JP2003265492A - Operation tool for implant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operation tool correctly and smoothly allowing operation, and removal after completion of operation. <P>SOLUTION: This operation tool is shaped like a rod as a whole, and it comprises an engagement rod 20 having an engagement part 21 for engagement with a screw 11 at a tip, and a sheath 26 in the form of a tube as a whole in which the engagement lever 20 can be inserted, having a female thread part 19 engageable with the screw 11 at a tip. The engagement rod 20 and the sheath 26 are combined with each other to have such a play that makes protruded quantity of the engagement part 21 at the tip from a tip part of the sheath 26 changeable. A base end part of the engagement rod 20 is protruded from the base end part of the sheath 26. Grip parts 22 and 27 are provided on this base end part and the base end part of the engagement rod 20. Both of the grip parts 22 and 27 can be simultaneously operated by one hand. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an implant attached to a bone and an operating tool for handling a screw used therein.

[0002]

2. Description of the Related Art For example, a surgical operation is performed by placing a rod along the spinal column in order to keep the spinal column in a desired shape. In this case, an implant called a pedicle screw or the like is erected by screwing into a bone element that constitutes the spinal column,
Attach rods to multiple implants using connectors. Therefore, in this operation, it is necessary to accurately carry, fit, and tighten parts such as implants, setscrews, and connectors to a desired location.

Conventionally, forceps and drivers of various sizes have been used for that purpose, but since it was too inconvenient, the inventor of the present case developed a dedicated operating instrument and applied for a patent for the result. . The invention includes an engagement rod having an engagement portion for engagement with a set screw at the tip, and a sleeve having a tubular shape through which the engagement rod can be inserted and having a female screw portion at the tip that can be engaged with the set screw. In combination, the set screw is operated by the handle provided at the base end of the engagement rod.

Therefore, when the handle is rotated while the tip engaging portion of the engaging rod is engaged with the engaging counterpart portion of the set screw, the set screw is screwed in the trocar and the female thread of the implant. become. As a result, the sleeve and the implant are tightened by the set screw by the rotation of the engagement rod, and the lock nut is just tightened. In that case, it is very difficult to remove the sleeve from the set screw. If such a situation occurs during surgery, it may hinder the smooth progress of the surgery. Further, it has been pointed out that during operation, blood is introduced into the operation instrument and coagulates, so that cleaning and sterilization are necessary.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is to enable an operation by an operating tool and a removal after the operation to be performed accurately and smoothly. Is. Another object of the present invention is to provide an implant operating tool that can be easily cleaned and sterilized.

[0006]

In order to solve the above-mentioned problems, the present invention relates to an implant operating tool, which is entirely rod-shaped and has an engaging portion for engaging with a screw at its tip. The rod and the whole are tubular in which the engagement rod can be inserted, and have a sleeve having a female threaded portion at the tip that can be screwed with a screw.The engagement rod and the sleeve have a engagement portion at the tip. It is combined with play that allows the amount of protrusion from the tip of the pipe to be variable, and the base end of the engagement rod is in a relationship of protruding from the base end of the sleeve, and the base end and the base end of the engagement rod are gripped. A part is provided, and both grip parts can be operated simultaneously with one hand.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An implant operating instrument according to the present invention is an instrument for handling an implant attached to a bone, a set screw used for the implant, and the like. The operating tool of the present invention enables the screw itself to be handled accurately, that is, the screw and the like to be firmly held by engagement and screwing and to be smoothly separated from the held screw. This facilitates and secures the handling of the screws and the implants used therewith and the various components associated therewith.

The operating instrument of the present invention has two parts, an engaging rod which is rod-shaped as a whole, and a sleeve tube which is entirely tubular for inserting the engaging rod. The engagement rod is inserted into the sleeve, the tip side is applied to the mating screw, and the base side is operated. The sleeve and the engagement rod can move relative to each other around the axis and in the axial direction.

The engagement rod has an engagement portion at the tip for engaging with the engagement partner portion on the screw side. The form of the contract is
Determined in relation to the set screw side. For example, in the case of a socket head screw, a hexagonal socket and key, a square socket and key, or a plus (+) type and a minus (-) type.
It is composed of a combination of a groove that is cut into a shape and a tip that fits into it.

