Head structure of spreader

Abstract

The utility model discloses a head structure of a spreader. The head structure comprises a center rod, a rear blade, a front blade, an outer pipe, a handle, a rotating wheel, a fixing pin and a pin shaft. The rotating wheel is arranged at the tail end of the handle; the handle is fixedly provided with an outer tube; the center rod sequentially penetrates through the outer pipe and an inner cavity of the handle to be connected with the rotating wheel, and the rotating wheel is rotated to drive the center rod to stretch out and draw back. A pair of front blades is mounted at the front end of the center rod through a pin shaft; the front end of the outer pipe is connected with a pair of rear blades through a fixing pin; and the rear blade is connected with the front blade through a pin shaft. The center rod is controlled to stretch out and draw back through rotation of the rotating wheel, the rear blade and the front blade are driven to be opened and closed, all parts are connected through the pin shafts, and the strength of the instrument and the operation stability are improved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a head structure of a spreader. Background Technology

[0002] Retractors are widely used medical devices in the medical field. They are used to expand the surgical field and space by opening up tissues and organs. Most retractors on the market are fan-shaped with no connecting points at the front end. They are prone to bending when supporting heavy organs, which can affect the surgical process and increase surgical risks. Utility Model Content

[0003] To address the aforementioned issues, this invention provides a head structure for a spreader that offers high support strength and is less prone to deformation during support.

[0004] The technical solution of this utility model is as follows: a head structure of a spreader, including a central rod, a rear blade, a front blade, an outer tube, a handle, a rotating wheel, a fixing pin, and a pin shaft; the rotating wheel is disposed at the tail end of the handle; the handle is fixedly provided with an outer tube; the central rod passes through the inner cavity of the outer tube and the handle in sequence and is connected to the rotating wheel, rotating the rotating wheel drives the central rod to extend and retract; a pair of front blades are installed at the front end of the central rod through a pin shaft; a pair of rear blades are connected at the front end of the outer tube through a fixing pin; the rear blades and the front blades are connected by a pin shaft.

[0005] Furthermore, the rear blade and the front blade form two spreading arms via a pin, and the extension and retraction of the central rod drives them to open or close; the two spreading arms are located above and below the central rod, respectively.

[0006] Furthermore, a central rod groove is provided on the central rod; the fixing pin moves along the central rod groove.

[0007] Furthermore, the outer tube includes a tubular structure at the rear; a connecting arm is provided at the front end of the tubular structure for connecting with the rear blade, and the gap between the connecting arms is used to allow the rear blade to move when it is opened.

[0008] Furthermore, it also includes an upper limit position and a lower limit position; the upper and lower limits are respectively provided on the upper and lower surfaces of the central rod; and an inclined surface is provided on the rear blade.

[0009] The beneficial effects of this utility model are as follows:

[0010] This invention controls the extension and retraction of the central rod by rotating a wheel, which in turn drives the opening and closing of the rear and front blades. All parts are connected by pins, which increases the strength of the instrument and the stability of its operation.

[0011] The cross-shaped support arm design formed by the front and rear blades of this invention allows the blade volume to be maximized within a limited space, thereby improving the overall structural strength.

[0012] The fixing pin of this invention moves smoothly in the central rod groove, limiting the maximum and minimum movement distance, so that the opening angle of the instrument is within a controllable range, and the instrument will not fail when the angle is too large.

[0013] By setting upper and lower limits and an inclined surface on the rear blade, the rear and front blades move only on one side, preventing them from folding over. The same principle applies when opening, allowing the blades to unfold only on one side. Due to the limiting effect, they will not open in the opposite direction. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram showing the expander in its fully closed state.

[0017] Figure 3 This is a schematic diagram showing the spreader in a semi-open, semi-closed state.

[0018] Figure 4 Schematic diagram for center rod limiting Detailed Implementation

[0019] The technical solution of this utility model will be clearly and completely described below through specific embodiments.

[0020] The head structure of a spreader according to this embodiment includes a central rod 1, a rear blade 2, a front blade 3, an outer tube 4, a handle 5, a rotating wheel 6, a fixing pin 8, and a pin shaft 9.

