Medical ratchet torque handle

Abstract

The utility model discloses a medical ratchet torque handle belongs to medical instrument technical field. The handle includes handle shell, drive head and ratchet reversing mechanism. Its innovation lies in, and the drive head has integrated quick dismounting mechanism and torque limiting mechanism. Quick dismounting mechanism realizes one-button type quick clamping and release of the screwdriver rod in the four square interfaces through the cooperation of compression spring cover, spring in the cover and steel ball. Torque limiting mechanism sets the critical torque value of the friction clutch assembly slip through the compression of knob adjusting ring pre-tightening spring, realizes accurate torque control. Ratchet reversing mechanism switches the meshing state of the pawl and ratchet gear through the switching of reversing dial piece, realizes bidirectional continuous twisting. The utility model integrates the three major functions of the commonality of ordinary handle, the continuity of ratchet handle and the accuracy of torque handle, solves the problem of needing to frequently change tools in operation, improves the efficiency and operation safety of orthopedics operation.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a ratchet torque handle for tightening bone screws in orthopedic surgery. Background Technology

[0002] In orthopedic surgery, doctors need to precisely screw bone screws into the bone for fixation. This process places extremely high demands on the handle tools. They not only need to be easy and efficient to operate, but also need to precisely control the tightening torque to prevent excessive torque from causing the bone to split or the screw to strip, or insufficient torque from causing the fixation to be insecure.

[0003] Currently, the functions of handles on the market are relatively simple, mainly divided into three categories: ordinary handles, ratchet handles, and torque handles. Ordinary handles require the operator to constantly switch hands to achieve continuous rotation, which is inefficient. Ratchet handles allow continuous rotation in one direction, improving the efficiency of operation in narrow spaces, but generally do not have torque control functions. Torque handles can set and limit the maximum output torque to ensure consistent tightening, but their operation method is usually not as convenient as that of ratchet handles.

[0004] Therefore, in complex surgical procedures, doctors often need to prepare and use multiple tools alternately, which not only disrupts the continuity of the surgery and reduces efficiency, but also increases the possibility of surgical risks due to the limitations of tool functions.

[0005] There is an urgent need for a surgical handle that integrates multiple functions and combines convenience and safety. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a medical ratchet torque handle that innovatively integrates the versatility of a regular handle, the continuity of a ratchet handle, and the precision of a torque handle, aiming to significantly improve surgical efficiency and safety.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A medical ratchet torque handle includes a handle housing, a drive head disposed at the front end of the handle housing, and a ratchet reversing mechanism disposed inside the handle housing for controlling the rotation direction. The drive head integrates a quick-release mechanism and a torque limiting mechanism.

[0009] The quick-release mechanism enables rapid installation and removal of the screwdriver handle. It includes a spring sleeve axially movable and fitted onto the drive head, an inner spring housed within the spring sleeve, and a steel ball that, under the action of the inner spring, partially protrudes from the inner wall of the square interface of the drive head. In its natural state, the steel ball is locked into the annular groove of the screwdriver handle by the thrust of the inner spring; pressing the spring sleeve disengages the steel ball from the annular groove, allowing for quick removal of the screwdriver handle.

[0010] The torque limiting mechanism is used to limit the maximum torque output to the screwdriver handle. It includes a torque adjusting ring threaded to the handle housing, a preload spring connected to the torque adjusting ring, and a friction clutch assembly pressed by the preload spring. Rotating the torque adjusting ring changes the compression of the preload spring, thereby adjusting the slippage threshold of the friction clutch assembly and achieving stepless torque setting.

[0011] Furthermore, the friction clutch assembly includes a driving friction plate and a driven friction plate that are in contact with each other. The driving friction plate is linked to the output end of the ratchet reversing mechanism, and the driven friction plate is linked to the body of the driving head.

[0012] Furthermore, the ratchet reversing mechanism includes a ratchet gear, two symmetrically arranged pawls that mesh with the ratchet gear, and a reversing paddle for selectively engaging one of the pawls with the ratchet gear. The driving direction of the handle can be easily switched by moving the reversing paddle.

[0013] Furthermore, a limiting pin is provided between the compression spring sleeve and the drive head to restrict its axial movement stroke, preventing the compression spring sleeve from falling off during operation.

[0014] Furthermore, the handle housing is provided with a scale corresponding to the torque adjustment ring for indicating the torque magnitude, which facilitates precise setting by the doctor.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This invention integrates three core functions—quick assembly / disassembly, a two-way ratchet, and precise torque control—into a single handle, making it multifunctional and greatly simplifying the surgical instrument preparation process and improving surgical efficiency.

[0017] The screwdriver handle of this invention can be replaced with one click, saving time and effort. The two-way ratchet mechanism allows doctors to apply force continuously without switching hands in a narrow surgical field, greatly improving the smoothness of operation.

[0018] This invention can preset and limit torque, effectively avoiding improper screw tightening force caused by differences in human perception, fundamentally reducing surgical risks and improving fixation reliability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a cross-sectional schematic diagram of the drive head and ratchet reversing mechanism of this utility model;

[0021] Figure 3 This is a cross-sectional schematic diagram of the drive head of this utility model;

[0022] Figure 4 This is a cross-sectional schematic diagram of the ratchet reversing mechanism of this utility model.