The engagement rod and the sleeve tube are combined with each other in such a manner that the engagement portion at the distal end projects to a certain extent from the distal end portion of the sleeve tube, and the amount of projection is variably adjustable. This play can be provided in the retaining portion provided between the engagement rod and the sleeve to prevent the engagement rod from slipping out, and at least one pitch of the set screw and the female screw must be secured. Is required, but the upper limit may be larger. However, when the engagement rod is retracted, the engagement portion at the tip may be recessed inward from the tip of the sleeve.

Further, the base end of the engagement rod is assumed to extend from the base end of the sleeve, and a grip portion is provided on each of the base end of the sleeve and the base of the engagement rod. The part can be operated with one hand and at the same time. It suffices that the grip portion necessary for operating the operating instrument of the present invention is bulged in a head shape so that it can be easily picked. The degree of the bulge determines the magnitude of the torque applied to the engagement rod and the sleeve during operation. The bulges, that is, the diameters, of the two grip portions may be the same or different, but if they are different, it is desirable that the grip of the engagement rod has a smaller diameter than the grip portion of the sleeve.

Further, according to the present invention, a sleeve which can be inserted into the outer side of the sleeve can be combined. The sleeve is rotatable in a position slid toward the distal end, so that it is possible to prevent the human body tissue from being caught in the sleeve when the sleeve and the engaging rod are operated and held. The sleeve is movable in the direction of pulling out toward the tip of the sleeve, and at the limit of its movement, the male thread portion of the sleeve and the female thread portion of the sleeve are screwed together. On the other hand, the sleeve can be removed after screwing.

Further, the engagement rod is movable in the direction of withdrawing to the base end side of the sleeve, that is, it has a play, and at the limit of movement, the threaded portion of the engagement rod and the female threaded portion of the sleeve are separated. Is ready for screwing. It is a movable range until the screwed state, and the engagement rod can be removed from the sleeve after screwing.

By using the operating device for implants of the present invention, the engagement part of the engagement rod tip is engaged with the engagement partner part of the screw, and the female thread portion of the tip is one or more screw threads of the set screw. Can be screwed onto. As a result, the screw and the screwed implant can be held by the operating tool, carried to a desired location, and necessary operations such as screwing can be performed.

[0015]

EXAMPLE FIG. 1 shows an example of an operating tool for implant 10 according to the present invention. In FIG. 1, the set screw 11 is
It is shown as a socket head screw and has a polygonal receiving hole 12 as a mating mating portion at the base end and an external thread portion 13 having several threads on the outer periphery (FIG. 3).
reference). Further, the implant 15 has a male screw portion 16 that can be screwed into a bone element that constitutes the spinal column, and has a screw head portion,
It has a female thread portion 17 with which the set screw 11 can be screwed (see FIGS. 3 and 4).

As shown in the drawings, the operating device 10 of the present invention has an engaging rod 20 having a straight rod shape as a whole, and a receiving hole 12 of a set screw 11 is engaged at the tip of the engaging rod 20. An engagement portion 21 that is a mating portion is formed. Contract part 21
Is longer than the depth of the receiving hole 12 of the set screw 11. Further, a grip portion 22 is provided at the base end of the engagement rod 20 so that the engagement rod 20 can be operated with a necessary and sufficient torque. The grip portion 22 has a rounded end portion 23 that is pressed against the palm of one hand when the present apparatus is operated with one hand, and an uneven shape 24 suitable for torque transmission.

The engagement rod 20 is further movable in the direction of withdrawing to the base end side of the sleeve tube 26, which will be described below, and
In the vicinity of the movement limit, there is an external thread 25 of the engagement rod that can be screwed into the internal thread 29 of the sleeve. In the embodiment, the engagement rod 2
When 0 is moved in the direction of pulling out, the engagement portion 21 at the tip thereof is set back after being retracted in the direction of the tip portion of the sleeve tube 26, and then the screwing state with the female thread portion 29 of the sleeve tube starts ( 2 (a)).

