ES2351563B1 - IMPROVEMENTS IN PATENT P200800991 PER SYSTEM FOR THE PRACTICE OF OSTEOTOMY. - Google Patents

Abstract

Refinements in the invention patent P200800991 by system for the practice of osteotomy. # This system comprises: a cannulated screw device (1) with an inner recess (12) in which a knife holder part (3) is housed and with one or more longitudinal grooves (13, 13?) for the passage of respective blades (2, 2?) of the blade holder part (3), an applicator (5) for actuation of the holder part (3) blades and a spring (6) for the recoil of said piece (3) blade holder. The inner hollow (12) and the blade holder part (3) have a non-circular section and define on the opposite side surfaces complementary means of longitudinal guidance (15, 31) that prevent the rotation of the piece (3) in the inner hollow (12).

Description

In accordance with the invention and with the purpose of

Improvements in the invention patent No. P 200800991 by: "Osteotomy practice system" Object of the invention

The present invention relates to improvements introduced in the main patent P200800991 by system for the practice of osteotomy. Background of the invention

The system described in the invention patent P200800991 basically comprises a cannulated screw device that is, internally hollow, intended to be introduced into the bone of a patient in the position where the osteotomy is to be carried out and which presents in its side wall one or more longitudinal grooves for the passage of blades associated with a blade holder body mounted in the inner hollow of the cannulated screw device with the possibility of longitudinal displacement.

The blade or blades are mounted on the blade-holder part by means of a rotation axis that allows its folding between an inoperative position in which the said blades remain inside the cannulated screw and an operative position in which they fold towards the exterior, protruding through the respective longitudinal grooves of the cannulated screw. In said patent, the arrangement of the blades in the operative or protruding position and the longitudinal displacement of the blade holder body is carried out by means of an applicator mounted in a threaded manner in the cannulated screw device and acting on the rear part of the part. Blade and blade holder.

During its longitudinal advance in the operative position each blade makes a straight and guided cut in the bone.

The system described in the main patent also has a spring element mounted in the inner hollow of the cannulated screw device and arranged in front of the knife-holder part, said spring element being responsible for returning the knife-holder part towards the rear area of the screw device and the blasting of the blades towards the inoperative position when the applicator is removed from the inner hollow of the cannulated screw device.

In the aforementioned main patent it was contemplated that both the inner hollow of the cannulated screw device and the knife holder hollow have a circular section.

In the tests carried out, a problem in the use of the system was detected, determined precisely by the aforementioned circular section of the inner hollow of the cannulated screw and of the knife-holder part, since when performing the threaded mounting of the applicator on the cannulated screw device , said applicator frictionally transmits a torque to the knife-holder part, which can rotate uncontrollably inside the hollow of the cannulated screw, causing an angular misalignment or offset between the plane of blades and the grooves of the device screw, which obviously prevents the blades from bending outwards when not facing each other by the grooves, leaving the system temporarily disabled.

In order to solve the problem described above, improvements have been introduced in the main patent system aimed at guaranteeing the assembly of the knife holder in the inner hollow of the cannulated screw device with the possibility of longitudinal displacement but without the possibility of turning, and so that in said mounting position the plane defined by each of the blades is kept permanently facing the groove defined in the cannulated screw device so that the blade can be folded into the outstanding operating position.

For this purpose and in accordance with the invention, the inner hollow of the cannulated screw device and the knife-holder part have a non-circular section and define complementary longitudinal guiding means on the opposite side surfaces that make it impossible to turn the blade-holder part. in the inner recess of the cannulated screw device, said guiding means determining at least one mounting position of the knife-holder part, in which each of the blades is held facing the respective longitudinal groove of the cannulated screw device.

With this feature it is achieved that the knife-holder part can move longitudinally through the inner recess of the cannulated screw device, however preventing it from rotating in the inner recess due to the torque transmitted by the friction of the applicator during the assembly of said threaded applicator in the cannulated screw device.

In an embodiment of the invention, said longitudinal guiding complementary means defined in the inner hollow of the screw and in the blade holder part comprise at least two flat and parallel surfaces, mutually facing and oriented longitudinally.

Additionally, and according to the invention, the screw device comprises at its rear end a removable annular piece, which centrally has a threaded longitudinal hole, smaller in diameter than the inner hole of the screw, for screw mounting of the applicator and its longitudinal introduction into the inner recess of the cannulated screw device.

