Bibliographic Details
| Title: |
Clip-type surgical instrument for spinal implant |
| Document Number: |
20050119667 |
| Publication Date: |
June 2, 2005 |
| Appl. No: |
10/898320 |
| Application Filed: |
July 26, 2004 |
| Abstract: |
The surgical instrument according to the present invention comprises a main body (101) comprising a horizontal tube (102) extending by a frame (103) that is formed as an integral unit with a fixed handle (104), a movable handle (105) acting on a driving device (108) guided within the frame (103) and allowing, according to the pressure force applied on the movable handle (105), firstly the immobilization of the surgical instrument (100) on the head (8) of the bone anchoring element (2) and secondly the introduction under the pushing force F of an immobilizing element (104), previously positioned and guided within the tube (102), in the head (8) of the bone anchoring element (2). |
| Inventors: |
Leport, Tiphaine (Lille, FR); Leroy, Jean-Yves (Campagne Les Hesdin, FR); Viart, Guy (Saint-Leger, FR); Rokegem, Pascal (Arras, FR) |
| Assignees: |
EUROSURGICAL SA (BEAURAINS, FR) |
| Claim: |
1. A surgical instrument for positioning an immobilizing element (4) in the U-shaped head (8) of a bone anchoring element (2) of a spinal implant (1) for fixing in rotation and in translation a connecting rod (3), characterized in that the instrument comprises a main body (101) comprising a horizontal tube (102) extended by a frame (103) that is formed as an integral unit with a fixed handle (104), a movable handle (105) acting on a driving device (108) guided within the frame (103) and allowing according to the pressure force applied on the movable handle (105) firstly the immobilization of the surgical instrument (100) on the head (8) of the bone anchoring element (2) and secondly the introduction under a pushing force F of an immobilizing element (104), previously positioned and guided within the tube (102), in the head (8) of the bone anchoring element (2). |
| Claim: |
2. The surgical instrument according to claim 1, characterized in that the movable handle (105) cooperates with the fixed handle (104) through an axis of rotation (106) and a laminated spring (107) allowing the driving device (108) to be activated under a pressure force and to return to its position of rest following release of the pressure force. |
| Claim: |
3. The surgical instrument according to claim 2, characterized in that the movable handle (105) comprises above the axis of rotation (106) a head (109) presenting a domed profile (110) from which extends a fork (111) wherein each branch (112) comprises a rounded profile free extremity (113). |
| Claim: |
4. The surgical instrument according to claim 1, characterized in that the frame (103) is comprised of two walls, i.e., a vertical wall and an opposite wall (114, 115) interconnected by upper (116) and lower (117) perforated walls, said vertical wall (114) being formed as an integral unit with the horizontal tube (102) presenting an internal bore (118) opening within the frame (103), while the opposite wall (116) is pierced by a hole (119) carried by the same main axes as that of the internal bore (118), said upper wall (116) presenting a central rectangular-shaped recess (120) and an extension (123) extending beyond the vertical wall (115) and in which an oblong groove (124) is pierced, while the lower wall (117) comprises another recess (121) disposed below that (120), said recess (121) comprising at the fixed handle (104) internal shoulders (122) designed to form a stop. |
| Claim: |
5. The surgical instrument according to claim 1, characterized in that the instrument comprises a locking tube (125) comprising at one of its extremities branches (127) in the shape of a fork each provided with notches (126) so that the free extremities (113) of each branch (112) of the movable handle (105) respectively cooperate with said notches (126) to allow under the action of the movable handle (105) the sliding of the locking tube (125) around the tube (102) and at the opposite extremity a cylindrical sleeve (128) extended by the parallel tabs (129). |
| Claim: |
6. The surgical instrument according to claim 1, characterized in that the instrument comprises a cylindrical plunger (130) that crosses the frame (103) through the hole (119) provided in the vertical wall (115) to slide in the internal bore (118) of the tube (102). |
| Claim: |
7. The surgical instrument according to claim 1, characterized in that the driving device (108) is comprised of a first plate (131) elastically loaded by a spring (132) and disposed within the frame (103) so as to cooperate with the recesses (120, 121) of the upper (116) and lower (117) walls and the cylindrical plunger (130) and of a second plate (133) elastically loaded by a spring (134) and disposed within the groove (124) of the extension (123) of the upper wall (116) so as to cooperate with the cylindrical plunger (130), said first plate (131) being provided to push, under the effect of the spring (132), against the domed profile (110) of the head (109) of the movable handle (105) allowing during activation of the latter the displacement in translation of the cylindrical plunger (130) within the tube (102) due to the straight position of the first plate (131). |
| Claim: |
8. The surgical instrument according to claim 1, characterized in that the tube (102) comprises in the extension of the cylindrical internal bore (118) and at its free extremity another internal bore (135) wherein the internal profile is complementary to the external profile of the immobilizing element (4) in order to be able to receive and guide the latter before its introduction in the head (8) of the bone anchoring element (2). |
| Claim: |
9. The surgical instrument according to claim 8, characterized in that the cylindrical tube (102) is extended at its free extremity by a sleeve (138) with a roughly rectangular profile wherein each parallel and opposite wall (139) comprises a U-shaped cutout (140) designed to cooperate with the connection rod (3) of the spinal implant (1). |
| Claim: |
10. The surgical instrument according to claim 9, characterized in that the internal profile of the sleeve (138) is measured in dimensions slightly larger than those of the internal bore (135) in order to conform the shoulders (151) forming a stop to the input of the bore. |
| Claim: |
11. The surgical instrument according to claim 10, characterized in that the cylindrical tube (102) comprises on its external profile flat parts (141) that are extended on each wall (142) of the sleeve (138), each flat part (141) being pierced at the tube (102) of the first and second holes (143, 144) opening within the bore (135) and at the walls (142) of the sleeve (138) of a third hole opening (145). |
| Claim: |
12. The surgical instrument according to claim 11, characterized in that each first hole (143) presents an internal threading allowing the hole to cooperate with a tightening screw (146) for fixing two elastic strips (147, 148) in each flat part (141). |
| Claim: |
13. The surgical instrument according to claim 12, characterized in that each elastic strip (147) is formed as an integral unit with a pin (149) cooperating with the corresponding second hole (144) and within the bore (135) to allow the immobilizing elements (4) to be held within the bore. |
| Claim: |
14. The surgical instrument according to claim 12, characterized in that each elastic strip (148) is formed as an integral unit with a pin (150) cooperating with the third hole (145) of the sleeve (138) in order to be able to penetrate within the latter when the strips (148) are deformed by an external pushing force coming from the tabs (129) of the of the locking tube (125) in order to allow the surgical instrument (100) to be fixed on the head (8) of the bone anchoring element (2). |
| Claim: |
15. The surgical instrument according to claim 8, characterized in that the internal bore (135) of the tube (102) is provided to receive a certain number of immobilizing elements (4). |
| Current U.S. Class: |
606104/000 |
| Accession Number: |
edspap.20050119667 |
| Database: |
USPTO Patent Applications |