The sleeve 26 has a tubular shape as a whole, and the engagement rod 20 can be inserted therein. At the tip of the sleeve 26, an internal thread portion 19 of the sleeve capable of being screwed with the male screw portion 13 of the set screw.
Is formed, and the length thereof is set to be approximately the same as the length of the set screw 11 in the embodiment. A grip portion 27 is provided at the base end of the sleeve 26 so that the sleeve 26 can be operated with a necessary and sufficient torque.
The grip portion 27 also has an uneven shape 28 that allows the fingertip to be properly handled when the device 10 is operated with one hand.
Is provided. In the embodiment, this grip portion 27
Has the same diameter as the grip portion 22 of the engagement rod 20. The sleeve 26 is further formed with an internal thread portion 29 of the sleeve which can be screwed into the thread portion 26 of the engagement rod.

On the outer side of the sleeve 26, a sleeve 3 is further provided.
0 is rotatably and slidably combined.
Since the sleeve 30 is rotatable, it is possible to prevent the human body tissue from being entangled with the sleeve 30 when the sleeve 26 and the engagement rod 20 are operated during screw operation and when the sleeve 30 is operated. The sleeve 30 can be pulled out toward the distal end side of the sleeve 26, and at the limit of movement in the pulling direction, the male thread portion 31 of the sleeve and the female thread portion 32 of the sleeve are in a screwable state, and the screwing After that, the sleeve 30 can be removed.

In the case of the embodiment, when the male thread portion 31 of the sleeve and the female thread portion 32 of the sleeve start to be screwed, the tip of the sleeve 30 is located in front of the tip of the sleeve 26, and the screw is in the middle of screwing. Over the tip of the sleeve 26, and when screwing is complete, the sleeve 2
It comes out before the tip of 6. In each figure, 33 and 34 indicate assembling screws.

Next, a method of using the implant operating tool 10 according to the present invention will be described. As shown in FIG. 3A, the engagement portion 21 is engaged with the receiving hole 12 of the set screw 11, and then the grip portion 27 is rotated while fixing the engagement rod 20 to stop the female screw portion 19 of the sleeve. The external thread portion 13 of the screw is screwed (FIG. 3 (b)). In this threaded engagement of the present invention, the set screw 11 includes the implant 15 and the cannula 26.
The set screw 11 and the sleeve 2 are not moved by screwing the internal thread portions 17 and 19 but only by rotating the sleeve 26.
Since the screwing with 6 progresses, the lock nut effect unlike the conventional case does not occur.

In FIG. 3C, the sleeve 26 is threaded on the set screw 11 so that the tip of the sleeve 26 contacts the head end surface of the implant 15, and the implant 15 operates according to the present invention via the set screw 11. The state integrated with the instrument 10 is shown. Therefore,
In this state, the implant 15 can be carried to the target location of the bone element 35 forming the spinal column and implanted there (FIG. 3 (c)). When planting,
The set screw 11 and the engagement rod 20 follow each other only by rotating the sleeve 26. According to the present invention, the grip portion 22 of the engagement rod 20 and the grip portion 27 of the sleeve 26 can be simultaneously grasped by one hand and handled as one body, so that the operation is easy and reliable (FIG. 3 (d)).

FIG. 4 shows that after implanting an implant 15 using the operating tool 10 of the present invention, the operating tool 10 is then installed.
It shows the process of removing. In order to remove the operating device 10, the engagement rod 20 may be fixed and the sleeve 26 may be rotated in the reverse direction. Since the lock nut effect is not produced in the present invention, smooth work can be performed here as well.

FIG. 5 shows a process of attaching the rod 36 to the implanted implant 15 using the operating tool 10 of the present invention. In this case, the set screw 11 is screwed with respect to the rod 36 arranged in the rod receiving portion 37 of the implant 15. This operation is the engagement rod 2
5 is tightening of the set screw 11 with respect to the rod 36 by torque transmission to the set screw 11 by 0 (FIG. 5 (a). The set screw 11 is screwed into the female thread portion 17 of the implant 15 to set the trocar. It comes to be unscrewed from the screw portion 19, but the operation instrument 10 is detached from the screwed portion by the procedure described with reference to FIG. 4.