The de fi nition in the aforementioned annular part of the threaded hole for mounting the applicator greatly simplifies the manufacturing of the system taking into account its small dimensions. Brief description of the drawings

To complement the description that is being made and in order to facilitate the understanding of the characteristics of the invention, a set of drawings is attached to the present specification in which, for illustrative and non-limiting purposes, the following has been represented:

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Figure 1 shows an elevation view of an embodiment of the system for the practice of osteotomy, with the improvements of the invention, partially sectioned by a vertical plane and in which the blade holder has a single blade, represented in an inoperative position.

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Figure 2 shows a view analogous to the previous one, with the blade in an outstanding operating position.

3 EN 2351563A1 4

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Figure 3 shows a top plan view of the system in operational position and sectioned by the vertical plane referenced as A-A 'in Figure 2.

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Figure 4 shows a profile view of the system of the previous sections without sectioning, and in which the exit slot of the blade can be observed frontally.

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Figure 5 shows an exploded elevational view of the system shown in Figure 1 with the improvements of the invention.

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Figure 6 shows an elevation view of a variant embodiment of the system with the improvements of the invention, partially sectioned by a vertical plane, with two parallel blades, represented in operative position.

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Figure 7 shows a top plan view of the knife holder of Figure 6 with the blades in operative position.

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Figure 8 shows an elevation view of the knife holder of Figures 6 and 7, vertically sectioned by the plane of one of the blades and with the two blades in an inoperative position. Preferred Embodiment of the Invention

In the exemplary embodiment shown in the accompanying figures, the osteotomy practice system comprises: - a cannulated screw device (1), - a knife holder part (3), carrier of a single blade (2) in the Figures 1-5, and two blades (2, 2 ') parallel and opposite, in Figures 6 to 8, - an applicator or actuator (5) and, - a spring (6).

The screw device (1) has: an external thread thread (11) for its introduction into the bone to be treated, an internal hole (12) for the assembly of a spring element (6) and the part (3) knife holder with the possibility of longitudinal displacement, a longitudinal groove (13, 13 ') for each of the blades (2, 2') of the piece (3) knife holder, and a rear mouth (14) threaded on the that a removable annular part (4) is mounted, which has a threaded hole (41) of smaller diameter than the inner hole (12) of the screw, for threaded mounting of the applicator (5) and its introduction, in greater or lesser extent, in the inner recess of the cannulated screw device (1).

As can be seen more clearly in Figure 3, the blade holder part (3) and the inner hole

(12) have a non-circular section and define complementary longitudinal guiding means (31, 15) on the opposite lateral surfaces, represented by flat and parallel surfaces, mutually facing and longitudinally oriented, which allow the longitudinal displacement of the carrier piece -knives through the inner hollow (12), but which prevent its rotation inside the mentioned inner hollow (12).

The aforementioned flat surfaces (31, 15) are oriented so that the assembly of the piece (3) can only be carried out in a certain angular position, in which each blade (2, 2 ') faces the respective groove longitudinal (13, 13 ').

Each blade (2, 2 ') is mounted on the knife-holder part by means of a pivot shaft (21, 21') that allows its rotation between an inoperative position, represented in Figures 1 and 7, and a position operational, visible in Figures 2 and 6, on the side protruding from the screw device

(1) through the corresponding slot (13, 13 ’).

Each blade (2, 2 ') has a heel (22, 22') that protrudes from the rear end of the blade holder (3), with a certain inclination, when said blades (2, 2 ') are in the inoperative position.

In turn, the externally threaded applicator (5) is mounted in the threaded hole (41) of the annular part (4), said applicator being introduced to a greater or lesser extent in the inner recess (12) of the screw device ( one).

As seen in Figures 1 and 2, when the applicator begins to be introduced, by threading, into the inner recess (12) of the screw device (1), it initially acts against the heel (22) of the blade (2) causing its abatement on the axis (21) towards an operative position, represented in Figures 2 and 3, in; which the blade protrudes through the groove (13).

As the applicator (5) is introduced to a greater extent in the inner hollow (12) causes the longitudinal advance of the blade holder part (3), the blade being kept in the operative position to make a straight cut in the bone of the patient.

This operation is carried out in the same way when the blade holder part (3) has two blades (13, 13 ’) as can be seen in the figure

6.

