RU2294132C2 - Ophthalmologic device for measuring tissue tension - Google Patents

Abstract

FIELD: medical engineering.

SUBSTANCE: device has measuring instrument, means for recording tissue tension, tie-rod for making connection to tissues and supporting platform having guide members. The guides are connected to spring-loaded carriage. The carriage is fixable and movable along scale. The scale serves for measuring tissue elongation. Movable pressing member interconnected to the tie-rod is available on the carriage. The measuring instrument is engageable with movable pressing member. It is designed as electromechanical transducer having output connected to tension-recording means via amplifier. The tie-rod has hook and is manufactured as loop or frame. Cross size of the loop or frame in the area adjacent to the hook is not less than ¼ of the loop or frame.

EFFECT: no risk of injury.

4 cl, 3 dwg

Description

The invention relates to measuring medical equipment and can be used, in particular, in therapeutic and surgical ophthalmology to determine the degree of eyelid tension and the external angle of the palpebral fissure.

A device for measuring tissue tension is known, comprising a measuring means, a means for recording tension and a means for connecting with tissues (see SU 1512573 A1, 10/07/1989).

The device according to SU 1512573 can be effectively used in operations where large tensile forces are measured, and is not suitable, for example, for ophthalmic measurements.

Closer to the proposed invention is a device used in ophthalmology, containing a measuring tool, a means for recording tension and a tool for connecting with tissues (see SU 1069809 A, 01/30/1984, col. 3, 5-15).

Using the device according to SU 1069809, the tensile strength of the sclera is determined, and therefore, it is not an accurate measuring device, which can be used, for example, in operations for horizontal shortening of the lower eyelid. This operation is used to reposition for various anomalies in the position of the eyelids and includes suture tarsopexy with fixation to the periosteum of the orbital tubercle of the outer wall, which leads to the restoration of the normal position of the lower eyelid (Anderson RL, Gordy DD The tarsal lateral strip procedure. Arch. Ophthalmol. 1979; 2192; -2196).

Complications arising after such an operation are often associated with subjectivity in assessing the force applied to the lower eyelid, with the subjectivity of dosing the resection of the tarsal plate and with the lack of instrumental control of the lower eyelid tension before surgery. In particular, with hypercorrection, painful sensations in the area of the outer corner of the eye are observed, pain during blinking, discomfort, pulling sensation, binocular double vision, relapse.

With hypocorrection, in turn, there is no stability of the edge of the eyelid, a relapse of the eversion of the eyelids, depression of the lower eyelid, progression of the corneal pathology develops.

The problem to which the present invention is directed, is to create an accurate specialized ophthalmic device for measuring tissue tension, capable, in particular, to provide instrumental control of the lower eyelid tension force and optimal resection of the ligamentous apparatus of the lower eyelid.

The technical result of the invention is manifested in the non-invasiveness of the device, in particular in sparing contact with the eyelid of its means, made to connect with tissues and which is part of a structure capable of measuring, including small forces.

The invention is expressed in a combination of essential features, in which an ophthalmic device for measuring tissue tension, comprising a measuring means, a means for recording tension and traction for connecting with tissues, differs from the closest analogue in that it further comprises an amplifier and a supporting platform with guides that are connected to spring-loaded carriage, with the ability to fix and move along a scale made to determine the elongation of tissues, and the supporting platform and the carriage equipped with handles, a movable clamp interconnected with the rod is placed on the carriage, and the measuring means is installed with the possibility of interacting with the movable clamp and is made in the form of an electromechanical converter with an output connected through an amplifier to the tension registration means, while the rod has a hook and is made in the form of a loop or a frame with a transverse dimension in a portion adjacent to the hook that is at least 1/4 of the transverse dimension of the loop or frame.

The above set of essential features is sufficient to achieve the technical result of the invention in all cases to which the requested amount of legal protection applies.

In special cases of its implementation or use, an ophthalmic device for measuring tissue tension may include a carriage, which can be spring-loaded with coil springs mounted on guides in the form of cylindrical rods; an electromechanical converter made in the form of a load cell or in the form of a bridge of load cells, and an amplifier having a cascade transistor circuit; tension registration means having a digital display and a balancing unit with an integrator and with an analog-to-digital converter, the input of the integrator can be connected to the output of the amplifier, and the input of the analog-to-digital converter can be connected to the output of the integrator, while the output of the analog-to-digital converter can be connected to a digital display, the device can be made for mounting on a means of spatial positioning, for example, for mounting on a slit lamp.

The causal relationship of the listed features of the independent claim with its technical result is that the measuring tool, the registration means of tension and traction for connecting with the tissues are necessary elements to ensure essentially any instrumental control and, in particular, instrumental control pulling forces of the lower eyelid.

Since the measurement of tissue tension is accompanied by the application of mechanical force to these tissues, the surgeon must be able to accurately move the elements of the device and not experience any inconvenience when using it. Convenience and accuracy are provided by handles, an amplifier and a scale for determining the elongation of tissues, as well as a support platform with guides that are connected to a spring-loaded carriage, a movable clamp placed on the carriage and interconnected with the traction, and measuring means installed with the possibility of interaction with the movable clamp and made in the form of an electromechanical converter with an output connected through an amplifier with a means of recording tension.

The execution of traction in the form of a loop or frame in combination with a hook makes it possible to capture fabrics with a reduced load in the contact zone. In this case, the execution of traction in the form of a loop or frame with a transverse dimension in the area adjacent to the hook, which is at least 1/4 of the transverse size of the loop or frame, allows due to the reduced size of one side to be easily placed between the eyeball and the eyelid, and on the other hand have a sufficiently large area of support.

