Patent Application
20180193116
The present invention relates to a medical appliance, particularly to a memory elastic filament cannula for stripping away maxillary sinus floor mucosa, which is applicable to implant of maxillary sinus floor mucosa and (or) bone graft.
Oral implantology is one of the fields that developed fastest in the oral medicine in recent years. It is clinically common that implant failure ratio increases due to the insufficient bone that combine with the implant when the alveolar crest in the maxillary molar area is close to the maxillary sinus floor. The maxillary molar region with insufficient vertical bone amount has once been considered as the forbidden region for dental implant.
The maxillary sinus elevation technique brings about possibility of addressing the above-mentioned problem once it is proposed.
Sinus lifting is classified into one kind of sinus lifting by windowing in sidewall, namely outside sinus lifting (Tatum OH. Maxillary and sinus implant reconstruction[J]. J Dent Clin North Am, 1986, 30(2):207-229.) and the other kind of sinus lifting by accessing through alveolar crest, namely in sinus lifting (Summers RB. The osteotome technique. Part 3: Less invasive met hods in elevation of the sinus floor[J]. J Compendium of Continuous Education in Dentistry, 1994, 15:698-708.)
Sinus floor lifting by windowing in sidewall may strip away sinus floor mucosa by a large area, reducing the sinus floor mucosa's tension, may implant more bone dust to effectively increase bone height at the floor, and extends the indications of implant. However, the technique is complex and uses existing instruments for operation for a long time, and perforation likelihood increases when the striping range increases, which makes it be limited in clinical promotion.
Sinus floor lifting by accessing through alveolar crest has advantages such as small operative wound, less postoperative complications, reduced treatment time and low cost and has been appreciated and accepted by clinical physicians. However, when the lifting amount is greater than 5 mm, and the risk of tearing sinus mucous increases significantly with common complications such as perforation of sinus mucous, formation of dead bone and maxillary sinusitis. In recent years, advanced technologies such as balloon, hydraulic pressure and piezosurgery have been applied to sinus floor lifting by accessing through alveolar crest to increase the lifting height and reduce the risk of sinus mucous perforation. However, the lifting height is limited, and it is reported by documents 2-7 mm may be lifted (Lixn Qiu, Xiulian Hu, Bo Chen et al. Clinical observation of implant repairing 122 missing teeth by sinus floor punch lifting [J]. Chinese Journal of Stomatology, 2006, 41:136-139; Nedir R, Bischof M, Vazquez L, et al. Osteotome sinus floor elevation without grafting material: a 1-year prospective pilot study with ITI implants[J]. J Clin. Oral Impl. Res, 2006, 17: 679-686; Winter AA, Pollack AS, Odrich RB. Sinus/alveolar crest tenting (SACT): a new technique for implant placement in atrophic maxillary ridges without bone grafts or membranes[J]. The International Journal of Periodontics & Restorative Dentistry, 2003, 23: 557-565). The main reason is that the inside lifting can only strip away small range of mucous membrane by appliance although it causes small operative wound.
The present invention creatively provides a medical appliance in view of the problems with striping away sinus floor mucous by appliance, which can be used in striping away large area of sinus floor mucous by accessing through alveolar crest or by windowing in sidewall, safe and effective, having promising clinical application value.
The object of the present invention is to provide a cannula with memory elastic filament for striping away sinus mucous, which includes a primary striping structure and a secondary striping structure, said primary striping structure consisting of a hollow cannula and a striping edge at the top of the hollow cannula, said secondary striping structure adopts an elastic filament, characterized in that said elastic filament has ultra-elasticity and/or memory, the elastic filament passes into the hollow cannula from its bottom, and the striping edge controls the elastic filament to extend forward and downward from the end of the hollow cannula.
Furthermore, the part of the elastic filament that extend beyond the hollow cannula is referred to as striping filament that is variable in terms of size, extension direction and shape.
Furthermore, the elastic filament is bent into double strands and the part of the elastic filament that extends beyond the hollow cannula is referred to as striping filament (8).
Furthermore, the elastic filament is machined to have a shape suitable for striping away the maxillary sinus floor mucous and the elastic filament is penetrated into the hollow cannula during assemble of said cannula with memory elastic filament.
Preferably, said shape suitable for striping away the maxillary sinus floor mucous is an arc or cone.
Furthermore, the striping filament is of an irregular circle shape.
