claim 1, further comprising at least one tissue engaging member arranged on a side of said device head comprising said band entrance of said channel.
12. The medical device according to claim 11, further comprising
a first tissue engaging member; and
a second tissue engaging member, said first and second tissue engaging members being arranged on opposite sides of said channel on said side of said device head comprising said band entrance of said channel.
13. The medical device according to claim 11, wherein said at least one tissue engaging member comprises multiple studs for engagement with a tissue and restricting relative movement between said tissue and said medical device when said band is being fed into said channel.
14. The medical device according to claim 1, wherein said device head being integral with and extending from said trailing end of said band.
15. The medical device according to claim 1, wherein said medical device is made of a bio-absorbable material.
16. The medical device according to claim 1, wherein said lock member and said ratchet member are arranged for inter-engagement to permit forward movement of said band through said channel but restrain the band against reverse movement through said channel.
17. The medical device according to claim 1, wherein said ratchet members comprises an array of holes through said band forming a ladder structure, said locking tooth is arranged for step-by-step protrusion into holes of said array as said band is being fed through said channel.
18. The medical device according to claim 1, further comprising a protruding tissue engaging member arranged on said front side of said band in connection with said trailing end of said band.
19. A tissue ligation method comprising:
providing a medical device according to claim 1 on a first side of said tissue;
inserting said leading end of said band into said channel to form a loop of said band around said tissue; and
pulling said leading end of said band through said channel to lock said band around said tissue and achieve a tissue ligation.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A system for compensating drift in a control circuit, the system comprising:
a first control signal, wherein the first control signal is provided by a circuit susceptible to drift;
a detection circuit electrically coupled to the first control signal, wherein the detection circuit is operable to detect a drift in the first control signal; and
a second control signal provided by the detection circuit, wherein the second control signal varies as a function of the drift in the first control signal.
2. The system of claim 1, wherein the drift is a temperature drift.
3. The system of claim 1, wherein the first control signal is a fine control signal, and wherein the system further includes:
a coarse control signal;
and wherein the second control signal is operable to maintain an operation within a range indicated by the fine control signal.
4. The system of claim 3, wherein the system further includes:
a voltage controlled oscillator, wherein the voltage controlled oscillator provides an output frequency based at least in part on all of the fine control signal, the coarse control signal, and the second control signal; and
a very low pass filter, wherein the second control signal is provided to the voltage controlled oscillator via a very low pass filter.
5. The system of claim 1, wherein the system further includes:
a voltage controlled oscillator, wherein the voltage controlled oscillator provides an output frequency based at least in part on both the first control signal and the second control signal.
6. The system of claim 5, wherein the first control signal and the second control signal are combined, and wherein the combination of the first control signal and the second control signal are applied to a single input of the voltage controlled oscillator.
7. The system of claim 5, wherein the detection circuit is implemented at least partially in the digital domain, and wherein the voltage controlled oscillator is implemented in the analog domain.
8. The system of claim 7, wherein the first control signal is provided to the detection circuit in the digital domain, and provided to the voltage controlled oscillator in the analog domain.
9. The system of claim 1, wherein the system further includes:
a motor controller, wherein the motor controller provides a motor control output based at least in part on both the first control signal and the second control signal, and wherein the motor controller is operable to maintain a motor associated with the motor controller within a range indicated by the first control signal.
10. A method for drift compensation, the method comprising:
providing a control circuit, wherein the control circuit outputs a first control signal, and wherein the control circuit is susceptible to a temperature drift;
monitoring the first control signal, wherein a variance associated with the temperature drift is detected in the first control signal; and
providing a second control signal, wherein the second control varies as a function of the variance associated with the temperature drift.
11. The method of claim 10, wherein the control circuit forms part of a phase lock loop circuit, and wherein the method further comprises:
providing a voltage controlled oscillator; and
driving a voltage controlled oscillator with both the first control signal and the second control signal.
12. The method of claim 11, wherein monitoring the first control signal is performed in the digital domain, and wherein driving the voltage controlled oscillator with both the first control signal and the second control signal is done in the analog domain.
13. The method of claim 10, wherein the first control signal is a fine control signal, and wherein the control circuit further outputs a coarse control signal.
14. The method of claim 13, wherein the control circuit forms part of a phase lock loop circuit, and wherein the method further comprises:
providing a voltage controlled oscillator;
driving a voltage controlled oscillator with all of the fine control signal, the coarse control signal, and the second control signal; and
wherein a frequency output of the voltage controlled oscillator is maintained within a range indicated by the fine control signal.
15. A phase lock loop circuit, the circuit comprising:
a controlled oscillator, wherein the controlled oscillator is electrically coupled to at least a first control signal and a second control signal;
a detection circuit, wherein the detection circuit is electrically coupled to the first control signal and to the second control signal, and wherein the detection circuit is operable to detect a drift in the first control signal and to provide the second control signal as a function of the drift in the first control signal.
16. The circuit of claim 15, wherein the drift in the first control signal is a temperature drift.
17. The circuit of claim 15, wherein the first control signal is a fine control signal, and wherein the system further includes:
a coarse control signal, wherein the coarse control signal is applied to the controlled oscillator; and
wherein the second control signal is operable to maintain an output frequency of the controlled oscillator within a range indicated by the fine control signal.
18. The circuit of claim 15, wherein the detection circuit is implemented at least partially in the digital domain, and wherein the controlled oscillator is implemented in he analog domain.
19. The circuit of claim 18, wherein the first control signal is provided to the detection circuit in the digital domain, and wherein the first control signal is provided to the voltage controlled oscillator in the analog domain.
20. The circuit of claim 15, wherein the first control signal and the second control signal are electrically coupled to respective inputs on the controlled oscillator.