The spring element (6) mounted in the inner recess, in front of the blade holder part (3), is responsible for causing the retraction of said part

(3) blade holder as the applicator (5) is removed from the inner hole of the screw device.

Once the nature of the invention has been sufficiently described, as well as an example of a preferred embodiment, it is stated to the appropriate effects that the materials, shape, size and arrangement of the described elements may be modified, as long as this does not imply an alteration. of the essential features of the invention that are claimed below.

5 EN 2351563A1 6

Claims (4)

1. Improvements in the invention patent P200800991 per system for the practice of osteotomy, said system comprising: a cannulated screw device (1) having one or more longitudinal grooves (13, 13 ') for the passage of respective blades ( 2, 2 ') of cut mounted with possibility of abatement in a piece (3) knife-holder housed, with possibility of longitudinal displacement, in the inner hollow (12) of the screw device (1), an applicator (5) mounted threaded into the screw device (1) and responsible for causing the blades to break down (2, 2 ') towards an operative position where they protrude through the respective longitudinal grooves (13, 13') and the advance of the knife holder part (3) through the inner hole (12) of the screw, and a spring (6) acting on the front end of the knife holder part (3) and tends to move it towards the rear end of the device screw (1); characterized in that the inner hollow (12) of the screw device (1) and the blade holder part (3) have a non-circular section and define complementary longitudinal guiding means (15, 31) on the opposite side surfaces that make it impossible to rotation of the piece (3) in the inner hole (12) and determine at least one mounting position of the blade holder part (3), in which each of the blades (2, 2 ') is held facing the respective longitudinal groove (13, 13') of the screw device (1).

2.

Refinements, according to claim 1, characterized in that the complementary means of longitudinal guidance (15, 31), defined in the inner hollow (12) of the screw and in the blade holder part (3), comprise the mutually facing flat and parallel surfaces. and oriented longitudinally.

3.

Improvements, according to any of the preceding claims, characterized in that the screw device (1) comprises at its rear end a removable annular piece (5), which has a threaded hole (51), of smaller diameter than the inner hollow (12 ) of the screw device (1), for threaded mounting of the applicator (5) and its introduction to a greater or lesser extent in the inner recess (12) of the screw device (1).

SPANISH OFFICE OF PATENTS AND BRANDS Application no .: 200803207 SPAIN Date of submission of the application: 04.11.2008 Priority Date: REPORT ON THE STATE OF THE TECHNIQUE 51 Int. Cl.: A61B17 / 16 (01.01.2006) RELEVANT DOCUMENTS

Category

Documents cited Claims Affected

TO

US 2002193799 A1 (CHAPPUIS et al.) 19.12.2002, paragraph [65]; Figures 10-11. 1-2

TO

US 4946461 A (FISCHER) 07.08.1990, column 4, line 57 - column 5, line 23; column 5, lines 38-41; column 6, lines 25-35.46-55; column 7, lines 14-52; Figures 4-6,9-11. one

TO

US 3702611 A (FISHBEIN) 14.11.1972, columns 3-4; Figures 1-6,10-12. one

TO

WO 0160268 A1 (SPINEOLOGY GROUP LLC et al.) 23.08.2001, page 3, line 19 - page 5, line 15; page 8, line 20 - page 10, line 2; figures. one

TO

WO 2007075152 A1 (WARSAW ORTHOPEDIC INC et al.) 05.07.2007, pages 3-13; figures. one

TO

DE 3840466 A1 (LIEKE MICHAEL) 07.06.1990, columns 1-3; figures. one

Category of the documents cited X: of particular relevance Y: of particular relevance combined with other / s of the same category A: reflects the state of the art O: refers to unwritten disclosure P: published between the priority date and the date of priority submission of the application E: previous document, but published after the date of submission of the application

This report has been prepared • for all claims • for claims no:

Date of realization of the report 10.01.2011

Examiner J. Square Prados Page 1/5

REPORT OF THE STATE OF THE TECHNIQUE Minimum documentation sought (classification system followed by classification symbols) A61b Electronic databases consulted during the search (name of the database and, if possible, terms of search used) INVENES, EPODOC, WPI, PAJ, ECLA.  WRITTEN OPINION Date of Written Opinion: 10.01.2011 Declaration

Novelty (Art. 6.1 LP 11/1986)

Claims Claims 1-3 IF NOT

Inventive activity (Art. 8.1 LP11 / 1986)

Claims Claims 1-3 IF NOT

The application is considered to comply with the industrial application requirement. This requirement was evaluated during the formal and technical examination phase of the application (Article 31.2 Law 11/1986).  Opinion Base. This opinion has been made on the basis of the patent application as published.  WRITTEN OPINION 1. Documents considered. The documents belonging to the state of the art taken into consideration for the realization of this opinion are listed below.