After being actually used for surgery, blood remains in the sleeve and sleeve, and coagulates if left to stand. The operating device 10 of the present invention includes a threaded portion 25 of the engagement rod.
And the female thread portion 29 of the sleeve, and the male thread portion 3 of the sleeve.
1 can be easily disassembled by removing the screwing between the female thread portion 32 of the sleeve and the state shown in FIG. Therefore, operations such as washing and sterilization can be easily performed.

[0026]

EFFECTS OF THE INVENTION Since the present invention is configured and operates as described above, it is possible to perform work such as tightening and removing screws by operating tools, implanting implants, assembling rods, and removing work after the operation is completed. In addition to the effect that it can be performed accurately and smoothly, it is possible to perform maintenance after use without leakage due to easy disassembly.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of an operating device for implants according to the present invention.

FIG. 2 (a) is a vertical sectional view of the same. (B) Similarly, the BB line cutting part enlarged end view.

FIG. 3A is a sectional view for explaining the engagement. (B) A sectional view of a state in which a set screw is screwed. (C) Sectional drawing which arrange | positions the implant integrated with the instrument of this invention in a target location. (D) A cross-sectional view of a state in which an implant is also implanted.

FIG. 4A is a cross-sectional view showing a state where the device of the present invention is removed from the set screw. (B) Similarly, a sectional view after separation.

FIG. 5 (a) is a sectional view showing a state in which a rod is attached to an implant. (B) A sectional view of a state just before the end of the work.

[Explanation of symbols]

10 Instrument for implant 11 screw (set screw) 13 Male thread 15 implants 19 Female thread of sleeve 20 Contract rod 21 Contract Department 22, 27 Grip part 25 Threaded part of engagement rod 26 trocar 29 Female thread of sleeve 30 sleeves 31 Male thread of sleeve 32 Female thread of sleeve

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Isao Suzuki             Furukawaga 1-27-3 Nishigahara, Kita-ku, Tokyo             -Den Mansion 1102 Rober Co., Ltd.             Toreed Chamber F-term (reference) 4C060 LL13 MM24

Claims (5)

[Claims] 1. An operating instrument for handling an implant to be attached to a bone and a screw used for the implant, which has a rod-like shape as a whole and has an engagement portion for engaging with a screw at a distal end thereof, and an engagement rod as a whole. , A tubular shape through which the engaging rod can be inserted, and has a sleeve having a female threaded portion capable of screwing with a screw at the tip, and the engaging rod and the sleeve have the engaging portion at the tip from the tip of the sleeve. Combined with play that allows the amount of protrusion to be variable, and the proximal end of the engagement rod is in a relationship of protruding from the proximal end of the sleeve,
An operating instrument for implants, characterized in that a grip portion is provided on the base end portion and the base end portion of the engagement rod, and both grip portions can be operated simultaneously by one hand. 2. The grip portion of the engagement rod and the grip portion of the trocar are set in the palm of one hand, and the grip portion of the trocar is grasped and held while the grip portion of the engagement rod is pressed against the palm. The operating tool for implant according to claim 1, which has a size and a shape suitable for the above. 3. A sleeve, which can be inserted into the outer side of the sleeve, is combined, and the sleeve is slidable and rotatable at least in the distal direction, so that the sleeve and the engagement rod can be held and operated when operating. The operating instrument for implant according to claim 1 or 2, which is capable of preventing entrainment of surrounding human body tissue. 4. The sleeve is movable in a direction of pulling out to the tip side of the sleeve, and at the limit of movement, the male thread portion of the sleeve and the female thread portion of the sleeve are in a screwable state, and the screw The operating tool for implants according to any one of claims 1 to 3, which is configured so that the sleeve can be removed after joining. 5. The engagement rod is movable in the direction of pulling out to the base end side of the sleeve, and at the limit of movement, the threaded portion of the engagement rod and the internal thread of the sleeve are screwed together. The implant operating tool according to any one of claims 1 to 4, wherein the engaging rod can be removed after the screwing.