Furthermore, the striping filament expands so as to be hidden in the striping edge but can not continue retracting into the hollow cannula.
Furthermore, the striping edge is of an arc shape and/or an end of the hollow cannula has a holding portion; and/or an end of the elastic filament has a stop plug; and/or the hollow cannula is marked with scale; and/or the elastic filament is marked with scale.
Preferably, the distance between scale marks is preferably 0.5-1 mm.
Preferably, the holding portion is sized to facilitate holding, and more preferably, the holding end has a diameter greater than 7 mm.
When the elastic filament is bent into double strands, an end of each strand has a stop plug, wherein when the stop plug is pushed or pulled, the elastic filament expands or shrinks and the striping filament changes its size; when the stop plug is rotated, the elastic filament is rotated, and the striping filament reverses; when the stop plugs remain in different motions, the striping filament changes it shape; and when one of the stop plugs keeps stationary and the other moves, the striping filament changes its shape.
Preferably, the stop plug may move along the elastic filament and be secured at a specified position.
More preferably, at the beginning of striping away the maxillary sinus mucous, when only the primary striping structure is used, the stop plug is moved to the middle section of the elastic filament and secured such that the striping filament is hidden in the striping edge and can not continue retracting into the hollow cannula.
Furthermore, the material for said memory elastic filament is nonmetal and/or metal alloy.
Furthermore, the hollow cannula has a diameter of 1-4 mm, the elastic filament has a diameter of 0.3-0.6 mm, and the striping edge has a length of 1-5 mm.
Preferably, the hollow cannula has a diameter of 2-3 mm, the elastic filament has a diameter of 0.3-0.46 mm, and the striping edge has a width of 3-4 mm.
Another object of the present invention is to provide a kit of cannulas with memory elastic filament, consisting of a number of sets of cannulas with memory elastic filament with different models and different sizes.
Further, the elastic filaments in the kit have a diameter of 0.3048 mm (0.012 inch), 0.3556 mm (0.014 inch), 0.4064 mm (0.016 inch) etc., respectively.
In the present invention, the primary striping structure may strip away the maxillary sinus floor mucous alone, but the secondary striping structure needs the help of the primary striping structure to strip away the sinus mucous.
The present invention may strip away the maxillary sinus floor mucous broadly and facilitate lifting the bone height.
In the animal experiment of sheep and the clinical experiment, the striping length obtained at a flat sinus floor is 23.03±4.92 mm, and the striping length at sinus floor with a slope 60°˜90° is 19.00±5.06 mm.
The present invention has advantages in the following aspects:
1. The present invention has a larger striping range of mucous than traditional single stripper.
2. The secondary striping structure adopting an ultra-elastic and/or memory elastic filament is used as a dulledge to striping away mucous membrane for with a sound effect.
3. During implementation, the present invention has a secondary striping structure (primary striping structure and secondary stripping structure) and can accomplish five operations:
(1) striping away the sinus floor mucous membrane priliminarily with the primary striping structure;
(2) using the secondary striping structure to allow the striping filament to extend out of the striping edge, thereby further striping away the sinus floor mucous membrane;
(3) rotating the hollow cannula horizontally to rotate the striping filament horizontally, striping away mucous around the position of accessing plane;
(4) securing the hollow cannula and rotating the elastic filament or stop plug horizontally to reverse (turn around) the striping filament, striping away mucous membrane on a steep rising bone wall;
(5) securing the hollow cannula with elastic filament or stop plug on both ends remaining in different motions to change the shape of striping filament, striping away the mucous membrane.
4. The memory elastic filament cannula equipment provided in the present invention is simple and small.
5. The present invention provides a kit of memory elastic filament cannulas, in which hollow cannulas of different models may be selected according to the diameter of the implant hole, elastic filaments with different diameters may be selected according to resilience of the mucosa, which has elasticity, strength and gental force, may effectively reduce the probability of sinus mucosa perforation, facilitating practical clinical operation.
The elastic filament mentioned in the present invention refers to a substance with ultra-elasticity and/or memory characteristics synthesized by a certain method with nonmetal or two or more metal and metal (or nonmetals).
Ultra-elasticity refers to a phenomenon in which a material has an elasticity potential function that is a scalar function of the strain tensor, the derivative of its corresponding strain component is the corresponding stress component and the strain may restore automatically while offloaded.
The stress and strain are no longer in a linear corresponding relationship, but correspond to each other in the form of elastic energy function.