[0021] like Figure 1 As shown, the rotating wheel 6 is located at the tail end of the handle 5; the handle 5 is fixedly equipped with an outer tube 4; the central rod 1 passes through the outer tube 4 and the inner cavity of the handle 5 in sequence and is connected to the rotating wheel 6. Rotating the rotating wheel 6 causes the central rod 1 to extend and retract; a pair of front blades 3 are installed at the front end of the central rod 1 through a pin 9; a pair of rear blades 2 are connected at the front end of the outer tube 4 through a fixing pin 8; the rear blades 2 and the front blades 3 are connected through the pin 9.

[0022] The extension and retraction of the central rod drives the opening and closing of the two rear blades and the three front blades. All parts are connected by pins, which increases the strength of the instrument and the stability of operation.

[0023] The center rod is slidably connected to the handle 5 and screwed to the screw sleeve at the front end of the rotating wheel 6. Rotation drives the center rod to move, controlling the extension and retraction of the center rod.

[0024] Figure 2 The diagram shows the retractor in its fully closed state. When using the instrument, it must be closed before being inserted into the body through the compatible trocar. After use, the trocar is withdrawn in the state shown in the diagram. The rear blade 2 and the front blade 3 form two retractor arms through the pin 9. The central rod 1 extends and retracts to open or close the retractor. As shown in the diagram, after the rear blade 2 and the front blade 3 on one side are closed, they are located above the central rod 1. After the rear blade 2 and the front blade 3 on the other side are closed, they are located below the central rod 1. The cross design also allows the instrument to maximize the blade volume within a limited space, thereby improving the overall structural strength.

[0025] Figure 3 This is a schematic diagram of the expander in a half-open, half-closed state. 1 is the central rod, 2 is the rear blade, 3 is the front blade, 7 is the groove of the central rod, 8 is the fixing pin, and 9 is the pin shaft. When the central rod (1) extends and retracts, the groove of the central rod (7) moves smoothly under the restriction of the fixing pin (8), limiting the maximum and minimum movement distance, so that the opening angle of the device is within a controllable range and the device will not fail when the angle is too large.

[0026] Figure 4 The diagram shows the center rod limit. 1 is the center rod, 2 is the rear blade, 3 is the front blade, 10 is the upper limit, 11 is the lower limit, and 12 is the inclined surface of the rear blade. Before the spreader finally closes, the inclined surface of the rear blade 12 gradually approaches the upper limit 10 and the lower limit 11. When the spreader finally closes, the blade and the limit are in contact, so that the rear blade 2 and the front blade 3 only move on one side and do not fold over. The same principle applies when opening, allowing the blade to unfold only on one side. Due to the limit, the blade will not open in the opposite direction.

[0027] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Those skilled in the art can make various modifications or equivalent substitutions to the present utility model within its substance and protection scope, and such modifications or equivalent substitutions should also be considered to fall within the protection scope of the present utility model's technical solution.

Claims

1. A head structure of a spreader, characterized in that: It includes a central rod (1), a rear blade (2), a front blade (3), an outer tube (4), a handle (5), a rotating wheel (6), a fixing pin (8), and a pin shaft (9); the rotating wheel (6) is located at the tail end of the handle (5); the handle (5) is fixedly provided with the outer tube (4); the central rod (1) passes through the inner cavity of the outer tube (4) and the handle (5) in sequence and is connected to the rotating wheel (6), rotating the rotating wheel (6) drives the central rod (1) to extend and retract; a pair of front blades (3) are installed at the front end of the central rod (1) through the pin shaft (9); a pair of rear blades (2) are connected at the front end of the outer tube (4) through the fixing pin (8); the rear blades (2) and the front blades (3) are connected by the pin shaft (9).

2. The head structure of the expander according to claim 1, characterized in that: The rear blade (2) and the front blade (3) are connected by a pin (9) to form two spreading arms. The central rod (1) is extended and retracted to open or close. The two spreading arms are located above and below the central rod, respectively.

3. The head structure of the expander according to claim 1, characterized in that: The central rod is provided with a central rod groove (7); the fixing pin (8) moves along the central rod groove (7).

4. The head structure of a spreader according to claim 1, characterized in that: The outer tube (4) includes a tubular structure at the rear; the front end of the tubular structure is provided with a connecting arm for connecting with the rear blade (2), and the gap between the connecting arms is used for the rear blade (2) to move when it is opened.

5. The head structure of a spreader according to claim 1, characterized in that: It also includes an upper limit position (10) and a lower limit position (11); the upper and lower surfaces of the center rod (1) are respectively provided with an upper limit position (10) and a lower limit position (11); the rear blade (2) is provided with an inclined surface (12).

Images