Clinical Study on "Pain Control of Cervical Dilation by Lidocaine Solution Injected Into a Disposable Cervical Dilator"

Summary

This study is a multicenter, randomized (each group was assigned 1:1), double-blind controlled trial.

This study aims to investigate if lidocaine injection into the single-use micro-non-invasive injection cervical dilator (short for disposable cervical dilators) leads to better pain control efficacy compared with normal saline injection in intrauterine device(short for IUD) removal surgery. Furthermore, this study aims to compare cervical dilation degree, safety, and patient satisfaction between groups.

Research objects Between August 1, 2023, and August 1, 2025, 74 healthy women who voluntarily request the removal of the intrauterine device under local anesthesia in Affiliated Hangzhou First People's Hospital, Zhejiang University School of Medicine.

The subjects will be dividied into two groups at random.

1. Trial group: disposable cervical dilator stick combined with lidocaine hydrochloride injection.
2. Control group: disposable cervical dilator stick combined with normal saline injection.

Intervention measures:

The nurse fill the syringe with 5ml of either 2% lidocaine hydrochloride injection or normal saline based on the group allocation specified. The appearance of the two drugs is indistinguishable after loading.

The subject will undergo routine disinfection and receive cervical paracervical nerve block anesthesia. After waiting for 2 minutes, the researcher gently checks the depth of the uterine cavity with a probe and then remove it. After that, the researcher tries to insert a number 10 to 4 metal Hegar dilator in sequence, until passes through the internal cervical orifice without resistance. The nurse connects the disposable cervical dilator to the syringe containing drug. The researcher inserts the disposable cervical dilator into the cervical canal in line with the probe direction, and slowly inject drug from the syringe into it within a minute. The researcher waits for another minute before removing the disposable cervical dilator. After that, the researcher tries to insert a number 10 to 4 metal Hegar dilator in sequence, until passes through the internal cervical orifice without resistance.

The researcher removes the IUD with a ring hook. If necessary, the researcher will use metal Hegar dilators to dilate cervi. The subject uses VAS to evaluate the degree of pain before, during and after surgery. Oral antibiotics were routinely given post-surgery to prevent infection.

Conditions

• Cervical Dilatations

Interventions

PROCEDURE

Disposable cervical dilator stick combined with lidocaine hydrochloride injection

The subject will undergo routine disinfection and receive cervical paracervical nerve block anesthesia (5mL of 1% lidocaine injection at the level of the bilateral sacral ligaments). After waiting for 2 minutes, the researcher gently checks the depth of the uterine cavity with a probe and then remove it. The nurse connects the disposable cervical dilator to the syringe containing lidocaine hydrochloride. The researcher inserts the disposable cervical dilator into the cervical canal in line with the probe direction, and slowly inject drug from the syringe into it within a minute. The researcher waits for another minute before removing the disposable cervical dilator. The researcher removes the IUD with a ring hook. If necessary, the researcher will use metal Hegar dilators to dilate cervix.

PROCEDURE

Disposable cervical dilator stick combined with normal saline injection

The subject will undergo routine disinfection and receive cervical paracervical nerve block anesthesia (5mL of 1% lidocaine injection at the level of the bilateral sacral ligaments). After waiting for 2 minutes, the researcher gently checks the depth of the uterine cavity with a probe and then remove it. The nurse connects the disposable cervical dilator to the syringe containing normal saline. The researcher inserts the disposable cervical dilator into the cervical canal in line with the probe direction, and slowly inject drug from the syringe into it within a minute. The researcher waits for another minute before removing the disposable cervical dilator. The researcher removes the IUD with a ring hook. If necessary, the researcher will use metal Hegar dilators to dilate cervix.

Sponsors & Collaborators

• First People's Hospital of Hangzhou

  lead OTHER

Principal Investigators

• Yahui Yahui, Yahui · Zhejiang University

Study Design

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

DOUBLE

Model

PARALLEL

Eligibility

Min Age

18 Years

Max Age

65 Years

Sex

FEMALE

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2023-07-21

Primary Completion

2025-08-31

Completion

2026-08-31

Countries

• China

Study Locations