Memory refers to the performance of a material that can restore after deformation.
The shape of the end of the elastic filament mentioned in the present invention is not limited to circle but may be various shapes such as ellipse, quadrilateral and polygon.
The striping edge refers to the part of the primary striping structure that is located at the top of the hollow canulla which may control the elastic filament to extend downward and forward from the end of the hollow canulla.
The striping edge is preferably of an arc shape.
The present invention utilizes the ultra-elasticity and/or memory of the elastic filament. Upon the beginning of the product manufacturing, the elastic filament (especially, it is end) is processed to have a shape suitable for striping away the sinus floor mucosa. During the product assembly, the elastic filament is placed into the hollow canulla. And while in use, the striping filament still maintains the shape suitable for striping the sinus floor mucosa.
Furthermore, the cannula with memory elastic filament while used needs the ultra-elasticity and/or memory of the elastic filament to adapt to various complex striping conditions.
In the figures,
1. Striping edge; 2. Hollow cannula; 3. Holding end; 4. Elastic filament; 5. Annular scale; 6. Scale; 7. Stop plug; 8. Striping filament; 9. The height of alveolar bone; 10. Bone hole; 11. maxillary sinus mucous
The present invention will be further described below with respect to specific embodiments which only serves to explain the present invention rather than being construed to limit the present invention. Those of ordinary skill in the art may understand that these embodiments may be subject to various changes, modifications, substitutions and variations without departing from the principle and spirit of the present invention and the scope of the present invention is only defined by the claims and equivalents thereof.
Striping away the maxillary sinus floor mucous with the primary striping structure: placing the hollow cannula 2 into the bone hole 10 slowly, holding the hollow cannula 2 or the holding end 3 to strip away mucous with the striping edge, slowly rotating the hollow cannula 2 horizontally to strip away the maxillary sinus floor mucous 11 by one round, thereby obtaining a striping range of about 3 mm around the hole.
Striping away the maxillary sinus floor mucous with the secondary striping structure: placing the hollow cannula 2 into the bone hole 10 slowly (now the striping filament 8 is hidden in/under the striping edge 1), and operating the elastic filament 4 or the stop plug 7 to allow the striping filament 8 extend downward and forward along the striping edge 1. Suitable striping length may be selected according to the required lifting height.
Striping away the maxillary sinus floor mucous with the secondary striping structure: placing the hollow cannula 2 into the bone hole 10 slowly (now the striping filament 8 is hidden in/under the striping edge 1), and operating the elastic filament 4 or the stop plug 7 to allow the striping filament 8 extend downward and forward along the striping edge 1. Then, rotating the hollow cannula 2 or the holding end 3 horizontally and drive the striping filament 8 to rotate with the hole midpoint as a center, which may strip away mucous around the hole in a large range.
Striping away the maxillary sinus floor mucous with the secondary striping structure: placing the hollow cannula 2 into the bone hole 10 slowly (now the striping filament 8 is hidden in/under the striping edge 1), and operating the elastic filament 4 or the stop plug 7 to allow the striping filament 8 extend downward and forward along the striping edge 1. In a condition that there is a steep rising bone wall away from the hole, since the striping edge 1 restricts the striping filament 8 to only extend forward and downward and block the striping filament 8 from extending further forward, it is now possible to secure the hollow cannula 2 or the holding end 3 and rotate the elastic filament 4 or the stop plug 7 such that the striping filament 8 reverses with the striping edge 1 as the center and in turn strip away the maxillary sinus mucous 11 proximate to the steep rising and further crawl farther.
Striping away the maxillary sinus floor mucous with the secondary striping structure: placing the hollow cannula 2 into the bone hole 10 slowly (now the striping filament 8 is hidden in/under the striping edge 1), and operating the elastic filament 4 or the stop plug 7 to allow the striping filament 8 extend downward and forward along the striping edge 1. Secure the hollow cannula 2 and allow the two stop plugs 7 to keep different motions such that the striping filament 8 changes its shape for striping away mucous with striping filament 8 with different shapes. Alternatively, secure one end of the elastic filament 4 or the stop plug 7 and draw the other end of the elastic filament 4 or the stop plug 7 such that the striping filament 8 changes its shape for striping away mucous with striping filament 8 with different shapes.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201510548208.1 | Aug 2015 | CN | national |
| 201520669139.5 | Aug 2015 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2015/089842 | 9/17/2015 | WO | 00 |
