|Title of Invention||
"A BUCKLING IMPLANT"
|Abstract||This invention relates to a buckling implant used particularly in the surgery for retinal detachment comprises a tire buckle (1) having width of 7-9 mm preferably 7 and 9 mm provided with 5-7 radial ribs (2) having radius of curvature 3-4 mm with maximum height of 2.5 mm, wherein the said ribs (2) protruding out of its under surface.|
|Full Text||FIELD OF INVENTION
This invention relates to a buckling implant. In particular this invention relates to a buckling implant to be used in the surgery for retinal detachment.
BACKGROUND OF INVENTION
It is generally known that the retina a delicate membrane which lines the inside of the eye ball, is to the eye what the photographic film is to a camera. The outermost thick coat of the eye is sclera, which gives structural support to the eye ball. The large space inside of the retina is filled with a transparent tissue called vitreous. Ordinarily, vitreous provides an excellent support to the retina and acts as a shock absorber. Under certain disease conditions that the vitreous pulls on the retina, causing retinal tears or breaks. The fluid inside the vitreous seeps through the retinal break to accumulate under the retina, lifting it and causing retinal detachment. In order to reattach the retina by sealing the breaks the pulling forces of the vitreous is neutralized by pushing the sclera inwards by a procedure known as buckling. This is accomplished by the use of a buckling implant outside the eye wall, which buckles and pushes the sclera inwards. This surgery is known as the Scleral Buckling Surgery. This is the most widely used procedure in the surgery for rhegmatogenous ritenal detachment. It helps in neutralizing the centripetal vitreous traction forces, which is the commonest cause of retinal breaks and retinal detachments.
Since the vitreous traction can not be reduced or reversed and can be considered permanent, scleral buckling effect also has to be permanent, so that breaks do not form again. The only practical way of maintaining a permanent buckle is to place the buckle under an encircling element, a band which goes round the globe at the equator like a belt and tighten it. The tightening is done by shortening of the belt and reducing its length. This leads to reduction of the circumference of the globe at the equator. The more the shortening the greater is the height of the buckle.
In a normal eye of 24 mm diameter, the shortening of the encircling element can be between 8 to 20 mm. The preferred belt at present is a Silicon Band (# 240 style: 2.5 mm wide and 0.6 mm thick) This band is passed over the buckle which has a matching groove to accommodate the band.
The problem with the encircling buckles is that when the circumference of the sclera (the eye wall) is reduced to maintain a permanent buckle or to achieve a buckle of greater height or both and the circumference of the reduced eye wall is significantly less than the natural circumference of the detached retina inside, the excess retina show redundancy and go in to radial folds. A retinal break over such a fold will leak with fish mouthing of the traction retinal breaks and resulting in failure of retinal reattachment surgery.
The known design of the buckling implants have a smooth under surface that sits on the sclera. These do little in way of compensation of the redundancy of the retina under encircling buckles.
Traditionally, this situation is managed by the use of the radial buckles placed under the encircling element or under the tire buckles. However, these procedures are time consuming, more expensive, prone to infection and consistently demand far greater skill and therefore more likely to fail.
OBJECTS OF THE INVENTION
An object of the invention is to propose a new improved design of a buckle implant.
Another object of this invention is to propose a buckling implant which obviates the disadvantage associates with the prior ones.
Still another object of this invention is to propose a buckling implant which automatically compensates for the folds which are inevitable in encircling procedures.
Further objects and advantages of this invention will be apparent from the ensuing description.
STATEMENT OF INVENTION
According to this invention there is provided a buckling implant used particularly in the surgery for retinal detachment comprises a tire buckle provided with a plurality of radial ribs protruding out of its under surface.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Further objects and advantages of this invention will be more apparent from the ensuing description when read in conjunction with the accompanying drawings and wherein
Fig. 1 and Fig. 2 shows : sectional view of exemplary embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO ACCOMPANYING DRAWINGS
According to this invention, the under surface of a Tire buckle (1) which sits on the sclera and buckles it, instead of being smooth is having several radial ribs (2) protruding out of its under surface. The number, width and height of these ribs are so calculated as to adequately compensate the redundancy of the retina created by the reduction of the
circumference of the eye wall (sclera) following encircling buckling procedure.
In accordance with this invention, the implant may be made of silicon rubber or any other suitable material and has a plurality of ribs on its under surface, the surface sitting on the sclera at the equator of the eye globe. The radial elements would stretch the eye wall and lengthen the distance the retina must span, thereby take up the slack of redundancy that the reduction of the circumference of the eye ball at the equator that has been induced by the encircling buckling procedure. The number, width and length of the ribs are calculated to compensate the reduction of the circumference.
The specifications of the buckling implant are as follows:
1. Width of tire ÷7-9mm preferably 7 and 9 mm.
2. Inside circumference of the tire =60-80 mm.
3. Number of ribs =5-7.
4. Height of rib=maximum 2.5 mm at the center of the tire width
and tapered towards both edges of the tire.
5. Radius of curvature of the rib =3-4 mm depending upon the
number of ribs.
Further, the distance between two ribs depends upon its number.
It is to be noted that the present invention is susceptible to modifications, adaptations and changes by those skilled in the art. Such variant embodiments employing the concepts and features of this invention are intended to be within the scope of the present invention, which is further set forth under the following claims:-
1. A buckling implant used particularly in the surgery for retinal detachment comprises a tire buckle (1) having width of 7-9 mm preferably 7 and 9 mm provided with 5-7 radial ribs (2) having radius of curvature 3-4 mm with maximum height of 2.5 mm, wherein the said ribs (2) protruding out of its under surface.
2. A buckling implant as claimed in claim 1 wherein the tire is having inside circumference of 60-80 mm.
3. A buckling implant as claimed in any of the preceding claims wherein the implant may be made of silicon rubber or any other suitable material.
4. A buckling implant as claimed in any of the preceding claims wherein the height of the ribs is tapered towards both edges of the tire on its under surface.
|Indian Patent Application Number||2665/DEL/2005|
|PG Journal Number||09/2012|
|Date of Filing||05-Oct-2005|
|Name of Patentee||DR. B. PATNAIK|
|Applicant Address||C-2 GREATER KAILASH ENCLAVE II, NEW DELHI-110 007, INDIA.|
|PCT International Classification Number||A61F 2/14|
|PCT International Application Number||N/A|
|PCT International Filing date|