[0023] In the diagram: 1. Handle housing; 2. Drive head; 201. Square interface; 202. Compression spring sleeve; 203. Inner spring; 204. Steel column; 205. Torque adjusting ring; 206. Preload spring; 207. Drive friction plate; 208. Driven friction plate; 209. Limit pin; 3. Ratchet reversing mechanism; 301. Ratchet gear; 302. Pad; 303. Reversing lever. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1

[0026] like Figures 1-4 As shown, a medical ratchet torque handle includes a handle housing, a drive head disposed at the front end of the handle housing, and a ratchet reversing mechanism disposed inside the handle housing for controlling the rotation direction. The drive head integrates a quick-release mechanism and a torque limiting mechanism. The quick-release mechanism enables rapid installation and removal of the screwdriver handle and includes a compression spring sleeve axially movable on the drive head, an inner spring housed within the compression spring sleeve, and a steel ball that, under the action of the inner spring, partially protrudes from the inner wall of the square interface of the drive head. In its natural state, the steel ball is locked into the annular groove of the screwdriver handle by the push force of the inner spring; pressing the compression spring sleeve disengages the steel ball from the annular groove, thereby quickly removing the screwdriver handle.

[0027] The torque limiting mechanism limits the maximum torque output to the screwdriver handle. It includes a torque adjusting ring threaded onto the handle housing, a preload spring connected to the torque adjusting ring, and a friction clutch assembly pressed by the preload spring. Rotating the torque adjusting ring changes the compression of the preload spring, thereby adjusting the slippage threshold of the friction clutch assembly and achieving stepless torque setting. The friction clutch assembly includes a driving friction plate and a driven friction plate that fit together. The driving friction plate is linked to the output end of the ratchet reversing mechanism, and the driven friction plate is linked to the body of the drive head. The ratchet reversing mechanism includes a ratchet gear, two symmetrically arranged pawls that mesh with the ratchet gear, and a reversing paddle for selectively engaging one of the pawls with the ratchet gear. By moving the reversing paddle, the drive direction of the handle can be easily switched.

[0028] A limiting pin is provided between the compression spring sleeve and the drive head to restrict its axial movement stroke, preventing the compression spring sleeve from falling off during operation. The handle housing is provided with a scale corresponding to the torque adjustment ring to indicate the torque magnitude, which facilitates precise setting by the doctor.

[0029] Working principle:

[0030] During operation, the front end of the drive head is machined with a standard square interface. The screwdriver handle is inserted into the handle, and the quick-release mechanism is installed here. The compression spring sleeve restricts its axial movement range through a limiting pin. The inner spring is placed inside the compression spring sleeve, continuously applying a forward force to the compression spring sleeve. This force is transmitted to the steel ball, causing the steel ball to partially protrude from the side wall groove of the square interface in its natural state, thereby locking the neck groove of the screwdriver handle. When changing the screwdriver handle, simply press the compression spring sleeve backward to allow the steel ball to retract into the groove, and the screwdriver handle can be easily removed.

[0031] The torque limiting mechanism is also integrated inside the drive head. The torque adjusting ring is connected to the handle housing via a precision thread. Rotating the torque adjusting ring allows it to move axially, thereby changing the compression of the preload spring. The preload spring then presses against the friction clutch assembly, which consists of a drive friction plate and a driven friction plate. The drive friction plate rotates synchronously with the ratchet gear, while the driven friction plate is fixed to the drive head. When the output torque exceeds the preset value, relative sliding occurs between the drive friction plate and the driven friction plate, cutting off the torque transmission. This is usually accompanied by a "click" sound, providing tactile and auditory feedback.

[0032] The core of the ratchet reversing mechanism is the ratchet gear. Two symmetrical pawls are always in contact with the ratchet gear through ratchet springs. The reversing paddle can rotate around the axis. Its design allows only one pawl to be pushed to fully engage with the ratchet gear for effective driving at any position, while the other pawl is lifted and slides freely. By moving the reversing paddle, the effective driving direction of the handle can be quickly switched.

[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A medical ratchet torque handle, comprising a handle housing (1), a drive head (2) disposed at the front end of the handle housing (1), and a ratchet reversing mechanism (3) disposed inside the handle housing (1) for controlling the rotation direction, characterized in that, The drive head (2) integrates a quick-installation mechanism for quickly installing and removing the screwdriver rod, and also integrates a torque limiting mechanism for limiting the maximum torque output to the screwdriver rod.

2. The medical ratchet torque handle according to claim 1, characterized in that, The quick assembly / disassembly mechanism includes a compression spring sleeve (202) that is axially movable and sleeved on the drive head (2), an inner spring (203) housed in the compression spring sleeve (202), and a steel ball (204) that can partially protrude from the inner wall of the square interface (201) of the drive head (2) under the action of the inner spring (203).

3. A medical ratchet torque handle according to claim 1, characterized in that, The torque limiting mechanism includes a torque adjusting ring (205) threadedly connected to the handle housing (1), a preload spring (206) connected to the torque adjusting ring (205), and a friction clutch assembly pressed by the preload spring (206).

4. A medical ratchet torque handle according to claim 3, characterized in that, The friction clutch assembly includes a driving friction plate (207) and a driven friction plate (208) that are in contact with each other. The driving friction plate (207) is linked to the output end of the ratchet reversing mechanism (3), and the driven friction plate (208) is linked to the body of the driving head (2).

5. A medical ratchet torque handle according to claim 1, characterized in that, The ratchet reversing mechanism (3) includes a ratchet gear (301), two pawls (302) symmetrically arranged and cooperating with the ratchet gear (301), and a reversing paddle (303) for selectively engaging one of the pawls (302) with the ratchet gear (301).

6. A medical ratchet torque handle according to claim 2, characterized in that, A limiting pin (209) is provided between the compression spring sleeve (202) and the drive head (2) to limit its axial movement stroke.

7. A medical ratchet torque handle according to claim 3, characterized in that, The handle housing (1) is provided with a scale corresponding to the torque adjustment ring (205) for indicating the magnitude of torque.

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