The signs listed in the dependent claims are aimed at the most rational implementation of the device, which optimizes the operation and, accordingly, improves treatment outcomes.

For example, the output of an analog-to-digital converter connected to a digital board reduces the time for surgery due to a more convenient perception of the measurement results, and the location of the device on a spatial positioning device, such as a slit lamp, makes it possible to carry out the measurement without contacting an assistant.

The invention is illustrated by drawings, where figure 1 shows a General view of an ophthalmic device for measuring tissue tension, figure 2 is a longitudinal section of a part of a device designed to interact with tissues, and one of the projections of this part, and figure 3 is a structural circuit electrical elements of the device.

An ophthalmic device for measuring tissue tension comprises a measuring tool 1, a tension recording means 2 and a traction 3 for connecting with tissues, an amplifier 4 on the board 5 and a supporting platform 6 with guides 7 that are connected to the spring-loaded carriage 8. The carriage 8 has the ability to fix and move along a scale 9 made to determine the elongation of tissues. A movable clamp 10 is placed on the carriage 8, interconnected with the rod 3. The measuring means 1 is installed with the possibility of interaction of the contact element 11 with the movable clamp 10 and is made in the form of an electromechanical converter with an output connected via an amplifier 4 to the tension registration means 2.

In special cases of its implementation or use, an ophthalmic device for measuring tissue tension may contain a supporting platform 6 and a carriage 8, which are equipped with handles 12 and 13, and the rod 3 for connecting with tissues has a hook 14 and is made in the form of a loop or frame. The transverse dimension of the loop or frame in the area adjacent to the hook 14 may be at least 1/4 of the transverse dimension of the loop or frame. The carriage 8 can be spring-loaded with coil springs 15 mounted on guides 7 in the form of cylindrical rods. The electromechanical converter can be made in the form of a load cell or in the form of a bridge of load cells, and the amplifier 4 can have a cascade transistor circuit. The tension recording means 2 can have a digital display 16 and a balancing unit with an integrator 17 and with an analog-to-digital converter 18, the input of the integrator 17 can be connected to the output of the amplifier 4, and the input of the analog-to-digital converter 18 can be connected to the output of the integrator 17, the output of the analog-to-digital Converter 18 can be connected to a digital display 16. The device can be made for mounting on a spatial positioning device, for example for mounting on a slit lamp. The device includes a power supply 19 and a latch 20. Parts of the device are connected by electric wires 21.

During operation, an ophthalmic device for measuring tissue tension is connected to the network using a power supply 19. Then, holding the device by the handles 12 and 13, a hook 14 of the rod 3 is placed between the eyeball and the eyelid of the patient.

Since the thrust 3 is performed, as a rule, in the form of a loop or frame, the transverse dimension of which on the portion adjacent to the hook 14 is at least 1/4 of its diameter, the hook 14 due to the reduced size of one side is easily placed between the eyeball and the eyelid, and on the other hand, has a sufficiently large footprint. Violation of this ratio makes the support of the hook 14 on the fabric for eye surgery insufficient and can lead to injury.

Press the handle 13 with fingers and move it together with the spring-loaded carriage 8 relative to the supporting platform 6. The hook 14 thus pulls the eyelid, and the rod 3 moves the movable clip 10.

The movable clamp 10 interacts with the contact element 11 of the measuring means 1, made in the form of an electromechanical transducer, which may be, for example, a strain gauge or strain gauges connected by a bridge circuit. As a result, the mechanical tension force of the eye eyelid is converted into an electrical signal, which is transmitted through the amplifier 4 and wires 21 to the integrator 17 and the analog-to-digital converter 18 of the tension registration means 2.

After converting the analog signal to a digital code on the scoreboard 16 appears indications of traction.

To ensure stability of readings after eyelid tension over a selected length, a spring-loaded carriage 8 is fixed relative to the supporting platform 6 by a latch 20 due to its interaction with one of the guides 7. Then, using the scale 9, the eyelid extension length is determined.

To return the rod 3 to its original position, coil springs 15 are used, which, after releasing the fixation, return the carriage 8 to its original position, relieving the load from the contact element 11 of the measuring means 1.

Claims (4)

1. An ophthalmic device for measuring tissue tension, comprising a measuring means, a means for recording tension and traction for connecting with tissues, characterized in that it further comprises an amplifier and a support platform with guides that are connected to a spring-loaded carriage that can be fixed and moved along the scale, made to determine the elongation of tissues, and the supporting platform and the carriage are equipped with handles, a movable clip interconnected with the traction is placed on the carriage, and the measuring The device is installed with the possibility of interacting with the movable clamp and is made in the form of an electromechanical transducer with an output connected through an amplifier with a means of recording tension, while the rod has a hook and is made in the form of a loop or frame with a transverse dimension on the adjacent portion of the hook of at least 1 / 4 of the transverse dimension of the hinge or frame. 2. The device according to claim 1, characterized in that the carriage is spring-loaded with coil springs mounted on guides in the form of cylindrical rods. 3. The device according to claim 1, characterized in that the electromechanical converter is made in the form of a load cell or in the form of a bridge of load cells, and the amplifier has a cascade transistor circuit. 4. The device according to claim 1, characterized in that the tension registration means has a digital display and a balancing unit with an integrator and with an analog-to-digital converter, the input of the integrator connected to the output of the amplifier, and the input of the analog-to-digital converter connected to the output of the integrator, this output analog-to-digital Converter is connected to a digital display.

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