Document

Publication or Identification Number publication date

D01

US 2002193799 A1 (CHAPPUIS et al.) 19.12.2002

D02

US 4946461 A (FISCHER) 07.08.1990

D03

US 3702611 A (FISHBEIN) 11/14/1972

D04

WO 0160268 A1 (SPINEOLOGY GROUP LLC et al.) 23.08.2001

D05

WO 2007075152 A1 (WARSAW ORTHOPEDIC INC et al.) 05.07.2007

D06

DE 3840466 A1 (LIEKE MICHAEL) 07.06.1990

2. Statement motivated according to articles 29.6 and 29.7 of the Regulations for the execution of Law 11/1986, of March 20, on Patents on novelty and inventive activity; quotes and explanations in support of this statement The application under study is an addition to the main application P200800991, relating to a system for the practice of osteotomy that basically comprises a hollow screw device, a carrier piece of one or more blades that can be folded inside the screw or deployed outside thereof, an applicator threadedly housed inside the screw and whose advance causes the deployment of the blades attached to the carrier piece, and a spring means at the distal end of the screw. The improvements presented in this addition in relation to the purpose of the main application seek to guarantee the assembly of the knife holder in the inner recess of the cannulated screw device with the possibility of longitudinal displacement but without the possibility of rotation, problem presented in the object of the main application due to the circular section presented by the inner hollow of the cannulated screw and the blade holder. In this request for addition, this problem is solved by giving the previous pieces a non-circular section that defines complementary longitudinal guiding means on the opposing parallel surfaces and at the same time makes it impossible to rotate the knife-holder part inside the interior hollow of the cannulated screw Documents D01 to D06, as discussed with respect to the purpose of the main application, only show the general state of the art and are not considered of particular relevance. Any of these documents refers to similar devices that are basically provided for the realization of a hollow or emptying inside a bone with a wider section inside than on the surface thereof. As the arrangement and structure of these devices is similar to that of the application, they could be used for the practice of an osteotomy (one or more cuts in the bone in order to carry out changes in their position). However, none of these documents anticipates all the characteristics that limit the object of protection of the system of the application under study. Document D01 could be considered the state of the art closest to the technical object defined in the main claim, and refers to a surgical instrument to form a passage within a bone. In this document D01 several embodiments are presented, and in particular the one described between paragraphs 59 to 71 (corresponding to Figures 5 to 14) shares many of the technical characteristics contained in the object defined by the main claim under study. . Specifically, and in relation to the improvements presented in this application for addition and constituting the characterizing part of the main claim, document D01 shows (see paragraph 65, figures 10-11 of document D01) that "the gap inside the screw device (150) and the blade holder part (130) have a non-circular section (substantially flat bottom surface 154) and define complementary longitudinal guiding means on the opposite side surfaces that make it impossible to turn the piece ( 130) in the inner recess (150) and determine at least one mounting position of the knife-holder part, in which each of the blades is held facing the respective longitudinal groove of the screw device ". However, and logically, as with the main application, there are also differences in document D01 in relation to the object of the first claim of this application for addition, such as:

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In D01 the blade is not foldably incorporated in a carrier piece but is attached or part of what in the object of the main claim would be the applicator that advances longitudinally inside the cannulated screw, producing the deployment of the o the blades differently, not by pivoting.

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In D01 there is no spring means inside the distal end of the screw that collaborates in the deployment of the blades and in the folding thereof when the cutting operation is completed.

 WRITTEN OPINION These differential characteristics are not considered obvious to a person skilled in the art, and the possibility of applying the features included in the different state-of-the-art documents to arrive at the invention as evidenced in the first claim is not apparent. Thus, the documents cited only show the general state of the art and are not considered of particular relevance, so that the independent first claim meets the requirements of novelty and inventive activity. Claims 2-3 are dependent on the first claim and delimit additional optional features. As the first general claim, these dependent claims also meet the requirements regarding novelty and inventive activity.